External hexagon blind hole bolt cold heading forming die

Abstract

The utility model relates to the field of bolt processing discloses a kind of outer hexagonal blind hole bolt cold heading forming die, including six sets of male die and six sets of female die, respectively first, second, third, fourth, fifth station male die and first, second, third, fourth, fifth station female die;Five sets of the male die and female die are correspondingly installed in multi-station bolt forming machine, and the blank is moved between five sets of the male die and female die by the material clamp system of forming machine, and the blank is sequentially subjected to rod part shrinkage, head upsetting and positioning hole and rod part angle forming, head preforming is cylindrical and internal hexagonal hole forming, hexagonal head preforming, hexagonal head forming and stretching blind hole.The utility model can directly form the rod part of bolt and the outer hexagonal head with flange and internal hexagonal hole and blind hole, can save 25.9% wire rod material, while reducing machining time and cost.

Claims

1. An outside hexagon blind hole bolt cold heading forming die, characterized in that, include: Five sets of male molds, including the male molds for the first, second, third, fourth, and fifth workstations; Five sets of female molds, including female molds for the first, second, third, fourth, and fifth stations respectively, corresponding to the male molds for the first, second, third, fourth, and fifth stations; The five sets of male and female molds are respectively installed on the multi-station bolt forming machine. The blank is moved between the five sets of male and female molds through the material clamping system of the forming machine. The blank is subjected to the following processes in sequence: rod shrinkage, head upsetting and drilling positioning holes, rod angle reduction forming, head preforming into a cylinder and internal hexagonal hole forming, hexagonal head preforming, hexagonal head forming and stretching blind hole.

2. The hexagon socket blind bolt cold heading forming die according to claim 1, characterized in that, The first station male mold includes: The first male mold is fixed on the molding machine and is used to fix and push the first male mold ejector pin; The first-stage male mold ejector pin has one end movably installed inside the first-stage male mold, and the other end is used to extrude the blank located in the first-stage female mold; A male mold pad is placed inside the male mold to support the male mold ejector pin. The first station's female mold includes: A female mold sleeve is installed on the molding machine opposite to a male mold sleeve; A closed shrinking rod mold is set inside a first-sequence female mold sleeve, which has a cavity for strongly shrinking the rod part of the blank. A first-order female mold ejector pin is located inside the closed shrinking mold and is used to limit the end of the blank and eject the workpiece; The first-order female mold ejector sleeve is used to fix the first-order female mold ejector.

3. The hexagon socket blind bolt cold heading forming die according to claim 2, characterized in that, The sequential closed shrinking rod mold consists of a sequential straight-through mold one, a sequential straight-through mold two, a sequential shrinking rod mold, a sequential female mold pad, and a sequential female mold locking sleeve. The sequential straight-through mold one, sequential straight-through mold two, sequential shrinking rod mold, and sequential female mold pad are sequentially arranged inside the sequential female mold sleeve and are fixed to the sequential female mold sleeve by the sequential female mold locking sleeve. The sequential straight-through mold one, sequential straight-through mold two, and sequential shrinking rod mold are respectively provided with a sequential straight-through mold core one, a sequential straight-through mold core two, and a sequential shrinking rod mold core, wherein the hardness of the sequential straight-through mold core two is not greater than the hardness of the sequential straight-through mold core one and the sequential shrinking rod mold core.

4. The hexagon socket blind bolt cold heading forming die according to claim 1, characterized in that, The second station male mold includes: The second male mold sleeve is fixed on the molding machine; The second male mold is movably installed at the end of the second male mold sleeve, and its end is provided with a second male mold core. The second male mold core is provided with a cavity for upsetting the head of the workpiece. The second-order male mold ejector pin is located inside the second-order male mold and extends into the cavity of the second-order female mold. The end of the second-order male mold ejector pin is provided with a boss for drilling positioning holes for the head of the workpiece. The second-order gasket is located at the tail of the second-order male mold sleeve; The second-order spring is located inside the second-order male mold sleeve, with one end abutting against the second-order pad sleeve and the other end abutting against the second-order male mold. The second male mold pad is provided inside the second male mold sleeve and is used to limit the second male mold and the second male mold ejector rod; The second station female mold includes: The second-order female mold sleeve is installed on the molding machine opposite to the second-order male mold; The second-order circular meson is embedded in the end inner hole of the second-order female mold sleeve; The second-order angle reduction mold is located inside the second-order female mold sleeve, behind the second-order round mold. It contains a second-order angle reduction mold core, which, together with the second-order round mold, is used to reduce the angle of the rod part of the workpiece. The second-order female mold locking sleeve is screwed to the second-order female mold sleeve and is used to lock the second-order angle reduction mold. The second-stage female mold ejector pin is located inside the second-stage constricted angle mold and is used to limit the end of the blank and eject the workpiece; The second-order female mold ejector sleeve is used to fix the second-order female mold ejector.

5. The cold heading die for external hexagonal blind hole bolts according to claim 1, characterized in that, The third station male mold includes: The three-stage male mold sleeve is fixed on the forming machine, and its end is fitted with a three-stage male mold core for preforming the head end face of the workpiece. The ejector pin of the third-order male mold has its end penetrating through the core of the third-order male mold and is located inside the third-order male mold sleeve. It is used to form the internal hexagonal hole at the head of the workpiece. The third-order male mold pad is located inside the third-order male mold sleeve and is used to support the third-order male mold ejector rod. The third station female mold includes: The three-stage female mold sleeve is installed on the molding machine opposite to the three-stage male mold sleeve; The three-stage round insert is fitted into the end inner hole of the three-stage female mold sleeve and is used to pre-form the head of the workpiece into a cylinder. The three-stage straight-through mold consists of three-stage straight-through mold one and three-stage straight-through mold two arranged in sequence, and is used to constrain the shape of the workpiece rod. The three-stage female mold locking sleeve is screwed to the three-stage female mold sleeve and is used to lock the three-stage straight mold. The three-stage female mold ejector pin is located inside the three-stage straight mold and is used to limit the end of the blank and eject the workpiece; The three-stage female mold ejector sleeve is used to fix the three-stage female mold ejector.

6. The cold heading die for external hexagonal blind hole bolts according to claim 1, characterized in that, The fourth station male mold includes: The fourth-order male mold sleeve is fixed on the forming machine, and its end is fitted with a fourth-order male mold core for preforming the hexagonal head of the workpiece. The fourth-order male mold ejector pin is located inside the fourth-order male mold sleeve, and its end extends into the cavity of the fourth-order male mold core to abut against the end face of the workpiece. The fourth-order male mold pad is located inside the fourth-order male mold sleeve and is used to pad the fourth-order male mold ejector rod. The fourth station female mold includes: The fourth-order female mold sleeve is installed on the molding machine opposite to the fourth-order male mold sleeve; The fourth-order female mold ejector tube has a head that protrudes from the fourth-order female mold sleeve and is installed inside the fourth-order female mold sleeve. The protruding head is used inside the fourth-order male mold core and is used for the bottom surface of the pre-formed workpiece head. The inner diameter of the fourth-order female mold ejector tube is equal to the diameter of the large cylinder of the workpiece rod. The fourth-order female mold pad is located inside the fourth-order female mold sleeve and is used to pad the fourth-order female mold top tube; The fourth-order female mold locking sleeve is screwed onto the fourth-order female mold sleeve and is used to lock the fourth-order female mold pad block; The fourth-order female mold push tube is movably located inside the fourth-order female mold top tube and the fourth-order female mold pad, and the inner diameter of the fourth-order female mold push tube is equal to the diameter of the small cylinder of the workpiece rod, and is used to push out the workpiece. The fourth-order female mold pad sleeve is disposed inside the fourth-order female mold locking sleeve and abuts against the fourth-order female mold pad block; The four-order spring is located inside the four-order female mold pad, with one end abutting against the four-order female mold push tube and the other end abutting against the four-order female mold pad sleeve, and is used to provide the restoring force of the four-order female mold push tube; The fourth-order female mold ejector pin is located inside the fourth-order female mold push tube and is used to limit the end of the blank and push the workpiece out of the fourth-order female mold push tube. The fourth-order female mold ejector sleeve is used to fix the fourth-order female mold ejector.

7. The hexagon socket blind bolt cold heading forming die according to claim 1, characterized in that, The fifth station male mold includes: The five-stage male mold sleeve is fixed on the forming machine, and its end is fitted with a five-stage male mold core for forming the hexagonal head of the workpiece; The fifth-order hexagonal bar is located inside the fifth-order male mold sleeve and extends into the cavity of the fifth-order male mold core to abut against the end face of the workpiece head. The five-stage four-hole pad is set inside the five-stage male mold sleeve to support the five-stage hexagonal bar. The middle part is provided with a mounting hole for installing the five-stage punching bar, and three through holes for installing the five-stage ejector pin are evenly distributed on the outer periphery of the mounting hole. The five-stage punching bar has one end located in the middle of the five-stage four-hole pad, and the other end passes through the five-stage hexagonal bar and extends out to form the five-stage male die sleeve, which is used to punch out blind holes in the workpiece. The five-stage three-hole pad is set inside the five-stage male mold sleeve to support the five-stage punching rod, and each five-stage three-hole pad has three through holes for installing the five-stage ejector pin. The fifth-order ejector pin has three pins, which are respectively located in the through holes of the fifth-order three-hole pad and the fifth-order four-hole pad, and are used to push the fifth-order hexagonal bar to eject the workpiece out of the fifth-order male mold core. The fifth-order pad is located at the tail end of the fifth-order male mold sleeve; The five-stage pad is located inside the five-stage pad sleeve and is used to push the five-stage ejector pin; The fifth station female mold includes: The fifth-order female mold sleeve is installed on the forming machine opposite to the fifth-order male mold sleeve, and it is provided with a binding rod mold core for constraining the workpiece rod. The fifth-order female mold ejector pin is located inside the female mold sleeve and is used to limit the end of the blank and eject the workpiece; The fifth-order female mold ejector sleeve is used to fix the fifth-order female mold ejector.

8. The hexagon socket blind bolt cold heading forming die according to claim 6, characterized in that, A five-order washer ring is also provided between the five-order three-hole pad block and the five-order washer sleeve.

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