Closed insertion hoop forming mold assembly and forming method

Abstract

The invention belongs to the technical field of closed plug-in hoop forming processes, and particularly relates to a closed plug-in hoop forming die assembly and a forming method.The forming die assembly comprises a first-order forming die and a second-order forming die, the first-order forming die comprises a first-order lower die base and a first-order upper die base, and the second-order forming die comprises a second-order lower die base and a second-order lower die base; a first-order lower die insert, a first-order material supporting ejector and a first-order lower ejection spring are arranged on the first-order lower die base, the middle of the upper surface of the first-order material supporting ejector is a rectangular plane, and the two ends of the rectangular plane are first-order arc-shaped concave surfaces; the first-order upper die base comprises a first-order upper die insert and a first-order material pressing device, and the shape of the lower surface of the first-order upper die insert is matched with the shape of the upper surface of the first-order material supporting ejector. The first-order forming die is used for machining a flat plate into a middle plate, the second-order forming die is used for machining the middle plate into a closed insertion hoop, the part shaping amount is reduced through two-order forming, and the part forming consistency is ensured.

Description

Technical Field

[0001] The invention relates to a closed plug-in clamp forming die assembly and a forming method, belonging to the technical field of closed plug-in clamp forming processes. Background Art

[0002] As one of the core components of large harvesters, the fan disc clamp is located inside the fan impeller assembly and is a closed plug-in structure (see Fig.14 ), the structure of the closed plug-in clamp is a nearly circular closed clamp, the side of one end of which is bent and plugged into the plug-in hole on the side of the other end. The closed plug-in clamp is fixed on the fan disc, fixing the disc and the fan shaft together with high precision. The molding efficiency and part accuracy of the closed plug-in clamp are very critical to the assembly and use of the harvester. Therefore, the manufacturing process and accuracy of the fan disc clamp are very critical.

[0003] There are many methods for processing clamps, and the most common ones are as follows:

[0004] Mechanical processing: using equipment specially designed for making clamps, and directly processing using machine tools, without the need for molds, the processing speed is fast, but the shapes of the clamps that can be processed are relatively simple, and most of them are open clamps, and closed clamps cannot be processed;

[0005] Manual correction: Use simple molding molds to approximate the shape, and then use manual correction, but the surface accuracy error of the prepared parts is relatively large, and the efficiency is relatively low;

[0006] Compression molding: With the help of mold compression molding, three processes are required to form and press out parts. First, the sides of both sides of the closed plug-in clamp are formed to form a plug-in structure, and then the arc-shaped middle part of the product is partially formed by stamping. Since there is a punch on the top of the product, it cannot be directly stamped into a fully closed structure. It is necessary to use side shaping on both sides of the product in the last order, which can easily weaken the strength of the punch or interfere with the forming process.

[0007] At present, it still takes at least three steps to form a closed plug-in clamp by means of a mold. Therefore, it is necessary to find a molding process that reduces the sequence of mold forming steps of the closed plug-in clamp and avoids the interference of the punch in the product molding process. Summary of the invention

[0008] In view of the defects of the prior art, the present invention provides a closed plug-in clamp forming die assembly and a forming method.

[0009] The technical solution of the present invention to solve the above technical problems is as follows:

[0010] One of the purposes of the present invention is to provide a closed plug-in clamp forming mold assembly, including a first-order forming mold and a second-order forming mold, the first-order forming mold includes a first-order lower mold base and a first-order upper mold base, the first-order lower mold base is provided with a first-order lower mold insert, a first-order material support ejector and a first-order lower ejector spring, the first-order lower mold insert is fixedly mounted on the first-order lower mold base, the first-order material support ejector is movably mounted on the first-order lower mold base, the first-order lower mold insert is arranged at the end of the first-order material support ejector, the first-order lower ejector spring is arranged below the first-order material support ejector, the bottom surface of the first-order material support ejector is aligned with the first-order lower ejector spring The top surface of the spring is in contact with the first-order lower ejector spring. When the first-order lower ejector spring is not compressed, the height of the first-order support ejector is equal to or higher than the height of the first-order lower mold insert. The middle part of the upper surface of the first-order support ejector is a rectangular plane, and the two ends of the rectangular plane are first-order arc-shaped concave surfaces; the first-order upper mold base includes a first-order upper mold insert and a first-order presser. The first-order presser is movably mounted on the first-order upper mold insert. The bottom surface of the first-order presser is a plane. The first-order presser is arranged corresponding to the rectangular plane of the first-order support ejector. The shape of the lower surface of the first-order upper mold insert is adapted to the upper surface of the first-order support ejector.

[0011] The beneficial effects of the closed plug-in clamp forming die assembly of the present invention are:

[0012] The molding die assembly of the present invention comprises a first-order molding die and a second-order molding die. The first-order molding die is used to process a flat sheet of material into an intermediate sheet of material, and the second-order molding die is used to process the intermediate sheet of material into a closed plug-in clamp. In the first-order molding die of the present invention, the upper surface of the first-order support ejector is arranged to be a rectangular plane in the middle, and the two ends of the rectangular plane are first-order arc-shaped concave surfaces. Therefore, the first-order molding die can stamp out the flat sheet of material into an intermediate sheet of material with arc segments on both sides and a straight section in the middle, and simultaneously complete the molding of the sides at both ends of the intermediate sheet of material. The diameter of the two arc segments of the intermediate sheet of material is the same as the arc diameter of the final product, thereby realizing the pre-molding of the arc structure of the final closed plug-in clamp product, and can reduce the springback after the final arc molding, greatly reducing the debugging difficulty of the second-order molding die, and improving the debugging efficiency.

[0013] Furthermore, a first-order upper ejection spring is provided on the first-order upper die seat, and the end of the first-order upper ejection spring presses on the top surface of the first-order presser.

[0014] The beneficial effect of adopting the above-mentioned further technical scheme is: by pressing the first-order upper ejector spring on the top surface of the first-order presser, the flat plate material is firmly pressed at the beginning of the forming of the flat plate material, ensuring that the flat plate material is always stably and reliably positioned during the forming process; during the continuous downward process of the first-order upper die seat, when the first-order presser moves in the first-order upper die seat, the presser compresses the first-order upper ejector spring, and the compression rebound force of the first-order upper ejector spring continuously acts on the flat plate material plate, ensuring the stability of the forming process.

[0015] Furthermore, there are a plurality of first-order lower ejection springs, the first-order lower ejection spring is a nitrogen spring, and the first-order upper ejection spring is a nitrogen spring.

[0016] Further, the two-sequence forming mold includes a two-sequence lower die base and a two-sequence upper die base, the two-sequence lower die base is provided with a two-sequence lower die insert, a two-sequence lower die supporting member and a floating punch, the two-sequence lower die insert is fixedly installed on the two-sequence lower die base, the two-sequence lower die supporting member is movably installed on the two-sequence lower die insert, the floating punch is movably installed on the two-sequence lower die insert, and the middle part of the upper part of the two-sequence lower die supporting member is provided with a two-sequence arc-shaped concave surface; the floating punch includes a punch base and a punch body vertically installed on the side of the punch base, and the punch body is cylindrical; the two-sequence upper die first insert and the two-sequence upper die second insert are provided on the two-sequence upper die base, the two-sequence upper die first insert is arranged corresponding to the punch base, and the two-sequence upper die second insert is arranged corresponding to the punch body.

[0017] The beneficial effect of adopting the above-mentioned further technical scheme is: a floating punch is used for forming processing, and the floating punch adopts a punch body with a cylindrical structure. When the punch body presses down to form the middle arc segment of the intermediate material plate, the arcs at both ends of the intermediate material plate are turned upward, and finally hold on the cylindrical punch body to complete the forming processing of the middle arc segment of the clamp, so that the intermediate material plate is formed into a nearly circular closed plug-in clamp structure, and the punch body will not interfere with the side edges of the two ends of the intermediate material plate. Compared with the traditional processing method, the two-sequence forming mold of the present invention does not affect the feeding and picking process. During the forming process, the punch body will not interfere with the side edges and arc segments of the product, and the forming accuracy can also be guaranteed.

[0018] Furthermore, a punch floating groove for installing the floating punch is provided on the second-order lower die insert, the punch floating groove is arranged on one side of the second-order lower die support member, and the punch seat is movably inserted in the punch floating groove.

[0019] The beneficial effect of adopting the above further technical solution is that the floating punch is movably inserted in the punch floating groove, and the installation and movement of the floating punch are more stable.

[0020] Furthermore, a second-order lower die spring is provided on the inner bottom surface of the punch floating groove, and at least two second-order lower die springs are provided.

[0021] The beneficial effect of adopting the above-mentioned further technical scheme is: the second-order lower die spring provides support for the installation of the floating punch in the punch floating groove, and in the process of the second-order upper die seat pressing the material downward, the second-order upper die first insert and the second-order upper die second insert are pressed on the floating punch and drive the floating punch downward. In the process of the floating punch descending, the second-order lower die spring is compressed to make the floating punch descend stably. After the processing is completed, the second-order upper die seat ascends, and the floating punch rises steadily under the spring force of the second-order lower die spring for resetting, and drives the clamp product on it upward, which is convenient for the product to be discharged.

[0022] Furthermore, a pressing piece plane is provided on the upper side surface of the male mold body, and the end surface of the second insert of the second-order upper mold is a plane.

[0023] The beneficial effect of adopting the above-mentioned further technical scheme is: since the punch body is cylindrical, the cylindrical punch body is not conducive to the stability of the material pressing when the second-sequence upper die seat is descending. By setting the pressing piece plane, the stability of the second insert of the second-sequence upper die pressing on the punch body can be guaranteed, thereby ensuring the stability of the floating punch during the downward movement of the second-sequence upper die seat.

[0024] Furthermore, the end surface of the first insert of the second-order upper die is a plane, the top surface of the punch seat is a plane, and two first inserts of the second-order upper die are provided.

[0025] The beneficial effect of adopting the above further technical solution is: ensuring the stability of the first insert of the second-order upper die pressing on the punch seat.

[0026] Furthermore, a guide plate is provided on the side of the punch seat, and a guide groove is correspondingly provided on the inner wall of the punch floating groove.

[0027] The beneficial effect of adopting the above further technical solution is that, through the cooperation between the guide plate and the guide groove, a guiding effect is provided for the movement of the floating punch in the floating groove of the punch.

[0028] Furthermore, two groups of second-order side positioning members are provided on the second-order lower mold insert, and the two groups of second-order side positioning members are respectively arranged at two ends of the second-order lower mold supporting member, and each group includes two second-order side positioning members arranged opposite to each other.

[0029] The beneficial effect of adopting the above further technical solution is: the material plate placed on the second-order lower mold support material is positioned in the front and rear directions by the second-order side positioning piece to ensure the processing accuracy.

[0030] Furthermore, the second-sequence lower mold insert is provided with two sequence end positioning members, and two of the second-sequence end positioning members are provided opposite to each other, and the two second-sequence end positioning members are respectively arranged at two ends of the second-sequence lower mold supporting member.

[0031] The beneficial effect of adopting the above further technical solution is: the ends of the material plate placed on the second-order lower mold support material are positioned on the left and right sides by the second-order end positioning parts to ensure processing accuracy.

[0032] Furthermore, a second-order guide column is provided on the second-order lower die seat, and a second-order guide sleeve is correspondingly provided on the second-order upper die seat, and the aperture of the second-order guide sleeve is larger than the outer diameter of the second-order guide column.

[0033] The beneficial effect of adopting the above further technical solution is: through the cooperation of the second-order guide column and the second-order guide sleeve, the guidance of the up and down movement of the second-order upper die seat is achieved, ensuring the guiding accuracy of the die in the stamping direction.

[0034] Furthermore, the first-order upper mold insert is provided with a square through hole for installing the first-order presser, the inner end of the square through hole is provided with a limit platform, and the first-order presser is correspondingly provided with a boss.

[0035] The beneficial effect of adopting the above-mentioned further technical solution is: the boss is stuck on the limit table, so that the first-sequence presser is installed in the square through hole, realizing the installation of the first-sequence presser and preventing the first-sequence presser from falling from the first-sequence upper die base. During the stamping process, the first-sequence presser can also move in the square through hole.

[0036] Furthermore, first-order side positioning members are respectively provided on both sides of the first-order material supporting ejector, and the height of the first-order side positioning members is higher than the height of the first-order material supporting ejector.

[0037] The beneficial effect of adopting the above further technical solution is: the flat plate placed on the first-order material support ejector is positioned in the front and rear directions by the first-order side positioning member to ensure the processing accuracy.

[0038] Furthermore, the ends of the first-order support ejector and the first-order lower mold insert that are opposite to each other are respectively provided with a sequence end positioning piece, and when the first-order lower ejection spring is not compressed, the height of the first-order end positioning piece is higher than the height of the first-order support ejector.

[0039] The beneficial effect of adopting the above further technical solution is: the ends of the flat plate placed on the first-order material support ejector are positioned on the left and right sides by a first-order end positioning piece to ensure processing accuracy.

[0040] Furthermore, a first-order guide column is provided on the first-order lower die base, and a first-order guide sleeve is correspondingly provided on the first-order upper die base, and the aperture of the first-order guide sleeve is larger than the outer diameter of the first-order guide column.

[0041] The beneficial effect of adopting the above further technical solution is: through the cooperation of the first-order guide column and the first-order guide sleeve, the first-order upper die seat is guided for up and down movement, ensuring the guiding accuracy of the first-order forming die in the stamping direction.

[0042] Furthermore, a first-order pad and a first-order fixed plate are provided on the first-order lower die base, the first-order fixed plate is arranged above the first-order pad, the first-order fixed plate is provided with a through groove for installing the first-order lower die insert and the first-order material support ejector, the first-order material support ejector is movably installed in the through groove, the first-order lower ejector spring is installed on the first-order pad, and the first-order lower die insert is fixedly installed on the first-order pad.

[0043] Furthermore, a guide plate is provided on the first-order material support ejector, and a guide sliding surface is correspondingly provided on the inner side of the through groove of the first-order fixed plate.

[0044] The beneficial effect of adopting the above-mentioned further technical scheme is: a first-order material support ejector and a first-order lower mold insert are installed by a first-order pad and a first-order fixed plate, providing a stable installation for the first-order material support ejector and the first-order lower mold insert, and a guide sliding surface is provided in the through groove of the first-order fixed plate, which cooperates with the guide plate to provide a limiting guiding effect on the movement of the first-order material support ejector.

[0045] The second object of the present invention is to provide a closed plug-in clamp forming method, comprising a first sequence process and a second sequence process, wherein:

[0046] The first process processes the flat sheet into an intermediate sheet with arc segments on both sides and a straight section in the middle, and forms the shapes of the side edges at both ends of the flat sheet;

[0047] The two-step process processes the straight section in the middle of the intermediate material plate into an arc section. During the process of processing the middle arc section, the arc sections at both ends of the intermediate material plate rotate upward until the side edge of one end of the intermediate material plate is plugged into the side edge of the other end, completing the forming of the closed plug-in clamp.

[0048] The beneficial effects of the closed plug-in hoop forming method of the present invention are:

[0049] The present invention adopts two-sequence forming. The first sequence processes the arc segments and side edges of the two ends of the material plate. The second sequence performs secondary forming on the basis of the forming structure of the first sequence to form the arc segment in the middle of the material plate. During the two-sequence forming process, the arc segment formed by the first sequence is flipped upward to form a nearly circular clamp structure of a closed plug-in clamp, which reduces the amount of part shaping and ensures the consistency of part molding. It is suitable for the stamping forming of closed plug-in clamps of thin or thick plates.

[0050] Furthermore, the use of the above-mentioned closed plug-in clamp forming mold assembly includes the following steps: 1. Using a first-order forming mold to complete the processing of a first-order process; in the first-order process, the plug-in hole has been processed on the side edge of one end of the flat material plate; 2. Using a second-order forming mold to complete the processing of the second-order process.

[0051] Further, the following steps are specifically included:

[0052] 1. First order process:

[0053] S11, placing the flat sheet on a first-order support ejector of a first-order lower die seat and a first-order lower die insert;

[0054] S12, the first-order upper die seat moves downward, compressing the first-order upper ejection spring and the first-order lower ejection spring to achieve the effect of upper and lower suspended pressing;

[0055] S13, the first-order upper die seat continues to move downward, and the first-order presser and the first-order support ejector jointly squeeze the middle of the flat plate until two arc segments are jointly pressed out on the flat plate;

[0056] S14, the first-order upper die seat continues to move downward, driving the first-order support ejector and the first-order lower die insert to produce relative movement, so that the end of the material plate is bent, and the side of the end of the closed plug-in hoop for plug-in is pressed out, completing the pressing and forming of the middle material plate;

[0057] S15, the first-order upper die seat moves upward, and the first-order lower ejector spring resets, thereby driving the first-order support ejector to move upward and eject the middle material plate;

[0058] 2. Second order process:

[0059] S21, placing the middle material plate on the second-order lower die support member of the second-order lower die seat;

[0060] S22, the second-order upper die seat moves downward, driving the first insert of the second-order upper die and the second insert of the second-order upper die to move downward, driving the floating punch to move downward and compressing the second-order lower die spring, thereby achieving the effect of floating material pressing;

[0061] S23, the second-order upper die seat continues to move downward, the punch body and the second-order lower die support jointly press the straight section of the middle plate into an arc section, and the arc sections at both ends of the middle plate turn upward to hold the punch body, pressing to form a closed plug-in clamp shape;

[0062] S24, the second-order upper die seat moves upward, the second-order lower die spring returns to its original position, the floating punch drives the product upward, the product is slid to the end of the punch body and removed, and the pressing and forming of the closed plug-in clamp is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 It is a three-dimensional structural schematic diagram of a sequential forming mold;

[0064] Figure 2 Schematic diagram of the three-dimensional structure of a lower die base;

[0065] Figure 3 It is a structural schematic diagram of a first-order ejector spring;

[0066] Figure 4It is a structural schematic diagram of a first-order upper die base;

[0067] Figure 5 It is a structural schematic diagram of a first-order press;

[0068] Figure 6 This is a schematic diagram of the mold opening process after the intermediate sheet is pressed in a first sequence process;

[0069] Figure 7 It is a schematic diagram of the three-dimensional structure of the two-sequence molding die;

[0070] Figure 8 It is a structural schematic diagram of the second-order lower die base;

[0071] Fig. 9 It is a structural schematic diagram of the floating punch;

[0072] Fig.10 It is a structural schematic diagram of the second-order upper die base;

[0073] Fig.11 This is a schematic diagram of the product status after the second sequence process is completed;

[0074] Fig.12 It is a schematic diagram of the structure of a flat sheet to be pressed;

[0075] Fig.13 It is a schematic diagram of the structure of the intermediate material plate formed in a sequence process;

[0076] Fig.14 It is a structural schematic diagram of a closed plug-in clamp;

[0077] Fig.15 It is a schematic diagram of the clamping state of the second-order upper mold base;

[0078] Fig.16 It is a schematic diagram of the process of forming the intermediate material plate into a closed plug-in clamp.

[0079] The reference numerals are recorded as follows: 100, a first sequence lower die base; 101, a first sequence lower die insert; 102, a first sequence support ejector; 103, a first sequence side positioning member; 104, a first sequence lower ejector spring; 105, a first sequence guide column; 106, a first sequence pad; 107, a first sequence fixed plate; 108, a first sequence end positioning member; 200, a first sequence upper die base; 201, a first sequence upper die insert; 202, a first sequence guide sleeve; 203, a first sequence upper ejector spring; 204, a first sequence press; 300, Second sequence lower die seat; 301, second sequence lower die insert; 302, second sequence lower die supporting piece; 303, second sequence side positioning piece; 304, second sequence lower die spring; 305, second sequence guide column; 306, second sequence end positioning piece; 307, punch floating groove; 400, floating punch; 401, punch seat; 402, punch body; 403, pressing piece plane; 500, second sequence upper die seat; 501, second sequence upper die first insert; 502, second sequence upper die second insert; 503, second sequence guide sleeve. DETAILED DESCRIPTION

[0080] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0081] Example 1

[0082] See also Figure 1-Figure 11 A closed plug-in clamp forming mold assembly includes a first-order forming mold and a second-order forming mold.

[0083] See also Figure 1-Figure 6The first-order molding mold includes a first-order lower die base 100 and a first-order upper die base 200. The first-order lower die base 100 is provided with a first-order lower die insert 101, a first-order support ejector 102 and a first-order lower ejector spring 104. The first-order lower die insert 101 is fixedly installed on the first-order lower die base 100, and the first-order support ejector 102 is movably installed on the first-order lower die base 100. The first-order lower die insert 101 is arranged at the end of the first-order support ejector 102. Specifically, in this embodiment, the first-order lower die base 100 is provided with a first-order pad 106 and a first-order fixed plate 107. The first-order fixed plate 107 is arranged above the first-order pad 106. The first-order pad 106 and the first-order fixed plate 107 are bolted together. The first-order lower die base 100 is fixedly mounted with a pin, a through groove for mounting a first-order lower die insert 101 and a first-order material support ejector 102 is provided on the first-order fixed plate 107, the first-order material support ejector 102 is movably mounted in the through groove, a guide plate is provided on the first-order material support ejector 102, a guide sliding surface is correspondingly provided on the inner side of the through groove of the first-order fixed plate 107, a first-order lower ejector spring 104 is mounted on the first-order pad 106, the first-order lower die insert 101 is fixedly mounted on the first-order pad 106 by bolts and pins, and during the downward process of the first-order upper die base 200, the first-order material support ejector 102 is driven to move, so that the first-order material support ejector 102 and the first-order lower die insert 101 can produce relative movement.

[0084] See also Figure 3 , there are multiple first-order lower ejection springs 104, and the first-order lower ejection springs 104 are nitrogen springs. The first-order lower ejection springs 104 are arranged on the first-order pad 106 and below the first-order support ejector 102. The bottom surface of the first-order support ejector 102 contacts the top surface of the first-order lower ejection spring 104. When the first-order lower ejection spring 104 is not compressed, the height of the first-order support ejector 102 is equal to or higher than the height of the first-order lower mold insert 101. Specifically, in this embodiment, the height of the first-order support ejector 102 is equal to the height of the first-order lower mold insert 101. In the initial state, In this state, when the flat material plate is placed on the first-order material support ejector 102, the flat material plate can be placed stably without shaking or deflecting. A first-order material support limiting screw is movably provided on the first-order pad 106, and the end of the first-order material support limiting screw is connected to the first-order material support ejector 102. The first-order material support limiting screw is used to limit the ejection stroke of the first-order material support ejector 102 to prevent the first-order material support ejector 102 from being ejected out of the through slot under the spring force of the first-order ejector spring 104.

[0085] The middle part of the upper surface of the first-order support ejector 102 is a rectangular plane, and the two ends of the rectangular plane are first-order circular arc concave surfaces. There is an arc transition between the rectangular plane and the first-order circular arc concave surface, and the curvature of the first-order circular arc concave surface is adapted to the curvature of the final product. The two ends of the upper surface of the first-order support ejector 102 are planes, and there is an arc transition between the planes at both ends of the first-order support ejector 102 and the first-order circular arc concave surface; first-order side positioning members 103 are respectively provided on both sides of the first-order support ejector 102, and the height of the first-order side positioning members 103 is higher than the height of the first-order support ejector 102; the first-order support ejector 102 and the first-order lower mold insert 101 are respectively provided with a first-order end positioning member 108 at the end portions facing away from each other, and when the first-order lower ejection spring 104 is not compressed, the height of the first-order end positioning member 108 is higher than the height of the first-order support ejector 102.

[0086] The first-order upper die base 200 includes a first-order upper die insert 201 and a first-order presser 204. The first-order presser 204 is movably mounted on the first-order upper die insert 201. Specifically, the first-order upper die insert 201 is provided with a square through hole for mounting the first-order presser 204. The inner end of the square through hole is provided with a limit platform. The first-order presser 204 is correspondingly provided with a boss. The bottom surface of the first-order presser 204 is a plane. The first-order presser 204 is arranged corresponding to the rectangular plane of the first-order support ejector 102. The shape of the lower surface of the first-order upper die insert 201 is adapted to the upper surface of the first-order support ejector 102, that is, the lower surface of the first-order upper die insert 201 is provided with an arc-shaped convex surface corresponding to the first-order arc-shaped concave surface of the first-order support ejector 102.

[0087] A first-order upper ejection spring 203 is provided on the first-order upper die base 200, and the end of the first-order upper ejection spring 203 presses on the top surface of the first-order presser 204. The first-order upper ejection spring 203 is a nitrogen spring.

[0088] A first-order guide column 105 is provided on the first-order lower die base 100 , and a first-order guide sleeve 202 is correspondingly provided on the first-order upper die base 200 . The aperture of the first-order guide sleeve 202 is larger than the outer diameter of the first-order guide column 105 .

[0089] See also Figure 7-Figure 11The second-order molding die comprises a second-order lower die base 300 and a second-order upper die base 500. The second-order lower die base 300 is provided with a second-order lower die insert 301, a second-order lower die supporting member 302 and a floating punch 400. The second-order lower die insert 301 is fixedly mounted on the second-order lower die base 300, and the second-order lower die supporting member 302 is movably mounted on the second-order lower die insert 301. Specifically, an installation groove for installing the second-order lower die supporting member 302 is provided on the second-order lower die insert 301. The first lower die support piece 302 is movably installed in the installation groove, and the height of the second lower die support piece 302 is higher than the height of the installation groove. A second-order support ejection spring and a second-order support limit screw are arranged in the installation groove. The top of the second-order support ejection spring contacts the bottom surface of the second lower die support piece 302. The second-order support limit screw is movably installed on the second lower die insert 301. The second-order support limit screw is connected to the second lower die support piece 302 for adjusting the second lower die support piece 302. 02 provides a limiting effect for sliding in the installation groove to prevent the second-order lower mold support member 302 from being ejected out of the installation groove under the spring force of the second-order support ejection spring. A guide plate is provided on the side of the second-order lower mold support member 302, and a guide sliding surface is provided on the inner side of the installation groove; the floating punch 400 includes a punch seat 401 and a punch body 402, and the punch body 402 is vertically installed on the upper part of the side of the punch seat 401, and the punch body 402 is cylindrical; the floating punch 4 00 is movably installed on the second-order lower mold insert 301. Specifically, the second-order lower mold insert 301 is provided with a punch floating groove 307 for installing the floating punch 400. The punch floating groove 307 is arranged on one side of the second-order lower mold support 302, that is, the installation groove and the punch floating groove 307 are arranged in parallel, and the bottom of the punch seat 401 is movably inserted in the punch floating groove 307; the side of the punch seat 401 is provided with a guide plate, and the inner wall of the punch floating groove 307 is correspondingly provided with a guide sliding surface. The middle part of the upper part of the second-order lower mold support 302 is provided with a second-order arc-shaped concave surface, and the two ends of the second-order arc-shaped concave surface are planes, and the upper part of the plane is provided with an arc-shaped concave, which is convenient for Fig.13 The arc segments at both ends of the intermediate material plate are placed as shown; a second-order lower die spring 304 is provided on the inner bottom surface of the punch floating groove 307, and the top surface of the second-order lower die spring 304 is on the punch seat 401. There are at least two second-order lower die springs 304, and the second-order lower die spring 304 is a nitrogen spring. Two groups of second-order side positioning members 303 are provided on the second-order lower die insert 301, and the two groups of second-order side positioning members 303 are respectively arranged at the two ends of the second-order lower die support member 302, and each group includes two second-order side positioning members 303 arranged oppositely. A second-order end positioning member 306 is provided on the second-order lower die insert 301, and two second-order end positioning members 306 are arranged oppositely, and the two second-order end positioning members 306 are respectively arranged at the two ends of the second-order lower die support member 302.

[0090] The second-order upper die seat 500 is provided with a second-order upper die first insert 501 and a second-order upper die second insert 502 . The second-order upper die first insert 501 is arranged corresponding to the punch seat 401 , and the second-order upper die second insert 502 is arranged corresponding to the punch body 402 .

[0091] A pressing piece plane 403 is provided on the upper side surface of the male mold body 402, and the end surface of the second insert 502 of the second-order upper mold is a plane.

[0092] The end surface of the first insert 501 of the second-order upper die is a plane, and the top surface of the punch seat 401 is a plane. There are two first inserts 501 of the second-order upper die.

[0093] A second-order guide column 305 is provided on the second-order lower die seat 300 , and a second-order guide sleeve 503 is correspondingly provided on the second-order upper die seat 500 . The aperture of the second-order guide sleeve 503 is larger than the outer diameter of the second-order guide column 305 .

[0094] Example 2

[0095] A closed plug-in clamp forming method includes a first-order process and a second-order process, wherein:

[0096] The first process processes the flat sheet into an intermediate sheet with arc segments on both sides and a straight section in the middle, and forms the shape of the sides at both ends of the flat sheet, wherein one side of the flat sheet has been processed with a plug hole (see Fig.12 );

[0097] The second process processes the straight section in the middle of the intermediate material plate into an arc section. During the process of processing the middle arc section, the arc sections at both ends of the intermediate material plate rotate upward until the side edge of one end of the intermediate material plate is plugged into the side edge of the other end, completing the forming of the closed plug-in clamp.

[0098] Specifically, in this embodiment, the method of the present invention can be implemented by using the closed plug-in clamp forming die assembly as described in Example 1, and specifically includes the following steps:

[0099] 1. First order process:

[0100] S11, in the initial state, the first sequence upper die holder 200 is away from the first sequence lower die holder 100, and the flat plate (see Fig.12 ) is placed on a first-order support ejector 102 and a first-order lower die insert 101 of a first-order lower die base 100, and the front and rear side surfaces and the left and right end surfaces of the flat plate are positioned and limited by a first-order side positioning member 103 and a first-order end positioning member 108 to ensure the stability of the flat plate during loading and stamping;

[0101] S12, after the flat sheet is placed stably, the first-order upper die holder 200 moves downward, driving the first-order upper die insert 201 and the first-order presser 204 to move downward. The first-order presser 204 first presses the middle position of the flat sheet to ensure the stability of the flat sheet. The first-order upper die holder 200 continues to move downward to compress the first-order upper ejection spring 203. Since a first-order lower ejection spring 104 is provided below the first-order support ejector 102, the first-order upper die holder 200 continues to move downward to compress the first-order lower ejection spring 104, thereby achieving the effect of upper and lower suspended pressing.

[0102] S13, the first-order upper die holder 200 continues to move downward until the first-order upper die insert 201 contacts the flat sheet, and the first-order presser 204 and the first-order support ejector 102 jointly press the middle of the flat sheet. After pressing the middle of the flat sheet, the first-order upper die holder 200 continues to move downward until the first-order upper die insert 201 and the first-order support ejector 102 jointly press two arc segments on the flat sheet;

[0103] S14, the first-order upper die seat 200 continues to move downward and continues to compress the first-order lower ejector spring 104, driving the first-order material support ejector 102 downward, and the first-order material support ejector 102 and the first-order lower die insert 101 generate relative movement, thereby driving the material plate downward, and under the action of the first-order lower die insert 101, the end of the material plate is bent (here the end of the material plate that is bent is the end without the processing plug-in hole), and the side of the end of the closed plug-in hoop for plug-in is pressed out, completing the pressing and forming of the middle material plate;

[0104] S15, the first-order upper die holder 200 moves upward, and the first-order lower ejector spring 104 is reset, thereby driving the first-order support ejector 102 to move upward (see Figure 6 ), eject the middle sheet, making it easier to remove the middle sheet;

[0105] 2. Second order process:

[0106] S21, in the initial state, the second-order upper die holder 500 is away from the second-order lower die holder 300, and the intermediate material plate obtained by the first-order process (see Fig.13 ) is placed on the second-order lower die support 302 of the second-order lower die seat 300, and the front and rear side surfaces and the left and right end surfaces of the intermediate material plate are positioned and limited by the second-order side positioning members 303 and the second-order end positioning members 306, respectively, to ensure the stability of the intermediate material plate during the loading and stamping process;

[0107] S22, after the middle material plate is placed stably, the second-order upper die seat 500 moves downward, driving the first insert 501 and the second insert 502 of the second-order upper die to move downward, the first insert 501 of the second-order upper die is pressed on the top surface of the punch seat 401, and the second insert 502 of the second-order upper die is pressed on the pressing piece plane 403 of the punch body 402, the second-order upper die seat 500 continues to move downward, driving the floating punch 400 downward and compressing the second-order lower die spring 304, to achieve the effect of floating material pressing;

[0108] S23, the second-order upper die holder 500 continues to move downward until the punch body 402 contacts the straight section in the middle of the intermediate sheet, and then the second-order upper die holder 500 continues to move downward, driving the punch body 402 and the second-order lower die support 302 to jointly press the straight section of the intermediate sheet into an arc section. During this forming process, the arc sections at both ends of the intermediate sheet turn upward to hold the punch body 402 until one side of the intermediate sheet is plugged into the other side, and pressed into the shape of a closed plug-in clamp (see Fig.15 );

[0109] S24, the second-order upper die seat 500 moves upward, the second-order upper die first insert 501 and the second-order upper die second insert 502 leave the punch seat 401 and the punch body 402, and the second-order lower die spring 304 is reset, thereby driving the floating punch 400 to move upward, and the floating punch 400 drives the product to move upward and leave the second-order lower die support 302. Since the product is held on the punch body 402, the product is slid to the end of the punch body 402 and removed, which is convenient for taking the product out. At this point, the pressing and forming process of the closed plug-in clamp is completed (see Fig.11 ,in, Fig.11 The middle punch body 402 has been separated from the second-order lower die holder 300, and the product has been separated from the punch body 402).

[0110] See also Fig.16 , is a schematic diagram of the process change state of the intermediate material plate of the present invention being formed into a closed plug-in clamp product.

[0111] The difference between the present invention and the traditional mold forming scheme is that the first-order forming process of the traditional scheme only flanging the two sides of the part, while the first-order forming mold of the present invention can process an intermediate material plate structure with arc segments on both sides and a straight section in the middle in the first process, and simultaneously form the shapes of the side edges at both ends, so that the diameters of the two arc segments are the same as the diameter of the final clamp product, which is equivalent to pre-forming the arc segments of the final clamp product. This pre-forming plays a vital role in reducing the rebound after the final arc forming, greatly reducing the debugging difficulty of the second-order forming mold and improving the debugging efficiency; the present invention also adopts an upper and lower suspended pressing structure to ensure the stable positioning of the part during the initial positioning of the part. This is a prerequisite for ensuring the accuracy of the part, and can also ensure stability and reliability during the forming process, especially in the second process, which creatively adopts the floating positioning of the cylindrical punch body, which not only ensures the forming accuracy, but also solves the problems of feeding and picking of the closed clamp and interference of the punch.

[0112] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A closed plug-in clamp forming die assembly, characterized in that: The invention comprises a first-order molding die and a second-order molding die, wherein the first-order molding die comprises a first-order lower die base (100) and a first-order upper die base (200), wherein the first-order lower die base (100) is provided with a first-order lower die insert (101), a first-order support ejector (102) and a first-order lower ejector spring (104), wherein the first-order lower die insert (101) is fixedly mounted on the first-order lower die base (100), and the first-order support ejector (102) is movably mounted on the first-order lower die base (100), wherein the first-order lower die insert (101) is arranged at the end of the first-order support ejector (102), and the first-order lower ejector spring (104) is arranged below the first-order support ejector (102), and the first-order support ejector The bottom surface of (102) contacts the top surface of the first-order lower ejector spring (104); the middle part of the upper surface of the first-order support ejector (102) is a rectangular plane, and the two ends of the rectangular plane are first-order arc-shaped concave surfaces; the first-order upper mold base (200) includes a first-order upper mold insert (201) and a first-order presser (204); the first-order presser (204) is movably installed on the first-order upper mold insert (201); the bottom surface of the first-order presser (204) is a plane; the first-order presser (204) is arranged corresponding to the rectangular plane of the first-order support ejector (102); the shape of the lower surface of the first-order upper mold insert (201) is adapted to the upper surface of the first-order support ejector (102).

2. The closed plug-in clamp forming die assembly according to claim 1, characterized in that: The first-order upper die seat (200) is provided with a first-order upper ejection spring (203), and the end of the first-order upper ejection spring (203) presses on the top surface of the first-order presser (204).

3. The closed plug-in clamp forming die assembly according to claim 2, characterized in that: The first-order lower ejection spring (104) is provided in plurality, the first-order lower ejection spring (104) is a nitrogen spring, and the first-order upper ejection spring (203) is a nitrogen spring.

4. The closed plug-in clamp forming die assembly according to any one of claims 1 to 3, characterized in that: The second-order molding die comprises a second-order lower die base (300) and a second-order upper die base (500); the second-order lower die base (300) is provided with a second-order lower die insert (301), a second-order lower die supporting member (302) and a floating punch (400); the second-order lower die insert (301) is fixedly mounted on the second-order lower die base (300); the second-order lower die supporting member (302) is movably mounted on the second-order lower die insert (301); the floating punch (400) is movably mounted on the second-order lower die insert (301); the second-order lower die supporting member (302) is movably mounted on the second-order lower die 02) is provided with a second-order arc-shaped concave surface in the middle of the upper part; the floating punch (400) includes a punch seat (401) and a punch body (402) vertically installed on the side of the punch seat (401), and the punch body (402) is cylindrical; the second-order upper die seat (500) is provided with a second-order upper die first insert (501) and a second-order upper die second insert (502), the second-order upper die first insert (501) is arranged corresponding to the punch seat (401), and the second-order upper die second insert (502) is arranged corresponding to the punch body (402).

5. The closed plug-in clamp forming die assembly according to claim 4, characterized in that: The second-order lower die insert (301) is provided with a punch floating groove (307) for installing the floating punch (400), the punch floating groove (307) is arranged on one side of the second-order lower die support (302), the punch seat (401) is movably inserted in the punch floating groove (307), and the second-order lower die spring (304) is provided on the inner bottom surface of the punch floating groove (307), and the second-order lower die spring (304) is provided with at least two.

6. The closed plug-in clamp forming die assembly according to claim 5, characterized in that: The upper side surface of the punch body (402) is provided with a pressing piece plane (403), the end surface of the second insert (502) of the second-order upper mold is a plane, the end surface of the first insert (501) of the second-order upper mold is a plane, the top surface of the punch seat (401) is a plane, and two first inserts (501) of the second-order upper mold are provided.

7. The closed plug-in clamp forming die assembly according to claim 3, characterized in that: The first-order upper mold insert (201) is provided with a square through hole for installing the first-order presser (204), the inner end of the square through hole is provided with a limit platform, and the first-order presser (204) is correspondingly provided with a boss.

8. A closed plug-in clamp forming method, characterized in that: It includes the first-order process and the second-order process, in which: The first process processes the flat sheet into an intermediate sheet with arc segments on both sides and a straight section in the middle, and forms the shapes of the side edges at both ends of the flat sheet; The two-step process processes the straight section in the middle of the intermediate material plate into an arc section. During the process of processing the middle arc section, the arc sections at both ends of the intermediate material plate rotate upward until the side edge of one end of the intermediate material plate is plugged into the side edge of the other end, completing the forming of the closed plug-in clamp.

9. The closed plug-in clamp forming method according to claim 8, characterized in that: The closed plug-in clamp forming die assembly according to any one of claims 1 to 7 comprises the following steps:

1. Use a one-sequence forming mold to complete the processing of a one-sequence process; 2. Use a two-stage forming mold to complete the processing of the two-stage process; In a first process, a plug-in hole is processed on one side of the flat sheet.

10. The closed plug-in clamp forming method according to claim 9, characterized in that: The specific steps include:

1. First order process: S11, placing a flat plate on a first-order material ejector (102) of a first-order lower die base (100) and a first-order lower die insert (101); S12, the first-order upper die seat (200) moves downward, compressing the first-order upper ejection spring (203) and the first-order lower ejection spring (104), thereby achieving the effect of upper and lower suspended pressing of materials; S13, the first-order upper die seat (200) continues to move downward, and the first-order material presser (204) and the first-order material ejector (102) jointly press the middle part of the flat plate until two arc segments are jointly pressed out on the flat plate; S14, the first-order upper die seat (200) continues to move downward, driving the first-order material ejector (102) and the first-order lower die insert (101) to produce relative movement, so that the end of the material plate is bent, and the side of the end of the closed plug-in hoop for plug-in is pressed out, thereby completing the pressing and forming of the middle material plate; S15, the first-order upper die seat (200) moves upward, and the first-order lower ejection spring (104) is reset, thereby driving the first-order support ejector (102) to move upward to eject the middle material plate; 2. Second order process: S21, placing the intermediate material plate on the second-order lower die support member (302) of the second-order lower die seat (300); S22, the second-order upper die seat (500) moves downward, driving the first insert (501) and the second insert (502) of the second-order upper die downward, driving the floating punch (400) downward and compressing the second-order lower die spring (304), thereby achieving the floating material pressing effect; S23, the second-order upper die seat (500) continues to move downward, and the punch body (402) and the second-order lower die support member (302) jointly press the straight section of the middle material plate into an arc section, and the arc sections at both ends of the middle material plate are turned upward to hold the punch body (402), and pressed to form a closed plug-in clamp shape; S24, the second-order upper die seat (500) moves upward, the second-order lower die spring (304) is reset, the floating punch (400) drives the product upward, and the product is slid to the end of the punch body (402) and removed, completing the compression molding of the closed plug-in clamp.

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