Cold bending die for hollow stabilizer bar

Abstract

The utility model relates to a hollow stabilizer bar cold bending die which comprises a clamping die, an explorator and a round die, the explorator is located on the right side of the clamping die, and the round die is located in front of the clamping die. A first strip-shaped groove is formed in the front end of the clamping die, and the depth of the first strip-shaped groove is equal to (1-N) * the diameter of the hollow stabilizer bar to be cold-bent; a second strip-shaped groove is formed in the front end of the explorator, and the depth of the second strip-shaped groove is equal to (1-N) * the diameter of the hollow stabilizer bar to be cold-bent; an arc-shaped groove is formed in the outer side of the round die, the depth of the arc-shaped groove is equal to (1 + N) * the diameter of the hollow stabilizer bar to be cold-bent, and N is larger than 0. The hollow stabilizer bar has the beneficial effects that the arc degree of the bent part of the hollow stabilizer bar is restrained through the notch part of the arc-shaped groove, and the ellipticity of the bent part of the hollow stabilizer bar after cold bending is prevented from being too large.

Description

Technical Field

[0001] The utility model relates to the technical field of hollow stabilizer bar production, in particular to a hollow stabilizer bar cold bending die. Background Art

[0002] At present, due to the need for environmental protection and energy saving, lightweighting has become a trend in the development of automobiles around the world. Under the condition of the same stiffness, the hollow stabilizer bar is 60% lighter than the traditional solid stabilizer bar, so the hollow stabilizer bar is more in line with the requirements of automobile lightweighting and energy saving and emission reduction.

[0003] With the continuous development of automobile technology, high-stress thin-walled hollow stabilizer bars have become a development trend in the automobile industry. As the stress of the developed hollow stabilizer bars increases, the wall thickness reduction rate increases. Based on the special requirements of the stabilizer bar drawings, after using the traditional hollow stabilizer bar cold bending mold to bend the tube, the ellipticity of the measured angle of the bend does not meet the customer's standard requirements, so it is urgent to transform the cold bending mold structure.

[0004] The hollow stabilizer bar cannot be bent by overall heating, but can only be bent by cold bending. Due to the high requirements of customers on the bending position, the material of the high-stress hollow stabilizer bar is thin-walled, and the cold bending needs to consider the ovality of the bending part. Excessive ovality will lead to uneven stress distribution in the bending part, which is prone to product failure.

[0005] The cross-sections of the grooves on the round die, clamp die, and backing die of the traditional cold bending die of the hollow stabilizer bar are all semicircular. During cold bending, the round die, clamp die, and backing die cannot completely constrain the arc of the bending part of the hollow stabilizer bar, resulting in excessive ellipticity of the bending part of the hollow stabilizer bar after cold bending. Therefore, it is necessary to add anti-deformation design to control the upper and lower ends during the bending process to prevent ellipse and optimize the ellipticity. Utility Model Content

[0006] The utility model aims to overcome the above problems existing in the prior art and provide a hollow stabilizer bar cold bending die.

[0007] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0008] A cold-bending die for a hollow stabilizer rod comprises a clamping die, a backing die and a round die, wherein the backing die is located on the right side of the clamping die and the round die is located in front of the clamping die;

[0009] The front end of the clamping die is provided with a first strip groove with a minor arc cross section for matching with the outer wall of the hollow stabilizing rod to be cold-bent, and the depth of the first strip groove = (1-N) * the diameter of the hollow stabilizing rod to be cold-bent;

[0010] The front end of the mold is provided with a second strip groove with a minor arc cross section for matching with the outer wall of the hollow stabilizer rod to be cold-bent, and the depth of the second strip groove = (1-N) * the diameter of the hollow stabilizer rod to be cold-bent;

[0011] The outer side of the circular mold is provided with an arc groove with a U-shaped cross section for cooperating with the outer wall of the hollow stabilizer rod to be cold-bent, and the depth of the arc groove = (1+N)*the diameter of the hollow stabilizer rod to be cold-bent, and N is greater than 0.

[0012] Preferably, N is 0.1034.

[0013] Among them, the diameter of the circle corresponding to the cross-section of the first strip groove is equal to the diameter of the hollow stabilizing rod to be cold-bent, the diameter of the circle corresponding to the cross-section of the second strip groove is equal to the diameter of the hollow stabilizing rod to be cold-bent, the cross-section at the bottom of the arc groove is semicircular, and the diameter of the circle corresponding to the cross-section at the bottom of the arc groove is equal to the diameter of the hollow stabilizing rod to be cold-bent.

[0014] Wherein, the rear end of the circular mold is provided with a contact plane which cooperates with the front end of the clamping mold.

[0015] The beneficial effects of the utility model are as follows: a first strip groove with a minor arc-shaped cross section is arranged on the clamping die, a second strip groove with a minor arc-shaped cross section is arranged on the supporting die, an arc groove with a U-shaped cross section is arranged on the circular die, and the cross section at the bottom of the arc groove is made semicircular, and the notch portion of the arc groove is utilized to constrain the arc degree of the bending portion of the hollow stabilizer rod, so as to prevent the ellipticity of the bending portion of the hollow stabilizer rod from being too large after cold bending. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1 It is a schematic diagram of the structure of the clamping mold, the supporting mold and the circular mold in the utility model when viewed from above in the mold closing state;

[0018] Figure 2 It is a schematic structural diagram of the side view of the clamping die in the utility model;

[0019] Figure 3 It is a schematic structural diagram of the side view of the model in the utility model;

[0020] Figure 4 It is a schematic structural diagram of a side view of a circular mold in the utility model;

[0021] Figure 5 It is a schematic diagram of the structure of the hollow stabilizing rod of the utility model being clamped between the clamping die and the round die;

[0022] Figure 6 It is a schematic diagram of the structure of the hollow stabilizing rod of the utility model being clamped between the supporting mold and the circular mold;

[0023] Explanation of the reference numerals in the figure: clamping die 1, first strip groove 11, supporting die 2, second strip groove 21, circular die 3, arc groove 31, contact plane 32, hollow stabilizing rod 100. DETAILED DESCRIPTION

[0024] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0025] like Figures 1 to 6 As shown, a hollow stabilizer rod cold bending mold includes a clamping mold 1, a backing mold 2 and a round mold 3, wherein the backing mold 2 is located on the right side of the clamping mold 1, and the round mold 3 is located in front of the clamping mold 1.

[0026] The front end of the clamp 1 is provided with a first strip groove 11 with a minor arc cross-section for cooperating with the outer wall of the hollow stabilizing rod 100 to be cold-bent. The depth of the first strip groove 11 = (1-0.1034)*the diameter of the hollow stabilizing rod 100 to be cold-bent, and the diameter of the circle corresponding to the cross-section of the first strip groove 11 is equal to the diameter of the hollow stabilizing rod 100 to be cold-bent.

[0027] The front end of the backing mold 2 is provided with a second strip groove 21 with a minor arc cross-section for cooperating with the outer wall of the hollow stabilizing rod 100 to be cold-bent. The depth of the second strip groove 21 = (1-0.1034)*the diameter of the hollow stabilizing rod 100 to be cold-bent, and the diameter of the circle corresponding to the cross-section of the second strip groove 21 is equal to the diameter of the hollow stabilizing rod 100 to be cold-bent.

[0028] The outer side of the circular mold 3 is provided with an arc groove 31 with a U-shaped cross section for cooperating with the outer wall of the hollow stabilizing rod 100 to be cold-bent. The depth of the arc groove 31 = (1+0.1034)*the diameter of the hollow stabilizing rod 100 to be cold-bent. The cross section at the bottom of the arc groove 31 is semicircular, and the diameter of the circle corresponding to the cross section at the bottom of the arc groove is equal to the diameter of the hollow stabilizing rod 100 to be cold-bent; the rear end of the circular mold 3 is provided with a contact plane 32 that cooperates with the front end of the clamping mold.

[0029] A first strip groove with a minor arc-shaped cross section is provided on the clamping die, a second strip groove with a minor arc-shaped cross section is provided on the supporting die, an arc groove with a U-shaped cross section is provided on the circular die, and the cross section at the bottom of the arc groove is made semicircular, and the notch of the arc groove is utilized to constrain the arc degree of the bending part of the hollow stabilizer rod to prevent the ellipticity of the bending part of the hollow stabilizer rod from being too large after cold bending.

[0030] The same type of hollow stabilizer bar was cold-bent using the conventional hollow stabilizer bar cold-bending mold and the hollow stabilizer bar cold-bending mold in this embodiment, and then the ovality of the bending part of the hollow stabilizer bar was measured. The measurement results are shown in Table 1 below:

[0031] Table 1. Measurement results of ovality of the curved part of the hollow stabilizer bar

[0032]

[0033] It can be seen from Table 1 that the ovality of the bending part of the hollow stabilizer bar formed by the cold bending mold of the hollow stabilizer bar in this embodiment not only meets the standard, but is also much lower than the ovality of the bending part of the hollow stabilizer bar formed by the traditional cold bending mold of the hollow stabilizer bar.

[0034] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A hollow stabilizer bar cold bending die, characterized in that: It includes a clamping die, a backing die and a round die, wherein the backing die is located on the right side of the clamping die and the round die is located in front of the clamping die; The front end of the clamping die is provided with a first strip groove with a minor arc cross section for matching with the outer wall of the hollow stabilizing rod to be cold-bent, and the depth of the first strip groove = (1-N) * the diameter of the hollow stabilizing rod to be cold-bent; The front end of the mold is provided with a second strip groove with a minor arc cross section for matching with the outer wall of the hollow stabilizer rod to be cold-bent, and the depth of the second strip groove = (1-N) * the diameter of the hollow stabilizer rod to be cold-bent; The outer side of the circular mold is provided with an arc groove with a U-shaped cross section for cooperating with the outer wall of the hollow stabilizer rod to be cold-bent, and the depth of the arc groove = (1+N)*the diameter of the hollow stabilizer rod to be cold-bent, and N is greater than 0.

2. The mold according to claim 1, characterized in that: The N is 0.1034.

3. The mold according to claim 1, characterized in that: The diameter of the circle corresponding to the cross-section of the first strip groove is equal to the diameter of the hollow stabilizing rod to be cold-bent, the diameter of the circle corresponding to the cross-section of the second strip groove is equal to the diameter of the hollow stabilizing rod to be cold-bent, the cross-section at the bottom of the arc-shaped groove is semicircular, and the diameter of the circle corresponding to the cross-section at the bottom of the arc-shaped groove is equal to the diameter of the hollow stabilizing rod to be cold-bent.

4. The mold according to claim 1, characterized in that: The rear end of the circular die is provided with a contact plane matched with the front end of the clamping die.

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