What are the steps and processes of stamping die design? It's all done this time!

First: Product Import

1. Import process of conventional products for precision die stamping

1.1 Product Drawing Processing Drawing Layout Drawing Structure Drawing Group Drawing Die Drawing

1.2 Layout and Structural Drawings of Continuous Dies to be Audited

1.3 Layout and Structural Drawings of Single-punch Dies shall be audited

1.3 Mould drawings shall be checked and signed for validity with clear specifications.

2 Sample Control Flow

Provide samples on site self-inspection quality control department testing testing report testing report confirmation Engineering Department customers

II: Die Design

1. Mould design process

(1) Flow chart of die design

(2) This is the basic process of die design. Generally, the steps of this process should be followed to plan and implement the design work. For the design of some special products, on the basis of this process, appropriate changes can be made according to the actual situation.

2. Drawing specification of product drawing, unfolding drawing, processing (process) drawing and strip drawing

(1) Product drawings or products (samples) for the opening of product drawings are provided by customers and the document control center. Because the product drawings come from different customers, the specifications are different, and the drawings are not clear, the marking is not perfect, the size or testing benchmarks are confused, or the errors caused by human negligence. Therefore, based on the original drawings and on the premise of being faithful to the original design, we should draw our own product drawings for our own use. For the process problems in customer drawings, timely communication with the engineer of the customer, which is difficult to meet the process or structure requirements, can be negotiated with the engineer of the other party, and solved by reducing the process requirements, changing the product structure or adding process aids. Customer's original drawings shall not be changed and kept as they are. Samples provided by customers can be accurately measured and mapped by various means to make product drawings. Customer samples should be properly preserved. The product drawings need accurate data, clear requirements, perfect dimension marking, reasonable tolerance and easy detection.

(2) After confirming the product drawings of the processing drawings, the drawing of the processing drawings is started. The following points should be paid attention to in drawing up processing drawings

Points:

A: The size of the product can be divided into punching and blanking. The punch size is determined by the punch, and the blanking size is determined by the die.

B: The value of product tolerance is mainly based on product drawings. If there are tolerances on product drawings, they shall be executed according to the drawings. If there are no tolerances on product drawings, the tolerances commonly used by customers shall prevail.

The direction of tolerance value refers to figs. 1-1. For the dimension that will become larger after blanking, the dimension of the processing drawing is 2/3 of the lower deviation, and for the dimension that will become smaller after blanking, the dimension of the processing drawing is 2/3 of the upper deviation. If the size of the blanked holes is basically unchanged after equal punching, the value is chosen according to the intermediate tolerance.

C: Considering the deformation trend of the product in the forming process, some pre-remedial measures are taken for these deformation situations.

(3) According to the processing drawing, the length of each bending section is marked in order to facilitate inspection.

A: The principle of unfolding calculation is that the outer layer of sheet metal is subjected to tension stress and the inner layer is subjected to compression stress. There is a transition layer between tension and compression, which is neither tension nor pressure. The length of the neutral layer in the process of bending is the same as that before bending, so the neutral layer is the basis of calculating the unfolding length of bending parts. Quasi-neutral layer and intermediate layer of sheet thickness are different concepts. The position of the neutral layer is related to the degree of deformation. When the bending radius is large and the bending angle is small, the degree of deformation is small, and the position of the neutral layer is close to the center of the thickness of the sheet metal. When the bending radius is small and the bending angle increases, the degree of deformation increases, and the position of the neutral layer gradually moves to the inside of the bending center. The distance from the neutral layer to the inside of the sheet metal is expressed in lambda.

B: Basic formulas for expansion calculation: product expansion length = in-material + in-material + compensation

A: R angle expansion is based on the principle that the material length of the neutral layer remains unchanged.

R = R + Kt

(4) Belt drawing (process drawing, layout drawing)

(1) According to customer requirements, product accuracy, product output, die life, process characteristics, etc., to determine whether to use continuous or single process die.

(1) According to the requirements of the product precision, the total production of the mould, the speed of the production of the mould and so on, the classification of the precision grade of the mould is determined. Precision continuous die can be divided into four grades: A, B, C and D. Precision single process die can be divided into three grades: A, B and C. The classification criteria are shown in the table below.

(1) The layout method of blanking parts on strips is called layout. Each workpiece will have a variety of layout schemes.

The layout methods are straight row, single row, multi-row, oblique row, head-to-head row, head-to-head oblique row, etc.

Although the layout work is simple, it is very important. The principle of layout has four points:

A: Improving material utilization ratio accounts for more than 60% of the total cost of stamping parts, which is an important economic index. There are two kinds of wastes produced in the blanking process: structural wastes and process wastes. In layout, process waste should be minimized and material utilization rate should be increased.

B: Easy to operate and safe to reduce the worker's labor intensity. For the single-process die, the material turnover is less in the blanking process. When the material utilization ratio is the same or similar, the layout scheme with wide strip material and small feed distance should be selected as far as possible.

C: The die structure is simple and the service life of the die is high.

D: Layout should ensure the quality of blanking parts. This will be explained in detail in the next section.

(1) Before the layout of precision continuous die is determined, the superposition drawing of blanking punch is made. The purpose of this drawing is to ensure that all waste materials are washed out and complete products are obtained. First of all, determine the edge of the product.