A method for combined punching and extrusion forming of a terminal

Abstract

A kind of punch extrusion composite forming method of terminal, comprising: step one, punch offal to round bar stock, and carry out bending;Step two, to the bending piece is flattened, and the reserved cylinder head at one end of round bar stock is as the terminal post, the step between cylinder head and flattened part is formed during flattening;Step three, the flattened part of step two is punched, once the hole round cake on terminal and the straight handle on its side are formed, and the included angle formed by the straight handle and the reserved cylinder head is equal to the bending degree of bar stock in step one;Step four, the straight handle on the workpiece obtained in step three is bent, to obtain the part forging;Step five, the reserved cylinder head part in part forging is processed to obtain the terminal post of part, and the terminal product is obtained after processing the outer circle of terminal post.The terminal formed by the method is of integrated structure, and has good overall mechanical properties, which can meet the sealing requirements of terminal post.

Description

Technical Field

[0001] This invention belongs to the field of metal cold forging, and specifically relates to a punching and extrusion composite forming method for terminal blocks. Background Technology

[0002] The terminal structure formed by the present invention is as follows Figure 1 As shown, the terminal includes a perforated disc portion 1 for circumferential positioning, a straight shank portion 2 for circumferential positioning, a connecting step portion 3, and a terminal block portion 4. The blind hole 5 of the terminal block portion 4 is connected to the conductive copper wire. To avoid oxidation affecting conductivity, it needs to be used under sealed conditions.

[0003] The connection terminal can be formed using the following two methods in the prior art.

[0004] Method 1: The copper plate and the terminal block are processed separately. The copper plate is punched to make the shape of the perforated disc part and the straight shank part, and the inner hole of the perforated disc part is punched. Then the perforated disc part and the cylindrical part are welded together, and the straight shank part is bent. The outer contour of the terminal block part is machined, and the connecting step part is machined on the terminal block part.

[0005] The disadvantages of method one are: welding is used between the connecting step part and the perforated disc part, which poses a risk of desoldering; the terminal part and the connecting step part need to be machined as a whole, and the strength of the terminal part is insufficient.

[0006] Method 2: The sheet metal is stamped and bent into shape, with the terminal block portion formed by rolling the sheet metal into a circle. The terminal block obtained by this method is... Figure 1 The structures shown are not exactly the same; the terminal part is a through hole, and there is no connecting step between the terminal part and the perforated disc part.

[0007] The disadvantages of method two are: the terminal part is a through hole, which cannot play a sealing role, and air can enter into the hole, causing oxidation to the connected wires; there is no connecting step part, the overall connection strength is not good, and the insufficient cross-sectional area of ​​the connection surface will lead to a decrease in conductivity and easily cause the connection part to overheat. Summary of the Invention

[0008] The purpose of this invention is to provide a punching and extrusion composite forming method for terminal blocks. The terminal blocks formed by this method have an integral structure, eliminating the need for welding stepped structures, resulting in good overall mechanical properties. The terminal block portion is a blind hole, which facilitates sealing and meets the sealing requirements of the terminal block.

[0009] To achieve the above objectives, the technical solution adopted by the present invention is: a punching and extrusion composite forming method for terminal blocks, comprising the following steps:

[0010] Step 1: Punch and cut the round bar material, and then bend it.

[0011] Step 2: Flatten the bent part and use the reserved cylindrical head at one end of the round bar as the terminal post. During the flattening process, a step is formed between the cylindrical head and the flattened part.

[0012] Step 3: Perform compound punching on the flattened part of Step 2 to form a perforated round disc on the terminal block and a straight shank on one side of the perforated round disc in one step. The angle formed by the straight shank and the reserved cylindrical head is equal to the bending angle of the bar stock in Step 1.

[0013] Step four: Bend the straight shank on the workpiece obtained in step three to obtain the forging part;

[0014] Step 5: Machining the reserved cylindrical head portion in the forging part to obtain the terminal block of the part, and machining the outer circle of the terminal block to obtain the finished part.

[0015] In step one, the selected round bar material is T2 copper in Y2 state with a roughness of Ra1.6 or less.

[0016] In step two, the thickness of the flattened blank is 1±0.1mm.

[0017] In step two, the bending part is flattened using a flattening mold. The upper flattening mold of the flattening mold is provided with a stepped cavity. While the bending part is being flattened, the step is formed in the stepped cavity.

[0018] The flattening upper die is fixedly installed inside the flattening upper template, and the lower part of the flattening upper die protrudes from the flattening upper die fixing plate. An upper floating block is also floatingly installed inside the flattening upper die fixing plate. A lower floating block corresponding to the upper floating block is installed in the lower die assembly of the flattening die. The upper floating block and the lower floating block are used to clamp the cylindrical head at the end of the bent part.

[0019] In step three, a compound punching die is used to perform compound punching on the flattened part of the part.

[0020] The composite punching die includes an upper die assembly and a lower die assembly. The upper die assembly is fixedly provided with a downwardly extending composite punching upper punch and a composite punching upper die. A stripper block that can move up and down is provided in the die hole of the composite punching upper die. The stripper block has a through hole for the composite punching upper punch to pass through. The lower die assembly has a lower punch and die located directly below the stripper block. The lower punch and die has a die hole to accommodate the composite punching upper punch. During the mold closing process of the upper die assembly and the lower die assembly, a cavity to accommodate the reserved cylindrical head can be formed between the lower punch and die and the stripper block. The lower die assembly is provided with a groove to accommodate punching waste.

[0021] The upper die assembly is provided with a composite punch fixing plate located above the composite punching upper die. The upper part of the composite punching upper die is fixed inside the composite punching upper die fixing plate. A movable cavity is formed between the composite punching upper die fixing plate and the composite punching upper die. An annular stripper plate is provided inside the movable cavity and is fitted onto the composite punching upper die. The top surface of the annular stripper plate abuts against the lower end of the ejector rod that penetrates the composite punching upper die fixing plate and the composite punching upper die plate. The upper end of the ejector rod abuts against the punching upper die ejector plate that is floatingly disposed inside the punch press die shank.

[0022] Two positioning posts are spaced apart on the lower die, and the distance between the two positioning posts is equivalent to the diameter of the reserved cylindrical head in step two.

[0023] In step four, the bending angle of the straight handle is 90°±1°.

[0024] The beneficial effects of the present invention are as follows: The present invention adopts a cold forging forming process, and the terminal part, the perforated disc part, the connecting step part and the straight shank part of the part are integral structures, which do not require welding and do not pose a risk of desoldering, resulting in high overall strength; Since the terminal part is machined from one end of the bar stock, this part is a blind hole, which facilitates sealing and prevents the wires after connection from being oxidized. Attached Figure Description

[0025] Figure 1 A schematic diagram of the structure of the terminal block manufactured according to the present invention;

[0026] Figure 2 This is a process flow diagram of the method described in this invention;

[0027] Figure 3 This is a schematic diagram of the punching and blanking die.

[0028] Figure 4 A schematic diagram of the flattening mold;

[0029] Figure 5 This is a schematic diagram of the structure of a composite punching die;

[0030] The markings in the diagram are: 1. Perforated disc section; 2. Straight shank section; 3. Connecting step section; 4. Terminal post section; 5. Blind hole; 6. Round bar stock; 7. Bending part.

[0031] 1000. Punching and blanking die; 1001. Punch press die handle one; 1002. Punching and blanking upper die plate; 1003. Punching and blanking upper die pad; 1004. Rectangular spring one; 1005. Punching and blanking upper die fixing plate; 1006. Punching and blanking upper die; 1007. Pressure slider; 1008. Punching positioning block; 1009. Punching and blanking lower die; 1010. Sliding guide block; 1011. Punching and blanking lower die fixing plate; 1012. Rectangular spring two; 1013. Punching and blanking lower die pad; 1014. Punching and blanking lower die plate;

[0032] 2000. Flatten the mold; 2001. Flatten the upper template; 2002. Rectangular rubber block one; 2003. Flatten the upper mold pad; 2004. Flatten the upper mold; 2005. Flatten the upper mold fixing plate; 2006. Flatten the lower mold; 2007. Flatten the lower mold fixing plate; 2008. Flatten the lower mold pad; 2009. Flatten the inner guide post; 2010. Upper floating block; 2011. Flatten the positioning block; 2012. Flatten the guide sleeve; 2013. Hexagonal screw; 2014. Lower floating block; 2015. Rectangular rubber block two; 2016. Flatten the lower template.

[0033] 3000. Composite punching die; 3001. Composite punching upper template; 3002. Composite punching upper punch; 3003. Composite punching punch fixing plate; 3004. Annular stripper plate; 3005. Stripper block; 3006. Composite punching upper die; 3007. Lower punch stripper plate; 3008. Lower punch and die; 3009. Polyurethane rubber ring; 3010. Lower punch and die fixing sleeve; 3011. Composite punching lower punch pad; 3012. Composite punching lower template; 3013. Ejector pin; 3014. Punching upper die ejector plate; 3015. Punch press die handle two; 3016. Ejector rod; 3017. Positioning pin. Detailed Implementation

[0034] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the invention in any way.

[0035] The structure of the wiring terminal required by this invention is as follows: Figure 1 As shown, the terminal includes a perforated disc portion 1, a straight shank portion 2, a connecting step portion 3, and a terminal block portion 4. The blind hole 5 of the terminal block portion 4 is connected to the conductive copper wire. To prevent oxidation from affecting conductivity, the blind hole of the terminal block needs to be sealed. Figure 1 The included angle between the middle terminal portion 4 and the straight handle portion 2 is 120°.

[0036] The punching and extrusion composite forming method used in this invention includes, as follows: Figure 2 Steps (1) to (6) shown:

[0037] (1) Select T2 copper round bar material, with an outer diameter of φ7mm, Y2 state, no cracks or inclusions on the outer circle, and a roughness of Ra1.6 or less;

[0038] (2) Punching and blanking: Punching and blanking the selected round bar material and bending it, with the included angle after bending being 120°;

[0039] (3) Flattening: Flatten the bent parts after punching and bending. The thickness of the blank after flattening is 1±0.1mm. When flattening, retain the cylindrical head at one end of the round bar as the terminal post. During the flattening process, the step part between the cylindrical head and the flattened part is formed at the same time.

[0040] (4) Composite punching: The flattened part in step two is composite punched to form a perforated round cake on the terminal block and a straight shank on one side of the perforated round cake. The angle formed by the straight shank and the reserved cylindrical head is equal to the bending angle of the bar in step two.

[0041] (5) Bending: The straight shank on the workpiece obtained in step four is bent at an angle of 90°±1° to obtain the forging part;

[0042] (6) The reserved cylindrical head part in the forging part is machined to obtain the terminal of the part, and the outer circle of the terminal is machined to obtain the finished part.

[0043] In step two, the punching and bending of the round bar is carried out in steps using conventional methods. First, a certain length of round bar is punched according to the part size, and then the round bar is bent; or the end of the bar is bent according to the part size, and then the bent part is cut off from the whole bar.

[0044] Preferably, a punching and blanking die 1000 can be used to complete the punching, blanking, and bending of the round bar material in one operation. The specific structure of the punching and blanking die 1000 is as follows: [Combined with...] Figure 3 As shown, it includes an upper die assembly and a lower die assembly; wherein, the upper die assembly consists of: a punching die shank 1001, a punching blanking upper template 1002, a punching blanking upper die pad 1003, a rectangular spring 1004, a punching blanking upper die fixing plate 1005, a punching blanking upper die 1006, and a pressure slider 1007; the lower die assembly consists of: a punching positioning block 1008, a punching blanking lower die 1009, a sliding guide block 1010, a punching blanking lower die fixing plate 1011, a rectangular spring 2 1012, a punching blanking lower die pad 1013, and a punching blanking lower template 1014.

[0045] The assembly sequence of the upper mold components is as follows:

[0046] (1) The upper die 1006 and the pressure slide 1007 are installed together in the upper die fixing plate 1005. The upper die 1006 and the upper die fixing plate 1005 are in transition fit, and the pressure slide 1007 and the upper die fixing plate 1005 are in clearance fit. The upper die 1006 and the pressure slide 1007 are fixed on the upper die fixing plate 1005 by the bottom step.

[0047] (2) Insert the rectangular spring 1004 into the punching and blanking upper die pad 1003;

[0048] (3) Assemble the upper die plate 1002, the upper die pad 1003, and the upper die fixing plate 1005 from top to bottom and tighten them with bolts. At this time, the upper end of the pressure slider 1007 is pressed against the bottom of the rectangular spring 1004.

[0049] (4) Tighten the punch die shank 1001 to the punching blank upper die plate 1002 with bolts.

[0050] In the upper die assembly, the bottom of the punching and blanking upper die 1006 has a concave arc-shaped surface, the shape of which matches the outer circular surface of the bent part 7.

[0051] The assembly sequence of the lower mold assembly is as follows:

[0052] (1) The punching blanking die 1009 and the punching blanking die fixing plate 1011 are interference-fitted together;

[0053] (2) The sliding guide block 1010 is installed into the punching blanking die fixing plate 1011, and the sliding guide block 1010 and the punching blanking die fixing plate 1011 are in a clearance fit state.

[0054] (3) Insert the rectangular spring 1012 into the punching die pad 1013;

[0055] (4) Assemble the punching blanking die fixing plate 1011, the punching blanking die pad 1013, and the punching blanking die template 1014 from top to bottom and tighten them with bolts. At this time, the rectangular spring 1012 is located directly below the sliding guide block 1010, and the bottom of the sliding guide block 1010 is pressed against the rectangular spring 1012.

[0056] (5) The punching positioning block 1008 is fitted into the punching blanking die fixing plate 1011 with transition fit. The positioning surface of the punching positioning block 1008 is higher than the upper surface of the punching blanking die 1009, which is used to limit the insertion length of the round bar material 6.

[0057] In the lower die assembly, the punching and blanking lower die 1009 has a groove for bending and deforming round bar stock. The groove has an outwardly convex arc-shaped surface, the shape of which matches the inner circular surface of the bent part 7.

[0058] In the lower die assembly, the sliding guide block 1010 has a through hole on its side. When the sliding guide block 1010 is not under downward pressure, the lower edge of the through hole is flush with the upper surface of the punching and blanking lower die 1009. The round bar 6 to be punched and blanked is inserted through the through hole until the end of the round bar 6 hits the positioning surface of the punching positioning block 1008. The round bar 6 is supported on the through hole and the upper surface of the punching and blanking lower die 1009.

[0059] The sequence of actions in the punching and blanking process is as follows:

[0060] After the upper and lower die assemblies are aligned using the standard guide posts and guide sleeves on the upper punching die plate 1002 and the lower punching die plate 1014, concentricity is ensured. The upper die assembly is reliably connected to the press slide via the press die shank 1001. The lower die assembly is bolted to the press work platform. The press moving beam rises, causing the upper die assembly to move. When it moves a certain distance away from the lower die assembly, the round bar 6 is placed into the sliding guide block 1010 of the lower die assembly, and the feeding length is fixed by the punching positioning block 1008. The press moving beam drives the upper die assembly to press downwards, and the pressing slide 1007 first contacts the round bar. As the upper die assembly continues to press down, the pressure slider 1007 presses the round bar 6 tightly to prevent it from shaking during the punching process. The pressure slider 1007 compresses the rectangular spring 1004 upward, causing the upper punching die 1006 to begin bending the round bar 6. When the upper punching die fixing plate 1005 contacts the sliding guide block 1010, it begins to press down on the sliding guide block 1010. The through hole of the sliding guide block 1010 and the upper surface of the lower punching die 1009 are misaligned, cutting the round bar 6 and severing the connection between the front bent part and the rear whole bar, thus obtaining the bent part 7.

[0061] After the blanking is completed, the movable crossbeam drives the upper die assembly to move upward. After moving a certain distance, the forging on the lower die assembly is blown out by an external air source, completing the punching and blanking process.

[0062] Furthermore, in step three of the above composite forming method, the bending part 7 is flattened using a flattening die 2000. The specific structure of the flattening die 2000 is as follows: Figure 4As shown: It includes an upper mold assembly and a lower mold assembly. The upper mold assembly includes a flattened upper template 2001, a rectangular rubber block 1 2002, a flattened upper mold pad 2003, a flattened upper mold 2004, a flattened upper mold fixing plate 2005, a flattened inner guide post 2009, and an upper floating block 2010. The lower mold assembly includes a flattened lower mold 2006, a flattened lower mold fixing plate 2007, a flattened lower mold pad 2008, a flattened positioning block 2011, a flattened guide sleeve 2012, an internal hexagonal screw 2013, a lower floating block 2014, a rectangular rubber block 2 2015, and a flattened lower template 2016.

[0063] The assembly sequence of the upper mold component in the flattening mold is as follows:

[0064] (1) The flattening upper mold 2004 and the upper floating block 2010 are installed together into the flattening upper mold fixing plate 2005. The flattening upper mold 2004 and the flattening upper mold fixing plate 2005 are in transition fit, and the upper floating block 2010 and the flattening upper mold fixing plate 2005 are in clearance fit. The flattening upper mold 2004 and the upper floating block 2010 are fixed on the flattening upper mold fixing plate 2005 by the bottom step.

[0065] (2) Install the flattening inner guide post 2009 onto the flattening upper mold fixing plate 2005. The flattening inner guide post 2009 and the flattening upper mold fixing plate 2005 are interference fit, and the lower part of the flattening inner guide post 2009 extends out of the flattening upper mold fixing plate 2005.

[0066] (3) Place the rectangular rubber block 2002 into the flattened upper mold pad 2003;

[0067] (4) After assembling the flattened upper template 2001, the flattened upper mold pad 2003 and the flattened upper mold fixing plate 2005 from top to bottom, tighten them with bolts. The rectangular rubber block 2002 is located above the upper floating block 2010, and the top of the upper floating block 2010 abuts against the lower end face of the rectangular rubber block 2002.

[0068] In the upper mold assembly, before the mold is activated, the lower surface of the flattening upper mold 2004 is higher than the lower surface of the upper floating block 2010. This allows the upper floating block 2010 to first contact the workpiece and cooperate with the lower mold assembly to clamp the workpiece during the downward pressing process of the lower mold assembly, and then the flattening upper mold 2004 flattens the workpiece. The flattening upper mold 2004 and the upper floating block 2010 are adjacent to a recessed cavity for forming the connecting step portion 3 between the connecting column portion 4 and the perforated disc portion 1 on the part.

[0069] The assembly sequence of the lower die assembly in the flattening mold 2000 is as follows:

[0070] (1) The flattened positioning block 2011 and the lower floating block 2014 are fixed together with hex screws 2013 to form a positioning floating assembly. The flattened positioning block 2011 is located on the side of the lower floating block 2014, and the flattened positioning block 2011 has a positioning head on its upper part, which is located above the lower floating block 2014.

[0071] (2) The positioning floating component of the flattening positioning block 2011 and the lower floating block 2014 and the flattening lower mold 2006 are installed together into the flattening lower mold fixing plate 2007. The positioning floating component and the flattening lower mold fixing plate 2007 are in clearance fit, and the flattening lower mold 2006 and the flattening lower mold fixing plate 2007 are in transition fit. The positioning floating component and the flattening lower mold 2006 are fixed on the flattening lower mold fixing plate 2007 by the bottom step.

[0072] (3) The flattening guide sleeve 2012 is installed into the flattening lower die fixing plate 2007. The flattening guide sleeve 2012 and the flattening lower die fixing plate 2007 are interference fit.

[0073] (4) After assembling the flattened lower mold fixing plate 2007, the flattened lower mold pad plate 2008 and the flattened lower template 2016 from top to bottom, tighten them with bolts.

[0074] In the lower mold assembly, the lower floating block 2014 is located below the upper floating block 2010, and the lower floating block 2014 is supported on a rectangular rubber block 2015.

[0075] The surface of the flattening die 2006 is provided with a groove for placing the intermediate forging blank for punching, and the groove is adapted to the shape of the blank after it is flattened.

[0076] The sequence of flattening actions using a flattening mold is as follows:

[0077] The upper and lower die assemblies are aligned via the flattening inner guide post 2009 and the flattening guide sleeve 2012 to ensure concentricity. The upper die assembly is reliably connected to the press movable crossbeam plate by bolts, and the lower die assembly is fixed to the press lower template by bolts. When the press movable crossbeam rises, it drives the upper die assembly to move. When it moves a certain distance away from the lower die assembly, the punching blank is placed into the flattening lower die 2006 of the lower die assembly and positioned by the flattening positioning block 2011. The press movable crossbeam drives the upper die assembly to press downward. The upper floating block 2010 of the upper die assembly first contacts the cylindrical head of the blank and, together with the lower floating block 2014, presses the blank. As the upper die assembly presses down, the upper floating block 2010 moves upward, causing the flattening upper die 2004 to start contacting the blank and locally flattening it, while simultaneously completing the forging of the connecting step portion.

[0078] During the pressing down of the upper die assembly, the lower floating block moves down a certain distance. After forging is completed, the movable crossbeam drives the upper die assembly to move upward. After moving a certain distance, the lower floating block 2014 will push the forging out under the action of the rectangular rubber block 2015, completing the flattening process.

[0079] Furthermore, in step four of the above composite molding method, a method such as... Figure 5 The composite punching die 3000 shown performs composite punching on the forging after it has been flattened in step three, and obtains a coplanar perforated disc portion and a straight shank portion in one go.

[0080] The upper die assembly of the composite punching die includes a composite punching upper template 3001, a composite punching upper punch 3002, a composite punching punch fixing plate 3003, an annular stripper plate 3004, a stripper block 3005, a composite punching upper die 3006, a composite punching guide sleeve (this structure is not shown in the cut-out position in the figure), an ejector pin 3013, an upper punching die ejector plate 3014, a punch press die shank 3015, and an ejector rod 3016.

[0081] The assembly sequence of the upper die assembly of the composite punching die is as follows:

[0082] (1) The unloading block 3005 is installed into the compound punching upper die 3006, and the unloading block 3005 and the compound punching upper die 3006 are in clearance fit;

[0083] (2) The composite punching guide sleeve is inserted into the composite punching upper die 3006, and the composite punching guide sleeve and the composite punching upper die 3006 are interference fit;

[0084] (3) Place the annular stripper plate 3004 into the groove on the upper surface of the composite punching die 3006 and place it above the stripper block 3005. The thickness of the annular stripper plate 3004 is less than the depth of the groove.

[0085] (4) The compound punching upper punch 3002 is installed into the compound punching punch fixing plate 3003. The compound punching upper punch 3002 and the compound punching punch fixing plate 3003 are interference fit. The compound punching upper punch 3002 passes downward through the annular stripper plate 3004 and the stripper block 3005.

[0086] (5) Assemble the composite punching upper template 3001, the composite punching punch fixing plate 3003 and the composite punching upper die 3006 from top to bottom, and then tighten them with bolts;

[0087] (6) Place the ejector bar 3016 into the composite punching upper template 3001, and let the ejector bar 3016 pass downward through the composite punching punch fixing plate 3003;

[0088] (7) Place the ejector rod 3013 and the composite punching upper die ejector plate 3014 into the punching die shank 3015, and then lock the punching die shank 3015 and the composite punching upper die plate 3001 with bolts. The composite punching upper die ejector plate 3014 is set in the groove on the lower surface of the punching die shank 3015, and the depth of the groove is greater than the thickness of the composite punching upper die ejector plate 3014. The lower end of the ejector rod 3013 extends into the groove and pushes the composite punching upper die ejector plate 3014 downward. The composite punching upper die ejector plate 3014 then pushes the ejector rod 3016 downward. The ejector rod 3016 pushes the annular unloading plate 3004 downward.

[0089] The lower die assembly of the composite punching die 3000 includes: an inner punching guide post (this structure is not shown in the section in the figure), a lower punch unloading plate 3007, a lower punch and die 3008, a polyurethane rubber ring 3009, a lower punch and die fixing sleeve 3010, a composite punching lower punch pad 3011, a composite punching lower template 3012, and a positioning post 3017.

[0090] The assembly sequence of the lower die assembly of the composite punching die is as follows:

[0091] (1) The inner guide post and the lower punch die 3008 are installed into the lower punch die fixing sleeve 3010. The inner guide post and the lower punch die fixing sleeve 3010 and the lower punch die 3008 and the lower punch die fixing sleeve 3010 are all interference fits. The assembly method is to heat the lower punch die fixing sleeve 3010 to 400°C, and then install the inner guide post and the lower punch die 3008 into the heated lower punch die fixing sleeve 3010 at room temperature. The diameter of the lower punch die 3008 is equivalent to that of the unloading block 3005.

[0092] (2) The polyurethane rubber ring 3009 is fitted onto the upper end of the lower punch and die fixing sleeve 3010, and the polyurethane rubber ring 3009 and the lower punch and die fixing sleeve 3010 are in clearance fit.

[0093] (3) The lower punch unloading plate 3007 is fitted onto the upper end of the lower punch die 3008 and supported on the polyurethane rubber ring 3009;

[0094] (4) The composite punching lower punch pad 3011 is placed into the lower punch die fixing sleeve 3010 and supports the lower punch die 3008. The lower punch die 3008 and the composite punching lower punch pad 3011 are provided with through holes that are vertically connected and aligned. The through holes correspond to the composite punching upper punch 3002 and can accommodate the composite punching upper punch 3002.

[0095] (5) Connect the lower punch and die fixing sleeve 3010 to the composite punching lower template 3012 and fasten them together with bolts. The lower punch unloading plate 3007 is connected to the composite punching lower template 3012 by equal height screws. Under pressure, it can float within a certain range by the restriction of the polyurethane rubber ring 3009 and the equal height screws.

[0096] The upper surface of the upper punch and die 3008 is provided with two spaced positioning posts 3017. When the forging to be punched is placed on the upper punch and die 3008, the cylindrical part of the forging head is restricted between the two positioning posts 3017 to prevent the forging from moving during the punching process.

[0097] The sequence of operations for the composite punching die is as follows:

[0098] (1) After the upper die assembly and the lower die assembly are correctly aligned and connected through the inner guide post of the punching and the composite punching guide sleeve, the concentricity of the upper die assembly and the lower die assembly is ensured. The upper die assembly is reliably connected to the punch press slide through the punch press die shank 2 3015, and the lower die assembly is fixed to the lower die platform of the punch press by bolts and pressure plate.

[0099] (2) Place the flattened forging on the lower die assembly. The cylindrical part of the forging head is located between the two positioning pins 3017. The straight edge of the flattened part is close to the end face of the positioning pin 3017. Then, the punch slide drives the upper die assembly to move downward. When the compound punching upper die 3006 contacts the workpiece, it cooperates with the lower punch stripper plate 3007 to press the workpiece tightly, keeping the workpiece stationary. When the punch slide continues to move downward, the polyurethane rubber ring 3009 is compressed, and the upper punch and die... 3008 protrudes from the lower punch stripper plate 3007 and pushes the stripper block 3005 upward. The compound punch upper punch 3002 enters the through hole of the lower punch and die 3008. At this time, the lower punch and die 3008, the compound punch upper punch 3002 and the compound punch upper die 3006 undergo relative displacement to shear the workpiece until the excess external and internal materials are cut off from the workpiece body, resulting in the perforated disc part and the straight shank part on the part. Then the punch press slide returns.

[0100] (3) The return stroke of the punch press slide rises and drives the upper die assembly to move. When it reaches a certain position, the ejector rod 3013 of the upper die assembly will hit the movable crossbeam on the punch press slide and continue to move upward. After the movable crossbeam of the punch press hits the frame limit block, it stops and continues to move upward. The force transmission is as follows: movable crossbeam of punch press slide → ejector rod 3013 → punching upper die ejector plate 3014 → ejector rod 3016 → annular stripper plate 3004 → stripper block 3005. Finally, the punched part is ejected from the compound punching upper die 3006 through the stripper block 3005, and the ejection process is completed.

[0101] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Those skilled in the art should understand that modifications or equivalent substitutions can be made to the specific implementation of the present invention with reference to the above embodiments. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention are within the protection scope of the pending claims.

Claims

1. A method for punching and extruding composite forming of a terminal block, wherein the terminal block includes a perforated disc portion and a terminal post portion, the terminal post portion and the perforated disc portion are connected by a connecting step portion, and the edge of the perforated disc portion is provided with a bent straight shank portion, characterized in that, The punching and extrusion composite forming method includes the following steps: Step 1: Use a punching and blanking die to punch and bend the round bar in one go to obtain the bent part; Step 2: Flatten the bent part and use the reserved cylindrical head at one end of the round bar as the terminal post. During the flattening process, a step is formed between the cylindrical head and the flattened part. Step 3: Perform compound punching on the flattened part of Step 2 to form a perforated round disc on the terminal block and a straight shank on one side of the perforated round disc in one step. The angle formed by the straight shank and the reserved cylindrical head is equal to the bending angle of the bar stock in Step 1. Step four: Bend the straight shank on the workpiece obtained in step three to obtain the forging part; Step 5: Machining the reserved cylindrical head portion in the forging part to obtain the terminal block of the part; machining the outer circle of the terminal block to obtain the finished part. The punching and blanking die in step one includes an upper die assembly and a lower die assembly. The upper die assembly has an upper punching and blanking die with a concave arc-shaped surface at its bottom that matches the outer circular surface of the bent part. The lower die assembly has a lower punching and blanking die with a groove for bending and deforming the round bar. The groove has a raised arc-shaped surface that matches the inner circular surface of the bent part. The lower die assembly also includes a sliding guide block with a through hole on its side for inserting the round bar. During punching and blanking, the upper die assembly presses down, and the upper and lower punching and blanking dies work together to bend the round bar. The sliding guide block moves downward after being pressed, causing the through hole of the sliding guide block and the upper surface of the lower punching and blanking die to misalign, thus shearing the round bar and separating the bent part.

2. The punching and extrusion composite forming method for a terminal block according to claim 1, characterized in that, In step one, the selected round bar material is T2 copper in Y2 state with a roughness of Ra1.6 or less.

3. The punching and extrusion composite forming method for a terminal block according to claim 1, characterized in that, In step two, the thickness of the flattened blank is 1±0.1mm.

4. The punching and extrusion composite forming method for a terminal block according to claim 1, characterized in that, In step two, the bending part is flattened using a flattening mold. The upper flattening mold of the flattening mold is provided with a stepped cavity. While the bending part is being flattened, the step is formed in the stepped cavity.

5. The punching and extrusion composite forming method for a terminal block according to claim 4, characterized in that, The flattening upper die is fixedly installed inside the flattening upper die fixing plate, and the lower part of the flattening upper die protrudes out of the flattening upper die fixing plate. An upper floating block is also floatingly installed inside the flattening upper die fixing plate. A lower floating block corresponding to the upper floating block is provided in the lower die assembly of the flattening die. The upper floating block and the lower floating block are used to clamp the cylindrical head at the end of the bent part.

6. The punching and extrusion composite forming method for a terminal block according to claim 1, characterized in that, In step three, a compound punching die is used to perform compound punching on the flattened part of the part.

7. The punching and extrusion composite forming method for a terminal block according to claim 6, characterized in that, The composite punching die includes an upper die assembly and a lower die assembly. The upper die assembly is fixedly provided with a downwardly extending composite punching upper punch and a composite punching upper die. A stripper block that can move up and down is provided in the die hole of the composite punching upper die. The stripper block has a through hole for the composite punching upper punch to pass through. The lower die assembly has a lower punch and die located directly below the stripper block. The lower punch and die has a die hole to accommodate the composite punching upper punch. During the mold closing process of the upper die assembly and the lower die assembly, a cavity to accommodate the reserved cylindrical head can be formed between the lower punch and die and the stripper block. The lower die assembly is provided with a groove to accommodate punching waste.

8. The punching and extrusion composite forming method for a terminal block according to claim 7, characterized in that, The upper die assembly is provided with a composite punch fixing plate located above the composite punching upper die. The upper part of the composite punching upper die is fixed inside the composite punching upper die fixing plate. A movable cavity is formed between the composite punching upper die fixing plate and the composite punching upper die. An annular stripper plate is provided inside the movable cavity and is fitted onto the composite punching upper die. The top surface of the annular stripper plate abuts against the lower end of the ejector rod that penetrates the composite punching upper die fixing plate and the composite punching upper die plate. The upper end of the ejector rod abuts against the punching upper die ejector plate that is floatingly disposed inside the punch press die shank.

9. The punching and extrusion composite forming method for a terminal block according to claim 7, characterized in that, Two positioning posts are spaced apart on the lower die, and the distance between the two positioning posts is equivalent to the diameter of the reserved cylindrical head in step two.

10. The punching and extrusion composite forming method for a terminal block according to claim 1, characterized in that, In step four, the bending angle of the straight handle is 90°±1°.

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