CN106427400A - Axle housing of driven axle, as well as shaping mold and shaping technology of axle housing - Google Patents

Abstract

The invention provides a driven axle housing, which includes a seamless tube body and two seamless tube ends, the seamless tube ends are seamlessly connected to both ends of the seamless tube body, the A through hole with a constant inner diameter is provided between the two ends of the seamless pipe body, and a perforation is provided at the end of the seamless pipe, and the inner diameter of the perforation is not larger than the inner diameter of the through hole. The inner diameter at the connection position of the seamless pipe body is the same as the inner diameter of the through hole. The invention also provides a molding die, which is used to manufacture the driven axle housing. The invention also provides a molding process for manufacturing the driven axle housing by using the mold. The driven axle housing structure and its molding die and molding process provided by the invention enable the driven axle housing to have high precision, high strength, beautiful appearance, high material utilization rate, simpler processing industry and lower processing cost.

Description

A driven axle housing and its molding die and molding process

technical field

The invention relates to the technical field of structural design of auto parts, in particular to a driven axle housing and a molding die thereof, and also to a molding process.

Background technique

At present, the driven axle housing of automobiles is mainly manufactured by the stamping half-shell process. Specifically, the steel plate is cut and blanked into two blanks, and the two blanks are stamped and formed separately, and the welding seam is cut and processed, and then assembled. Welded into the axle housing body. The axle housing body produced by this process is prone to quality problems if it is not properly controlled at the butt weld of two steel plates. In addition, the two steel plates need to be cut separately, so there are still problems such as low material utilization rate, complex production process, long process, high production cost, and unattractive appearance.

Contents of the invention

The main purpose of the present invention is to overcome the defects existing in the driven axle housing of existing automobiles, and propose a new type of driven axle housing and its molding die. The technical problem to be solved is to make the driven axle housing High precision, high strength, beautiful appearance, high material utilization rate, and the processing industry is simpler and the processing cost is lower.

The purpose of the present invention and the solution to its technical problems are achieved by adopting the following technical solutions. A driven axle housing according to the present invention comprises: a seamless tube body and seamless tube ends connected to both ends of the seamless tube body, the seamless tube ends are seamlessly connected to the seamless tube At both ends of the pipe body, a through hole with a constant inner diameter is provided between the two ends of the seamless pipe body, and a perforation is provided at the end of the seamless pipe, and the inner diameter of the perforation is not larger than the inner diameter of the copper buckle. The inner diameter of the perforation at the connection position between the end of the seamless pipe and the seamless pipe body is the same as the inner diameter of the through hole.

Further, the wall thickness of the end of the seamless pipe body is 18%-20% thicker than the wall thickness of the seamless pipe body.

Further, the two ends of the seamless pipe body further include a transition portion and a flange portion, one end of the transition portion is connected to the seamless pipe body, and the other end is connected to the flange portion.

Further, the inner diameter of the flange part is uniform, the inner diameter of the transition part is the same as the inner diameter of the seamless pipe body at the joint between the transition part and the seamless pipe body, and the inner diameter of the transition part is along the The direction from the butt joint of the seamless pipe body to the butt joint of the flange part gradually becomes smaller until the inner diameter of the flange part is the same.

Further, the cross section of the through hole of the seamless pipe is square, rectangular or circular, wherein the cross section of the through hole is perpendicular to the extending direction of the seamless pipe body.

Further, the cross-section of the perforation at the end of the seamless pipe is circular, square or rectangular.

Due to the deformation of the raw material during molding, the wall thickness at both ends of the seamless pipe body is increased by 18-20% compared with the wall thickness of the seamless pipe body. improve.

The present invention also provides a molding die for manufacturing any one of the above-mentioned driven axle housings, the molding die is provided with a cavity, and the cavity is used to accommodate the end of the seamless pipe, so The cavity includes a first cavity and a second cavity located at one end of the first cavity, the first cavity is used for accommodating the transition part, and the second cavity is used for accommodating the For the flange part, the size of the first cavity is the same as that of the transition part, and the size of the second cavity is not the same as that of the flange.

Further, the cross-section of the first cavity is trapezoidal with an opening outward, and the cross-section of the second cavity is rectangular, wherein the cross-sections of the first cavity and the second cavity are extending along the end of the seamless pipe. direction parallel.

The present invention also provides a molding process of the driven axle housing manufactured by any one of the above-mentioned molding dies, the two ends of the seamless pipe body are processed through the molding die; The end portion of the seamless pipe is formed by sequentially reducing the inner diameter of the first cavity and the second cavity of the molding die.

Further, the step-by-step diameter reduction process refers to performing step-by-step reduction in diameter on both ends of the seamless pipe end part, and forming according to the shapes of the first cavity and the second cavity of the molding die Processing, that is, the inner diameter of the first cavity is larger than the inner diameter of the second cavity, so that the inner diameter of the transition part is larger than the inner diameter of the flange part, thereby forming the transition part and the flange part respectively.

The present invention uses a seamless tube to make the driven axle housing, which is integrally formed, avoiding the quality of the welding seam in the driven axle housing welded by two steel plates in the prior art The problem is that the utilization rate of materials is improved, and the appearance of the one-piece driven axle housing is better, and the wall thickness of the two ends of the seamless tube formed by pressing is increased, which improves the service life and load capacity of the driven axle housing force. Simultaneously, the molding die provided by the invention has a simple structure and low cost of remodeling. In addition, the forming process provided by the present invention can make the two ends of the seamless pipe undergo one-time integral forming treatment, the production process is simpler, and cracks or other quality problems are not easy to occur.

Description of drawings

Fig. 1 shows a schematic structural diagram of a square seamless pipe body provided by an embodiment of the present invention.

Fig. 2 shows a cross-sectional view of a molding die provided by an embodiment of the present invention.

Fig. 3 shows a schematic structural diagram of a driven axle housing provided by an embodiment of the present invention.

The main components are as follows:

The seamless pipe body 1; the through hole 10 of the seamless pipe; the inner diameter d1 of the seamless pipe body: the molding die 2; the cavity 20; the first cavity 201; the second cavity 202; ; Transition 301; Flange 302; End inner diameter of seamless pipe d2.

detailed description

The invention provides a driven axle housing and its molding die. The driven axle housing is processed from a seamless pipe, including a seamless pipe body 1 and a seamless pipe end connected to the end of the seamless pipe body 1. part 3, a through hole 10 with a constant inner diameter is provided between the two ends of the seamless pipe body 1, and a perforation 30 is provided in the end part 3 of the seamless pipe, and the inner diameter of the perforation is not larger than the inner diameter of the through hole, The seamless pipe body 1 is integrally formed with two ends 3 of the seamless pipe body. The forming mold is used for forming the driven axle housing. A cavity 20 is arranged in the forming mold 2, and the cavity 20 includes a first cavity 201 and a second cavity 202. The first cavity is used for accommodating For the above-mentioned transition part, the second cavity is used for accommodating the above-mentioned flange part.

In addition, the present invention also provides a molding process for the above-mentioned driven axle housing manufactured by the above-mentioned molding die. The end of the seamless pipe is formed by sequentially reducing the inner diameters of the first cavity 201 and the second cavity 202 of the molding die.

Fig. 1 shows a schematic structural view of a square seamless pipe body 1 provided by an embodiment of the present invention, the square seamless pipe body 1 is a steel pipe with a through hole 10 inside, the cross section of the through hole 10 is square, wherein the through hole The cross section of 10 is perpendicular to the stretching direction of the seamless pipe body 1, the inner diameter d1 of the seamless pipe body 1 represents the side length of the square; the end 3 of the square seamless pipe body 1 is provided with a perforation 30, the perforated The cross section is circular, and the inner diameter d2 at the end of the seamless pipe represents the diameter of the circle. Fig. 2 has shown the forming mold 2 of the embodiment of the present invention, and this forming mold 2 is provided with a cavity 20, is used for accommodating the above-mentioned end portion 3, and wherein cavity 20 comprises a first cavity 201 and is positioned at this first cavity again. The second cavity 202 at one end of the cavity, the 202 of the first cavity 201 is a trapezoidal horizontal cross-section along the stretching direction of the end of the seamless pipe, the trapezoidal opening is outward, and the second cavity 202 is along the direction of the seamless pipe. The horizontal cross-section of the end along the extension direction is rectangular, and the length of the long side of the rectangle is the same as the length of the short side of the trapezoid, that is, the trapezoid and the rectangle form a continuous plane. Please refer to Fig. 3, the two ends of the square seamless pipe shown in Fig. 1 are deformed under the technology of pressing and forming, and finally bonded to the inner wall of the cavity of the forming mold 2, as shown in Fig. 3 The driven axle housing structure of the present embodiment. As a preference, in this embodiment, the square seamless pipe is processed by hydraulic forming. The driven axle housing is composed of a square seamless tube body 1 and two ends 3 of the square seamless tube, the inner diameter d2 of the two ends 3 of the square seamless tube is not greater than the inner diameter d1 of the square seamless tube body 1, Moreover, the square seamless pipe body and the two ends of the square seamless pipe body are integrally formed, which reduces quality problems due to welding seams, saves materials, and has a more beautiful appearance.

Please continue to refer to Fig. 1, Fig. 2 and Fig. 3, the end of the square seamless pipe body 1 further includes a transition portion 301 and a flange portion 302, one end of the transition portion 301 is connected with the square seamless pipe body 1, and the other One end is connected to the flange portion 1 , and the flange portion 302 has a uniform inner diameter and can be seamlessly accommodated in the second cavity 202 of the forming mold 2 . The inner diameter of the transition gradually becomes smaller along the butt joint of the square seamless pipe body 1 to the butt joint of the flange part, and finally is the same as the inner diameter of the flange part. Therefore, the inner diameter d2 of the end of the square seamless pipe is a variable value, and the value of d2 is constant at the flange part. At the transition part, the value of d2 will gradually increase to the same value as The inner diameter d1 of the square seamless pipe body is the same, and can be accommodated seamlessly in the first cavity 201 of the forming mold 2 . Similarly, due to the deformation of the raw material during molding, the wall thickness of the end portion 3 of the square seamless pipe body 1 increases by 18-20% compared with the wall thickness of the square seamless pipe body 1, thereby improving the service life of the driven axle housing and carrying capacity. In other embodiments of the present invention, the through hole 30 of the seamless pipe body is rectangular or circular. In this embodiment, the perforation at the end of the seamless pipe is circular, and in other embodiments the perforation at the end of the seamless pipe is square, rectangular or other shapes.

Please continue to refer to FIG. 2, the cavity 20 is used to accommodate the end portion 3 of the seamless pipe, the first cavity 201 and the second cavity 202 are respectively used to accommodate the transition portion 301 and the flange portion 302, to cast The present invention proposes the end of the seamless tube of the driven axle housing. In this embodiment, the cross-sections of the first cavity 201 and the second cavity 202 of the forming mold along the horizontal direction of the end of the seamless tube are trapezoidal and rectangular respectively. , in other embodiments, the cross-sections of the first cavity and the second cavity along the horizontal direction of the end of the seamless pipe are two trapezoidal, conical or a combination of other reasonable shapes. Because the first cavity and the second cavity are set according to the manufacturing requirements of the driven axle housing. The mold has a simple structure and low cost of remodeling, and the forming process of using the forming mold to manufacture the driven axle housing of the present invention is simple and low in cost.

In other embodiments, the forming process of the driven axle housing of the present invention may also be air pressure forming, hot pressing forming or other forming processes.

Continuing to refer to Fig. 1, Fig. 2 and Fig. 3, the specific forming process steps are as follows: the two ends 10 of the seamless pipe body 1 are subjected to diameter reduction processing through the forming die 2; The shapes of the first cavity 201 and the second cavity 202 of the mold 2 are subjected to sequential diameter reduction processing. For example, the inner diameter of the seamless pipe body is 100° long, and the two ends are processed sequentially. 80. Prevent cracks or other quality defects during processing caused by material stress deformation, and finally process the end 3 of the seamless pipe.

In summary, although preferred embodiments of the present invention have been disclosed for illustrative purposes, the present invention is not limited to the above-mentioned embodiments, and within the scope of the basic technical ideas of the present invention, those skilled in the art It can be modified and applied in various ways.

Claims (10)

1. A driven axle housing, characterized in that it comprises: a seamless tube body and seamless tube ends connected to the two ends of the seamless tube body, the seamless tube ends are seamlessly connected to the The two ends of the seamless pipe body, a through hole with a constant inner diameter is provided between the two ends of the seamless pipe body, and a perforation is provided at the end of the seamless pipe, and the inner diameter of the perforation is not larger than that of the through hole. Inner diameter, the inner diameter of the perforation at the connection position between the end of the seamless pipe and the seamless pipe body is the same as the inner diameter of the through hole. 2. The driven axle housing according to claim 1, wherein the wall thickness of the end of the seamless pipe body is 18%-20% thicker than that of the seamless pipe body. 3. A driven axle housing according to claim 1, wherein the end of the seamless tube comprises: a transition part and a flange part, and one end of the transition part is connected to the seamless tube The pipe body is connected, and the other end of the transition part is connected with the flange part. 4. A driven axle housing according to claim 3, characterized in that, the inner diameter of the flange part is uniform, and the inner diameter of the transition part is at the joint between the transition part and the seamless pipe body The same as the inner diameter of the seamless pipe body, the inner diameter of the transition portion gradually decreases along the direction from the butt joint of the seamless pipe body to the butt joint of the flange part until it is equal to the inner diameter of the flange part same. 5. A driven axle housing according to claim 1, characterized in that, the cross-section of the through hole is square, rectangular or circular, wherein the cross-section of the through hole is along with the seamless pipe body The extension direction is vertical. 6. A driven axle housing according to claim 1, wherein the section of the perforation at the end of the seamless tube is circular, square or rectangular, wherein the section of the perforation is the same as that of the seamless tube The broken part of the seam tube is vertical along the stretching direction. 7. A molding die for manufacturing a driven axle housing according to any one of claims 1 to 6, characterized in that: a cavity is provided in the molding die, and the cavity is used to accommodate the The end of the slit tube, the cavity includes a first cavity and a second cavity located at one end of the first cavity, the first cavity is used to accommodate the transition part, and the second cavity For accommodating the flange portion, the size of the first cavity is the same as that of the transition portion, and the size of the second cavity is the same as that of the flange portion. 8. The molding die according to claim 7, wherein the section of the first cavity is trapezoidal with an opening outward, and the section of the second cavity is rectangular, wherein the first cavity and the second cavity The cross-section is parallel to the stretching direction of the end of the seamless pipe. 9. A molding process utilizing the mold of claim 7 or 8 to manufacture the driven axle housing, characterized in that, the two ends of the seamless pipe body are subjected to diameter reduction processing by the molding mould; The end of the seamless pipe is processed sequentially according to the shapes of the first cavity and the second cavity of the forming mold, so as to form a transition portion and a flange portion of the end of the seamless pipe. 10. The molding process of the driven axle housing according to claim 9, characterized in that, the sequential diameter reduction processing means that the first cavity and the second cavity of the molding die will be The inner diameter becomes smaller sequentially, and the end of the seamless pipe is sequentially formed, so as to form the transition part and the flange part.