CN116689695A - Method for bending and forming arm part of knuckle with arm and knuckle blank - Google Patents

Abstract

The invention relates to the technical field of steering knuckle forging, in particular to a method for bending and forming the arm of a steering knuckle with an arm and a blank of the steering knuckle, which fixes the rod and disk of the steering knuckle through the cavity of the mold, suspends the lower part of the arm, and then The bending upper mold moves down to bend the arm until the bending upper mold and the bending lower mold are molded together, wherein the bending upper mold is provided with a pressing block and a roller that sequentially squeeze the arm, and the pressing block is arranged at the bottom of the bending upper mold , the corner of the lower end of the bending upper die is provided with a roller hole, the roller is rollingly connected with the roller hole, the diameter of the roller is 80-110 mm, a section of the circumferential side of the roller is exposed outside the bending upper die, and is connected with the bending The profile of the side of the upper die is tangent, the pressing block is supported on the lower part of the roller and the end of the pressing block is tangent to the circumferential surface of the roller. This application optimizes the force and deformation of the arm during the bending process by pressing first and then rolling , improve the quality of forgings and prolong the service life of dies.

Description

Method for Bending Forming Arm of Steering Knuckle with Arm and Steering Knuckle Blank

technical field

The invention relates to the technical field of steering knuckle forging, in particular to a method for bending an arm part of a steering knuckle with an arm and a steering knuckle blank.

Background technique

Steering knuckle is one of the main parts of the car. It effectively connects the braking system, steering system and suspension system through multiple parts, and plays the dual task of steering and carrying. It is an important safety part of the car chassis. The steering knuckle is generally fork-shaped, including a rod part, an ear part, and a disc part. The ear part includes a long ear and a short ear, and the long ear and the short ear have kingpin holes for installing the kingpin. In invention patents ZL2017108855834 and ZL2017108855815, the applicant provides an automobile steering knuckle integrally formed with a steering arm, as well as a processing technology and a bending mold for the steering knuckle.

For this bending die, in actual use, it is found that the arm of the steering knuckle blank has a large bending angle, basically 90°. During the bending process, the bending die slides relatively far from the surface of the arm, resulting in a part of the arm being pressed. The side surface is prone to defects such as scratches, strains, and dimensional instability. The surface quality is not good, and subsequent processing is required, and the mold is also prone to wear.

Contents of the invention

The object of the present invention is to address the deficiencies of the prior art, and provide a method for bending and forming the arm of a steering knuckle with an arm and a blank of the steering knuckle, which optimizes the force and force of the arm during the bending process by pressing first and then rolling. Deformation improves the quality of forgings and prolongs the service life of dies.

The technical solution adopted by the present invention to solve the technical problem is: a method for bending and forming the arm part of the steering knuckle with an arm, which fixes the rod part and the disc part of the steering knuckle through the cavity of the mold, suspends the lower part of the arm part, and then bends the upper part of the steering knuckle The mold moves downward to bend the arm until the upper bending die and the lower bending die are closed. The upper bending die is provided with a pressing block and a roller that sequentially squeeze the arm. The pressing block is arranged at the bottom of the upper bending die. A roller hole is provided at the corner of the lower end of the bending upper die, and the roller is rollingly connected with the roller hole. The diameter of the roller is 80-110mm. The profile of the side is tangent, the pressing block is supported on the lower part of the roller and the end of the pressing block is tangent to the circumferential surface of the roller.

Wherein, when the bending angle of the arm is less than 45°, the pressing block squeezes the arm; when the bending angle of the arm is greater than 45°, the roller rolls and squeezes the arm from the side.

Preferably, several roller needles are arranged in the hole of the roller, and the roller is rotatably connected with the bending upper mold through the needle rollers.

Preferably, the needle roller is rotatably embedded in the circumferential surface of the roller hole.

Preferably, when the molds are closed, the two sides of the arm part closely fit the bending lower mold and the bending upper mold respectively.

Preferably, the axis of the roller is located in the horizontal direction, and the length of the roller is greater than the thickness of the arm.

Preferably, the thickness of the pressing block located below the roller is greater than 10mm.

Preferably, the central angle of the circumferential side of the roller exposed outside the curved upper mold is less than 90°.

Preferably, the speed when the bending upper mold goes down is 25-30mm/s.

To solve the technical problem, the present invention also provides a steering knuckle blank, which is obtained by the above method, and the side of the front end of the arm part away from the rod part is an inwardly concave arc surface.

The beneficial effects of the present invention are:

1. A method and mold for bending and forming the arm of the steering knuckle with an arm are provided. According to the characteristics that the bending angle is large when the arm is formed, and it is mainly bent at the root of the arm, the bending lower mold is used to perform the bending at the root. For support, first use the pressing block to bend the arm downward. When bending, the force point of the arm is mainly in the middle of the arm, and at the same time use the pressing block to correct the front end of the arm; then use the roller to roll and bend the arm. When rolling, it is rolled from the side close to the root to the end side, so that the arm bends and the side close to the lower bending die is sequentially attached to the lower bending die from the root to the end. The forming effect is good and the springback is small. And because the arm is squeezed by the roller, the surface of the arm is smooth, free from scratches and strains, and the quality of the forging is improved;

2. The service life of the formwork is improved, and the installation position of the roller is safe and reliable, and it is not easy to fall off;

3. Change the fist at the front end of the steering knuckle with the arm to an inner arc surface sunken inwards to facilitate forging and bending.

Description of drawings

Fig. 1 is a structural schematic diagram of a mold used in the bending forming method of the present invention.

Fig. 2-Fig. 9 are schematic diagrams of the position of the bending upper mold and the arm during the bending process of the present invention.

Fig. 10 is a schematic diagram of the contact part between the arm and the roller when the present invention is bent.

Fig. 11 is a schematic diagram of installation of the roller of the present invention.

Fig. 12 is a schematic structural view of the arm part of the steering knuckle blank processed by the present invention.

Explanation of reference signs:

1——rod 2——plate

3——Arm 4——Bending Upper Die

41——Block 42——Roller

43——needle roller 5——bending die

A——The starting point of the contact between the arm and the roller B——The end point of the contact between the arm and the roller

C——The arc surface of the arm.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, and the implementation scope of the present invention is not limited thereto.

The steering knuckle structure processed by the method of bending and forming the arm part of a steering knuckle with arm in this embodiment is roughly as shown in the invention patent ZL2017108855834, which includes a rod part 1, a disc part 2, an ear part and a steering arm (that is, the arm of the present application Part 3) may or may not include a drawbar arm. The procedure before bending is the same as that of this patent, which is to form a long straight arm through pre-forging and final forging, and then bend through the bending method of the present application.

As shown in Figures 1-9, when the present application is bent, the stem part 1, disc part 2 and ear part of the steering knuckle are fixed through the cavity of the mold, and this part is the same as that disclosed by the applicant in ZL2017108855815. The lower part of the arm 3 is suspended in the air, and the lower bending die 5 is supported from the root of the arm 3, and then the upper bending die 4 moves downward to bend the arm 3 until the upper bending die 4 and the lower bending die 5 are molded together, wherein the upper bending die 4 Die 4 is provided with briquetting block 41, roller 42 that squeezes arm portion 3 successively, and described briquetting block 41 is arranged on the bottom of bending upper die 4, and the corner of described bending upper die 4 lower ends is provided with roller hole, and described roller 42 is rollingly connected with the roller hole. The diameter of the roller 42 is 80-110mm. A section of the circumference side of the roller 42 is exposed outside the bending upper die 4 and is tangent to the contour of the side of the bending upper die 4. The pressing block 41 is supported on The lower part of the roller 42 and the end of the pressing block 41 are tangent to the peripheral surface of the roller 42 . The present application makes it possible to set a larger roller at the corner of the bending upper die 4 through this structure, so that the pressing block 41 is used to bend a certain angle first, and then the arm 3 is rolled by the roller. In Fig. 5, the roller 42 rolls the arm part 3 from A, until in Fig. 9, the roller 42 rolls to the B part of the arm part 3, as shown in Fig. 10, from point A to point B, its length is longer , roughly half the length of the arm portion 3, and it can be seen from Fig. 5-Fig. The distance is relatively large (compared with the pressing stroke of the pressing block 41), therefore, if the prior art is used, defects such as scratches and strains will be formed on the pressing surface of the arm. And through the above-mentioned scheme of the present application, the prior art is changed from pressing while friction sliding to the present application's first extrusion, then rolling, and then mold clamping correction, not only the surface quality of the forging billet after forming is good, but also the quality of the mold is improved. The service life, more importantly, in the process, the force point of extrusion is more reasonable, especially during the rolling process, the force point of extrusion moves from A to B, so that the arm is from the root to the end The arm part is supported by the lower bending die in turn, and under the support of the lower bending die, the side of the arm near the lower bending die has better molding quality and more stable dimensions.

Further, when the bending angle of the arm 3 is less than 45°, the pressing block 41 squeezes the arm 3, and when the bending angle of the arm 3 is greater than 45°, the roller 42 rolls and squeezes the arm 3 from the side.

Further, several roller needles 43 are arranged in the roller hole, and the roller 42 is rotatably connected with the bending upper mold 4 by being rotatably connected with the roller needles 43, or the roller needles 43 may not be used, but the roller 42 Rotate directly against the roller hole. After using the needle roller 43, the frictional resistance when the roller 42 rotates is reduced, and the service life is improved.

Further, as shown in FIG. 11 , the needle roller 43 is rotatably embedded in the circumferential surface of the roller hole.

Further, when the molds are closed, the two sides of the arm part 3 closely fit the bending lower mold 5 and the bending upper mold 4 respectively, so as to correct the blank.

Further, the axis of the roller 42 is located in the horizontal direction, and the length of the roller 42 is greater than the thickness of the arm portion 3 .

Further, the thickness of the pressure block 41 located below the roller 42 is greater than 10 mm, and this position supports the roller 42 from below.

Further, the central angle of the circumferential side of the roller 42 exposed outside the curved upper mold 4 is less than 90°.

Further, the bending upper mold 4 descends at a speed of 25-30mm/s, and a 6300KN press is used for bending and forming.

The arm portion of the steering knuckle blank obtained through this application, as shown in Figure 12, the side of the front end of the arm portion 3 away from the rod portion 1 is an inwardly concave arc surface, which corresponds to the roller 42, where The shape does not affect the strength of this position, which is conducive to bending and forming by the method of the present application.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting the protection scope of the present invention, although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand , the technical solution of the present invention may be modified or equivalently replaced without departing from the spirit and scope of the technical solution of the present invention.

Claims (9)

1. A method for bending and forming an arm part of a knuckle with an arm is characterized in that: the method comprises the steps that a rod part and a disc part of a steering knuckle are fixed through a cavity of a die, the lower part of an arm part is suspended, then a bending upper die descends to press and bend the arm part until the bending upper die and a bending lower die are clamped, wherein the bending upper die is provided with a pressing block and a roller which are sequentially extruded by the arm part, the pressing block is arranged at the bottom of the bending upper die, a roller hole is formed in the corner of the lower end of the bending upper die, the roller is in rolling connection with the roller hole, the diameter of the roller is 80-110 mm, one section of the circumferential side surface of the roller is exposed out of the bending upper die and is tangent with the contour of the side surface of the bending upper die, the pressing block is supported at the lower part of the roller, and the end part of the pressing block is tangent with the circumferential surface of the roller;

when the bending angle of the arm part is smaller than 45 degrees, the pressing block presses the arm part, and when the bending angle of the arm part is larger than 45 degrees, the roller rolls and presses the arm part from the side face.

2. The method of bending a knuckle arm with arm according to claim 1, wherein: the roller is rotatably connected with the bending upper die through the roller pin.

3. The method of bending a knuckle arm with arm according to claim 2, characterized in that: the roller pin is rotatably embedded on the circumferential surface of the roller hole.

4. The method of bending a knuckle arm with arm according to claim 1, wherein: when the mold is closed, the two sides of the arm part are closely attached to the bending lower mold and the bending upper mold respectively.

5. The method of bending a knuckle arm with arm according to claim 1, wherein: the axis of the roller is positioned in the horizontal direction, and the length of the roller is greater than the thickness of the arm part.

6. The method of bending a knuckle arm with arm according to claim 1, wherein: the thickness of the pressing block below the roller is greater than 10mm.

7. The method of bending a knuckle arm with arm according to claim 1, wherein: the central angle of the circumferential side surface of the roller exposed out of the bending upper die is smaller than 90 degrees.

8. The method of bending a knuckle arm with arm according to claim 1, wherein: the speed of the bending upper die in descending is 25-30mm/s.

9. A knuckle blank, characterized in that: the method according to any one of claims 1 to 8, wherein the side of the front end of the arm portion remote from the shaft portion is an inwardly concave arc surface.