July 2019 – Page 7 – CNC Machining & Turning, Milling, Metal parts

What are the specific technological requirements for ultra-high speed metal cutting

With the development of industry, various special engineering materials with high strength, high hardness, high temperature resistance and corrosion resistance are more and more used in metalworking industry. This puts forward higher performance indicators for the performance, spindle and structure of NC machine tools with ultra-high speed cutting and ultra-precision technology, which should be fully considered in the selection of machine tools and control systems. Following is a brief introduction to the specific requirements of high-speed cutting technology of Yida Borun Petrochemical Company.

I. Requirements for Machine Tools in High Speed Cutting

(1) The power of high-speed cutting machine tools must be large enough to meet the demand for the change of power and speed of machine tools during cutting.

(2) High-speed cutting machine tools must be equipped with compact high-speed spindle and high-speed feed screw.

(3) High-speed cutting machine tools must be equipped with solid bench, rigid gantry frame and the matrix material should have a greater effect on the structural vibration attenuation of machine tools. This structure can effectively eliminate the vibration in processing and improve the stability of machine tools.

(4) The linear motor driven directly can improve the quality and greatly simplify the structure, and it is easy to achieve high linear speed and provide constant speed, so that the workpiece can obtain the best surface quality and longer tool life.

2. Requirements for NC in High Speed Cutting

For the CNC system of high-speed cutting machine tools, there must be high-speed and high-precision interpolation system, fast response CNC system and high-precision system; there must be pre-reading, automatic angle deceleration, interpolation, which can be applied to general computer platform and other functions.

3. Requirements for Spindle in High Speed Cutting

Because of the high speed of the spindle, high requirements are put forward for the structure and bearing of the spindle in order to reduce the axial and radial circular runout of the spindle. The integral manufacturing method can greatly reduce the error of the spindle in high speed rotation. By choosing high precision bearings, the dynamic balance of the spindle can be effectively improved and the error of the workpiece can be reduced.

4. Requirements for Tools in High Speed Cutting

Tool selection is very important in high-speed cutting. Tool selection is mainly considered from two aspects: one is the dynamic balance state of the tool under high-speed rotating state, and the other is how to ensure the life of the tool.

(1) Cutting tools with dynamic balancing devices are used. Mechanical sliders or fluid dynamic balancing designs are installed in the tool sleeve.

(2) The holistic cutter is adopted, and the cutter sleeve and the cutter body are integrated to ensure that the clearance between the cutter body and the cutter sleeve is minimum in the installation process. From the overall performance, the overall tool is the most ideal in this respect.

(3) The General requirements of high-speed cutting tools are balance, advanced materials, high manufacturing accuracy, safety, easy chip removal and multi-purpose.

V. Requirements of High Speed Cutting for Parameters

When the spindle speed is fixed, first of all, attention should be paid to the control of cutting depth, including the axial cutting depth of the tool and the radial cutting depth of the tool. The control of cutting depth plays a key role in producing a qualified part and prolonging the service life of the tool. Therefore, the stable cutting depth and the width of the comparative small fluctuation range should be maintained. In general, cutting parameters should adopt higher cutting speed, less margin of finishing time, more dense tool path and smaller cutting depth in order to obtain high accuracy and reduce the roughness of the part surface.

6. Requirements for Programming in High Speed Cutting

In order to avoid the influence of machine inertia in high-speed cutting process, it is theoretically possible not to change the direction of feed in the cutting process, but in fact it is impossible to achieve this. Changing the direction of feed is unavoidable and often used, which gives programming a difficult problem. Therefore, it is necessary to select a suitable tool-walking method to solve this problem in order to generate safe, effective and accurate tool paths and ideal surface accuracy. Generally, when the knife is empty, change direction as far as possible, and reduce the feed speed before changing the feed direction. In addition, it is also very important to keep the cutting conditions as constant as possible. Because different tool loads can cause tool deviation, which will reduce the accuracy of workpiece, surface accuracy and tool life.

SELECTION OF OIL PRODUCTS IN HIGH SPEED CUTTING

The factors affecting the accuracy of ultra-high speed cutting are roughly the cutting datum, the accuracy of cutting tools, the rationality of cutting tool, the quality of workpiece raw materials, the performance of cutting oil and so on. How to select cutting oil is also an important subject in metal cutting technology.

(1) Silicon steel cutting oil

Silicon steel is a relatively easy-to-cut material. Generally, in order to make the workpiece easy to clean, low-viscosity cutting oil will be selected on the premise of preventing the occurrence of cutting burrs.

(2) Carbon steel cutting oil

When choosing cutting oil for carbon steel, the better viscosity should be determined first according to the difficulty and the method of oil feeding and degreasing conditions. Secondly, the problem of chlorine-type cutting oil rusting can be avoided by using Yida Borun sulfur-type cutting oil.

(3) Stainless steel cutting oil

Stainless steel is easy to produce hardening material, which requires cutting oil with high film strength and good sintering resistance. Cutting oil containing sulfur and chlorine compound additives is generally used to ensure extreme pressure performance and avoid burrs and tool wear.

These are the technical schemes to realize high-speed cutting technology. With the continuous development of tool technology, machine tool technology, programming technology, numerical control technology and other related technologies, high-speed cutting technology will become more and more perfect and play an increasingly important role in modern manufacturing industry.

Types and Selection of Cylinders

hat are the types of cylinders? The following is a short edition of Yushi to share with you:

(1) Actions can be divided into single-action and double-action. As shown in the structure diagram, the former can be divided into spring pressing and back pressing. It is generally used in situations with short travel, low demand for output force and motion speed (low price, low energy consumption), and double-action cylinders are more widely used. (Note: Do not equate single-acting and double-acting cylinders with or without magnetic rings).

A kind of

(2) Functionally, there are many types, such as standard cylinder, composite cylinder, special cylinder, swing cylinder, air claw, etc. Among them, freely mounted cylinder, thin cylinder, pen cylinder, double-rod cylinder, slide-table cylinder, rodless cylinder, rotary cylinder and claw cylinder are commonly used.

Classification of hardware fittings for doors and windows

There are so many kinds of hardware fittings for doors and windows. How many do you know?

There are many kinds and specifications of hardware products for door and window fittings, but hardware products play an irreplaceable role in home decoration. Choosing good hardware fittings can make many decorative materials safer and more convenient to use. At present, there are more than ten kinds of hardware products in the material market.

1, lock class

(1) external door lock; (2) handle lock; (3) drawer lock; (4) spherical door lock; (5) glass window lock; (6) electronic lock; (7) chain lock; (8) anti-theft lock; (9) bathroom lock; (10) padlock; (11) number lock; (12) lock body; (13) lock core.

2. Handles for door and window fittings

(1) drawer handle (2) cabinet door handle (3) glass door handle.

3. Hardware for door and window fittings

(1) hinge: glass hinge, corner hinge, bearing hinge (copper, steel), pipe hinge; (3) track: drawer track, sliding door track, suspension wheel, glass pulley; (4) bolt (bright and dark); (5) door suction; (6) ground suction; (7) ground spring; (8) door clamp; (9) door closer; (10) door pin; (11) door mirror; (12) anti-theft buckle; (13) pressure bar (copper, aluminium, pvc); (14) magnetic bead impact Touch beads.

Processing Technology of Hardware Package Adhesive Injection

Hardware package adhesive has the distinction between true package and false package. True encapsulation is to use the compatibility of soft glue and hard glue in softening and melting to form a layer of bonding layer on the interface between hard glue and soft glue, which greatly improves the bonding between TPE soft glue and hard plastic. False encapsulation hardly involves the compatibility of two kinds of materials. The encapsulation of materials is through mechanical force, through the design of dies and products and surface treatment, through the hoop effect, the soft glue and hard glue can be joined together.

Processing Technology of Hardware Package Adhesive Injection

Hardware package adhesive injection generally adopts secondary injection molding process, which fixes the hard plastic parts that have beer on the plastic package mould, and then injects TPE soft rubber into the hard rubber parts at the appropriate temperature, and then gets the products by cooling. The injection temperature of the adhesive-coated injection depends on the hard rubber material. Because the temperature should take into account that hard rubber and TPE soft rubber should be softened, in order to promote the two materials to achieve a certain compatibility at the contact surface. In order to achieve the effect of true encapsulation, usually the injection temperature of hardware encapsulated PP material is about 170-190 degrees Celsius; encapsulated ABS material is about 220-220 degrees Celsius; encapsulated PC material is slightly higher than that of encapsulated ABS; encapsulated PA nylon, the injection temperature is about 240 degrees Celsius.

Common metal package adhesive materials

TPE is used in adhesive-coated injection bonding. TPE soft rubber is used as the outer layer of soft rubber. The common hard materials are plastics, metals and fabrics. TPE and woven fabric jet bonding are mainly used in luggage products. Like metal bonding, TPE and woven fabric jet bonding are generally false bonding. True-encapsulated adhesives are commonly used in secondary and double-color injection moulding, that is, the main material of metal-encapsulated adhesives is plastic. TPE can adhere firmly to some common plastics such as PP, GPPS, HIPS, ABS and engineering plastics such as PC, PC/ABS, PA and their modified materials. The adhesion between TPE and POM polyformaldehyde is still a difficult problem in the elastomer industry. Because the solubility parameter SP (22.6) of POM is far different from that of TPE (7.2-7.6), the two materials are not compatible. At present, there is no suitable compatibilizer to promote the good adhesion between them in China.

Problems needing attention in adhesive injection moulding of hardware packages

1. The compatibility of TPE and hard gel structures should be matched, and the molecular solubility is close, so the molecular compatibility is better.

2. In order to ensure good contact between TPE and hard rubber parts and improve bonding effect, sharp corners should be avoided as far as possible in design.

3. To avoid the gas in the mould cavity by proper exhaust;

4. Keep the temperature of TPE melt to ensure the bonding effect.

5. Balance the thickness of TPE with the expected tactile sensation.

6. The TPE coating process needs to be baked to reduce the surface watermarks and achieve uniform surface color.

7. The carrier resin of the selected masterbatch is compatible with TPE and structural materials.

8. Special treatment should be given to smooth surfaces, with the aim of increasing the bonding contact surface between soft and hard adhesives and enhancing the bonding effect.

9. TPE should have good fluidity. Because the thickness-to-size ratio of metal cladding layer is very small, TPE usually needs to flow through a long path and thin-walled area to fill the die.

10. The flow length/product thickness ratio of TPE is less than 150:1.

What are the manufacturing process steps of precision metal stamping parts

With the development of NC stamping equipment, sheet metal stamping process is developing in a diversified direction. The punching-shearing composite process has opened up a new field, which is especially suitable for meeting the flexible requirements of small and medium batches. Punching-shearing composite process is a process that can obtain high surface roughness and high precision by one stamping stroke. It is widely used in aviation, aerospace, automobile, machinery, shipbuilding, household appliances and so on. Following is a brief introduction to the manufacturing process of stamping hardware workpiece in Baida Borun Petrochemical Company.

Stamping parts

I. Design of Stamping Parts

(1) The results of the design and implementation of stamping parts are three-dimensional entities with related concepts such as color, material, hardness, shape, size, location, related parts, manufacturing process and so on.

(2) The emergence of computer technology directly starts with the concept of three-dimensional design, which can more intuitively and accurately express all the geometric parameters of the design concept, and the whole design process can be fully discussed on the three-dimensional model.

(3) Computer technology can help stamping engineers rationalize the design process from the viewpoint of design and manufacturing, and gradually create stamping parts from the generation of sheet metal and the completion of each process.

(4) It can be seen as a virtual environment for stamping parts. Engineers can design and assemble parts directly on the computer screen. The virtual manufacturing process is almost the same as the real one.

(5) After the design of a single stamping part is completed, the three-dimensional models of multiple parts can be simulated and assembled, thus greatly shortening the design and cycle.

2. Deployment of stamping parts

After the design of stamping parts is completed, in order to facilitate manufacturing, it must be converted into an expansion drawing to determine the size of the required sheet and the shape of the sheet. (1) Computer-aided design has a small amount of operation, and the development process is completely controlled by computer.

(2) Computer aided design (CAD) has high efficiency and avoids errors that are easy to make for engineers when deploying.

(3) Computer-aided design (CAD) has high precision, and the unfolding data are completely computed by computer, thus avoiding the large grain cost of materials.

3. Selection of Stamping Oil Products

Stamping oil plays a key role in the stamping process. Good cooling performance and extreme pressure and anti-wear performance have made a qualitative leap in improving the service life of the die and the accuracy of the workpiece. Matching should be made according to the material of the workpiece.

(1) When choosing punching oil for carbon steel sheet, the better viscosity should be determined according to the process difficulty and degreasing conditions.

(2) Because of chemical reactions with chlorine additives, attention should be paid to the possibility of white rust in chlorine-type stamping oil for galvanized steel sheets when choosing stamping oil, while the rust problem can be avoided by using Yida Borun sulfur-type stamping oil, but the degreasing should be done as soon as possible after stamping.

(3) Stainless steel is a kind of material which is easy to harden. It is required to use drawing oil with high film strength and good sintering resistance. Pressing oil containing sulfur and chlorine compound additives is generally used to ensure extreme pressure performance and avoid burrs and cracks on the workpiece.

IV. Blanking of Stamping Plate

(1) Cutting of shear machine is to use the shear machine to cut out the shape, length and width of the unfolding drawing. If there is punching and cutting angle, then turn the punch press to combine with punching and cutting angle forming of the die.

(2) The blanking of punch is to punch the flat plate structure with the parts unfolded by the punch in one or more steps. Its advantage is short time-consuming and high efficiency, which is often used in batch manufacturing.

(3) NC programming is the first step in NC blanking. The unfolding drawings are compiled into identifiable contents of NC machine tools, so that they can be stamped out step by step according to these contents.

(4) Laser blanking is the use of laser cutting method, in a plate to cut out the shape of its plate structure.

5. Blanking of Machine Tool Plates

In order to meet the requirements of each process, the corresponding die is needed to complete the operation, such as the punch die, the tear forming die and so on.

6. Tapping and riveting of plate parts

Flanging is to draw a slightly larger hole into a smaller base hole and tap on it. This will increase the strength and avoid slippery teeth. Pressure riveting studs, riveting nuts, riveting screw and so on are often used in riveting. The riveting method is usually completed by punching machine or hydraulic riveting machine, which is riveted to the stamping parts.

7. Stereo Bending of Plates

Bending is a part that bends a flat plate into a body. It needs a bending machine and a corresponding bending die to complete the operation. It also has a certain order of bending, its principle is that the next knife does not interfere with the first fold, will interfere with the back fold.

VIII. Surface Treatment of Workpieces

Surface treatment generally includes phosphating skin film, electroplating multicolor zinc, chromate, baking paint, oxidation and so on. Phosphating coating is generally used for cold rolled sheets and electrolytic sheets. Its main function is to prevent oxidation by coating a protective film on the surface of the sheets; cold rolled sheets are generally used for electroplating multicolor zinc; chromate and oxidation are generally used for surface treatment of aluminium sheets and aluminium profiles.

Above is the manufacturing process of metal stamping parts. Precision metal stamping technology needs to know the parameters of machine tools and machine tools sufficiently. According to the process characteristics of CNC punch, a comprehensive analysis is made to make CNC punch get reasonable application and full play. Yida Borun is the largest production base of high-end metal processing oil in China. The independently developed stamping oil products have excellent extreme pressure and anti-wear properties.

Detection of Hardware Stamping Parts

Rockwell hardness tester is used for hardness testing of metal stamping parts. Small stamping parts with complex shapes can be used to test the plane is very small and can not be tested on ordinary desktop Rockwell hardness tester.

Stamping process includes blanking, bending, drawing, forming, finishing and other processes. Stamping materials are mainly hot-rolled or cold-rolled (mainly cold-rolled) metal strip materials, such as carbon steel plate, alloy steel plate, spring steel plate, galvanized plate, tin plate, stainless steel plate, copper and copper alloy plate, aluminum and aluminum alloy plate, etc.

PHP series portable surface Rockwell hardness tester is very suitable for testing the hardness of these stamping parts. Alloy stamping parts are the most commonly used parts in the field of metal processing and mechanical manufacturing. Stamping parts processing is a method of separating or forming metal strips by means of dies. It has a wide range of applications.

The main purpose of hardness testing of stamping materials is to determine whether the annealing degree of the purchased metal sheet is suitable for the subsequent stamping process. Different kinds of stamping process require different hardness levels of sheet metal. Aluminum alloy sheet used for stamping can be tested by Wechsler hardness tester. When the thickness of material is more than 13mm, it can be changed to Barkholder hardness tester. Pure aluminium or low hardness aluminium alloy sheet should be used Barkholder hardness tester.

In the stamping industry, stamping is sometimes called sheet metal forming, but it is slightly different. The so-called sheet metal forming refers to the forming method of using sheet metal, thin-walled tube, thin section as raw materials for plastic processing, which is collectively called sheet metal forming. At this time, the deformation in the direction of thick plate is generally not taken into account.

Steps and Classificatio of Metal Processing

Hardware processing

Hardware processing is the raw materials (stainless steel, copper, aluminum, iron). Machines such as lathes, milling machines, drilling machines, polishing machines and so on are used to process various parts according to customers’drawings or samples, such as screw, motor shaft, model car parts, fishing gear accessories, speaker product shells, mobile power supply shells, etc.

Technological process

Hardware processing process is based on the production needs of raw materials, after a good start, some such as small parts production can go to the punch and then Gong cutting or CNC processing, which in the production of glasses accessories, automotive parts, many aspects. To make containers: it is to burn and weld after punching, then sand and spray oil, and then assemble accessories to ship. And for hardware accessories, there are many polished surfaces, plating or spraying oil. Then welding or screwing assembly packaging shipment

Operation steps

1. Before entering the post, all employees should check whether their clothes meet the requirements of the work. Slippers, high heels and clothing that affect safety are not allowed to wear. Safety hats should be worn for long hair. Maintain the correct posture while working, and have enough spirit to deal with the work. If you find that you are not well, you should leave the job immediately and report to the leader. When operating, we must concentrate our thoughts, strictly prohibit chatting and cooperate with each other. Operators should not operate in a state of irritability and fatigue, so as to avoid accidents and ensure safe operation.

2. Check whether the moving part is filled with lubricant before the machine works, then start and check whether the clutch and brake are normal, and run the machine for 1-3 minutes empty. Operations are strictly prohibited when the machine is in trouble.

3. When replacing the die, first turn off the power supply. After the movement Department of the punch stops running, the die can be installed and debugged. After installation and adjustment, the flywheel is tested twice by hand to check whether the upper and lower dies are symmetrical and reasonable, whether the screw is firm, and whether the blank holder ring is in a reasonable position.

4. Power-on mechanism can only be activated when all other personnel leave the mechanical work area and take away the debris on the worktable.

5. When the machine is started, one person will transport materials and operate the machine. Others may not press the power or foot to step on the switch board, let alone put their hands in the working area of the machine or touch the moving part of the machine with their hands. When the machine works, it is forbidden to extend the hand into the slider working area, and to take and place the workpiece by hand. Standard tools must be used when drawing and placing workpieces in the die. If abnormal sound or machine failure is found, the power switch should be switched off immediately for inspection.

6. When you leave work, you should turn off the idle power supply, and tidy up the finished products, materials and sundries on the post, so as to ensure the clean and safe working environment.

The above operating rules must be consciously observed, not to violate the rules of operation, failure, should cooperate with maintenance personnel to repair, immediately cut off the power supply when an accident occurs, keep on-site report to the factory until it is dealt with, and all consequences caused by violation of the operating rules shall be borne by the parties concerned.

classification

Hardware surface processing subdivision can be divided into: metal spray painting processing, electroplating, surface polishing processing, metal corrosion processing and so on.

Hardware parts surface processing:

1. Spray-paint processing: Hardware factories use spray-paint processing in the production of large pieces of hardware products, through spray-paint processing to avoid rust of hardware, such as daily necessities, electrical shell, handicraft, etc.

2. Electroplating: Electroplating is also the most common processing technology for hardware processing. By electroplating on the surface of hardware parts through modern technology, it ensures that the products will not be mildewed and embroidered for a long time. Common electroplating processes include screw, stamping parts, batteries, car parts, trinkets, etc.

3. Surface polishing: Surface polishing is generally used in daily necessities. For example, we produce a comb, which is made of stamped hardware. Then the edges of the stamped comb are very sharp. We need to throw the sharp edges into a smooth face by polishing, so that in the process of using it, we can not. Can cause harm to human body.

Turning round surface is the basic method of metal processing, and the equipment used is lathe. In general machinery factories, lathes account for about 40% of the total number of machine tools. Turning is the main method of roughing and semi-finishing all kinds of materials, and also the final finishing method of all kinds of materials which are not suitable for grinding.

In small batch production of single piece, turning cylindrical surface is usually carried out on ordinary lathes. In mass production, multi-tool semi-automatic lathes or automatic lathes are widely used. Large disc parts should be processed on vertical lathes. Large long axle parts need to be processed on heavy horizontal lathe.

The characteristics of turning cylindrical surface are as follows: 1. The tool is simple, the manufacture is convenient, the grinding and installation are convenient; 2. The cutting process is smooth, the cutting force fluctuation is small, which is conducive to the adoption of high cutting speed and the improvement of productivity; 3. The machine tool has good versatility and can process the cylindrical surface, end face, inner hole, thread and chamfer in one clamp. The accuracy of each surface position is easy to guarantee; 4. Suitable for finishing non-ferrous metal parts.

Design of metal Stamping Parts

(1) The stamping parts designed must meet the requirements of product usage and technical performance, and can be easily assembled and repaired.

(2) The stamping parts designed must be conducive to improving the utilization rate of metal materials, reducing the variety and specifications of materials, and reducing the consumption of materials as much as possible. In the case of permissible use of low-cost materials, as far as possible to make parts without waste and less waste blanking.

(3) The stamping parts designed must be simple in shape and reasonable in structure, so as to simplify the die structure and the number of working procedures, that is, to complete the whole part processing with the least and simplest stamping process, reduce the re-processing by other methods, and be conducive to stamping operation, facilitate the organization of mechanized and automated production, and improve labor productivity.

_The stamping parts designed in this paper, in order to ensure the normal use of the stamping parts, try to make the size accuracy and surface roughness level requirements lower, and is conducive to product interchange, reduce waste products and ensure product quality stability.

(5) The stamping parts designed should be conducive to the use of existing equipment, process equipment and process flow as far as possible, and to the extension of the service life of the die.

Ten kinds of salesmen are easy to be eliminated

1. Salesmen who always fail to achieve their goals are easily eliminated.

It is not necessarily the salesman who fails to achieve the goal. However, a salesman who always fails to achieve his goals, no matter how many problems the enterprise has, such salesman will become the first object to be eliminated, because the managers of the enterprise will think that: the enterprise has too many salesmen who fail to achieve the goals like you, so the performance of the enterprise is problematic; besides, the enterprise can not always achieve the goals, and the enterprise can not afford you.

2. Salesmen who are complained by distributors are easily eliminated

Most enterprises pay more attention to dealers than salesmen. As a salesman said, when a dealer needs to be cut off, the managers of the enterprise may not attach importance to and agree with it; when a dealer complains about a salesman, the managers of the enterprise may not immediately hit the salesman, or even directly hit the salesman with the word ________

3. Businessmen who just talk and don’t play tricks are easy to be eliminated.

The “old man” who has been doing business for several years will become an “old stick”. It was not long before the first three axes accumulated could not be found. This kind of empty-handed salesman is not popular in old and new enterprises.

4. Salesmen who like to confront their superiors are easily eliminated

No matter how bad the supervisor is, as long as it’s your supervisor, at least it shows that he’s better than you in some ways. If you like to confront your superiors, it means that you expose and magnify your shortcomings without seeing their strengths and strengths. Can you still “fool” under your superiors? Quick go, you will be expelled if you don’t leave.

5. Self-righteous and self-righteous salesmen are easily eliminated

Some business people start to think that they are great after they have achieved little. They don’t follow the company’s established strategies and plans, and they believe that they are in control. With their achievements, the leaders will think that you are not obedient to management and that something is wrong, which just makes you “go to hell”.

6. Complaining and complaining salesmen are easily eliminated

In business meetings, there are always several salesmen complaining about poor product quality, high prices, small promotions, less advertising, heavy tasks and so on. Within two months, such salesmen “went to one side to cool down”. What enterprises need is elites who can solve practical problems, not “observers”.

7. Businessmen who are jealous of virtue and ability are easily eliminated

Their own poor performance, look at others’good performance on the “red eye”: fleeing goods, smashing prices, looking for a few buddies “rumor” him and so on. When the truth is in front of us, we have to leave a good example to learn.

8. Self-promotion salesmen are easily eliminated

Some salesmen like to publicize themselves on the Internet or in some public places after they have made some achievements, and put their achievements in their pockets. As everyone knows, the performance of a market is created by many departments and personnel. Without the systematic support of the platform, the strength of individual business personnel is extremely limited.

9. Fake salesmen are easily eliminated during business trips

Some salesmen take advantage of the loopholes in business management. First, they cheat on business trips, and second, they cheat on business tickets, and the money they don’t spend turns into so much money. Once a salesman has formed such bad habits, it is difficult to get rid of them easily. However, “often walk by the river, where there are no wet shoes”, once found by business managers, only fall into the river.

10. Unconstrained private life is easy to be eliminated

Due to long-term outside, far away from the management and supervision of enterprises and families, a considerable number of salesmen will become unrestrained in their private life. Once corrupted, such salesmen can not cultivate the market like “old scalpers”. Only after “soaking in bars, building the Great Wall, washing saunas, looking for massage” and other songs and dances are leveled, the smoke disappears.

Introduction of metal Stamping Industry

Stamping industry is an industry involving a wide range of fields. It goes deep into all aspects of manufacturing industry. Stamping is called sheet metal forming abroad. This is also called in our country. What is China’s stamping industry like, what is foreign, how we go, this is our concern for the country.

The rapid development of stamping is attributed to the development of automobiles, aircraft and household appliances.