WO2013166875A1

WO2013166875A1 - Supporting auxiliary equipment for forming three-way part

Info

Publication number: WO2013166875A1
Application number: PCT/CN2013/071969
Authority: WO
Inventors: 李镇南
Original assignee: Li Zhennan
Priority date: 2012-05-09
Filing date: 2013-02-28
Publication date: 2013-11-14
Also published as: CN102699176A

Abstract

Disclosed is supporting auxiliary equipment for forming a three-way part. A three-way workpiece to be machined is extruded in a main tubular cavity (2) of a mold cavity, such that the workpiece is pushed to extend within a branch tubular cavity (3) and form a three-way branch pipe. A support rod (4) is arranged within the branch tubular cavity, and the support rod is driven by an oil cylinder (12). One end of the support rod is pushed by the piston rod (14) of the oil cylinder and bears against the pipe wall of the workpiece forming a branch pipe port, and slides within the branch tubular cavity when the branch pipe is formed. During the sliding process of the support rod, the oil cylinder always outputs a supporting force with a constant value to the support rod. The oil flow system of the oil cylinder comprises an oil pump (9), a three-position four-way directional control valve (10), a pressure-regulating valve (7), and a two-position two-way valve (6). The supporting auxiliary equipment for forming the three-way part is capable of enabling a finished three-way product to have a higher forming quality, so that the finished products are of good consistency, and the capacity of the products is increased.

Description

Three-way forming support auxiliary equipment

Technical field

The present invention relates to the field of metal pipe processing, and more particularly to a support assisting device for three-way extrusion forming.

Background technique

The tee is a pipe connection. Also known as pipe tee, tee pipe fittings or tee fittings, three general purpose in the main pipe branch, wide use, wide industry, wide application range. In the field of refrigeration, the common three-way copper is made. The traditional copper tee is mainly made by the method of filling lead. The production process of the three-way is easy to cause the human body to contact with lead. Causes serious harm. Another method of processing copper tee is to replace lead with other solid medium, and inject it into the tee, but as the extrusion medium of the tee, it must have a certain ductility, and the shape can flow like a liquid. , change, and has not yet found a suitable alternative to lead and environmentally friendly solid extrusion media.

In order to solve this problem, the applicant applied for an invention patent of the three-way forming die and the three-way forming method on December 21, 2010, and provided a branch pipe cavity and a support rod in the forming die, through high-pressure water. The wall of the tee workpiece is extruded to form a tee branch in the tee branch lumen. After that, a more ideal three-way forming method is proposed, that is, after the high-pressure water is filled into the workpiece to be processed, the workpiece is further pressed by the thimble to force plastic deformation, and the material is delayed, specifically: The thimble step is pressed in the direction of the three-way, and together with the high-pressure water in the three-way workpiece, the copper material of the tee main pipe is forced to the branch cavity. During the forming process of the branch pipe, an auxiliary support rod is usually added to the branch pipe. The support rod provides support to the pipe wall of the branch pipe forming port and moves in the branch pipe cavity as the branch pipe rises and changes, without the support of the support rod, When the branch pipe rises, it is easy to rise and break. In order to support the support rod with a certain pressure value, the applicant has tried to use spring or high-strength rubber elastic parts at one end of the support rod to form a certain resistance when forming the branch tube to prevent the extrusion from breaking. However, it has been found that the magnitude of the elastic supporting force provided by the above technical solution is constantly changing, especially the spring, which changes rapidly with the degree of deformation, which is disadvantageous to the appearance quality of the three-way forming, and the wall unevenness often occurs. Summary of the invention

The technical problem to be solved by the present invention is to provide a spurt for the deficiencies of the above prior art. The three-way pipe fittings have good consistency, high pass rate, good quality and uniform three-way forming support auxiliary equipment, which makes the finished product beautiful in appearance, uniform in inner diameter and good in consistency of finished products.

The technical solution adopted by the invention is a three-way forming support auxiliary device, wherein the three-way workpiece to be processed is squeezed in the main cavity of the cavity, and the workpiece is pushed in the branch cavity to form a three-way branch pipe, in the branch cavity The support rod is disposed, the support rod is driven by the oil cylinder, and one end of the support rod is pushed by the piston rod of the oil cylinder, abuts against the tube wall of the branch pipe forming portion of the workpiece, and slides in the branch tube cavity when the branch tube is formed. During the sliding process of the support rod, the oil cylinder always outputs a support force with a constant force value to the support rod; the oil passage system of the oil cylinder includes an oil pump, a three-position four-way reversing valve, a pressure regulating valve, and a two-position two-way valve.

The rod chamber port of the oil cylinder is connected to the d port of the three-position four-way reversing valve, and the rodless chamber port of the oil cylinder is connected with the pressure regulating valve and the c port of the three-position four-way reversing valve, the three positions The e port of the four-way reversing valve is connected to the oil pump and the two-position two-way valve, and the f port of the three-position four-way reversing valve is connected to the fuel tank.

The rodless cavity port of the cylinder is connected to the accumulator.

The rod chamber port of the oil cylinder is connected with a throttle speed regulating valve, and the throttle speed regulating valve is connected to the d port of the three-position four-way reversing valve.

When the two-position two-way valve is energized, the three-position four-way reversing valve is powered off.

When the 2/2-way valve is de-energized, the a coil or the b coil of the three-position four-way reversing valve is energized. Compared with the prior art, the present invention has the following advantages:

The invention is connected to the support rod of the three-way forming die by the piston rod of the oil cylinder, and the oil circuit system can realize a constant transmission force to the support rod. When the ejector pin presses the three-way workpiece, the support rod assists the thimble to form the branch tube. Through the control of oil pressure and feed flow rate, the cylinder maintains a constant value of the reverse force of the support rod, so that the three-way finished product has higher appearance quality, the finished product has good consistency, and the three-way U-bend transition is smooth, The outer diameter of the three links can meet the requirements of equal diameter, reduce the production process, reduce the difficulty of the production process, and improve the quality and productivity of the product.

The three-way forming support auxiliary device of the invention can accurately control the three steps of the support rod in the three-way forming process by a simple and effective oil circuit system: the one-way three-way branch pipe is pulled in the branch pipe cavity against the branch pipe wall ——The support rod is retracted, the whole process is smooth and powerful, efficient and reliable, the equipment structure is simple, the cost is low, and the copper cylinder can be produced efficiently and quickly with the extrusion master cylinder.

DRAWINGS

1 is a schematic view showing the structure of an oil passage of a three-way forming support auxiliary device of the present invention; 2 is a schematic view showing the connection between the oil cylinder and the support rod of the three-way forming support auxiliary device of the present invention; FIG. 3 is a schematic view showing the operation of the support rod according to the first embodiment of the present invention;

4 is a schematic view showing the operation of a support rod according to a second embodiment of the present invention;

Figure 5 is a schematic view showing the operation of the support rod of the third embodiment of the present invention.

detailed description

The invention will be further described below by way of specific embodiments with reference to the accompanying drawings.

The three-way extrusion forming equipment is completed by the main equipment and the supporting auxiliary equipment. The main equipment is filled with the main extrusion medium (normal pressure and high pressure liquid) through the thimble after the mold is clamped and clamped. Water), then the thimble is further advanced to squeeze the workpiece. When the extrusion pressure is greater than the plastic deformation stress limit of the copper material, the support force of the high pressure water and the support rod cooperate to force the workpiece copper to be deduced to the branch pipe cavity. First, let's briefly describe the structure of each part of the main device:

The main equipment includes a hydraulic machine, a side cylinder, a thimble, and a control system. The forming die is composed of an upper die and a lower die. The upper die is installed on the upper cylinder of the hydraulic machine and is controlled to travel up and down in the vertical direction by the control system. The lower die is placed on the hydraulic machine platform, and the ejector pin is used to clamp the fixed workpiece by the upper and lower molds. The two main ports are completely sealed, and a filling process is performed to extrude the three-way workpiece to form the workpiece into a tee. The ejector pin is an elongated metal rod which is hollow to form a liquid passage lumen, and the end is provided with a thimble boss for pressing the tee. The upper and lower molds are respectively symmetrically arranged with semi-circular grooves. When the upper and lower molds are closed, the upper and lower molds are surrounded by a cavity for accommodating the three-way pipe fitting, and the cavity is adapted to the shape of the three-way pipe. The forming cavity further comprises a branch cavity for forming the branch pipe, which communicates with the cavity of the tee pipe and opens at the branch pipe forming portion, the support rod 4 moves in the branch pipe cavity, and the support rod moves by the supporting auxiliary device drive. Referring to Fig. 3, it is a schematic view of the lower mold structure of the first embodiment (Y-shaped three-way). The lower mold 1 is provided with a main cavity half 2, and the main cavity half 2 is a U-shaped semicircular groove, which is closed with the semicircular groove of the upper mold. A U-shaped main cavity having a circular cross section is formed. The root of the main chamber half 2 communicates with the branch chamber half chamber 3, and is closed with the branch tube half chamber of the upper mold to form a branch chamber having a circular cross section. The support rod 4 is disposed in the branch half chamber 3, and the support end of the support rod 4 is a circular table 41 whose outer diameter is adapted to the inner diameter of the lumen of the branch lumen 3. Referring to Fig. 4, there is shown a schematic view of the lower mold structure of the second embodiment (T-shaped tee). The lower mold 21 is provided with a main pipe half chamber 22 and a branch pipe half chamber 23, and the support rod 4 is disposed in the branch pipe half chamber 23. Referring to Fig. 5, there is shown a schematic view of the lower mold structure of the third embodiment (U-shaped three-way). The lower mold 31 is provided with a main pipe half chamber 32 and a branch pipe chamber 33, and the support rod 4 is disposed in the branch pipe cavity 33.

The three-way forming support auxiliary device includes a cylinder, an oil passage control system, and a support rod. The main equipment forming process is as follows: The upper mold moves downward and the lower mold is closed, and the tee workpiece is clamped in the main chamber. The master cylinder also provides a clamping force to the upper die to hold the upper die and the lower die in place. When the workpiece is placed in a cavity formed by the upper mold and the lower mold, the cylinder pushes the support rod to the wall of the branch forming port of the workpiece to be processed.

The side cylinder is advanced, and the thimble is inserted into the main pipe. The water injection system injects the normal pressure water into the three-way workpiece through the liquid pipe cavity. The filling of the squeezing medium is completed and the air in the tee workpiece is emptied. The thimble continues to be inserted into the main lumen of the three-way workpiece. When in the set position, the boosting cylinder of the water injection system works, the liquid storage cylinder of the water injection system communicates with the liquid passage lumen of the thimble, and the water is pressurized by the booster cylinder from the thimble The liquid-passing lumen enters the three-way lumen, so that the water pressure in the copper tee is simultaneously increased, the copper tee main pipe slightly rises under the action of water pressure, and the main port is pressed to form a seal on the outer wall of the thimble.

The side cylinder continues to advance, pushing the ejector step against the three-way main port, and continuing to squeeze toward the three-way branch end, and cooperating with the high-pressure water in the three-way workpiece to force the copper material of the three-way main pipe to be pushed to the branch pipe cavity. When the support cylinder transmits a support force F1 for maintaining a constant force value to the support rod, the thrust force F2 of the thimble is greater than the support force F1 of the support rod, and the support rod is retracted into the branch tube in the support cavity. In this step, the thrust of the thimble is

30t~ 100t (t means weight per ton). The support pressure provided by the support rod is 5~100 MPao. The booster cylinder stops working. The water injection system injects the normal pressure water into the three-way, the side cylinder relieves the pressure to make the ejector retract, the support rod retreats and resets, the upper mold goes up, and the three-way is taken out. Workpiece.

The working process of the driving cylinder of the support rod will be described below with reference to Fig. 1 and Fig. 2:

One end of the support rod 4 is coupled to the piston rod 14 of the cylinder 12 through a flange, and the other end extends into the branch chamber cavity when the piston rod of the cylinder moves back and forth. The piston rod 14 of the oil cylinder divides the oil cylinder 12 into two chambers, a rod chamber 15 and a rodless chamber 13. The oil chambers are connected to the oil passages on both chambers. The port with the rod cavity is connected with the throttle speed regulating valve, the d port of the three-position four-way reversing valve, and the accumulator 8 and the pressure regulating valve 7 and the three-position four-way reversing valve 10 are connected to the port of the rodless cavity. The c port, the e port of the three-position four-way reversing valve is connected to the oil pump and the two-position two-way valve 6, and the f port of the three-position four-way reversing valve is connected to the fuel tank 5. The oil pump 9 draws oil from the oil tank 5, and the oil in the 2/2-way valve 6 and the pressure regulating valve 7 can also flow into the oil tank 5. Referring to Table 1, the equipment starts to run, the oil pump works. After the upper and lower molds are closed, the a coil of the three-position four-way reversing valve 10 is energized, the oil ports e and c are connected, and the oil ports d and f are connected. The oil enters the rodless cavity, and the oil of the rod cavity is returned to the oil tank through the throttle speed regulating valve, and the piston rod pushes the support rod to move in the branch pipe cavity to abut against the forming portion of the branch pipe of the workpiece to be processed, at this time, the piston rod The stroke is limited and the piston rod stroke is cut off. When the branch pipe is formed, the £1 and b coils of the three-position four-way reversing valve 10 are powered down, and the two-position two-way valve 6 is energized. The oil coming out of the pump does not enter the oil cylinder. From the 2nd position 2nd valve 6 to the oil tank 5, the support rod transmits the pressing force of the main equipment to the piston rod, and the piston rod retreats toward the rodless chamber, because the oil port of the rodless chamber is still Connect the pressure regulating valve 7, so that the oil pressure of the road can maintain the pressure set by the pressure regulating valve. When the pressure is too high, the oil returns from the pressure regulating valve 7 to the oil tank, thus causing the piston rod to provide a constant force value to the support rod. The reaction. When the three-way branch pipe is formed and the support rod needs to be retracted from the branch pipe cavity to the initial position, the two-position two-way valve 6 is de-energized, and the a-coil of the three-position four-way reversing valve 10 is powered off, and the b-coil is electrified. The ports e and d are connected, the ports c and f are connected, the oil enters the rod chamber, and the oil without the rod chamber is returned from the pressure regulating valve 7 to the tank. In the process, the pressure regulating valve is installed in the system. 7. The tension applied to the support rod is also constant. The accumulator 8 makes the oil in the rodless chamber more stable, overcomes the shortcomings of the oil pump imbalance, and makes the system more stable. The throttle speed regulating valve 11 is regulated by the back pressure throttle to maintain a certain flow velocity of the oil passage of the rod cavity, and the piston rod is gradually and stably advanced.

Valve status table at each stage

Retaining the 2nd 2-way valve (-) (-) (-) three-position four-way reversing valve (a+), (b-) (a-), (b-) (a) against the branch pipe branch support rod —) , (b+) Note: (+) means the valve is energized, (1) means the valve is powered down, a, b means the coil

Claims

claims

1. A kind of tee forming support auxiliary equipment. The workpiece to be processed in the tee is squeezed in the main cavity of the mold cavity, prompting the workpiece to be pushed in the branch pipe cavity to form the tee branch pipe. A support rod is set in the branch pipe cavity. The characteristic is: the support rod is driven by an oil cylinder, and one end of the support rod is pushed by the piston rod of the oil cylinder, abuts against the wall of the branch pipe opening of the workpiece and slides in the branch pipe cavity when the branch pipe is formed. During the sliding process of the rod, the oil cylinder always outputs a constant supporting force to the support rod; the oil circuit system of the oil cylinder includes an oil pump, a three-position four-way reversing valve, a pressure regulating valve, and a two-position two-way valve.

2. The tee forming support auxiliary equipment according to claim 1, characterized in that: the rod cavity oil port of the oil cylinder is connected to the d port of the three-position four-way reversing valve, and the rodless cavity oil port of the oil cylinder Connect the pressure regulating valve and the c port of the three-position four-way reversing valve. The e-port of the three-position four-way reversing valve is connected to the oil pump and the two-position two-way valve. The f port of the three-position four-way reversing valve is connected. tank.

3. The tee forming support auxiliary equipment according to claim 2, characterized in that: the rodless cavity oil port of the oil cylinder is connected to an energy storage device.

4. The three-way forming support auxiliary equipment according to claim 2 or 3, characterized in that: the rod cavity oil port of the oil cylinder is connected to a throttle speed regulating valve, and the throttle speed regulating valve is connected to a three-position four-way d Π of the reversing valve.

5. The three-way forming support auxiliary equipment according to claim 4, characterized in that: when the two-position two-way valve is powered on, the three-position four-way reversing valve is powered off.

6. The three-way forming support auxiliary equipment according to claim 5, characterized in that: when the two-position two-way valve is powered off, the a coil or b coil of the three-position four-way valve is powered.