Regardless of whether the manufacturer maintains and maintains the machinery after-sales, whether it is new or old customers, they must pay attention to the maintenance and maintenance of the equipment. No matter how good the equipment does not know how to maintain and repair, the life of the equipment will never be large.
This is the first stage of troubleshooting and is a very critical stage. The main tasks should be as follows:
1 Inquiring into the investigation When receiving the information on the machine site where the fault is required to be eliminated, the operator should first be required to maintain the on-site fault state as much as possible, without any treatment, which is beneficial to quickly and accurately analyze the cause of the fault. At the same time, carefully inquire about the fault indication situation, the fault appearance and the background of the fault, and make a preliminary judgment in order to determine the tools, instruments, drawings and materials, spare parts, etc. that should be carried on the site to reduce the round-trip time.
2 On-site inspection After arriving at the scene, first verify the accuracy and completeness of the various conditions provided by the operator to verify the accuracy of the preliminary judgment. Due to the level of the operator, there are many cases where the fault condition is unclear or even completely inaccurate. Therefore, after going to the scene, do not rush to handle it, and re-examine the situation carefully to avoid damage to the scene and increase the difficulty of troubleshooting.
3 Fault Analysis According to the known fault conditions, the fault classification is analyzed according to the fault classification method described in the previous section to determine the troubleshooting principle. Since most faults are indicated, in general, the CNC machining system diagnostic manual and instruction manual for the machine tool can be used to list the various possible causes of the fault.
4 Determining the cause Check the various possible causes to find out the real cause of the fault. At this time, the maintenance personnel is a comprehensive test of the familiarity, knowledge level, practical experience and analytical judgment of the machine.
5 troubleshooting methods for troubleshooting may be very simple, some faults are often complicated, and a series of preparations are needed, such as preparation of tools and meters, partial disassembly, repair of components, procurement of components, and even platooning. Therefore, the formulation of the planning steps and so on.
Mechanical maintenance
The role of the winder before the cloth is cut into bundles
The winder is a part of the whole set of stripping machine, its main function is to take up the fabric. So what is the role of this machine in the whole process? What effect does it have on subsequent cuts? This is the topic we are going to discuss today.
China is a big garment manufacturer and uses a lot of fabric every year. Therefore, the demand on the finishing machine of the fabric is very large, and the winder is a machine for taking up the fabric. It can make the fabric easy to store, and it can also be applied to other aspects, such as the winding of the fabric at different angles in the packaging, or the winding of the fabric for subsequent cutting, etc. . Today we mainly talk about the application of the winder to take up the fabric.
The main function of the rolling machine in cutting the bundle is that the winding machine can roll the cloth neatly, so that the cloth can reduce the cutting distance when cutting the strip, and can make the cutting without deviation, which is beneficial to the cutting. Moreover, the fully automatic winder is equipped with a coder that records the length of the take-up fabric and the speed of the take-up.
Therefore, the winder is very important when cutting the bundle of cloth, which makes the cloth automatic and convenient in cutting the bundle. Therefore, the winder is a very important equipment in the clothing industry and is a must-have device.
Precision CNC machining of those things
Precision CNC machining of those things
CNC precision machining refers to the high precision marked on the production and processing drawings, which requires the completion of precision machining equipment.
The ultra-precision processing equipment of mechanical processing manufacturers mainly include: CNC machining center, precision grinding machine and CNC lathe; CNC machining center has high precision, high precision, complex type, small batch parts processing has unique advantages; precision grinding machine belongs to precision processing equipment One is mainly the finishing, mainly for the processing of quenched parts; the CNC lathe is also an automatic processing equipment, and the general shaft, rod and round type parts are processed, which has advantages for special precision requirements or small batch parts processing.
A, CNC processing technology and working principle
1. Division of process and work steps; determination of tool points and tool change points;
2. Determination of processing route; selection of processing method and determination of processing plan.
3, the reasonable selection of machine tools, the choice of different parts of the accuracy of the workpiece;
4. Installation of parts and selection of fixtures;
5. The selection of the tool and the determination of the cutting amount;
6. Process analysis of CNC machining parts and reasonable processing technology.
B, the correct operation method of CNC precision machining
First, the geometric information and process information on the CNC machined part drawing are digitized, that is, the relative movement path of the tool and the workpiece, the change of the spindle speed and the feed speed during the CNC machining, the switch of the coolant, the transformation of the workpiece and the tool, etc. And the operation, the machining program is programmed according to the specified code and format, and then the program is input into the numerical control system.
The numerical control system first performs corresponding calculations and processing according to the requirements of the program, and then issues control commands to coordinate the coordinate axes, the main shafts and the auxiliary actions to realize the relative movement of the tool and the workpiece, and automatically complete the machining of the parts.
C, the accuracy of CNC machine tools choose to consider those factors
The precision of CNC machine tools and the precision of machining process are different. They represent the two different concepts of CNC machine tools. One is the machine’s own precision and the other is the process precision it processes. These two reasons seem to be irrelevant, but they are also related.
It is wrong to regard the positional accuracy on the manufacturer’s sample or on the product certificate as the machining accuracy of the machine tool. The positional accuracy indicated on the sample or certificate is the accuracy of the machine itself, and the machining accuracy is the sum of the errors produced by various factors of the entire process system, including the tolerances allowed by the machine itself. When selecting the type, the evaluation method of the process capability kp can be referred to as the basis for selecting the accuracy.
CNC accuracy has a significant impact on the quality of the process. It is important to note that machining accuracy and machine accuracy are two different concepts. The rigidity of the machine tool directly affects the productivity and machining accuracy. The machining speed of the machining center is much higher than that of the ordinary machine tool, and the motor power is also higher than that of the ordinary machine tool of the same specification. Therefore, the rigidity of the structural design is much higher than that of the ordinary machine tool. When ordering, the process requirements, allowable torque, power, axial force and maximum feed force can be checked according to the values provided by the manufacturer.
D, how to maintain the high strength of parts in precision parts processing
The principle measures for improving the strength of parts are: using high-strength materials, heat-treating materials to improve strength and reducing internal stress, controlling the processing to reduce or eliminate micro-defects, etc.; trying to reduce the load on the parts; increasing the dangerous section of the parts The size of the section is reasonably designed to increase the moment of inertia of the section; the structure of the part is properly involved to reduce the concentration of stress.
CNC precision parts processing can be multi-coordinate linkage, can process parts with complex shapes; high processing precision and stable processing quality; mass production, product quality is easy to control; when machining parts change, generally only need to change the NC program, Save production preparation time; the machine itself has high precision and rigidity, can choose favorable processing quantity, high productivity (usually 3~5 times of ordinary machine tools); high degree of machine automation, can reduce labor intensity; professional for operators The quality requirements are lower, and the technical requirements for maintenance personnel are higher.
Gear pump test plan
The reliability test includes two methods, the test room and the site. The test can be carried out according to the specific conditions.
Complete sample test—test is carried out until each test pump reaches the service life.
Incomplete sample test:
(1) Timing censoring test—-The test is stopped when the test is carried out until the test time T* specified before the test.
When the sample size is large, especially in laboratory tests, a timing censor test protocol can be used.
(2) Fixed-end censoring test—-test The test is carried out when the number of failures specified before the test is stopped.
When the user limits the number of pump failures, a fixed censoring test scheme can be used.
Trolley caster installation tips
The trolley is a common handling tool for our daily production and life. It is divided into a wheelbarrow, a two-wheeled trolley, a three-wheeled trolley and a four-wheeled trolley according to the number of casters. Among them, the four-wheel plastic flat trolley has a wide range of use and is relatively simple to operate.
How do we properly install the cart casters when installing or replacing such four-wheel plastic flat cart casters?
First, according to the approved load of the trolley, the load of the plastic flatbed trolley is less than 300 kg, so the single wheel load of the caster can be about 100 kg. It is recommended to use a 4 inch or more caster, because the larger the wheel, the easier it is to push.
Second, according to the use of the trolley, if it is a quiet place in the floor paint workshop, electronic workshop or hotel, it is recommended to use a caster with a mute effect such as TPR or polyurethane.
Third, in the case of satisfying the above two conditions, it is necessary to confirm whether the mounting hole distance of the caster is the same as the mounting hole distance on the plastic flatbed. Because the installation pitch of conventional medium-sized casters on the market is 74mm*45mm, the mounting pitch of such plastic flatbeds is generally 84mm*71mm. If the medium-sized casters do not find a suitable mounting hole, they can also be replaced directly with heavy-duty casters, because the mounting pitch of heavy-duty casters is the same as the mounting hole of this plastic flatbed, but the price of heavy-duty casters is more expensive than that of medium-sized casters. Some, but the quality is much better.
Fourth, when installing such a caster caster, it is recommended to use two directional wheels with two universal wheels, and the universal wheel should be installed on the side close to the handle. This method of installation is better at controlling the direction of the cart.
Which is better for sliding door pulleys
Which is better for sliding door pulleys?
Sliding doors, we all know that it is more decorative than traditional doors, and many people will use them in small spaces such as kitchens or bathrooms, not occupying an inch of space.
However, many people have forgotten the importance of the pulley when they installed it, only to care about the beauty of the door. So is the pulley made of stainless steel or plastic? The master thinks that the sliding door pulley is still not good for buying plastic. It is actually a display.
Sliding doors are not only the decorative nature of the door, but also the quality of its hardware, including the important pulleys. At present, the pulleys on the market are roughly classified into three kinds of materials: plastic, metal, and glass fiber, and many of them are stainless steel machining.
Hardware application
Auxiliary, accessory finished products used in daily life and industrial production. In the early days, it was made of metal materials such as gold, silver, copper, iron and tin, hence the name.
Hardware
In addition to the use of various metal materials, it is also widely used in non-metallic materials such as plastics and glass fibers. Hardware products have played an important role in the survival and development of human beings. With the development of social economy and the refinement of social division of labor, hardware products are gradually enriched and improved, and more and more varieties. Modern hardware products can be divided into three categories according to their purposes: daily hardware for daily life, hand tools for production and living aids, construction of joints, fasteners and supporting facilities in buildings and structures. Hardware. Metal materials are generally made by forging blanks, cnc machining, surface treatment and other processes. The purpose of surface treatment is to prevent corrosion and aesthetics. Non-metallic materials are mostly molded or pressure molded, which is light and convenient.
Mold performance
1. Low density: The low density of plastics is of great significance for reducing the weight and energy saving of mechanical equipment, especially for vehicles, ships, aircraft, and spacecraft.
2. Specific strength and specific stiffness: The absolute strength of plastic is not as high as that of metal, but the density of plastic is small, so the specific strength (σb/ρ) and specific stiffness (E/ρ) are quite high. In particular, reinforced plastics made of various high-strength fibrous, flake and powdery metals or non-metal fillers have higher specific strength and specific stiffness than metals.
3. Good chemical stability: Most plastics have good acid, alkali, salt, water and gas properties. Under normal conditions, they do not chemically react with these substances.
4. Electrical insulation, heat insulation and sound insulation performance are good.
5. Good wear resistance and self-lubricating property: plastic has small friction coefficient, good wear resistance, good self-lubricating property, high specific strength and low transmission noise. It can be used in liquid medium, semi-dry or even dry friction. Work effectively under conditions. It can be made into machine parts such as bearings, gears, cams and pulleys, which is very suitable for occasions where the speed is not high and the load is not large.
6. Strong bonding ability.
7. Good molding and coloring performance.
Do you know what different tool holders are available in CNC machining centers
What does 7:24 in the BT holder mean?
What are the standards for BT, NT, JT, IT, and CAT?
CNC machine tools are now widely used in factories. These machines and tools come from all over the world and come in different models and standards. Talk to everyone today about the machining center tool holder.
The shank is the connection between the machine tool and the tool. The shank is a key link that affects the concentricity and dynamic balance. You should never treat it as a general part. The concentricity determines whether the cutting amount of each cutting edge portion is uniform when the tool rotates one revolution; the dynamic unbalance will produce periodic vibration when the spindle rotates.
1 according to the spindle cone hole divided into two categories
The taper of the tool hole according to the machining center spindle is usually divided into two categories:
SK universal shank with a taper of 7:24
HSK vacuum shank with a taper of 1:10
SK SK universal shank with a taper of 7:24
7:24 means that the taper of the shank is 7:24, which is a separate cone positioning, and the taper shank is longer. The cone surface also plays two important roles at the same time, namely the precise positioning of the shank relative to the spindle and the clamping of the shank.
ŸAdvantages: It can realize fast loading and unloading of tools without self-locking; the manufacturing of the tool holder can ensure the accuracy of the connection by processing the taper angle to high precision, so the cost of the tool holder is relatively low.
Disadvantages: At the high speed rotation, the taper hole at the front end of the spindle will expand. The amount of expansion increases with the increase of the radius of rotation and the rotation speed. The stiffness of the taper connection will decrease. Under the action of the tension of the tie rod, the axial displacement of the shank There will also be changes. The radial dimension of the shank changes after each tool change, and there is a problem that the repeat positioning accuracy is unstable.
Universal shanks with a 7:24 taper typically have five standards and specifications:
1. International Standard IS0 7388/1 (referred to as IV or IT)
2. Japanese Standard MAS BT (BT for short)
3. German standard DIN 2080 (referred to as NT or ST)
4. American Standard ANSI/ASME (CAT)
5. DIN 69871 (JT, DIN, DAT or DV for short)
Tightening method:
The NT type shank is used to tighten the shank by a tie rod on a conventional machine tool. It is also called ST in China. The other four shanks are used to tighten the shank on the machining center through the shank of the shank
Generality:
1) At present, the most used in the country are the DIN 69871 (ie JT) and Japan MAS BT type handles;
2) The shank of the DIN 69871 can also be mounted on a machine with an ANSI/ASME spindle taper;
3) The international standard IS0 7388/1 tool holder can also be mounted on the DIN 69871, ANSI/ASME spindle taper machine, so the ISO 7038/1 tool holder is the most versatile.
HS HSK vacuum shank with a taper of 1:10
The HSK vacuum shank is elastically deformed by the shank, not only the 1:10 taper surface of the shank is in contact with the 1:10 taper surface of the machine tool spindle hole, but also the flange surface of the shank is in close contact with the main shaft surface. The surface contact system is superior to the 7:24 universal tool holder for high speed machining, joint rigidity and coincidence accuracy.
HSK vacuum shank can improve the rigidity and stability of the system and the precision of the product during high-speed machining, and shorten the tool replacement time. It plays an important role in high-speed machining, and it adapts to the spindle speed of the machine to 60,000 rpm. HSK tool systems are being widely used in aerospace, automotive, precision mold and other manufacturing industries.
HSK holders are available in A, B, C, D, E, and F types, among which A, E, and F are commonly used in machining centers (automatic tool change).
The biggest difference between type A and type E:
1. Type A has a transmission slot and E does not. Therefore, the A-type transmission torque is relatively large, and relatively heavy cutting can be performed. The E-type transmission torque is relatively small, and only some light cutting can be performed.
2. In addition to the transmission groove, the A-type holder has manual fixing holes, direction grooves, etc., so the balance is relatively poor. The E type is not available, so the E type is more suitable for high speed machining. The E-type and F-type mechanisms are identical. The difference is that the E-type and F-type shanks (such as E63 and F63) are also called, and the taper of the F-type shank is smaller. That is to say, the flange diameters of E63 and F63 are both φ63, but the taper size of F63 is only the same as that of E50. So compared to the E63, the F63 will spin faster (small spindle bearings).
2 shank loading form
spring collet handle
It is mainly used for the clamping of straight shank tools and tools such as drills, milling cutters and taps. The elastic deformation of the circlip is 1mm, and the clamping range is 0.5~32mm.
Hydraulic chuck
A- locking screw, use an Allen key to tighten the locking screw;
B- lock the piston and press the hydraulic medium into the expansion chamber;
C- expansion chamber, compressed by liquid to generate pressure;
D- Thin expansion bushing that positions and evenly envelops the center of the tool holder during locking.
E- Special seals ensure an ideal seal and long service life.
Heating the handle
Inductive heating is used to heat the tool holder on the shank so that its diameter expands and the cold shank is placed in the hot shank. The heating shank has large clamping force and good dynamic balance, which is suitable for high speed machining. The repeating positioning accuracy is high, generally within 2μm, and the radial runout is within 5μm; the anti-fouling ability is good, and the anti-interference ability is good in processing. However, each type of tool holder is only suitable for a tool with a shank diameter and a heating device is required.
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