Punching die for punching outer ring

Abstract

The utility model provides a punching outer ring punching die. The punching outer ring punching die comprises a bottom cutting female die, a positioning female die and a bottom cutting male die. The circumferential lower end face of the bottom cutting male die is a stamping cutting edge, the bottom cutting male die is arranged above the positioning female die, and the power mechanism drives the bottom cutting male die to do lifting motion relative to the bottom cutting female die. An ejector pin cavity is formed in the lower end face of the bottom cutting male die in a concave mode and elastically connected with a waste ejector pin, and the lower end face of the waste ejector pin elastically extends out of the lower end face of the bottom cutting male die. According to the utility model, the waste ejector pin is designed on the bottom-cutting convex die, and the processed waste can be ejected out from the lower end surface of the bottom-cutting convex die by utilizing the elastic force of the spring, so that the waste is prevented from being adhered to the bottom-cutting convex die, the service life of the die is effectively prolonged, and the yield of the appearance of a product is improved.

Description

Technical Field

[0001] The utility model relates to the field of die design, and in particular to a punching die for punching outer rings of a punching outer ring bottom cutting punch in bearing processing. Background Art

[0002] Stamping is a common method in bearing processing. Punches and molds are usually used to apply external force to plates / strips / tubes / profiles, etc., to cause plastic deformation or separation of the raw materials, thereby obtaining the desired shape and size. When stamping the outer ring of the bearing, the structure usually adopted is to set the bottom cutting die and the positioning die on the pad from bottom to top, and use a clamp to clamp and position the mold. The bottom cutting punch is controlled by a power mechanism and set above the bottom cutting die, and the circumference of the lower end of the bottom cutting punch is a stamping cutting edge. The outer ring of the bearing to be processed is placed in the mold accordingly, and the bottom cutting punch moves from top to bottom, cooperating with the bottom cutting die to complete the bottom cutting operation of the outer ring of the bearing.

[0003] The use of traditional cutting die will cause material stretching and oil influence during the processing. The thick raw material will be stretched and thinned when stamped. When the oil is sticky, the upper surface of the cutting waste will contact the lower end surface of the cutting punch during the processing. The cutting waste will stick to the cutting punch. When the second product is cut again, the cutting punch and the cutting die will be damaged, so that the burrs on the outer ring surface processed later will become larger and cannot be removed, resulting in product scrapping. Utility Model Content

[0004] The technical problem to be solved by the utility model is: in order to overcome the shortcomings of the prior art, the utility model provides a punching die for a stamping outer ring, which effectively improves the bottom cutting die, can effectively avoid waste materials from sticking to the lower end surface of the bottom cutting die during stamping, effectively improve the life of the die, and reduce the poor appearance of the product during the stamping process.

[0005] The utility model solves the technical problem by adopting the following technical scheme: a punching die for punching outer rings, which is used for punching outer rings of bearings, and comprises a bottom cutting die, a positioning die and a bottom cutting convex die; the positioning die is positioned on the upper end surface of the bottom cutting die, a bottom cutting through hole is provided on the bottom cutting die, and a positioning through hole is provided on the positioning die; the circumferential lower end surface of the bottom cutting convex die is a punching cutting edge, the bottom cutting convex die is provided above the positioning die, and the bottom cutting convex die is driven by a power mechanism to perform lifting and lowering motion relative to the bottom cutting die; the center lines of the bottom cutting through hole, the positioning through hole and the punching cutting edge are located on the same straight line; an ejector cavity is concavely provided on the lower end surface of the bottom cutting convex die, a waste ejector cavity is elastically connected to the ejector cavity, and the lower end surface of the waste ejector elastically extends out from the lower end surface of the bottom cutting convex die.

[0006] In the above scheme, a waste ejector pin is elastically designed on the lower end surface of the bottom cutting die. The waste ejector pin retracts under force and elastically resets to push out of the bottom cutting die. The waste that may be adhered to the lower end surface of the bottom cutting die can be effectively ejected downward during the stamping process and fall off, thereby protecting the bottom cutting punch and the bottom cutting die and effectively improving the processing yield rate.

[0007] Furthermore, the mold also includes a cushion block, a clamp block is arranged above the cushion block, a countersunk hole is opened on the cushion block, the countersunk hole is a stepped hole with at least two steps, the bottom cutting die is positioned and crimped on the stepped surface at the top of the countersunk hole, and the inner diameter of the hole below the stepped surface is larger than the hole diameter of the bottom cutting die; the clamp block presses the positioning die, the bottom cutting die and the cushion block firmly. The design of the cushion block can effectively raise the bottom cutting convex die, and the stepped hole provides space for the positioning setting of the bottom cutting die, and also provides a guide and storage space for the waste to fall.

[0008] The range of elastic extension of the waste ejector relative to the lower end surface of the bottom cutting punch is adjustable. Specifically, the ejector chamber is provided through the bottom cutting punch, and is divided into a threaded section, a smooth section and a contraction section that are sequentially connected from top to bottom; the threaded section is threadedly connected with an adjustable screw, and a spring is arranged in the smooth section, the upper end of the spring is fixed to the adjustable screw, and the lower end is fixed to the waste ejector, the inner diameter of the contraction section is smaller than the inner diameter of the smooth section, and is a step-shaped structure, and the waste ejector is a T-shaped structure, which includes a transverse part and a longitudinal part connected below the transverse part, wherein the lower end surface of the transverse part is crimped on the step surface of the smooth section and the contraction section, and the longitudinal part extends from the lower end surface of the bottom cutting punch after penetrating the contraction section. During processing, by rotating the adjustable screw, the position of the adjustable screw can be adjusted relative to the threaded end, thereby driving the spring connected thereto and the waste ejector relative to the overall ejector chamber to undergo up and down displacement adjustment.

[0009] In order to facilitate the waste to fall off from the waste ejector, an exhaust hole is opened on the smooth section, the inner end of the exhaust hole is connected to the inner cavity of the smooth section, and the outer end is connected to the outside world; the circumferential outer diameter of the longitudinal part of the waste ejector is smaller than the inner diameter of the contraction section, that is, there is a contraction gap between the outer circumferential surface of the longitudinal part and the inner wall of the contraction section, and the gap is connected to the air path of the inner cavity of the smooth section.

[0010] Preferably, the gas path is connected through a padding block. The upper protrusions of the step surfaces of the smooth section and the contraction section are provided with padding blocks. When the transverse portion of the waste ejector pin is crimped onto the upper end surface of the padding block, a connection gap is formed between the outer peripheral surface of the padding block and the waste ejector pin, and the connection gap connects the contraction gap with the gas path between the inner cavity of the smooth section. Through the gas path setting of the contraction gap, the connection gap, the inner cavity of the smooth section and the exhaust cavity, the gas can be discharged outward along the gas path during punching, thereby avoiding defects such as scratches on the inner diameter of the product due to the inability to exhaust gas during product processing.

[0011] In order to reduce the contact area between the waste and the bottom cutting die, and further reduce the probability of the waste sticking to the bottom cutting die, the bottom cutting die has a waste countersink on the lower end surface, and the diameter of the waste countersink is larger than the inner diameter of the contraction section and smaller than the outer diameter of the waste. After punching, the waste ejector pin will push the waste downward under the action of the spring force, push the waste into the bottom cutting die, and then fall along the waste countersink to complete the shedding and discharge of the waste.

[0012] The beneficial effect of the utility model is that the utility model provides a stamping outer ring punching die with a reasonable structural design. By designing a waste ejector pin on the bottom cutting punch, the processed waste can be ejected from the lower end surface of the bottom cutting punch by using spring force, thereby avoiding the waste from sticking to the bottom cutting punch, effectively prolonging the die life, and improving the yield rate of product appearance. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0014] Figure 1 It is a structural schematic diagram of the optimal embodiment of the utility model.

[0015] Figure 2 yes Figure 1 A magnified schematic diagram of center A.

[0016] In the figure, 1, clamp block 2, waste material 3, adjustable screw 4, spring 5, vent hole 6, bottom cutting punch 7, waste ejector pin 8, positioning die 9, bottom cutting die 10, cushion block 11, shrinkage gap 12, cushion block 13, connection gap DETAILED DESCRIPTION

[0017] The utility model is now described in further detail in conjunction with the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, so they only show the components related to the utility model, and the directions and references (for example, up, down, left, right, etc.) can only be used to help describe the features in the drawings. Therefore, the following specific embodiments are not adopted in a restrictive sense, and the scope of the subject matter claimed is limited only by the attached claims and their equivalents.

[0018] like Figure 1 and Figure 2 The punching die for punching outer ring shown is the best embodiment of the utility model. The punching die for punching outer ring is used for punching outer ring of bearing, and comprises a bottom cutting die 9, a positioning die 8, a bottom cutting punch 6, a cushion block 10 and a clamp block 1.

[0019] In this embodiment, the cushion block 10 is arranged at the bottom. The positioning die 8 is positioned on the upper end surface of the bottom cutting die 9, the bottom cutting die 9 is provided with a bottom cutting through hole, and the positioning die 8 is provided with a positioning through hole; the circumferential lower end surface of the bottom cutting punch 6 is a stamping edge, the bottom cutting punch 6 is arranged above the positioning die 8, and the power mechanism drives the bottom cutting punch 6 to move up and down relative to the bottom cutting die 9.

[0020] Specifically, a countersunk hole is formed on the cushion block 10, and the countersunk hole is a stepped hole with three steps. The bottom cutting die 9 is positioned and crimped on the stepped surface at the top of the countersunk hole, and the inner diameter of the hole below the stepped surface is larger than the aperture of the bottom cutting die 9. During assembly, the bottom cutting die 9 is placed in the corresponding countersunk hole, the positioning die 8 is crimped on the bottom cutting die 9, and the positioning die 8 and the bottom cutting die 9 are effectively positioned and fixed by the clamping block 1. The design of the cushion block 10 can effectively raise the bottom cutting punch 6. The step hole provides space for the positioning setting of the bottom cutting die 9 on the one hand, and also provides a guide and storage space for the waste 2 to fall. The center lines of the bottom cutting through hole, the positioning through hole, the stamping edge, and the countersunk hole on the cushion block 10 are all located on the same straight line. This straight line is also the reciprocating motion direction of the bottom cutting punch 6 driven by the power mechanism during processing.

[0021] Compared with the structure in which the lower end surface of the bottom cutting punch 6 in the traditional bottom cutting die is a plane, the present embodiment has further reasonably designed the lower end surface of the bottom cutting punch 6. The lower end surface of the bottom cutting die 9 is concave with a waste material 2 countersink, and the diameter of the waste material 2 countersink is larger than the inner diameter of the contraction section and smaller than the outer diameter of the waste material 2. This design can effectively reduce the contact area between the waste material 2 and the lower end surface of the bottom cutting punch 6 after punching, reduce the friction between the two, and further reduce the probability of the waste material 2 sticking to the bottom cutting die 9.

[0022] In this embodiment, the most improved design for avoiding the adhesion of the waste 2 is to elastically set the waste 2 ejector pin 7 on the bottom cutting punch 6. The elastic extension range of the waste 2 ejector pin 7 relative to the lower end surface of the bottom cutting punch 6 is adjustable.

[0023] Specifically, an ejector cavity is formed through the bottom cutting punch 6. The ejector cavity is divided into a threaded section, a smooth section and a contraction section which are connected in sequence from top to bottom.

[0024] The threaded section is threadedly connected with an adjustable screw 3, and the adjustable screw 3 can preferably be a T-type screw, so that the top of the T-type screw is pressed against the upper end surface of the bottom cutting punch 6 when adjusted to the lowest position, which plays a limiting role. A spring 4 is arranged in the smooth section, and the upper end of the spring 4 is fixed to the lower end surface of the adjustable screw 3, and the lower end is fixed to the upper end surface of the waste 2 ejector pin 7. The inner diameter of the contraction section is smaller than the inner diameter of the smooth section and has a step-like structure. The waste 2 ejector pin 7 is a T-type structure, which includes a transverse part and a longitudinal part connected below the transverse part, wherein the lower end surface of the transverse part is pressed against the step surface of the smooth section and the contraction section, and the longitudinal part penetrates the contraction section and extends from the lower end surface of the bottom cutting punch 6. During processing, by rotating the adjustable screw 3, the position of the adjustable screw 3 can be adjusted relative to the threaded end, thereby driving the spring 4 connected thereto and the waste 2 ejector pin 7 to be adjusted in terms of the upward and downward displacement relative to the overall ejector chamber.

[0025] During punching, the outer ring of the bearing to be processed falls into the positioning through hole, and the lower end surface of the outer ring of the bearing is supported by the upper end surface of the bottom cutting die 9. At this time, the power mechanism drives the bottom cutting punch 6 to press down for punching, and the inner circle of the outer ring of the bearing is punched and cut. After the punching is completed, the power mechanism drives the bottom cutting punch 6 to lift up. During the punching process, the ejector pin 7 of the scrap 2 is compressed by the spring 4 and moves upward. After the punching is completed, the bottom cutting punch 6 moves upward, and the spring 4 drives the ejector pin 7 of the scrap 2 to reset and move downward. The lower end of the ejector pin 7 of the scrap 2 continues to return to the state of extending from the lower end surface of the bottom cutting punch 6. In this process, the scrap 2 that may be adhered to the lower end surface of the bottom cutting die 9 is pushed downward and falls off downward, thereby completing the discharge of the scrap 2 through the bottom cutting through hole of the bottom cutting die 9 and the step hole of the cushion block 10.

[0026] In the technology of the above structure, in order to facilitate the gas discharge during punching, an exhaust hole 5 is also opened on the smooth section, and the inner end of the exhaust hole 5 is connected to the inner cavity of the smooth section, and the outer end is connected to the outside. The circumferential outer diameter of the longitudinal part of the waste 2 ejector pin 7 is smaller than the inner diameter of the contraction section, that is, there is a contraction gap 11 between the outer circumferential surface of the longitudinal part and the inner wall of the contraction section. A padding block 12 is provided on the upper protrusion of the step surface of the smooth section and the contraction section. When the transverse part of the waste 2 ejector pin 7 is crimped on the upper end surface of the padding block 12, a connecting gap 13 is formed between the outer circumferential surface of the padding block 12 and the waste 2 ejector pin 7. The connecting gap 13 connects the contraction gap 11 with the gas path between the inner cavity of the smooth section. Through the gas path setting of the contraction gap 11, the connecting gap 13, the inner cavity of the smooth section and the exhaust cavity, the gas can be discharged outward along the gas path during punching, avoiding defects such as scratches on the inner diameter of the product due to the inability to exhaust gas during product processing.

[0027] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without departing from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A punching die for punching outer rings, used for punching outer rings of bearings, characterized by: The invention comprises a bottom cutting die (9), a positioning die (8) and a bottom cutting punch (6); the positioning die (8) is positioned on the upper end surface of the bottom cutting die (9); a bottom cutting through hole is formed on the bottom cutting die (9); and a positioning through hole is formed on the positioning die (8); the circumferential lower end surface of the bottom cutting punch (6) is a stamping edge; the bottom cutting punch (6) is arranged above the positioning die (8), and is driven by a power mechanism to move the bottom cutting punch (6) up and down relative to the bottom cutting die (9); the center lines of the bottom cutting through hole, the positioning through hole and the stamping edge are located on the same straight line; a pin chamber is concavely formed in the lower end surface of the bottom cutting punch (6); the pin chamber is elastically connected to a waste material (2) pin (7); and the lower end surface of the waste material (2) pin (7) elastically extends out from the lower end surface of the bottom cutting punch (6).

2. A punching die for punching outer ring according to claim 1, characterized in that: The invention comprises a cushion block (10) and a clamp block (1), wherein the clamp block (1) is arranged above the cushion block (10), a countersunk hole is formed on the cushion block (10), the countersunk hole is a stepped hole with at least two steps, the bottom cutting die (9) is positioned and crimped on the stepped surface at the top of the countersunk hole, and the inner diameter of the hole below the stepped surface is larger than the hole diameter of the bottom cutting die (9); the clamp block (1) crimps the positioning die (8), the bottom cutting die (9) and the cushion block (10) firmly.

3. A punching die for punching outer ring according to claim 1, characterized in that: The ejector chamber is provided through the bottom cutting punch (6), and is divided into a threaded section, a smooth section and a contraction section which are connected in sequence from top to bottom; the threaded section is threadedly connected with an adjustable screw (3), a spring (4) is arranged in the smooth section, the upper end of the spring (4) is fixed to the adjustable screw (3), and the lower end is fixed to the waste material (2) ejector (7), the inner diameter of the contraction section is smaller than the inner diameter of the smooth section, and presents a step-shaped structure, the waste material (2) ejector (7) is a T-shaped structure, the T-shaped structure comprises a transverse portion and a longitudinal portion connected below the transverse portion, wherein the lower end surface of the transverse portion is pressed against the step surface of the smooth section and the contraction section, and the longitudinal portion extends out from the lower end surface of the bottom cutting punch (6) after passing through the contraction section.

4. A punching die for punching outer ring according to claim 3, characterized in that: The smooth section is provided with an exhaust hole (5), the inner end of the exhaust hole (5) is connected to the inner cavity of the smooth section, and the outer end is connected to the outside world; the circumferential outer diameter of the longitudinal part of the waste material (2) ejector pin (7) is smaller than the inner diameter of the contraction section, that is, there is a contraction gap (11) between the outer circumferential surface of the longitudinal part and the inner wall of the contraction section, and the gap is connected to the air path of the inner cavity of the smooth section.

5. A punching die for punching outer ring according to claim 4, characterized in that: A padding block (12) is provided on the upper protrusion of the step surface of the smooth section and the contraction section. When the transverse portion of the ejector pin (7) of the waste material (2) is pressed against the upper end surface of the padding block (12), a connecting gap (13) is formed between the outer peripheral surface of the padding block (12) and the ejector pin (7) of the waste material (2). The connecting gap (13) connects the contraction gap (11) with the inner cavity of the smooth section through an air path.

6. A punching die for punching outer ring according to claim 1, characterized in that: The lower end surface of the bottom cutting die (9) is concavely provided with a waste material (2) countersunk hole, and the diameter of the waste material (2) countersunk hole is larger than the inner diameter of the contraction section and smaller than the outer diameter of the waste material (2).

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