Introduction to graduation thesis (1)
Judging from the present science, with the rapid development of science and technology, the continuous innovation of human beings in various fields, the increasing exchanges between countries and the great improvement of national strength, human beings have created many Chen Guo in many aspects. In addition, with the continuous improvement of industrial level and people's living standards, there are new requirements in many aspects, which requires new mechanical products to improve the level, and the plate feeding clamping device is one of them.
Nowadays, with the rapid development of science and technology, the speed of product upgrading is also accelerating. The clamping device in this design is developing as well as other mechanical industries. According to reliable research and investigation, the host machine industry is very extensive, especially in many high-end manufacturing industries and national key related projects, the demand for it is also expanding, so in this case, the clamping industry will inevitably develop forward. Through the unremitting efforts of several generations of scientific workers in China, a breakthrough has been made in the plate feeding device. For example, the feeder studied by Liao Weixian of Central South Academy of Sciences increased the number of silicon blocks fed from 84 to 96, which greatly improved the utilization rate of materials. By this method, the processing capacity of the punch can be increased by 160-300 tons per year. There are many kinds of gas structures in many feeding devices. For example, the manipulator can be used to feed the material. The process is that the manipulator grabs the plate conveyed by the conveyor belt and then puts it into the blanking frame. Through investigation, it is known that foreign feeding devices have developed rapidly and become more and more mature. Through the investigation of foreign production and research, in some industrialized countries or regions, especially Japan, the most representative ones are Japan and the United States, because the mechanical automatic feeding mechanism is relatively simple, so there is little research on it. Instead, it is a new research and design of feeding theory. Through the continuous design and exploration of professionals at home and abroad, many new feeding devices with epoch significance have also been designed. In Japan, some experts have developed a feeding method combining manipulator and punch. However, this method needs to be fed from the side, so the design is very complicated and it is not easy to manufacture and maintain. And the cost is relatively high, which is not suitable for large-scale production of small and medium-sized enterprises. When working, the crankshaft on the punching machine is used as the main conveying shaft. Then, the ball head part will be connected to the mechanical handwheel through the telescopic movement of the spline shaft. At the same time, the relevant transmission parts will synchronize the manipulator with the machine tool through action, thus completing the whole conveying process. In addition, the feeding device is equipped with another set of special mobile conveyor, through which the plate can be sent to the position of the main machine for processing. However, its system is based on Japan's own development. Therefore, it can only be used for domestic processing in Japan, which is not suitable for domestic vertical feeding requirements.
A large number of data show that according to the overall comprehensive level, some industries in China can not catch up with the level of developed countries. At the same time, in the clamping device industry, there is still a big gap in performance, such as reliability, safety and environmental protection. Therefore, we must vigorously develop science and technology, improve the ability of independent innovation and increase investment in science and technology. Only in this way can we catch up with the technical level of developed countries.
In this design, the hydraulic cylinder is used for pushing and fixing, and the air cylinder is used for clamping. It has many advantages, making the equipment run smoothly, greatly improving its reliability and being more sensitive in transmission. At the same time, the most supporting auxiliary mechanism in production reduces the labor intensity of workers.
Introduction to Graduation Thesis (2)
My graduation project and some reference materials come from textbooks called? Cold stamping die design? 1. Use the function of the part
Stamping handwheel is a common part in life.
The stamping handwheel component is installed on the valve, and is connected with the shaft through the inner hole to drive, so that the shaft on the valve rotates to achieve the purpose of locking or releasing the valve.
According to the part drawing of stamping handwheel, it is a rotary drawing piece with a square hole on the inner edge and a flanging on the outer edge. Each process should be analyzed, the process plan should be made, the stamping process card should be compiled, and the final assembly design of the die should be carried out. My part is as follows:
Part name: stamping handwheel
Production batch: large batch
Manufacturing material: 10 material thickness: 1mm bending radius: 1.2mm 2. Process analysis of blanking parts (1) The material is 10, and the allowable elongation [? ]=29%, elastic modulus E= 194MPa. (2) The shape and structure of the workpiece: The shape of the blanking part should avoid sharp right angles. In order to improve the service life of the die, part of the 90-degree inclination angle is changed to R 1 fillet. Other dimensions on the parts are not marked with tolerance, and shall be treated according to IT 14 grade and pressure. Into the body? Major dimensional tolerances.
Manufacturing material: 10 material thickness: 1mm bending radius: 1.2mm 2. Technological analysis of blanking parts.
(1) material is 10, and the allowable elongation [? ]=29%, elastic modulus E= 194MPa. (2) The shape and structure of the workpiece: The shape of the blanking part should avoid sharp right angles. In order to improve the service life of the die, part of the 90-degree inclination angle is changed to R 1 fillet.
Other dimensions on the parts are not marked with tolerance, and shall be treated according to IT 14 grade and pressure. Into the body? Major dimensional tolerances.
3. Analysis and determination of process scheme
This workpiece needs blanking, first drawing, punching process holes, second drawing, trimming, flanging, punching preset holes, and turning holes at the inner edge. According to the basic stamping process, there are several technological schemes as follows.
Scheme 1: blanking, drawing first, then punching process holes? The second painting? Trimming, punching and prefabricating holes? The inner edge is turned over and the outer edge is turned over.
The technological characteristics of the scheme 1 are: * * four sets of molds are needed, and the mold structure of each process is relatively reasonable, the manufacturing cycle is short, the cost is low, the processes are relatively concentrated, the production efficiency is high, the positioning of each process is reliable, the workpiece precision is high, and the mold maintenance and adjustment are convenient.
Option 2: blanking? The first painting? Drilling process holes? The second painting? Punch a preset hole? Trim? Flanging and hole turning.
Process characteristics of Scheme 2: * * 7 sets of molds are needed, and the intermediate cycle of semi-finished products is long, which leads to the impossibility of production.
Low efficiency, large number of molds and high mold manufacturing cost,
Option 3: blanking? The first painting? Drilling process holes? The second painting? Punch a preset hole? Trim? The inner edge turned over? Edge flanging
Process characteristics of scheme 3: * * 8 sets of molds are needed, and the process of this scheme is relatively scattered. Each mold has simple structure, simple manufacture and convenient maintenance, installation, adjustment and operation, but it has many working procedures, occupies a large area and uses more equipment and personnel. There are many molds, high manufacturing cost, many intermediate cycles and repeated positioning of the workpiece, and the quality of the workpiece is difficult to guarantee.
Conclusion: Through the analysis of the above three schemes, scheme 1 meets the requirements of stamping process, so scheme 1 is selected as the stamping process scheme of stamping handwheel. Namely: process 1? Blanking, first drawing and punching process holes; Process 2? Second drawing; Process 3? Trimming and punching prefabricated holes; Process 4? The inner edge is turned over and the outer edge is turned over.
4. Mould
This design has four molds.
The first topic is: compound die for punching and blanking.
The working principle of the mold: the material is fed transversely from right to left. When working, the sheet material is positioned by the positioning pin, the slider moves downwards, and the punch 1 and blanking die 4 blank; When the slider continues to descend, the punch 7 and the punch 2 1 work together to draw the blank, and the force of the elastic pressing device is transmitted to the pressing plate 22 through the ejector pin 30, and the pressing force is applied to the blank. When stretching to 4mm, punch with punch 9 and punch 2 1. After the deep drawing is completed, the slider returns, and the stripper 6 unloads the strip stuck on the punch 7. The elastic material pressing device returns to eject the workpiece, and the rigid material striking mechanism pushes the workpiece out of the convex-concave die 7; Stamping waste leaks through the hole of the platen.
The second theme is: one-step drawing die.
Working principle of the die: the die is a pressing material flip-chip drawing die. When working, the boss of the first stamping process is inserted into the blank holder 5 for positioning, and the slider moves downward. After the flange material is pressed by the drawing die 6 and the blank holder 5, the drawing die 3 and the drawing die 6 stretch. When the upper die returns, the blank holder 5 lifts the workpiece sleeved on the drawing punch 53, the upper die continues to return, and the workpiece pusher 7 pushes the workpiece out of the female die.
The third set of topics is: compound die for trimming and punching.
Working principle of the mold: This mold is a flip-chip composite mold. The punch 1 1 of the die is installed in the lower die, and the trimming die 6 and the punching punch 15 are installed in the upper die. When working, the workpiece is nested in the punch 1 1, and the upper die goes down, and under the action of trimming concave die 6 and punch 1 1, punching punch 15 and punch 1 1 When the upper die returns, the trimming waste is pushed out of the convex-concave die by the discharging plate 511; Stamping waste is directly pushed down from the inner hole of the convex-concave die; The stamping parts stuck in the trimming die 6 are pushed down by the rigid pushing device.
5. The homework and completion of this graduation project.
After several months of careful preparation, my homework is as follows: Graduation design instruction (die design for stamping handwheel) * * 25 pages of die design and assembly drawings ***4 (***2.5 A0) parts design parts drawings ***30 (A4) drawings, totally 4 A0.
Among them, there is a hand-drawn assembly drawing (secondary drawing of single-process mold)