Dimensional accuracy issues and influencing factors of metal stamping parts

There are four main reasons for sudden brake failure during the braking process of a car's braking system. Firstly, it may be due to a brake failure caused by a lack of brake fluid in the master cylinder of the braking system; Secondly, it may be due to the leather bowl in the brake master cylinder of the braking system being stepped over or damaged, resulting in brake failure; Once again, it is possible that the brake failure was caused by the rubber bowl in the brake cylinder of the braking system being stepped over or damaged; Possible brake failure caused by severe damage to the brake pipeline in the braking system. Below is a detailed explanation.

When the braking system of a car malfunctions, stop immediately and conduct a check for the brake failure issue. We need to first observe whether there is a leakage problem in the braking system, which often occurs in the push rod braking position of the brake master cylinder. If it is determined through observation that there is a leakage problem in the master cylinder of the brake system, we should consider the damage or overturning of the brake master cylinder's cup; If there is a problem of brake fluid leakage at the position of the brake wheel, we need to consider the damage or overturning of the brake cylinder cup. During the process of brake fluid leakage, the problem of brake pipeline leakage is checked and generally diagnosed through observation.

Metal stamping parts; The dimensional accuracy refers to the difference between the actual size of the stamped part and the basic size. The smaller the difference, the higher the dimensional accuracy of the metal stamped part. Deviation in dimensional accuracy of stamped parts is one of the common problems in stamped parts. The dimensional accuracy of metal stamping parts can generally be divided into two categories: grade and ordinary grade. Grade is the precision that can be achieved in stamping technology, while ordinary grade is the precision that can be achieved with more economical means. When the precision of mold manufacturing is high, the external dimensional accuracy of metal stamping parts can reach IT10 level, and the internal hole size can reach IT9 level.

Factors affecting the accuracy of metal stamping parts:

1. The quality of raw materials is poor.

2. Due to improper adjustment of the previous process or wear of the rounded corners, the principle of equal volume during deformation is disrupted in multi process parts, resulting in changes in dimensions after punching.

3. Due to poor positioning during operation or poorly designed positioning mechanism, the blank shifted during the punching process. Or inaccurate positioning caused by defects in the cut (such as angularity, missing edges, etc.) can lead to dimensional deviations.

4. The punching sequence is incorrect.

5. Mold blade size manufacturing exceeds tolerance

6. The springback during the punching process of stamped parts and the inconsistency between the shape of the workpiece in the previous process and the shape of the supporting surface of the working part of the mold in the next process cause deformation of the stamped parts during the punching process. After punching is completed, elastic recovery occurs, which affects the dimensional accuracy.

7. The board shape is not good.

The problem of brake biting occurred during the braking process of the car, mainly due to the lack or detachment of the brake pedal return spring, resulting in the brake system not having free travel; The problem of brake pedal shaft corrosion can also lead to brake biting in the braking system; There is a small gap between the friction pads of the brake shoes and the brake drum, which can also cause brake biting problems in the braking system; Damaged or swollen brake master cylinder cups in the braking system can also lead to brake biting issues; Failure to replace and clean the brake fluid in the braking system in a timely manner can result in dirty brake fluid and cause brake biting problems in the braking system.

In the process of fault diagnosis, we need to release the brake pedal of the braking system. If the brake wheel still has braking function in the relaxed state, it indicates that there is a problem of brake biting in the braking system; If the brake wheel hub overheats during the driving process of the car, it indicates that the brake master cylinder in the braking system has malfunctioned and further troubleshooting is needed. This troubleshooting process is mainly aimed at the brake master cylinder in the braking system. If some of the brake wheels have brake biting problems, it is possible that some of the brake wheels have blocked brake pipelines, causing the cylinder in the brake system to be unable to return oil. If there are still some brake wheel biting problems after corresponding actions, we need to consider the appropriate issue of brake clearance. If the brake clearance is too small, it can also cause brake wheel biting problems. If the above inspection steps are normal, we need to check the brake cylinder return spring in the brake system.