CN214919595U

CN214919595U - An extrusion device for countersunk head fasteners

Info

Publication number: CN214919595U
Application number: CN202121342649.3U
Authority: CN
Inventors: 郭力; 于洋; 皇万宇
Original assignee: Oriental Bluesky Titanium Technology Co ltd
Current assignee: Oriental Bluesky Titanium Technology Co ltd
Priority date: 2021-06-17
Filing date: 2021-06-17
Publication date: 2021-11-30
Anticipated expiration: 2031-06-17

Abstract

The utility model relates to the technical field of machining, in particular to an extrusion device for countersunk head fasteners, comprising a spinning head, a bracket and a plurality of rollers arranged below the spinning head, and the end of the bracket is provided with There is a groove, the roller is installed in the groove through a support shaft, the roller can rotate around the support shaft, and a plurality of the rollers are evenly distributed in the circumferential direction with the central axis of the spinning head as the axis. A space for accommodating the workpiece is formed, the outer edge of the roller is provided with two inclined surfaces arranged at an included angle, the included angle δ between the inclined surfaces is 100°-120°, and the intersection of the inclined surfaces is provided with arc. By setting the angle δ between the two inclined surfaces of the roller to 100°-120°, the force-bearing area of the workpiece during rolling is increased, and the performance of the workpiece is improved. At the same time, the stem and head of the workpiece are continuously corrected during rolling The size of the transition zone ensures that the amount of protrusion is within a controllable range, thereby improving the fatigue resistance of the fastener.

Description

Extrusion device for countersunk head fastener

Technical Field

The utility model relates to a machining technology field, concretely relates to extrusion device for countersunk head fastener.

Background

Fatigue performance is one of three great mechanical properties of a fastener and is crucial to the safety of an airplane. In the fatigue failure of the fastener, the head-shank junction is broken by 60%, and therefore, the fatigue fracture occurs because the head-shank junction is a stress concentration portion. The fillet position under the head of the fastener needs to be processed by cold extrusion strengthening, the size requirement of the transition area between the head and the rod of the fastener is ensured, the protrusion amount can not exceed 0.05mm, and larger force needs to be applied during cold extrusion strengthening so as to improve the fatigue resistance of the fastener.

After cold extrusion strengthening of an existing die machining product, the protruding size of a transition region between the head and the rod of a fastener is out of tolerance as shown in fig. 4, fatigue performance cannot be completely met, the head and the rod of the fastener are prone to being broken, and assembly of an airplane is affected. Because the manufacturing cost of aviation fasteners is high, the aviation fasteners are scrapped in a whole batch due to the fact that the aviation fasteners are out of tolerance in size or unqualified in fatigue performance, the waste of labor and raw materials is caused, the delivery time of products is delayed, the reputation of companies is greatly influenced, and the development of the companies is severely restricted.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to the problem of the protruding size out of tolerance of the fastener among the prior art, provide an extrusion device for countersunk head fastener.

The utility model provides an above-mentioned technical problem's technical scheme as follows: the utility model provides an extrusion device for countersunk head fastener, includes spinning head and support and a plurality of gyro wheel of setting in spinning head below, the tip of support is equipped with the recess, the gyro wheel passes through the back shaft and installs in the recess, the gyro wheel can rotate around the back shaft, and is a plurality of the center pin that the gyro wheel used spinning head is axle center circumference evenly distributed, and is a plurality of the gyro wheel forms the space that holds the work piece, the outer edge of gyro wheel is equipped with two inclined planes that are the contained angle setting, contained angle delta between the inclined plane is 100-120, the crossing department on inclined plane is equipped with the circular arc.

The utility model has the advantages that: the included angle delta between the two inclined planes of the roller is set to be 100-120 degrees, the stress area of a workpiece during rolling is increased, the performance of the workpiece is improved, the size of a transition area between the rod part and the head part of the workpiece is continuously corrected during rolling, so that the protruding amount is guaranteed to be within a controllable range, the fastener can apply larger force, the fatigue resistance performance of the fastener is improved, the assembly of an airplane is met, the fatigue resistance performance of the fastener is improved, and the safety of the airplane is improved.

On the basis of the technical scheme, the utility model discloses a reach the convenience of use and the stability of equipment, can also make following improvement to foretell technical scheme:

further, the radius R of the circular arc is 0.3mm-2 mm.

The beneficial effects of adopting above-mentioned further technical scheme are that, avoid the transition district of work piece pole portion and head to produce the arch, guarantee the smooth transition of pole portion and head, improve fatigue resistance.

Further, the arc is a semicircle.

The further technical scheme has the beneficial effects that the processing is convenient, and the arc and the inclined plane are in smooth transition.

Furthermore, the inclined surface and the end surface of the roller are in smooth transition.

The beneficial effect of adopting above-mentioned further technical scheme is, guarantee the dimensional requirement on work piece surface, avoid producing arch or recess when the roll extrusion.

Further, a through hole for accommodating the supporting shaft is formed in the center of the roller and is polished.

The beneficial effects of adopting above-mentioned further technical scheme are that, gyro wheel pivoted smoothness nature when guaranteeing the roll extrusion avoids taking place the uneven condition of work piece atress, improves rolling efficiency.

Furthermore, the number of the rollers is three, and the three rollers are obliquely arranged respectively.

The further technical scheme has the advantages that the workpiece is conveniently supported, and the stress uniformity of the workpiece is ensured.

Drawings

FIG. 1 is a schematic view of the extrusion apparatus of the present application;

FIG. 2 is a schematic structural view of a roller;

FIG. 3 is a schematic view of the workpiece A of FIG. 1 after machining;

FIG. 4 is a schematic view of a rear shank portion of a workpiece machined using a prior art technique;

the reference numbers are recorded as follows: 1. a spinning head; 2. a workpiece; 3. a roller; 4. a support; 5. a work table; 6. and supporting the shaft.

Detailed Description

The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.

Referring to fig. 1 to 3, an extrusion device for countersunk head fastener, including spinning head 1 and support 4 and a plurality of gyro wheel 3 of setting in spinning head 1 below, the tip of support 4 is equipped with the recess, gyro wheel 3 is installed in the recess through back shaft 6, gyro wheel 3 can rotate around back shaft 6, and is a plurality of gyro wheel 3 uses spinning head 1's center pin as axle center circumference evenly distributed, and is a plurality of gyro wheel 3 forms the space that holds work piece 2, gyro wheel 3 outer edge is equipped with two inclined planes that are the contained angle setting, and the contained angle delta between two inclined planes is 100-120, two the crossing department on inclined plane is equipped with the circular arc.

The workpiece 2 is a countersunk head fastener, and the bracket 4 is mounted on the workbench 5 for convenience in processing.

The recess is the U-shaped groove, in order to avoid gyro wheel 3 to take place to rock, takes place the problem of size discrepancy, the width looks adaptation in the thickness of gyro wheel 3 and U-shaped groove.

When the included angle delta between the two inclined planes is smaller than 100 degrees, the contact area between the roller 3 and the workpiece 2 is too small, the workpiece is easy to bulge in the processing process, so that the size of a transition area between the rod part and the head part is ultra-poor, the fatigue resistance of the fastener is reduced, and the assembly and use requirements of an airplane cannot be met; when the included angle delta between two inclined planes is greater than 120 degrees, the contact area between the roller 3 and the workpiece 2 is large, the spinning pressure of the spinning head 1 is increased, the size of the transition area is not easy to control, and the problem of size out-of-tolerance is easy to occur.

The circular arc is a semicircle, and the radius R of the circular arc is 0.3mm-2 mm.

In the embodiment, the workpiece 2 is a 100 ° countersunk head screw, the included angle δ between the two inclined surfaces of the roller 3 is 120 °, and the radius R of the circular arc is 0.5 mm.

The inclined surface and the end surface of the roller 3 are in smooth transition. And simultaneously, all sharp edges of the roller 3 are blunted, so that scratches on the surface of the workpiece when rolling are avoided, and the service life of the workpiece is influenced.

The center of the roller 3 is provided with a through hole for accommodating the supporting shaft 6, and the through hole is polished. The internal diameter of through-hole and the external diameter looks adaptation of back shaft 6 both guarantee that gyro wheel 3 normally rotates, avoid gyro wheel 3 to take place to rock simultaneously, influence the roll extrusion effect.

The rollers 3 are three, and the rollers 3 are respectively obliquely arranged to stably support the workpiece 2.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. An extrusion device for a countersunk head fastener, characterized in that it comprises a spinning head (1) and a bracket (4) and a plurality of rollers (3) arranged below the spinning head (1), The end of the bracket (4) is provided with a groove, the roller (3) is installed in the groove through the support shaft (6), the roller (3) can rotate around the support shaft (6), and a plurality of The rollers (3) are evenly distributed in the circumferential direction with the central axis of the spinning head (1) as the axis, and a plurality of the rollers (3) form a space for accommodating the workpiece (2). There are two inclined surfaces arranged at an included angle, the included angle δ between the inclined surfaces is 100°-120°, and an arc is provided at the intersection of the inclined surfaces.

2 . The extrusion device for countersunk head fasteners according to claim 1 , wherein the radius R of the arc is 0.3 mm-2 mm. 3 .

3. The extrusion device for a countersunk head fastener according to claim 1 or 2, wherein the arc is a semicircle.

4. The extrusion device for countersunk head fasteners according to claim 1, characterized in that the inclined surface and the end surface of the roller (3) have a smooth transition.

5 . The extrusion device for countersunk head fasteners according to claim 1 , wherein a through hole for accommodating the support shaft ( 6 ) is provided in the center of the roller ( 3 ). Polished.

6 . The extrusion device for countersunk head fasteners according to claim 1 , wherein there are three rollers ( 3 ), and the three rollers ( 3 ) are respectively arranged obliquely. 7 .