Commercial vehicle hollow ball pin and preparation method thereof

Abstract

The invention belongs to the technical field of thrust rod ball pins, and particularly relates to a commercial vehicle hollow ball pin which comprises a ball part and connecting parts symmetrically connected to the two sides of the ball part, and the ball part and the connecting parts are of an integrally-formed structure. The ball part is of a cavity structure, and the thickness of the ball part is gradually increased from the middle to the two ends. The invention further provides a preparation method of the commercial vehicle hollow ball pin. According to the commercial vehicle hollow ball pin, the surface of the ball part is free of turning defects, and the notch effect is avoided; compared with the commercial hollow ball pin, the mass is reduced by 40%, and the light weight is improved; the integrally-formed structure greatly enhances the strength.

Description

Technical Field

[0001] The present application belongs to the technical field of thrust rod ball pins, and in particular, relates to a hollow ball pin for a commercial vehicle and a preparation method thereof. Background Art

[0002] The thrust rod ball pin is a part used in commercial vehicles and engineering vehicles. Its function is to constrain the extreme position of the axle, prevent the axle from shifting during driving and steering, and maintain the driving posture of the vehicle. Traditional ball pins are usually solid forgings. For example, in the patent with patent authorization announcement number CN211592145U and patent name "A thrust rod ball pin assembly", the ball pin skeleton is a solid structure. The manufacturing cost of the solid forged ball pin is relatively high and cannot meet the increasing demand for lightweight automobiles. Moreover, existing ball pins, even if they adopt a cavity structure, are mostly welded and have low strength. Summary of the invention

[0003] The present application provides a hollow ball pin for a commercial vehicle and a preparation method thereof, which solves the problems of heavy weight and low strength of the existing ball pins.

[0004] An embodiment of the present application provides a hollow ball pin for a commercial vehicle, comprising a ball portion and connecting portions symmetrically connected on both sides of the ball portion, wherein the ball portion and the connecting portions are an integrally formed structure; the ball portion is a cavity structure, and the thickness of the ball portion gradually increases from the middle to both ends.

[0005] Optionally, an annular groove is provided on the outer surface of the ball portion, and the annular groove is used to contain rubber.

[0006] Optionally, two annular grooves are provided, and there is a smooth transition between the two annular grooves.

[0007] The present application also provides a method for preparing a hollow ball pin for a commercial vehicle, comprising the following steps:

[0008] Step 1, heating and reducing the diameter of the hollow tube to obtain a reduced diameter tube;

[0009] Step 2, shearing the reduced diameter pipe to obtain a sheared pipe fitting with symmetry at both ends;

[0010] Step 3, heating and forging the two ends of the sheared pipe fitting to obtain a forged pipe fitting;

[0011] Step 4, performing quenching and tempering treatment on the forged pipe fittings;

[0012] Step 5, cutting and punching the quenched and tempered forged pipe fitting to obtain a hollow ball pin.

[0013] Optionally, in step 1, the heated hollow tube is placed in a rotary forging machine for forging and reducing the diameter, so that the hollow tube is formed into a tube with a hollow spherical portion in the middle and hollow reduced diameters at both ends, thereby obtaining a reduced diameter tube.

[0014] Optionally, in step 1, the selected hollow tube is induction heated to a temperature of 1100-1200°C.

[0015] Optionally, in step 3, both ends of the shear pipe are heated to a temperature of 950-1050°C.

[0016] Optionally, in step 3, the heated shearing tube is placed in a forging mold for forging, and both ends of the shearing tube are flattened at the same time until the upper and lower sides of the inner wall of the shearing tube are in contact with each other.

[0017] Optionally, the two ends of the shearing tube after forging are changed from circular to rectangular, and the two ends of the shearing tube are solid structures.

[0018] Optionally, in step 4, the surface hardness of the forged pipe fitting after quenching and tempering is HRC 30-35.

[0019] The hollow ball pin for commercial vehicles prepared in the present application has no turning defects on the ball surface, avoiding the notch effect; the commercial hollow ball pin has a 40% lower mass than the conventional one, thereby improving its lightweight; and the one-piece molding structure greatly enhances its strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 This is a schematic diagram of the structure of the hollow ball pin for a commercial vehicle in this application;

[0022] Figure 2 This is a cross-sectional view of a hollow ball pin for a commercial vehicle in this application;

[0023] Figure 3 It is a schematic diagram of the structure of the hollow tube in the unforged state;

[0024] Figure 4 It is a structural schematic diagram of the hollow tube during forging;

[0025] Figure 5 This is a schematic diagram of the structure of the hollow tube after forging;

[0026] Figure 6 This is a schematic diagram of the reduced diameter pipe obtained after forging;

[0027] Figure 7 It is a schematic diagram of shearing pipe fittings;

[0028] Figure 8 It is a schematic diagram of forged pipe fittings;

[0029] Fig. 9 This is a schematic diagram of the forged pipe fitting in the unpressed state;

[0030] Fig.10 It is a schematic diagram of the state of the forged pipe fitting after pressing;

[0031] Fig.11 It is a schematic diagram of the forging state of the hammer head in the rotary forging machine;

[0032] Fig.12 This is a schematic diagram of the rotary forging machine hammer head in the unforging state;

[0033] Fig.13 It is a three-dimensional diagram of a rotary forging machine;

[0034] Fig.14 It is a cross-sectional view of a rotary forging machine.

[0035] Explanation of symbols in the figure:

[0036] 1-ball part; 2-connecting part; 3-hollow pipe; 4-forging die; 5-reduced pipe; 6-shear pipe fitting; 7-forging pipe fitting; 11-annular groove; 21-connecting through hole; 31-roller; 32-hammer; 33-forging die; 34-spindle; 35-outer ring; 36-pad; 37-roller bracket. DETAILED DESCRIPTION

[0037] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0038] Example 1

[0039] See also Figure 1 The present application provides a hollow ball pin for a commercial vehicle, comprising a ball portion 1 and connecting portions 2 symmetrically connected to both sides of the ball portion, and each connecting portion 2 is provided with a connecting through hole 21.

[0040] The ball part 1 and the connecting part 2 are integrally formed. Specifically, the ball part 1 is a hollow structure with an outer diameter of 65 mm.

[0041] See also Figure 2 The middle wall thickness of the ball part 1 is 6-8 mm, and the wall thickness of the ball part 1 gradually increases from the middle to both ends.

[0042] The outer surface of the ball part 1 is provided with an annular groove 11, preferably, two annular grooves 11 are provided. The annular groove 11 is used to contain rubber, and increases the contact area with the rubber. The two annular grooves 11 have a smooth transition.

[0043] The connecting portion 2 is a matching installation portion, and has a rectangular cross section. The connecting holes 21 on the connecting portion 2 are used to install bolts.

[0044] Example 2

[0045] The present application also provides a method for preparing a hollow ball pin for a commercial vehicle, comprising the following steps:

[0046] Step 1: Heat and reduce the diameter of the hollow tube.

[0047] (11) Induction heating the selected hollow tube 3 to a temperature of 1100-1200° C.;

[0048] (12) The heated hollow pipe 3 is placed in a rotary forging machine for forging and reducing the diameter, so that the hollow pipe is formed into a pipe with a hollow spherical portion in the middle and hollow reduced diameter portions at both ends, thereby obtaining a reduced diameter pipe 5.

[0049] See also Figures 11 to 14 The rotary forging machine is a prior art, which is a device in which the forging die rotates around the axis of the workpiece and generates radial high-frequency strikes. When the main shaft 34 rotates, the forging die 33 and the hammer head 32 move outward in the radial direction due to the centrifugal force; when the main shaft 34 is stationary or rotates slowly, the forging die 33 can also be opened completely or partially with the help of a spring. When the main shaft 34 rotates, the hammer head 32 contacts the roller 31 supported by the roller bracket 37, and the forging die 33 begins to hammer the axis of the hollow tube 3. When the top of the hammer head 32 is located between the two rollers 31, the forging die 33 is opened to the maximum, and the hollow tube 3 can be fed forward. The roller bracket 37 is arranged in the outer ring 35. The maximum opening amount and the position of the forging die 33 when closed can be adjusted by changing the axial position of the cushion block 36. During operation, the rotation of the main shaft 34 drives the closing of the forging die 33, so that the forging die 33 continuously strikes the hollow tube 3 to deform, so that the outer diameter of the hollow tube 3 at the reduced diameter is controlled at 38mm, and the reduced diameter is achieved. During the diameter reduction process of the hollow tube 3, the forging process is as follows: Figure 3-5 As shown, by adjusting the parameters of the rotary forging machine, the outer diameter of the hollow tube 3 after the diameter reduction is controlled to 38mm, first forging one end of the hollow tube 3, adjusting the direction to forge the other side of the hollow tube 3, controlling the advancing distance of the tube end clamp to ensure the shape contour of the middle spherical part, after the rotary forging is completed, Figure 6 shown.

[0050] Step 2, shear the reduced diameter pipe 5 to obtain a shear pipe fitting 6 with symmetry at both ends, see Figure 7 .

[0051] The length of the sheared tube 6 is 180 mm.

[0052] Step 3, heating and forging the two ends of the shear pipe 6 to obtain a forged pipe 7, see Figure 8 .

[0053] The two ends of the shear pipe 6 are first heated to a temperature of 950-1050°C, and then placed in a forging die 4 for forging. Fig. 9 and Fig.10 During forging, both ends are flattened at the same time to ensure the parallelism of the mounting surfaces at both ends. Forging is completed until the upper and lower sides of the inner wall of the shear pipe are in contact with each other. After forging, the two ends change from circular to rectangular, and the hollow section in the middle is flattened into a solid structure to obtain a forged pipe 7.

[0054] Step 4, subjecting the forged pipe fitting to quenching and tempering treatment, and after quenching and tempering, the surface hardness of the forged pipe fitting 7 reaches HRC 30-35.

[0055] Step 5, cutting and punching the quenched and tempered forged pipe fitting 7 to obtain a hollow ball pin consisting of a ball portion 1 and two connecting portions 2.

[0056] The commercial vehicle hollow ball pin provided in the present application has no turning defects on the ball surface, avoiding the notch effect; the commercial hollow ball pin has a 40% lower mass than conventional conventional ball pins, thereby improving lightweight; and the one-piece molding structure greatly enhances its strength.

[0057] In the description of the present application, it should be understood that terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0058] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0059] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A hollow ball pin for a commercial vehicle, comprising a ball portion and connecting portions symmetrically connected to both sides of the ball portion, characterized in that: The ball part and the connecting part are an integrally formed structure; the ball part is a cavity structure, and the thickness of the ball part gradually increases from the middle to both ends.

2. A hollow ball pin for commercial vehicles as claimed in claim 1, characterized in that: The outer surface of the ball part is provided with an annular groove, and the annular groove is used for containing rubber.

3. A hollow ball pin for commercial vehicles as claimed in claim 2, characterized in that: The annular grooves are provided with two, and there is a smooth transition between the two annular grooves.

4. A method for preparing a hollow ball pin for a commercial vehicle, characterized in that: The following steps are involved: Step 1, heating and reducing the diameter of the hollow tube to obtain a reduced diameter tube; Step 2, shearing the reduced diameter pipe to obtain a sheared pipe fitting with symmetry at both ends; Step 3, heating and forging the two ends of the sheared pipe fitting to obtain a forged pipe fitting; Step 4, performing quenching and tempering treatment on the forged pipe fittings; Step 5, cutting and punching the quenched and tempered forged pipe fitting to obtain a hollow ball pin.

5. The method for preparing a hollow ball pin for a commercial vehicle according to claim 4, characterized in that: In step 1, the heated hollow pipe is placed in a rotary forging machine for forging and reducing the diameter, so that the hollow pipe is formed into a pipe with a hollow spherical portion in the middle and hollow reduced diameters at both ends, thereby obtaining a reduced diameter pipe.

6. A method for preparing a hollow ball pin for a commercial vehicle as claimed in claim 4, characterized in that: In step 1, the selected hollow tube is induction heated to a temperature of 1100-1200°C.

7. The method for preparing a hollow ball pin for a commercial vehicle according to claim 4, characterized in that: In step 3, both ends of the shear pipe are heated to a temperature of 950-1050°C.

8. The method for preparing a hollow ball pin for a commercial vehicle according to claim 4, characterized in that: In step 3, the heated shearing tube is placed in a forging mold for forging, and both ends of the shearing tube are flattened at the same time until the upper and lower sides of the inner wall of the shearing tube are in contact with each other.

9. A method for preparing a hollow ball pin for a commercial vehicle as claimed in claim 8, characterized in that: After forging, the two ends of the shear pipe fitting change from circular to rectangular, and the two ends of the shear pipe fitting are solid structures.

10. The method for preparing a hollow ball pin for a commercial vehicle according to claim 4, characterized in that: Step 4: After quenching and tempering, the surface hardness of the forged pipe fittings is HRC 30-35.

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