CN101850366A

CN101850366A - Cross wedge rolling die

Info

Publication number: CN101850366A
Application number: CN 201010174678
Authority: CN
Inventors: 黄金华
Original assignee: LIUZHOU HALF SHAFT AUTO PARTS Co Ltd
Current assignee: LIUZHOU HALF SHAFT AUTO PARTS Co Ltd
Priority date: 2010-05-18
Filing date: 2010-05-18
Publication date: 2010-10-06
Anticipated expiration: 2030-05-18
Also published as: CN101850366B

Abstract

The invention discloses a cross wedge rolling die, which is provided with a basal body and a shaping part raised from the outer surface of the basal body, the shaping part is provided with a wedging section, a broadening section and a trimming section, a wedging buffer section is also arranged between the wedging section and the broadening section of the shaping part, the outer side of the wedging buffer section consists of a lower outer side and an upper outer side connected with the lower outer side, the lower outer side of the wedging buffer section is the extended part of the outer side of the wedging section, and the inward inclination angle of the upper outer side of the wedging buffer section is smaller than the inward inclination angle of the outer side of the wedging section; the outer sides of the broadening section and the trimming section consist of an upper outer side and a lower outer side which are connected, the upper outer sides of the broadening section and the trimming section are the extended parts of the upper outer side of the wedging buffer section, and the lower outer sides of the broadening section and the trimming section are the extended parts of the outer side of the wedging section. Compared with the conventional cross wedge rolling die, the cross wedge rolling die breaks through the technical limitation that the cross wedge rolling technique cannot be used for rolling a cross section with a reduction up to 75 percent in the industry.

Description

Cross wedge rolling die

Technical field

The present invention relates to machinery manufacturing technology field, particularly a kind of mould that in the cross wedge rolling technology, is used to make slender axles.

Background technology

Cross wedge rolling technique is a kind of vanguard technology, this technology be with blank two identical do between the straight-line in opposite directions dull and stereotyped wedge type mould or rotatablely move in the same way two identical doing carry out the processing of cross rolling between the circular arc wedge shape mould, this processing technology not only obtains product size precision height, good product quality, but also have efficient characteristics, be usually used in the axial workpiece production line of batch.The key of cross wedge rolling technique is at cross wedge rolling die, this mould of the prior art is as going up disclosed " application of cross wedge rolling technique on connecting rod die forging production line " literary composition at " military project advanced manufacturing technology and through engineering approaches net " (http://www.diamt.net.cn/xjzzjs/gjjs/process/pf/pf-33.pdf), the mould of this a kind of technology is to be used to be contained in a pair of switched in opposite, the mould of using on the roll body of rotational synchronization, the mould of using on two roll bodies is identical, this mould has the body portion on the face of cylinder that basic inner surface and roll body outer surface match, this body portion is the toric planform of part often, be provided with the forming part of projection at the outer surface of body portion, described forming part be centered around matrix part above, the initiating terminal of forming part is most advanced and sophisticated, along initiating terminal is the part of broadening gradually backward, this protruding forming part is in the broadening of roll body axis direction, its protruding height is also increasing gradually, this forming section is divided into the wedging section from the initiating terminal to the clearing end, broadening section and neat section; In wedging section, inwardly protruded inclination angle, forming part two sides is α, and the top of wedging section is the camber line that upwards rises backward from initiating terminal of two sides intersection; In the broadening section, the side of forming part still is connected mutually with the side of wedging section, and its inclination angle is for still being α; At neat section, the top of lug boss is the arcwall face of rectangle, and this mould is typical cross wedge rolling die.

But, the use of this technology has limitation, in the operation of rolling, loosening may appear in inside, cracking even cavity, when the axle spare contraction percentage of area reaches or near 75% the time, just be easy to generate the phenomenon of boring, the applicant is 74.2% o'clock in the rolling contraction percentage of area, its percent defective is unexpectedly up to about 5%, it has been the technological limits of this industry that the contraction percentage of area can not surpass 75%, China Machine Press publish " (publication date is on September 1st, 2003 to practical forging technology handbook, publication number is ISBN:7111117948) chapter 11 cross wedge rolling system introduces in the technical scheme, when the diameter of the rolling front and back of compression ratio δ ≧ 2(of blank than) time (contraction percentage of area γ ≦ 75%) hollow for anti-stopping bar portion, break and undergauge, can adopt two passages rolling.But this reroll is unsuitable for the rolling of elongate articles, and elongate articles adopts rolling inside, two roads still can loosen, ftracture and the cavity in this case.

Summary of the invention

Technical problem to be solved by this invention provides the high cross wedge rolling die of a kind of slender axles distortion diameter reducing rate.

In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is: this cross wedge rolling die, has body portion and at the moulding section of the convex outer surfaces of this body portion, described forming part has the wedging section, broadening section and neat section, described forming part is wedged breeze way in addition between wedging section and broadening section, the lateral surface of this section is made of with the superolateral surface that is connected with this inferolateral surface inferolateral surface, its inferolateral surface is the part of described wedging section lateral surface continuity, the leaning angle of this inferolateral surface is A1,30 °≤A1≤45 °, the leaning angle of the superolateral surface of described wedging breeze way is A2,12 °≤A2≤17 °, the top of described wedging breeze way is the superolateral surface engaging portion by two introversions; Described broadening section and described neat section lateral surface all are to be connected and composed by superolateral surface and inferolateral surface, and their superolateral surface all is the part of described wedging breeze way superolateral surface continuity, and their inferolateral surface all is the part of described wedging section lateral surface continuity

In the technique scheme, scheme can be more specifically: the angle of spread of described forming part is W, 9 °≤B≤12 °; The leaning angle A1 of the preferably described wedging section of the value of each parameter side is 30 ° in the such scheme, and the leaning angle A2 of described wedging breeze way side is 15 °, and the angle of spread W of described forming part is 9 °.

In the various composition forms of technique scheme, described matrix part can be that torus also can put down is plate body, on these matrix parts, generally be provided with the installing hole that is connected with rolling mill, described matrix part and on forming part can be an integral body, also can be that the multistage split engage to constitute.

Owing to adopted technique scheme, the present invention compared with prior art, the beneficial effect that has is:

1, effectively solve slender axles operation of rolling king-rod portion and produce hollow quality problems, percent defective greatly reduces.Two kinds of semiaxis with the minicar that the applicant was produced are example, these two kinds of its contraction percentages of area of semiaxis are a kind of to be that 75% another kind is 74.2% to be 5% from adopting the percent defective before this enforcement New Scheme, has adopted the percent defective after the solution of the present invention all to be reduced to below 0.2%;

2, reduce the stress of the workpiece operation of rolling after, the reaction force that mould is subjected to also reduces, the profile wearing and tearing of the forming part that mould protrudes reduce corresponding prolongation 30% die life thereupon.

Description of drawings

Fig. 1 is an embodiment of the invention operation principle schematic diagram;

Fig. 2 is an embodiment of the invention deployed configuration schematic diagram;

Fig. 3 is the cutaway view at F-F place among Fig. 2;

Fig. 4 is the partial enlarged view at K place among Fig. 3;

Fig. 5 is the cutaway view at G-G place among Fig. 2;

Fig. 6 is the partial enlarged view at M place among Fig. 5;

Fig. 7 is the cutaway view at H-H place among Fig. 2;

Fig. 8 is the partial enlarged view at N place among Fig. 7;

Fig. 9 is the cutaway view at I-I place among Fig. 2;

Figure 10 is the partial enlarged view at O place among Fig. 9.

The specific embodiment

Below in conjunction with the accompanying drawing example, the invention will be further described:

Embodiment 1:

This cross wedge rolling die shown in Figure 1, have two secondary identical parts in use, a pair wherein is contained on the roll 1, this secondary mould by piece 2, piece 3, piece 4 and piece 5 totally four parts be contained in to engage on the roll 1 by screw and constitute, piece 2, piece 3, piece 4 and piece 5 all have one section matrix part in the torus, are raised with forming part on matrix part.

The deployed configuration of piece 2, piece 3, piece 4 and piece 5 is equipped with above each piece and is used for the screw hole that is connected with rolling equipment as shown in Figure 2, and its angle of spread W is 9 °.

The part of the L1 section in piece 2 is the wedging section, and this section is identical with the wedging section of prior art, and the leaning angle A1 of its forming part two lateral surfaces is 45 °, and its cross-section structure as shown in Figure 3, Figure 4.

The part of the L2 section in piece 2 is the wedging breeze way, the superolateral surface that two lateral surfaces of this section have inferolateral surface and are attached thereto, wherein inferolateral surface is the part of wedging section lateral surface continuity, its leaning angle A1 is 45 °, the leaning angle A2 of the superolateral surface of wedging breeze way is 17 °, its cross-section structure such as Fig. 5, shown in Figure 6.

Back segment at piece 2, L3 in the leading portion of 34 of pieces and piece 5 partly is the broadening section, the lateral surface of broadening section also is to be connected and composed by superolateral surface and inferolateral surface, its superolateral surface is the part of the superolateral surface continuity of wedging breeze way, its leaning angle A2 is 17 °, its inferolateral surface is the part of wedging section lateral surface continuity, and its leaning angle A1 is 45 °, its cross-section structure such as Fig. 7, shown in Figure 8.

L4 in piece 5 partly is neat section, the lateral surface of neat section also is to be connected and composed by superolateral surface and inferolateral surface, its superolateral surface is the part of the superolateral surface continuity of wedging breeze way, its leaning angle A2 is 17 °, its inferolateral surface is the part of wedging section lateral surface continuity, its leaning angle A1 is 45 °, its cross-section structure such as Fig. 9, shown in Figure 10.

The applicant is through test, with prior art with diameter be 60 blank to be rolled into diameter be 30 millimeters, length be 410 millimeters sections to add diameter be 40 millimeters, when length is the slender axles of 170 millimeters sections, have to surpass 20% manufactured goods, occur loose, cracking or empty in it; And after adopting the technical scheme of present embodiment, can overcome above-mentioned phenomenon, and even be 30 ° when the present invention may wear to above-mentioned leaning angle A1, A2 is taken as 12 ° when spending, and can keep still that loosening does not appear in core, cracking even cavitation.

In another embodiment, removing the angle of spread is 12 °, the mould that other parts are same as the previously described embodiments, with diameter is that to be rolled into diameter be 33 millimeters for 65 blank, length is that to add diameter be 42 millimeters to 460 millimeters sections, when length is the slender axles of 202 millimeters sections, still can obtain identical technique effect.

Claims

1. cross wedge rolling die, has body portion and at the moulding section of the convex outer surfaces of this body portion, described forming part has the wedging section, broadening section and neat section, it is characterized in that: described forming part is wedged breeze way in addition between wedging section and broadening section, the lateral surface of this section is made of with the superolateral surface that is connected with this inferolateral surface inferolateral surface, its inferolateral surface is the part of described wedging section lateral surface continuity, the leaning angle of this inferolateral surface is A1,30 °≤A1≤45 °, the leaning angle of the superolateral surface of described wedging breeze way is A2,12 °≤A2≤17 °, the top of described wedging breeze way is the superolateral surface engaging portion by two introversions; Described broadening section and described neat section lateral surface all are to be connected and composed by superolateral surface and inferolateral surface, their superolateral surface all is the part of described wedging breeze way superolateral surface continuity, and their inferolateral surface all is the part of described wedging section lateral surface continuity.

2. cross wedge rolling die according to claim 1 is characterized in that: the angle of spread of described forming part is W, 9 °≤B≤12 °.

3. cross wedge rolling die according to claim 1 and 2 is characterized in that: the leaning angle A1 of described wedging section side is 30 °, and the leaning angle A2 of described wedging breeze way side is 15 °, and the angle of spread W of described forming part is 9 °.

4. cross wedge rolling die according to claim 1 and 2 is characterized in that: described matrix part is a torus, is provided with the installing hole that is connected with rolling mill on this torus.

5. cross wedge rolling die according to claim 3 is characterized in that: described matrix part is a torus, is provided with the installing hole that is connected with rolling mill on this torus.

6. cross wedge rolling die according to claim 4 is characterized in that: described matrix part and on forming part engage by multistage and constitute.

7. cross wedge rolling die according to claim 5 is characterized in that: described matrix part and on forming part engage by multistage and constitute.

8. cross wedge rolling die according to claim 1 and 2 is characterized in that: described matrix part is a plate body, and described plate body is provided with the installing hole that is connected with rolling mill.

9. cross wedge rolling die according to claim 3 is characterized in that: described matrix part is a plate body, and described plate body is provided with the installing hole that is connected with rolling mill.