A bidirectional scroll back pressure forming device and a forming process thereof

Abstract

This invention relates to the field of scroll plate back-pressure forming technology, specifically to a bidirectional scroll plate back-pressure forming device and its forming process. The device includes a die, a punch, a back-pressure body, a push rod, a top plate, and a hydraulic cylinder. The back-pressure body is slidably installed inside the die, and the bottom of the back-pressure body is connected to the top plate. A push rod is fixedly installed at the bottom of the top plate and is fixedly connected to the output end of the hydraulic cylinder. A detection component is fixedly installed at the bottom of the die. The detection component is used to detect the clearance between the back-pressure body and the die. The detection component includes a stationary ring fixedly installed at the bottom of the die, a moving ring slidably installed on the inner wall of the stationary ring, and a top plate fixedly installed at the bottom of the moving ring. This invention uses the stationary ring, the moving ring, and the top plate to enclose the back-pressure body in a sealed space. By injecting gas into this space, the pressure inside the sealed space increases. The pressure value fed back by a pressure detector is used to determine the clearance error between the back-pressure body and the die, thus solving the problem of difficulty in detecting the clearance between the back-pressure body and the die.

Description

Technical Field

[0001] This invention relates to the field of scroll plate back pressure forming, specifically to a bidirectional scroll plate back pressure forming device and its forming process. Background Technology

[0002] As a key component of automobiles, automotive air conditioning plays a crucial role in automobile production and sales. The core of the air conditioning system is the refrigeration compressor. With increasing international demands for energy conservation, emission reduction, and lightweighting in automobiles, hybrid compressors installed in new energy vehicles are receiving more and more attention due to their numerous advantages, such as light weight, low noise, and long lifespan. The scroll plate, as a core component of the hybrid compressor, directly affects the proper functioning of the automotive air conditioning system.

[0003] The processing of scroll disks mainly involves extrusion forming. Due to the thin and uneven wall thickness of the scroll disks, the speed of the metal entering the scroll disk cavity varies greatly, resulting in a large difference in surface height of the finished scroll disk. Therefore, a back pressure device is installed at the bottom of the forming die, and a back pressure body die is added in the metal extrusion direction to assist in the forming of the scroll disk.

[0004] However, during the back pressure body assisted forming process, the aluminum alloy pushes the back pressure body downwards under the pressure of the upper die, causing it to rub against the cavity. After forming is completed, when the back pressure body returns to its original position, it rubs against the cavity again. Thus, after prolonged use, the contact surface between the back pressure body and the cavity will inevitably wear down, resulting in defects such as burrs and flash during scroll forming. Furthermore, the wear between the scroll and the cavity is not easily observed proactively; workers only react passively when defects are found in the formed scrolls during random inspections, but by then, the entire batch of finished scrolls may have quality problems.

[0005] To address this, a bidirectional vortex disk back pressure forming device and its forming process are proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a bidirectional scroll plate back pressure forming device and its forming process. The back pressure body is wrapped by a stationary ring, a moving ring and a top plate to form a sealed space. Gas is injected into the sealed space to increase the air pressure. The fit error between the back pressure body and the die is judged by the pressure value fed back by the air pressure detector, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A bidirectional scroll plate back pressure forming device and its forming process, comprising:

[0009] Die, punch, back pressure body, ejector pin, ejector plate, hydraulic cylinder;

[0010] A back pressure body is slidably installed inside the die. A top plate is connected to the bottom of the back pressure body. A push rod is fixedly installed at the bottom of the top plate and is fixedly connected to the output end of the hydraulic cylinder.

[0011] Also includes:

[0012] A detection component is fixedly installed at the bottom of the die, and the detection component is used to detect the mating clearance between the back pressure body and the die.

[0013] Preferably, the detection assembly includes a stationary ring fixedly installed at the bottom of the die, a rotating ring slidably installed on the inner side wall of the stationary ring, a top plate fixedly installed at the bottom of the rotating ring, an air inlet pipe fixedly installed on the upper part of the side wall of the stationary ring, a sealing plate fixedly installed at the outer end of the back pressure body, the air inlet pipe extending to the sealing plate, the air inlet pipe being a flexible hose or a bamboo-joint pipe, an exhaust hole provided on the top plate, an exhaust groove provided on the push rod cooperating with the exhaust hole, a pressure detector provided at the bottom of the exhaust groove, a pressure relief hole communicating with the exhaust groove provided on the side wall of the push rod, and a solenoid valve cooperating with the pressure relief hole fixedly installed on the side wall of the push rod.

[0014] The portion of the back pressure body extending from the die is enclosed by the stationary ring, the moving ring, and the top plate, forming a relatively sealed space. The intake pipe is fixedly installed at the outer end of the back pressure body. When gas is injected into the stationary ring through the intake pipe, the gas gradually fills the internal cavity of the back pressure body along the vortex wall from the outer end of the back pressure body, causing the pressure inside the back pressure body to continuously increase. The exhaust groove on the push rod is connected to the center of the back pressure body, allowing the increased pressure inside the back pressure body to be fed back to the pressure detector in the exhaust groove. The back pressure body and the die are in a clearance fit. Under high pressure, some gas overflows from the clearance between the back pressure body and the die, but the sealed space still maintains high pressure. The pressure value fed back by the pressure detector is used to determine the wear value of the back pressure body and the die.

[0015] The air intake pipe is controlled by an external controller. After the finished scroll plate is removed, the air intake pipe exhausts gas into the stationary ring. An external display, electrically connected to a pressure detector, is located outside the extrusion die. The display contains an alarm device. A range is specified for the pressure detector. If, with a fixed volume of gas introduced, the detected pressure remains within the specified range for a certain period, it indicates that minimal gas overflow between the back pressure body and the die, suggesting that wear between them is insufficient to affect the quality of the finished scroll plate. A solenoid valve, also electrically connected to the external controller, is opened after testing to restore the air pressure in the stationary ring to normal levels for the next test.

[0016] If a large amount of gas overflows during the filling of the back pressure chamber in the air intake pipe, and the air pressure value fed back by the air pressure detector is lower than the specified value after a fixed volume of gas is introduced, the alarm device in the display will remind the staff that the wear of the back pressure body and the die is serious and needs to be replaced or other treatments are needed.

[0017] It should be noted that since the blank fills the entire die during extrusion molding, if gas is injected into the back pressure body cavity through the air inlet pipe at this time, the purpose of testing cannot be achieved. Instead, the air inlet pipe should be used to test the fitting clearance only after the finished scroll plate is removed and the back pressure body is reset.

[0018] During extrusion molding, the blank fills the die cavity under the pressure of the upper die, causing the back pressure body to move downwards a certain distance. The sealing plate fixed on the back pressure body also moves accordingly. After extrusion molding is completed, the back pressure body needs to move upwards to reset. For this reason, the air inlet pipe is designed as a bamboo joint pipe or a flexible hose to accommodate the vertical movement of the back pressure body.

[0019] If the air inlet is located outside the outer ring of the back pressure body, the vortex shape of the back pressure body makes it difficult for gas to fill the cavity, resulting in an excessive pressure difference between the outer ring and the center of the back pressure body. This causes gas to leak out from the gaps in the outer ring, reducing detection accuracy. Furthermore, it increases the time required for gas to fill the cavity, thus increasing the detection time and potentially affecting the extrusion production of the scroll plate. Positioning the air inlet at the outer ring of the back pressure body allows for better gas filling, concentrating the gas within the cavity, thus ensuring higher detection accuracy and reducing detection time.

[0020] Furthermore, an arc-shaped pipe is fixedly installed at the air outlet of the air inlet pipe.

[0021] The curvature of the arc-shaped tube is the same as that of the tail of the back pressure body. When the air is expelled from the inlet pipe, the gas is discharged along the arc-shaped tube with an initial motion angle. When the gas contacts the inner wall of the back pressure body cavity, the loss of kinetic energy is reduced, allowing the gas discharged from the inlet pipe to fill the back pressure body cavity more quickly. This avoids excessive gas concentration in a certain part of the back pressure body cavity, which would cause an excessive pressure difference within the cavity and force the gas to overflow from the gap between the back pressure body and the die. It also shortens the cavity filling time, increasing the testing speed to match existing extrusion molding production.

[0022] Compared to the air expelled from the intake pipe directly hitting the inner wall of the back pressure body cavity, the gas is more likely to concentrate at the tail end of the back pressure body cavity to form a high-pressure zone. As the volume of gas in the high-pressure zone continues to increase, the high-pressure zone gradually moves towards the center of the vortex. During this process, more gas overflows from the gap between the back pressure body and the die, increasing the time required for the gas to completely fill the back pressure body. Furthermore, when the high-pressure zone formed by the gas reaches the pressure detector at the bottom center of the back pressure body along the vortex path, the amount of gas overflowing along the way will cause the detected pressure value to vary significantly, reducing the detection accuracy of the pressure detector. In severe cases, it may cause the pressure value fed back by the pressure detector to be lower than the specified value, resulting in misjudgment.

[0023] Furthermore, the air intake velocity of the air intake pipe is between 10.8 m / s and 15.1 m / s.

[0024] The intake speed of the intake pipe is controlled at 12m / s. With the guidance of the arc-shaped pipe, the gas is continuously replenished to the center along the inner wall of the back pressure body cavity. This prevents the gas discharged from the intake pipe from hitting the inner wall of the back pressure body cavity at too high a speed, causing the gas to crash into the gap between the back pressure body and the die, resulting in unnecessary gas overflow and affecting the detection accuracy of the air pressure detector.

[0025] Furthermore, due to the vortex shape of the back pressure body, the gas needs to continuously circulate within the vortex cavity. Maintaining an intake velocity of 12 m / s is necessary to stably and quickly fill the vortex cavity. Moreover, excessively fast injection speeds through the intake pipe cannot ensure uniform gas diffusion within the vortex cavity; instead, they can lead to high-pressure zones within the vortex cavity, accelerating gas overflow and reducing the detection accuracy of the pressure detector.

[0026] Furthermore, a rectangular nozzle is fixedly installed at the outlet of the arc-shaped tube. The rectangular nozzle is divided into inner and outer layers to increase the area of ​​gas ejection from the arc-shaped tube.

[0027] As the back pressure body descends, it carries some friction debris from the die. This debris is randomly distributed in various corners of the back pressure body cavity. By increasing the air outlet area through the rectangular nozzle, the debris scattered in the back pressure body cavity is better collected in the exhaust groove of the push rod, reducing the amount of debris that re-enters the mating gap between the back pressure body and the die with the air force of the intake pipe, thus reducing wear between the back pressure body and the die.

[0028] After being guided by the arc-shaped tube, the gas is diverted through the layered structure of the rectangular nozzle, which increases the blowing area of ​​the gas while reducing the blowing speed. This means that the intake speed of the intake pipe can be increased, so that the set amount of gas can be delivered in a shorter time, shortening the time for the gas to fill the back pressure chamber and shortening the detection time of the pressure detector.

[0029] It should be noted that even if the intake velocity of the intake pipe is increased, the exhaust velocity of the rectangular nozzle still needs to be limited to between 10.8 m / s and 15.1 m / s, otherwise the situation described above will still occur.

[0030] Furthermore, a limiting block that cooperates with the rectangular nozzle is fixedly installed at the outer ring end of the back pressure body.

[0031] To ensure uniform airflow within the rectangular nozzle, its vertical height must match the diameter of the arc-shaped tube. However, the diameter of the arc-shaped tube is limited by the vortex spacing of the back pressure body. Consequently, the height of the rectangular nozzle cannot be made consistent with the height of the back pressure body extending to the top plate. The large airflow area of ​​the rectangular nozzle increases the reaction force it experiences, causing a deviation in its airflow direction. If the angle of deviation is too large, it increases the clearance of the oblique injection die of the rectangular nozzle, leading to gas overflow and reducing the detection accuracy of the air pressure detector.

[0032] Preferably, a sleeve that cooperates with the exhaust groove inside the top rod is fixedly installed in the middle of the top plate. The sleeve is divided into a fixed sleeve and a collecting sleeve. The upper part of the fixed sleeve is threaded to the top plate. A funnel is installed between the fixed sleeve and the collecting sleeve. The funnel is threaded to the lower part of the fixed sleeve. The funnel and the collecting sleeve are detachably connected. A push rod that cooperates with the air pressure detector is slidably installed at the bottom of the collecting sleeve. A sealing block that cooperates with the funnel is fixedly installed at the top of the push rod.

[0033] The outer wall of the push rod is equipped with a sealing ring, which forms a closed cavity with the collection cylinder. When the push rod is in the initial position, the sealing block is pressed against the funnel. When the air inlet pipe expels air, the air pressure causes the push rod to move downward until it contacts the air pressure detector, and the debris from the back pressure body cavity enters the funnel.

[0034] Alternatively, a spring can be installed under the push rod to press the sealing block against the funnel, achieving a sealing effect. When air is expelled from the air inlet pipe, the air pressure compresses the spring, causing the sealing block to disengage from the funnel, allowing debris to enter the funnel. The spring force only needs to be sufficient to lift the sealing block.

[0035] The solenoid valve consists of a moving valve core and a fixed sleeve. The moving valve core passes through the fixed sleeve, forming a gap between them. Due to structural design requirements and manufacturing precision limitations, this gap cannot be eliminated. When the solenoid valve is opened, the pressure in the back pressure chamber decreases, causing the push rod to move upward and re-block the funnel. This prevents debris in the gas from entering the gap, which could cause valve core jamming, reduced solenoid valve performance, and shortened service life.

[0036] The working life of the die is about 10,000 cycles. After reaching the number of cycles, the die needs to be replaced. This is because the cumulative periodic alternating deformation at the tail end of the die swirl during the long forming process can lead to fatigue fracture at the tail end of the die swirl. Therefore, when replacing the die, the sleeve can be removed to clean the debris inside.

[0037] As one of the invented methods, the rectangular nozzle extends to the middle of the back pressure body cavity.

[0038] Under normal camber conditions, wear on the back pressure body and die primarily occurs at the center of the back pressure body. This is because, during extrusion molding, the blank flows rapidly in the center of the die, making it the fastest forming and most stress-affected area. This area is prone to uneven stress on the back pressure body, increasing friction between the back pressure body and the die during its descent. Therefore, the center of the back pressure body is the area of ​​most severe friction. Wear on the outer periphery of the back pressure body is relatively less. The rectangular nozzle extends to the center of the back pressure body cavity, and thanks to the sealing effect of the sealing plate, the gas discharged from the rectangular nozzle more easily reaches the pressure detector at the center of the back pressure body cavity, enhancing its detection accuracy.

[0039] It should be noted that while extending the rectangular nozzle to the middle enhances the detection accuracy of the air pressure detector, it makes it difficult to collect debris from the periphery of the back pressure body into the sleeve. This debris may still enter the mating gap between the back pressure body and the die, causing the die to wear more rapidly.

[0040] Furthermore, an air pressure hole is provided at the outer ring end of the back pressure body.

[0041] While focusing on detecting the middle part of the back pressure body cavity, the pressure difference between the inside and outside of the back pressure body cavity is adjusted through the air pressure hole to prevent excessive pressure inside the cavity and excessive gas from overflowing into the mating gap between the back pressure body and the die.

[0042] The air pressure vent is located at the bottom of the back pressure body to ensure its strength.

[0043] Preferably, the process for forming the scroll disk is as follows:

[0044] S1: Pre-forging billet: The prepared original billet is heated to 150°C and held for 10 minutes. The original billet is then removed and coated with lubricant evenly on its surface. It is then placed in a heating furnace and heated to 470°C. After holding for 30 minutes, the original billet is placed into the pre-forging die cavity for a single positive extrusion forging. During the single positive extrusion forging process, the upper pre-forging die of the pre-forging die extrudes the original billet at a speed of 20-30 mm / s to obtain a pre-formed billet. The outer ring of the pre-formed billet is the shape of the finished product. The pre-formed billet groove on the pre-formed billet corresponds to the upper pre-forging die of the pre-forging die.

[0045] S2: Final forging: After adjusting the back pressure distance of the final forging die to the highest point, the surface of the preform in the pre-forged billet is uniformly coated with a release agent, and then it is placed into the die cavity of the final forging die. The upper die of the final forging die extrudes the preform at a speed of 10-15 mm / s. The back pressure controls the vortex forming speed and the material flow position to ensure uniform material forming, and finally forms the oil-electric hybrid static disk. The surface of the oil-electric hybrid static disk corresponds to the lower die of the final forging die, and the inner cavity of the oil-electric hybrid static disk corresponds to the upper die of the final forging die.

[0046] S3: Post-forging heat treatment involves solution treatment of the bearing housing part in the final forming process at 520℃ for 3 hours and aging at 160℃ for 10 hours. The alloy is kept in the high-temperature single-phase region for a period of time to allow the supersaturated solid solution of the alloy to fully dissolve. Then, through aging treatment, the strengthening phase is dispersed and precipitated, eliminating the distortion energy brought about by forging, and obtaining the finished oil-electric hybrid static disk.

[0047] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0048] 1. The part of the die protruding from the back pressure body is wrapped by the stationary ring, the moving ring and the top plate, forming a relatively closed space. Gas is injected into it through the air inlet pipe to increase the air pressure in the closed space. The pressure value fed back by the air pressure detector is then used to determine whether the fit clearance between the die and the back pressure body is too large.

[0049] 2. By increasing the air outlet area through the rectangular nozzle, the debris scattered in the back pressure body cavity is better collected in the exhaust groove of the push rod, reducing the amount of debris that re-enters the mating gap between the back pressure body and the die with the air force of the intake pipe, thus reducing the wear between the back pressure body and the die.

[0050] 3. Two installation options are provided for the air inlet pipe. The first option is to place the air inlet pipe at the outer end of the back pressure body cavity. Its advantages include a wider detection range for the clearance between the back pressure body and the die, and the ability to collect most debris within the sleeve during detection. However, the increased distance the gas travels leads to increased gas overflow, reducing detection accuracy. The second option is to place the air inlet pipe at the center of the back pressure body. Its advantages include making it easier for the gas discharged from the rectangular nozzle to reach the pressure detector at the center of the back pressure body cavity, reducing gas overflow and enhancing detection accuracy. However, debris from the periphery of the back pressure body is difficult to collect within the sleeve, and this debris may still enter the clearance between the back pressure body and the die, accelerating die wear. Attached Figure Description

[0051] Figure 1 This is an overall structural diagram of Embodiment 1 or Embodiment 2 of the present invention;

[0052] Figure 2 This is a diagram of the internal structure of the stationary ring in Example 1;

[0053] Figure 3 for Figure 2 A bottom view;

[0054] Figure 4 for Figure 3 Enlarged view at point D;

[0055] Figure 5 This is a cross-sectional view of the overall structure of Embodiment 1 or Embodiment 2;

[0056] Figure 6 for Figure 5 Enlarged view at point B in the middle;

[0057] Figure 7 This is a partial sectional view of Embodiment 1 or Embodiment 2;

[0058] Figure 8 for Figure 7 Enlarged view at point C;

[0059] Figure 9 This is a structural diagram of the rectangular nozzle from Example 1 or Example 2;

[0060] Figure 10 This is a diagram of the internal structure of the stationary ring in Example 2;

[0061] Figure 11 for Figure 10 Enlarged view of point A in the middle.

[0062] In the diagram: 1. Die; 2. Stationary ring; 3. Top plate; 4. Push rod; 5. Air inlet pipe; 6. Back pressure body; 7. Solenoid valve; 201. Moving ring; 202. Sealing ring; 301. Fixed cylinder; 302. Collection cylinder; 303. Sealing block; 304. Push rod; 305. Air pressure detector; 401. Pressure relief hole; 501. Sealing plate; 502. Arc-shaped pipe; 503. Rectangular nozzle; 504. Limiting block; 601. Air pressure hole. Detailed Implementation

[0063] Please see Figures 1 to 11 This invention provides a bidirectional scroll disk back pressure forming device and its forming process, the technical solution of which is as follows:

[0064] A bidirectional scroll plate back pressure forming device and its forming process, comprising:

[0065] Die 1, punch, back pressure body 6, ejector pin 4, ejector plate 3, hydraulic cylinder;

[0066] A back pressure body 6 is slidably installed inside the die 1. A top plate 3 is connected to the bottom of the back pressure body 6. A push rod 4 is fixedly installed at the bottom of the top plate 3. The push rod 4 is fixedly connected to the output end of the oil cylinder.

[0067] Example 1

[0068] Before production begins, screw the sleeve into the top plate 3 and control the push rod 4 to accurately align the venting groove in the push rod 4 with the sleeve.

[0069] The soft material of the sealing plate 501 can be displaced upward by an additional 0.1 to 0.2 mm when the ejector rod 4 resets, ensuring the airtightness of the back pressure body cavity. The mold temperature is controlled at 220°C, and the billet temperature is controlled at 410°C. After the first piece is extruded by the scroll plate, air is introduced into the back pressure body 6 cavity at a speed of 12 m / s. After air is introduced through the air inlet pipe 5, the air pressure detected at the air pressure detector 305 is, for example, 1 MPa when 10 L of air is introduced. The air pressure measured after the first scroll plate is produced is set as reference value one. Then, while keeping the above conditions unchanged, the equipment used to produce the first scroll plate is used to continuously produce scroll plates until the wear of the back pressure body 6 and the die 1 affects the quality of the finished scroll plate. At this time, the air pressure after the air inlet pipe 5 is vented is set as reference value two. Therefore, it can be considered that if the pressure value measured after extrusion and testing is between reference value one and reference value two, it is considered that the wear of the back pressure body 6 and the die 1 is insufficient to affect the forming of the scroll plate. If the pressure value measured after extrusion is greater than reference value two, it is considered that the wear gap between the back pressure body 6 and the die 1 is too large, affecting the extrusion forming of the scroll plate.

[0070] The production interval for vortex disc extrusion forming is 5 seconds. After forming is completed and the finished vortex disc is removed, the intake pipe 5 begins to exhaust gas into the stationary ring 2. The curvature of the arc-shaped pipe 502 is the same as the curvature of the tail of the back pressure body 6. The gas enters the cavity of the back pressure body 6 along the arc-shaped pipe 502. When passing through the rectangular nozzle 503, it is diverted and the air outlet area is expanded, so that the set amount of gas can be delivered in a shorter time, shortening the time for gas to fill the cavity of the back pressure body 6 and shortening the detection time of the pressure detector. When gas enters the sleeve along the back pressure body 6 cavity, debris scattered in the back pressure body 6 cavity also enters along with the gas. At this time, the push rod 304 moves downward under the action of air pressure, causing the sealing block 303 to disengage from the funnel, and the debris falls into the funnel. At the same time, the push rod 304 contacts the air pressure detector 305, feeding back the air pressure to the air pressure detector 305. The air pressure detector 305 is electrically connected to the display, which is equipped with an alarm device. If a lot of gas overflows during the filling of the back pressure body 6 cavity by the air inlet pipe 5, and the air pressure value fed back by the air pressure detector 305 is lower than the specified value after a fixed volume of gas is introduced, the alarm device in the display will remind the staff that the wear between the back pressure body 6 and the die 1 is serious and needs to be replaced or other treatments are needed. If the detected pressure value is within the specified range for a certain period of time, it means that there is less gas overflowing between the back pressure body 6 and the die 1, and it can be judged that the wear between the back pressure body 6 and the die 1 will not affect the quality of the finished scroll plate. Solenoid valve 7 is electrically connected to an external controller. After the test is completed, solenoid valve 7 is opened to restore the air pressure in static ring 2 to the normal level, in preparation for the next test.

[0071] Example 2

[0072] Unlike Embodiment 1, the rectangular nozzle 503 extends to the middle of the back pressure body 6 cavity. Under the premise of normal engagement between the punch and die 1, the wear of the back pressure body 6 and the die 1 mainly occurs in the middle of the back pressure body 6. This is because, during the extrusion molding process, the blank flows faster in the middle of the die 1, which is also the area with the fastest forming and the most stress. The blank in this area is prone to uneven stress on the back pressure body 6, which increases the friction between the back pressure body 6 and the die 1 during the downward movement. Therefore, the middle of the back pressure body 6 is the area with the most severe friction. The wear on the periphery of the back pressure body 6 is relatively much smaller. The rectangular nozzle 503 extends to the middle of the back pressure body 6 cavity. Relying on the sealing effect of the sealing plate 501, the gas discharged from the rectangular nozzle 503 can more easily reach the air pressure detector 305 in the center of the back pressure body 6 cavity, enhancing its detection accuracy.

[0073] It should be noted that although the rectangular nozzle 503 extends to the middle, which enhances the detection accuracy of the air pressure detector 305, it makes it difficult for debris on the periphery of the back pressure body 6 to be collected into the sleeve. These debris may still enter the mating gap between the back pressure body 6 and the die 1, causing the die 1 to wear more rapidly.

[0074] Example 3

[0075] The inability to discharge debris generated by the wear between the back pressure body 6 and the die 1 is a major reason for the continuous increase in the clearance between the back pressure body 6 and the die 1.

[0076] If, after the work is completed, the air inlet pipe 5 is used to continuously draw air into the cavity of the back pressure body 6, the negative pressure generated in the cavity of the back pressure body 6 will cause the external gas to continuously enter the mating gap between the back pressure body 6 and the die 1, so that the debris in the mating gap is pushed into the cavity of the back pressure body 6 by the external air pressure. When the air is expelled through the air inlet pipe 5 for testing, the debris is blown into the sleeve for collection, thereby increasing the service life of the die 1.

Claims

1. A bidirectional scroll plate back pressure forming device, comprising: The components include a die (1), a punch, a back pressure body (6), a push rod (4), a top plate (3), and a hydraulic cylinder; the back pressure body (6) is slidably installed inside the die (1), the bottom of the back pressure body (6) is connected to the top plate (3), the bottom of the top plate (3) is fixedly installed with a push rod (4), and the push rod (4) is fixedly connected to the output end of the hydraulic cylinder; the component is characterized by further including a detection assembly, the bottom of the die (1) is fixedly installed with a detection assembly, and the detection assembly is used to detect the fitting clearance between the back pressure body (6) and the die (1); The detection assembly includes a stationary ring (2) fixedly installed at the bottom of the die (1), a moving ring (201) slidably installed on the inner side wall of the stationary ring (2), a top plate (3) fixedly installed at the bottom of the moving ring (201), an air inlet pipe (5) fixedly installed on the upper side wall of the stationary ring (2), a sealing plate (501) fixedly installed at the tail end of the back pressure body (6), the air inlet pipe (5) extending to the sealing plate (501), the air inlet pipe (5) being a flexible hose or a bamboo tube, an exhaust hole opened on the top plate (3), an exhaust groove opened on the top rod (4) cooperating with the exhaust hole, a pressure detector (305) provided at the bottom of the exhaust groove, a pressure relief hole (401) communicating with the exhaust groove opened on the side wall of the top rod (4), and a solenoid valve (7) cooperating with the pressure relief hole (401) fixedly installed on the side wall of the top rod (4); A sleeve that cooperates with the exhaust groove in the top rod (4) is fixedly installed in the middle of the top plate (3). The sleeve is divided into a fixed cylinder (301) and a collecting cylinder (302). The upper part of the fixed cylinder (301) is threadedly connected to the top plate (3). A funnel is installed between the fixed cylinder (301) and the collecting cylinder (302). The funnel is threadedly connected to the lower part of the fixed cylinder (301). The funnel and the collecting cylinder (302) are detachably connected. A push rod (304) that cooperates with the air pressure detector (305) is slidably installed at the bottom of the collecting cylinder (302). A sealing block (303) that cooperates with the funnel is fixedly installed at the top of the push rod (304). A spring is set under the push rod (304). The sealing block (303) is pressed against the funnel by the spring to achieve a sealing effect. When the air inlet pipe (5) exhales, the air pressure compresses the spring, and the sealing block (303) is disengaged from the funnel, so that the debris can enter the funnel.

2. The bidirectional scroll plate back pressure forming equipment according to claim 1, characterized in that: An arc-shaped tube (502) is fixedly installed at the outlet of the air inlet pipe (5). The arc-shaped tube (502) is used to change the direction of gas entering the back pressure body (6) cavity.

3. The bidirectional scroll plate back pressure forming equipment according to claim 2, characterized in that: The intake velocity of the intake pipe (5) is between 10.8 m / s and 15.1 m / s.

4. The bidirectional scroll plate back pressure forming equipment according to claim 2, characterized in that: A rectangular nozzle (503) is fixedly installed at the outlet of the arc-shaped tube (502). The rectangular nozzle (503) is divided into inner and outer layers to increase the area of ​​gas ejection from the arc-shaped tube (502).

5. The bidirectional scroll plate back pressure forming equipment according to claim 4, characterized in that: The outer ring end of the back pressure body (6) is fixedly installed with a limiting block (504) that cooperates with the rectangular nozzle (503).

6. The bidirectional scroll plate back pressure forming equipment according to claim 4, characterized in that: The rectangular nozzle (503) extends to the middle of the back pressure body (6) cavity.

7. The bidirectional scroll plate back pressure forming equipment according to claim 2, characterized in that: The back pressure body (6) has an air pressure hole (601) at the outer ring end; the air pressure hole (601) is used to adjust the pressure difference between the inside and outside of the cavity of the back pressure body (6) to prevent the pressure inside the cavity from being too high and to prevent too much gas from overflowing into the gap between the back pressure body (6) and the die (1).

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