Yearly Archive September 14, 2020

No matter what kind of work you are doing, it is common to have problems in the process of work. If you encounter problems, you must solve them in time to avoid causing bigger problems later. However, there is a problem that many users easily ignore when dealing with a problem, that is, they will not find the reason, just solve the problem directly. Before solving the problem, we must find out the reason first, so as to eliminate the root. Then we will understand what causes the punch to fall off in the stamping process?

1. For the fixed structure of punch pressed in by interference fit, the punch is easy to loose and fall off because it fails to meet the required interference during manufacturing and is remedied by “twist extrusion and chiseling”.
2. If the punch is not stepped or fixed with fasteners, the unloading force will increase and the punch will be pulled out when the thick, hard or viscous material is punched and the clearance between the discharge plate hole and the punch is too small.
3. The rigidity of punch or die base is poor, and elastic deformation occurs in the process of blanking, which makes the punch collide with the discharge plate or gets stuck with the female die, which increases the unloading force and makes the punch pull out easily.
4. If the gap between punch and die is too small and the working surface is rough or the gap is inclined to one side, the discharge force can be increased and the punch can be pulled out.
5. The die with low melting point and die is easy to pull out when assembling.

No matter what the problem is, if we want to solve the problem, the first thing is to find out the cause of the problem, so that we can solve the problem according to the order. If we only solve the surface problem, then we believe that it will recur in a short time. Then we will understand what causes the uneven shape of stamping and drawing parts?

1. There is no air hole on the punch.

In the stamping process, the air in the workpiece is compressed by the punch and can not be discharged, which makes the shape of the drawing part uneven. This reason is often ignored by many people. The solution is to add air holes on the punch.

1. The blank is not smooth.

The surface of the blank is not smooth, which leads to the surface unevenness of the drawing part. The solution is to replace the material with good surface quality.

1. The material has large rebound.

The springback of material is large, resulting in uneven shape of drawing parts. The solution is to increase annealing or shaping process.

1. The gap between punch and die is too large.

If the gap is too large, the working surface of the die will lose the straightening effect on the workpiece wall, and the workpiece shape will be uneven. Therefore, the die gap should be repaired or replaced with new parts.

1. The negative deviation of material thickness is too large.

If the thickness of the material is too small, the gap between the dies will be relatively large, resulting in uneven shape. It is necessary to change the material with proper thickness.

When processing, we will encounter a lot of fault problems, which are caused by some problems between parts or some operation problems. Before processing, we need to understand the common sense of processing technology. Then we will learn about the common sense of the Dragon Gate milling process

1. What is gantry milling processing: gantry milling processing, full name: gantry milling machine processing.
2. Classification of gantry milling machining center: gantry milling machining center generally has portal frame and horizontal long bed.
3. Characteristics of gantry milling: it can use multiple milling cutters to process the surface at the same time, and the machining accuracy and production efficiency are relatively high
4. Application scope of gantry milling: gantry milling is suitable for processing plane and inclined plane of large workpiece in batch and mass production.
5. The difference between gantry milling and CNC gantry milling: CNC gantry milling machine can also process space curved surface and some special parts.
6. The difference between the gantry milling machine and the planer: when the gantry milling machine is processing, the shape of the gantry milling machine is similar to that of the planer planer. The difference lies in that the cross beam and column of the gantry milling machine are not planer tool holders, but milling tool holders with spindle box. And the reciprocating motion of the longitudinal table of the gantry milling machine is not the main motion, but the feed motion, and the rotary motion of the milling cutter is The main movement.

There are also some variants of the gantry milling machine to adapt to different processing objects. The main parameter of the gantry milling machine is the width of the working table, and there are also the gantry width as the parameter. Let’s talk about it today. If you want to know more, please visit Dongguan machining website

Machining process is the process of manufacturing workpieces or parts. The process of changing the shape, size and surface quality of blank directly by mechanical processing method is called machining process. For example, the processing process of an ordinary part is rough machining – finishing – assembly – Inspection – packaging, which is a general process of processing.

Mechanical processing technology is to change the shape, size, relative position and nature of the production object on the basis of the process to make it a finished product or semi-finished product. It is a detailed description of each process. For example, as mentioned above, rough machining may include blank manufacturing, grinding, etc. finishing may be divided into turning, fitter, milling machine, etc., and each step should be detailed Fine data, such as how much roughness to achieve, how much tolerance.

According to the quantity of products, equipment conditions and the quality of workers, technicians determine the technological process to be adopted, and write the relevant contents into process documents, which are called process procedures. This is more targeted. Every factory may be different, because the actual situation is different.

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.

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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.