A stamping die for shaving gears and its stamping forming process

Abstract

The present invention relates to a stamping die for scraping teeth and its stamping forming process, which includes an upper die and a lower die. Along the advancing direction of the strip, a punching station and a scraping tooth station are sequentially arranged on the die. The scraping tooth station includes a scraping tooth slider and a positioning block. The positioning block is arranged in the lower die, and an upward protruding positioning portion 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 advancement of the strip. The scraping tooth slider is arranged in the upper die and slides horizontally. A scraping knife is arranged at the bottom of the scraping tooth slider. A pushing block is also arranged in the upper die, and a pushing inclined surface is formed at the lower end of the pushing block. A scraping tooth inclined surface adapted to the pushing inclined surface is formed at the rear upper part of the scraping tooth slider. The pushing block cooperates with the scraping tooth inclined surface through the pushing inclined surface to push the scraping tooth slider forward. At the scraping tooth station, the scraping tooth is scraped out horizontally by the scraping tooth slider, which can ensure that the tip of the puncturing tooth scraped out is sharp enough to facilitate puncturing the paint layer covered on the enameled wire of the terminal.

Description

Technical Field

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

[0002] For the connection between the motor lead wire and the enameled wire, the enamel on the outer layer of the enameled wire mainly plays the role of anti-corrosion and anti-oxidation in the working environment. The enameled wire is usually de-enameled by mechanical, manual or chemical means, and then the de-enameled enameled wire and the lead wire are connected by welding. This traditional connection process not only has low efficiency, but also is extremely prone to problems such as poor soldering, and the de-enameled part cannot achieve good sealing, etc. The copper wire in the enamel is extremely vulnerable to corrosion and oxidation, damaging the performance of the motor and affecting the use of the product.

[0003] The piercing terminal is a terminal with trapezoidal tooth grooves transversely arranged on the inner surface. Piercing teeth are formed on both sides of the trapezoidal tooth grooves. When in use, the enameled wire and the lead wire are placed in the terminal and pressed tightly by a press. The transversely arranged piercing teeth pierce the enamel layer of the enameled wire, so that the enameled wire and the lead wire are connected and conducted.

[0004] The piercing terminal is usually formed by stamping. The piercing teeth on the piercing terminal formed by vertical stamping are usually not sharp enough and are not easy to pierce the enamel skin on the enameled wire. Summary of the Invention

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

[0006] To achieve the above object, the present invention is a stamping die for scraping teeth, including an upper die and a lower die. Along the advancing direction of the strip, a punching station and a scraping tooth station are sequentially arranged on the die. An punching rod is arranged at the punching station on the upper die, and an punching seat is arranged at the punching station on the lower die. The punching rod moves up and down in the upper die, and the lower end of the punching rod enters and exits in the punching seat. A positioning hole is formed on the strip by punching with the punching rod. The scraping tooth station includes a scraping tooth slider and a positioning block. The positioning block is arranged in the lower die, and 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, and the positioning portion can extend into the positioning hole formed by the punching station to block the advancement of the strip. The scraping tooth slider is arranged in the upper die and slides horizontally. A scraping knife is arranged at the bottom of the scraping tooth slider. A pushing block is also arranged in the upper die and moves up and down in the upper die. A pushing inclined surface is formed at the lower end of the pushing block. A scraping tooth inclined surface adapted to the pushing inclined surface is formed at the rear upper part of the scraping tooth slider. The pushing block pushes the scraping tooth slider forward by the cooperation of the pushing inclined surface and the scraping tooth inclined surface.

[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:

[0012] (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;

[0013] (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;

[0014] (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;

[0015] (4) The positioning block moves downward to release the positioning of the material strip, and the scraper slider moves backward to reset.

[0016] The purpose of the invention is to process a plurality of sections of sharp piercing teeth on a material strip.

[0017] 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

[0018] Figure 1 This is a diagram of piercing the terminal.

[0019] Figure 2 It is a planar development view of the piercing terminal.

[0020] Figure 3 It is a top view of the strip in the forming process of the present invention.

[0021] Figure 4 It is a schematic of an embodiment of the present invention Figure 1 .

[0022] Figure 5 It is a schematic of an embodiment of the present invention Figure 2 .

[0023] Figure 6 It is a top view of the embodiment of the present invention with the upper die removed.

[0024] Figure 7 It is Figure 4 an enlarged view of part A.

[0025] Figure 8 It is Figure 4 an enlarged view of part B.

[0026] Figure 9 It is Figure 5 an enlarged view of part C.

[0027] Figure 10 It is Figure 5 an enlarged view of part D.

[0028] Figure 11 It is a side view of the scraper in the specific embodiment.

[0029] Figure 12 It is Figure 11 a sectional view taken along line A - A.

[0030] Figure 13 It is a front view of the scraper in the specific embodiment.

[0031] Figure 14 It is a partial schematic diagram of the positioning block in the specific embodiment.

[0032] Figure 15 It is a schematic cross - sectional view of the strip. Detailed implementation manner

[0033] As Figure 1 and Figure 2 shown, the piercing terminal 10 to be processed and formed in the specific embodiment of the present invention is a terminal with trapezoidal tooth grooves 92 horizontally arranged on the inner surface. Piercing teeth 93 are formed on both sides of the trapezoidal tooth grooves 92. When in use, the enameled wire and the lead wire are placed in the terminal and pressed by a press. The horizontally arranged piercing teeth 93 pierce the enamel layer of the enameled wire, so that the enameled wire and the lead wire are connected and conducted.

[0034] As Figure 3 shown, the objective of the specific embodiment of the present invention is to process sharp piercing teeth 93 on the strip 9.

[0035] As Figures 4 - 14 shown, in the specific embodiment of the present invention, the advancing direction of the strip is defined as the front. The specific embodiment of the present invention is a stamping die for scraping teeth, including an upper die 1 and a lower die 2. A strip 9 is arranged between the upper die 1 and the lower die 2. An punching station and a scraping tooth station are sequentially arranged on the die along the advancing direction of the strip 9. An punching rod 3 is arranged at the punching station on the upper die 1, and an punching seat 4 is arranged at the punching station on the lower die 2. The punching rod 3 moves up and down in the upper die 1. 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 enters and exits in the punching seat hole 41 of the punching seat 4. A positioning hole 91 is formed on the strip 9 by punching with the punching rod 3. The scraping tooth station includes a scraping tooth slider 5 and a positioning block 6. The positioning block 6 moves up and down in the lower die 2. 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 advancement of the strip 9. The scraping tooth slider 5 slides horizontally in the upper die 1. A scraping knife 51 is arranged in the scraping tooth slider 5. A pushing block 7 is further arranged in the upper die 1. The pushing block 7 moves up and down in the upper die 1. A pushing inclined surface 71 is formed at the lower end of the pushing block 7. A scraping tooth inclined surface 52 adapted to the pushing inclined surface 71 is formed at the rear upper part of the scraping tooth slider 5. The pushing block 7 pushes the scraping tooth slider 5 to move forward through the cooperation of the pushing inclined surface 71 and the scraping tooth inclined surface 52.

[0036] A spring groove 53 opening towards the front end is formed on the scraping tooth slider 5. A guiding shaft 54 is penetrated through the center of the spring groove 53. Both ends of the guiding shaft 54 are connected to the upper die 1. A return spring 55 is sleeved on the guiding shaft 54 in the spring groove 53. The return spring 55 can reset the scraping tooth slider 5.

[0037] A stop pin 8 is arranged on the lower die 2 at the rear end of the scraping tooth slider 5. The stop pin 8 can limit the retraction distance of the scraping tooth slider 5.

[0038] The scraping knife 51 on the scraping tooth slider 5 includes an integrally formed blade portion 511 and a tip portion 512. The 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 tip portion 512 is formed by gradually narrowing from the front end of the blade portion 511 towards the front end. The cross-section of the front end of the tip portion 512 is an inverted triangle. When scraping teeth, a groove can be conveniently cut out on the strip 9 by the tip portion 512 and the groove is gradually enlarged, and then the strip 9 in the groove is extruded and turned outwards by the blade portion 511 to form sharp scraping teeth. A relief groove 56 is formed at the rear end of the scraping tooth slider 5 for the scraping knife. The relief groove 56 provides a relief space for the upward scraping teeth pushed by the scraping knife.

[0039] An embodiment of the present invention further includes a scraping tooth stamping forming process using the above-mentioned scraping tooth stamping die, and the steps are as follows:

[0040] (1) As shown in Figure 7 and Figure 9 , the strip 9 moves forward between the upper die 1 and the lower die 2. At the punching station, the punching rod 3 moves downward through the strip 9 and extends into the punching seat 4 to punch a positioning hole 91 in the strip.

[0041] (2) As shown in Figure 8 , the strip 9 continues to move forward. When the positioning hole 91 punched at the punching station reaches above the positioning block 6 at the scraping tooth station, the positioning block 6 moves upward and inserts the positioning portion 61 into the positioning hole 91 to position the strip 9.

[0042] (3) As shown in Figure 10 , the pushing block 7 moves downward to push the scraping tooth slider 5 forward, and a trapezoidal tooth groove 92 is scraped on the strip 9 through the scraping knife 51 on the scraping tooth slider 5. The surplus material in the trapezoidal tooth groove 92 turns outwards to form a piercing tooth 93.

[0043] (4) The positioning block 6 moves downward to release the positioning of the strip 9, and at the same time, the scraping tooth slider 5 retracts and resets.

[0044] The cross-section of the scraping tooth formed by the present invention is as shown in Figure 15 . A trapezoidal tooth groove 92 and a piercing tooth 93 are formed on the upper surface 90 of the strip 9. The trapezoidal tooth grooves 92 are equidistantly arranged on the upper surface 90 of the strip and are scraped out by the cutting edge portion 511 of the scraping knife 51. The piercing teeth 93 are arranged at both ends of the trapezoidal tooth groove 92, and the piercing teeth 93 are composed of the material extruded from the trapezoidal tooth groove 92.

[0045] The above embodiments are the preferred embodiments 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 pushing inclined surface and the scraping inclined surface. The scraper includes an integrally formed blade portion and a blade tip portion. The blade tip portion is arranged at the front end of the blade portion. The cross section of the blade portion is an inverted trapezoid. The blade tip portion is formed by gradually reducing the front end of the blade portion toward the front end. The cross section of the front end of the blade tip portion is an inverted triangle.

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 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.

5. A scraping stamping process using the scraping stamping die according to any one of claims 1 to 4, 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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