Bounce initiator start cup lock step press tooling

Abstract

In order to solve the problems of high labor intensity, low production efficiency and safety hidden danger existing in the production mode of the existing backflush starter starting cup, the present application provides a backflush starter starting cup locking step stamping tool, which comprises a bottom die, a fixed stamping component and a stamping head; the bottom die is arranged on the base plate of the punch bench workbench surface and comprises an inner column and a bottom disc; the fixed stamping component is fixedly installed on the piston of the outer cylinder of the punch head of the stamping machine; it comprises an inner positioning ring, an outer positioning ring, a sliding punch, a return spring and an adjusting bolt; the stamping head is fixedly installed on the piston of the inner cylinder of the punch head of the stamping machine and is in the form of a ring-shaped column, the inner diameter of which matches the outer diameter of the inner positioning ring, and the outer diameter of which matches the inner diameter of the outer positioning ring. The beneficial technical effects of the present application are that six transverse locking steps are stamped at one time, the production efficiency is effectively improved, the labor intensity is reduced, and the safety hidden danger is reduced.

Description

Technical Field

[0001] The invention relates to a production technology of a small or micro gasoline and diesel engine recoil starter, in particular to a recoil starter starting cup locking step stamping tool. Background Art

[0002] A recoil starter is a key component in small or micro gasoline and diesel engines. Its function is to rapidly rotate the engine's flywheel by quickly pulling the recoil starter's cord, thereby driving the engine's crankshaft. For diesel engines, the rapid rotation of the flywheel causes the compression ratio within the engine cylinder to reach the diesel detonation point, enabling detonation of the diesel within the cylinder and normal operation of the diesel engine. For gasoline engines, the rapid rotation of the flywheel simultaneously activates the ignition device, enabling normal operation of the gasoline engine. Typically, a recoil starter comprises a disc, a housing, a rotating shaft, and a starter cup. The rotating shaft is fixedly connected to the center of the housing. The disc is mounted on the rotating shaft and can rotate along the shaft. The starter cup is fixedly connected to the end of the rotating shaft. A cable groove for winding the cable is provided on the outer side of the disc, and a coil spring is located in the middle of the disc. When the recoil starter's cord is pulled, the disc rotates. Simultaneously, a pawl on the rotating shaft extends and engages a step on the disc, causing the disc and shaft to rotate together. The starter cup fixedly connected to the end of the rotating shaft also rotates with the rotating shaft. A number of locking steps are provided on the outer circumference of the starter cup, and corresponding to the locking steps, a number of retractable ratchets are also provided on the end of the flywheel shaft. When the starter cup rotates to the set angle, the retractable ratchets enter the locking steps on the outer circumference of the starter cup, thereby forming a locked state, causing the flywheel and the starter cup to rotate together, thereby igniting and starting the engine. It should be noted that the locking steps on the outer circumference of the starter cup are similar to ratchets. When the starter cup rotates in the forward direction (that is, when the rotation speed of the starter cup is greater than the rotation speed of the flywheel shaft), the retractable ratchets on the flywheel shaft and the locking steps can form a locked state; when the starter cup rotates in the reverse direction (that is, when the rotation speed of the starter cup is less than the rotation speed of the flywheel shaft), the retractable ratchets on the flywheel shaft and the locking steps cannot form a locked state. The starter is a metal stamping part with triangularly distributed through holes on the upper surface, locking steps on the outer circumference, and a special-shaped flange on the bottom. Since its appearance is similar to that of an ordinary water cup (see attached Figure 1 、 2, 3, in the figure, a is the start cup, b is the locking step), therefore, it is called the start cup. In the production of the start cup of the prior art recoil starter, the locking steps on the outer circumference of the start cup are produced by stamping one by one, that is, the start cup is placed horizontally at the set position under the punch, and the punch is a rectangular parallelepiped with an inclined surface. When the punch is pressed down, a locking step with an oblique tooth-shaped cross section is pressed out on the outer circumference of the start cup. Since the stamping process requires continuous adjustment of the stamping position, most of the operations are done manually. And stamping a start cup requires six rotations, which is not only labor-intensive and has low production efficiency, but also poses a safety hazard.

[0003] Obviously, the existing production method of the recoil starter starter cup has problems such as high labor intensity, low production efficiency and potential safety hazards. Summary of the Invention

[0004] In order to solve the problems of high labor intensity, low production efficiency and potential safety hazards in the production method of the recoil starter starting cup in the prior art, the present invention proposes a recoil starter starting cup locking step stamping tool.

[0005] The punching tooling for the locking step of the recoil starter cup of the present invention comprises a bottom die, a fixed punching assembly and a punching head; the bottom die is arranged on a base plate on the work surface of the punch press, and comprises an inner column and a bottom plate; the inner column is a cylinder, and its diameter and length match the inner space of the starter cup; a boss matching the through hole on the top surface of the starter cup is provided on the upper surface of the inner column, and triangular notches are provided on the circumference of the inner column, the number, shape and size of which are the same as the outer edge of the cross-sectional shape of the locking step of the starter cup and pass through the entire axial direction of the inner column; the bottom plate is fixedly connected to the bottom of the inner column, and a groove matching the special-shaped flange at the bottom of the starter cup is provided on the upper surface of the bottom plate; The fixed stamping part is fixedly mounted on the piston of the outer cylinder of the punch on the stamping machine; it includes an inner positioning ring, an outer positioning ring, a sliding punch, a return spring and an adjusting bolt; the inner positioning ring is an annular cylinder, the inner diameter of which matches the outer diameter of the starting cup, and the height is higher than the starting cup; a rectangular guide hole with the same size as the radial shape of the locking step of the starting cup is provided at a set position on the circumference of the inner positioning ring, the set position of the rectangular guide hole is the position corresponding to the locking step after the starting cup is placed on the bottom die, and the number of the guide holes is the same as the number of locking steps on the starting cup; the sliding punch is an elongated strip, and the front end is a rectangular cross-sectional shape. The punch has a shape of a circle, and the rear end is a guide rod with a circular cross-section; an oblique punching port is provided on the front end face of the punch, and an outer arc-shaped inclined surface inclined outward from top to bottom is provided on the rear end face of the punch; the front end of the guide rod is fixedly connected to the rear end of the punch, and the rear end is provided with an adjusting thread; the outer positioning ring is an annular cylinder, which is sleeved on the outside of the inner positioning ring; a circular through hole is provided on the circumference of the outer positioning ring, through which the punch guide rod passes, and the setting position and size of the circular through hole correspond to the position and size of the punch guide rod after the punch is sleeved in the rectangular guide hole of the inner positioning ring; the number of the circular through holes is the same as the number of the sliding punch; the reset spring is sleeved on the protruding On the guide rod of the sliding punch outside the outer locating ring; the adjusting bolt is screwed onto the adjusting thread at the end of the sliding punch guide rod; the punching head is fixedly mounted on the piston of the cylinder inside the punch on the punching machine, and is an annular cylindrical structure, whose inner circle diameter matches the outer circle diameter of the inner locating ring, and its outer circle diameter matches the inner circle diameter of the outer locating ring; an opening groove is provided at the bottom end of the punching head to avoid the sliding punch guide rod, and the size, position and number of the opening groove match the sliding punch guide rod; an inner arc-shaped inclined surface inclined outward from top to bottom is provided on the inner side surface of the bottom end of the punching head, and its inclination curvature is the same as the outer arc-shaped inclined surface at the rear end of the sliding punch punch.

[0006] Furthermore, fixed punching assembly guide columns evenly distributed around the circumference are provided on the base plate of the punching machine work surface, and fixed punching assembly guide holes are provided at corresponding positions on the circumference of the fixed punching assembly outer positioning ring.

[0007] Furthermore, punch head guide columns evenly distributed around the circumference are provided between the inner positioning ring and the outer positioning ring of the fixed punch assembly, and punch head guide holes are provided at corresponding positions on the circumference of the punch head.

[0008] The beneficial technical effect of the punching tool for the recoil starter starting cup locking step of the present invention is that six horizontal locking steps can be punched out at one time, which effectively improves production efficiency, reduces labor intensity, and reduces safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Attachment Figure 1 A three-dimensional schematic diagram of a recoil starter starter cup;

[0010] Attachment Figure 2 A 3D diagram of the recoil starter cup from another angle

[0011] Attachment Figure 3 It is a cross-sectional schematic diagram of the recoil starter starting cup;

[0012] Attachment Figure 4 A three-dimensional schematic diagram of a punching tool for a locking step of a starting cup of a recoil starter according to the present invention;

[0013] Attachment Figure 5 3D schematic diagram of the bottom mold of the present invention;

[0014] Attachment Figure 6 A three-dimensional schematic diagram of a fixed stamping assembly of the present invention;

[0015] Attachment Figure 7 An exploded three-dimensional schematic diagram of a fixed stamping assembly of the present invention;

[0016] Attachment Figure 8 3D schematic diagram and cross-sectional schematic diagram of the punch head of the present invention;

[0017] Attachment Figure 9 It is a cross-sectional schematic diagram of the punching state of the punching tool for the locking step of the starting cup of the recoil starter of the present invention;

[0018] Attachment Figure 10 This is a three-dimensional schematic diagram of another embodiment of the punching tooling for the locking step of the recoil starter starting cup of the present invention.

[0019] The following is a further description of the punching tool for the locking step of the recoil starter starting cup of the present invention in conjunction with the accompanying drawings and specific embodiments. DETAILED DESCRIPTION

[0020] Attachment Figure 4 This is a three-dimensional schematic diagram of the punching tooling for the locking step of the recoil starter starting cup of the present invention, with Figure 5 It is a three-dimensional schematic diagram of the bottom mold of the present invention, Figure 6 The three-dimensional schematic diagram of the fixed stamping assembly of the present invention is shown in FIG. Figure 7 Attached is a three-dimensional schematic diagram of the fixed stamping assembly of the present invention. Figure 8 The three-dimensional schematic diagram and cross-sectional schematic diagram of the punch head of the present invention are shown in FIG. Figure 9It is a cross section schematic view of the punch state of the punch tool for the start cup locking step of the recoil starter of the present application. In the figure, 1 is a bottom die, 101 is a base plate, 102 is an inner column, 103 is a groove, 104 is a boss, 105 is a triangular notch, 2 is a fixed punch assembly, 201 is an inner positioning ring, 202 is an outer positioning ring, 203 is a sliding punch, 204 is a return spring, 205 is an adjusting bolt, 3 is a punch head, and A is a start cup blank.As can be seen from the figure, the punching tooling for the locking step of the recoil starter starter cup of the present invention includes a bottom die 1, a fixed punching assembly 2 and a punching head 3; the bottom die 1 is arranged on the base plate of the punching machine work table, and includes an inner column 102 and a chassis 101; the inner column 102 is a cylinder, and its diameter and length match the inner space of the starter cup; a boss 104 matching the through hole on the top surface of the starter cup is provided on the upper surface of the inner column, and triangular notches 105 that are the same in number, shape and size as the outer edge of the cross-sectional shape of the starter cup locking step are provided on the circumference of the inner column and run through the entire axial direction of the inner column; the chassis is fixedly connected to the bottom of the inner column, and a special-shaped flip that matches the bottom of the starter cup is provided on the upper surface of the chassis. The groove 103 that matches the edge; the fixed stamping part 2 is fixedly mounted on the piston of the outer cylinder of the punch on the stamping machine; it includes an inner positioning ring 201, an outer positioning ring 202, a sliding punch 203, a return spring 204 and an adjusting bolt 205; the inner positioning ring 201 is an annular cylinder, the inner diameter of which matches the outer diameter of the starting cup, and the height is higher than the starting cup; a rectangular guide hole with the same size as the radial shape of the locking step of the starting cup is provided at a set position on the circumference of the inner positioning ring, the set position of the rectangular guide hole is the position corresponding to the locking step after the starting cup is placed on the bottom die, and the number of the guide holes is the same as the number of locking steps on the starting cup; the sliding punch 203 is an annular cylinder, the inner diameter of which matches the outer diameter of the starting cup, and the height is higher than the starting cup; the set position on the circumference of the inner positioning ring is provided with a rectangular guide hole with the same size as the radial shape of the locking step of the starting cup, and the set position of the rectangular guide hole is the position corresponding to the locking step after the starting cup is placed on the bottom die, and the number of the guide holes is the same as the number of locking steps on the starting cup; the sliding punch 203 is an annular cylinder, the inner diameter of which matches the outer diameter of the starting cup, and the height is higher than the starting cup The movable punch 203 is long and has a front end of a punch with a rectangular cross-section and a rear end of a guide rod with a circular cross-section; an oblique punching port is provided on the front end face of the punch, and an outer arc-shaped inclined surface inclined outward from top to bottom is provided on the rear end face of the punch; the front end of the guide rod is fixedly connected to the rear end of the punch, and an adjusting thread is provided at the rear end; the outer positioning ring 202 is an annular cylinder, which is sleeved on the outside of the inner positioning ring; a circular through hole is provided on the circumference of the outer positioning ring for the punch guide rod to pass through, and the setting position and size of the circular through hole correspond to the position and size of the punch guide rod after the punch is sleeved in the rectangular guide hole of the inner positioning ring; the number of the circular through holes is the same as the number of the sliding punch; the complex The positioning spring 204 is sleeved on the guide rod of the sliding punch extending outward from the outer positioning ring; the adjusting bolt 205 is screwed onto the adjusting thread at the end of the sliding punch guide rod; the punch head 3 is fixedly mounted on the piston of the cylinder inside the punch on the punching machine, and is an annular cylindrical structure, whose inner diameter matches the outer diameter of the inner positioning ring, and its outer diameter matches the inner diameter of the outer positioning ring; an opening groove is provided at the bottom end of the punch head to avoid the sliding punch guide rod, and the size, position and number of the opening groove match the sliding punch guide rod; an inner arc-shaped inclined surface inclined outward from top to bottom is provided on the inner side surface of the bottom end of the punch head, and its inclination curvature is the same as the outer arc-shaped inclined surface at the rear end of the sliding punch punch.The punching tool for the locking step of the recoil starter cup of the present invention is provided with a triangular notch on the circumference of the bottom die that corresponds to the cross-sectional shape of the locking step. At the same time, an oblique punching notch is provided on the front end face of the sliding punch. This makes the inner side of the side wall of the starting cup blank partially hollow, and the outer side is directly in front of the oblique punching notch of the punch, providing good stamping and forming conditions. Since the front end face of the punch is an oblique punching notch, when it is subjected to the extrusion force and slides toward the side of the bottom die, it is first in line contact, and then in surface contact with a gradually increasing area. The deformation of the side wall of the starting cup blank is also a deformation from line to surface with a gradually increasing area. Therefore, the orderly deformation of the six locking steps can be guaranteed, and a very large punching force is not required. The sliding punch of the punching tool for the locking step of the recoil starter cup of the present invention slides in the rectangular guide hole of the inner positioning ring and the circular through hole of the outer positioning ring, respectively, to ensure the accuracy and reliability of the sliding position. The recoil starter starter cup locking step punching tool of the present invention has an outer arc-shaped inclined surface on the rear end surface of the sliding punch, which corresponds to the inner arc-shaped inclined surface on the inner side surface of the bottom end of the punch head. The single axial movement of the punch head is converted into radial movement of the six punches simultaneously, ensuring that the six punches punch the side wall of the starter cup blank at the same time, avoiding deformation of the starter cup blank due to uneven force. For specific processing (see attached). Figure 9 ), the starter cup blank is turned upside down on the bottom die, so that the through hole at the bottom of the starter cup blank is mounted on the boss on the upper surface of the inner column of the bottom die, and at the same time, the special-shaped flange of the starter cup blank should enter the groove on the upper surface of the bottom die chassis. Start the outer cylinder of the punch on the stamping bed, and the outer cylinder piston will place the fixed stamping part on the outside of the bottom die. At this time, the inner circle of the positioning ring in the fixed stamping assembly will be tightly attached to the outer circle of the starter cup blank and sleeved on the outside of the starter cup blank. At the same time, the bottom surface of the positioning ring in the fixed stamping assembly will be pressed against the upper surface of the flange of the starter cup blank; in essence, the radial and axial directions of the starter cup blank are precisely positioned and clamped. It can be seen that the fixed stamping assembly not only has the positioning function of standardizing the radial movement of the sliding punch, but also has the function of tightly fixing the starter cup blank in place before stamping. When the inner cylinder of the punch on the press is activated, the piston in the inner cylinder drives the punch axially downward. When the inner arc-shaped inclined surface on the inner side of the punch's bottom end contacts the outer arc-shaped inclined surface on the rear end of the sliding punch, the sliding punch is pushed radially toward the center of the circle, completing the stamping of the locking step of the starter cup blank. The inner cylinder of the press is activated, allowing the inner cylinder piston to return the punch to its original position. The outer cylinder of the press is activated, allowing the outer cylinder piston to return the fixed punch assembly to its original position. Because the triangular notch in the bottom die extends axially through the inner column of the bottom die, the starter cup blank can be removed along the axis of the inner column even though the locking step has been formed. Obviously, the tension of the return spring can be adjusted by adjusting the adjusting bolt to ensure that after the punch, driven by the inner cylinder piston of the press, leaves the sliding punch, the return spring pulls the sliding punch back to the set position.

[0021] Attachment Figure 10 This is a three-dimensional schematic diagram of another embodiment of the recoil starter starting cup locking step stamping tooling of the present invention. In the figure, 1 is the bottom die, 106 is the fixed stamping assembly guide column, 2 is the fixed stamping assembly, 206 is the fixed stamping assembly guide hole, 207 is the stamping head guide column, 3 is the stamping head, and 301 is the stamping head guide hole. As can be seen from the figure, in order to ensure that the fixed stamping assembly can be accurately positioned when it is sleeved on the outside of the starting cup blank, the recoil starter starting cup locking step stamping tooling of the present invention is further provided with circumferentially evenly distributed fixed stamping assembly guide columns 106 on the base plate of the punching machine work surface, and fixed stamping assembly guide holes 206 are provided at corresponding positions on the circumference of the fixed stamping assembly outer positioning ring. Therefore, when the outer cylinder piston of the punch on the punching machine drives the fixed stamping assembly to move downward, the guide columns 106 and guide holes 206 can ensure that the fixed stamping assembly is accurately positioned. Similarly, to ensure that the punch head can be accurately positioned during punching, the recoil starter starting cup locking step punching tooling of the present invention is further provided with punch head guide posts 207 evenly distributed around the circumference between the inner and outer positioning rings of the fixed punch assembly, and punch head guide holes 301 are provided at corresponding positions around the circumference of the punch head. As a result, when the cylinder piston inside the punch head on the punching bed drives the punch head to move downward, the guide posts 207 and guide holes 301 can ensure that the punch head is accurately positioned.

[0022] Obviously, the beneficial technical effect of the recoil starter starting cup locking step stamping tooling of the present invention is that six horizontal locking steps can be stamped at the same time at one time, which effectively improves production efficiency, reduces labor intensity, and reduces safety hazards.

Claims

1. A punching tool for locking the recoil starter cup, characterized in that: The tooling comprises a bottom die, a fixed punching assembly and a punching head; the bottom die is arranged on a base plate of a punching machine work surface, and comprises an inner column and a bottom plate; the inner column is a cylinder, and its diameter and length match the inner space of the starter cup; a boss is provided on the upper surface of the inner column to match the through hole on the top surface of the starter cup, and triangular notches are provided on the circumference of the inner column, the number, shape and size of which are the same as the outer edge of the cross-sectional shape of the starter cup locking step, and which run through the entire axial direction of the inner column; the number of the starter cup locking steps is six; the bottom plate is fixedly connected to the bottom of the inner column, and a groove is provided on the upper surface of the bottom plate to match the special-shaped flange of the bottom of the starter cup; The fixed punching assembly is fixedly mounted on the piston of the outer cylinder of the punch on the punching machine; it includes an inner positioning ring, an outer positioning ring, a sliding punch, a return spring and an adjusting bolt; the inner positioning ring is an annular cylinder, the inner diameter of which matches the outer diameter of the starting cup, and the height is higher than the starting cup; a rectangular guide hole with the same size as the radial shape of the locking step of the starting cup is provided at a set position on the circumference of the inner positioning ring, the set position of the rectangular guide hole is the position corresponding to the locking step after the starting cup is placed on the bottom die, and the number of the rectangular guide holes is the same as the number of locking steps on the starting cup; the sliding punch is long and has a front end The punch has a rectangular cross-section and a guide rod with a circular cross-section at the rear end; an oblique punching port is provided on the front end face of the punch, and an outer arc-shaped inclined surface inclined outward from top to bottom is provided on the rear end face of the punch; the front end of the guide rod is fixedly connected to the rear end of the punch, and the rear end is provided with an adjusting thread; the outer positioning ring is an annular cylinder, which is sleeved on the outer side of the inner positioning ring; a circular through hole is provided on the circumference of the outer positioning ring for the sliding punch guide rod to pass through, and the set position and size of the circular through hole correspond to the position and size of the sliding punch guide rod; the number of the circular through holes is the same as the number of sliding punches; the reset spring is sleeved on the outer positioning ring extending outward The adjusting bolt is screwed onto the adjusting thread at the end of the sliding punch guide rod; the punch head is fixedly mounted on the piston of the cylinder inside the punch on the punching machine, and is an annular cylindrical structure, whose inner diameter matches the outer diameter of the inner positioning ring, and its outer diameter matches the inner diameter of the outer positioning ring; an opening groove is provided at the bottom end of the punch head to avoid the sliding punch guide rod, and the size, position and number of the opening groove match the sliding punch guide rod; an inner arc-shaped inclined surface inclined outward from top to bottom is provided on the inner side surface of the bottom end of the punch head, and its inclination radius is the same as the outer arc-shaped inclined surface at the rear end of the sliding punch punch.

2. The recoil starter starting cup locking step punching tool according to claim 1, characterized in that: The base plate of the punching machine work surface is also provided with fixed punching assembly guide columns evenly distributed around the circumference, and fixed punching assembly guide holes are provided at corresponding positions on the circumference of the fixed punching assembly outer positioning ring.

3. The punching tool for the locking step of the recoil starter starting cup according to claim 1 or 2, characterized in that: Punching head guide columns evenly distributed around the circumference are provided between the inner positioning ring and the outer positioning ring of the fixed punching assembly, and punching head guide holes are provided at corresponding positions on the circumference of the punching head.

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