CN211588412U

CN211588412U - Screw cold heading mould

Info

Publication number: CN211588412U
Application number: CN201922464347.2U
Authority: CN
Inventors: 黄秀玉
Original assignee: Zhejiang Qiantai Motorcycle Parts Co ltd
Current assignee: Zhejiang Qiantai Motorcycle Parts Co ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-09-29
Anticipated expiration: 2029-12-31

Abstract

The utility model discloses a screw rod cold-heading mould, mould and fixed lower mould, its characterized in that on the punching press: the stamping upper die is provided with an upper die cavity, an inner conical surface is arranged on the periphery of the outer edge of the bottom end face of the stamping upper die, the fixed lower die comprises a lower die base and a die flap assembly, the lower die base is fixedly installed, the die flap assembly is formed by combining a plurality of independent die flaps, a spring hole is formed in the side face of each die flap, a spring is placed in the spring hole, the spring enables the die flaps to be in a circumferential opening state, when the compression spring enables each die flap to be in a circumferential closing state, a lower die cavity for forming a screw thread part is defined by the inner holes of each die flap together, the die flaps can be radially and movably arranged on the top end face of the lower die base, an outer conical surface is arranged on the outer edge of the top end; when the upper punching die descends to a proper position, the outer cone conical surface and the inner cone conical surface are in contact with each other well, so that the die sections are in a circumferential closed state. The utility model is used for the cold-heading shaping of screw rod, simple structure.

Description

Screw cold heading mould

Technical Field

The utility model relates to a cold-heading mould, concretely relates to screw rod cold-heading mould.

Background

At present, the fashioned screw rod part of cold-heading still often need carry out the machine tooling of screw thread, and the process is many, and production efficiency is low, if directly adopt the cold-heading mould to carry out the cold-heading shaping to the screw rod part's screw thread, the structure of so cold-heading mould can be comparatively complicated.

Disclosure of Invention

Not enough to prior art exists, the utility model aims at providing a screw rod cold-heading mould that is used for the cold-heading shaping of screw rod, simple structure.

The utility model discloses a realize through following technical scheme:

screw rod cold-heading mould, including mould and fixed lower mould in the punching press, the mould is made activity setting from top to bottom in the punching press, its characterized in that: the stamping upper die is provided with an upper die cavity, an inner conical surface is arranged on the periphery of the outer edge of the bottom end face of the stamping upper die, the fixed lower die comprises a lower die base and a die flap assembly, the lower die base is fixedly installed, the die flap assembly is formed by combining a plurality of independent die flaps, a spring hole is formed in the side face of each die flap, a spring is placed in the spring hole, the spring enables the die flaps to be in a circumferential opening state, when the compression spring enables each die flap to be in a circumferential closing state, a lower die cavity for forming a screw thread part is defined by the inner holes of each die flap together, the die flaps can be radially and movably arranged on the top end face of the lower die base, an outer conical surface is arranged on the outer edge of the top end; when the upper punching die descends to a proper position, the outer cone conical surface and the inner cone conical surface are in contact with each other well, so that the die sections are in a circumferential closed state.

According to the screw cold heading die in the technical scheme, during cold heading, the downward movement of the upper stamping die can enable the inner conical surface of the upper stamping die to simultaneously push the outer conical surfaces of the die sections, so that the die sections are drawn together towards the center of the fixed lower die until the upper stamping die descends in place, at the moment, the outer conical surfaces and the inner conical surfaces are in contact with each other properly, so that the die sections are in a circumferential closed state, a lower die cavity is formed completely, and the threaded part of the screw can be formed through direct cold heading; when the upper stamping die returns, the resilience of the spring enables the die sections to recover the circumferential opening state, and then the screw rod formed by cold heading is ejected upwards out of the lower die cavity under the action of the ejector rod behind the cold heading machine, so that the cold heading forming manufacturing of the threaded screw rod part is completed, and the structure is simple.

Preferably, the mold half assembly is formed by combining three mold halves with the same shape.

Preferably, the top end face of the lower die holder is provided with a limiting counter bore for limiting the opening degree of the circumference between the die segments, the bottom end face of each die segment is located in the limiting counter bore, the excircle of each die segment is provided with a guide groove, the top end face of the lower die holder is provided with a guide sheet, and the guide sheet is inserted into the guide groove to guide the radial movement of the die segments. The design structure simply realizes the opening control of the die section and the guide of the radial movement of the die section, so that the cold heading work can be smoothly realized.

Drawings

The utility model discloses there is following figure:

figure 1 is a schematic structural diagram of the present invention,

figure 2 is the utility model discloses the fashioned screw rod appearance map of cold-heading.

Detailed Description

As shown in figure 1, the screw cold heading die of the utility model comprises an upper stamping die 1 and a lower fixing die, wherein the upper stamping die 1 is movably arranged up and down, the upper stamping die 1 is provided with an upper die cavity 2, the periphery of the outer edge of the bottom end surface of the upper stamping die 1 is provided with an inner conical surface 9, the lower fixing die comprises a lower die holder 8 and a die assembly, the lower die holder 8 is fixedly arranged, the die assembly is formed by combining three die segments 4 with the same shape, the side surfaces of the die segments 4 are provided with spring holes 11, springs 12 are arranged in the spring holes 11, the springs 12 enable the die segments 4 to be in a circumferential opening state, when the compression springs 12 enable the die segments 4 to be in a circumferential closing state, the lower die cavity 3 for forming a screw thread part is jointly enclosed between the inner holes of the die segments 4, the die segments 4 can be radially movably arranged on the top end surface of the lower die holder 8, the top end surface of the lower die holder 8 is provided with, the bottom end face of the die piece 4 is positioned in the limiting counter bore 7, the excircle of the die piece 4 is provided with a guide groove 5, the top end face of the lower die holder 8 is fixedly provided with a guide sheet 6, the guide sheet 6 is inserted into the guide groove 5 to guide the radial movement of the die piece 4, the outer edge of the top end face of the die piece 4 is provided with an outer conical surface 10, and the outer conical surface 10 is matched with an inner conical surface 9; when the upper stamping die 1 descends to a proper position, the outer conical surface 10 and the inner conical surface 9 are in contact with each other, so that the die segments 4 are in a circumferential closed state. The utility model discloses the fashioned screw rod part's of cold-heading structure is shown in figure 2.

Claims

1. Screw rod cold-heading mould, including mould and fixed lower mould in the punching press, the mould is made activity setting from top to bottom in the punching press, its characterized in that: the stamping upper die is provided with an upper die cavity, an inner conical surface is arranged on the periphery of the outer edge of the bottom end face of the stamping upper die, the fixed lower die comprises a lower die base and a die flap assembly, the lower die base is fixedly installed, the die flap assembly is formed by combining a plurality of independent die flaps, a spring hole is formed in the side face of each die flap, a spring is placed in the spring hole, the spring enables the die flaps to be in a circumferential opening state, when the compression spring enables each die flap to be in a circumferential closing state, a lower die cavity for forming a screw thread part is defined by the inner holes of each die flap together, the die flaps can be radially and movably arranged on the top end face of the lower die base, an outer conical surface is arranged on the outer edge of the top end; when the upper punching die descends to a proper position, the outer cone conical surface and the inner cone conical surface are in contact with each other well, so that the die sections are in a circumferential closed state.

2. The screw cold heading die of claim 1, wherein: the mould lamella assembly is formed by combining three mould lamellas with the same shape.

3. The screw cold-heading die of claim 1 or 2, wherein: the die comprises a die base, a die cavity, a die cover, a die seat, a die cover, a die slide, a guide piece, a guide groove and a guide piece, wherein the die cover is arranged on the die cover, the die cover is arranged.