Stamping die for square wiring terminal

Abstract

The utility model discloses a stamping die for a square wiring terminal, belongs to the technical field of stamping dies, and solves the problem that the square end of the square wiring terminal is uneven due to the fact that an existing die does not secondarily extrude a blank piece. The extrusion die comprises an upper die base and a lower die base, a first upper clamping plate and a second upper clamping plate which are adjacent to each other are arranged on the bottom face of the upper die base, a first lower die plate and a second lower die plate are arranged on the top face of the lower die base, and a rough extrusion assembly and a fine extrusion assembly which are adjacent to each other are arranged between the first upper clamping plate and the first lower die plate. A profiling cutting-off assembly is arranged between the second upper clamping plate and the second lower die plate. According to the utility model, the rough extrusion assembly and the fine extrusion assembly are used for carrying out punch forming on the middle part of the round tube blank twice, so that not only is the round tube blank in the shape of an inverted isosceles trapezoid prevented from rebounding, but also the fine extrusion assembly improves the flatness of the middle part of the round tube blank in the shape of the inverted isosceles trapezoid; therefore, the square end of the square wiring terminal is smoother.

Description

Technical Field

[0001] The utility model relates to the technical field of stamping dies, in particular to a stamping die for square connection terminals. Background Art

[0002] Square terminal blocks are an electrical connection element, usually referring to terminals that are shaped like a square. In electrical engineering, the design feature of square terminal blocks is that they are suitable for connecting wires with larger cross-sectional areas, such as multi-strand copper core wires or aluminum core wires commonly used in power systems, industrial control systems, building wiring, etc.

[0003] Square terminal blocks generally have a larger contact area and strength to accommodate thicker wires. In addition, square terminal blocks usually have a higher current carrying capacity and can maintain stable operation under high load conditions. At the same time, the design fully considers heat dissipation and fire prevention performance to ensure the safety of electrical connections.

[0004] The existing square terminal blocks are formed by stamping. The blank of the square terminal blocks is a round tube. The existing stamping die first stamps the middle part of the round tube into an inverted isosceles trapezoidal shape with the cooperation of the stamping machine. Figure 7 Finally, cut off two square terminals from the middle of the round tube. The shape of the square terminals is as follows: Figure 5 and Figure 6 Although the prior art has only two steps, when the square end of the square terminal is large, the inverted isosceles trapezoidal round tube has springback, and there is no secondary extrusion process, so that the square end of the produced square terminal is not flat. Figure 8 shown. Utility Model Content

[0005] In view of the above problems in the prior art, the utility model provides a stamping die for a square terminal block, which solves the problem that the square end of the square terminal block is uneven due to the lack of secondary extrusion of the blank in the prior die.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0007] A stamping die for a square terminal block is provided, comprising an upper die base and a lower die base, wherein the upper die base and the lower die base are respectively arranged at the upper end and the lower end of a guide column assembly; a first upper clamping plate and a second upper clamping plate adjacent to each other are arranged on the bottom surface of the upper die base, a first lower template and a second lower template are arranged on the top surface of the lower die base, a rough extrusion assembly and a fine extrusion assembly adjacent to each other are arranged between the first upper clamping plate and the first lower template, the rough extrusion assembly is used to extrude the middle part of a round tube blank into an inverted isosceles trapezoidal shape, and the fine extrusion assembly is used to perform secondary extrusion on the middle part of the round tube blank; a profiling cutting assembly is arranged between the second upper clamping plate and the second lower template; the profiling cutting assembly is used to cut the round tube blank with a flat middle part into two square terminal blocks.

[0008] In this scheme, the middle part of the round tube blank is stamped and formed twice by using a rough extrusion component and a fine extrusion component, which not only avoids the springback of the round tube blank in the shape of an inverted isosceles trapezoid, but also improves the flatness of the middle part of the round tube blank in the shape of an inverted isosceles trapezoid by the fine extrusion component, thereby making the square end of the square terminal block flatter.

[0009] Furthermore, the rough extrusion assembly, the fine extrusion assembly and the profile cutting assembly all include positioning mechanisms, each of which includes four positioning blocks, which are arranged in groups of two, and the two positioning blocks in each group are respectively fixedly connected to the upper die base and the lower die base, and positioning grooves are provided on adjacent surfaces of the two positioning blocks in each group, and one end of the outer wall of the round tube blank is located in the two positioning grooves. The positioning grooves are arranged to facilitate positioning of the round tube blank.

[0010] Furthermore, the diameter of each positioning groove is equal to the diameter of the round tube blank.

[0011] Furthermore, the rough extrusion assembly includes a first upper mold forming block fixed on the first upper clamping plate and a first lower mold forming block fixed on the first lower mold plate, and the first upper mold forming block and the first lower mold forming block are both located between two positioning blocks; the bottom of the first upper mold forming block is a protrusion with an inverted isosceles trapezoidal shape on the side, and the first lower mold forming block is provided with a groove that cooperates with the protrusion.

[0012] Furthermore, the precision extrusion assembly includes a second upper die forming block fixed on the first upper clamping plate and a second lower die forming block fixed on the first lower template, and the second upper die forming block and the second lower die forming block are both located between the two positioning blocks; the bottom of the second upper die forming block is a protrusion in the shape of an inverted isosceles trapezoid on the side, and the second lower die forming block is provided with a groove matching the protrusion; in order to improve the processing accuracy of the second upper die forming block and the second lower die forming block, the tolerances of the second upper die forming block and the second lower die forming block are made smaller than the tolerances of the first upper die forming block and the first lower die forming block, thereby improving the flatness of the middle part of the round tube in the shape of an inverted isosceles trapezoid.

[0013] Furthermore, the rough extrusion assembly also includes two inserting knife slider mechanisms symmetrically located on both sides of the first upper die forming block, each inserting knife slider mechanism includes an inserting knife and a slider respectively arranged on the first upper clamping plate and the first lower template; the contact surface between the inserting knife and the slider is an inclined surface; two core rods for inserting into the inner tube of the round tube blank are arranged on the side of the slider close to the round tube blank; the first upper clamping plate drives the inserting knife to move downward, the inserting knife extrusion slider slides on the first lower template, and the slider slides along the axial direction of the round tube blank so that the core rod on the slider is inserted into the round tube blank. The inserting knife drives the slider to move, so that the core rod on the slider is inserted into the round tube blank, which is convenient for centering the round tube blank while preventing the round tube blank from shrinking in the stamping process.

[0014] Furthermore, a return spring mechanism is provided on the side of each slider away from the round tube blank, and the return spring mechanism includes a guide rod fixed on the slider, a spring sleeved on the guide rod, one end of the spring is fixed on the slider, and the other end of the spring is fixed on the baffle, and the baffle is fixed on the lower die seat; the spring pulls the slider away from the round tube blank. The setting of the spring mechanism facilitates the automatic reset of the slider after the round tube blank is stamped.

[0015] Furthermore, the profiling cutting assembly includes a cutting piece fixed on the second upper clamping plate and two punching heads. The cutting piece is H-shaped, and the corners of the cutting piece are provided with rounded corners. The two punching heads are symmetrically located on both sides of the crossbeam of the cutting piece. The H-shaped cutting piece can cut the round tube blank with a flat middle part into two square terminal blocks.

[0016] Furthermore, an upper pad is fixed between the first upper clamping plate and the upper die base.

[0017] Furthermore, a lower pad is fixed between the first lower mold plate, the second lower mold plate and the lower mold base.

[0018] The utility model discloses a stamping die for square wiring, which has the following beneficial effects:

[0019] The utility model utilizes a rough extrusion component and a fine extrusion component to stamp and form the middle portion of a round tube blank twice, thereby avoiding the springback of the round tube blank in the shape of an inverted isosceles trapezoid, and at the same time, the fine extrusion component improves the flatness of the middle portion of the round tube blank in the shape of an inverted isosceles trapezoid, thereby making the square end of the square terminal block flatter. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the stamping die;

[0021] Figure 2 Schematic diagram of a top view of a stamping die;

[0022] Figure 3 is a schematic side view of a rough stamping assembly;

[0023] Figure 4 It is a schematic diagram of the structure of the cut-off piece;

[0024] Figure 5 This is a schematic diagram of the structure of the square terminal block;

[0025] Figure 6 It is the side view of the square terminal block;

[0026] Figure 7 It is a round tube blank with an inverted trapezoidal shape in the middle;

[0027] Figure 8 It is a structural schematic diagram of the springback of a round tube blank after extrusion;

[0028] Among them: 1. upper die seat; 2. upper pad; 3. first upper clamping plate; 4. guide column assembly; 5. first lower template; 51. second lower template; 6. lower pad; 7. lower die seat; 8. second upper clamping plate; 9. profiling cutting assembly; 91. cutting piece; 92. punching head; 10. insert knife slider mechanism; 101. insert knife; 102. slider; 11. rough extrusion assembly; 111. first upper die forming block; 112. first lower die forming block; 12. fine extrusion assembly; 121. second upper die forming block; 122. second lower die forming block; 13. positioning mechanism; 14. reset spring mechanism; 141. guide rod; 142. baffle; 143. spring; 15. round tube blank; 16. square terminal block. DETAILED DESCRIPTION

[0029] The specific implementation methods of the utility model are described below to facilitate technical personnel in this technical field to understand the utility model, but it should be clear that the utility model is not limited to the scope of the specific implementation methods. For ordinary technical personnel in this technical field, as long as various changes are within the spirit and scope of the utility model defined and determined by the attached claims, these changes are obvious, and all utility model creations using the concept of the utility model are protected.

[0030] refer to Figure 1 to Figure 3 The present embodiment provides a stamping die for a square terminal block, including an upper die base 1, a lower die base 7, a guide column assembly 4, a rough extrusion assembly 11, a fine extrusion assembly 12, and a contour cutting assembly 9.

[0031] The upper die base 1 and the lower die base 7 are respectively arranged at the upper and lower ends of the guide column assembly 4. The guide column assembly 4 is used for guiding the upper die base 1 and the lower die base 7 when the stamping machine tool drives the stamping. The guide column assembly 4 includes four guide columns respectively connected to the four corners of the upper die base 1.

[0032] The bottom surface of the upper die base 1 is provided with adjacent first upper clamping plate 3 and second upper clamping plate 8, and an upper pad 2 is fixed between the first upper clamping plate 3 and the upper die base 1. Adjacent rough extrusion components 11 and fine extrusion components 12 are provided between the first upper clamping plate 3 and the first lower die plate 5, the rough extrusion component 11 is used to extrude the middle part of the round tube blank 15 into an inverted isosceles trapezoidal shape, and the fine extrusion component 12 is used to perform secondary extrusion on the middle part of the round tube blank 15;

[0033] The top surface of the lower die base 7 is provided with a first lower die plate 5 and a second lower die plate 51, and a lower pad 6 is fixed between the first lower die plate 5 and the second lower die plate 51 and the lower die base 7. A profiling cutting assembly 9 is provided between the second upper clamping plate 8 and the second lower die plate 51; the profiling cutting assembly 9 is used to cut the round tube blank 15 with a flat middle portion into two square terminals 16.

[0034] In this embodiment, the middle part of the round tube blank 15 is stamped and formed twice by using the rough extrusion component 11 and the fine extrusion component 12, which not only avoids the rebound of the round tube blank 15 in the shape of an inverted isosceles trapezoid, but also improves the flatness of the middle part of the round tube blank 15 in the shape of an inverted isosceles trapezoid by the fine extrusion component 12, thereby making the square end of the square terminal 16 smoother.

[0035] Among them, the rough extrusion assembly 11, the fine extrusion assembly 12 and the profiling cutting assembly 9 all include a positioning mechanism 13, each positioning mechanism 13 includes four positioning blocks, and the four positioning blocks are grouped in pairs. The two positioning blocks in each group are respectively fixedly connected to the upper die base 1 and the lower die base 7. Positioning grooves are provided on the adjacent surfaces of the two positioning blocks in each group. One end of the outer wall of the round tube blank 15 is located in the two positioning grooves, and the diameter of each positioning groove is equal to the diameter of the round tube blank 15. The setting of the positioning groove facilitates the positioning of the round tube blank 15.

[0036] Specifically, the rough extrusion assembly 11 also includes a first upper mold forming block 111 fixed on the first upper clamping plate 3 and a first lower mold forming block 112 fixed on the first lower mold plate 5, and the first upper mold forming block 111 and the first lower mold forming block 112 are both located between two positioning blocks; the bottom of the first upper mold forming block 111 is a protrusion with an inverted isosceles trapezoidal shape on the side, and the first lower mold forming block 112 is provided with a groove that cooperates with the protrusion.

[0037] Specifically, the fine extrusion assembly 12 includes a second upper mold forming block 121 fixed on the first upper clamping plate 3 and a second lower mold forming block 122 fixed on the first lower mold plate 5, and the second upper mold forming block 121 and the second lower mold forming block 122 are both located between two positioning blocks; the bottom of the second upper mold forming block 121 is a protrusion with an inverted isosceles trapezoidal shape on the side, and the second lower mold forming block 122 is provided with a groove that cooperates with the protrusion.

[0038] In this embodiment, in order to improve the processing accuracy of the second upper mold forming block 121 and the second lower mold forming block 122, the tolerances of the second upper mold forming block 121 and the second lower mold forming block 122 are made smaller than the tolerances of the first upper mold forming block 111 and the first lower mold forming block 112, thereby improving the flatness of the middle part of the circular tube in the shape of an inverted isosceles trapezoid.

[0039] As a further solution of this embodiment, refer to Figure 1 and Figure 3 The rough extrusion assembly 11 further includes two inserting knife slider mechanisms 10 symmetrically located on both sides of the first upper die forming block 111, each inserting knife slider mechanism 10 includes an inserting knife 101 and a slider 102 respectively arranged on the first upper clamping plate 3 and the first lower mold plate 5; the contact surface between the inserting knife 101 and the slider 102 is an inclined surface; two core rods for inserting into the inner tube of the round tube blank 15 are arranged on the side of the slider 102 close to the round tube blank 15; the first upper clamping plate 3 drives the inserting knife 101 to move downward, the inserting knife 101 squeezes the slider 102 to slide on the first lower mold plate 5, and the slider 102 slides along the axial direction of the round tube blank 15 so that the core rod on the slider 102 is inserted into the round tube blank 15. The inserting knife 101 drives the slider 102 to move, so that the core rod on the slider 102 is inserted into the round tube blank 15, which is convenient for centering the round tube blank 15 while preventing the round tube blank 15 from shrinking in the stamping process.

[0040] A return spring mechanism 14 is provided on the side of each slider 102 away from the round tube blank 15. The return spring mechanism 14 includes a guide rod 141 fixed on the slider 102. A spring 143 is sleeved on the guide rod 141. One end of the spring 143 is fixed on the slider 102. The other end of the spring 143 is fixed on the baffle 142. The baffle 142 is fixed on the lower die base 7. The spring 143 pulls the slider 102 away from the round tube blank 15. The arrangement of the spring 143 mechanism facilitates the automatic return of the slider 102 after the stamping of the round tube blank 15 is completed.

[0041] Specifically, refer to Figure 1 and Figure 4 The profiling cutting assembly 9 includes a cutting piece 91 fixed on the second upper clamping plate 8 and two punching heads 92. The cutting piece 91 is H-shaped, and the corners of the cutting piece 91 are provided with rounded corners. The two punching heads are symmetrically located on both sides of the crossbeam of the cutting piece 91. The setting of the H-shaped cutting piece 91 can cut the round tube blank 15 with a flat middle portion into two square terminals 16.

[0042] The working principle of this embodiment is:

[0043] The stamping die of this embodiment is fixed on the stamping machine, and the round tube blank 15 is manually placed in the rough extrusion component 11. The middle part of the round tube blank 15 is formed into an inverted trapezoidal shape after the first extrusion of the rough extrusion component 11. The round tube blank 15 with the inverted trapezoidal shape in the middle is manually placed in the fine extrusion component 12 for a second extrusion. Thereafter, the round tube blank 15 is manually placed in the profiling cutting component 9, and the round tube blank 15 is cut into two square terminal blocks 16.

[0044] Although the specific implementation of the utility model is described in detail in conjunction with the drawings, it should not be understood as limiting the scope of protection of this patent. Within the scope described in the claims, various modifications and variations that can be made by those skilled in the art without creative work still fall within the scope of protection of this patent.

Claims

1. A stamping die for a square terminal block, characterized in that: It comprises an upper die base (1) and a lower die base (7), wherein the upper die base (1) and the lower die base (7) are respectively arranged at the upper end and the lower end of the guide column assembly (4); The bottom surface of the upper die base (1) is provided with a first upper clamping plate (3) and a second upper clamping plate (8) adjacent to each other, the top surface of the lower die base (7) is provided with a first lower template (5) and a second lower template (51), and between the first upper clamping plate (3) and the first lower template (5) are provided a rough extrusion component (11) and a fine extrusion component (12) adjacent to each other, the rough extrusion component (11) being used to extrude the middle part of the round tube blank (15) into an inverted isosceles trapezoidal shape, and the fine extrusion component (12) being used to perform secondary extrusion on the middle part of the round tube blank (15); A contour cutting assembly (9) is provided between the second upper clamping plate (8) and the second lower template (51); the contour cutting assembly (9) is used to cut the round tube blank (15) with a flat middle portion into two square connection terminals (16).

2. The stamping die for the square terminal block according to claim 1, characterized in that: The rough extrusion assembly (11), the fine extrusion assembly (12) and the profiling cutting assembly (9) all include positioning mechanisms (13), each of the positioning mechanisms (13) includes four positioning blocks, the four positioning blocks are grouped in pairs, the two positioning blocks in each group are respectively fixedly connected to the upper die base (1) and the lower die base (7), and positioning grooves are provided on adjacent surfaces of the two positioning blocks in each group, and one end of the outer wall of the circular tube blank (15) is located in the two positioning grooves.

3. The stamping die for the square terminal block according to claim 2, characterized in that: The diameter of each positioning groove is equal to the diameter of the round tube blank (15).

4. The stamping die for the square terminal block according to claim 2, characterized in that: The rough extrusion assembly (11) comprises a first upper die forming block (111) fixed on the first upper clamping plate (3) and a first lower die forming block (112) fixed on the first lower mold plate (5), wherein the first upper die forming block (111) and the first lower die forming block (112) are both located between the two positioning blocks; The bottom of the first upper mold forming block (111) is a protrusion in the shape of an inverted isosceles trapezoid, and the first lower mold forming block (112) is provided with a groove matching the protrusion.

5. The stamping die for the square terminal block according to claim 4, characterized in that: The fine extrusion assembly (12) comprises a second upper die forming block (121) fixed on the first upper clamping plate (3) and a second lower die forming block (122) fixed on the first lower mold plate (5), wherein the second upper die forming block (121) and the second lower die forming block (122) are both located between the two positioning blocks; The bottom of the second upper mold forming block (121) is a protrusion in the shape of an inverted isosceles trapezoid, and the second lower mold forming block (122) is provided with a groove matching the protrusion; The tolerances of the second upper mold forming block (121) and the second lower mold forming block (122) are both smaller than the tolerances of the first upper mold forming block (111) and the first lower mold forming block (112).

6. The stamping die for the square terminal according to claim 4, characterized in that: The rough extrusion assembly (11) further comprises two inserting knife slider mechanisms (10) symmetrically located on both sides of the first upper die forming block (111), each of the inserting knife slider mechanisms (10) comprising an inserting knife (101) and a slider (102) respectively arranged on the first upper clamping plate (3) and the first lower die plate (5); the contact surface between the inserting knife (101) and the slider (102) is an inclined surface; and two core rods for inserting into the inner tube of the round tube blank (15) are arranged on a surface of the slider (102) close to the round tube blank (15); The first upper clamping plate (3) drives the inserting knife (101) to move downward, and the inserting knife (101) presses the sliding block (102) to slide on the first lower template (5), and the sliding block (102) slides along the axial direction of the round tube blank (15) so that the core rod thereon is inserted into the round tube blank (15).

7. The stamping die for the square terminal according to claim 6, characterized in that: A return spring mechanism (14) is provided on a surface of each slider (102) away from the round tube blank (15), the return spring mechanism (14) comprising a guide rod (141) fixed on the slider (102), a spring (143) sleeved on the guide rod (141), one end of the spring (143) fixed on the slider (102), the other end of the spring (143) fixed on the baffle (142), and the baffle (142) fixed on the lower die base (7); the spring (143) pulls the slider (102) away from the round tube blank (15).

8. The stamping die for the square terminal block according to claim 2, characterized in that: The profiling cutting assembly (9) comprises a cutting piece (91) fixed on the second upper clamping plate (8) and two punching heads (92); the cutting piece (91) is H-shaped, and the corners of the cutting piece (91) are provided with rounded corners; the two punching heads are symmetrically located on both sides of the crossbeam of the cutting piece (91).

9. The stamping die for the square terminal block according to claim 2, characterized in that: An upper pad (2) is fixed between the first upper clamping plate (3) and the upper die seat (1).

10. The stamping die for the square terminal according to claim 2, characterized in that: A lower pad (6) is fixed between the first lower mold plate (5), the second lower mold plate (51) and the lower mold base (7).

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