Auxiliary mold splitting equipment for automobile covering part

Abstract

The invention discloses auxiliary mold splitting equipment for an automobile covering part, and relates to the technical field of automobile mold splitting, the auxiliary mold splitting equipment comprises a supporting cylinder body mounted on a lower mold base, a jacking guide column slidably and hermetically connected in the supporting cylinder body, and an execution unit connected with a liquid path of the supporting cylinder body; an elastic sleeve capable of shrinking or expanding in the radial direction is arranged on the periphery of the jacking guide column in a sealed and sleeved mode, so that an expansion cavity is formed between the jacking guide column and the elastic sleeve, and an expansion runner is formed in the jacking guide column in a penetrating mode and used for communicating the lower cavity space of the supporting cylinder body with the expansion cavity; the execution unit is configured to receive fluid discharged by the supporting cylinder body and build back pressure in the mold closing stage so as to generate damping force used for buffering mold closing impact, and meanwhile the elastic sleeve is driven to expand in the radial direction through the expansion flow channel so as to lock and guide. And in the mold splitting stage, the stored pressure fluid is released to the lower cavity of the supporting cylinder body, and the jacking guide column is driven to jack the upper mold base after the pressure fluid in the expansion cavity is discharged. The mold splitting device has the effect of improving the mold splitting efficiency.

Description

Technical Field

[0001] This application relates to the technical field of mold parting for automobiles, and in particular to an auxiliary mold parting device for automobile body panels. Background Technology

[0002] Automotive body panels are stamped metal sheet parts that form the shape of the car body and driver's cab. They mainly include the car floor, engine hood, door outer panels, roof, and side panel outer panels. These parts play an important role in sealing the car body, protecting the internal engine and chassis components, and absorbing energy in a collision to protect passenger safety. They are usually characterized by large size, complex shape, many curvature changes, and high surface quality requirements.

[0003] Currently, the production of automotive body panels mainly relies on large cold stamping dies for mass production on mechanical presses or hydraulic presses. The conventional cold stamping process first places the sheet metal on the lower die, and then the press drives the upper die to descend at high speed to close with the lower die. During this process, the guide pillars and guide sleeves inside the die first contact and guide the upper and lower dies to be precisely aligned. The die performs operations such as drawing, trimming, punching or shaping on the metal sheet metal. After forming, the press drives the upper die to rise, and the upper die separates from the lower die to remove the finished product.

[0004] During the mold closing and forming stage, especially at the moment when the upper mold contacts the sheet metal, a huge vertical impact force and lateral thrust are generated. In order to resist the lateral force and prevent mold misalignment from causing the cutting edge to chip or the forming surface to be scratched, theoretically, the fit clearance between the guide pillar and the guide sleeve should be as small as possible. During the mold parting stage, due to the tight closure between the mold surfaces, a huge vacuum suction force and oil film tension will be formed between the upper and lower molds. The huge suction force often causes the upper mold to produce a slight elastic deformation or tilt when it moves upward. At this time, if the fit clearance between the guide pillar and the guide sleeve is too small, the slight tilt of the upper mold will cause the guide pillar and the guide sleeve to interfere, resulting in seizing or tearing, which will seriously affect the processing progress. Summary of the Invention

[0005] To address the aforementioned technical problems, this application provides an auxiliary parting device for automotive body panels.

[0006] This application provides an auxiliary parting device for automotive body panels, employing the following technical solution: An auxiliary mold-separation device for automotive body panels includes a support cylinder mounted on a lower mold base, a lifting guide column slidably and sealed within the support cylinder, and an execution unit connected to the hydraulic circuit of the support cylinder. The lifting guide post is used to guide the upper mold base by engaging with the guide sleeve. The lifting guide column is sealed on its outer periphery and coaxially fitted with an elastic sleeve that can contract or expand radially to form an expansion cavity between the lifting guide column and the elastic sleeve. An expansion flow channel is opened through the lifting guide column to connect the lower cavity space of the support cylinder with the expansion cavity. The execution unit is configured to: receive the fluid discharged from the support cylinder and establish back pressure during the mold closing stage to generate damping force to buffer the mold closing impact, while driving the elastic sleeve to expand radially through the expansion channel to lock the guide; during the mold parting stage, release the stored pressure fluid to the lower cavity of the support cylinder, discharge the pressure fluid in the expansion cavity, and then drive the lifting guide post to lift the upper mold base.

[0007] Optionally, the elastic sleeve is made of elastic metal and is an annular thin-walled component. Multiple non-through expansion grooves are spaced along the axial direction on the outer wall surface of the elastic sleeve. The depth of the expansion grooves is less than the wall thickness of the elastic sleeve, so that the inner wall of the elastic sleeve remains completely sealed. An annular mounting groove is provided on the outer wall surface of the lifting guide post. The elastic sleeve is correspondingly and sealingly covered around the mounting groove of the lifting guide post, so that the expansion cavity is closed.

[0008] Optionally, the execution unit includes an accumulator and a hydraulic control module that connects the support cylinder and the accumulator via a hydraulic circuit; The hydraulic control module includes a damping branch and a power supply branch connected in parallel. The damping branch is configured to allow pressurized fluid to flow only from the support cylinder to the accumulator and is equipped with a throttling element to generate back pressure. The power supply branch is configured to allow pressurized fluid to flow only from the accumulator to the main cylinder and has a flow capacity greater than that of the damping branch.

[0009] Optionally, the hydraulic control module further includes an overflow branch, one end of which is connected to the damping branch and / or the power supply branch, and the other end is used to connect to an external oil tank. When the internal pressure of the damping branch or the power supply branch exceeds a preset safety threshold, the overflow branch opens to unload.

[0010] Optionally, the execution unit further includes a flow direction control module, which is located at the opening at the bottom of the support cylinder for hydraulic fluid to enter and exit. The flow direction control module is configured to: connect the lower cavity of the support cylinder and the expansion cavity using pressure difference to perform fluid filling and expansion when hydraulic fluid flows out of the support cylinder during the mold closing stage; and cut off the passage between the lower cavity of the support cylinder and the expansion cavity using pressure difference when hydraulic fluid flows into the support cylinder during the mold parting stage, and discharge and unload the high-pressure fluid in the expansion cavity.

[0011] Optionally, the flow control module includes a flow control valve, which has a main flow channel for connecting the lower chamber of the support cylinder with the damping branch or the power supply branch. The main flow channel has a throttling zone, and the flow control valve also has a logic valve core controlled by the pressure difference across the throttling zone. The logic valve core is configured with a filling position and an oil drain position. When hydraulic fluid flows out of the support cylinder, the back pressure generated in the throttling zone of the main flow channel drives the logic valve core to move to the filling position. At this time, the expansion chamber is connected to the lower chamber of the support cylinder. When hydraulic fluid flows into the support cylinder, the pressure drop generated in the throttling zone of the main flow channel drives the logic valve core to switch to the drain position. At this time, the expansion chamber is disconnected from the lower chamber of the support cylinder and connected to the external oil tank.

[0012] Optionally, a locking claw is hinged to the bottom of the inner wall of the support cylinder, and a locking groove is provided at the bottom of the outer wall of the lifting guide column. When the lifting guide column moves down to the locking position after mold closing, the locking claw engages with the locking groove to restrict the lifting guide column from rebounding upward.

[0013] Optionally, the side wall of the support cylinder is provided with an unlocking component that is sealed to it. One end of the unlocking component is used to connect to the upper mold base, and the other end is connected to the locking claw. The unlocking key is configured to pull the locking claw away from the locking groove when the upper mold base reaches a preset stroke threshold during its upward return stroke.

[0014] Optionally, a floating contact head is hinged to the top of the lifting guide column, and a buffer pad is embedded on the upper surface of the floating contact head.

[0015] In summary, this application includes at least one of the following beneficial effects: 1. An elastic sleeve is sealed on the outer wall of the lifting guide column, forming a closed annular expansion cavity with the inner wall of the elastic sleeve and the outer wall of the lifting guide column. An expansion channel is provided inside the lifting guide column, and the expansion cavity is connected to the lower cavity of the support cylinder through the expansion channel. Simultaneously, a damping branch connects the lower cavity of the support cylinder to the accumulator. A throttling element is installed on the damping branch. During mold closing, the lifting guide column engages with the guide sleeve in the upper mold base, and the lifting guide column is pressed down. During this pressing process, the lifting guide column forces the hydraulic fluid in the lower cavity of the support cylinder into the accumulator through the damping branch. Due to the throttling element on the damping branch, back pressure is generated in the hydraulic fluid in the lower cavity of the support cylinder. At this time, the squeezed hydraulic fluid converts the kinetic energy of the upper mold into heat and pressure energy, providing a buffer for the rapid mold closing action, greatly reducing the impact vibration at the moment of mold closing, and the squeezed hydraulic fluid... The hydraulic fluid in the accumulator transfers the pressure energy generated during the mold closing process to the accumulator. During this process, some of the pressure energy stored in the accumulator can flow back into the lower cavity of the support cylinder from the power supply branch when the mold is separated. This can actively lift the lifting guide column, and then lift the upper mold base through the lifting guide column. This instantly destroys the mold separation resistance such as vacuum suction force and oil film tension generated during mold closing, which can significantly reduce the difficulty of mold separation. At the same time, during the mold closing stage, some of the hydraulic fluid pressurized by the downward pressure enters the annular expansion cavity through the expansion channel. The pressurized hydraulic fluid has enough pressure to drive the elastic sleeve to expand radially. Due to the fast mold closing speed, the expanded elastic sleeve forms an interference fit with the guide sleeve inside the upper mold base at the moment of mold closing, which firmly locks the lifting guide column and the guide sleeve, so that the fit between the lifting guide column and the guide sleeve can withstand the lateral thrust generated at the moment of mold closing. 2. By installing flow control valves at the hydraulic fluid inlet and outlet of the support cylinder, the flow control valves can drive the logic valve core to switch between the filling and draining positions based on the hydraulic fluid flow direction and pressure difference at the position of the internal main flow channel throttling zone. When the logic valve core is in the filling position, the flow control valve connects the damping branch to the lower cavity of the support cylinder and connects the lower cavity of the support cylinder to the expansion channel, so that the pressurized hydraulic fluid can flow to both the damping branch and the expansion channel simultaneously. When the logic valve core is in the draining position, the flow control valve connects the power supply branch to the lower cavity of the support cylinder and cuts off the passage between the lower cavity of the support cylinder and the expansion channel. At the same time, the expansion channel is connected to the external unloading channel, so that the pressurized oil in the expansion chamber is discharged before the hydraulic fluid drives the lifting guide column to rise, so that the expanded elastic sleeve contracts to its initial state. At this time, the elastic sleeve and the guide sleeve in the upper mold base are in clearance fit, which facilitates the separation of the lifting guide column and the guide sleeve. Attached Figure Description

[0016] Figure 1 This is a schematic diagram illustrating the overall structure of the stamping die according to an embodiment of this application; Figure 2This is a structural schematic diagram illustrating the positions of the supporting cylinder and the lifting guide column in an embodiment of this application; Figure 3 This is an exploded view of the mounting structure of the support cylinder and the lifting guide column shown in the embodiment of this application; Figure 4 This is a cross-sectional schematic diagram illustrating the internal structure of the support cylinder and the lifting guide column in an embodiment of this application; Figure 5 yes Figure 4 An enlarged view at point A; Figure 6 This is a schematic diagram illustrating the control logic of the flow direction control valve in an embodiment of this application; Figure 7 yes Figure 4 Enlarged diagram at point B.

[0017] Explanation of reference numerals in the attached drawings: 1. Upper mold base; 11. Upper mold; 12. Hydraulic guide rod; 13. Guide sleeve; 2. Lower mold base; 21. Lower mold; 3. Support cylinder; 31. Distribution pipe; 32. Locking claw; 33. Unlocking component; 4. Lifting guide post; 41. Floating contact head; 42. Elastic sleeve; 421. Expansion groove; 43. Mounting groove; 44. Sealing ring; 45. Expansion channel; 46. Locking groove; 5. Actuation unit; 51. Accumulator; 52. Damping branch; 53. Power supply branch; 54. Overflow branch; 55. Flow direction control valve. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0019] This application discloses an auxiliary parting device for automotive body panels, see embodiments thereof. Figure 1 The auxiliary mold-separating equipment for automotive body panels includes an upper mold base 1, a lower mold base 2, and upper molds 11 and 21 fixed within the upper and lower mold bases 2 respectively and corresponding to each other. During mold closing, the upper mold base 1 moves downward until the upper mold 11 and lower mold 21 are fitted together to form a complete cold stamping mold, which can cold stamp and form metal sheets placed between the upper and lower molds 21. A hydraulic guide rod 12 is also vertically penetrating and slidably connected inside the upper mold base 1, which can provide stable guidance for the vertical sliding of the upper mold base 1.

[0020] For example, refer to Figures 2 to 6A guide unit is provided between the upper mold base 1 and the lower mold base 2 to provide more precise guidance for mold closing. The guide unit includes a support cylinder 3, a lifting guide post 4 vertically slidably connected within the support cylinder 3, and a guide sleeve 13. The support cylinder 3 is fixedly installed on the top surface of the lower mold base 2 by fastening bolts and fixing claws. The support cylinders 3 are distributed at the four corner positions of the lower mold base 2, while the guide sleeves 13 are embedded and fixed inside the bottom surface of the upper mold base 1, with each guide sleeve 13 corresponding to one of the support cylinders 3. The support cylinder 3 is preferably forged from high-strength alloy steel, and its inner wall is plated with a hard chrome layer to improve wear resistance.

[0021] The lifting guide post 4, acting as a piston rod, is inserted into and sealed within the support cylinder 3. The lower cavity of the support cylinder 3, corresponding to the lifting guide post 4, is filled with hydraulic oil. The lower mold base 2 also houses an execution unit 5 connected to the internal hydraulic circuit of the support cylinder 3, used to regulate the flow of hydraulic oil according to working conditions. The lifting guide post 4 and guide sleeve 13 also correspond one-to-one. During mold closing, the lifting guide post 4 is inserted into the guide sleeve 13, providing more precise guidance for mold closing. In this embodiment, the lifting guide post 4 and guide sleeve 13 are preferably clearance-fitted. This allows for slight deformation during the rise of the upper mold base 1 without interference between the lifting guide post 4 and guide sleeve 13, effectively preventing seizing or tearing between them and reducing the impact on mold parting.

[0022] In some embodiments, a floating contact head 41 is hinged to the top of the lifting guide post 4 via a universal ball joint. The floating contact head 41 has a plate-like structure, and a buffer pad is embedded on its upper surface. The floating contact head 41 contacts the inner wall of the guide sleeve 13 through the buffer pad, and the shape of the inner top wall of the guide sleeve 13 matches the shape of the floating contact head 41. The presence of the universal ball joint allows the floating contact head 41 to swing freely within a certain angle. Even if the inner top wall of the guide sleeve 13 is not machined evenly, or if the upper mold base 1 tilts at the moment of mold parting, the floating contact head 41 can automatically fit against the inner top wall surface of the guide sleeve 13 by swinging, ensuring vertical force transmission and preventing the lifting guide post 4 from bearing lateral bending moment.

[0023] In some embodiments, the lifting guide post 4 is sealed on its outer periphery and coaxially fitted with an elastic sleeve 42 capable of radial contraction or expansion. When the elastic sleeve 42 expands radially, it can form an interference fit with the guide sleeve 13. When the elastic sleeve 42 contracts radially, it can restore the clearance fit between the lifting guide post 4 and the guide sleeve 13. Specifically, the elastic sleeve 42 is fitted on the part of the lifting guide post 4 located outside the support cylinder 3. To fix the relative position of the elastic sleeve 42, an annular mounting groove 43 is opened on the outer wall of the lifting guide post 4. The elastic sleeve 42 is correspondingly embedded in the mounting groove 43. Along the radial direction of the lifting guide post 4, there is a gap between the inner wall of the elastic sleeve 42 and the outer wall of the lifting guide post 4 at the corresponding mounting groove 43, so that the elastic sleeve 42 can radially contract back into the mounting groove 43. To achieve a sealed connection between the elastic sleeve 42 and the lifting guide post 4, sealing rings 44 are fixed on both the upper and lower sides of the elastic sleeve 42. The outer diameter of the sealing ring 44 is the same as the outer diameter of the lifting guide post 4. The inner wall of the sealing ring 44 abuts against the outer wall of the corresponding mounting groove 43 of the lifting guide post 4, so that a relatively sealed expansion cavity is formed between the lifting guide post 4 and the elastic sleeve 42.

[0024] Correspondingly, an expansion channel 45 is coaxially and vertically penetrated within the lifting guide column 4. The lower opening of the expansion channel 45 is located on the bottom surface of the lifting guide column 4, and the upper opening of the expansion channel 45 is located at the mounting groove 43 of the lifting guide column 4. This allows the expansion channel 45 to connect the lower cavity space of the supporting cylinder 3 with the expansion cavity formed by the lifting guide column 4 and the elastic sleeve 42. Furthermore, to ensure that the elastic sleeve 42 has good radial deformation capability, the elastic sleeve 42 is preferably made of spring steel with a high elastic limit and undergoes quenching and medium-temperature tempering treatment to ensure that the elastic sleeve 42 has excellent elastic recovery capability and wear resistance. In addition, the elastic sleeve 42 itself has a relatively thin wall thickness, ranging from 1.5 to 2 mm. Furthermore, the elastic sleeve 42 has a double-layer structure with an outer wall and an inner wall, and the thickness of the inner wall of the elastic sleeve 42 is less than that of the outer wall. The inner wall of the elastic sleeve 42 remains intact, while the outer wall of the elastic sleeve 42 has multiple non-through expansion grooves 421 spaced along its own axial direction. The expansion grooves 421 are processed by wire cutting, and the solid rings at both ends of the elastic sleeve 42 are left uncut to ensure the overall structural strength of the elastic sleeve 42 and the sealing of the upper and lower ends. The opening of the expansion grooves 421 significantly reduces the circumferential stiffness of the elastic sleeve 42, so that when the inner cavity is filled with high-pressure hydraulic oil, the elastic sleeve 42 can achieve the predetermined radial expansion deformation with lower pressure.

[0025] Understandably, when the mold is not closed, there is no high-pressure hydraulic oil in the sealed expansion area formed between the elastic sleeve 42 and the lifting guide post 4. All the hydraulic oil is located in the lower cavity of the support cylinder 3. At this time, the elastic sleeve 42 is in a contracted state, and the guide sleeve 13 and the lifting guide post 4 are in a clearance fit. When the mold is closed, the upper mold base 1 descends, causing the guide sleeve 13 to engage with the lifting guide post 4. Subsequently, the lifting guide post 4 is pressed down. During the pressing process, the lifting guide post 4 pressurizes the hydraulic oil in the lower cavity of the support cylinder 3. Most of the pressurized hydraulic oil is squeezed out of the support cylinder 3 and is distributed by the execution unit 5. During this process, the squeezed hydraulic oil can convert the kinetic energy of the upper mold base 1 when it descends into heat energy and pressure energy, thereby facilitating the rapid mold closing action. The system provides a buffer, greatly reducing the impact and vibration at the moment of mold closing. Some of the pressurized hydraulic oil enters the expansion channel 45 and flows along the expansion channel 45 into the sealed expansion space formed between the elastic sleeve 42 and the lifting guide post 4, transmitting the pressure there as well. Subsequently, the elastic sleeve 42 expands radially under the pressure of the hydraulic oil. Due to the fast mold closing speed, the expanded elastic sleeve 42 forms an interference fit with the guide sleeve 13 at the moment of mold closing. At the moment when the upper mold 11 contacts the metal sheet for drawing, i.e., at the moment of maximum lateral force, the lifting guide post 4 and the guide sleeve 13 are radially locked, so that the fit between the lifting guide post 4 and the guide sleeve 13 can withstand the large lateral thrust generated at the moment of mold closing, greatly improving the quality of stamping.

[0026] For example, the execution unit 5 includes an accumulator 51 and a damping branch 52 and a power supply branch 53 connecting the accumulator 51 and the lower cavity of the support cylinder 3. The accumulator 51 can be a conventional bladder-type accumulator. The accumulator 51 can be pre-filled with pressurized nitrogen and also has an independent cavity for containing hydraulic oil. The accumulator 51 can contain pressurized hydraulic oil and store the pressure, and then discharge the pressurized hydraulic oil to the outside. The damping branch 52 is used to guide the hydraulic oil squeezed out of the lower cavity of the support cylinder 3 into the accumulator 51, while the power supply branch 53 is used to guide the hydraulic oil in the accumulator 51 back into the lower cavity of the support cylinder 3. A high-pressure check valve and an adjustable precision throttle valve are connected in series on the pipe of the damping branch 52. The high-pressure check valve directs the flow from the support cylinder 3 to the accumulator 51, while the precision throttle valve has a smaller flow area to generate greater fluid resistance during mold closing. A large-diameter hydraulic control check valve is connected in series on the power supply branch 53. The hydraulic control check valve directs the flow from the accumulator 51 to the support cylinder 3. The flow capacity of the power supply branch 53 is stronger than that of the damping branch 52. The hydraulic control check valve is normally in the closed state and only opens instantaneously when the mold parting signal is triggered, allowing the high-pressure oil in the accumulator 51 to burst into the support cylinder 3 with extremely low flow resistance.

[0027] In some embodiments, the execution unit 5 further includes an overflow branch 54. One end of the overflow branch 54 is connected to the damping branch 52 and / or the power supply branch 53, and the other end extends outward and is connected to an empty oil tank. In this embodiment, the bottom end of the support cylinder 3 is connected to a distribution pipe 31. The support cylinder 3 is simultaneously connected to the damping branch 52, the power supply branch 53, and the overflow branch 54 through the distribution pipe 31. A direct-acting overflow valve is also connected in series on the overflow branch 54. The opening pressure of the overflow valve is greater than the pressure of the hydraulic oil inside the support cylinder 3 under normal conditions. When the mold is closed, if the internal pressure of the damping branch 52 or the power supply branch 53 exceeds a preset safety threshold, the overflow branch 54 opens to quickly unload, protecting the elastic sleeve 42 from bursting and also protecting the press connecting rod from overload.

[0028] In some embodiments, the execution unit 5 further includes a flow control valve 55, which is located at the junction of the distribution pipe 31 and each branch. In this embodiment, the body of the flow control valve 55 is installed inside the support cylinder 3 near the bottom. The flow control valve includes a valve body, a logic valve core, and a return spring. The valve body is coaxially arranged with the support cylinder 3, and the top end of the valve body is inserted upward into the expansion channel 45 of the lifting guide post 4 and is vertically slidably connected to the lifting guide post 4. The bottom end of the valve body is inserted downward into the distribution pipe 31. The logic valve core is preferably a spool valve core, which can adjust its position according to the different pressures in the pipeline, so that the flow control valve 55 can control the communication state between the distribution pipe 31 and the lower cavity of the support cylinder 3. The return spring is responsible for resetting the logic valve core.

[0029] Furthermore, the valve body is provided with four functional interfaces, namely ports A, B, C, and D. Port A is located on the side wall of the valve body inside the distribution pipe 31, and is used to communicate with the inner cavity of the distribution pipe 31, so that port A can be connected to each branch. Port B is located on the side wall of the valve body near the bottom of the lower cavity of the supporting cylinder 3, allowing it to communicate with the lower cavity of the supporting cylinder 3. Port A is connected to Port B, and the channel between Port A and Port B serves as the main flow channel, connecting the lower cavity of the supporting cylinder 3 with various functional branches. The valve body has a throttling zone within the main flow channel, with a throttling orifice of fixed flow resistance. The diameter of the throttling orifice is smaller than the diameter of the main flow channel, which can generate a significant pressure difference at both ends of the throttling orifice when hydraulic oil flows. The logic valve core spans both ends of the throttling orifice, and its two ends sense the pressure at the front and rear ends of the throttling orifice, thereby automatically adjusting the valve core displacement according to the pressure difference. The logic valve core is configured with a filling position and an oil drain position, and can automatically switch to the corresponding position according to the pressure difference, thereby achieving precise control of oil discharge and injection in the supporting cylinder 3. Port C is located on the side wall of the valve body inserted into the expansion channel 45 of the lifting guide column 4. It can guide the hydraulic oil in the lower cavity of the support cylinder 3 into the expansion channel 45 of the lifting guide column 4. Port C can be connected to Port B under pressure, while Port D is directly connected to the oil tank through a pipeline. Under normal circumstances, Port C and Port D are disconnected. When Port C and Port D are connected, the high-pressure hydraulic oil squeezed into the expansion channel 45 can be discharged, thereby realizing the controllable contraction of the elastic sleeve 42.

[0030] Specifically, during the mold closing stage, the upper mold base 1 descends, causing the guide sleeve 13 to press down on the lifting guide post 4. The lifting guide post 4 descends under pressure and sends the hydraulic oil in the lower cavity of the support cylinder 3 into the distribution pipe 31 through port B, the throttle hole, and port A. Since the damping branch 52 is open and connected in series with a high-pressure check valve, while the power supply branch 53 and the overflow branch 54 are both closed, the hydraulic oil can only flow unidirectionally through the damping branch 52 and generate high flow resistance, thereby effectively buffering the downward speed of the upper mold base 1 and ensuring that the hydraulic oil inside the support cylinder 3 maintains a stable back pressure. During this process, the accumulator 51 only allows hydraulic oil to flow in and store energy. When the hydraulic oil flows through the throttle orifice, it generates back pressure, which makes the pressure at the end near port B in the main channel higher than that at the end near port A. Under the action of pressure difference, the logic valve core is pushed to the filling position. At this time, port C is connected to port B, while port C and port D remain disconnected. Part of the pressurized hydraulic oil is injected into the expansion channel 45 of the lifting guide post 4 through port C, and then pushes the elastic sleeve 42 to expand radially along the expansion channel 45, thereby achieving radial locking between the lifting guide post 4 and the guide sleeve 13.

[0031] During the mold separation stage, the accumulator 51 releases the stored hydraulic energy and injects high-pressure hydraulic oil into the distribution pipe 31 in reverse through the power supply branch 53. Then, it enters the lower cavity of the support cylinder 3 through port A, throttle hole and port B. The hydraulic energy stored during mold closing actively pushes the lifting guide post 4 to move upward to counteract the vacuum suction force generated after mold closing, thereby quickly separating the upper mold base 1 and the lower mold base 2, which can significantly reduce the difficulty of mold separation. Before the hydraulic oil pushes the lifting guide post 4 to lift, the pressure difference at both ends of the throttle hole reverses when the hydraulic oil flows through the main channel. The logic valve core is pushed to the oil discharge position. At this time, the logic valve core physically cuts off the connection between port B and port C, and connects port C and port D. At this time, the high pressure oil in the expansion channel 45 is quickly discharged through port C and port D. The elastic sleeve 42 then contracts radially, releasing the locking state between the lifting guide post 4 and the guide sleeve 13. This allows the lifting guide post 4 and the guide sleeve 13 to return to a clearance fit, providing unobstructed guiding space for the mold parting action. This ensures that the upper mold base 1 retracts smoothly and quickly. Even if the upper mold base 1 has a slight sway or tilt due to the rise, the guide sleeve 13 can slide smoothly along the outer wall of the lifting guide post 4, greatly reducing the friction loss and jamming risk between the guide sleeve 13 and the lifting guide post 4.

[0032] In some embodiments, a locking claw 32 is hinged to the inner wall of the support cylinder 3 near the bottom. A clearance groove is provided on the inner wall of the support cylinder 3 corresponding to the locking claw 32, allowing the locking claw 32 to extend without interfering with the lifting guide post 4. A locking groove 46 is provided on the outer wall of the lifting guide post 4. When the lifting guide post 4 descends to the locking position after mold closing, the locking claw 32 engages with the locking groove 46 to restrict the upward rebound of the lifting guide post 4. To maintain the extension tendency of the locking claw 32, a retaining spring is also provided on the inner wall of the support cylinder 3. One end of the retaining spring is connected to the inner wall of the support cylinder 3, and the other end is connected to the extended end of the locking claw 32. The retaining spring can push the locking claw 32 to maintain its extension tendency, so that when the locking claw 32 corresponds to the locking groove 46, the locking claw 32 can instantly engage with the locking groove 46.

[0033] Furthermore, an unlocking component 33 is provided and sealed to the side wall of the support cylinder 3. The unlocking component 33 is preferably a steel cable. One end of the unlocking component 33 extends out of the support cylinder 3 and is fixedly connected to the upper mold base 1, while the other end extends into the support cylinder 3 and is connected to the protruding end of the locking claw 32. When the upper mold base 1 moves upwards for its return stroke, the steel cable is pulled upwards and drives the locking claw 32 to overcome the spring force and disengage from the locking groove 46. At this time, the lifting guide column 4 loses its mechanical restraint and is ready to pop out under the action of hydraulic energy.

[0034] The implementation principle of an auxiliary mold-separating device for automotive body panels according to an embodiment of this application is as follows: During mold closing, the lifting guide post 4 is pressed down, which pressurizes and squeezes out the hydraulic oil in the lower cavity of the support cylinder 3. The squeezed-out hydraulic oil enters the accumulator 51 for storage along the damping branch 52. Part of the pressurized hydraulic oil enters the annular cavity of the elastic sleeve 42 along the expansion channel 45, causing the elastic sleeve 42 to expand radially, thereby achieving radial locking between the lifting guide post 4 and the guide sleeve 13 during mold closing and offsetting the lateral force generated during mold closing. During mold separation, the high-pressure oil in the expansion channel 45 is discharged first, causing the elastic sleeve 42 to contract radially. At this time, the clearance fit between the lifting guide post 4 and the guide sleeve 13 is restored. Subsequently, the accumulator 51 releases the stored hydraulic energy, pushing the lifting guide post 4 to pop up and lift the upper mold base 1 back to its original position.

[0035] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0036] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0037] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. An auxiliary parting device for automotive body panels, characterized in that: It includes a support cylinder (3) installed on the lower mold base (2), a lifting guide column (4) that is slidably and sealedly connected in the support cylinder (3), and an execution unit (5) that is connected to the hydraulic circuit of the support cylinder (3). The lifting guide post (4) is used to cooperate with the guide sleeve (13) of the upper mold base (1) for guidance; The lifting guide column (4) is sealed on the outer periphery and coaxially fitted with an elastic sleeve (42) that can radially contract or expand, so as to form an expansion cavity between the lifting guide column (4) and the elastic sleeve (42). An expansion flow channel (45) is opened through the lifting guide column (4) to connect the lower cavity space of the support cylinder (3) and the expansion cavity. The execution unit (5) is configured to: receive the fluid discharged from the support cylinder (3) and establish back pressure during the mold closing stage to generate damping force for buffering the mold closing impact, while driving the elastic sleeve (42) to expand radially through the expansion channel (45) to lock the guide; during the mold parting stage, release the stored pressure fluid to the lower cavity of the support cylinder (3), and drive the lifting guide post (4) to lift the upper mold base (1) after discharging the pressure fluid in the expansion cavity.

2. The auxiliary parting device for automotive body panels according to claim 1, characterized in that: The elastic sleeve (42) is made of elastic metal and is an annular thin-walled component. Multiple non-through expansion grooves (421) are opened axially on the outer wall surface of the elastic sleeve (42). The depth of the expansion grooves (421) is less than the wall thickness of the elastic sleeve (42) so that the inner wall of the elastic sleeve (42) remains completely sealed. The outer wall surface of the lifting guide post (4) is provided with an annular mounting groove (43). The elastic sleeve (42) is correspondingly sealed and covered on the outer periphery of the mounting groove (43) of the lifting guide post (4) so ​​that the expansion cavity is closed.

3. The auxiliary parting device for automotive body panels according to claim 1, characterized in that: The execution unit (5) includes an accumulator (51) and a hydraulic control module that connects the support cylinder (3) and the accumulator (51) via a hydraulic circuit; The hydraulic control module includes a damping branch (52) and a power supply branch (53) connected in parallel. The damping branch (52) is configured to allow only the pressure fluid to flow from the support cylinder (3) to the accumulator (51) and is equipped with a throttling element to generate back pressure. The power supply branch (53) is configured to allow only the pressure fluid to flow from the accumulator (51) to the main cylinder and has a flow capacity greater than that of the damping branch (52).

4. The auxiliary parting device for automotive body panels according to claim 3, characterized in that: The hydraulic control module also includes an overflow branch (54), one end of which is connected to the damping branch (52) and / or the power supply branch (53), and the other end is used to connect to an external oil tank. When the internal pressure of the damping branch (52) or the power supply branch (53) exceeds the preset safety threshold, the overflow branch (54) opens to unload.

5. The auxiliary parting device for automotive body panels according to claim 3, characterized in that: The execution unit (5) further includes a flow direction control module. The flow direction control module is located at the opening position at the bottom of the support cylinder (3) for hydraulic fluid to enter and exit. The flow direction control module is configured to: when hydraulic fluid flows out of the support cylinder (3) during the mold closing stage, use the pressure difference to connect the lower cavity of the support cylinder (3) with the expansion cavity for filling and expansion; when hydraulic fluid flows into the support cylinder (3) during the mold parting stage, use the pressure difference to cut off the passage between the lower cavity of the support cylinder (3) and the expansion cavity, and discharge and unload the high pressure fluid in the expansion cavity.

6. The auxiliary parting device for automotive body panels according to claim 5, characterized in that: The flow control module includes a flow control valve (55), which has a main flow channel for connecting the lower chamber of the support cylinder (3) with the damping branch (52) or the power supply branch (53). The main flow channel has a throttling zone. The flow control valve (55) also has a logic valve core controlled by the pressure difference at both ends of the throttling zone. The logic valve core is configured with a filling position and an oil drain position. When the hydraulic fluid flows out of the support cylinder (3), the back pressure generated in the throttling zone of the main flow channel drives the logic valve core to move to the filling position. At this time, the expansion chamber is connected to the lower chamber of the support cylinder (3). When the hydraulic fluid flows into the support cylinder (3), the pressure drop generated in the throttling zone of the main flow channel drives the logic valve core to switch to the drain position. At this time, the expansion chamber is disconnected from the lower chamber of the support cylinder (3) and connected to the external oil tank.

7. The auxiliary parting device for automotive body panels according to claim 1, characterized in that: The bottom of the inner wall of the support cylinder (3) is hinged with a locking claw (32), and the bottom of the outer wall of the lifting guide column (4) is provided with a locking groove (46). When the lifting guide column (4) closes and moves down to the locking position, the locking claw (32) engages with the locking groove (46) to limit the upward rebound of the lifting guide column (4).

8. The auxiliary parting device for automotive body panels according to claim 7, characterized in that: The side wall of the support cylinder (3) is provided with an unlocking component (33) which is sealed and connected. One end of the unlocking component (33) is used to connect to the upper mold base (1), and the other end is connected to the locking claw (32). The unlocking key is configured to pull the locking claw (32) away from the locking groove (46) when the upper mold base (1) reaches a preset stroke threshold during the upward return stroke.

9. The auxiliary parting device for automotive body panels according to claim 1, characterized in that: The top of the lifting guide column (4) is hinged with a floating contact head (41), and a buffer pad is embedded on the upper surface of the floating contact head (41).

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