1. Determine the installation height and position of the wedge through the section
1) roughly determine the position of the punch and accurately determine the angle and position of the die insert and the anti-rotation angle, and determine the size of the working surface of the selected wedge slider according to the size of the punch holder (determine the angle of the wedge model);
2) The oblique wedge is placed according to the placement angle on the die base and the position of the punch holder
2. Select the installation method of the punch holder according to the actual situation of the mold
From the perspective of the force balance of the wedge slider, the ideal fixing method is to control the stress point of the punch on the center of the wedge slider as far as possible, and the installation method of the fixing seat is arranged according to the actual situation in special cases; according to the punch The fixed angle of the fixed seat determines the approximate position of the plane of the wedge on the mold seat;
3. Determine the installation height and plane position of the oblique wedge according to the fixed position and cross-sectional diagram of the oblique wedge slider and the punch holder, and try to ensure that the installation height and plane coordinate size of the oblique wedge are integers (0, 5 at the end).
4. When designing the standard wedge mold, since the stroke of the wedge has been fixed, the following items should be considered:
Ordinary inclined wedge:
Since the working part is fixed on the lower mold, it is necessary to consider that the workpiece can be sent and taken smoothly; the stroke must not be less than the width of the flange edge + the distance of flange wedge trimming or punching and flanging + 20~30mm (Note: If it is automatic stamping, it is 30mm, and it should be 50mm in manual operation)
Lifting wedge slider stroke:
The distance from the flange to the wedge trimming, punching or flanging +20mm;
When lifting the wedge, it is necessary to consider whether the working components (punch, side trimming block, flanging knife) installed on the slider affect the assembly and disassembly of the binder core; and whether there is enough space between the wedge and the binder core. space grinding;
5. Disposal of waste
1. The waste via hole should be opened as large as possible;
2. Sometimes in order to prevent the clogging of waste materials, the waste materials of side punching holes need to be equipped with a jacking device;
3. To design waste slide plate holes on castings, fully consider the width of the maximum size of waste after rotation;
4. If the waste is too long, you can consider adding a waste knife to achieve smooth sliding of the waste and increase the strength of the mold;
5. Use the elastic ejector pin convex (concave) mold in the following cases:
5.1. In order to make the waste slip one by one;
5.2 Want to control the state of the waste when it falls;
6. If there is a rebound in the waste:
6.1. The modulus of the knife edge should be large;
6.2. It is necessary to install waste ejection device;
7. The following situations need to increase the waste guide device:
7.1. There is no space on the waste discharge side, it must be transformed into a vertical drop in a right angle direction, and the minimum vertical hole diameter is twice the punching diameter;
7.2. If it is punching on both sides at the same time, it is necessary to increase the distribution pin;
Six, the classification of the presser of the standard wedge mold:
The presser can prevent the positioning and deformation of the workpiece, and can be divided into three types according to the shape and the number of action directions:
1.1 Upper pressing core
Its advantages are: the pressing force is relatively large, and there is no need to worry about the deformation of the parts; it is close to the vertical wall surface and the end surface of the side wall, and is separated by the upper pressing core;
1.2 Wedge side pressing material core
1.3 Side pressure material and positive pressure material are shared
The pressing force of the side pressing material is insufficient;
unstable parts;
The positive pressure material should be pressed 10mm earlier than the side pressure material to compress the workpiece;
7. The positioning of the wedge and anti-lateral force
There are two types of wedge positioning and key positioning;
Trimming and flanging on one side, if the material thickness is relatively thick, measures to prevent lateral force are required;
Measures and forms to prevent lateral force:
Add guides;
The guiding requirements of wedge molds are relatively high, especially with side punching and side trimming. Because the gap between trimming and punching holes is very small, such molds are generally guided by guide posts and box heels;
The pressing core is generally guided by a guide plate, and if there are special requirements, the guide column can be added (designed according to the specific requirements of the customer);
A tapered locator can also be designed between the pressing core and the lower die, which can improve the guiding accuracy of the pressing device;
The stroke of the presser must be greater than the length of the punch entering the presser, otherwise the punch will break
