CN105618583A

CN105618583A - Drawing concave die and method for drawing gear shift shaft sleeve through drawing concave die

Info

Publication number: CN105618583A
Application number: CN201610071961.0A
Authority: CN
Inventors: 吴伟民
Original assignee: SUZHOU PRO-SUCCESS AUTOMOTIVE STAMPING Co Ltd
Current assignee: SUZHOU PRO-SUCCESS AUTOMOTIVE STAMPING Co Ltd
Priority date: 2016-02-02
Filing date: 2016-02-02
Publication date: 2016-06-01

Abstract

The invention relates to the field of drawing concave dies and discloses a drawing concave die and a method for drawing a gear shift shaft sleeve through the drawing concave die. The drawing concave die comprises a concave die body (1) and a drawing hole (2). A drawing oblique angle (3) is formed at the joint of the top end of the inner side wall of the drawing hole and the upper end face of the concave die body. Compared with the prior art, the drawing concave die has the drawing oblique angle, so that in the drawing process of a material slice of the gear shift shaft sleeve, the drawing oblique angle enables the material slice to make surface contact with the drawing oblique angle; compared with point contact between a material slice and a drawing angle in the prior art, the surface contact mode enables the material slice to stably enter the drawing hole, the galling phenomenon is relieved, and the cracking proportion is reduced; due to surface contact, the change of the thickness of the material slice is easily controlled, and the situation that the material slice is quickly thinned in the early stage of drawing is avoided; after the material slice is drawn into the finished gear shift shaft sleeve, the product surface cannot crack even if the gear shift shaft sleeve is stored for a long time, and the safety performance of the gear shift shaft sleeve in use is guaranteed.

Description

Stretch die and the method for stretching gearshift axle sleeve thereof

Technical field

The present invention relates to stretching die field, stretch die and the method for stretching gearshift axle sleeve thereof particularly to a kind of.

Background technology

Automobile gear shift axle sleeve is critically important to automobile gearshift in the process of moving, owing to the material of axle sleeve of shifting gears is stainless steel material, hardness is bigger, in its stretch forming process, there will be automatic cracking phenomena particularly in stretching after end forms finished product a period of time, have a strong impact on the result of use of gearshift axle sleeve.

It is currently used in the mould of drawing and forming gearshift axle sleeve, stretching angle between upper surface and the stretchable holes medial wall of die main body is right angle, such as Fig. 1, this stretching angle is point cantact in drawing process and between the tablet of gearshift axle sleeve, easily by tablet plucking, hardly enter in stretchable holes, easily result in material thickness when just starting and stretching quickly thinning, size bad control in drawing process of gearshift axle sleeve each several part, size is unstable, and finished product is easy to cracking phenomena occur after placing a period of time, have a strong impact on shifting shaft set security performance in use.

Summary of the invention

Goal of the invention:For problems of the prior art, the present invention provides a kind of and stretches die and the method for stretching gearshift axle sleeve thereof, and the gearshift axle sleeve dimensionally stable using this stretching die drawing and forming is easy to control, and without cracking phenomena occurs after long-term placement.

Technical scheme:The invention provides a kind of stretching die, the junction, upper surface including die main body and stretchable holes, the top, medial wall of described stretchable holes and described die main body has stretching oblique angle.

Further, described stretching oblique angle has middle bevels, nose-circle arc angle and bottom arc chord angle.

Preferably, described middle bevels is 30 �� ~ 45 �� angles with the axis of described stretchable holes.

Preferably, described middle bevels is 35 �� of angles with the axis of described stretchable holes.

Preferably, 0.5 ~ 5 times that is sized to material thickness of described nose-circle arc angle.

Preferably, 0.5 ~ 5 times that is sized to material thickness of described bottom arc chord angle.

Preferably, described die main body is made up of Hardmetal materials.

Present invention also offers a kind of above-mentioned stretching die for the method stretching gearshift axle sleeve, comprise the steps of S1: be positioned on the upper surface of described stretching die by the tablet of described gearshift axle sleeve; S2: described tablet is punctured formation bullport; S3: by the guiding of described bullport, carries out multi-drawing to described tablet until reaching preset thickness along described stretching oblique angle and described stretchable holes; S4: carry out the tablet of described preset thickness finally stretching and shaping forms described gearshift axle sleeve.

Beneficial effect:Owing to the stretching die in the present invention has stretching oblique angle, the existence at this stretching oblique angle makes to carry out in drawing process at the tablet that shifting shaft is overlapped, tablet contacts with stretching formation face between oblique angle, with tablet in prior art compared with the point cantact stretched between angle, the mode of employing face contact can make the entrance stretchable holes that tablet is stable, reduce plucking phenomenon and reduce cracking ratio, face contact is easily controlled the change of material thickness, tablet will not be made just quickly thinning at the stretching initial stage, after being drawn into gearshift axle sleeve finished product, long-time product surface of placing is without producing cracking phenomena, ensure that shifting shaft set security performance in use.

Accompanying drawing explanation.

Fig. 1 is the structural representation schematic diagram of drawing die in prior art;

Fig. 2 is the stretching cavity die structure schematic diagram in the present invention in embodiment 1;

Fig. 3 is the structure for amplifying schematic diagram in Fig. 2 in empty loop A;

Fig. 4 uses view when stretching die molding gearshift axle sleeve.

Detailed description of the invention

Below in conjunction with accompanying drawing, the present invention is described in detail.

Embodiment 1:

Present embodiments provide for a kind of stretching die, as shown in Figure 2, this stretching die is mainly made up of die main body 1 and stretchable holes 2, stretchable holes 2 is the endoporus of die main body 1, die main body 1 is preferably used Hardmetal materials and makes, such as RD30 steel alloy, its surface can adopt nano combined physical vapour deposition (PVD) PVD coating, the top, medial wall of stretchable holes 2 and the upper surface of die main body 1 are provided with stretching oblique angle 3, such as Fig. 3, being made up of three parts of this stretching oblique angle 3, respectively nose-circle arc angle 32, middle bevels 31 and bottom arc chord angle 33, wherein, nose-circle arc angle 32 is the R angle between the upper surface of die main body 1 and middle bevels 31, bottom arc chord angle 33 is the R angle between stretchable holes 2 medial wall and middle bevels 31, the size of the two is both preferably between 0.5 ~ 5 times of material thickness, in 30 �� ~ 45 �� angle theta between the axis of middle bevels 31 and stretchable holes 2, preferred �� is 35 ��, preferred angle can as required molding gearshift axle sleeve specification to this debugging after set, 35 �� herein are the optimum that the applicant obtains after repeatedly debugging.

Embodiment 2:

Present embodiments provide for a kind of method stretching die stretching gearshift axle sleeve used in embodiment mode 1, mainly comprise the steps that

First the tablet 4 of gearshift axle sleeve is navigated on the upper surface stretching die;

Then this tablet 4 is punctured formation bullport;

Tablet 4 is stretched by the guiding then passing through this bullport, in drawing process, form face between tablet 4 with the middle bevels 31 stretching oblique angle 3 to contact, S point position in Fig. 4, and there is between middle bevels 31 and stretchable holes 2 medial wall bottom arc chord angle 33, so in whole drawing process, tablet 4 can enter in stretchable holes 2 along stretching oblique angle 3 more stablely; After completing one-off drawing, the size to the circular arc chamfering 41 formed on tablet 4 and thickness is needed to be estimated, if having been able to reach the preset standard size needed for gearshift axle sleeve and thickness, then it is made directly follow-up final drawing and forming product, if preset standard size and thickness can not be reached after one-off drawing, then need again to carry out above-mentioned stretching, until the circular arc chamfering 41 of tablet 4 reaches preset standard size and thickness;

Finally the above-mentioned tablet 4 with preset standard size and thickness is carried out final drawing and forming shaping again, forms gearshift axle sleeve finished product.

Above-mentioned embodiment only for technology design and the feature of the present invention are described, its object is to allow person skilled in the art will appreciate that present disclosure and to implement according to this, can not limit the scope of the invention with this. All equivalent transformations done according to spirit of the invention or modification, all should be encompassed within protection scope of the present invention.

Claims

1. one kind stretches die, it is characterised in that the junction, upper surface including die main body (1) and stretchable holes (2), the top, medial wall of described stretchable holes (2) and described die main body (1) has stretching oblique angle (3).

2. stretching die according to claim 1, it is characterised in that described stretching oblique angle (3) has middle bevels (31), nose-circle arc angle (32) and bottom arc chord angle (33).

3. stretching die according to claim 2, it is characterised in that the axis of described middle bevels (31) and described stretchable holes (2) is 30 �� ~ 45 �� angles.

4. stretching die according to claim 3, it is characterised in that the axis of described middle bevels (31) and described stretchable holes (2) is 35 �� of angles.

5. stretching die according to claim 2, it is characterised in that 0.5 ~ 5 times that is sized to material thickness of described nose-circle arc angle (32).

6. stretching die according to claim 2, it is characterised in that 0.5 ~ 5 times that is sized to material thickness of described bottom arc chord angle (33).

7. stretching die according to any one of claim 1 to 6, it is characterised in that described die main body (1) is made up of Hardmetal materials.

8. the method that the stretching die as according to any one of claim 1 to 6 is used for stretching gearshift axle sleeve, it is characterised in that comprise the steps of

S1: the tablet of described gearshift axle sleeve is positioned on the upper surface of described stretching die;

S2: described tablet is punctured formation bullport;

S3: by the guiding of described bullport, carries out multi-drawing to described tablet until reaching preset thickness along described stretching oblique angle (3) and described stretchable holes (2);

S4: carry out the tablet of described preset thickness finally stretching and shaping forms described gearshift axle sleeve.