Method for replacing die of internal high-pressure forming testing machine

Abstract

The invention relates to an internal high-pressure forming testing machine mold replacement method, which utilizes an existing manual forklift in a laboratory to be matched with a special mold replacement auxiliary supporting table to play a role of a bridge, so that a pallet fork of the manual forklift is connected with a mold mounting position of a testing machine platform, and rapid replacement of an internal high-pressure forming testing machine mold is realized. The problems that in the prior art, when an internal high-pressure forming testing machine die is replaced, operation intensity is large, working efficiency is low, and potential safety hazards exist are mainly solved. By adopting the scheme, the labor intensity of manpower can be greatly reduced, the overhaul operation efficiency is improved, and safe and reliable operation is ensured.

Description

Technical Field

[0001] The invention relates to a replacement method, in particular to a replacement method for an internal high pressure forming testing machine mold, and belongs to the technical field of testing machine molds. Background Art

[0002] In industry, the high pressure forming test machine is used to process pipes of various shapes, which is suitable for the mass production of single parts. The high pressure forming test machine in the laboratory is mainly used to carry out the forming limit and expansion rate test of the pipe, and evaluate the quality of the weld. In combination with the dynamic strain measurement system, the deformation test of different strain paths of the pipe can be carried out. In order to recommend different process parameters of high pressure forming of pipes to users, it is necessary to carry out high pressure forming tests under different molds, so replacing the mold has become an indispensable task. The mold of the high pressure forming test machine equipped in the laboratory is divided into 4 pieces, left and right, up and down, with a total weight of about 300Kg. The conventional replacement method is to use an automatic forklift to move the mold out, but due to the narrow laboratory space, the company's existing minimum 5-ton automatic forklift cannot enter the equipment area, and it is difficult to disassemble such a heavy mold by manpower, so replacing the mold has become a big problem. Although the existing 2-ton manual forklift in the laboratory can move in the equipment area, due to limited space, the fork of the manual forklift cannot reach the mold installation position on the test machine platform, and cannot meet the requirements of the forklift for mold replacement.

[0003] The laboratories of domestic scientific research institutions are basically not equipped with high pressure forming test machines, so there is no ready-made solution for the mold replacement method of the high pressure forming test machine in a small space. In view of the current situation, the technicians conducted research and hoped to achieve convenience, safety and efficiency when replacing the mold by adding a mold replacement auxiliary device. Therefore, it is urgent to develop an auxiliary device and method for the mold replacement of the high pressure forming test machine.

[0004] According to the query of the Chinese and foreign patent database search platform, the patent No. 1 "Hydraulic forming die assembly and method for forming non-narrowed pipe fittings" with publication number CN1233983A discloses a mold assembly having a mold device that can jointly define a mold cavity in which a metal tubular blank can be placed, and the first mold device can be moved to close the mold cavity. After the mold cavity is closed, the first and second mold devices can be moved to reduce the cross-sectional area of ​​the mold cavity, so that the metal tubular blank in the mold cavity is deformed. Patent No. 2 "Large diameter pipe fitting internal high pressure forming mold" with publication number CN101322995B discloses a large diameter pipe fitting internal high pressure forming mold, which relates to a pipe fitting forming mold. The present invention solves the problem that the force reduction shaft in the existing pipe fitting forming mold cannot be used for the forming of pipe fittings with curved axis, and the problems of waste of materials, great processing difficulty, heavy weight, difficulty in loading and unloading parts and low efficiency when using a full-length force reduction shaft for pipe fittings with longer axis. The two punches of the present invention are respectively arranged on the lower die, and shoulder holes are respectively opened on the two opposite end faces of the two punches, and the two force transmission pistons are respectively arranged in the shoulder holes of the two punches, and the two first force transmission keys are respectively installed in the two first force transmission key installation holes, and the two first force transmission keys are tightly matched with the two first force transmission key installation holes. The present invention can be used for the forming of curved axis pipe fittings, and has the advantages of saving materials, being easy to process, having a small weight, high efficiency, reasonable structure, effectively reducing the thrust required by the horizontal cylinder, being easy to load and unload parts, and being suitable for batch production. Patent 3 "Pipe Forming Die" with publication number CN2614097Y, the utility model provides a pipe forming die, which relates to a forging forming die. It includes a lower die, a die core, a spring, and a pressure plate. A step cavity is arranged at the upper end of the lower die, a step hole is arranged at the lower end, and an inner hole of a smaller diameter is arranged in the middle thereof, which is communicated with the cavity and the step hole. The die core is located in the middle of the lower die and is matched with the inner hole in the middle of the lower die with a small gap. A spring and a pressure plate are arranged in the step hole of the lower die. The pressing plate is fastened to the bottom of the lower die, and the die core is pressed by a spring. The step cavity of the lower die and the working surface of the die core respectively have a draft angle. It directly uses the pipe to manufacture parts with stepped inner holes through forging, which reduces the processing allowance, saves materials, and improves production efficiency. The utility model has a simple structure, is easy to process and manufacture, and has strong applicability.

[0005] The above three patents focus on the structural characteristics and working advantages of the mold, and do not involve auxiliary devices and methods for mold replacement. In order to overcome the problem that mold replacement of high-pressure forming testing machines in laboratories is time-consuming and labor-intensive, and there are safety hazards, the present invention proposes a technology that is different from the above methods. Therefore, the main problem to be solved by the disclosed technology is different from this technology. Summary of the invention

[0006] The present invention aims at the problems existing in the prior art and provides a method for replacing the mold of an internal high pressure forming test machine. The technical solution mainly solves the problems of high work intensity, low work efficiency and potential safety hazards when replacing the mold of an internal high pressure forming test machine in the prior art. The adoption of this solution can greatly reduce the labor intensity of manpower, improve the efficiency of maintenance work, and ensure safe and reliable operation.

[0007] In order to achieve the above object, the technical solution of the present invention is as follows: a method for replacing a mold of an internal high pressure forming test machine, comprising the following steps:

[0008] Step 1: Shutdown for maintenance;

[0009] Step 2: While ensuring safety, press the manual operation button of the testing machine to lower the upper mold frame and make it contact with the lower mold to complete the mold closing;

[0010] Step 3: Remove the connecting bolts between the upper die and the upper die frame;

[0011] Step 4: Press the manual operation button to raise the upper die frame to the highest position. At this time, the upper die frame is completely separated from the upper die.

[0012] Step 5: Remove the connecting bolts between the lower die and the lower die mounting platform;

[0013] Step 6: Place the auxiliary device for mold replacement on the existing manual forklift so that the pulley of the auxiliary device for mold replacement is located on the fork of the forklift and ensure that the pulley can slide freely on the fork;

[0014] Step 7: Raise the fork to the mold height position of the testing machine platform, manually push the mold replacement auxiliary device, and move the mold replacement device on the fork through the pulley until it reaches the testing machine platform. At this time, part of the pulley of the mold replacement auxiliary device is on the testing machine platform, and part of the pulley is on the fork, ensuring that the pulley can be completely moved back to the fork;

[0015] Step 8: Remove the upper and lower molds after mold closing from the mold grooves, and then place them on the mold replacement auxiliary device respectively;

[0016] Step 9: Manually push the mold replacement auxiliary device to return the pulley on the testing machine platform to the fork;

[0017] Step 10: Pull the forklift back to make the fork leave the testing machine platform, and lower the fork to the ground to complete the disassembly of the upper and lower molds;

[0018] Step 11: Use the same method to move the new mold to the mold platform using the fork to complete the mold replacement.

[0019] Among them, in step 6, the front side of the mold replacement auxiliary device is a flat device for placing the mold, and the back side is 5 on each side.

[0020] A pulley without drive, the mold change auxiliary device is manually pushed and the pulley can slide freely.

[0021] Among them, in step 6, a safety pin is set on the left and right sides of the mold replacement auxiliary device to ensure that the pulley can only move forward and backward without shaking left and right, thereby ensuring that the auxiliary device will not fall off the fork, ensuring the safety of the entire action process.

[0022] Compared with the prior art, the present invention has the following advantages: the technical solution is simple and efficient, and the improved method can effectively solve the problems of high work intensity, low work efficiency, and potential safety hazards when replacing the mold of the internal high pressure forming test machine. Under the premise that the existing mold replacement is completely dependent on manpower, this technology improves the existing method, ensuring that the work efficiency is improved while not increasing equipment and reducing potential safety hazards. The original time required to replace a mold is about 4 hours. After using this method, the operation time of replacing a set of molds is shortened to 0.5 hours, and the operation efficiency is increased by 8 times. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Flow chart for replacing the die of the high pressure forming test machine;

[0024] Figure 2 Layout drawing of auxiliary device for mold change;

[0025] Figure 3 Implementation diagram of the mold changing auxiliary device.

[0026] In the figure: 1. Fork, 2. Auxiliary device support, 3. Pulley, 4. Safety pin, 5. Automatic forklift assembly. DETAILED DESCRIPTION

[0027] In order to deepen the understanding of the present invention, the present embodiment is described in detail below with reference to the accompanying drawings.

[0028] Embodiment 1: An auxiliary device and method for replacing a mold of a high pressure forming test machine in a laboratory, mainly comprising the following steps, see Figure 1 :

[0029] 1) Shutdown for maintenance;

[0030] 2) While ensuring safety, press the manual operation button of the testing machine to lower the upper mold frame and make it contact with the lower mold to complete the mold closing;

[0031] 3) Remove the connecting bolts between the upper die and the upper die frame;

[0032] 4) Press the operation button to raise the upper die frame to the highest position. At this time, the upper die frame is completely separated from the upper die;

[0033] 5) Remove the connecting bolts between the lower die and the lower die mounting platform;

[0034] 6) Place the auxiliary device for mold replacement on the existing 2-ton manual forklift so that the pulley of the auxiliary device for mold replacement is located on the fork of the forklift, ensuring that the pulley can slide freely on the fork.

[0035] 7) Raise the fork to the mold height position of the testing machine platform, manually push the mold replacement auxiliary device, and move the mold replacement device on the fork through the pulley until it reaches the testing machine platform. At this time, part of the pulley of the mold replacement auxiliary device is on the testing machine platform, and part of the pulley is on the fork, ensuring that the pulley can be completely moved back to the fork;

[0036] 8) Remove the upper and lower molds after mold closing from the mold grooves and place them on the mold replacement auxiliary device respectively;

[0037] 9) Manually push the mold replacement auxiliary device to return the pulley on the testing machine platform to the fork;

[0038] 10) Pull the forklift back to make the fork leave the testing machine platform, and lower the fork to the ground to complete the disassembly of the upper and lower molds.

[0039] Work;

[0040] 11) In the same way, move the new mold to the mold platform using the fork to complete the mold replacement.

[0041] Among them, in step 6, the front side of the mold replacement auxiliary device is a flat device for placing the mold, and the back side is 5 on each side.

[0042] A pulley without drive, the mold change auxiliary device is manually pushed and the pulley can slide freely.

[0043] Among them, in step 6, a safety pin is set on the left and right sides of the mold replacement auxiliary device to ensure that the pulley can only move forward and backward without shaking left and right, thereby ensuring that the auxiliary device will not fall off the fork, ensuring the safety of the entire action process.

[0044] Example 2: See Figure 2 , Figure 3 An auxiliary device for replacing the mold of a high-pressure forming test machine in a laboratory mainly includes: a fork 1, an auxiliary device support platform 2, a pulley 3, a safety pin 4, and an automatic forklift assembly 5, wherein the fork is connected to the automatic forklift assembly 5, wherein a pulley 3 is arranged at the bottom of the auxiliary device support platform 2, and a safety pin 4 is arranged on the left and right sides of the mold replacement auxiliary device.

[0045] It should be noted that the above embodiments are not intended to limit the protection scope of the present invention, and equivalent changes or substitutions made on the basis of the above technical solutions all fall within the protection scope of the claims of the present invention.

Claims

1. A method for replacing a die of an internal high pressure forming testing machine, characterized in that: It includes the following steps: Step 1: Shutdown for maintenance; Step 2: While ensuring safety, press the manual operation button of the testing machine to lower the upper mold frame and make it contact with the lower mold to complete the mold closing; Step 3: Remove the connecting bolts between the upper die and the upper die frame; Step 4: Press the manual operation button to raise the upper die frame to the highest position. At this time, the upper die frame is completely separated from the upper die. Step 5: Remove the connecting bolts between the lower die and the lower die mounting platform; Step 6: Place the auxiliary device for mold replacement on the existing manual forklift so that the pulley of the auxiliary device for mold replacement is located on the fork of the forklift and ensure that the pulley can slide freely on the fork; Step 7: Raise the fork to the mold height position of the testing machine platform, manually push the mold replacement auxiliary device, and move the mold replacement device on the fork through the pulley until it reaches the testing machine platform. At this time, part of the pulley of the mold replacement auxiliary device is on the testing machine platform, and part of the pulley is on the fork, ensuring that the pulley can be completely moved back to the fork; Step 8: Remove the upper and lower molds after mold closing from the mold grooves, and then place them on the mold replacement auxiliary device respectively; Step 9: Manually push the mold replacement auxiliary device to return the pulley on the testing machine platform to the fork; Step 10: Pull the forklift back to make the fork leave the testing machine platform, and lower the fork to the ground to complete the disassembly of the upper and lower molds; Step 11: Use the same method to move the new mold to the mold platform using the fork to complete the mold replacement.

2. The die replacement method of the internal high pressure forming testing machine according to claim 1, characterized in that: In step 6, the front of the mold replacement auxiliary device is a flat device on which the mold is placed, and the back is 5 undriven pulleys on the left and right. The mold replacement auxiliary device is pushed manually and the pulleys can slide freely.

3. The die replacement method of the internal high pressure forming testing machine according to claim 1, characterized in that: In step 6, a safety pin is provided on each of the left and right sides of the mold replacement auxiliary device.

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