Method for processing a contact finger groove and groove bottom recess and a forming die

Abstract

The present application relates to the technical field of production and manufacturing of contact finger for high-voltage switch, and particularly relates to a processing method and forming die of contact finger groove and groove bottom recess. The strip-shaped plate is step by step conveyed from front to back, the conveying step distance is equal to the sum of the contact finger groove width and the elastic contact piece width, the strip-shaped plate is advanced by one conveying step distance on the conveying path, the forming die performs one die closing action, one contact finger groove is punched out by the contact finger groove punching die core unit in the same die closing action, and at least two recess forming positions of the strip-shaped plate which are spaced apart by one step distance in the conveying direction are sequentially formed by the groove bottom recess compression die core unit, and one recess forming position corresponds to the groove bottom of the punched contact finger groove in the die closing action. The processing method of the contact finger groove and the groove bottom recess can support, position and correct the shape of the last formed groove bottom recess when processing the next groove bottom recess, so that the deformation of the last formed groove bottom recess is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of production and manufacturing of contact fingers for high-voltage switches, and in particular to a processing method and forming die for contact finger grooves and groove bottom recesses. BACKGROUND

[0002] A contact finger is an important component in high-voltage switch equipment. A structure of a self-force type contact finger commonly used in existing high-voltage switch equipment is shown in FIG. 1, which includes two contact finger pieces 1. Each contact finger piece 1 includes an arc-shaped base body 101 and a plurality of elastic contact pieces 102 arranged on the upper portion of the arc-shaped base body 101. All of the elastic contact pieces 102 are uniformly distributed along the circumferential direction of the arc-shaped base body 101. There is a contact finger groove 103 between adjacent elastic contact pieces 102. The bottom of each contact finger groove 103 is provided with a groove bottom recess 104. The upper portion of each elastic contact piece 102 is bent to form an electrical contact segment 105 for electrical connection with a contact. Figure 1 The machining precision of the elastic contact pieces directly affects the current-carrying performance of the contact finger. Since the number of contact finger grooves and groove bottom recesses is large and they are densely arranged, the spacing between adjacent groove bottom recesses is only 2 mm. Therefore, the machining precision of the contact finger grooves and groove bottom recesses is extremely high.

[0003] For the machining of the contact finger grooves and groove bottom recesses, the traditional machining method mainly uses metal milling. The machining time is long and the contact finger after machining has slight deformation. Currently, some switch companies have proposed different contact finger forming methods. For example, a forming method for a static end main contact finger is disclosed in Chinese patent application publication No. CN112719035A. The forming method mainly includes the following steps: (1) cutting a copper plate into a strip-shaped plate with a suitable length; (2) feeding the strip-shaped plate into a contact finger forming die from one side of the die frame. A contact finger groove is punched on the strip-shaped plate every time the strip-shaped plate advances by one punching position in the contact finger forming die. The part between adjacent contact finger grooves is an elastic contact piece. The machining of all contact finger grooves is completed; (3) cutting the strip-shaped plate according to the target workpiece length; (4) placing the cut strip-shaped plate in a V-head forming die. The upper portion of each elastic contact piece is bent to form an electrical contact segment by the V-head forming die; (5) extruding and bending the product obtained in step (4) into an arc shape using a profiling die to obtain a contact finger blank; (6) chamfering and drilling the contact finger blank according to the target size to obtain a contact finger finished product.

[0004] Although the prior art discloses how to punch out the finger slot on the strip-shaped plate by the forming die, it does not disclose how to form the groove bottom recess at the bottom of the finger slot. Then, for the forming of the groove bottom recess, there are two commonly used forming methods, the first one is that the recess forming structure for forming the groove bottom recess is also arranged on the forming die corresponding to the part of the finger slot, and one finger slot is punched out on the strip-shaped plate and the corresponding groove bottom recess of the finger slot is formed at the same time by the upper and lower dies every time the die is closed, the second one is that the strip-shaped plate is moved to another forming die after all the finger slots are punched out on the strip-shaped plate by a set of die, and then all the groove bottom recesses are formed. However, no matter which forming method is used, there is a problem of low processing precision. Because the strip-shaped plate is thin, the number of groove bottom recesses on the strip-shaped plate is large and densely arranged, and the corresponding part of the strip-shaped plate bears a large extrusion force when the groove bottom recess is formed, and the metal structure of the extruded part will be largely displaced along the plate surface, which leads to deformation of the last formed groove bottom recess when the next groove bottom recess is formed, and even leads to deformation of the processed elastic contact piece, so that the relative position of the elastic contact piece and the groove bottom recess cannot be guaranteed. SUMMARY

[0005] The present application aims to provide a processing method of finger slot and groove bottom recess, to solve the problem of low processing precision and the problem that the relative position of the elastic contact piece and the groove bottom recess cannot be guaranteed in the processing method of the prior art finger slot and groove bottom recess, and to provide a forming die to solve the problem of low processing precision of the prior art forming die.

[0006] To achieve the above-mentioned purpose, the processing method of finger slot and groove bottom recess adopts the following technical scheme:

[0007] A processing method of finger slot and groove bottom recess, the strip-shaped plate is step-by-step conveyed from front to back, the conveying step distance is equal to the sum of the width of the finger slot and the width of the elastic contact piece, and the strip-shaped plate advances by one conveying step distance on the conveying path every time, the forming die performs a die closing action, one finger slot is punched out by the finger slot punching die core unit in the same die closing action, and at least two recess forming positions of the strip-shaped plate are sequentially spaced in the conveying direction by one step distance and are sequentially spaced by the groove bottom recess compression die core unit, wherein one recess forming position corresponds to the groove bottom of the punched finger slot in the die closing action.

[0008] Beneficial Effects: This invention proposes a novel processing method for finger grooves and groove bottom recesses. The strip plate is conveyed in a step-by-step manner on a dedicated forming mold. Each time the strip plate advances one conveying step, the forming mold closes, punching a finger groove into the strip plate and pressing at least two recess forming positions spaced one step apart in the conveying direction. During pressing, the groove bottom recess forming mold core unit extrudes a new groove bottom recess at the foremost recess forming position on the strip plate. Simultaneously, at the adjacent subsequent recess forming position, the already formed groove bottom recess is supported, positioned, and shaped. This prevents deformation of the already formed groove bottom recess, thus ensuring the relative position of the groove bottom recess and the elastic contact piece, guaranteeing processing accuracy.

[0009] Furthermore, during the same mold closing action, the groove bottom recess forming die core unit is used to press the three recess forming positions of the strip plate. The middle recess forming position of the three recess forming positions corresponds to the bottom of the finger groove punched out during the mold closing action.

[0010] Beneficial effects: During a single mold closing action, the groove bottom recess forming die core unit presses three recess forming positions on the strip plate, and the middle recess forming position corresponds to the bottom of the finger groove punched out during the mold closing action. In this way, with each mold closing, the forming die extrudes a new groove bottom recess on the strip plate and corrects the shape of the first two groove bottom recesses that have been formed. The groove bottom recess forming die core unit can simultaneously correct the two groove bottom recesses on the left and right sides of the same elastic contact piece, thereby further ensuring the relative position of the elastic contact piece and the groove bottom recess and improving the processing accuracy.

[0011] Furthermore, during the same mold closing action, the groove bottom recess forming mold core unit presses the three recess forming positions of the strip plate, while the finger groove punching mold core unit punches grooves into the strip plate.

[0012] Beneficial effect: By allowing the forming and grooving to be carried out simultaneously during a single mold closing action, processing efficiency can be further improved.

[0013] The molding die of this invention adopts the following technical solution:

[0014] The forming die comprises an upper die and a lower die, a feeding channel for feeding the strip-shaped plate from front to back in a step-by-step manner is formed between the upper die and the lower die, the feeding step distance is equal to the sum of the width of the finger slot and the width of the elastic contact piece, the forming die comprises a finger slot punching die core unit and a groove bottom recess pressing die core unit, the finger slot punching die core unit is used for punching a slot on the strip-shaped plate, the groove bottom recess pressing die core unit comprises at least two groups of recess pressing cooperating die cores which are sequentially spaced in the feeding direction at a step distance as a unit, and is used for pressing at least two recess forming positions of the strip-shaped plate which are sequentially spaced in the feeding direction at a step distance as a unit, and one of the recess forming positions corresponds to the groove bottom position of the punched finger slot in the same die closing action.

[0015] Beneficial effects: the forming die is improved on the basis of the existing forming die, the strip-shaped plate is put into the feeding channel between the upper die and the lower die, the strip-shaped plate is fed from front to back in a step-by-step manner, the forming die is closed once every time the strip-shaped plate advances by one feeding step distance, thereby a finger slot is punched on the strip-shaped plate and at least two recess forming positions of the strip-shaped plate which are sequentially spaced in the feeding direction at a step distance as a unit are pressed, when pressing, the groove bottom recess pressing die core unit extrudes a new groove bottom recess at the foremost recess forming position on the strip-shaped plate, and at the same time supports and positions the previously formed groove bottom recess at the adjacent recess forming position and corrects the shape, thereby the deformation of the previously formed groove bottom recess is avoided, and the relative position of the groove bottom recess and the elastic contact piece is ensured, and the machining precision is ensured.

[0016] Further, the groove bottom recess pressing die core unit comprises three groups of recess pressing cooperating die cores, so as to simultaneously press three recess forming positions of the strip-shaped plate, and one of the three recess forming positions which is in the middle corresponds to the groove bottom of the punched finger slot in the die closing action.

[0017] Beneficial effects: one new groove bottom recess is extruded on the strip-shaped plate and the previously formed two groove bottom recesses are corrected every time the forming die is closed, the groove bottom recess pressing die core unit can simultaneously correct two groove bottom recesses on the left and right sides of the same elastic contact piece, thereby the relative position of the elastic contact piece and the groove bottom recess is further ensured, and the machining precision is improved.

[0018] Further, the forming die comprises an upper pressing die core and a lower pressing die core, the upper pressing die core comprises a pressing plane for pressing the upper plate surface of the strip-shaped plate and a cutter for punching the finger slot, the lower pressing die core comprises a material supporting plane for supporting the strip-shaped plate and a material cutting groove corresponding to the cutter, the material supporting plane is provided with a forming protrusion for cooperating with the pressing plane to form the groove bottom recess, the forming protrusion and the pressing plane jointly constitute the groove bottom recess pressing die core unit, and the cutter and the material cutting groove jointly constitute the finger slot punching die core unit.

[0019] Beneficial effects: the strip-shaped plate is placed on the material supporting plane of the lower pressing mold core during processing, which can fix the position of the lower pressing mold core, and the mold closing or separation can be realized by controlling the up-down action of the upper pressing mold core, the mold closing action is more stable and reliable, the gravity of the upper pressing mold core itself can also be used as part of the extrusion force to act on the strip-shaped plate, the pressing is more reliable, and the extrusion forming effect of the groove bottom recess is better.

[0020] Further, the upper pressing mold core comprises a pressure bearing core column, the lower end of the pressure bearing core column is provided with the cutter, the pressure bearing outer sleeve is movably sleeved outside the pressure bearing core column, the lower end of the pressure bearing outer sleeve is provided with an upper pressing plate, the lower side of the upper pressing plate forms the pressing plane, the upper pressing plate is provided with an avoiding channel avoiding the cutter, and a compression spring is assembled between the pressure bearing outer sleeve and the pressure bearing core column.

[0021] Beneficial effects: when the pressure bearing core column is pressed from above, the pressure greater than the action force of the compression spring promotes the downward movement of the pressure bearing core column, and when the pressure above is removed, the pressure bearing core column can automatically move upward and reset under the action force of the compression spring, so that the up-down action process of the pressure bearing core column is relatively stable and the control is more convenient. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a self-force type contact finger in the prior art;

[0023] Figure 2 It is a structural schematic diagram of embodiment 1 of the forming mold of the application;

[0024] Figure 3 It is a structural schematic diagram of the upper die in embodiment 1 of the forming mold of the application;

[0025] Figure 4 It is a front view of the lower die in embodiment 1 of the forming mold of the application;

[0026] Figure 5 It is a top view of the lower die in embodiment 1 of the forming mold of the application;

[0027] In the figure: 1, contact finger piece; 101, arc-shaped base body; 102, elastic contact piece; 103, contact finger groove; 104, groove bottom recess; 105, electrical contact section; 2, upper die; 201, striking head; 202, compression spring; 203, punch lifting bolt; 204, die guide rod; 205, pressure bearing outer sleeve; 206, punch; 207, cutter; 208, upper pressing plate; 3, lower die; 301, first forming protrusion; 302, second forming protrusion; 303, third forming protrusion; 304, cutting groove. DETAILED DESCRIPTION

[0028] The present application provides a processing method for a contact finger slot and a slot bottom recess, and a forming die specially used for processing the contact finger slot and the slot bottom recess. The forming die can complete the processing of the contact finger slot and the slot bottom recess in one process. The forming die is provided with two or more slot bottom recess pressing die core units. The slot bottom recess pressing die core units are synchronously operated. A newly formed slot bottom recess can support and position a previously formed slot bottom recess, thereby avoiding deformation of the previously formed slot bottom recess and improving the processing precision.

[0029] The features and performance of the present application are further described in detail below in combination with embodiments.

[0030] Embodiment 1 of the processing method for the contact finger slot and the slot bottom recess of the present application:

[0031] The strip-shaped plate is stepwise conveyed from front to back. The conveying step distance is equal to the sum of the width of the contact finger slot and the width of the elastic contact piece. The strip-shaped plate advances by one conveying step distance on the conveying path. The forming die performs one clamping action. In the same clamping action, one contact finger slot is punched out by the contact finger slot punching die core unit. Three recess forming positions on the strip-shaped plate are pressed by the slot bottom recess pressing die core unit. The three recess forming positions are spaced by one step distance in the conveying direction. The recess forming position in the middle of the three recess forming positions corresponds to the slot bottom of the contact finger slot punched out in the clamping action. In the same clamping action, the three recess forming positions on the strip-shaped plate are pressed by the slot bottom recess pressing die core unit, and the strip-shaped plate is punched by the contact finger slot punching die core unit. The pressing and punching of the strip-shaped plate are synchronously performed, which can further improve the processing efficiency.

[0032] In the clamping action, when the three recess forming positions on the strip-shaped plate are pressed by the slot bottom recess pressing die core unit, a new slot bottom recess is extruded at the recess forming position at the front end of the strip-shaped plate. The previously formed slot bottom recess is supported and positioned at the recess forming position at the middle position, and the previously formed slot bottom recess is supported and positioned at the recess forming position at the rear end. That is, the slot bottom recess pressing die core unit can simultaneously position and shape two slot bottom recesses on the left and right sides of the elastic contact piece, thereby further ensuring the relative position of the elastic contact piece and the slot bottom recess and improving the processing precision.

[0033] The forming die of the present application is described in detail below in combination with the drawings:

[0034] Embodiment 1 of the forming die of the present application is shown in Figure 2As shown, the forming die comprises an upper die 2 and a lower die 3, and has a feeding channel between the upper die 2 and the lower die 3 for feeding the strip-shaped plate from front to back in a step-by-step manner, and the feeding step distance is equal to the sum of the width of the finger groove 103 and the width of the elastic contact piece 102. The structure of the upper die 2 is as shown in Figure 3 As shown, the upper pressing die core comprises a punch guide rod 204, the lower part of the punch guide rod 204 is hoisted with a punch 206 through a punch hoisting bolt 203, the punch guide rod 204 is externally sleeved with a pressure bearing sleeve 205, the upper end of the punch guide rod 204 penetrates out of the pressure bearing sleeve 205 upwards, and the lower part of the punch guide rod 204 has an annular outer flange, which forms a stop cooperation with the pressure bearing sleeve 205 to prevent the punch guide rod 204 from slipping out of the pressure bearing sleeve 205. The punch guide rod 204 is provided with a through hole penetrating through the punch guide rod 204 upwards and downwards, the through hole is a stepped hole comprising a large-diameter section at the upper part and a small-diameter section at the lower part, the small-diameter section is provided with an internal thread, the punch hoisting bolt 203 is installed in the through hole, and the lower part of the punch 206 bolt is screwed into the threaded hole on the punch 206 to hoist and fix the punch 206 below the punch guide rod 204. The lower part of the punch 206 has a cutter 207 extending radially, and the size of the cutter 207 is matched with the size of the finger groove 103. The lower end of the pressure bearing sleeve 205 is installed with an upper pressing plate 208, the lower side of the upper pressing plate 208 constitutes a pressing plane for pressing the strip-shaped plate, the upper pressing plate 208 is a circular plate, and the upper pressing plate 208 is provided with an avoiding channel avoiding the cutter 207. The punch guide rod 204 is provided with a striking head 201 above, the striking head 201 is provided with a screw hole, the screw penetrates through the striking head 201 and is screwed into the threaded hole in the upper part of the punch guide rod 204 to realize the fixed connection of the striking head 201 and the pressure bearing sleeve 205. The striking head 201, the punch guide rod 204 and the punch 206 jointly constitute a pressure bearing core column.

[0035] The punch guide rod 204 is externally sleeved with a compression spring 202, the two ends of the compression spring 202 are respectively pressed on the striking head 201 and the pressure bearing sleeve 205, and under the elastic force of the compression spring 202, the pressure bearing core column is at the upper limit position of the pressure bearing sleeve 205 and the cutter 207 is retracted into the avoiding channel. The striking head 201 is provided with a press above, when the press presses the striking head 201 downwards, the striking head 201 drives the punch guide rod 204 and the punch 206 to move downwards together, the compression spring 202 is compressed, and the cutter 207 extends downwards through the hole on the upper pressing plate 208; when the press is retracted, the striking head 201, the punch guide rod 204 and the punch 206 move upwards together to reset under the action of the compression spring 202.

[0036] The structure of the lower die 3 is as shown in Figure 4 , Figure 5As shown, the lower mold 3 comprises a lower compression mold core, which comprises a circular base body, the upper surface of the circular base body forms a material supporting plane for supporting the strip-shaped plate, a cutting groove 304 is arranged on the circular base body at a middle position for inserting the cutting knife 207, and the cutting groove 304 and the cutting knife 207 jointly constitute a finger groove punching mold core unit for punching grooves on the strip-shaped plate. The cutting groove 304 extends along the radial direction of the circular base body, the diameters of the portions of the cutting groove 304 are equal, the size of the cutting groove 304 is matched with the size of the cutting knife 207, a waste passage is communicated with the cutting groove 304 on the circular base body, the waste passage has a structure of being thin at the top and thick at the bottom, and a waste groove is communicated with the lower part of the waste passage, and the waste punched out is dropped into the waste groove below for recycling. Three forming protrusions are arranged on the material supporting plane in sequence and at intervals along the feeding direction, the three forming protrusions cooperate with the pressing plane of the upper compression mold core to form the groove bottom recess 104, the interval between the adjacent two forming protrusions is one conveying step, the first forming protrusion 301 is located at the front end, the second forming protrusion 302 is located at the groove bottom position of the cutting groove 304, and the third forming protrusion 303 is located at the rear end. Each forming protrusion and the corresponding part of the pressing plane constitute a set of recess compression mold core, and the three forming protrusions and the pressing plane jointly constitute a groove bottom recess compression mold core unit.

[0037] During forming, the strip-shaped plate is placed on the material supporting plane of the lower mold 3, the strip-shaped plate is conveyed in steps from front to back by NC program control, when the upper mold 2 needs to be moved downward to the lower mold 3, the press lower striking head 201 is pressed, the upper pressing plate 208 contacts and presses the strip-shaped plate, the upper pressing plate 208 cooperates with the forming protrusions on the lower mold 3 to extrude a groove bottom recess 104 on the corresponding position of the strip-shaped plate, at the same time, the compression spring 202 is compressed under force, the punch 206 moves downward, the cutting knife 207 extends downward from the upper pressing plate 208 and punches a finger groove 103 on the strip-shaped plate; when the press is retracted, the cutting knife 207 is retracted, the upper mold 2 is automatically reset under the action of the compression spring, the strip-shaped plate is advanced by one conveying step, the next finger groove 103 is started to be processed, and the formed groove bottom recess 104 is shaped. The strip-shaped plate is conveyed in steps until the processing of all finger grooves 103 and groove bottom recesses 104 is completed.

[0038] With each forward movement of the strip-shaped plate by one conveying step, the forming die is closed once, so as to punch out one finger slot 103 on the strip-shaped plate and to perform the profiling on three recess forming positions of the strip-shaped plate. When the profiling is performed, the profiling cooperating die core located at the foremost end of the one set of recesses is extruded from the recess forming position at the foremost end of the strip-shaped plate to form a new groove bottom recess 104, and meanwhile, the second and third forming protrusions are supported in the two previously formed groove bottom recesses 104 to support, position and shape the two previously formed groove bottom recesses 104, so that when the new groove bottom recess 104 is extruded, the metal structure of the extruded part on the strip-shaped plate can be effectively prevented from being displaced greatly to cause the deformation of the previously formed groove bottom recess 104, and meanwhile, the shaped groove bottom recess 104 can be shaped, so as to ensure the size and depth of the groove bottom recess 104, and further ensure the relative position between the groove bottom recess 104 and the elastic contact piece 102, and ensure the high machining precision.

[0039] After all the finger slots 103 and groove bottom recesses 104 are machined on the strip-shaped plate, the strip-shaped plate is cut and deburred according to the set length, which is equal to the flattened length of the finger piece 1; after the cutting, the upper part of each elastic contact piece 102 of the strip-shaped plate is bent to form an electrical contact section 105 on a common punch, or the electrical contact section 105 can be machined by the V-shaped head forming die in the prior art cited in the background technology; finally, the strip-shaped plate is bent into an arc shape by using a bending forming tool, and the bending forming tool can adopt the bending profiling die in the prior art cited in the background technology.

[0040] Embodiment 2 of the method for machining the finger slot and the groove bottom recess: the main difference from the embodiment 1 of the method for machining the finger slot and the groove bottom recess is that, in the same closing action, the groove bottom recess profiling die core unit is used to profile two recess forming positions on the strip-shaped plate which are spaced apart by one step in the conveying direction in sequence, and one of the recess forming positions corresponds to the groove bottom of the finger slot punched out in the closing action. Of course, in other embodiments, the groove bottom recess profiling die core unit can also be used to profile more than four recess forming positions on the strip-shaped plate which are spaced apart by one step in the conveying direction in sequence in the same closing action, so that one of the recess forming positions corresponds to the groove bottom of the finger slot punched out in the closing action.

[0041] Embodiment 3 of the method for machining the finger slot and the groove bottom recess: the main difference from the embodiment 1 of the method for machining the finger slot and the groove bottom recess is that, in the same closing action, the groove bottom recess profiling die core unit is used to profile three recess forming positions on the strip-shaped plate, and one of the recess forming positions at the last end corresponds to the groove bottom of the finger slot punched out in the closing action.

[0042] Embodiment 4 of the method for processing the finger slot and the groove bottom recess of the application: the main difference between this embodiment and Embodiment 1 of the method for processing the finger slot and the groove bottom recess of the application is that, in the same mold closing action, the three recess forming positions of the strip-shaped plate are first formed by the groove bottom recess compression mold core unit, and then the strip-shaped plate is punched by the finger slot punching mold core unit. In other embodiments, the strip-shaped plate can also be punched by the finger slot punching mold core unit first, and then the three recess forming positions of the strip-shaped plate are formed by the groove bottom recess compression mold core unit in the same mold closing action.

[0043] Embodiment 2 of the molding mold of the application: the main difference between this embodiment and Embodiment 1 of the molding mold of the application is that two forming protrusions are arranged on the material supporting plane of the lower mold along the feeding direction at intervals, the interval between the two forming protrusions is one conveying step, the last forming protrusion corresponds to the cutting groove position of the lower mold, and each forming protrusion and the corresponding part of the pressure applying plane of the upper mold form a set of recess compression mold core. At this time, the groove bottom recess compression mold core unit can form two recess forming positions of the strip-shaped plate at intervals in the conveying direction with one step as the interval unit, and when compression molding, the previous set of recess compression mold cores extrude a new groove bottom recess at the corresponding position on the strip-shaped plate, and the next set of recess compression mold cores support, position and shape the previously formed groove bottom recess.

[0044] Of course, in other embodiments, more than four forming protrusions can also be arranged on the material supporting plane of the lower mold along the feeding direction at intervals, the interval between the two adjacent forming protrusions is one conveying step, one of the forming protrusions corresponds to the cutting groove position of the lower mold, and each forming protrusion and the corresponding part of the pressure applying plane of the upper mold form a set of recess compression mold cores. At this time, the groove bottom recess compression mold core unit can form more than four recess forming positions of the strip-shaped plate at intervals in the conveying direction with one step as the interval unit, and when compression molding, the first set of recess compression mold cores extrude a new groove bottom recess at the corresponding position on the strip-shaped plate, and the remaining sets of recess compression mold cores support, position and shape the previously formed groove bottom recess.

[0045] Embodiment 3 of the molding mold of the application: the main difference between this embodiment and Embodiment 1 of the molding mold of the application is that three forming protrusions are arranged on the material supporting plane of the lower mold along the feeding direction at intervals, the interval between the two adjacent forming protrusions is one conveying step, and the last forming protrusion corresponds to the cutting groove position of the lower mold. Of course, in other embodiments, the first forming protrusion can also correspond to the cutting groove position of the lower mold.

[0046] Embodiment 4 of the molding mold of the application: the main difference between this embodiment and Embodiment 1 of the molding mold of the application is that the forming protrusion is arranged on the lower side surface of the upper mold.

[0047] The above merely describes preferred embodiments of the present application and is not used to limit the present application, and the patent protection scope of the present application is subject to the claims, and any equivalent structural changes made according to the content of the specification and drawings of the present application should also be included in the protection scope of the present application.

Claims

1. A method for processing a finger groove and a groove bottom recess, characterized in that: The strip plate is conveyed from front to back in a step-by-step manner. The conveying step distance is equal to the sum of the width of the finger groove and the width of the elastic contact piece. For each conveying step distance that the strip plate advances along the conveying path, the forming mold performs a mold closing action. During the same mold closing action, a finger groove is punched out by the finger groove punching die core unit. The groove bottom recess forming die core unit presses three recess forming positions of the strip plate at intervals of one step distance in the conveying direction. The middle recess forming position corresponds to the bottom of the finger groove punched out during the mold closing action. The groove bottom recess formed by the groove bottom recess forming die core unit is connected to the finger groove. The finger groove punching die core unit punches from the side away from the groove bottom recess.

2. A forming mold, comprising an upper mold (2) and a lower mold (3), wherein the upper mold (2) and the lower mold (3) have a feeding channel for the step-by-step conveying of a strip plate from front to back, the conveying step distance being equal to the sum of the width of the finger groove (103) and the width of the elastic contact piece (102), characterized in that: The forming mold includes a finger groove punching die core unit and a groove bottom recess forming die core unit. The finger groove punching die core unit is used to punch grooves in the strip plate. The groove bottom recess forming die core unit includes three recess forming matching die cores that are spaced apart in the conveying direction at one-step intervals. These die cores are used to form three recess forming positions of the strip plate that are spaced apart in the conveying direction at one-step intervals. In the same mold closing action, the middle recess forming position corresponds to the groove bottom position of the finger groove (103) punched out in the mold closing action. The groove bottom recess formed by the groove bottom recess forming die core unit is connected to the finger groove. The finger groove punching die core unit punches from the side away from the groove bottom recess.

3. The molding die according to claim 2, characterized in that: The forming mold includes an upper pressing mold core and a lower pressing mold core. The upper pressing mold core includes a pressing plane for pressing the upper surface of the strip plate and a cutter (207) for punching the finger groove (103). The lower pressing mold core includes a material support plane for supporting the strip plate and a cutting groove (304) corresponding to the cutter (207) above and below. The material support plane is provided with a forming protrusion for cooperating with the pressing plane to form the groove bottom recess (104). The forming protrusion and the pressing plane together constitute the groove bottom recess pressing mold core unit. The cutter (207) and the cutting groove (304) together constitute the finger groove punching mold core unit.

4. The molding die according to claim 3, characterized in that: The upper pressure mold core includes a pressure-bearing core column, the lower end of which is provided with the cutter (207), and a pressure-bearing outer sleeve (205) is movably sleeved on the pressure-bearing core column. An upper pressure plate (208) is installed at the lower end of the pressure-bearing outer sleeve (205). The lower side of the upper pressure plate (208) forms the pressure-applying plane. The upper pressure plate (208) is provided with a clearance channel to avoid the cutter (207). A compression spring (202) is assembled between the pressure-bearing outer sleeve (205) and the pressure-bearing core column. Under the elastic force of the compression spring (202), the pressure-bearing core column is at the upper limit position relative to the pressure-bearing outer sleeve (205), and the cutter (207) is retracted to avoid the clearance channel.

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