1, stamping process analysis of stamping parts, stamping parts must have a good stamping process, in order to manufacture qualified stamping parts in the simplest and most economical way, stamping process analysis can be completed according to the following methods:
A. read the part drawing; In addition to the shape and size of parts, it is also important to understand the requirements of parts accuracy and surface roughness. B analyze whether the structure and shape of the parts are suitable for stamping.
C. Analyze whether the datum selection and dimensioning of parts are reasonable, and whether the accuracy of size, position and shape is suitable for stamping.
D. Whether the surface roughness requirement of the section of the stamped part is too high.
E. whether there is a large enough production batch.
If the manufacturability of the parts is too poor, we should consult with the designers and put forward a plan to modify the design. If the production batch is too small, other production methods should be considered for processing.
2, stamping process scheme design and the best process planning and design:
A. According to the shape and size of stamping parts, preliminarily determine the performance of stamping process, such as stamping, bending, stretching, bulging and reaming.
B. check the deformation degree of each stamping method. If the deformation degree exceeds the limit deformation degree, the stamping times of this process should be calculated.
C, according to the deformation characteristics and quality requirements of each process, arrange a reasonable stamping sequence. Attention should be paid to ensure that the deformation zone of each process is a weak zone, and the formed part * * * including punching or shape * * * shall not participate in the deformation of subsequent processes. Polygon bending parts should be bent outward first and then inward, and necessary auxiliary processes, shaping, leveling and heat treatment should be arranged.
D. On the premise of ensuring the accuracy of parts, position the blanking requirements according to the production batch and blank. Determine the reasonable process combination.
E. Two or more technological schemes should be designed and compared from the aspects of quality, cost, productivity, mold grinding and maintenance, mold life and operation safety, and the best technological scheme should be selected. F, preliminarily determine the stamping equipment of each process.
3. Blank design and layout design of stamping parts;
A. According to the nature and size of stamping parts, calculate the blank size and draw the blank diagram.
B. According to the nature and size of the blank, design the layout diagram and calculate the material utilization rate. To design a variety of layout schemes, choose the best scheme through comparison.
4, stamping die design:
A. Determine the die structure of each stamping process and draw the die sketch.
B) Make a detailed structural design of the designated mold with 1-2 process, and draw the working diagram of the mold. The design method is as follows:
Determine the mold type: simple mold, continuous mold or compound mold. ※.
Design of die working parts: calculate the cutting edge size and length of punch and die, and determine the structural form and connection and fixation mode of punch and die. ※.
Determine the positioning and limiting mode of the blank and design the corresponding positioning and limiting parts. Determine the way of pressing, discharging, ejecting and pushing, and design corresponding pressing plate, discharging plate and pushing block. ※. ※.
Mold base design: including the design of upper and lower mold bases and guiding modes, and standard mold bases can also be selected. On the basis of the above work, draw the working drawing of the mould according to the proportion. ※. First, draw the blank with two-dot chain line, then draw the working part, then draw the positioning and limiting part, connect the above parts with the connecting part, and finally draw the pressing and discharging part at the appropriate position. ※. According to the specific situation of the mold, the above order can also be adjusted appropriately.
The overall dimension, closing height, fit size and fit type of the mold should be marked on the working drawing. Manufacturing accuracy and technical requirements of mould shall be indicated on the working drawing. ※. The construction drawing shall be drawn according to the national drawing standards, with standard title bar and name list. If it is a blanking die, the layout should be drawn in the upper left corner of the working drawing.
Calculate the die pressure center and check whether the pressure center coincides with the center line of the die handle. ※ If they are not consistent, modify the die result accordingly.
Calculate the punching force, finally select the punching device, and check the closing height of the die and punching device, the installation size of the workbench and the die handle and other related dimensions. * * *.※.
5. Surveying and mapping most parts of the mold requires more than three A0 drawings. Part drawings shall be drawn according to national drawing standards, with complete dimensions, tolerances, surface roughness and technical requirements marked.
6, fill in the stamping process specification card.
7. In the designed mold parts drawing, select two parts for processing technology analysis, formulate reasonable processing technology regulations, and fill in the processing technology regulations card.
8, according to the design content and design calculation to write a design specification.
Mold design steps
1. Analyze the feasibility of the designed die products. Take the computer case as an example. Firstly, the design software, that is, the set of drawings mentioned in our work, is used to analyze the product drawings of each component to ensure the correctness of the product drawings before the mold design. On the other hand, we can be familiar with the importance of each component in the whole case to determine the key dimensions, which is very beneficial in mold design. The specific method of group drawing will not be introduced in detail here.
2. The work to be done after product analysis, what kind of die structure is used to analyze products, arrange products, determine the stamping content of each process, and use design software to expand products. When the product is unfolded, it usually starts from the subsequent projects. For example, a product needs five processes, and after stamping, it starts from the product drawings to four projects, three projects, two projects and one project. After expanding a graphic, make a copy before expanding the previous project, that is, complete the product expansion work of five projects, and then carry out detailed work. Note that this step is very important and requires special care. If this step is completed well, it will save a lot of time when drawing the mold drawing. After determining the stamping content of each project, including the forming die, the inner and outer lines of the product material thickness are reserved, and the size of the convex and concave die is determined for product development.
3. Material preparation: according to the product development drawing, determine the template size in the drawing, including fixed plate, discharging plate, convex-concave die, insert and so on. Paying attention to preparing materials directly in the product development drawing is of great benefit to drawing the mold drawing. I have seen many mold designer directly calculate product development drawings to prepare materials. This method is too inefficient, so the template specifications and dimensions are directly drawn on the drawings and expressed in the form of assembly drawings. On the one hand, it can complete the material preparation, on the other hand, it saves a lot of work in the work of various parts of the mold, because only positioning, pins, guide posts and screw holes need to be added in the material preparation drawing.
4. After the material preparation is completed, you can completely enter the drawing of the mold drawing, and make another copy in the material preparation drawing to draw various parts, such as screw holes, guide post holes, positioning holes and so on. In the stamping die, the forming gap between the upper and lower dies must not be forgotten, so the die drawing of a product is almost 80% completed after these works are completed. In addition, in the process of drawing mold drawings, it refers to making, for example, different processing procedures such as scribing and wire cutting have complete layers, which is of great benefit to wire cutting and drawing management, such as color discrimination, and dimensioning is also a very important and most troublesome work, because it takes too much time.
5. After the above drawings are completed, it is actually impossible to draw. It is necessary to proofread the mold drawings, assemble all the accessories, make different layers for each different template, analyze the mold assembly with the same benchmark, such as the guide post hole, and put the product development drawing of each process into the assembly drawing to ensure that the hole position of each template is consistent and the gap between the upper and lower molds at the bend is correct.