A small end chamfering die device capable of preventing the large and small ends of a tapered roller from being under-pressurized

Abstract

The present invention relates to a tapered roller stamping device, and more specifically, to a small end chamfering die device that can prevent the large and small ends of a tapered roller from being under-stressed. It comprises a chamfering die body and a push rod, the push rod is mounted in a stepped hole provided at the bottom of the chamfering die body, the cross-sectional shape of the push rod is a T-shape corresponding to the shape of the stepped hole, the outer periphery of the large end of the push rod is tightly slidably matched with the inner periphery of the large hole in the stepped hole, the small end of the push rod has an arc-shaped protrusion, the outer periphery of the small end of the push rod is gap-matched with the inner periphery of the small hole in the stepped hole, and an exhaust hole is provided on the chamfering die body for exhausting air between the outer periphery of the small end of the push rod and the inner periphery of the small hole in the stepped hole. The present invention can avoid the under-stressing of the large and small ends during the stamping process of the tapered roller, and avoid the oil and gas explosion phenomenon that is easily generated during the stamping process.

Description

Technical Field

[0001] The invention relates to a tapered roller stamping device, in particular to a small end chamfering die device which can prevent the large and small ends of a tapered roller from being under-pressurized. Background Art

[0002] In the prior art, the small end chamfering die used for stamping of tapered rollers usually includes a chamfering die body and a push rod. A straight hole is opened at the bottom of the chamfering die body, and the outer periphery of the push rod is tightly slidably fitted in the straight hole to prevent the push rod from tilting during the stamping process. The push rod is positioned in a plane and is flush with the bottom of the die groove on the chamfering die body after being molded with the chamfering die body.

[0003] The above structure makes it impossible to remove the air in the die groove at the moment of stamping, which not only causes the small end of the tapered roller to be under-punched due to pressure, but also the large end to be under-punched due to the violent turbulence of the gas in the die groove. Furthermore, the violent air compression during the stamping process will also cause oil and gas explosion at the bottom of the die groove, and the instantaneous high temperature generated will corrode the die groove of the chamfering die body, causing irreversible damage to the chamfering die body. Summary of the invention

[0004] The present invention aims to provide a small end chamfering die device which can prevent underpressure of large and small ends of a tapered roller, avoid underpressure of large and small ends produced during the stamping process of the tapered roller, and avoid oil and gas explosion which is easy to occur during the stamping process.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a small-end chamfering die device that can prevent the large and small ends of a tapered roller from being under-pressurized, comprising a chamfering die body and a push rod, the push rod being mounted in a step hole opened at the bottom of the chamfering die body, the cross-sectional shape of the push rod being a T-shape corresponding to the shape of the step hole, the outer periphery of the large end of the push rod being tightly slidably matched with the inner periphery of the large hole in the step hole, the small end of the push rod having an arc-shaped protrusion, the outer periphery of the small end of the push rod being gap-matched with the inner periphery of the small hole in the step hole, and an exhaust hole for discharging air between the outer periphery of the small end of the push rod and the inner periphery of the small hole in the step hole.

[0006] Preferably, the exhaust hole is opened in the horizontal direction, and an annular groove connected to the exhaust hole is opened at the inner circumference of the small hole of the step hole.

[0007] Preferably, the height of the large end of the push rod is smaller than the height of the large hole in the step hole.

[0008] Beneficial Effects

[0009] There is a gap between the periphery of the ejector pin and the step hole, and a vent hole is provided on the chamfering die body for connecting the gap with the outside. During the stamping process, gas is discharged from the gap through the vent hole. This avoids the under-punching phenomenon of the large and small ends of the tapered roller due to the inability to exhaust gas, and at the same time avoids the damage to the chamfering die body caused by high-temperature oil and gas explosion.

[0010] The push rod in the present invention is T-shaped, and a step hole for the push rod to be installed is provided at the lower part of the chamfering die body. An arc-shaped protrusion is provided on the top of the push rod. During the stamping process of the tapered roller, the middle part of the lower end of the blank begins to be stressed first, and the lower end of the blank is deformed evenly from the middle part to the periphery, further avoiding under-punching of the small end. Correspondingly, a process depression is formed after the small end is stamped, so that the blank material is squeezed toward the large end, so that the large end can also avoid under-punching. The protrusion on the top of the push rod can also guide the air from the chamfering die body into the gap between the push rod and the step hole during the stamping process, further improving the improvement effect of the present invention on under-punching and oil and gas explosion of the large and small ends of the tapered roller.

[0011] In the present invention, the large end of the ejector pin is tightly slidably matched with the step hole, and the tight matching relationship forms a guiding effect on the ejector pin as a whole, ensuring that the small end of the ejector pin is not skewed during the stamping process, thereby extending the service life of the ejector pin. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a split schematic diagram of the present invention;

[0013] Figure 2 It is a schematic diagram of the state of the present invention before stamping;

[0014] Figure 3 for Figure 2 Schematic diagram of the state after stamping;

[0015] Markings in the figure: 1. chamfering die body, 2. step hole, 3. annular groove, 4. exhaust hole, 5. protrusion, 6. ejector rod, 7. horizontal base, 8. lower gap, 9. return spring, 10. spring groove, 11. upper gap. DETAILED DESCRIPTION

[0016] like Figure 1 As shown, a small end chamfering die device for preventing underpressure of large and small ends of a tapered roller of the present invention comprises a chamfering die body 1 and a push rod 6. A step hole 2 for the push rod 6 to be installed is provided at the center of the bottom of the chamfering die body 1. The small hole in the step hole 2 faces upward and is connected to the die groove of the chamfering die body 1, and the large hole faces downward for the push rod 6 to be inserted.

[0017] The cross-sectional shape of the push rod 6 is a T-shape corresponding to the shape of the step hole 2. The outer periphery of the large end of the push rod 6 is tightly slidably matched with the inner periphery of the large hole in the step hole 2, and the height of the large end of the push rod 6 is less than the height of the large hole in the step hole 2. The small end of the push rod 6 has an arc-shaped protrusion 5, and the outer periphery of the small end of the push rod 6 is gap-matched with the inner periphery of the small hole in the step hole 2. The chamfering die body 1 is provided with an exhaust hole 4 for exhausting air between the outer periphery of the small end of the push rod 6 and the inner periphery of the small hole in the step hole 2. The exhaust hole 4 is opened in the horizontal direction, and an annular groove 3 connected to the exhaust hole 4 is opened at the inner periphery of the small hole in the step hole 2.

[0018] like Figure 2 As shown, the present invention is arranged on a horizontal base 7 in application, and a spring slot 10 is arranged on the horizontal base 7 at a position corresponding to the large end of the push rod 6, and a return spring 9 is arranged in the spring slot 10. Before stamping, the push rod 6 is pushed upward by the return spring 9, and is limited by the step hole 2, and a lower gap 8 is formed between the bottom of the large end of the push rod 6 and the horizontal base 7. Figure 3 As shown, after stamping, the push rod 6 drops as a whole with the stamping force to be flush with the horizontal base 7, and the protrusion 5 on the top of the push rod 6 contacts the middle of the lower end of the blank, completing the stamping. The air in the stamping process enters the annular groove 3 from the peripheral surface of the small end of the push rod 6 and the inner peripheral part of the small hole in the step hole 2, and is finally discharged from the exhaust hole 4. At this time, the upper edge of the large end of the push rod 6 and the step position in the step hole 2 form an upper gap 11. After the stamping is completed, as the stamping pressure disappears, the reset spring 9 pushes the push rod 6 up again to the position shown in FIG. Figure 2 The state shown. The push rod 6 lifts up the molded conical roller in the yeast body to achieve demoulding. In the actual stamping forming of the conical roller, a middle mold and a top mold are also arranged in sequence on the upper part of the chamfering mold body 1. Since it is a conventional general technology in this field and has little relevance to the present invention, it is not involved in the figure.

Claims

1. A small end chamfering die device capable of preventing underpressure at the large and small ends of a tapered roller, comprising a chamfering die body (1) and a push rod (6), characterized in that: The push rod (6) is mounted in a stepped hole (2) formed at the bottom of the chamfering die body (1). The cross-sectional shape of the push rod (6) is a T-shape corresponding to the shape of the stepped hole (2). The outer periphery of the large end of the push rod (6) is tightly slidably matched with the inner periphery of the large hole in the stepped hole (2). The small end of the push rod (6) has an arc-shaped protrusion (5). The outer periphery of the small end of the push rod (6) is gap-matched with the inner periphery of the small hole in the stepped hole (2). The chamfering die body (1) is provided with an exhaust hole (4) for exhausting air between the outer periphery of the small end of the push rod (6) and the inner periphery of the small hole in the stepped hole (2). The exhaust hole (4) is opened in the horizontal direction, and an annular groove (3) connected to the exhaust hole (4) is opened at the inner circumference of the small hole of the step hole (2); The height of the large end of the push rod (6) is smaller than the height of the large hole in the step hole (2).

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