CN115401413A

CN115401413A - Contact pin chamfering production method

Info

Publication number: CN115401413A
Application number: CN202211027351.2A
Authority: CN
Inventors: 沈佳茂; 汪乐
Original assignee: Cixi Boheng Auto Parts Co ltd
Current assignee: Cixi Boheng Auto Parts Co ltd
Priority date: 2022-08-25
Filing date: 2022-08-25
Publication date: 2022-11-29
Anticipated expiration: 2042-08-25
Also published as: CN115401413B

Abstract

The invention relates to a pin chamfering production method, which comprises the steps of positioning the position of a pin in a flat plate part through a pre-punched blank, simultaneously, after preliminarily determining the overall size of the pin, in the next procedure, forming an oblique notch for reducing the meat expansion amount generated by extrusion in the subsequent procedure in the pre-punched blank, then, carrying out multiple fine cutting on the long strip-shaped blank to obtain a pin semi-finished product with a three-side chamfer at the head part so as to improve the shaping effect of the chamfer head part of the pin, and then, pressurizing the pin semi-finished product through two punches with opposite extrusion directions.

Description

Contact pin chamfering production method

Technical Field

The invention relates to the field of pin processing, in particular to a pin chamfering production method.

Background

In the prior art, the pin production method is as follows: generally, after a flat plate is subjected to one or more times of fine machining, after the outer contour of a machined contact pin is obtained preliminarily, a punch or a punch is adopted to press a blank placed in a female die to form a double-sided chamfer, but in the extrusion step of the double-sided chamfer in the current actual production process, the situations that the length of the contact pin is difficult to control, the width size of the contact pin is difficult to control and the like can occur.

Disclosure of Invention

In order to solve the problems, the invention provides a pin chamfering production method capable of effectively controlling the length and the width of a product.

In order to achieve the purpose, the pin chamfering production method comprises the following production procedures:

a. driving a male die to perform pre-stamping on the flat plate piece through a press machine to obtain a blank with the required diameter size;

b. pre-forming an oblique notch in the middle section of the obtained blank for reducing the meat expansion amount caused by extrusion in the bilateral chamfering process;

c. further carrying out one or more times of finish machining on the obtained blank according to the position of the oblique notch to obtain a semi-finished pin which meets the precision requirement of the product;

d. and driving a punch to extrude one end of the obtained semi-finished pin close to the oblique notch of the semi-finished pin by a press machine to obtain a finished pin with a smooth chamfer head and no obvious burr.

According to the scheme, the position of the contact pin in the flat plate piece is positioned through the blank punched in advance, an oblique notch is formed in the blank punched in advance in the next process, and one or more times of fine machining treatment is carried out on the length and the width of the blank, so that the length and the width of the contact pin are ensured, and the conditions that the expansion of the section of the chamfer head of the contact pin is difficult to control due to the extrusion of a punch in the subsequent process are reduced.

The blank obtained in the step a is specifically a long strip-shaped blank extending along the horizontal direction, and the diameter size of the long strip-shaped blank should be larger than the diameter sizes of the semi-finished pin and the finished pin.

Through the diameter size be greater than the rectangular form blank of contact pin after the finish machining processing in above-mentioned scheme, effectively manage and control the length and the width of contact pin.

In a further scheme, the oblique notch formed in the step b is a V-shaped opening arranged in the middle section of the upper end face of the blank.

In the scheme, the punch is driven by the press machine to be pre-extruded out of the V-shaped opening in the middle section of the long-strip-shaped blank, so that the meat expansion amount caused by extrusion in the subsequent bilateral chamfering process is reduced.

Further, the two groups of inclined surfaces in the V-shaped oblique notches have different inclinations, wherein the inclination of one group of inclined surfaces is greater than or equal to the inclination of the end chamfer surface of the finished pin.

Through the inclined plane that above-mentioned range of inclination is greater than or equal to chamfer face range of inclination in the above-mentioned scheme, when further reducing the meat volume that rises that produces because the extrusion in the follow-up bilateral chamfer process, when still driving the punch through the press and extrude downwards, the shorter a set of inclined plane of length of inclining in the V-arrangement opening that produces tentatively prescribes a limit to the length specification of contact pin, reduces the thickness that needs to cut off the part in the rectangular form blank simultaneously to promote follow-up earnestly efficiency.

In a further aspect, the finish machining performed on the blank with the oblique cut in step c further includes:

c-1, cutting off the part of the obtained strip blank, which exceeds the oblique notch of the strip blank;

c-2, cutting off the material of the strip blank with the diameter exceeding the semi-finished pin or the finished pin part;

c-3, performing primary double-sided cutting chamfering on the end faces of the left side and the right side of one end, close to the oblique notch, of the obtained strip blank.

According to the scheme, the length and the width of the contact pin are further determined by cutting off the material of the part, exceeding the semi-finished product of the contact pin, of the strip-shaped blank, and then the head of the semi-finished product of the contact pin is subjected to left and right double-sided chamfering, so that the reshaping effect of the chamfered head of the contact pin is ensured.

A further scheme is that the pressing machine drives the punches to extrude the semi-finished pin through two punches with opposite extrusion directions, the two punches are close to each other towards the axis of the semi-finished pin, and an upper-lower double-sided chamfer is formed at one end of the semi-finished pin, which is close to the oblique notch.

In the scheme, the semi-finished inserting needle is pressurized by the two punches with opposite extrusion directions, the metal flowing direction is vertical to the advancing direction of the punches, and the metal flowing mode can minimize the difference of the longitudinal mechanical properties of the head of the inserting needle, has larger deformation degree and can ensure that the inserting needle obtains higher strength.

The invention discloses a pin chamfering production method, which comprises the steps of positioning the position of a pin in a flat plate part through a pre-punched blank, simultaneously, after preliminarily determining the integral size of the pin, in the next procedure, forming an oblique notch for reducing the meat expansion amount generated by extrusion in the subsequent procedure in the pre-punched blank, then, carrying out multiple fine cutting on the long strip-shaped blank to obtain a pin semi-finished product with a three-side chamfer at the head part so as to improve the shaping effect of the pin chamfer head part, and then, pressurizing the pin semi-finished product through two punches with opposite extrusion directions.

In conclusion, the method has the advantages that the length and the width of the product can be effectively controlled, the shaping effect is good, meanwhile, the operation in the whole processing process is simple and rapid, the processing efficiency is high, the quality is high, and a large amount of manpower and material resources are saved.

Drawings

Fig. 1 is a top view of a pin chamfer forming die.

Fig. 2 is a schematic view of the male mold in step a.

FIG. 3 is a schematic representation of the blank obtained in step a.

Fig. 4 is a schematic view of the male mold in step b.

FIG. 5 is a schematic representation of the blank obtained in step b.

Fig. 6 is a diagram showing the step of blank finishing in step C.

Fig. 7 is a schematic view of the pin blank obtained in step C.

Fig. 8 is a schematic view of the male mold in step d.

Fig. 9 is a schematic diagram of the pin completed product obtained in step d.

Detailed Description

To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, characteristics and effects according to the present invention will be made with reference to the accompanying drawings and preferred embodiments.

Example 1.

As shown in fig. 1, 2, 4, 6 and 8, the pin chamfering method described in this embodiment includes the following steps:

a. driving a male die to perform pre-stamping on the flat plate member 1 through a press machine to obtain a blank 2 with the required diameter size;

b. an oblique notch 3 for reducing the meat expansion amount generated by extrusion in the bilateral chamfering process is pre-arranged at the middle section of the obtained blank 2;

c. further carrying out one or more times of fine machining on the obtained blank 2 according to the position of the oblique notch 3 to obtain a contact pin semi-finished product 4 meeting the product precision requirement;

d. and (3) driving a punch to extrude one end of the obtained semi-finished pin 4 close to the oblique notch 3 by a press machine to obtain a finished pin 5 with a smooth chamfer head and no obvious burr.

As shown in fig. 3, the blank 2 obtained in step a is specifically an elongated blank 2 extending in the horizontal direction, and the diameter of the elongated blank 2 should be larger than the diameter of the semi-finished pin 4 and the diameter of the finished pin 5.

As shown in fig. 5, the oblique cuts 3 made in step b are specifically V-shaped openings arranged at the middle sections of the upper end surfaces of the blanks 2, the two groups of inclined surfaces 6 in the V-shaped oblique cuts 3 have different inclinations, and the inclination of one group of inclined surfaces 6 is greater than or equal to the inclination of the end chamfer surfaces 7 of the finished pin 5.

As shown in fig. 7, the step c of finishing the blank 2 with the oblique cut 3 further includes:

c-1, cutting off the part of the obtained strip blank 2, which exceeds the oblique notch 3;

c-2, cutting off the material of the part of the strip blank 2 with the diameter exceeding the semi-finished pin product 4 or the finished pin product 5;

c-3, performing primary double-sided cutting chamfering on the left and right end faces of one end of the obtained strip blank 2 close to the oblique notch 3.

As shown in fig. 9, the step d of pressing by the press machine drives the punches to press, specifically, two punches with opposite pressing directions are close to each other toward the axis of the semi-finished pin 4, and an upper-lower double-sided chamfer is formed at one end of the semi-finished pin 4 close to the oblique notch 3.

The foregoing is illustrative of the preferred embodiments of the present invention and is not to be construed as limiting thereof, although the invention is described in detail in the context of the preferred embodiments and is not intended to be limited thereto. Equivalent embodiments having equivalent variations can be made by those skilled in the art without departing from the scope of the present invention, and any brief modifications, equivalent variations and modifications made to the above embodiments according to the technical essence of the present invention still fall within the scope of the present invention.

Claims

1. The production method of the contact pin chamfer is characterized by comprising the following production processes:

a. driving a male die to perform pre-stamping on the flat plate piece (1) through a press machine to obtain a blank (2) with the required diameter and size;

b. an oblique notch (3) for reducing the meat expansion amount generated by extrusion in the double-side chamfering process is pre-arranged at the middle section of the obtained blank (2);

c. further carrying out one or more times of fine machining on the obtained blank (2) according to the position of the oblique notch (3) to obtain a semi-finished pin (4) meeting the precision requirement of a product;

d. and (3) driving a punch to extrude one end of the obtained semi-finished pin (4) close to the oblique notch (3) through a press machine to obtain a finished pin (5) with a smooth chamfered head and no obvious burr.

2. A pin chamfering production method according to claim 1, wherein the blank (2) obtained in step a is embodied as an elongated blank (2) extending in a horizontal direction, and the diameter dimension of the elongated blank (2) is larger than the diameter dimensions of the pin semi-finished product (4) and the pin finished product (5).

3. A pin chamfering production method as claimed in claim 1, wherein the oblique cut (3) made in step b is embodied as a V-shaped opening provided in the middle section of the upper end face of the blank (2).

4. A pin chamfer production method according to claim 3, characterized in that the two sets of inclined surfaces (6) in the V-shaped oblique cuts (3) have different inclinations, wherein the inclination of one set of inclined surfaces (6) is greater than or equal to the inclination of the end chamfer surface (7) of the pin finished product (5). The oblique incision is described further.

5. A pin chamfering production method according to any one of claims 1 to 4, wherein the finish machining of the blank (2) provided with the oblique cut (3) in step c further comprises:

c-1, cutting off the part of the obtained strip blank (2) which exceeds the oblique notch (3) of the strip blank; c-2, cutting off the material of the part of the long strip blank (2) with the diameter exceeding the semi-finished pin (4) or the finished pin (5);

c-3, performing primary double-sided cutting chamfering on the end faces of the left side and the right side of one end, close to the oblique notch (3), of the obtained strip-shaped blank (2).

6. The pin chamfering production method according to claim 5, wherein the pressing machine drives the punches to extrude the pin specifically through two punches with opposite extrusion directions, the punches are close to each other towards the axis of the pin semi-finished product (4), and a double-sided chamfer with one upper chamfer and one lower chamfer is formed at one end of the pin semi-finished product (4) close to the oblique notch (3).