July 2019 – Page 8 – CNC Machining & Turning, Milling, Metal parts

What are the requirements for metal cutting tools of CNC machine tools

With the development of manufacturing technology and the wide use of numerical control equipment, the progress of cutting technology has been greatly promoted. According to the requirement of process numerical control and automation, higher requirements are put forward for metal cutting tools, such as high reliability, high precision, long life, rapid displacement replacement and good chip breaking. The design of tool structure and the shape of cutting parts have become very diverse. Choosing the required cutting tools according to different characteristics is of great significance for realizing highly automatic cutting. Following is a brief introduction to the performance requirements of metal cutting tools in Yida Borun Petrochemical Company.

I. Performance Requirements of Tools

(1) Wear resistance

The metal cutting tool materials used now are different, because high-speed cutting requires tool materials with good toughness, impact resistance and wear resistance, such as polycrystalline diamond tools, which have very high wear resistance and speed.

(2) Impact resistance

In the field of metal cutting, the use of cemented carbide tools is the largest, and the common speed of metal cutting mostly uses cemented carbide tools. Cemented carbide has good impact toughness. In addition, high-speed cutting tools also have very high thermal hardness and chemical stability.

(3) Heat resistance and chemical stability

Cubic boron nitride cutters have excellent heat resistance and can cut hard materials at high temperatures, but can not be used for soft metal materials. Aluminum-based ceramics with good chemical stability are suitable for this process, but lack of hot-hardness.

(4) Service life

Coated cemented carbide cutting tools suitable for high speed cutting have wide cutting range and long service life due to the use of coating materials with good heat resistance and high hardness and multi-layer coating technology. The cutting performance of the coated cemented carbide is much better than that of the uncoated cemented carbide, so the coated cemented carbide tends to replace the common uncoated cemented carbide.

2. Material of commonly used turning tools

(1) High Speed Steel

High-speed steel, also known as front steel, is a high-alloy tool steel with tungsten, chromium, vanadium and molybdenum as the main alloying elements. High-speed steel has high flexural strength and impact toughness. It can be used for casting, forging, welding, heat treatment and cutting. It has good grinding performance and high grinding quality. Therefore, it is mostly used to manufacture tools with complex shapes, such as drills, reamers, milling cutters, etc. It is also commonly used as low-speed precision turning tools and forming turning tools.

(2) Cemented carbide

Cemented carbide is made of powder with high abrasion resistance and heat resistance, which is formed by high pressure and then sintered at high temperature. This kind of tool can be used for high-speed cutting. Its disadvantages are poor toughness and impact resistance. Cemented carbide is generally made into various shapes of blades, which can be welded or clamped on the tool body.

Selection of Special Cutting Oil

Thread cutting oil is a kind of medium which must be used in cutting technology. It mainly plays the role of lubrication, cooling and cleaning in the process.

(1) Extreme pressure and wear resistance

The special cutting oil contains sulfur extreme pressure and anti-wear additives, which can effectively protect cutting tools and improve process accuracy.

(2) Chemical stability

Compared with rapeseed oil, mechanical oil and regenerated oil, the special cutting oil has good stability and does not harm equipment, human body and environment.

(3) Other physical properties

The special cutting oil has passed strict tests in viscosity, flash point, tilt point and thermal conductivity to meet various cutting process requirements.

Detailed Explanation of Surface Treatment Technology for metal mould Castings

Surface treatment is a process of artificially forming a layer on the surface of matrix material with different mechanical, physical and chemical properties. The purpose of surface treatment is to meet the requirements of corrosion resistance, wear resistance, decoration or other special functions of products.

For metal castings, our common surface treatment methods are mechanical grinding, chemical treatment, surface heat treatment, spraying surface, surface treatment is to clean, clean, deburr, oil stain, oxide skin and so on.

In the process of processing, transportation, storage and so on, the surface of workpiece often contains oxide scale, residual sand, welding slag, dust, oil and other dirt. In order to firmly adhere to the workpiece surface, the workpiece surface must be cleaned before painting. Otherwise, it will not only affect the adhesion and corrosion resistance of the coating to the metal, but also make the base metal continue to corrode even with the protection of the coating, which will make the coating peel off and affect the mechanical properties and service life of the workpiece. Therefore, the surface treatment before painting is an important guarantee and measure to obtain high quality protective coating and prolong the service life of products.

In order to provide a good workpiece surface, the following points should be paid attention to in surface treatment:

1. No Oil Pollution and Water

2. Rust-free and oxide-free

3. Non-Adhesive Impurities

4. Residues without acid or alkali

5. Surface roughness of workpiece

Surface treatment:

Manual processing:

Such as scrapers, wire brushes or grinding wheels. Rust marks and oxide scales on the surface of workpiece can be removed by hand, but manual treatment has the advantages of high labor intensity, low production efficiency, poor quality and incomplete cleaning.

Chemical treatment:

The main purpose is to use acid-alkaline or alkaline solution to react with oxides and oil stains on the surface of workpiece and dissolve them in acidic or alkaline solution so as to remove the oxide scale and oil stains on the surface of workpiece. Then the brush roll made of nylon or 304# stainless steel wire (steel wire brush roll made of acid-alkali resistant solution) can be cleaned.

Mechanical treatment:

It mainly includes steel wire brush roller polishing method, shot blasting method and shot blasting method. The polishing method is that the brush roll is driven by the motor, and the brush roll rotates at high speed on the upper and lower surfaces of the strip in the direction opposite to the movement of the rolled piece. Scrubbed iron oxide sheet is washed out by closed circulating cooling water flushing system. Shot blasting cleaning is a method that uses centrifugal force to accelerate the projectile and eject it to the workpiece for rust removal.

Shot peening is divided into shot peening and sand blasting.

Surface treatment with shot peening has great impact and obvious cleaning effect. However, shot peening can easily deform the thin plate workpiece, and steel shot peening can strike the workpiece surface (whether shot peening or shot peening) to deform the metal base material. Because Fe304 and FE203 are not plastic, they are broken and peeled off, and the oil film is deformed with the workpiece, so shot peening and shot peening can not completely remove the oil contamination on the workpiece with oil contamination.

According to the different methods used, surface treatment technology can be divided into the following categories.

I. ELECTROCHEMICAL METHODS

This method is to use the electrode reaction to form a coating on the surface of the workpiece. The main methods are:

(1) Electroplating

In electrolyte solution, the workpiece is a cathode, under the action of external current, the process of forming coating on its surface is called electroplating. The coating can be metal, alloy, semiconductor or containing various solid particles, such as copper plating, nickel plating, etc.

(2) Oxidation

In electrolyte solution, the workpiece is an anode. Under the action of external current, the process of forming oxide film on its surface is called anodic oxidation, such as the anodic oxidation of aluminium alloy. Iron and steel can be oxidized by chemical or electrochemical methods. The chemical method is to put the workpiece into the oxidation solution and form oxide film on the workpiece surface by chemical action, such as bluing treatment of steel.

II. Chemical Methods

This method is to form a coating on the surface of the workpiece by the interaction of chemical substances without current action. The main methods are:

(1) Chemical conversion membrane treatment

In electrolyte solution, metal workpiece has no external current action, and the process of forming coating on its surface by the interaction of chemical substances and workpiece in solution is called chemical conversion film treatment. Such as metal surface bluing, phosphating, passivation, chromium salt treatment, etc.

(2) Electroless plating

In electrolyte solution, the workpiece surface is catalyzed without external current effect. In solution, due to the reduction of chemical substances, some substances are deposited on the workpiece surface to form a coating, which is called electroless plating, such as electroless nickel plating, electroless copper plating and so on.

THREE. HOT WORKING METHODS

This method is to melt or diffuse the material at high temperature to form a coating on the surface of the workpiece. Its main methods are:

(1) Hot dip plating

The process by which metal parts are put into molten metals to form coatings on their surfaces is called hot dipping, such as hot galvanizing and hot aluminizing.

(2) Thermal spraying

The process of atomizing molten metal and spraying it on the surface of workpiece to form coating is called thermal spraying, such as thermal spraying zinc, thermal spraying aluminium, etc.

(3) Hot stamping

The process of covering metal foil with temperature and pressure on the surface of workpiece to form coating layer is called hot stamping, such as hot stamping of aluminium foil.

(4) Chemical heat treatment

The process of contacting and heating a workpiece with a chemical substance and ordering an element to enter the workpiece surface at high temperature is called chemical transformation.

What habits can bring more customers to foreign trade

Customer follow-up is a hot topic for many foreign traders. Because in the process of follow-up, the customer carelessly no more information, no longer answering the phone; and the original good e-mail communication, suddenly it will sink into the sea.

It is beneficial for us to form a good habit all our lives, but it is not achieved overnight. It takes time to accumulate it slowly. There may be pain and distress in the process. What we should do is to persist and do foreign trade as well

If a foreign trader wants to do a good job in foreign trade, he must first cultivate these good habits.

Keep an eye on the market
Exchange rate, raw material prices, policy changes and so on are closely related to foreign trade, and even foreign market situation will affect export work. If you don’t know the market, foreign trade work is like crossing the river blind, the effect can be imagined.

So in the spare time of daily work, we should take the initiative to pay attention to the market situation of the industry, think and analyze more from it, and do foreign trade with thinking, you will become more and more excellent.

Inquiries are decisive and trade-offs are made
After receiving the inquiry, the first thing is to distinguish which is the real one and which is the false one, which should have a procedure to distinguish the false one. Otherwise, once the business starts, you will be submerged in the sea of e-mail.

Generally, from the content of the buyer’s inquiry, you can judge which is true and which is false. Emphasis should be placed on dealing with highly targeted e-mails that can be called inquiries.

Mail replies are concise and focused

Mail reply language should be concise, to the point, not verbose. You know, many foreign businessmen have poor patience. Even in their eyes, wasting time is tantamount to making money and killing people.

Learn from the experience of our predecessors
Foreign trade is not a sophisticated job, but it is a work of experience; if you want to do it well and become an excellent foreign trade salesman, you must learn more from the practical experience of our predecessors; success can not be replicated, but experience can be used for reference. Find customer experience, experience in sending development letters, experience in quoting prices, experience in communicating with foreigners, shipment experience, and so on. They can always play a role in guiding you to make correct decisions at a certain time.

Never underestimate the art of dealing with e-mail. Many foreign trade salesmen don’t know how to write a good e-mail. This is where inquiries are easily lost.

Professional and appropriate e-mail expression

In fact, it is very difficult to be appropriate. This article not only contains the “appropriate” factors, but also needs to be professional.

Foreign trade is a long journey, need to slowly specialize, expand, develop a good habit will make you walk more smoothly, not only foreign trade, in daily life will also benefit you for life!

Surface Processing Technology of Aluminum and Aluminum Alloys in Daily Products

Metal materials are used more and more in all kinds of existing products, because metal materials can better reflect product quality and highlight brand value. Among many metal materials, aluminium is used by various manufacturers because of its advantages of easy processing, good visual effect and rich surface treatment methods. The surface treatment of aluminium profiles is mainly divided into sand blasting (forming matte pearl silver surface) and polishing (shape). Mirror forming, wire drawing (forming a satin-like effect), electroplating (covering a layer of other metals), spraying (covering other non-metallic coatings)

Next, we will feel the surface processing technology of aluminium and aluminium alloys in our daily products.

1. Sandblasting (shot peening)

The process of cleaning and roughening metal surface by the impact of high-speed sand flow. The surface treatment of aluminium parts by this method can obtain a certain degree of cleanliness and different roughness, and improve the mechanical properties of the workpiece surface, thus improving the fatigue resistance of the workpiece, increasing the adhesion between the workpiece and the coating, prolonging the durability of the coating, and also conducive to the leveling and decoration of the coating. This process is often seen in Apple’s products, and is increasingly used in existing TV shells or midframes.

2. polishing

By means of mechanical, chemical or electrochemical methods, the surface roughness of the workpiece is reduced to obtain a bright and flat surface processing method. Polishing technology is mainly divided into: mechanical polishing, chemical polishing, electrolytic polishing. Aluminum parts with mechanical polishing and electrolytic polishing can approach the mirror effect of stainless steel, giving people a feeling of high-grade, simple, fashionable future (of course, easy to leave fingerprints but also more care).

3. wire drawing

Metal wire drawing is the process of repeatedly scraping aluminium sheet out of the line with sandpaper. Drawing can be divided into straight wire drawing, screwed wire drawing, screwed wire drawing, screwed wire drawing. Metal wire drawing process can clearly show each fine trace, so that the metal matte gloss in the exudation of fine silk luster, products both fashionable and technological sense.

4. High-light cutting

The diamond knife is strengthened on the spindle of the high-speed rotary fine-engraving machine with a fine-engraving machine to cut parts, and a local bright area is generated on the surface of the product. The brightness of cutting highlight is affected by the speed of the milling bit. The faster the bit speed is, the brighter the cutting highlight is. On the contrary, the darker the cutting highlight is and the easier the cutter grain is. In recent years, high-light milling technology has been used in some metal frames of high-end TV sets. In addition, anodic oxidation and wire drawing technology make TV sets full of fashion sense and sharp sense of science and technology.

5. Anodic oxidation

Anodic oxidation refers to the electrochemical oxidation of metals or alloys. Aluminum and its alloys form an oxide film on aluminium products (anodes) under the action of applied current under the corresponding electrolyte and specific technological conditions. Anodic oxidation can not only solve the defects of surface hardness and wear resistance of aluminium, but also prolong the service life of aluminium and enhance its beauty. It has become an indispensable part of surface treatment of aluminium. It is the most widely used and very successful process at present.

6. Bicolor Anodic Oxidation

Dual-color anodization refers to the process of anodizing a product and giving different colors to a specific area. Dual-color anodic oxidation has high cost because of its complex process, but through the contrast between the two colors, it can better reflect the high-end and unique appearance of the product.

Nine-step operation method of ultrasonic vibration screen

Many users will not operate the machine after purchasing the ultrasonic vibrating screen, the use instructions are easy to lose, resulting in the situation that the equipment can not be used. The following Dahan Machinery Technology Department sorted out the nine-step operation method of the ultrasonic vibrating screen for you. If you still can’t operate after reading, you can also click on customer service or dial the telephone to consult online. Dahan Vibration Machinery Company is very happy to serve you.~

Operating Method of Ultrasound Vibrating Screen

1. Ultrasound system should use the whole set of testing, many customers reflect that the ultrasonic system can not be used normally after overhaul. The reason is that if there is no problem after power box anti-factory testing, but the transducer has not been inspected, resulting in transducer failure, only the power box can be overhauled according to the failure to find any problems.

2. The working power supply and voltage of the ultrasonic system are 220V. The output power of the ultrasonic system is connected to the transducer by the data wire drawn from the back panel of the power box. The red is the positive pole. When connecting, special attention should be paid to the voltage pole term, so that no mistake can be made.

3. When the screening effect can be achieved, the power shield should be lowered as far as possible, and the maximum current should not exceed 0.4. Unnecessary energy consumption and unnecessary damage of power supply overcurrent should be avoided.

4. Don’t turn on the ultrasonic system when the mesh screen is not stretched. Otherwise, the transducer will be damaged because of the over-current of the power supply.

5. Screening screen tension can achieve the best screening effect, otherwise it will produce ultrasound output and vibration effect, seriously affecting the screening effect and screening output.

6. The aviation plug screw on the transducer must be tightened, and the data wire must be checked regularly for damage. The aviation joint and data wire must be wrapped with insulating tape to prevent dust. If the air plug is not tightened, the vibration wave energy of the ultrasonic vibration screen can not be transmitted. It loses its vibration effect.

7. If the material has conductivity, please keep the power box away from the material site, so as to prevent the material from entering the power box and causing short circuit.

8. If you find that the noise in the power supply is too big or the fan can’t move, please stop working immediately and check the heat dissipation fan. Please pay attention to ventilation when using power box.

9. Each set of ultrasound includes a resonant power supply, an oscillator and a grid. Number matching is better for the three, and do not mix with other ultrasonic dishes.

Design Principles of Hardware 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.

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.

Manufacturing Technology of Seamless Elbow

Seamless elbows do not cause corrosion, pitting, rust or wear. Stainless steel is also one of the most intensive building metal materials. Because stainless steel has good corrosion resistance, it can make structural parts permanent to maintain the integrity of Engineering design. The raw material for rolling seamless elbow pipe fittings is round billet. The tube embryo is cut and processed by a cutting machine to grow up to about one meter, and is heated by conveyor belt in the furnace. The billet is heated in the furnace and the temperature is about 1200 degrees Celsius. Temperature control in the furnace is a key issue. After the tube billet is discharged from the furnace, it is perforated by a pressure punch. The fuel is hydrogen or acetylene.

The common piercing machine is conical roll piercing machine. This piercing machine has high production efficiency, good product quality, large piercing diameter enlargement, and can pierce many kinds of pipe fittings. After piercing, the round tube billet is rolled by three rolls, continuous rolling or extrusion. After extrusion, the tube must be stripped and calibrated. The calibrating machine rotates into the steel embryo at high speed through the conical drill to form pipe fittings.

CNC Machining of Sheet Metal Material

With the development of society, sheet metal industry also develops rapidly. Now sheet metal involves all walks of life. For any sheet metal part, it has a certain processing process, that is, the so-called process flow. To understand the process flow of sheet metal processing, the first thing is to know the selection of sheet metal materials.

Selection of materials.

Sheet metal processing commonly used materials are cold-rolled sheet, hot-rolled sheet, galvanized sheet, brass, copper, beryllium copper, aluminum sheet, aluminum profile, stainless steel and so on. According to the different roles of products, different materials are selected. Generally, products and their uses and costs need to be considered.

1. Cold-rolled sheet: Mainly used for electroplating and paint-baking, low cost, easy to form, material thickness < 3.2mm.

2. Hot-rolled plate: material T (> 3.0mm), is also electroplated, paint parts, low cost, but difficult to form, mainly flat parts.

3. Galvanized sheet SECC, SGCC. SECC electrolytic board is divided into N material, P material and N material, which are mainly not treated by surface treatment and have high cost. P material is used for spraying parts.

4. Copper: Mainly used as conductive material. Its surface treatment is nickel plating, chromium plating, or no treatment, with high cost.

5. Aluminum plate: generally used surface chromate (J11-A), oxidation (conductive oxidation, chemical oxidation), high cost, silver plating, nickel plating.

6. Aluminum Profile: Material with complex cross-section structure, which is widely used in various kinds of boxes, and its surface treatment is the same as that of aluminium plate.

7. Stainless steel: Mainly used for no surface treatment, high cost.

2. In order to compile the technological process of the parts, the first step is to know the various technical requirements of the parts drawings, which is the most important link in the process of the parts.

1. Check whether the drawings are complete.

2. Graphic view relationship, whether the labeling is clear and complete, labeling size units;

3. Assembly relationship, key dimensions of assembly requirements;

4. The difference between old and new layout;

5. Translation of foreign pictures;

6. Code conversion at the table;

7. Feedback and burying of graphic problems;

8. Materials;

9. Quality requirements and process requirements;

10. The quality control stamp shall be affixed to the official drawing.

3. Attentions to unfolding, unfolding drawing is based on part drawing (3D) unfolding plane drawing (2D)

1. The deployment method should be in line with the requirements of material saving and processability.

2. Reasonable selection of question gap and edge-wrapping method, T=2.0 below question gap 0.2, T=2-3 question gap 0.5, edge-wrapping method using long edge wrapping short edge;

3. Rational consideration of tolerance shape size: negative difference goes to the end, positive difference goes half; hole size: positive difference goes to the end, negative difference goes half;

4. Burr direction;

5. Draw sectional views in the direction of teeth extraction, riveting, tearing, punching and convex points (bags).

6. Check material, thickness and tolerance.

7. For a special angle, the radius of the bending angle (R = 0.5) should be expanded according to the bending test.

8. Emphasis should be given to the places where mistakes are prone (similar asymmetry);

9. Enlarged maps should be added in places with larger sizes.

10. The place to be protected by spraying should be indicated.

4. The technological process of sheet metal processing may vary according to the structural differences of sheet metal parts, but generally does not exceed the following points:

1. Cutting: There are various ways of cutting, mainly the following ways

(1) Shearing machine: It is used to cut simple strip parts. It mainly prepares for blanking forming of die. It has low cost and accuracy less than 0.2, but it can only process strip or block without hole and cut angle.

(2) Punch: It is to use the punch to punch the sheet metal parts into various shapes in one or more steps. Its advantages are short time consuming, high efficiency, high precision, low cost, suitable for mass production, but the die should be designed.

NC NC blanking: NC blanking should first write NC processing program, using programming software, the drawing of the expansion diagram is compiled into NC numerical broaching machine tool recognizable program, so that according to these programs one by one, blanking flat parts of various structural shapes on the plate, but its structure is affected by the structure of the tool, low cost, accuracy is less than 0.15.

Laser cutting: Using laser cutting method, the structural shape of the plate is cut out on the large plate. Like NC cutting, it needs to write a laser program. It can cut various complex shaped plate parts with high cost and accuracy of 0.1.

Sawing Machine: Mainly used for aluminum profiles, square pipes, drawing pipes, round bars and so on, low cost, low precision.

2. Flanging: also known as punching and flanging, is to draw a slightly larger hole on a smaller base hole and tap it again. It is mainly used for sheet metal processing with thinner plate thickness to increase its strength and number of thread loops and avoid slippery teeth. It is generally used for shallow flanging with thinner plate thickness and normal hole periphery. The thickness of flanging is basically unchanged. When the thickness of flanging is allowed to become thinner by 30-40%, it can be higher than that of normal flanging. The maximum flanging height can be obtained by extruding 50% at a height of 40-60% higher. When the plate thickness is larger, such as 2.0, 2.5 or more, the plate thickness can be tapped directly.

3. Punching machine: It is the process of forming with die. Generally, punching machine processes punching, corner cutting, blanking, punching convex package, punching tearing, punching, forming and other processing methods. Its processing needs corresponding die to complete the operation, such as punching blanking die, punching blanking die, tearing die, punching die, forming die, etc. The operation mainly pays attention to location and direction.

4. Riveting: For our company, riveting mainly includes riveting nuts, screws, looseness, etc. It is through hydraulic riveting machine or punch to complete the operation, riveting it to sheet metal parts, and riveting method, need to be noted.

How to choose the electric drum

Electric drum is divided into oil-immersed electric drum and external electric drum.

Oil-immersed electric drum: Compared with the external drum, it has the advantages of compact structure, small occupied space, convenient use and maintenance, safe and reliable operation, good sealing performance, and can be applied to workplaces with high dust concentration and wet muddy, etc. It can meet various requirements of glue coating and backstop. The motor is in the cylinder, which needs to be filled with oil before using. The amount of oil injected is 1/3 of the diameter of the cylinder.

The outer-mounted electric drum motor is outside the drum. It has good heat dissipation, easy disassembly and assembly, and easy maintenance. Oil injection is required before use, and the amount of oil injection is 1/3 of the diameter of the drum.