Category Archive Machinery industry

In the process of processing, there will be many factors affecting our processing effect, but with the development of our science and technology, now there are many problems can be easily solved. In the industrial industry, our hardware processing application is very extensive, at the same time, there are many fault problems, but if we want to solve the problem, we must first find the cause of the problem What is the reason, so let’s understand what causes the precision of precision hardware processing to become worse?

1. The machining accuracy of parts is poor. Generally speaking, if the dynamic error between shafts is not adjusted properly or the shaft drive chain changes due to wear, the accuracy of parts will be affected. Generally speaking, the accuracy caused by the error of this type can be adjusted again. And if the error is too large to alarm, it is necessary to check the servo motor to see if its speed is too high.
2. When the machine tool is running, the overshoot will also affect the processing accuracy, which may be due to the short acceleration and deceleration time, and appropriately extending the change time. Of course, it is also very likely that the link between the lead screw and the servo motor is loose.
3. Due to the roundness out of tolerance caused by the linkage of two shafts, the axial deformation of the circle formed by mechanical adjustment, the gap compensation of the shaft lead screw is not correct, or the shaft positioning occurs offset, which may affect the precision of fine parts.

In the processing engineering, we will encounter a variety of problems, which must be solved as soon as possible, otherwise it will affect our work, so it is not good, some problems will also affect the quality of processing, not hit the mold damage and so on, so we will understand how to prevent the phenomenon of gnawing die in the stamping process?

(1) In terms of design and equipment, if the punch is not fixed properly, such as fixing the punch by chiseling, the punch may become loose. If the low melting point alloy is used for pouring, the punch may become loose. If the blanking force is large and the root of punch is not hardened and the punch is subjected to excessive lateral force, the punch may become loose.

(2) Mold manufacturing

1. Vertical or no punch mounting.
2. The assembly of upper and lower templates, fixed plates, convex and concave dies are not parallel to each other.
3. The blanking clearance is not uniform.
4. The punch fixation did not meet the design requirements.

(3) Mold use

1. Repeated blanking or overlapping blanking, that is, one blank is punched twice or several blanks are stacked together for blanking.
2. The scraps or blanking parts left on the mould are not cleaned in time.

(4) Mold maintenance

1. The parts of the die have great wear, such as the guide parts wear, resulting in excessive fit clearance and not timely repair.
2. The mold is loose in maintenance and assembly.

The above points are how to prevent the phenomenon of gnawing die in the process of stamping. When dealing with the problems, we must pay attention to some details to avoid causing greater hidden dangers. Let’s talk about it today. If you want to know more information, please visit Dongguan machining website for details.

No matter what kind of work, there will be some problems in the process. These problems are not big, but they will affect our work efficiency and product quality. So we not only need to solve the problems in time, but also learn how to prevent the occurrence of faults. Next, we will learn how to prevent the deformation of workpiece in the machining process of Dongguan?

The deformation is directly proportional to the shape complexity, length width ratio and wall thickness, and is directly proportional to the rigidity and stability of the material. Therefore, the influence of these factors on workpiece deformation should be reduced as much as possible when designing parts. Especially in the structure of large parts, the structure should be reasonable. Before processing, the hardness and porosity of the blank should be strictly controlled to ensure the quality of the blank and reduce the deformation of the workpiece.

When the workpiece is clamped, the correct clamping point should be selected first, and then the appropriate clamping force should be selected according to the position of the clamping point. Therefore, the clamping point should be consistent with the support point as much as possible, so that the clamping force acts on the support. The clamping point should be as close to the machining surface as possible, and the position where the force is not easy to cause clamping deformation is selected.

Dongguan machining

When there are several directions of clamping force acting on the workpiece, the order of clamping force should be considered. For contacting the workpiece with the support, the clamping force should act first, and it is not easy to be too large. For the main clamping force balancing the cutting force, the stress acts on the last. Secondly, the contact area between workpiece and fixture should be increased or axial clamping force should be used. Increasing the rigidity of parts is an effective way to solve the problem of clamping deformation. However, due to the shape and structure characteristics of thin-walled parts, it has low rigidity. In this way, under the action of clamping force, deformation will occur.

Increasing the contact area between workpiece and fixture can effectively reduce the deformation of workpiece during clamping. For example, when milling thin-walled parts, a large number of elastic pressing plates are used to increase the stress area of the contact parts; when turning the inner diameter and outer circle of the thin-walled sleeve, whether using simple opening transition ring, or using elastic mandrel, whole arc claw, etc., the contact area of workpiece clamping is increased. This method is beneficial to carrying the clamping force and avoiding the deformation of parts. The use of axial clamping force is also widely used in production. The design and manufacture of special fixture can make the clamping force act on the end face, which can solve the bending deformation of workpiece caused by thin wall and poor rigidity.

With the development of our country, now people’s living conditions are more and more superior, people’s requirements for more quality of life have also been improving, of course, with the improvement of our work standards, in fact, no matter what industry, in this society, is always in progress, if the world of the jungle, if not progress, it will certainly be eliminated, so below Let’s learn about the standard of non-standard parts processing?

The first is to take the cylinder as an example: for example, the cylinder diameter has strict requirements, and the positive and negative errors are within the required qualified parts range, otherwise, they are all unqualified parts; if the diameter of the embedded cylinder is too large and exceeds the allowable error range, the actual diameter will be too small and exceed the lower limit of allowable negative error value, which will lead to too loose insertion. There are problems of instability.

Second, these are not qualified products, or the cylinder length is too long or too short, exceeding the allowable error, are all unqualified products, which will inevitably lead to increased costs.

The third and second is the advanced non-standard precision parts processing equipment and testing equipment, advanced processing equipment makes the precision parts processing easier, higher precision and better effect.

In the process of hardware processing, we will use a lot of different things, because we want to do a good product is to pay attention to some details of the problem, so that we can make better quality products, so let’s learn about Dongguan Hardware processing using cutting fluid to pay attention to what matters?

(1) the cutting fluid shall be free from irritating smell and additives harmful to human body, so as to ensure the safety of users.

(2) the cutting fluid shall meet the requirements of equipment lubrication and protection management, that is, the cutting fluid shall not corrode the metal parts of the machine tool, damage the seal and paint of the machine tool, and shall not leave hard colloidal deposits on the guide rail of the machine tool, so as to ensure the safety and normal operation of the equipment

(3) the cutting fluid should ensure the anti rust oil effect between the working procedures of the workpiece and not rust the workpiece. When processing copper alloy, the cutting fluid containing sulfur should not be selected. The pH value of cutting fluid should be neutral when processing aluminum alloy.

(4) the cutting fluid should have excellent lubricating and cleaning properties. The cutting fluid with high Pb value and low surface tension is selected, and the cutting test shows that the cutting effect is good.

(5) The cutting fluid should have a long service life, and the machining center is particularly important.

(6) the cutting fluid should adapt to a variety of processing methods and workpiece materials.

(7) the cutting fluid should have low pollution and waste liquid treatment method.

(8) cutting fluid should be suitable in price and convenient in preparation. In conclusion, when selecting cutting fluid, users can select 2-3 kinds of cutting fluid with better comprehensive performance according to specific processing conditions. After trial use in the factory, the cutting fluid with proper performance can be determined

In fact, no matter what is processed, there are matters needing attention, so as to ensure the quality of the products we produce. However, compared with large parts, processing is still relatively difficult, so there are many matters needing attention. So let’s learn about the matters needing attention in machining large parts?

1. Large and medium-sized parts should be equipped with protective equipment before machining, and rubber gloves and necks are strictly prohibited. Before starting the CNC lathe, it is necessary to understand the main purpose and operation steps of each rocker, and check whether all positions of the CNC lathe are running normally. Before starting the CNC lathe, it is necessary to clamp the NC blade and steel parts with a wrench.
2. It is forbidden to start the CNC lathe for machining large and medium-sized parts without the permission of the staff. It is not allowed to touch the running position in the process of speed regulation, chip removal or area measurement before starting. If dirt or cutting is found on the CNC lathe, it is forbidden to take it by hand or blow with mouth.
3. During the machining of large and medium-sized parts, if it is found that the articles are loose or the machine equipment is abnormal, the car must be parked immediately. After the actual operation, the special tools should be removed and the working environment of the CNC lathe should be cleaned. It is not necessary to put the CNC blade, steel parts and other objects on the surface of the machine tool workbench.
4. It is not allowed to touch the CNC blade, steel parts and its running components with hands in the machining of large and medium-sized parts. It is forbidden to lean the human body on the CNC lathe to prevent other safety accidents. When two people operate each equipment together, the division of responsibilities shall be established and close cooperation shall be established.
5. About 40% of the gear transmission noise is caused by rough edges and bumps. Some processing plants remove the burr and bumps before the assembly line of the reducer, which is a common method to prepare the mechanism in advance. Special attention should be paid to the fact that in normalizing or heat treatment, the temperature in the furnace must be kept even, and the fixtures should be selected to make the steel parts evenly heated and cooled by water. It is forbidden to stack them together.
6. Control the quality of raw materials: high quality raw materials are the necessary conditions for the production and manufacture of high-quality commodities. The raw materials used by enterprises, such as aluminum alloy profiles, Q235, stainless steel plates, 50Cr and 46 steel, are used to manufacture non-standard parts such as permanent magnet machinery and equipment, mechanical equipment and automatic machinery. No matter which way, the raw materials must go through rigorous composition detection, grain size measurement and purity identification after arriving at the plant. The aim is to adjust the deformation of quenching and tempering immediately and improve the quality of tooth profile production and processing. The enterprise has strict quality management process, including raw material review, production process management, commodity factory inspection, etc.

In the processing engineering, we will encounter a variety of problems, which must be solved as soon as possible, otherwise it will affect our work, so it is not good, some problems will also affect the quality of processing, not hit the mold damage and so on, so we will understand how to prevent the phenomenon of gnawing die in the stamping process?

(1) In terms of design and equipment, if the punch is not fixed properly, such as fixing the punch by chiseling, the punch may become loose. If the low melting point alloy is used for pouring, the punch may become loose. If the blanking force is large and the root of punch is not hardened and the punch is subjected to excessive lateral force, the punch may become loose.

(2) Mold manufacturing

1. Vertical or no punch mounting.
2. The assembly of upper and lower templates, fixed plates, convex and concave dies are not parallel to each other.
3. The blanking clearance is not uniform.
4. The punch fixation did not meet the design requirements.

(3) Mold use

1. Repeated blanking or overlapping blanking, that is, one blank is punched twice or several blanks are stacked together for blanking.
2. The scraps or blanking parts left on the mould are not cleaned in time.

(4) Mold maintenance

1. The parts of the die have great wear, such as the guide parts wear, resulting in excessive fit clearance and not timely repair.
2. The mold is loose in maintenance and assembly.

The above points are how to prevent the phenomenon of gnawing die in the process of stamping. When dealing with problems, we must pay attention to some details to avoid causing more hidden dangers

Precision has a great relationship with the final results of the product. If the accuracy is not accurate, then not only the final effect of the product is not ideal, but also many problems will occur in the later use process. Later work will be very difficult, so in the process of production, we must pay attention to some factors that affect the accuracy of machining, so we will learn which factors will affect the accuracy of mechanical parts processing?

machining

When machining precision mechanical parts, the contour system controlled by digital program is widely used in milling machine, including simple, reliable and low-cost phase system with wide process capability. These systems are adopted by many factories, especially for controlling the machining of large-scale three-dimensional surface precision mechanical parts.

It is one of the main conditions to ensure the machining quality of precision mechanical parts by making control program correctly. For the digital program control phase system, the preparation of the control program is carried out by the automatic program preparation system, and its quality level largely depends on the price of the preparation control program.

The others are processing errors caused by manual control of equipment, which include accidental errors and systematic errors of process system. System error plays an important role in all machining errors, which will cause a series of NC process system errors for the whole machining of precision mechanical parts.

For example, the gap has the same consequence as the insensitive belt in the transmission chain of a machine tool, but does not include the clearance of the reverse drive chain; the amplification factor of the unstable transmission; the phase error on the control program tape; the periodic step instability of the sensor feedback, which is mainly in the form of phase instability

Inspection skills of heavy machinery parts in maintenance process

Main contents of parts view

In mechanical maintenance, parts should be checked one by one, and the main contents can be divided into the following aspects:

1. Check the precision of parts

Several precision includes scale accuracy and shape orientation accuracy, but sometimes maintenance work is not to pursue a few dimensions of a single part, but requires relative cooperation accuracy, which is often an important part of inspection work.

Roundness, cylindricity, concentricity, coaxiality, parallelism and straightness are common in the maintenance of shape and orientation accuracy.

1. Inspection of surface quality

The inspection of the surface quality of parts in maintenance is not only limited to the inspection of surface finish, but also the inspection of the defects such as scratch, burning and scuffing on the surface of used parts.

1. View of mechanical function

According to the characteristics of mechanical maintenance, in addition to checking the hardness of the mechanical function of the part data, other indicators are generally not checked, but some functions encountered in the process of parts manufacturing and maintenance, such as balance, spring stiffness, etc., can not be ignored.

CNC machining

1. Shadow defect check

In the process of manufacturing parts, there may be some original defects, such as slag inclusion and cavitation, and micro cracks may occur in the process of use. These shortcomings can not be found directly from the general investigation and measurement, but they may have severe consequences on machinery. Therefore, in the maintenance of machinery, it is necessary to have a comprehensive view of some parts.

How to check parts

There are many ways to view parts, and new viewing skills are developing rapidly. However, starting from the practice of mechanical maintenance, it can be summarized as follows:

1. Feeling check method

This is a way to identify the skill of parts by the intuitive feeling of the inspector without having to check the equipment. This method is simple, and in the mechanical maintenance, it is also relatively simple to distinguish the shortcomings of many parts to be disassembled and inspected. Therefore, this method is still useful. However, this method can not be used to view parts with high precision requirements, and requires the inspector to have rich experience.

1. Instrument and things check method

A lot of homework is done with instruments and things. Due to the different working principles and types of instruments and things, they can be divided into general measuring tools, special measuring tools, mechanical instruments and meters, optical instruments, electronic instruments, etc.

1. Physical view method

This is a method to detect the skills of parts by using the changes caused by electrical, magnetic, optical, acoustic, thermal and other physical quantities through the workpiece. The realization of this method is also combined with the instrument and the method of viewing things. This method is usually used to check the hidden defects inside the parts without damaging the parts themselves. It is widely known as non-destructive inspection. In recent years, nondestructive inspection technology is increasingly developed. Magnetic powder method, penetration method, ultrasonic wave and ray method are widely used in production.

Hardware equipment, or the application of hardware processing machine tools, in today’s machinery industry, or silicone, or mold, steel, electronic products, other products, after the processing of mechanical equipment, the effect and efficiency are much faster, and reduce the processing pressure of employees. Now hardware manufacturers include a wide range, such as keys, or some metal plates, or etching, or other materials, iron.

What is the expansion effect of hardware processing industry

1. Spray painting: spray painting is widely used in some relatively large hardware parts. The existence of spray painting can not only make the products not easy to rust, but also produce some other effects, so that the performance of the products is better. It is a step that many hardware parts processing manufacturers will carry out when processing finished products.
2. Electroplating: electroplating is a relatively common hardware parts processing technology, because the use of this process for the product surface rust resistance performance is very good, can let the product in a long period of time can be normal and stable work, and is widely used in the current hardware products processing.

What is the expansion effect of hardware processing industry

1. Polishing: polishing is often used in some daily necessities of hardware parts processing technology. Polishing is not only to maintain the appearance of products, but also to make users feel better. Especially for some products which are easy to balloon and burr, polishing is a necessary step. Now China’s hardware industry is developing rapidly, and the continuous development of science and technology is also constantly promoting the improvement of hardware processing technology. I believe that there will be more processing technology to be created in the future, which will bring convenience to human production.

What is the expansion effect of processing industry

First of all, the most important error of secondary positioning and non coincidence is the error of non coincidence. When machining the workpiece on the machine tool, it is necessary to select some geometric elements on the workpiece as the positioning datum during processing. If the selected positioning datum does not coincide with the planning datum, the datum misalignment error will occur. Measurement error: when measuring parts during or after processing, the measurement method, measuring tool precision, workpiece and subjective and objective factors directly affect the measurement accuracy. There are fixture errors and tool errors: mechanical fixture errors: the role of the fixture is to make the workpiece equivalent to the tool and machine tool with the correct orientation, so the geometric errors of the fixture have a great impact on the machining errors. Spindle rotation error refers to the variation of the actual rotation axis of the spindle relative to its uniform rotation axis at each moment, which will directly affect the accurate density of the workpiece. Any tool in the cutting process can not prevent wear, and thus cause the size and shape of the workpiece to change.