Punch forming die for precision metal part machining

Abstract

The invention relates to the field of metal stamping, in particular to a stamping forming die for precision metal part machining. The die comprises a die base, two side dies and a middle die, the two side dies are symmetrically installed in a stamping groove of the die base in a left-right mode, the lower middle portions of the two side dies are elastically and rotationally connected with the die base, and the middle die is located between the two side dies and arranged on the die base in the mode that the middle die can elastically move in the up-down direction. The middle die comprises a mounting block, a first comb tooth block and a second comb tooth block, through the arrangement of the middle die, a gap between the bottoms of the two side dies can be shielded, extrusion to the bottom of a workpiece during rotation of the side dies is avoided, through the arrangement of a first comb tooth block and a second comb tooth block, the number of parts, subjected to direct bending acting force, of the workpiece during stamping is increased, stamping stress is more uniform, and shaping is better after stamping is completed; and finished parts are high in quality.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of metal stamping, in particular to a stamping forming die for precision metal part machining. BACKGROUND

[0002] Stamping forming is one of the common ways to process precision metal parts (such as metal protection rings of mobile phone cameras and other mobile hardware), and stamping forming requires the use of a stamping die.

[0003] A pipe clamp stamping die is disclosed in Chinese patent document CN103658392A. When in use, the blank is placed on the positioning block, the cylindrical punch on the punch head is sleeved on the die handle and is pressed downward, the cylindrical punch pushes against one end of the swing die to make the swing die swing to the middle to extrude the blank to form around the cylindrical punch, and the stamping is completed. In the above-mentioned scheme, in order to facilitate the swinging of the swing die, the bottoms of the two swing dies have a gap, which decreases when the swing die swings to the middle, which easily causes extrusion to the blank, affects the surface quality of the blank, and even may cause extrusion protrusions to appear at the bottom of the blank, causing the finished part to fail. At the same time, the cylindrical punch and the swing die are used to cooperate to stamp, the blank is bent under the pressing action of the cylindrical punch, and then the swing die pushes and extrudes the top of the blank to the middle to form, the part of the blank which is not in contact with the cylindrical punch and the swing die is not directly pushed and extruded, and is passively bent, and the springback force of this part of the part after bending and forming is large, which easily causes the part to fail.

[0004] The information disclosed in the background section of this application is only intended to enhance the understanding of the general background of the application, and should not be considered as recognition or implicit acknowledgment in any form that this information constitutes prior art known to those skilled in the art. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application provides a stamping forming die for precision metal part machining to solve the problem of low quality of the parts after forming of the existing stamping forming die.

[0006] The stamping forming die for precision metal part machining of the present application adopts the following technical scheme: installed on a press, capable of stamping and processing workpieces, a pressure column is provided on the press, the pressure column is cylindrical, and the pressure column extends horizontally in the front-rear direction and can move up and down; The stamping forming die comprises: a die seat, the die seat is provided on the machine body; a stamping groove is formed in the middle of the die seat and extends through the top and front and rear; Two side molds are symmetrically installed in the stamping groove of the mold base, the middle and lower parts of the two side molds are rotationally connected with the mold base, a first elastic member is arranged between the side mold and the mold base, the elastic member is configured to make the upper part of the side mold fit the stamping groove in the initial state, and the two side molds can be adapted to the outer periphery of the pressing column after being rotationally buckled; A middle mold is arranged between the two side molds and is elastically movably arranged in the mold base in the up-down direction, the middle mold is above the two side molds in the initial state, and the middle mold can be embedded into the bottom of the two side molds and the upper surface of the middle mold is coplanar with the inner peripheral wall of the side mold when stamping is completed.

[0007] Optionally, the middle mold comprises a mounting block, a first comb tooth block and a second comb tooth block; the mounting block is slidably installed in the mold base in the up-down direction; The first comb tooth block and the second comb tooth block are arc-shaped and can be adapted to the pressing column and the side mold, the side close to each other of the first comb tooth block and the second comb tooth block is slidably inserted, and the sliding track is arc-shaped, the first comb tooth block and the second comb tooth block are slidably arranged in the mounting block, and the end of the first comb tooth block and the second comb tooth block inserted into each other is above the mounting block; The stamping forming mold further comprises a first transmission structure, the first transmission structure is configured to make the first comb tooth block and the second comb tooth block slide and extend in the direction away from each other before the mounting block moves downward to contact the side mold.

[0008] Optionally, the first transmission structure comprises a first rack and a first gear; The first rack has two, the two first racks are respectively connected with the first comb tooth block and the second comb tooth block, and the two first racks are slidably arranged inside the mounting block and face each other; the first gear is rotationally arranged inside the mounting block and is clamped between the two first racks, and the first gear is engaged with the two first racks; A rotating rod extending downward is rotationally arranged on the mounting block, the upper end of the rotating rod is connected with the first gear, a guide groove is arranged on the peripheral wall of the rotating rod, the guide groove comprises a first vertical section, a spiral section and a second vertical section connected in sequence from bottom to bottom, a limiting block is arranged on the mold base, a limiting protrusion is arranged on the limiting block, and the limiting protrusion is slidably arranged in the guide groove.

[0009] Optionally, a support rod is fixedly arranged at the bottom of the rotating rod, the support rod is slidably inserted into the mounting base, a second elastic member is sleeved on the support rod, and the second elastic member makes the support rod have a tendency to be in the upper end limit position.

[0010] Optionally, the inner peripheral wall of the side mold is provided with a plurality of strip grooves, the strip grooves on the corresponding side mold are adapted to the comb tooth strips of the first comb tooth block or the second comb tooth block, and a second rack is arranged in the strip groove; The first comb tooth block and the second comb tooth block are provided with rotatable second gears at the ends away from each other, the axes of the second gears extend forward and backward, and the two ends of the second gears are coaxially fixed with rolling pins capable of contacting the workpiece, and the second gears are engaged with the second gear rack when the first comb tooth block and the second comb tooth block are embedded in the strip-shaped groove in the side mold.

[0011] Optionally, the second gear rack is capable of moving in the strip-shaped groove, the strip-shaped groove is provided with a third elastic element, the third elastic element is in abutment with the second gear rack, and the third elastic element causes the second gear rack to have a tendency to be in the upper end limit position.

[0012] Optionally, the bottom upper side of the side mold is provided with a missing corner, the strip-shaped groove extends to the missing corner, the strip-shaped groove is provided with a blocking block, the blocking block is provided with a limiting rod, and the third elastic element is sleeved on the limiting rod.

[0013] Optionally, the first elastic element is a tension spring.

[0014] Optionally, the second elastic element is a compression spring.

[0015] Optionally, the third elastic element is a compression spring.

[0016] The stamping forming mold for precise metal part machining has the advantages that the intermediate mold is arranged between the two side molds, the workpiece is first contacted with the intermediate mold under the driving of the pressing column during stamping, the bottom of the workpiece is supported by the intermediate mold, the bottom of the workpiece is prevented from being directly contacted with the side mold, then the intermediate mold is contacted with the side mold and pushes the side mold downward along with the downward movement of the pressing column, the two side molds are rotated and the top portions of the two side molds are close to the pressing column, the gap between the bottoms of the two side molds is blocked by the intermediate mold, the bottom of the workpiece is not squeezed when the two side molds are rotated, the quality of the finished product part after stamping is improved, and the qualified rate of the finished product part is ensured.

[0017] Further, the intermediate mold is arranged to include the mounting block and the first comb tooth block and the second comb tooth block slidingly inserted into the two sides of the mounting block, the first comb tooth block and the second comb tooth block are stretched to the two sides and push the workpiece upward and inward along the outer periphery of the pressing column during the stamping process, the workpiece is bent and fitted to the pressing column, the part of the workpiece subjected to the bending force is increased, the stress is more uniform, the workpiece is better shaped after stamping, and the yield rate is improved.

[0018] Further, the rolling pins are arranged at the distal ends of the first comb tooth block and the second comb tooth block away from each other, the workpiece is pushed to the upward opening direction of the stamping groove through the rotation of the rolling pins in the last stage of stamping, the friction between the workpiece and the side mold is reduced, the workpiece is stretched to the top to assist in discharging, the workpiece is prevented from being wrinkled due to material accumulation inside the side mold, the surface quality of the workpiece is improved, and the yield rate of the finished product part is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only show some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without any creative effort.

[0020] Figure 1 Structure schematic view of the stamping forming die for precision metal part machining installed on a press machine according to the present application; Figure 2 Structure schematic view of the stamping forming die for precision metal part machining installed on a press machine according to the present application; Figure 1 Another angle schematic view; Figure 3 Structure schematic view of the stamping forming die for precision metal part machining installed on a press machine according to the present application; Figure 4 Structure schematic view of the stamping forming die for precision metal part machining installed on a press machine according to the present application; Figure 3 Structure schematic view of the stamping forming die for precision metal part machining installed on a press machine according to the present application; Figure 5 Structure schematic view of the stamping forming die for precision metal part machining installed on a press machine according to the present application; Figure 6 Structure schematic view of the stamping forming die for precision metal part machining installed on a press machine according to the present application; Figure 7 Structure schematic view of the stamping forming die for precision metal part machining installed on a press machine according to the present application; Figure 6 Enlarged view of I in the structure schematic view of the stamping forming die for precision metal part machining installed on a press machine according to the present application; Figure 8 Structure schematic view of the stamping forming die for precision metal part machining installed on a press machine according to the present application; Figure 9 Structure schematic view of the stamping forming die for precision metal part machining installed on a press machine according to the present application;

[0021] In the drawings: 100, press machine; 102, press column; 104, installation base; 105, second elastic member; 106, supporting rod; 200, stamping forming die; 210, die seat; 211, limiting block; 220, side die; 2201, strip-shaped groove; 2202, angle defect; 221, second rack; 222, third elastic member; 223, blocking block; 230, intermediate die; 231, installation block; 232, first comb tooth block; 233, second comb tooth block; 2331, connecting plate; 234, first rack; 235, first gear; 236, rotating rod; 2361, guide groove; 237, second gear; 238, needle roller; 240, first elastic member; 300, workpiece. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0023] As shown in Figures 1 to 9 The stamping forming die 200 provided by the embodiment of the present application is installed on the press 100, and can perform stamping processing on the workpiece 300. The press 100 is provided with a pressing column 102 and a power mechanism. The pressing column 102 is in a cylindrical shape and extends horizontally in the front-rear direction. The pressing column 102 can move up and down under the driving of the power mechanism.

[0024] The stamping forming die 200 comprises a die seat 210 and two side dies 220. The press 100 is provided with a mounting base 104, and the die seat 210 is arranged on the mounting base 104. The middle part of the die seat 210 is provided with a stamping groove which penetrates through the front-rear direction and the top. The two side dies 220 are symmetrically arranged in the stamping groove of the die seat 210. The middle-lower part of the two side dies 220 is rotationally connected with the die seat 210. A first elastic member 240 is arranged between the side die 220 and the die seat 210. The first elastic member 240 is preferably a tension spring. The first elastic member 240 is configured to make the upper part of the side die 220 fit the stamping groove in the initial state. After the two side dies 220 are rotationally buckled, the two side dies 220 can be adapted to the outer periphery of the pressing column 102. During stamping, the workpiece 300 is placed on the upper surface of the die seat 210 and covers the upper opening of the stamping groove. The power mechanism controls the pressing column 102 to move downward, so as to stamp the workpiece 300 toward the inside of the stamping groove. When the workpiece 300 is contacted with the bottom of the two side dies 220 by the pressing column 102, the two side dies 220 rotate toward the middle and gradually wrap the pressing column 102 and the workpiece 300 as the pressing column 102 continues to move downward. The side die 220 and the pressing column 102 cooperate to stamp and form the workpiece 300.

[0025] It can be understood that, in order to facilitate the rotation of the side die 220, the bottom of the two side dies 220 has a gap. After the workpiece 300 contacts the bottom of the side die 220 and pushes the side die 220 downward, the side die 220 is rotationally buckled and wraps the workpiece 300 and the pressing column 102. In this process, the gap between the bottoms of the two side dies 220 gradually decreases, which may cause extrusion to the bottom of the workpiece 300, affect the surface quality of the bottom of the workpiece 300, and even cause the bottom of the workpiece 300 to form an extrusion protrusion, resulting in failure of the finished product part after stamping.

[0026] To this end, in the scheme of the embodiment, the stamping forming die 200 of the application further comprises an intermediate die 230, which is located between the two side dies 220 and is arranged in the die seat 210 in an elastically movable manner up and down, and in the initial state, the intermediate die 230 is above the two side dies 220, and when the stamping is completed, the intermediate die 230 can be embedded into the bottom of the two side dies 220, and the upper surface of the intermediate die 230 is coplanar with the inner peripheral wall of the side die 220.

[0027] Through the arrangement of the intermediate die 230, when stamping, the workpiece 300 is first in contact with the intermediate die 230, the intermediate die 230 supports the bottom of the workpiece 300, avoiding the direct contact of the bottom of the workpiece 300 with the side die 220, and then, with the downward movement of the pressing column 102, the intermediate die 230 is in contact with the side die 220 and pushes the side die 220 downward, the two side dies 220 rotate and the top part approaches the pressing column 102, and because the intermediate die 230 blocks and seals the gap between the bottoms of the two side dies 220, the bottom of the workpiece 300 will not be squeezed when the two side dies 220 rotate, thereby improving the quality of the finished parts after stamping and ensuring the qualified rate of the finished parts.

[0028] In further embodiments, with reference to Figure 8 The intermediate die 230 comprises a mounting block 231, a first comb tooth block 232 and a second comb tooth block 233; the mounting block 231 is slidably mounted on the die seat 210 in an up and down manner; The first comb tooth block 232 and the second comb tooth block 233 are arc-shaped and can be adapted to the pressing column 102 and the side die 220, the side of the first comb tooth block 232 and the second comb tooth block 233 close to each other is slidably inserted and the sliding track is arc-shaped, the first comb tooth block 232 and the second comb tooth block 233 are slidably arranged on the mounting block 231 and the end of the mutual insertion is above the mounting block 231; The stamping forming die 200 of the application further comprises a first transmission structure, which is configured to make the first comb tooth block 232 and the second comb tooth block 233 slide and extend in a direction away from each other before the mounting block 231 is lowered to be in contact with the side die 220.

[0029] It can be understood that in the process of stamping, the workpiece 300 is bent downward under the action of the pressing column 102 and the die seat 210, and then under the action of the side die 220, the top part of the workpiece 300 approaches the middle and is attached to the pressing column 102 until it is completely formed. This stamping process causes the positions on both sides of the workpiece 300 which are not in contact with the side die 220 and the pressing column 102 to be passively formed, and the stress is uneven, and after the stamping of the finished parts, the positions on both sides of the parts which are not in contact with the side die 220 and the pressing column 102 have a large springback force, which easily causes the parts to fail.

[0030] The scheme of the embodiment is that when the pressing column 102 drives the workpiece 300 to contact the first comb tooth block 232 and the second comb tooth block 233, with the continuous downward movement of the pressing column 102, the first comb tooth block 232, the second comb tooth block 233 and the mounting block 231 move downward, under the action of the first transmission structure, the first comb tooth block 232 and the second comb tooth block 233 gradually slide and extend to the left and right sides, and when the first comb tooth block 232 and the second comb tooth block 233 extend, the workpiece 300 is pushed upward and inward along the outer periphery of the pressing column 102, so that the workpiece 300 is bent and fitted in the direction of the pressing column 102, the part of the workpiece 300 subjected to the bending force is increased, the stress is more uniform, the workpiece 300 is better shaped after stamping, and the yield rate is improved.

[0031] In further embodiments, with reference to Figure 8 , the first transmission structure comprises a first rack 234 and a first gear 235; The first rack 234 has two, and the two first racks 234 are respectively connected with the first comb tooth block 232 and the second comb tooth block 233, and the two first racks 234 are slidingly arranged inside the mounting block 231 and face each other; the first gear 235 is rotatably arranged inside the mounting block 231 and clamped between the two first racks 234, and the first gear 235 is engaged with the two first racks 234; A rotating rod 236 extending downward is rotatably arranged on the mounting block 231, the upper end of the rotating rod 236 is connected with the first gear 235, a guide groove 2361 is arranged on the peripheral wall of the rotating rod 236, the guide groove 2361 comprises a first vertical section, a spiral section and a second vertical section connected in sequence from bottom to top, a limiting block 211 is arranged on the mold base 210, a limiting protrusion is arranged on the limiting block 211, and the limiting protrusion is slidingly arranged in the guide groove 2361.

[0032] When the mounting block 231 is arranged at the upper end limit position, the limiting protrusion is arranged at the position close to the upper end of the second vertical section of the guide groove 2361, that is, the position where the second vertical section and the spiral section are about to meet. When the workpiece 300 is contacted with the first comb tooth block 232 and the second comb tooth block 233 by the pressing column 102, with the continuous downward movement of the pressing column 102, the first comb tooth block 232, the second comb tooth block 233 and the mounting block 231 move downward, when the rotating rod 236 moves downward to the position where the limiting protrusion enters the spiral section, under the cooperation of the limiting protrusion and the spiral section of the guide groove 2361, the rotating rod 236 rotates and drives the first gear 235 to rotate, the first gear 235 drives the two first racks 234 to move, so that the first comb tooth block 232 and the second comb tooth block 233 move away from each other; when the mounting block 231 moves downward to the position where the limiting protrusion is located in the first vertical section of the guide groove 2361, the rotating rod 236 stops rotating, the first comb tooth block 232 and the second comb tooth block 233 no longer extend, and at this time the mounting block 231 has not contacted with the side mold 220.

[0033] Further, in order to facilitate the structure arrangement, the bottom of the first comb tooth block 232 and the second comb tooth block 233 is provided with a downwardly extending connecting plate 2331, the first rack 234 is arranged on the corresponding connecting plate 2331, and the inner part of the mounting block 231 is provided with an arc-shaped sliding groove matched with the arc of the first comb tooth block 232 and the second comb tooth block 233, and the first rack 234 is slidingly arranged in the arc-shaped sliding groove.

[0034] In a further embodiment, in order to facilitate the resetting of the mounting block 231, the bottom of the rotating rod 236 is fixedly provided with a supporting rod 106, the supporting rod 106 is slidingly inserted into the mounting base 104, the upper end of the supporting rod 106 is provided with a limiting plate to limit the upper end limit position of the supporting rod 106, and the supporting rod 106 is sleeved with a second elastic member 105, so that the supporting rod 106 has a tendency to be at the upper end limit position.

[0035] According to the scheme of the embodiment, when the mounting block 231 moves downward, the supporting rod 106 is driven by the rotating rod 236 to move downward synchronously, and the second elastic member 105 is compressed. After the stamping is completed, the pressing column 102 moves upward, the supporting rod 106 moves upward under the action of the second elastic member 105, and the first comb tooth block 232, the second comb tooth block 233 and the mounting block 231 are driven by the rotating rod 236 to reset upward. During the resetting process, when the limiting protrusion cooperates with the spiral section of the guide groove 2361, the rotating rod 236 rotates, the first comb tooth block 232 and the second comb tooth block 233 move close to each other, and are retracted inward.

[0036] In a further embodiment, the inner circumferential wall of the side mold 220 is provided with a plurality of strip-shaped grooves 2201, the strip-shaped grooves 2201 on the corresponding side mold 220 are matched with the comb tooth strips of the first comb tooth block 232 or the second comb tooth block 233, the strip-shaped grooves 2201 are provided with a second rack 221, one end of the first comb tooth block 232 and the second comb tooth block 233 away from each other is provided with a second gear 237 capable of rotating, the axis of the second gear 237 extends forward and backward, and the two ends of the second gear 237 are coaxially fixedly provided with a roller pin 238 capable of contacting the workpiece 300. When the first comb tooth block 232 and the second comb tooth block 233 are embedded in the strip-shaped grooves 2201 of the side mold 220, the second gear 237 is engaged with the second rack 221.

[0037] It can be understood that when the side mold 220 is about to rotate to the position, the gap between the workpiece 300 and the side mold 220 is reduced, and as the side mold 220 continues to rotate, the workpiece 300 continues to elongate to both ends, but because the gap between the side mold 220 and the workpiece 300 is small, the friction between the workpiece 300 and the side mold 220 increases, which may hinder the smooth elongation of the workpiece 300, so that the workpiece 300 forms wrinkles in the side mold 220, or has defects such as poor surface quality.

[0038] The scheme of the embodiment is that when the side mold 220 is about to rotate into place, the first comb tooth block 232 and the second comb tooth block 233 begin to embed into the side mold 220, the second gear 237 and the second rack 221 are in meshing, with the continuous rotation of the side mold 220, the second rack 221 rotates with the side mold 220, the second rack 221 and the second gear 237 produce relative movement, the second gear 237 rotates and drives the roller pin 238 to rotate, when the roller pin 238 rotates, the friction between the workpiece 300 and the side mold 220 can be reduced, and the workpiece 300 can be assisted to stretch and discharge to the top, so that the workpiece 300 is prevented from being wrinkled due to material accumulation inside the side mold 220, the surface quality of the workpiece 300 is improved, and the yield of finished parts is further improved.

[0039] In a further embodiment, the second rack 221 can move in the strip-shaped groove 2201, the third elastic member 222 is arranged in the strip-shaped groove 2201, the third elastic member 222 abuts against the second rack 221, and the third elastic member 222 makes the second rack 221 have a tendency to be in the upper end limit position.

[0040] It can be understood that in the last stage of stamping, that is, when the side mold 220 is about to rotate into place, the gap between the workpiece 300 and the side mold 220 will be slightly different due to the thickness of the workpiece 300, stamping error and other factors, and the amount of stretching and discharging of the workpiece 300 to the outside will also have certain differences. In order to adapt to this difference, the scheme of the embodiment is that the second rack 221 is arranged to be slidable, if the amount of stretching (discharging) of the workpiece 300 to the outside does not match the amount of relative displacement of the second gear 237 and the second rack 221, at this time, the error is compensated by the movement of the second rack 221, so that the adaptability of the application is stronger.

[0041] Further, in order to facilitate the structure arrangement, the bottom upper side of the side mold 220 is provided with a missing corner 2202 to accommodate the mounting block 231 and the connecting plate 2331 at the bottom of the first comb tooth block 232 and the second comb tooth block 233, and the mounting block 231 is convenient for pushing the side mold 220.

[0042] Further, in order to facilitate assembly and manufacturing, the strip-shaped groove 2201 extends to the missing corner 2202, the plug 223 is arranged in the strip-shaped groove 2201, the limiting rod is arranged on the plug 223, and the third elastic member 222 is sleeved on the limiting rod.

[0043] Further, the second elastic member 105 and the third elastic member 222 are preferably compression springs.

[0044] In combination with the above embodiment, the use principle and working process of the application are as follows: The initial state is shown in FIG. 1Figure 1 、 Figure 2 and Figure 3 , under the action of the first elastic member 240, the upper part of the two side molds 220 is attached to the side wall of the mold base 210, under the action of the second elastic member 105, the intermediate mold 230 moves up to be separated from the bottom of the side mold 220 and is located in the upper part of the stamping groove, and the second rack 221 is in abutment with the upper limiting surface of the strip-shaped groove 2201 on the side mold 220 under the action of the third elastic member 222.

[0045] When stamping the part, referring to Figure 1 , the workpiece 300 is placed on the upper surface of the mold base 210 and covers the upper opening of the stamping groove, the power mechanism is started, the power mechanism drives the pressing column 102 to move downward, the workpiece 300 is bent under the limiting action of the mold base 210 and the pressing action of the pressing column 102 and first contacts the intermediate mold 230 (specifically the first comb tooth block 232 and the second comb tooth block 233), after the workpiece 300 contacts the intermediate mold, with the continuous pressing of the pressing column 102, the intermediate mold 230 is pressed synchronously, the rotating rod 236 is lowered synchronously with the mounting block 231, the rotating rod 236 is lowered to the position where the protrusion on the limiting block 211 is located behind the spiral section of the guide groove 2361, under the cooperation of the protrusion on the limiting block 211 and the spiral section, the drill rod 236 rotates around its own axis, the rotating rod 236 drives the first gear 235 to rotate, the first gear 235 drives the first comb tooth block 232 and the second comb tooth block 233 to slide out relative to the mounting block 231 through the first rack 234, in the process of sliding out of the first comb tooth block 232 and the second comb tooth block 233, the needle roller 238 thereon contacts the workpiece 300 and pushes the workpiece 300 upward along the trajectory of the peripheral wall of the pressing column 102, assisting the deformation of the bottom of the workpiece 300, making the deformation of the bottom of the workpiece 300 more stable and reliable and the stress more uniform, improving the qualified rate of the finished part after stamping of the workpiece 300. When the rotating rod 236 moves downward by a certain distance, the first vertical section of the guide groove 2361 on the rotating rod 236 cooperates with the protrusion on the limiting block 211, the rotating rod 236 stops rotating, the first comb tooth block 232 and the second comb tooth block 233 no longer extend, and the bottom of the side mold 220 has not contacted the mounting block 231 at this time.

[0046] Thereafter, the pressing column 102 continues to move downward, the intermediate mold 230 continues to move downward, referring to Figure 6, the mounting block 231 contacts the lower end of the side die 220 and pushes the side die 220, the side die 220 rotates under the pushing of the mounting block 231, when the side die 220 is about to rotate to the limit position, that is, the workpiece 300 is about to complete the stamping (the last stage of stamping), the first comb tooth block 232 and the second comb tooth block 233 begin to embed the side die 220, the second gear 237 meshes with the second rack 221, as the side die 220 continues to rotate, the second rack 221 and the second gear 237 displace, and the displacement direction is that the second rack 221 moves downward relative to the second gear 237, therefore the second gear 237 rotates and drives the needle roller 238 to rotate, the rotating direction of the second gear 237 and the needle roller 238 is outward relative to the workpiece 300 (that is, the needle roller 238 on the left rotates counterclockwise, and the needle roller 238 on the right rotates clockwise), the rotation of the needle roller 238 helps the workpiece 300 to elongate in the direction of the opening of the stamping groove, and reduces the friction between the workpiece 300 and the side die 220. When the side die 220 rotates to the position, the intermediate die 230 completely embeds the side die 220, the upper surface of the intermediate die 230 is coplanar with the inner wall of the side die 220, and the stamping work of the workpiece 300 is completed.

[0047] Because the amount of outward elongation of the discharged material of different workpieces 300 is slightly different in the last stage of stamping, and the time of outward elongation of the discharged material is also slightly different, the second rack 221 is arranged to be slidable, so as to adapt to different situations.

[0048] The above only describes the preferred embodiments of the present application and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A stamping die for machining precision metal parts, characterized in that, Installed on a press, it can stamp workpieces. The press is equipped with a pressure column, which is cylindrical and extends horizontally in the front-to-back direction and can move up and down. Stamping dies include: A mold base is set on the machine body; a stamping groove that runs through the front, back and top is opened in the middle of the mold base; Two side dies are symmetrically installed in the stamping groove of the die holder. The lower middle part of the two side dies is rotatably connected to the die holder. A first elastic element is provided between the side dies and the die holder. The elastic element is configured to make the upper part of the side dies fit with the stamping groove in the initial state. After the two side dies are rotated and locked, they can fit with the outer periphery of the pressure column. The intermediate mold is located between the two side molds and is elastically movable in the mold base in the vertical direction. In the initial state, the intermediate mold is above the two side molds. When the stamping is completed, the intermediate mold can be embedded into the bottom of the two side molds and the upper surface of the intermediate mold is coplanar with the inner peripheral wall of the side molds.

2. The stamping die for precision metal parts processing according to claim 1, characterized in that, The intermediate mold includes a mounting block, a first comb tooth block, and a second comb tooth block; the mounting block is slidably mounted on the mold base. The first and second comb blocks are arc-shaped and can be adapted to the pressure column and the side mold. The first and second comb blocks are slidably inserted on the side that is close to each other and the sliding trajectory is arc-shaped. The first and second comb blocks are slidably set on the mounting block and the end that is inserted into each other is located above the mounting block. The stamping die further includes a first transmission structure, which is configured to allow the first comb block and the second comb block to slide out in a direction away from each other before the mounting block moves down to contact the side die.

3. The stamping die for precision metal parts processing according to claim 2, characterized in that, The first transmission structure includes a first rack and a first gear; There are two first racks, which are respectively connected to the first comb block and the second comb block. The two first racks are slidably disposed inside the mounting block and face to face. The first gear is rotatably disposed inside the mounting block and sandwiched between the two first racks. The first gear meshes with both first racks. The mounting block is rotatably equipped with a downwardly extending rotating rod, the upper end of which is connected to the first gear. The peripheral wall of the rotating rod is provided with a guide groove, which includes a first vertical section, a spiral section, and a second vertical section connected sequentially from bottom to bottom. The mold base is provided with a limit block, and the limit block is provided with a limit protrusion. The limit protrusion is slidably disposed in the guide groove.

4. The stamping die for precision metal parts processing according to claim 3, characterized in that, A support rod is fixedly installed at the bottom of the rotating rod. The support rod is slidably inserted into the mounting base. A second elastic element is sleeved on the support rod, which makes the support rod tend to be in the upper limit position.

5. A stamping die for precision metal parts processing according to claim 2, characterized in that, The inner peripheral wall of the side mold is provided with several strip grooves, and the strip grooves on the corresponding side molds are adapted to the comb teeth of the first comb block or the second comb block, and the second tooth is provided in the strip groove; The first comb block and the second comb block are each provided with a rotatable second gear at their far ends. The axis of the second gear extends back and forth, and the two ends of the second gear are coaxially fixed with needle rollers. The needle rollers can contact the workpiece. When the first comb block and the second comb block are embedded in the strip groove in the side mold, the second gear meshes with the second rack.

6. The stamping die for precision metal parts processing according to claim 5, characterized in that, The second rack can move within the slot, and a third elastic element is provided within the slot. The third elastic element abuts against the second rack, and the third elastic element causes the second rack to tend to be at its upper limit position.

7. A stamping die for precision metal parts processing according to claim 6, characterized in that, The bottom upper side of the side mold is provided with a notch, the strip groove extends to the notch, a block is provided in the strip groove, a limit rod is provided on the block, and the third elastic element is sleeved on the limit rod.

8. A stamping die for precision metal parts processing according to claim 1, characterized in that, The first elastic element is a tension spring.

9. A stamping die for precision metal parts processing according to claim 4, characterized in that, The second elastic element is a compression spring.

10. A stamping die for machining precision metal parts according to claim 6, characterized in that, The third elastic element is a compression spring.

Images