Using the principle of combining the advantages of length processing of hydraulic bending machine and the advantage of single stamping of stamping die, a special punching processing equipment for profiles is established. The production efficiency of profile punching processing is improved; the product quality is improved; the labor intensity of workers is reduced; the problem of relying on human factors to improve product quality is solved; the reliability of profile punching processing is guaranteed. The subject of development of special equipment for profile punching is put forward.
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overview
As we all know, the stamping die can only be used in a single mode on the punching/pressing machine, and the hydraulic bending machine can only use the bending die to bend the length of the plate. If we can combine the length processing of the bending machine Effective combination of processing; for some products (such as profiles) that are stamped online, it means that the production efficiency has been increased several times; the product quality has been greatly improved; and the labor intensity has been greatly reduced. It has an immeasurable impact on reducing production costs.
The feasibility of the program
For the products processed online, most of them are mainly punching. It would be great if we can make the working method of the bending machine similar to that of the punching machine; that is, make the lower die table of the bending machine so that it can be placed Fix the workbench of the stamping die, and only need to change the waste discharge of the die to the side and rear row (the lower discharge is more difficult due to the existence of the front vertical plate under the machine tool.). The upper mold of the bending machine is changed to an inverted "T" type platen, and then the appropriate tonnage of the machine tool, the height of the slider opening, and the length of the machine tool are selected. Theoretically the scheme is feasible.
The plan must make necessary adjustments to hydraulic bending machines, molds and other related factors:
1. Machine tool adjustment
2. The bending machine removes the upper and lower molds and the back gauge device. Play to reduce the cost of machine tool purchase.
3. The bending machine makes another "T" upper mold pressing plate of the slider, and flips it for leveling. Main function: press the upper die, but it must be pressed to the stamping center of the upper die.
4. Remove the workbench of the lower die from the bending machine, and make another workbench that widens and smooths the "U" shape with a "T" groove in the middle. The main function of the "U"-shaped table is to limit the serial movement of the mold back and forth, and to allow the mold to slide along the length of the table. The "T" slot is used to fix the mould.
5. Make an adjustable stroke stopper at both ends of the bending machine table. The adjustable stroke stopper can limit the working stroke of the mold and protect the mold.
6. Adjust the travel switch and time relay of the bending machine to the appropriate position. The stroke of the bending machine must be slightly greater than or equal to the stroke of the adjustable stroke block, and the time relay must be lowered (generally less than 1s) to increase the working frequency and obtain the corresponding working pressure.
7. The empty stroke height of the bending machine should be as short as possible.
8. According to the requirements of the profile, choose the length of the machine tool, the height of the opening of the machine tool slider, and the tonnage of the machine tool; the tonnage is generally selected to be greater than or equal to 40T, and the length is selected to be greater than or equal to 1500mm.
Mold Adjustment
1. The mold base adopts the self-made rear side mold base of uniform size, and the width of the lower formwork must be slidingly matched with the width of the "U"-shaped workbench. It plays the role of adjusting the mold according to the requirements of the profile.
2. The compression spring of the same length on the guide post of the mold base can automatically bounce off after stamping (mainly to solve the influence that the upper mold of the mold and the upper slider of the bending machine cannot be connected) the upper and lower molds.
3. The stamping dies of high-end stamping dies generally focus on punching small holes, and the blanking is not good, mainly because of the existence of the front vertical plate (in the middle of the U-shaped workbench) under the machine tool, which is relatively difficult for the country.
4. Material discharge, generally adopts side and rear discharge, and it is necessary to pay attention to smooth discharge at all times during the working process.
5. The mold platen must be close to but not cover the guide sleeve hole of the upper die. In order to prevent over-travel damage to the mold and the upper mold to lean forward, and damage the die and guide pillars.
6. The height of the lower mold must be consistent. That is to say, sharpen the knife edge uniformly. If it cannot be unified, it needs to be almost leveled with copper sheet and paper. In order to prevent the workpiece from being deformed due to stamping not on the same plane.
7. The height of the opening must be consistent and the "T"-shaped pressure plate should always press the upper formwork. In order to prevent the upper mold from being pushed away by the sudden spring of the guide post compression spring, the upper and lower molds will be separated quickly.
8. Parts must be made into standard accessories for easy maintenance and replacement.
9. The hole distance of the material is short, and the mold cannot be installed. It can be molded with multiple holes, or punched at intervals.
10. The arrangement of the position on the work table should not make the slider tilt up when the machine tool is working, that is, the center of gravity of the machine tool slider's downward force must be consistent with the punching center of gravity of the profile hole.
Requirements for profiles and spaces
1. The straightness of the rear profile needs to be high.
2. High position accuracy.
3. More and as evenly divided or symmetrical as possible.
Conclusion: The combination of hydraulic bending machine and stamping die has an irreplaceable effect on the improvement of product production efficiency and product quality; it has an irreplaceable role in the requirements of employees' personal quality, labor intensity and safety.
Afterword
Facts have proved that it is feasible to apply stamping dies to hydraulic bending machines. Our company has been using them for 2 years, and the effect has been good. It not only solves the problem of shift production, but also solves the problem of hole quality; it greatly saves production costs and provides enterprises with It is possible to gain a foothold in the new round of economic crisis.
With the continuous emergence of new materials, new technologies, and new processes, there are more and more various profiles on the market, and more and more products made of profiles. Most of the processing methods of profiles are cutting and punching; while the existing production methods of profiles are mostly punching or scribing and drilling; the production efficiency is extremely low and the product quality cannot be guaranteed. Many products are bought home. Assembling, either the holes are not aligned, or the holes are missing; the installer needs to bring his own pistol drill to drill the holes. It is both troublesome and affects product reputation. If things go on like this, it will seriously affect the survival of enterprises. Such as all kinds of solar water heater brackets, photovoltaic brackets, sunshade (rain) shed brackets, shelves, etc.
Most of the profiles on the market are below 2000mm, and the combination of stamping dies and hydraulic bending machines provides the possibility to solve this effect.
The success of the combination of stamping dies and hydraulic bending machines has also raised the question for equipment manufacturers, whether it is possible to develop a special machine tool for profile punching to solve such problems. After all, the use of bending machines is flawed (waste discharge problem).
