1. Obtain the necessary information and analyze the stamping manufacturability of parts.
1 Obtain drawings of products and workpieces with specific technical requirements, and specify the size, shape, accuracy requirements and assembly relationship of the workpieces;
The process card of workpiece processing studies the relationship between the previous and subsequent processes and the processing technology requirements that must be guaranteed between each process;
The production batch of the workpiece determines the type, structure and material of the die;
4. Specifications of raw materials and blank conditions of workpieces, such as metal plate, strip, strip, waste ...;
5. Equipment data or information of stamping workshop;
6. The technical ability and equipment conditions of mold manufacturing in the tool workshop, and the standard parts of molds that can be used;
7. Study and digest the above data, and propose amendments to the established product design and process flow when necessary, so that product design, process flow and tooling design and manufacturing can be better combined and better results can be achieved.
2. The technological scheme and die structure were determined.
1 According to the shape, dimensional accuracy and surface quality requirements of the workpiece, process analysis is carried out to determine the basic processes such as blanking, punching and bending. In general, it can be directly determined from the requirements of the drawings;
2 according to the process calculation, determine the number of processes, such as drawing times;
3 according to the deformation characteristics and size requirements of each process, determine the sequence of processes, such as stamping before bending, bending before stamping, etc. If necessary;
According to the production batch and conditions, determine the process combination, such as composite stamping process and continuous stamping process.
3. Make necessary process calculation.
1 design material layout and calculate blank size;
2. The calculated blanking force includes blanking force, bending force, drawing force, discharging force and blank holder force. , if necessary, calculate the punching work and power;
3. Calculate the pressure center of the die;
4. Calculate or estimate the thickness of the main parts of the mold, such as the thickness of the fixed plate and backing plate of the female die and the male die, and the free height of the discharging rubber or spring.
5. Determine the gap between the punch and the die, and calculate the dimensions of the working parts of the punch and the die;
For the drawing process, it is necessary to decide whether the drawing method is blank-holding, calculate the drawing times and the semi-finished product size of the intermediate process.
For some processes, such as strip continuous drawing, special process calculation is needed.
4. Overall design of mould
On the basis of the above analysis and calculation, the overall design of the die structure can be carried out, and the sketch can be drawn, and the closing height of the die can be calculated preliminarily, and the overall dimensions of the die can be roughly determined.
The design content of this section is as follows:
1 directory has at least secondary titles and page numbers;
2 design task book;
3. Analyze and determine the process plan and fill in the stamping process specification;
4 process calculation;
5 mold structure design;
6. Process design of mould parts;
7. Fill in the mold description, as shown in Table 6-3;
Eight assembly steps of the whole mold;
9. Comment on the advantages and disadvantages of the designed mold;
10 reference directory;
1 1 conclusion.
Stamping die design steps
1。 First of all, if there are electronic documents, check the pictures to see if they are consistent with paper. Unclear communication with customers, including cutting edge, sharp corner, bending internal angle R, etc.
2。 Then the work difference, such as 5+0.05/-0 hole, is changed to 5.04.
3。 Then the project is expanded, laid out or sorted out, and a flow chart or layout diagram is drawn.
4。 Draw formwork and formwork, and order steel.
5。 Complete all the designs.
6。 Review to the leader
7。 According to the opinions of the leaders.
8。 Disassembling parts, dimensioning, machining instructions, etc.
9。 Print, sign and send drawings.
Basic knowledge of stamping die
1, curling
Crimping is a stamping process that rolls the edge of a workpiece into a nearly closed circle. The axis of a curled circle is linear. [ 1]
Step 2 curl the edge
Crimping is a stamping process in which the upper edge of a hollow part is rolled into a nearly closed circle.
Step 3 draw pictures
Drawing is a stamping process to change a flat blank or workpiece into a curved surface, which is mainly formed by the extension of the material at the bottom of the punch.
4, stretch bending
Stretch bending is a stamping process that realizes bending deformation under the action of tension and bending moment, so that the whole bending section is subjected to tensile stress.
Step 5 expand
Bulging is a stamping process that expands hollow parts or tubular parts radially outward. Cutting is a stamping process, which divides the forming process into several parts.
6. Leveling
Leveling is a stamping process to improve the flatness of local or whole plane parts.
7, wave forming
It is a stamping process that relies on the extension of materials to make the workpiece form regional depressions or protrusions. The change of material thickness in undulating forming is unintentional, that is, the slight change of thickness naturally occurs during deformation, which is not the requirement of design.
Step 8 bend
Bending is a stamping process in which a material is plastically deformed under pressure to make it bend into a shape with a certain curvature and a certain angle.
9. Chiseling and cutting
Chisel is a blanking or stamping process using a sharp-edged chisel. There is no lower die for chiseling, only a flat plate is placed under the material, and most of the punched materials are non-metal.
10, deep hole punching
Deep hole stamping is a stamping process in which the aperture is equal to or less than the thickness of the material to be stamped.
1 1, blanking
Blanking is a stamping process, which separates materials along a closed contour. The separated materials become workpieces or machined parts, most of which are planar.
12, shrinkage
Necking is a stamping process, which compresses the opening of a hollow or tubular part to make it shrink.
13, plastic surgery
Forming is a stamping process, which depends on the flow of materials to change the shape and size of the workpiece little by little to ensure the accuracy of the workpiece.
14, renovation
Renovation is a stamping process that cuts a small amount of material along the outer contour or the inner contour to improve the edge smoothness and verticality. Generally speaking, the finishing process can also improve the dimensional accuracy.
15, hole turning
Turning holes is a stamping process that turns materials into side flanges along the periphery of inner holes.
16, flanging
Flanging is a stamping process that changes materials into short sides along contour curves.
17, deep drawing
Deep drawing is a stamping process, which changes a flat blank or workpiece into a hollow part or further changes the shape and size of the hollow part. In deep drawing, the center piece is mainly formed by the material outside the bottom of the punch flowing into the die.
18, continuous drawing
Continuous drawing is a stamping method which uses the same pair of dies to draw the strip and coil several times to gradually form the required shape and size.
19, refinement and stretching
Thinning drawing is a drawing process that further changes the shape and size of hollow parts and intentionally thins the side wall.
20. Reverse drawing
Reverse drawing is a drawing process that turns the inner wall of hollow workpiece outwards.
2 1, temperature difference diagram
Differential temperature drawing is a drawing process which uses heating and cooling means to make the temperature of the material to be deformed much higher than that of the deformed material, thus improving the degree of deformation.
22, hydraulic drawings
Hydraulic deep drawing is a kind of deep drawing process which uses liquid in rigid or flexible container instead of punch or die to form hollow parts.
23, pressure reinforcement
Stiffness is a wave-like molding. When local undulations appear in the form of ribs, the corresponding undulating forming process is called rib compression.