CN102172815B

CN102172815B - Hot extrusion forming method for inner hexagonal bolt blank of titanium alloy

Info

Publication number: CN102172815B
Application number: CN2011100091863A
Authority: CN
Inventors: 陈威; 朱磊; 谭佃龙; 李吉峰; 冯云; 汤秀山
Original assignee: JIANGYIN DONGDA NEW MATERIAL INSTITUTE
Current assignee: JIANGYIN DONGDA NEW MATERIAL INSTITUTE
Priority date: 2011-01-17
Filing date: 2011-01-17
Publication date: 2012-11-21
Anticipated expiration: 2031-01-17
Also published as: CN102172815A

Abstract

The invention relates to a hot extrusion forming method for a titanium alloy fastener, in particular to a hot extrusion forming method for an inner hexagonal bolt blank of a titanium alloy, which belongs to the technical field of plastic processing and forming for metal pieces. The hot extrusion forming method for an inner hexagonal bolt blank of a titanium alloy comprises the following technological processes of: (1) feeding; (2) heating the blank; (3) preheating a heading mould; (4) heading; (5) preheating a punching mould; and (6) punching. The hot extrusion forming method for an inner hexagonal bolt blank of a titanium alloy can effectively solve the problem that an inner hexagonal bolt blank of a titanium alloy with a larger length-to-diameter ratio is difficult to form by plastic processing, and can meet the needs of the mass production of the inner hexagonal bolt blank of a titanium alloy.

Description

The thermal extrusion moulding method of titanium alloy hexagon socket head cap screw blank

Technical field

The present invention relates to a kind of thermal extrusion moulding method of titanium alloy fastener, especially relate to a kind of thermal extrusion moulding method of titanium alloy hexagon socket head cap screw blank, belong to the Metal Forming technical field.

Background technology

Titanium alloy fastener is used more and more widely in space flight, aviation, navigation and military field because its proportion is little, specific strength is high and advantage such as corrosion resistance and good.Accompanying drawing 1 is a kind of titanium alloy hexagon socket head cap screw sketch map, and its blank is as shown in Figure 2.The hexagon socket head cap screw blank of common iron material generally adopts hot-extrusion method to be shaped; But because the titanium alloy high-temperature resistance of deformation is big; Material flowability is poor, and the titanium alloy hexagon socket head cap screw blank that draw ratio is bigger is difficult to be shaped with conventional plastic processing method, therefore; Extrusion die reasonable in design, the rational extrusion forming process parameter of selection are the technical problems that solution is badly in need of in such part Plastic Forming.

Summary of the invention

The objective of the invention is to overcome above-mentioned deficiency, a kind of thermal extrusion moulding method that is applicable to that titanium alloy hexagon socket head cap screw blank is produced in enormous quantities is provided.

A kind of thermal extrusion moulding method of titanium alloy hexagon socket head cap screw blank is characterized in that: said method comprises following technical process:

(1) blanking: get a titanium alloy bar, on sawing machine, be cut into blank;

(2) heating blank: blank is put into cabinet-type electric furnace heat, heating-up temperature is 960 ℃ ± 10 ℃, is incubated 15 minutes ± 5 minutes;

(3) preheating heading mould: get a heading mould and carry out preheating, preheat temperature is 200 ~ 240 ℃, is incubated 1 hour ± 0.5 hour;

(4) heading: the blank after will heating is put into the heading mould die through preheating, carries out the heading extruding, and each decrement is no more than material plasticity allowed band during heading;

(5) preheating punching die: get a punching die and carry out preheating, preheat temperature is 200 ~ 240 ℃, is incubated 1 hour ± 0.5 hour;

(6) punching: with putting into the punching die die through preheating after blank heating behind the heading and the insulation, the hot impact extrusion of carrying out inner hexagonal hole is shaped.

Said heading mould comprises upper plate I, and said upper plate I lower surface is set with fixed plate I, and the fixed plate I center has shoulder hole; Be provided with the heading punch in the fixed plate I central stepped, heading punch below is provided with die socket I, and die socket I center is provided with the heading die; Heading die and die socket I link together through steady pin I; Blank is placed in the heading die, is provided with top thick stick I in the heading die of blank below and the die socket I, and die socket I below is provided with base I; Base I center is provided with top thick stick II; Top thick stick II is positioned at the below of top thick stick I, and said heading punch, blank, top thick stick I and top thick stick II are positioned on the same center line, and upper plate I is connected with the workbench of forcing press with set bolt II through set bolt I respectively with base I.

Said punching die comprises upper plate II, and said upper plate II lower surface is set with fixed plates II, and the fixed plates II center has shoulder hole; Be provided with piercing punch in the fixed plates II central stepped; The piercing punch center is provided with die socket II, and die socket II center is provided with punching concave die, and said punching concave die head is conical; Its coning angle is 50 ° ~ 60 °; Punching concave die and die socket II link together through steady pin II, and the blank behind the heading is in heating is placed on punching concave die, and the punching concave die and the die socket II center of the blank below behind the heading all have through hole; Die socket II below is provided with base II; Base II center also has through hole, and the blank behind said piercing punch, the heading, punching concave die and base II are in the same center line, and upper plate II is connected with the workbench of forcing press with set bolt IV through set bolt III respectively with base II.

Compared with prior art, the invention has the beneficial effects as follows:

The thermal extrusion moulding method of a kind of titanium alloy hexagon socket head cap screw of the present invention blank; Can solve the bigger titanium alloy hexagon socket head cap screw blank of draw ratio effectively and be difficult to problem, can satisfy the requirements of large-scale production of titanium alloy hexagon socket head cap screw blank through the plastic working shaping.

Description of drawings

Fig. 1 is a kind of structural representation of titanium alloy hexagon socket head cap screw.

Fig. 2 is a kind of structural representation of titanium alloy hexagon socket head cap screw blank.

Fig. 3 is the structural representation of heading mould of the present invention.

Fig. 4 is the structural representation of punching die of the present invention.

Wherein:

Upper plate I1, set bolt I2, fixed plate I 3, bolt I4, heading punch 5, blank 6, steady pin I7; Heading die 8; Die socket I9, top thick stick I10, base I11; Top thick stick II12, set bolt II13, the blank 106 behind upper plate II101, set bolt III102, fixed plates II 103, bolt II104, piercing punch 105, the heading, steady pin II107, punching concave die 108, die socket II109, base II110, set bolt IV111.

The specific embodiment

A kind of hot-extrusion method of titanium alloy hexagon socket head cap screw blank, said method comprises following technical process:

1, blanking: get the titanium alloy bar of a Ф 27mm, on sawing machine, be cut into the blank of length 45mm, and ground surface defective and burr.

2, heating blank: blank is put into cabinet-type electric furnace heat, heating-up temperature is 960 ℃ ± 10 ℃, is incubated 15 minutes ± 5 minutes.

3, preheating heading mould: get a heading mould and carry out the electrical heating preheating by regulation, preheat temperature is 200 ~ 240 ℃, is incubated 1 hour ± 0.5 hour.

4, heading: will carry out the heading extruding through the heading mould die after the blank of heating is put into preheating, each decrement is no more than material plasticity allowed band during heading.

5, preheating punching die: get a punching die and carry out the electrical heating preheating by regulation, preheat temperature is 200 ~ 240 ℃, is incubated 1 hour ± 0.5 hour.

6, punching: the blank behind the heading is put into the punching die die after the preheating, and the hot impact extrusion of carrying out inner hexagonal hole is shaped.

7, check:, in time the hitting power and the cycle of heading mould and punching die are revised according to the assay of blank after the punching.

Referring to Fig. 3, Fig. 3 is the structural representation of heading mould of the present invention, can be found out by Fig. 3; Said heading mould comprises upper plate I1, and said upper plate I1 lower surface is set with fixed plate I 3, and fixed plate I 3 centers have shoulder hole; Be provided with heading punch 5 in fixed plate I 3 central stepped, heading punch 5 belows are provided with die socket I9, and die socket I9 center is provided with heading die 8; Heading die 8 is connected through steady pin I7 with die socket I9; Blank 6 is placed in the heading die 8, is provided with top thick stick I10 in the heading die 8 of blank 6 belows and the die socket I9, and die socket I9 below is provided with base I11; Base I11 center is provided with top thick stick II12; Top thick stick II12 is positioned at the below of top thick stick I10, and said heading punch 5, blank 6, top thick stick I10 and top thick stick II12 are positioned on the same center line, and upper plate I1 is connected with the workbench of forcing press with set bolt II13 through set bolt I2 respectively with base I11.

Referring to Fig. 4, Fig. 4 is the structural representation of punching die of the present invention, can be found out by Fig. 4; Said punching die comprises upper plate II101, and said upper plate II101 lower surface is set with fixed plates II 103, and fixed plates II 103 centers have shoulder hole; Be provided with piercing punch 105 in fixed plates II 103 central stepped; Piercing punch 105 centers are provided with die socket II109, and die socket II109 center is provided with punching concave die 108, and said punching concave die 108 heads are conical; Its coning angle is 50 ° ~ 60 °; Punching concave die 108 links together through steady pin II107 with die socket II109, and the blank 106 behind the heading is placed in the punching concave die 108, and the punching concave die 108 and the die socket II109 center of blank 106 belows behind the heading all have through hole; Die socket II109 below is provided with base II110; Base II110 center also has through hole, and blank 106, punching concave die 108 and base II110 behind said piercing punch 105, the heading are in the same center line, and upper plate II101 is connected with the workbench of forcing press with set bolt IV111 through set bolt III102 respectively with base II110.

Claims

1. the thermal extrusion moulding method of a titanium alloy hexagon socket head cap screw blank, it is characterized in that: said method comprises following technical process:

(1) blanking: get a titanium alloy bar, on sawing machine, be cut into blank;

(4) heading: the blank after will heating is put into the heading mould die after the preheating, carries out the heading extruding, and each decrement is no more than material plasticity allowed band during heading;

(6) punching: with the punching die die of the blank behind the heading after putting into preheating after heating and the insulation, the hot impact extrusion of carrying out inner hexagonal hole is shaped;

Said heading mould comprises upper plate I (1); Said upper plate I (1) lower surface is provided with fixed plate I (3), and fixed plate I (3) center has shoulder hole, is provided with heading punch (5) in fixed plate I (3) central stepped; Heading punch (5) below is provided with die socket I (9); Die socket I (9) center is provided with heading die (8), and heading die (8) is connected through steady pin I (7) with die socket I (9), and blank (6) is placed in the heading die (8); Be provided with top thick stick I (10) in the heading die (8) of blank (6) below and the die socket I (9); Die socket I (9) below is provided with base I (11), and base I (11) center is provided with top thick stick II (12), and top thick stick II (12) is positioned at the below of top thick stick I (10); Said heading punch (5), blank (6), top thick stick I (10) and top thick stick II (12) are positioned on the same center line, and upper plate I (1) is connected with the workbench of forcing press with set bolt II (13) through set bolt I (2) respectively with base I (11).

2. the thermal extrusion moulding method of a kind of titanium alloy hexagon socket head cap screw blank according to claim 1; It is characterized in that: said punching die comprises upper plate II (101); Said upper plate II (101) lower surface is set with fixed plates II (103); Fixed plates II (103) center has shoulder hole, is provided with piercing punch (105) in fixed plates II (103) central stepped, and piercing punch (105) center is provided with die socket II (109); Die socket II (109) center is provided with punching concave die (108); Said punching concave die (108) head is conical, and its coning angle is 50 ° ~ 60 °, and punching concave die (108) links together through steady pin II (107) with die socket II (109); Blank behind the heading (106) is placed in the punching concave die (108); The punching concave die (108) of the blank behind the heading (106) below all has through hole with die socket II (109) center, and die socket II (109) below is provided with base II (110), and base II (110) center also has through hole; Blank (106) behind said piercing punch (105), the heading, punching concave die (108) and base II (110) are in the same center line, and upper plate II (101) is connected with the workbench of forcing press with set bolt IV (111) through set bolt III (102) respectively with base II (110).