Valve body punch forming device

Abstract

The invention discloses a valve body punch forming device which comprises a rack, a multi-station turret mold frame, a plurality of lower mold bases, an upper mold base, a fixed-point lubricating mechanism and a locking piece, each lower mold base comprises a lower mold plate, a male mold, a first supporting table and a second supporting table, and each upper mold base comprises an upper mold plate, a first forming plate, a second forming plate and a pressing plate. When the first boss of the workpiece is punched and formed, the locking piece is in a locking state, so that the first supporting table and the second supporting table are relatively fixed, and the first forming plate and the second forming plate are relatively fixed; and when the second boss of the workpiece is punched and formed, the locking piece is in a release state, so that relative movement between the first supporting table and the second supporting table and relative movement between the first forming plate and the second forming plate are allowed. According to the valve body punch forming device, the lower die base and the upper die base are combined with the locking piece with the switchable state, a double-boss structure is formed at a time, and accumulative errors caused by repeated positioning in multi-process production are fundamentally eliminated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valve body stamping, and more particularly to a valve body stamping forming device. BACKGROUND

[0002] The valve body is a key executive component in a fluid control system, and its main components include a valve cover, a valve core, a valve seat, a valve rod, etc. The valve cover, as an important component of the valve body, usually needs to have a complex geometric shape to meet the sealing, connection and strength requirements. A common valve cover structure is a structure with double bosses, i.e., two concentric boss parts with different heights or diameters on the valve cover body. These bosses are used for mounting a sealing element, connecting with the valve body, or providing guiding support for the valve rod.

[0003] Currently, for such valve cover parts with multiple levels of bosses, the mainstream manufacturing method is to use cold stamping forming of a metal sheet. For a double boss structure, two or more sets of molds are usually designed, and the stamping forming is performed in multiple steps and multiple times on different presses or different stations of the same press, which leads to scattered production processes, multiple positioning and clamping of the workpiece, low production efficiency, increased equipment investment and floor space, and in addition, since the workpiece needs to be transferred between multiple processes or stations, there are small errors in each positioning, and the cumulative error of multiple positioning can seriously affect the shape and position tolerances of the final product, especially the concentricity, parallelism and relative height difference between the two bosses, which can cause the valve cover to be not tightly sealed or difficult to assemble. In addition, when stamping the second boss in multiple steps, the formed first boss area may be slightly deformed or displaced due to stress, affecting the dimensional stability of the final product. Therefore, improvements are needed. SUMMARY The present application aims to provide a valve body stamping forming device to solve the problems raised in the background.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions: A valve body stamping forming device, comprising: a frame; a multi-station turret mold frame, comprising a precision indexing turntable rotatably connected to the surface of the frame, the precision indexing turntable being driven by a servo motor to realize intermittent precision positioning through a cam indexer; a plurality of lower mold seats, which are fixed uniformly in a circumferential direction on the surface of the precision indexing turntable, and each lower mold seat comprises a lower mold plate having a forming cavity in the middle, a male die fixed in the middle of the forming cavity, a first support table sleeved on the outer wall of the male die, and a second support table sleeved on the outer wall of the first support table, the first support table and the second support table being fixedly connected with the lower mold plate through first elastic members; The upper die base is driven by the press to move away from or close to the lower die base to realize press forming, and comprises an upper die plate fixedly connected to the output end of the press, a first forming plate connected to the bottom of the upper die plate through a guide assembly, a second forming plate sleeved on the outer wall of the first forming plate, and a pressing plate fixed in the inner cavity of the first forming plate through a second elastic element; the bottom of the first forming plate is provided with a groove, and the pressing plate is located in the groove; and the second forming plate is fixed to the bottom of the upper die plate. A point lubrication mechanism is integrated in the first forming plate and the second forming plate. A locking member is arranged between the first support table and the second support table, and between the first forming plate and the second forming plate. When a first boss of the workpiece is formed by stamping, the locking member is in a locking state to keep the first support table and the second support table, and the first forming plate and the second forming plate relatively fixed; and when a second boss of the workpiece is formed by stamping, the locking member is in a releasing state to allow the first support table and the second support table, and the first forming plate and the second forming plate to relatively move.

[0006] Preferably, the locking member comprises driving cylinders fixed on the second support table and the second forming plate respectively, the output end of each driving cylinder is fixedly connected with a locking pin, and the outer wall of the first support table and the first forming plate is respectively provided with a pin hole.

[0007] Preferably, the guide assembly comprises a guide sleeve fixed to the upper die plate and a guide column fixed to the first forming plate, the guide column and the guide sleeve are in sliding fit, a third elastic element is sleeved on the outer part of the guide column, and the two ends of the third elastic element are respectively abutted against the upper die plate and the first forming plate.

[0008] Preferably, the point lubrication mechanism comprises an oil channel formed in the first forming plate and the second forming plate, and an oil groove arranged on the sliding fit surface of the first forming plate and the second forming plate, and the inlet of the oil channel is connected with a concentrated oil supply connector. Preferably, a lubricating block made of wear-resistant material is detachably connected at the outlet of the oil groove, and the lubricating block is respectively located at the bottom corner of the first forming plate and the second forming plate.

[0009] Preferably, the lubricating block comprises a forming part, a lubricating part, a cooling part and a clamping part, the forming part is located between the lubricating part and the cooling part, the clamping part is fixed in the oil groove through a fastening screw, the inner part of the lubricating part, the cooling part and the clamping part is respectively provided with a network of interconnected micropores, the network of micropores is communicated with the oil channel, and the working surface of the lubricating part and the cooling part is respectively provided with a network or spiral oil guide pattern.

[0010] Preferably, the working surface of the forming part is an arc surface.

[0011] Preferably, the bottom of the upper die plate is fixedly connected with a hydraulic oil cylinder, the output end of the hydraulic oil cylinder is fixedly connected with a punch, the center holes are arranged in the middle of the pressing plate and the male die, a plurality of waste channels are arranged on the precision indexing turntable, and the waste channels are coaxial with the corresponding center holes.

[0012] Preferably, a waste collecting box is arranged on the rack and located directly below the upper die seat.

[0013] Preferably, a feeding mechanism and a discharging mechanism are arranged on the rack, and the feeding mechanism and the discharging mechanism each comprise a mounting base fixed on the rack, a linear drive module fixedly installed on the mounting base, a one-way pneumatic cylinder connected to the output end of the linear drive module, a two-way pneumatic cylinder fixed to the output end of the one-way pneumatic cylinder, and a mechanical gripper fixed to the output end of the two-way pneumatic cylinder.

[0014] By adopting the foregoing technical scheme, the present application has the following beneficial effects: 1. By arranging the relatively movable first support table and the second support table, the first forming plate and the second forming plate, and combining the switchable locking piece, the precise control of material flow is realized, when the first boss is punched, the locking piece is locked, the die seat is deep-drawn as a whole, and the shape of the first boss is ensured; when the second boss is punched, the locking piece is released, the first support table and the first forming plate can move relatively under the action of the first elastic member and the second elastic member, flexible forming is formed, workpiece breakage or wrinkling is effectively prevented, and the present application is particularly suitable for complex workpieces such as valve covers with multiple bosses, the double-boss structure is formed at one time, and the cumulative error caused by repeated positioning in multi-process production is fundamentally eliminated.

[0015] 2. By arranging the multi-station turret die frame driven by the cam indexer of the servo motor and the plurality of lower die seats uniformly distributed in the circumferential direction, the multi-station continuous production of the workpiece under a single press is realized, when one station is punched, other stations can simultaneously be fed or discharged, the production process is continuous, the production rhythm is greatly reduced, the efficiency is improved, the automatic grabbing, moving and placing of the workpiece are realized through the cooperation of the linear drive module, the one-way pneumatic cylinder, the two-way pneumatic cylinder and the mechanical gripper, the structure can realize multi-degree-of-freedom action, accurately feed the blank into the die or take out the finished product, thereby cooperating with the multi-station turret die frame to form a complete automatic production unit, significantly reducing labor costs and ensuring operation safety.

[0016] 3、The lubricating block is divided into a forming part, a lubricating part, a cooling part and a clamping part, realizing multi-functional integration, the internal micro-pore network ensures that the lubricating oil can uniformly penetrate the entire working surface, the oil guide lines on the working surface help the lubricating oil to diffuse on the contact surface to form a uniform oil film, this structure not only reduces friction, and in the process of stamping and forming the workpiece, the lubricating part is located at the front end of the stamping stroke, first outputs lubricating oil to the surface of the workpiece to be processed, then the forming part extrudes the workpiece to form it, finally, the cooling part is located at the rear end of the stamping stroke, outputs lubricating oil to the surface of the just-formed workpiece, can take away part of the friction heat and workpiece heat, plays a certain cooling effect, further improves the forming conditions. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings incorporated in and forming a part of the specification illustrate embodiments of the present application and, together with the description, serve to explain the principles of the application.

[0018] Figure 1 It is a whole structure schematic diagram of the valve body stamping and forming device in an embodiment; Figure 2 It is a multi-station turret die frame structure schematic diagram in an embodiment; Figure 3 It is a lower die seat structure schematic diagram in an embodiment; Figure 4 It is Figure 3 the enlarged schematic diagram of the structure at A in Figure 5 It is an upper die seat structure schematic diagram in an embodiment; Figure 6 It is an upper die seat partial structure schematic diagram in an embodiment; Figure 7 It is a first forming plate structure schematic diagram in an embodiment; Figure 8 It is a pressing plate structure schematic diagram in an embodiment; Figure 9 It is a second forming plate internal structure schematic diagram in an embodiment; Figure 10 It is Figure 9 the enlarged schematic diagram of the structure at B in Figure 11 It is a lubricating block structure schematic diagram in an embodiment; Figure 12 It is a feeding mechanism or unloading mechanism structure schematic diagram in an embodiment; Figure 13 It is a valve cover structure schematic diagram after stamping and forming in an embodiment.

[0019] Reference signs: 100, frame; 101, mounting base; 102, linear drive module; 103, single-acting cylinder; 104, double-acting cylinder; 105, mechanical gripper; 110, waste collection box; 120, feeding mechanism; 130, discharging mechanism; 200, multi-station turret mold frame; 210, precision indexing turntable; 220, servo motor; 230, cam indexer; 240, waste passage; 300, lower mold base; 310, lower mold plate; 320, male mold; 330, first support table; 340, second support table; 350, first elastic member; 360, forming cavity; 370, positioning column; 400, upper mold base; 401, hydraulic cylinder; 402, punch; 403, center hole; 410, press; 420, upper mold plate; 430, guide assembly; 431, guide sleeve; 432, guide column; 433, third elastic member; 440, first forming plate; 450, second forming plate; 460, second elastic member; 470, pressing plate; 480, groove; 500, fixed-point lubrication mechanism; 510, oil channel; 520, oil groove; 530, centralized oil supply connector; 540, lubricating block; 541, forming part; 542, lubricating part; 543, cooling part; 544, clamping part; 545, fastening screw; 546, micro-hole network; 547, oil guide pattern; 600, locking member; 610, drive cylinder; 620, locking pin; 630, pin hole. DETAILED DESCRIPTION

[0020] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangements, numerical expressions, and numerical values of components and steps set forth in these embodiments are not limiting to the scope of the present application unless otherwise specifically stated.

[0021] The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the scope of the application, its application, or uses.

[0022] Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail herein, but should be considered as part of the specification, where appropriate.

[0023] In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary, and not as a limitation. Thus, other examples of the exemplary embodiments can have different values.

[0024] As Figures 1-13 shown, a valve body stamping forming device includes a frame 100, a multi-station turret mold frame 200, a plurality of lower mold bases 300, an upper mold base 400, a fixed-point lubrication mechanism 500, and a locking member 600.

[0025] Please refer to Figure 2The multi-station turret die frame 200 comprises a precision indexing turntable 210 rotatably connected to the surface of the frame 100, and the precision indexing turntable 210 is driven by a servo motor 220 to realize intermittent precise positioning through a cam indexer 230.

[0026] Please refer to Figure 1 and Figure 3 A plurality of lower die seats 300 are fixed circumferentially and uniformly on the surface of the precision indexing turntable 210, and each lower die seat 300 comprises a lower die plate 310 with a forming cavity 360 in the middle, a male die 320 fixed in the middle of the forming cavity 360, a first support table 330 sleeved on the outer wall of the male die 320, and a second support table 340 sleeved on the outer wall of the first support table 330. The first support table 330 and the second support table 340 are fixedly connected with the lower die plate 310 through a first elastic member 350.

[0027] It should be noted that the first elastic member 350 is a nitrogen spring. Please refer to Figure 3 The surface of the lower die plate 310 is fixedly connected with a plurality of positioning columns 370. The workpiece is placed in the area surrounded by the plurality of positioning columns 370, which facilitates positioning the workpiece during feeding.

[0028] By setting the multi-station turret die frame 200 driven by the servo motor 220 and the cam indexer 230 and the plurality of lower die seats 300 circumferentially and uniformly distributed, the multi-station continuous production of the workpiece under a single press 410 is realized. When one station is stamping, the other stations can simultaneously feed or unload, making the production process continuous, greatly reducing the production rhythm and improving the efficiency. At the same time, the precision indexing turntable 210 provides intermittent precise positioning, ensuring the height consistency of each lower die seat 300 when moving under the upper die seat 400, and ensuring the quality of each formed workpiece.

[0029] Please refer to Figures 5-9 The upper die seat 400 is driven by the press 410 to move away from or close to the lower die seat 300 to realize compression molding. The upper die seat 400 comprises an upper die plate 420 fixedly connected to the output end of the press 410, a first forming plate 440 connected to the bottom of the upper die plate 420 through a guide assembly 430, a second forming plate 450 sleeved on the outer wall of the first forming plate 440, a pressing plate 470 fixed in the inner cavity of the first forming plate 440 through a second elastic member 460, the bottom of the first forming plate 440 has a groove 480, and the pressing plate 470 is located in the groove 480. The second forming plate 450 is fixed to the bottom of the upper die plate 420.

[0030] It should be noted that the second elastic member 460 is a nitrogen spring.

[0031] By setting the relatively movable first support table 330 and the second support table 340, the first forming plate 440 and the second forming plate 450, and combining the switchable locking piece 600, the precise control of the material flow is realized; when stamping the first boss, the locking piece 600 is locked, the die seat is deep-drawn as a whole to ensure the shape of the first boss; when stamping the second boss, the locking piece 600 is released, and the internal module (the first support table 330 and the first forming plate 440) can move relatively under the action of the first elastic member 350 and the second elastic member 460 to form flexible forming, effectively preventing the workpiece from breaking or wrinkling, and being particularly suitable for complex workpieces such as valve covers with multiple bosses. By one-time forming of the double-boss structure, the cumulative error caused by repeated positioning in multi-process production is fundamentally eliminated.

[0032] Specifically, please refer to Figure 6 and Figure 7 The guide assembly 430 includes a guide sleeve 431 fixed to the upper die plate 420 and a guide column 432 fixed to the first forming plate 440, the guide column 432 and the guide sleeve 431 are in sliding fit, the guide column 432 is externally sleeved with a third elastic member 433, and the two ends of the third elastic member 433 are respectively abutted against the upper die plate 420 and the first forming plate 440.

[0033] It should be noted that the third elastic member 433 is a spring.

[0034] The sliding fit of the guide column 432 and the guide sleeve 431 ensures the straightness and precision of the movement of the first forming plate 440 relative to the upper die plate 420, and the third elastic member 433 sleeved outside the guide column 432 not only provides the return force of the first forming plate 440, but also plays a buffering role at the moment of stamping to absorb part of the impact energy, protect the die working parts, and improve the stamping stability.

[0035] In addition, please refer to Figure 9 The bottom of the upper die plate 420 is fixedly connected with a hydraulic oil cylinder 401, the output end of the hydraulic oil cylinder 401 is fixedly connected with a punch 402, and the center hole 403 is formed in the middle of the pressing plate 470 and the punch 320, please refer to Figure 2 A plurality of waste passages 240 are formed in the precision indexing turntable 210, and the waste passages 240 are coaxial with the corresponding center holes 403.

[0036] By setting the hydraulic oil cylinder 401 and the punch 402 on the upper die plate 420, forming the center hole 403 in the pressing plate 470 and the punch 320, and setting the waste passage 240 on the precision indexing turntable 210, the device can not only form double bosses, but also punch the center of the workpiece at the same time, completing two processes in one step, further improving the production efficiency, and realizing the automatic removal of the blanking waste, keeping the die clean, and finally forming the shape of the valve cover as shown in Figure 13 .

[0037] Please refer to Figure 2 , the rack 100 is provided with a waste collection box 110, which is located directly below the upper die seat 400. The waste collection box 110 can collect the waste falling from the waste channel 240, avoiding the accumulation of waste on the rack 100, affecting the operation of the equipment or the working environment, keeping the production site clean and facilitating the centralized treatment of waste.

[0038] Please refer to Figure 9 , the fixed-point lubrication mechanism 500 is integrated in the first forming plate 440 and the second forming plate 450. The fixed-point lubrication mechanism 500 integrated in the forming plate can directly and automatically lubricate the precise sliding fit surface, reduce wear and tear, and ensure smooth long-term operation of the first forming plate 440 and the second forming plate 450, maintaining the forming precision.

[0039] Specifically, please refer to Figure 9 , Figure 10 and Figure 11 , the fixed-point lubrication mechanism 500 includes an oil channel 510 opened in the first forming plate 440 and the second forming plate 450, and an oil groove 520 arranged on the sliding fit surface of the first forming plate 440 and the second forming plate 450. The inlet of the oil channel 510 is connected with a centralized oil supply connector 530. It should be noted that the centralized oil supply connector 530 penetrates the upper die plate 420, and the centralized oil supply connector 530 on the first forming plate 440 is in sliding connection with the upper die plate 420, and the centralized oil supply connector 530 on the second forming plate 450 is in fixed connection with the upper die plate 420.

[0040] Through the built-in oil channel 510 and the oil groove 520 on the fit surface, the lubricating oil can be directly delivered to the sliding interface that needs lubrication most. The centralized oil supply connector 530 is convenient for external automatic lubrication system, realizing automatic oil supply at regular intervals and quantity, avoiding the inconvenience of manual lubrication, ensuring the lubrication effect, and reducing the maintenance workload.

[0041] Please refer to Figure 9 , the outlet of the oil groove 520 is detachably connected with a lubricating block 540 made of wear-resistant material. The lubricating block 540 is located at the bottom corner of the first forming plate 440 and the second forming plate 450, respectively. The lubricating block 540 made of wear-resistant material is arranged at the easily-worn position of the bottom corner, directly facing the workpiece and friction, improving the durability of the mold. The detachable design of the lubricating block 540 makes it possible to replace it individually after wear and tear, without the need to replace the entire expensive first forming plate 440 or second forming plate 450, greatly reducing the maintenance cost and time.

[0042] Please refer to Figure 11The lubricating block 540 includes a shaped portion 541, a lubricating portion 542, a cooling portion 543, and a clamping portion 544. The shaped portion 541 is located between the lubricating portion 542 and the cooling portion 543. The clamping portion 544 is fixed in the oil groove 520 by a fastening screw 545. The lubricating portion 542, the cooling portion 543, and the clamping portion 544 each have a network of micro-holes 546 that are in communication with each other and with the oil channel 510. The working surfaces of the lubricating portion 542 and the cooling portion 543 each have a network or spiral oil guide pattern 547.

[0043] The coordination of the spot lubrication mechanism 500 during the stamping process is as follows: First step: The lubricating portion 542 establishes a solid initial lubricating film Timing and action: At the beginning of the stamping process, the lubricating portion 542 first contacts the workpiece surface. The oil guide pattern 547 on its working surface rapidly spreads the lubricating oil. Before the shaped portion 541 reaches, a uniform and sufficient lubricating film is formed on the surface of the blank.

[0044] Synergistic value: This pre-lubricating film is the first and most important line of defense for protecting the workpiece surface. It ensures that when the smooth shaped portion 541 begins to extrude the material, it is working in a low-friction coefficient environment, avoiding direct dry friction between the material and the die from the source, and fundamentally preventing workpiece scratches.

[0045] Second step: The shaped portion 541 performs precision shaping under the protection of the oil film Timing and action: Following closely, the shaped portion 541 with a smooth arc surface extrudes and shapes the pre-lubricated material. Its smooth surface does not leave any lines on the workpiece surface, ensuring the smoothness and dimensional accuracy of the valve cover boss outer wall.

[0046] Lubrication guarantee: Main guarantee: The initial lubricating film established by the lubricating portion 542 is carried into the working area of the shaped portion 541 during material flow, continuing to play a friction-reducing role.

[0047] Auxiliary guarantee: The cooling portion 543 continuously outputs lubricating oil during the shaping process. These lubricating oils flow along the shaped area, mainly used to reinforce and maintain the lubrication state of the contact points, preventing the rupture of the oil film under extreme pressure.

[0048] Synergistic value: This design achieves decoupling of the lubrication function and the shaping function. The smooth shaping surface ensures the appearance quality of the product, while the pre-positioning and permeation lubrication method ensures the smoothness of the shaping process. Both of them work together to solve the two difficult problems of surface quality and shaping difficulty.

[0049] Third step: Cooling by the cooling portion 543 and post-lubrication to consolidate the shaping quality Action timing and action: after the forming is basically completed, the cooling part 543 contacts the surface of the formed workpiece, and the oil guide pattern 547 on the cooling part 543 applies lubricating oil to the surface of the workpiece and takes away a large amount of heat generated by plastic deformation and friction.

[0050] Synergistic value: Cooling and shaping: control the temperature of the workpiece, reduce deformation and springback caused by overheating, and stabilize the product size.

[0051] Auxiliary demolding: provide lubrication for workpiece demolding to prevent workpiece from sticking or jamming with the mold.

[0052] Process closed loop: it is in correspondence with the lubricating part 542, one is responsible for inlet lubrication, and the other is responsible for outlet cooling and lubrication, which constitutes a complete process protection closed loop.

[0053] Therefore, the lubricating block 540 is divided into a forming part 541, a lubricating part 542, a cooling part 543, and a clamping part 544, realizing multifunctional integration; the internal micro-pore network 546 ensures that the lubricating oil can uniformly penetrate the entire working surface, and the oil guide pattern 547 on the working surface helps the lubricating oil to spread on the contact surface to form a uniform oil film. This structure not only reduces friction, but also, during the stamping forming process of the workpiece, the lubricating part 542 is located at the front end of the stamping stroke, first outputs lubricating oil to the surface of the workpiece to be processed, then the forming part 541 extrudes the workpiece to make it into shape, and finally, the cooling part 543 is located at the rear end of the stamping stroke, outputs lubricating oil to the surface of the just-formed workpiece, which can take away part of the friction heat and workpiece heat, play a certain cooling effect, and further improve the forming conditions.

[0054] Please refer to Figure 11 , the working surface of the forming part 541 is an arc surface, the design of the arc surface avoids stress concentration at sharp corners, can more smoothly guide the flow of materials when contacting the sheet material, reduces the risk of scratching the surface of the workpiece, and is beneficial to improve the surface finish of the formed workpiece.

[0055] Please refer to Figure 3 and Figure 4 , the locking member 600 is arranged between the first support table 330 and the second support table 340, and between the first forming plate 440 and the second forming plate 450.

[0056] Specifically, please refer to Figure 4 , the locking member 600 includes drive cylinders 610 fixed on the second support table 340 and the second forming plate 450 respectively, the output end of the drive cylinder 610 is fixedly connected with a locking pin 620, and the outer wall of the first support table 330 and the first forming plate 440 is provided with a pin hole 630.

[0057] The locking and releasing are achieved by driving the locking pin 620 to insert or exit the pin hole 630 by using a driving cylinder 610 (such as a pneumatic cylinder or an oil cylinder), which is rapid and reliable in action, simple in power source, easy to integrate with the whole machine control system, realizes automatic and precise control, and ensures switching the locking state at the correct process time.

[0058] In the first stage, the locking member 600 is in the locking state to keep the first support table 330 and the second support table 340 and the first forming plate 440 and the second forming plate 450 relatively fixed; in the second stage, the locking member 600 is in the releasing state to allow the first support table 330 and the second support table 340 and the first forming plate 440 and the second forming plate 450 to move relatively.

[0059] By using the releasing state of the locking member 600, the die is converted from a rigid body into an intelligent system with multiple action sequences, which accurately simulates the process sequence of multi-step stamping within one stroke of the press 410, and the specific process is as follows: I. Cooperative work The role of the multi-station turret die frame 200 is to provide a parallel operation platform to achieve high efficiency and rhythm. The precise indexing turntable 210 is provided with a plurality of lower die seats 300, and the core role is to realize the circulation of the three stations of feeding, stamping and unloading.

[0060] Work flow: when a workpiece is subjected to stamping in the stamping station, the finished product can be taken out in the unloading station, and the new blank can be placed in the feeding station. After the stamping is completed, the turntable is indexed once, and the work of the three stations is switched to the next step at the same time, which greatly improves the production efficiency and hides the auxiliary time in the processing time.

[0061] The precise indexing turntable 210 ensures that each blank has a high repeat positioning accuracy when it reaches the stamping station, which is the basis for all subsequent precise forming.

[0062] The role of the locking member 600 is to realize the sequence forming of rigidity first and flexibility later within a single stroke.

[0063] II. Dynamic switching of the locking member 600 and four-stage forming process within a single stroke in the stamping station Before stamping: the blank is sent to the lower die seat 300, and the locking member 600 is in the locking state (the driving cylinder 610 drives the locking pin 620 to insert into the pin hole 630).

[0064] Stage one: rigid forming of the first boss in the locking state Action and structure cooperation: the press 410 drives the upper die holder 400 to move downward, and the second forming plate 450 is rigidly connected with the first forming plate 440 as a whole due to the locking of the locking member 600; the second support table 340 of the lower die is also rigidly connected with the first support table 330 as a whole.

[0065] At this time, the upper and lower dies contact the blank as two whole rigid blocks. The pressing plate 470 in the first forming plate 440 contacts the middle part of the workpiece, and the pressing plate 470 is in fine cooperation with the top of the male die 320 under the controllable pressure provided by the second elastic member 460, so as to force the material to be rapidly deep drawn to form the first boss of the valve cover, and at the same time, the peripheral material is pressed and flows.

[0066] The role of the locking member 600: Provide strong rigidity: ensure that the die has sufficient strength and stability when forming the first boss, the main shape, to avoid the influence of elastic deformation on the size accuracy.

[0067] Efficient force transmission: the capacity of the press 410 is fully and directly used for the deep drawing deformation of the material, to ensure that the first boss shape is full and accurate.

[0068] Stage two: switch to the release state, prepare for secondary forming Action and structure cooperation: After the first boss is formed, the upper die plate 420 continues to move downward by a predetermined distance, or a control system triggers a signal, the drive cylinder 610 of the locking member 600 acts, and the locking pin 620 is withdrawn, so that the locking member 600 changes to the release state, and at this time, the first forming plate 440 and the second forming plate 450 are released from the rigid connection, and the first support table 330 and the second support table 340 are also released from the rigid connection.

[0069] Stage three: flexible forming of the second boss in the release state Action and structure cooperation: The upper die holder 400 continues to move downward, and the second forming plate 450, which was originally part of the whole, can now move relative to the first forming plate 440 (compressing the third elastic member 433 on the guide assembly 430 thereof).

[0070] The role of the locking member 600: Realize flexible forming: the release state makes the elastic elements inside the die play a role, converting the huge impact force into controllable and soft pressure, which avoids the cracking or deformation that may be caused by directly performing rigid stamping on the already formed thin wall.

[0071] Optimize material flow: flexible pressure allows the material to be redistributed in a small range, to ensure the forming quality of the second boss, and to release the stress that the first boss may bear in secondary forming.

[0072] Stage four: punch in the middle of the valve cover Action and structure cooperation: at the end of the stroke of the upper die plate 420, the workpiece has been completely constrained, the hydraulic oil cylinder 401 on the upper die plate 420 drives the punch 402 to pass through the center hole 403 of the pressure plate 470 and the punch 320, realizing the punching in the middle of the valve cover, and finally the waste falls from the waste channel 240.

[0073] Return: the upper die holder 400 returns, and the parts of the mold are reset under the action of the elastic member, and the locking member 600 can be reset to the locking state during or after the return, preparing for the next working cycle.

[0074] It should be noted that please refer to Figure 1 , the rack 100 is provided with a feeding mechanism 120 and a discharging mechanism 130, please refer to Figure 12 , the feeding mechanism 120 and the discharging mechanism 130 both include a mounting base 101 fixed on the rack 100, a linear drive module 102 fixedly installed on the mounting base 101, a one-way cylinder 103 connected to the output end of the linear drive module 102, a two-way cylinder 104 fixed on the output end of the one-way cylinder 103, and a mechanical gripper 105 fixed on the output end of the two-way cylinder 104.

[0075] It should be noted that the linear drive module 102 is a cylinder, a hydraulic cylinder or an electric screw slide.

[0076] Through the cooperation of the linear drive module 102, the one-way cylinder 103, the two-way cylinder 104 and the mechanical gripper 105, automatic grabbing, moving and placing of the workpiece are realized. This structure can realize multi-degree-of-freedom action, accurately feed the blank into the mold or take out the finished product, thereby cooperating with the multi-station turret mold frame 200 to form a complete automatic production unit, significantly reducing labor cost and ensuring operation safety.

[0077] Although some specific embodiments of the present application have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration, not for limiting the scope of the present application. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A valve body stamping forming device, characterized in that, include: Rack (100); The multi-station turret mold frame (200) includes a precision indexing turntable (210) rotatably connected to the surface of the frame (100), wherein the precision indexing turntable (210) is driven by a cam indexer (230) by a servo motor (220) to achieve intermittent precision positioning; Multiple lower mold bases (300) are circumferentially and uniformly fixed on the surface of the precision indexing turntable (210). Each lower mold base (300) includes a lower template (310) with a forming cavity (360) in the middle, a punch (320) fixed in the middle of the forming cavity (360), a first support platform (330) sleeved on the outer wall of the punch (320), and a second support platform (340) sleeved on the outer wall of the first support platform (330). The first support platform (330) and the second support platform (340) are both fixedly connected to the lower template (310) by a first elastic element (350). The upper mold base (400) is driven by the press (410) to move away from or closer to the lower mold base (300) to achieve pressing and forming. It includes an upper template (420) fixedly connected to the output end of the press (410), a first forming plate (440) connected to the bottom of the upper template (420) through a guide component (430), a second forming plate (450) sleeved on the outer wall of the first forming plate (440), and a pressure plate (470) fixed in the inner cavity of the first forming plate (440) through a second elastic element (460). The bottom of the first forming plate (440) has a groove (480), and the pressure plate (470) is located in the groove (480). The second forming plate (450) is fixed to the bottom of the upper template (420). A fixed-point lubrication mechanism (500) is integrated within the first forming plate (440) and the second forming plate (450); A locking element (600) is disposed between the first support platform (330) and the second support platform (340), and between the first molding plate (440) and the second molding plate (450); When the first boss of the stamped workpiece is formed, the locking member (600) is in a locked state to keep the first support platform (330) and the second support platform (340) and the first forming plate (440) and the second forming plate (450) relatively fixed; while when the second boss of the stamped workpiece is formed, the locking member (600) is in a released state to allow relative movement between the first support platform (330) and the second support platform (340) and between the first forming plate (440) and the second forming plate (450).

2. The valve body stamping forming device according to claim 1, characterized in that, The locking component (600) includes a drive cylinder (610) fixed on the second support platform (340) and the second molding plate (450) respectively. The output end of the drive cylinder (610) is fixedly connected to a locking pin (620). The outer walls of the first support platform (330) and the first molding plate (440) are both provided with pin holes (630).

3. The valve body stamping forming device according to claim 2, characterized in that, The guide assembly (430) includes a guide sleeve (431) fixed to the upper template (420) and a guide post (432) fixed to the first forming plate (440). The guide post (432) is slidably engaged with the guide sleeve (431). A third elastic element (433) is sleeved on the outside of the guide post (432). The two ends of the third elastic element (433) abut against the upper template (420) and the first forming plate (440) respectively.

4. The valve body stamping forming device according to claim 3, characterized in that, The fixed-point lubrication mechanism (500) includes an oil passage (510) opened inside the first forming plate (440) and the second forming plate (450), and an oil groove (520) provided on the relative sliding mating surface of the first forming plate (440) and the second forming plate (450). The inlet of the oil passage (510) is connected to a centralized oil supply connector (530).

5. The valve body stamping forming device according to claim 4, characterized in that, The outlet of the oil tank (520) is detachably connected to a lubricating block (540) made of wear-resistant material, and the lubricating block (540) is located at the bottom corner of the first forming plate (440) and the second forming plate (450).

6. The valve body stamping forming apparatus according to claim 5, characterized in that, The lubricating block (540) includes a forming part (541), a lubrication part (542), a cooling part (543), and a snap-fit ​​part (544). The forming part (541) is located between the lubrication part (542) and the cooling part (543). The snap-fit ​​part (544) is fixed in the oil groove (520) by fastening screws (545). The interior of the lubrication part (542), the cooling part (543), and the snap-fit ​​part (544) are all distributed with interconnected microporous networks (546). The microporous networks (546) are connected to the oil passages (510). The working surfaces of the lubrication part (542) and the cooling part (543) are all covered with mesh-like or spiral-shaped oil guiding patterns (547).

7. The valve body stamping forming apparatus according to claim 6, characterized in that, The working surface of the forming part (541) is an arc surface.

8. A valve body stamping forming apparatus according to any one of claims 1 to 7, characterized in that, A hydraulic cylinder (401) is fixedly connected to the bottom of the upper template (420), and a punch (402) is fixedly connected to the output end of the hydraulic cylinder (401). A center hole (403) is opened in the middle of the pressure plate (470) and the punch (320). Multiple scrap channels (240) are opened on the precision indexing turntable (210), and the scrap channels (240) are coaxial with the corresponding center holes (403).

9. A valve body stamping forming apparatus according to claim 8, characterized in that, A waste collection box (110) is provided on the frame (100), and the waste collection box (110) is located directly below the upper mold base (400).

10. A valve body stamping forming apparatus according to claim 9, characterized in that, The frame (100) is provided with a feeding mechanism (120) and a unloading mechanism (130). The feeding mechanism (120) and the unloading mechanism (130) each include a mounting base (101) fixed on the frame (100), a linear drive module (102) fixedly mounted on the mounting base (101), a single-stroke cylinder (103) connected to the output end of the linear drive module (102), a double-stroke cylinder (104) fixed to the output end of the single-stroke cylinder (103), and a mechanical gripper (105) fixed to the output end of the double-stroke cylinder (104).

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