Stamping die for scraping teeth and stamping forming process of stamping die

Abstract

The stamping die comprises an upper die body and a lower die body, a punching station and a tooth scraping station are sequentially arranged on the die body in the advancing direction of a material belt, the tooth scraping station comprises a tooth scraping sliding block and a positioning block, the positioning block is arranged in the lower die body, a positioning part protruding upwards is formed on the positioning block, and the positioning part is arranged on the upper die body. The upper surface of the positioning part is smaller than the bottom surface of the punching rod, the positioning part can extend into a positioning hole formed in a punching station to prevent a material belt from advancing, the scraping tooth sliding block is arranged in the upper die and transversely slides, a scraper is arranged at the bottom of the scraping tooth sliding block, a pushing block is further arranged in the upper die, and a pushing inclined plane is formed at the lower end of the pushing block. The rear upper portion of the scraping tooth sliding block forms a scraping tooth inclined plane matched with the pushing inclined plane, the pushing block pushes the scraping tooth sliding block to move forwards through cooperation of the pushing inclined plane and the scraping tooth inclined plane, scraping teeth are transversely scraped through the scraping tooth sliding block at the scraping tooth station, it can be guaranteed that the sharp ends of the scraped puncturing teeth are sharp enough, and the puncturing terminal can puncture a paint layer covering an enameled wire conveniently.

Description

Technical Field

[0001] The invention relates to a stamping die, in particular to a stamping die for forming scraping teeth for piercing terminals and a stamping forming process thereof. Background Art

[0002] The connection between the motor lead wire and the enameled wire, the paint on the outer layer of the enameled wire mainly plays the role of corrosion and oxidation resistance in the working environment. The enameled wire is usually depainted mechanically, manually or chemically, and then the depainted enameled wire and the lead wire are connected by welding. This traditional connection process is not only inefficient, but also prone to cold welding, and the depainted part cannot achieve good sealing and other problems. The copper wire in the paint is easily corroded and oxidized, which damages the motor performance and affects the use of the product.

[0003] The piercing terminal is a terminal with trapezoidal teeth arranged horizontally on the inner surface. Piercing teeth are formed on both sides of the trapezoidal teeth. When in use, the enameled wire and the lead are placed in the terminal and pressed by a crimping machine. The horizontally arranged piercing teeth pierce the paint layer of the enameled wire, thereby connecting the enameled wire and the lead.

[0004] The piercing terminals are usually formed by stamping. The piercing teeth on the vertically stamped piercing terminals are usually not sharp enough to pierce the paint on the enameled wire. Summary of the invention

[0005] In order to solve the deficiencies in the prior art, the present invention provides a stamping die for skiving teeth and a stamping forming process thereof.

[0006] In order to achieve the above-mentioned purpose, the present invention is a stamping die for scraping teeth, comprising an upper die and a lower die. A punching station and a scraping tooth station are sequentially arranged on the die along the advancing direction of the material strip. The upper die is provided with a punching rod at the punching station, and the lower die is provided with a punching seat at the punching station. The punching rod moves up and down in the upper die, and the lower end of the punching rod moves in and out of the punching seat. A positioning hole is formed by punching the material strip through the punching rod. The scraping tooth station comprises a scraping tooth slider and a positioning block. The positioning block is arranged in the lower die, and a positioning block is formed on the positioning block. A positioning part protrudes upward, and the upper surface of the positioning part is smaller than the bottom surface of the punching rod. The positioning part can be extended into the positioning hole formed by the punching station to block the material strip from moving forward. The scraping slider is arranged in the upper mold for horizontal sliding. A scraper is arranged at the bottom of the scraping slider. A pushing block is also arranged in the upper mold. The pushing block moves up and down in the upper mold. A pushing slope is formed at the lower end of the pushing block. A scraping slope adapted to the pushing slope is formed on the rear upper part of the scraping slider. The pushing block pushes the scraping slider forward by cooperating with the scraping slope through the pushing slope.

[0007] The center of the scraper slider in the present invention forms a spring groove open toward the front end, the center of the spring groove is penetrated by a guide shaft, both ends of the guide shaft are connected to the upper mold, and a reset spring is sleeved on the guide shaft in the spring groove, and the reset spring can reset the scraper slider.

[0008] The rear end of the scraping slider in the present invention is provided with a stop pin on the lower die, and the stop pin can limit the retreat distance of the scraping slider.

[0009] The scraper described in the present invention includes an integrally formed blade portion and a tip portion, the tip portion is arranged at the front end of the blade portion, the cross-section of the blade portion is an inverted trapezoid, the tip portion is formed by gradually narrowing from the front end of the blade portion to the front end, and the cross-section of the front end of the tip portion is an inverted triangle. When scraping, the tip portion can conveniently cut a groove in the material strip and gradually expand the groove, and then the blade portion squeezes the material strip in the groove outward to form sharp scraping teeth, which is significantly different from the traditional vertical stamping scraping teeth in sharpness.

[0010] The scraping tooth sliding block of the present invention forms a clearance groove at the rear end of the scraper, and the clearance groove provides a clearance space for the upward scraping teeth formed by the pushing of the scraper.

[0011] The present invention also includes a scraping stamping process using the above-mentioned scraping stamping die, and the steps are as follows: (1) The material strip moves toward the front end between the upper die and the lower die, and the punching rod moves downward through the material strip and extends into the punching seat at the punching station to punch a positioning hole on the material strip; (2) The material strip continues to move forward. When the positioning hole punched by the punching station reaches above the positioning block of the gear scraping station, the positioning block moves upward to insert the positioning part into the positioning hole to position the material strip; (3) The push block moves downward to push the scraper slider forward, and the scraper on the scraper slider scrapes out trapezoidal tooth grooves on the material belt, and the remaining material in the trapezoidal tooth grooves turns outward to form piercing teeth; (4) The positioning block moves downward to release the positioning of the material strip, and the scraper slider moves backward to reset.

[0012] The purpose of the invention is to process a plurality of sections of sharp piercing teeth on a material strip.

[0013] The beneficial effect of the present invention is that the piercing teeth are scraped out laterally by the scraping slider at the scraping station, which can ensure that the tips of the scraped piercing teeth are sharp enough to facilitate piercing the terminal and the paint layer covering the enameled wire, thereby ensuring the conductive performance of the connection with the enameled wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a diagram of piercing the terminal.

[0015] Figure 2 This is a plan view of the pierced terminal.

[0016] Figure 3 It is a top view of the material strip in the molding process of the present invention.

[0017] Figure 4 This is a schematic diagram of an embodiment of the present invention. Figure 1 .

[0018] Figure 5 This is a schematic diagram of an embodiment of the present invention. Figure 2 .

[0019] Figure 6 It is a top view of an embodiment of the present invention with the upper mold removed.

[0020] Figure 7 yes Figure 4 Enlarged view of part A.

[0021] Figure 8 yes Figure 4 Enlarged view of part B.

[0022] Fig. 9 yes Figure 5 Enlarged view of part C.

[0023] Fig.10 yes Figure 5 Enlarged view of part D.

[0024] Fig.11 is a side view of a scraper in a specific embodiment.

[0025] Fig.12 yes Fig.11 AA section view.

[0026] Fig.13 It is a front view of the scraper in a specific embodiment.

[0027] Fig.14 It is a partial schematic diagram of the positioning block in a specific embodiment.

[0028] Fig.15 It is a schematic diagram of the cross section of the material strip. DETAILED DESCRIPTION

[0029] like Figure 1 and Figure 2 As shown, the piercing terminal 10 to be processed and formed in the specific embodiment of the present invention is a terminal with a trapezoidal tooth groove 92 transversely arranged on the inner surface, and piercing teeth 93 are formed on both sides of the trapezoidal tooth groove 92. When in use, the enameled wire and the lead wire are placed in the terminal, and the terminal is pressed by a crimping machine. The transversely arranged piercing teeth 93 pierce the paint layer of the enameled wire, thereby connecting the enameled wire and the lead wire.

[0030] like Figure 3As shown, the purpose of the specific embodiment of the present invention is to process sharp piercing teeth 93 on the material strip 9.

[0031] like Figure 4-Figure 14 As shown, in a specific embodiment of the present invention, the forward direction of the material strip is defined as the front. A specific embodiment of the present invention is a stamping die for scraping teeth, comprising an upper die 1 and a lower die 2. A material strip 9 is arranged between the upper die 1 and the lower die 2. A punching station and a scraping tooth station are sequentially arranged on the die along the forward direction of the material strip 9. The upper die 1 is provided with a punching rod 3 at the punching station, and the lower die 2 is provided with a punching seat 4 at the punching station. The punching rod 3 moves up and down in the upper die 1, and a punching seat hole 41 corresponding to the punching rod 3 is formed in the center of the punching seat 4. The lower end of the punching rod 3 moves in and out of the punching seat hole 41 of the punching seat 4, and a positioning hole 91 is formed on the material strip 9 by punching the punching rod 3. The scraping tooth station comprises a scraping tooth slider 5. Positioning block 6. The positioning block 6 is arranged in the lower mold 2 and moves up and down. A positioning portion 61 protruding upward is formed on the positioning block 6. The upper surface of the positioning portion 61 is smaller than the bottom surface of the punching rod 3. The positioning portion 61 can extend into the positioning hole 91 formed by the punching station to block the material strip 9 from moving forward. The scraping slider 5 is arranged in the upper mold 1 and slides laterally. A scraper 51 is arranged in the scraping slider 5. A push block 7 is also arranged in the upper mold 1. The push block 7 moves up and down in the upper mold 1. A push slope 71 is formed at the lower end of the push block 7. A scraping slope 52 adapted to the push slope 71 is formed at the rear upper part of the scraping slider 5. The push block 7 pushes the scraping slider 5 forward by cooperating with the scraping slope 52 through the push slope 71.

[0032] A spring groove 53 open toward the front end is formed on the scraper slider 5, a guide shaft 54 ​​is passed through the center of the spring groove 53, both ends of the guide shaft 54 ​​are connected to the upper mold 1, and a reset spring 55 is sleeved on the guide shaft 54 ​​in the spring groove 53, and the reset spring 55 can reset the scraper slider 5.

[0033] A stop pin 8 is provided at the rear end of the scraping slider 5 on the lower die 2 , and the stop pin 8 can limit the retreat distance of the scraping slider 5 .

[0034] The scraper 51 on the scraper slider 5 includes an integrally formed blade portion 511 and a blade tip portion 512. The blade tip portion 512 is arranged at the front end of the blade portion 511. The cross section of the blade portion 511 is an inverted trapezoid. The blade tip portion 512 is formed by gradually narrowing the front end of the blade portion 511 toward the front end. The cross section of the front end of the blade tip portion 512 is an inverted triangle. When scraping, the blade tip portion 512 can conveniently cut a groove in the material strip 9 and gradually expand the groove. Then, the blade portion 511 squeezes the material strip 9 in the groove outward to form sharp scraping teeth. The scraper slider 5 forms a clearance groove 56 at the rear end of the scraper. The clearance groove 56 provides clearance space for the upward scraping teeth formed by the scraper pushing.

[0035] The embodiment of the present invention also includes a scraping stamping process using the above-mentioned scraping stamping die, and the steps are as follows: (1) If Figure 7 and Fig. 9 As shown, the material strip 9 moves toward the front end between the upper die 1 and the lower die 2, and the punching rod 3 moves downward through the material strip 9 and extends into the punching seat 4 at the punching station, punching holes 91 on the material strip; (2) If Figure 8 As shown, the material strip 9 continues to move forward, and when the positioning hole 91 punched by the punching station reaches above the positioning block 6 of the gear-scraping station, the positioning block 6 moves upward to insert the positioning portion 61 into the positioning hole 91 to position the material strip 9; (3) If Fig.10 The push block 7 moves downward to push the scraper slider 5 forward, and the scraper 51 on the scraper slider 5 scrapes trapezoidal tooth grooves 92 on the material strip 9, and the remaining material in the trapezoidal tooth grooves 92 turns outward to form piercing teeth 93; (4) The positioning block 6 moves downward to release the positioning of the material strip 9, and at the same time, the scraper slider 5 moves backward and resets.

[0036] The cross section of the scraping teeth formed by the present invention is as follows: Fig.15 As shown, trapezoidal tooth grooves 92 and piercing teeth 93 are formed on the upper surface 90 of the material strip 9. The trapezoidal tooth grooves 92 are equidistantly arranged on the upper surface 90 of the material strip and are scraped out by the blade portion 511 of the scraper 51. The piercing teeth 93 are arranged at both ends of the trapezoidal tooth grooves 92. The piercing teeth 93 are composed of the material extruded from the trapezoidal tooth grooves 92.

[0037] The above embodiments are preferred implementations of the present invention, and other obvious improvements are within the protection scope of the present invention.

Claims

1. A stamping die for scraping gears, comprising an upper die and a lower die, wherein a punching station and a scraping gear station are sequentially arranged on the die along the advancing direction of the material strip, the upper die is provided with a punching rod at the punching station, and the lower die is provided with a punching seat at the punching station, the punching rod moves up and down in the upper die, and the lower end of the punching rod moves in and out of the punching seat, and a positioning hole is formed by punching the material strip through the punching rod, characterized in that: The scraping station includes a scraping slider and a positioning block. The positioning block is arranged in the lower die. A positioning portion protruding upward is formed on the positioning block. The upper surface of the positioning portion is smaller than the bottom surface of the punching rod. The positioning portion can extend into the positioning hole formed by the punching station to block the material strip from moving forward. The scraping slider is arranged in the upper die for lateral sliding. A scraper is arranged at the bottom of the scraping slider. A pushing block is also arranged in the upper die. The pushing block moves up and down in the upper die. A pushing inclined surface is formed at the lower end of the pushing block. A scraping inclined surface adapted to the pushing inclined surface is formed at the rear upper part of the scraping slider. The pushing block pushes the scraping slider forward by cooperating with the scraping inclined surface through the pushing inclined surface.

2. The stamping die for skiving according to claim 1, characterized in that: A spring groove is formed at the center of the scraping slider and is open toward the front end. A guide shaft is passed through the center of the spring groove. Both ends of the guide shaft are connected to the upper mold. A reset spring is sleeved on the guide shaft in the spring groove.

3. The stamping die for skiving according to claim 2, characterized in that: The rear end of the scraping slider is provided with a stop pin on the lower die.

4. The stamping die for skiving according to claim 1, 2 or 3, characterized in that: The scraper includes an integrally formed blade portion and a tip portion, the tip portion is arranged at the front end of the blade portion, the cross section of the blade portion is an inverted trapezoid, the tip portion is formed by gradually narrowing from the front end of the blade portion to the front end, and the cross section of the front end of the tip portion is an inverted triangle.

5. The stamping die for skiving according to claim 4, characterized in that: The scraping tooth slider forms a clearance groove at the rear end of the scraper, and the clearance groove provides a clearance space for the upward scraping teeth formed by the scraper pushing.

6. A scraping stamping process using the scraping stamping die according to any one of claims 1 to 5, the steps of which are as follows: (1) The material strip moves toward the front end between the upper die and the lower die, and the punching rod moves downward through the material strip and extends into the punching seat at the punching station to punch a positioning hole on the material strip; (2) The material strip continues to move forward. When the positioning hole punched by the punching station reaches above the positioning block of the gear scraping station, the positioning block moves upward to insert the positioning part into the positioning hole to position the material strip; (3) The push block moves downward to push the scraper slider forward, and the scraper on the scraper slider scrapes out trapezoidal tooth grooves on the material belt, and the remaining material in the trapezoidal tooth grooves turns outward to form piercing teeth; (4) The positioning block moves downward to release the positioning of the material strip, and the scraper slider moves backward to reset.

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