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Do you understand the steps of stamping process design?

2023-03-03

Do you understand the steps of stamping process design? This article will give you a specific introduction based on our actual processing and production experience combined with some experience sharing on the Internet. Including the collection and analysis of relevant original data in the early stage, the analysis and review of stamping process, and the formulation of stamping process plan.

 

Stamping parts Stamping processing

 

1. Collect and analyze original data about the design

 

(1) Product drawings and technical conditions of stamping parts;

 

(2) Dimensions, performance and supply status of raw materials;

 

(3) The production batch of the product;

 

(4) The existing stamping equipment conditions of the factory;

 

(5) The existing mold manufacturing conditions and technical level of the factory;

 

  (6) Other technical information, etc.

 

2. Analysis and review of stamping process of product parts

 

Stamping processability refers to the adaptability of stamping parts to the stamping process, that is, whether the structural shape, size, precision requirements and materials used of stamping parts meet the process requirements of stamping processing.

 

3. Formulate stamping process plan

 

Through analysis and calculation, determine the nature, quantity, arrangement sequence, combination method and positioning method of the stamping process; determine the shape and size of each process part; arrange other non-stamping auxiliary processes, etc.

 

(1) Determination of the nature of the process

 

The process nature of stamping parts refers to the type of stamping process required for the part.

 

The nature of the stamping process should be determined according to the structural shape, size and accuracy requirements of the stamping parts, the deformation laws of each process and the limitations of certain specific conditions.

 

a. In general, the nature of the process can be visually determined from the part drawing

 

b. It is necessary to calculate, analyze and compare the part drawings to determine the nature of the process

 

c. In order to improve stamping deformation conditions or facilitate process positioning, additional processes need to be added

 

d. Sometimes in order to save materials, it will also affect the determination of the nature of the process.

 

  (2) Determination of the number of processes

 

a. The size of the production batch

 

b. Requirements for parts accuracy

 

The trimming process is an essential process to ensure the accuracy of the workpiece.

 

c. The factory's existing molding conditions and stamping equipment

 

d. Process stability

 

Appropriately reduce the degree of deformation in the stamping process and avoid stamping near the limit deformation parameters.

 

(3) Arrangement of process sequence

 

The arrangement of the stamping process sequence is mainly determined by the stamping deformation law and the quality requirements of the parts, followed by convenient operation, reliable blank positioning, and simple molds.

 

a. The weak area must be deformed first, and the deformed area should be the weak area

 

b. The part that meets the requirements of the part drawing obtained after the process is formed must not be deformed in the subsequent processes

 

c. Arrangement principle of hole process

 

All holes, as long as their shape and size are not affected by subsequent processes, should be punched out on the flat blank.

 

The hole whose position will be affected by the deformation of a certain process in the future should generally be punched after the relevant process is completed.

 

Holes with high precision requirements and holes with position requirements should be punched after forming, and other holes can be advanced according to the situation.

 

If the large hole on the part is close to the small hole, the large hole should be punched first.

 

Blanking first and then punching.

 

The holes on the outer edge of the stretched part and the vertical part of the flanging part are punched after deep drawing and flanging.

 

d. Arrangement principle of the process sequence of bending parts

 

Generally, the outer corner is bent first, and then the inner corner is bent.

 

e. When stamping at different positions, the arrangement of the process sequence should be determined according to the interaction of the deformation area, the structure of the mold, the difficulty of positioning and operation

 

(4) Selection of process combination mode

 

Whether the process combination can be realized and the degree of combination mainly depends on the production batch, shape size, quality and accuracy requirements of the parts, and secondly consider the mold structure, mold strength, mold manufacturing and maintenance, and on-site equipment capabilities.

 

a. Consider the possibility of process combination from the shape, size, precision, mold structure and strength of parts;

 

b. Consider the feasibility of process combination in terms of mold manufacturing and maintenance capabilities and on-site equipment capabilities.

 

  (5) Selection of process positioning datum and positioning method

 

a. Selection of positioning datum

 

Principle of datum coincidencemake the positioning datum coincide with the part design datum as much as possible

 

The principle of unification of benchmarks

 

When multiple processes are used to disperse stamping on different molds, the same positioning reference should be used for each process as much as possible.

 

Benchmark reliability principle

 

b. Choice of positioning method

 

There are three basic positioning methods: hole positioning, plane positioning and shape positioning.

 

  (6) Determination of shape and size of parts in stamping process

 

a. The size of the process part should be determined according to the limit deformation parameters of the stamping process

 

b. The size of the process parts should ensure the reasonable distribution and transfer of metal during stamping deformation

 

The formed part cannot be changed in the subsequent processes;

 

The internal and external parts to be formed separated by the formed part need to ensure the distribution and transfer of materials within their respective ranges in the subsequent processes

 

c. The shape and size of the process parts should be conducive to the stamping and forming of the next process

 

d. The shape and size of the process parts should be conducive to ensuring the surface quality of stamping parts

 

The fillet radius of the process parts that have been drawn many times should not be too small;

 

By adopting the step-by-step forming method of the cone surface or one-time forming of the cone surface, a better forming effect can be obtained.

 

e. The shape and size of the process parts should meet the strength requirements of the mold

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