A method for efficiently obtaining swing arm products that meet the ball joint press-fit angle requirements

Abstract

This invention discloses a method for efficiently obtaining swing arm products that meet the ball joint press-fit angle requirements. The method involves rapidly press-fitting the ball joint onto the swing arm and quickly detecting the angle of the ball joint after press-fitting. The press-fit angle is continuously adjusted based on the detection data to maximize the product pass rate. The rapid press-fitting of the ball joint onto the swing arm includes rapidly clamping and positioning the swing arm from below and from above. The rapid clamping and positioning of the swing arm includes rapidly positioning the arm sleeve, including: determining the vertical press-fit axis; clamping the swing arm so that the center of the lower end of the arm sleeve is located on the press-fit axis. Its advantages are: through rapid and precise clamping and successful press-fitting, and rapid detection, swing arm products that meet the ball joint press-fit angle requirements can be efficiently obtained; no special testing platform is required, and the swing arm does not need to be leveled during testing, simplifying the operation and improving testing efficiency.

Description

Technical Field

[0001] This invention relates to a method for efficiently obtaining swing arm products that meet the requirements of ball joint press-fit angle, belonging to the field of ball joint press-fit testing technology. Background Technology

[0002] A torsion arm for rail transit is provided, with a ball joint mounted at one end and a mounting surface at the other end. The spindle in the ball joint is generally a D-shaped shaft with a D-shaped cross-section. This torsion arm has strict requirements on the pressing angle of the ball joint, requiring that the limiting surface of the D-shaped shaft be nearly parallel to the mounting surface, and the error of their deflection must not exceed ±(0.1-1°).

[0003] Currently, with the rapid development of rail transit, the demand for the aforementioned torsion arms is gradually increasing. Traditional ball joint press-fitting generally uses a base positioning device, where a vertical positioning mandrel hole is provided on the base. The shape of the mandrel hole matches the cross-section of the mandrel. During clamping, because the positioning mandrel hole on the base is blocked by the ball joint, and the gap between the mandrel and the inner wall of the positioning mandrel hole is extremely small, it is difficult for the mandrel at the lower end of the ball joint to be accurately inserted into the positioning mandrel hole. If the diameter of the positioning mandrel hole is enlarged, the mandrel will rotate significantly, leading to increased press-fitting deflection error and resulting in product defects.

[0004] Traditional ball joint press fitting mostly uses the press head of the press to apply downward pressure to the upper edge of the ball joint sleeve through the press cylinder. Since the lower end of the ball joint is manually inserted into the torsion arm sleeve, a certain degree of misalignment is inevitable, which can easily lead to unsmooth press fitting.

[0005] To ensure that all swing arms leaving the factory meet standards, the assembly angle of the ball joint is inspected after it is press-fitted onto the swing arm. The inspection uses the mounting surface of the swing arm as the reference surface and the D-shaped mandrel limiting surface as the inspection surface. The deflection angle of the mandrel limiting surface relative to the mounting surface must be within a preset range. The traditional inspection method uses a dedicated inspection platform. The press-fitted swing arm is placed on the platform, leveled using support blocks, and then an angle gauge is placed at the appropriate height using a dedicated gauge for inspection.

[0006] As can be seen from the above, traditional testing methods require the use of a dedicated testing platform, which necessitates elevation operations, increasing both the purchase cost and operational complexity. Summary of the Invention

[0007] The technical problem to be solved by this invention is: how to efficiently obtain a swing arm product that meets the requirements of the ball joint press-fit angle.

[0008] To address the above problems, the technical solution proposed by this invention is:

[0009] A method for efficiently obtaining swing arm products that meet the ball joint press-fit angle requirements involves quickly press-fitting the ball joint onto the swing arm, rapidly detecting the angle of the ball joint after press-fitting, and continuously adjusting the press-fit angle based on the detection data to maximize the product qualification rate.

[0010] The rapid press-fitting of the ball joint onto the rotating arm includes rapidly clamping and positioning the rotating arm from below and rapidly clamping and positioning the ball joint from above the rotating arm.

[0011] The rapid implementation of the upper clamping and positioning of the rotating arm includes rapid positioning of the arm sleeve, including: determining the vertical pressing axis; clamping the rotating arm so that the center of the lower end of the arm sleeve is located on the pressing axis.

[0012] The rapid implementation of the upper clamp positioning of the rotating arm also includes rapid positioning of the rotating arm's posture, including: setting a reference datum plane; adjusting the mounting end of the rotating arm so that the centerline of the arm sleeve coincides with the press-fit axis, and at the same time, aligning the mounting surface of the rotating arm with the reference datum plane.

[0013] The method of quickly clamping and positioning the ball joint above the rotating arm involves placing the lower end of the ball joint's outer sleeve at the orifice on the upper end of the arm sleeve, so that the ball joint's axis coincides with the press-fit axis and the mandrel's limiting surface is parallel to the reference datum surface.

[0014] Furthermore, a limiting component is provided above the ball joint, and a positioning mandrel hole is provided on the limiting component, the hole wall of which mates with the outer peripheral surface of the mandrel, so that the axis of the positioning mandrel hole coincides with the pressing axis and the limiting wall surface corresponding to the limiting surface of the mandrel is parallel to the reference datum surface. In application, the mandrel at the upper end of the ball joint is inserted into the positioning mandrel hole, and the outer periphery of the mandrel inserted into the positioning mandrel hole is close to the inner arm of the positioning mandrel hole.

[0015] The rapid pressing method for the ball joint on the rotating arm also includes smoothly pressing down on the ball joint. The smooth pressing down on the ball joint involves setting a pressure plate 25 with a vertical guide post to apply downward pressure to the upper end of the ball joint sleeve. The limiting member is located inside the pressure plate 25. In application, the pressure plate presses the ball joint vertically downward into the arm sleeve.

[0016] To ensure that the center of the lower end of the boom sleeve is located on the pressing axis, a pressing base is provided. The pressing base includes an outer support body and an inner positioning body. The outer support body is annular, and the inner positioning body is fitted inside the outer support body, with its upper end extending beyond the upper end of the outer support body. It can retract under pressure, and the axis of the inner positioning body coincides with the pressing axis. In application, the annular upper end face of the outer support body is used to support the outer peripheral end face of the lower end of the boom sleeve, and the upper section of the inner positioning body is used to fit into the sleeve hole of the boom sleeve to position the boom sleeve.

[0017] The method for quickly detecting the angle of the ball joint after press-fitting involves setting up a reference base plate. This reference base plate consists of a rectangular reference pressing area and a long strip angle ruler sliding area, forming a P-shaped plate. The reference pressing area can be pressed against the mounting surface of the swing arm mounting end. The end of the angle ruler sliding area near the mandrel is the measuring end. A sliding groove extending to the measuring end is provided along the length direction of the angle ruler sliding area. The bottom edge block of the right-angle curved ruler in the angle ruler is located in the sliding groove and can slide in the sliding groove.

[0018] The bottom surface of the sliding groove is parallel to the bottom surface of the reference base plate in the reference pressing area, and the bottom surface of the bottom block of the right angle ruler is in contact with the bottom surface of the sliding groove. Beneficial effects

[0019] 1. Through rapid and precise clamping and successful pressing, as well as rapid testing, we can efficiently obtain swing arm products that meet the ball joint pressing angle requirements;

[0020] 2. No dedicated testing platform is required, and the rotating arm does not need to be leveled during testing, which simplifies the operation and improves testing efficiency. Attached Figure Description

[0021] Figure 1 A three-dimensional diagram illustrating the upper clamping of the rotating arm;

[0022] Figure 2 This is a three-dimensional schematic diagram of the swing arm clamping. The main focus of the diagram is the swing arm.

[0023] Figure 3 This is a three-dimensional schematic diagram of the pressing device used in this application;

[0024] Figure 4 This is a three-dimensional schematic diagram of the positioning pressure plate, mainly showing the pressure plate at the bottom;

[0025] Figure 5 This is a three-dimensional schematic diagram of some components in the pressing device used in this application;

[0026] Figure 6 A three-dimensional schematic diagram of the reference plate during testing;

[0027] Figure 7 This is a three-dimensional schematic diagram of the angle ruler.

[0028] Figure 8 for Figure 6 A magnified view of a portion of the image;

[0029] Figure 9 This is a schematic diagram of the bottom surface of the reference base plate.

[0030] In the diagram: 1. Swing arm; 101. Arm sleeve; 102. Mounting surface; 2. Ball joint; 201. Mandrel; 2011. Limiting surface; 202. Outer sleeve; 3. Seat plate; 301. Press-fit axis; 302. Reference datum surface; 303. Guide post; 4. Press-fit base; 401. Outer sleeve support; 402. Inner sleeve positioning body; 4021. Annular top wall; 4022. Mandrel hole; 403. Spring; 5.

[0031] Positioning pressure plate; 501, pressure plate; 502, limiting component; 503, positioning mandrel hole; 5031, limiting wall surface; 504, guide hole; 6, pressure cylinder; 7, pad; 8, reference base plate; 801, reference pressing area; 802, angle ruler sliding area; 803, sliding groove; 8031, limiting groove; 9, angle ruler; 901, right angle ruler; 9011, bottom block; 902, base ruler; 903, limiting pin; 10, permanent magnet block. Detailed Implementation

[0032] The present invention will now be further described with reference to the accompanying drawings:

[0033] like Figure 1 , 2 As shown, a method for efficiently obtaining swing arm products that meet the ball joint pressing angle requirements involves rapidly pressing the ball joint 2 onto the swing arm 1, quickly detecting the angle of the ball joint after pressing, and continuously adjusting the pressing angle based on the detection data to maximize the pressing accuracy of the ball joint 2. This efficiently obtains swing arm products that meet the ball joint pressing angle requirements, avoiding the waste of materials and labor costs caused by repeated pressing. Of course, even after pressing, the swing arm products still need to undergo final inspection to reject any products that are still unqualified.

[0034] The rapid press-fitting of the ball joint 2 onto the rotating arm 1 includes rapidly clamping and positioning the rotating arm 1 from below and rapidly clamping and positioning the ball joint 2 above the rotating arm 1. Rapidly clamping and positioning the rotating arm 1 includes rapidly positioning the arm sleeve 101 of the rotating arm 1, including: determining the vertical press-fit axis 301; clamping the rotating arm 1 so that the center of the lower end of the arm sleeve 101 of the rotating arm 1 is located on the press-fit axis 301.

[0035] like Figure 2 , 3As shown in Figure 5, to ensure that the center of the lower end of the arm sleeve 101 of the rotating arm 1 is located on the pressing axis 301, a pressing base 4 is provided. The pressing base 4 includes an outer support body 401, an inner positioning body 402, and a spring 403. An annular top wall 4021 is provided on the upper part of the inner wall of the inner positioning body 402, and a spindle hole 4022 is provided in the center of the annular top wall 4021. The inner positioning body 402 is fitted inside the outer support body 401, and the spring 403 is placed inside the inner positioning body 402. Inside the inner sleeve positioning body 402, the upper end abuts against the annular top wall 4021, and the lower end presses against the seat plate 3. This allows the upper section of the inner sleeve positioning body 402 to be pushed upwards out of the upper end of the outer sleeve support body 401. The axis of the inner sleeve positioning body 402 coincides with the pressing axis 301. In application, the annular upper end face of the outer sleeve support body 401 is used to support the outer peripheral end face of the lower end of the arm sleeve 101 of the rotating arm. The upper section of the inner sleeve positioning body 402 is used to fit into the sleeve hole of the arm sleeve 101 to position the arm sleeve 101. When the ball joint 2 is pressed into the sleeve hole of the arm sleeve 101, the inner sleeve positioning body 402 can be compressed downwards into the outer sleeve support body 401, ensuring the smooth completion of the pressing.

[0036] The aforementioned rapid clamping and positioning of the rotating arm 1 also includes rapid positioning of the rotating arm 1's posture, including: setting a reference datum surface 302; adjusting the mounting end of the rotating arm 1 so that the axis of the arm sleeve 101 coincides with the press-fit axis 301, and simultaneously aligning the mounting surface 102 of the rotating arm 1 with the reference datum surface 302. An optional implementation is to provide a support 7 for the mounting end of the rotating arm 1, and to rapidly position the rotating arm 1 by setting the height of the support 7 and adjusting its placement.

[0037] like Figure 1As shown in Figure 4, the above-mentioned rapid upper clamping and positioning of the ball joint 2 above the rotating arm 1 involves placing the lower end of the outer sleeve 202 of the ball joint 2 at the orifice of the upper end of the arm sleeve 101, so that the axis of the ball joint 2 coincides with the press-fit axis 301 and the limiting surface 2011 of the spindle 201 is parallel to the reference datum surface 302. One possible implementation is as follows: A limiting member 502 is provided above the ball joint 2, and a positioning mandrel hole 503 is provided on the limiting member 502, the hole wall of which mates with the outer peripheral surface of the mandrel 201, so that the axis of the positioning mandrel hole 503 coincides with the pressing axis 301 and the limiting wall surface 5031 corresponding to the limiting surface 2011 of the mandrel 201 is parallel to the reference datum surface 302. In application, the mandrel 201 at the upper end of the ball joint 2 is inserted into the positioning mandrel hole 503, and the outer periphery of the mandrel 201 inserted into the positioning mandrel hole 503 is close to the inner arm of the positioning mandrel hole 503. Because the positioning mandrel hole 25 for positioning the mandrel 201 is located at the top, it is clear whether the mandrel 201 at the upper end of the ball joint 2 is aligned with the positioning mandrel hole 503 during clamping. By rotating the placement angle of the ball joint 2, the mandrel 201 can be easily fitted into the positioning mandrel hole 503. When the mandrel 201 is fitted into the positioning mandrel hole 503, it indicates that the angle at which the ball joint 2 is pressed into the sleeve hole of the rotating arm 1 is closest to the standard value, which can be confirmed by inspection after pressing. Since it is clear to observe whether the mandrel 201 is aligned with the positioning mandrel hole 503, there is no need to increase the fitting clearance between the positioning mandrel hole 503 and the mandrel 201. There is no possibility of the ball joint 2 deflecting during pressing, thus ensuring the pressing progress and improving the yield rate.

[0038] The aforementioned method for quickly pressing the ball joint 2 onto the rotating arm 1 further includes smoothly pressing down on the ball joint 2. This smooth pressing down involves setting up a pressure plate 501, guided by a vertical guide post 303, to apply downward pressure to the upper end of the ball joint 2 outer sleeve 202. The limiting member 502 is located within the pressure plate 501. In application, the pressure plate 501 presses the ball joint 2 vertically downward into the arm sleeve 101. Because the pressure plate 501 is constrained by the guide post 303, it ensures that the force around the ball joint outer sleeve 202 is uniform during pressing, preventing skewing.

[0039] The downward pressure of the pressure plate 501 can be achieved by the press acting on the pressure plate 501 through the pressure cylinder 6.

[0040] The aforementioned pressure plate 501 is mounted on the positioning pressure plate 5. There are two guide posts 303. The positioning pressure plate 5 is square, with a guide hole 504 at each of its four corners. The distance between two adjacent guide holes 504 is equal to the distance between the two guide posts 303. Thus, when it is necessary to rotate the positioning mandrel hole 503, this can be achieved by switching the two guide posts 303 between adjacent guide holes 504.

[0041] like Figure 6 As shown in Figure 9, the above-mentioned rapid detection of the angle of the ball joint after press-fitting is carried out by setting a reference plate 8. The reference plate 8 is a P-shaped plate composed of a rectangular reference pressing area 801 and a long strip angle ruler sliding area 802. The reference pressing area 801 can be pressed against the mounting surface of the mounting end of the rotating arm 1. During measurement, the end of the angle ruler sliding area 802 closest to the spindle 201 is the measuring end. A sliding groove 803 extending to the measuring end is provided along the length direction of the angle ruler sliding area 802. The bottom block 9011 of the right angle ruler 901 in the angle ruler 9 is located in the sliding groove 803 and can slide in the sliding groove 803. In application, the reference pressing area 801 of the reference base plate 8 is pressed against the mounting surface of the mounting end of the rotating arm 1. The angle ruler 9 is slid along the sliding groove 803 to the measuring end near the spindle 201, so that the bottom surface of the bottom block 9011 of the right angle ruler 901 is parallel to the surface of the reference base plate 8. Then, the bottom surface of the base scale 902 of the angle ruler 9 is brought into contact with the limiting surface 2011 of the spindle 201. The reading on the angle ruler then yields the angle formed by the limiting surface 2011 of the spindle 201 and the mounting surface of the rotating arm 1. In this way, by setting up a reference base plate 8, the traditional dedicated testing platform is replaced, greatly reducing the equipment purchase cost. At the same time, using the reference base plate provided in this application, the rotating arm 1 does not need to be leveled during operation, making the testing operation very simple and efficient.

[0042] The bottom surface of the sliding groove 803 is parallel to the bottom surface of the reference base plate 8 of the reference pressing area 801, and the bottom surface of the bottom block 9011 of the right angle ruler 901 is in contact with the bottom surface of the sliding groove 803. In this way, during the inspection, as long as the bottom surface of the bottom block 9011 of the right angle ruler 901 is in contact with the bottom surface of the sliding groove 803, it can be ensured that the bottom surface of the bottom block 9011 of the right angle ruler 901 is parallel to the mounting surface 102 of the rotating arm 1.

[0043] Furthermore, limiting grooves 8031 ​​are provided on the side walls of both sides of the sliding groove 803 to limit the limiting pins 903 that are horizontally set on both sides of the bottom block 9011 of the right angle ruler 901. In this way, the angle ruler can be installed in the sliding groove 803, and the bottom surface of the bottom block 9011 of the right angle ruler 901 is kept in contact with the bottom surface of the groove 803.

[0044] Permanent magnet blocks 10 are provided at both ends of the bottom surface of the reference pressing area 801 to hold the reference base plate 8 firmly on the mounting surface 102 of the mounting end of the rotating arm 1. In this way, it is not necessary to press the reference pressing area 801 of the reference base plate 8 onto the mounting surface 102 of the mounting end of the rotating arm 1 by hand during measurement.

[0045] The above embodiments are only used to describe the present invention more clearly, and should not be regarded as limiting the scope of protection covered by the present invention. Any equivalent modifications should be regarded as falling within the scope of protection covered by the present invention.

Claims

1. A device for efficiently obtaining swing arm products that meet the ball joint press-fit angle requirements, characterized in that: The system includes a ball joint press-fitting device for a swing arm and a reference base plate for measuring the press-fitting angle of the ball joint in the swing arm. The ball joint press-fitting device includes a press-fitting base and a press cylinder, as well as a base plate, two guide pillars mounted on the left end of the base plate, and a positioning pressure plate fitted onto the two guide pillars through guide holes. The press-fitting base is placed on the base plate on the right side of the two guide pillars, and has a mandrel hole in the middle to accommodate the lower end mandrel of the ball joint. The positioning pressure plate is located above the press-fitting base and can slide up and down along the guide pillars, and has a positioning mandrel hole in the middle whose inner surface matches the outer surface of the upper end mandrel of the ball joint. In application, the outer periphery of the lower end of the swing arm sleeve is pressed against the periphery of the press-fitting base, and the lower end of the outer sleeve of the ball joint is placed in the opening of the swing arm sleeve. The mandrel at the upper end of the ball joint is inserted into the positioning mandrel hole. The lower bottom surface of the positioning pressure plate presses against the upper end surface of the ball joint's outer sleeve, and the positioning pressure plate is pressed down by the pressure cylinder. The reference base plate is a P-shaped plate composed of a rectangular reference pressing area and a long strip angle ruler sliding area. The reference pressing area can press against the mounting surface of the rotating arm mounting end. During measurement, the end of the angle ruler sliding area closest to the mandrel is the measuring end. A sliding groove extending to the measuring end is provided along the length direction of the angle ruler sliding area. The bottom edge block of the right-angle ruler in the angle ruler is located in the sliding groove and can slide in the sliding groove. The bottom surface of the sliding groove is parallel to the bottom surface of the reference base plate of the reference pressing area, and the bottom surface of the bottom edge block of the right-angle ruler is in contact with the bottom surface of the sliding groove.

2. A method for efficiently obtaining a swing arm product that meets the ball joint press-fit angle requirements using the device described in claim 1, characterized in that: The ball joint is quickly pressed onto the rotating arm, and the angle of the ball joint after pressing is quickly detected. The pressing angle is continuously adjusted based on the detection data to maximize the product qualification rate. The quick pressing of the ball joint onto the rotating arm includes quickly clamping and positioning the upper part of the rotating arm from below and quickly clamping and positioning the ball joint from above the rotating arm. The rapid implementation of the upper clamping and positioning of the rotating arm includes rapid positioning of the arm sleeve, including: determining the vertical pressing axis; clamping the rotating arm so that the center of the lower end of the arm sleeve is located on the pressing axis; the rapid implementation of the upper clamping and positioning of the rotating arm also includes rapid positioning of the rotating arm's posture, including: setting a reference datum plane; adjusting the mounting end of the rotating arm so that the axis of the arm sleeve coincides with the pressing axis, and simultaneously aligning the mounting surface of the rotating arm with the reference datum plane; the rapid implementation of the upper clamping and positioning of the ball joint above the rotating arm involves the outer sleeve of the ball joint... The lower end is placed at the orifice at the upper end of the arm sleeve, so that the axis of the ball joint is aligned with the pressing axis and the limiting surface of the mandrel is parallel to the reference datum surface. During rapid testing, the reference pressing area of ​​the reference base plate is pressed onto the mounting surface of the rotating arm mounting end. The angle ruler is slid along the sliding groove to the measuring end near the mandrel, so that the bottom surface of the bottom block of the right angle ruler is parallel to the surface of the reference base plate. Then, the bottom surface of the base of the angle ruler is brought into contact with the limiting surface of the mandrel. The reading on the angle ruler is then taken to obtain the size of the angle formed by the limiting surface of the mandrel and the mounting surface of the rotating arm.

3. The method for efficiently obtaining a swing arm product that meets the ball joint press-fit angle requirements according to claim 2, characterized in that: A limiting component is set above the ball joint. A positioning mandrel hole is set on the limiting component, and the hole wall is matched with the outer peripheral surface of the mandrel. The center line of the positioning mandrel hole is aligned with the pressing axis, and the limiting wall surface corresponding to the limiting surface of the mandrel is parallel to the reference datum surface. In application, the mandrel at the upper end of the ball joint is inserted into the positioning mandrel hole, and the outer periphery of the mandrel inserted into the positioning mandrel hole is close to the inner arm of the positioning mandrel hole.

4. The method for efficiently obtaining a swing arm product that meets the ball joint press-fit angle requirements according to claim 3, characterized in that: The rapid pressing method for the ball joint on the swing arm also includes smoothly pressing down on the ball joint. The smooth pressing down on the ball joint involves setting a pressure plate with a vertical guide post to apply downward pressure to the upper end of the ball joint sleeve. The limiting member is located inside the pressure plate. In application, the pressure plate presses the ball joint vertically downward into the arm sleeve.

5. The method for efficiently obtaining a swing arm product that meets the ball joint press-fit angle requirements according to claim 2, characterized in that: To ensure that the center of the lower end of the boom sleeve is located on the pressing axis, a pressing base is provided. The pressing base includes an outer support body and an inner positioning body. The outer support body is annular, and the inner positioning body is fitted inside the outer support body, with its upper end extending beyond the upper end of the outer support body. It can retract under pressure, and the axis of the inner positioning body coincides with the pressing axis. In application, the annular upper end face of the outer support body is used to support the outer peripheral end face of the lower end of the boom sleeve, and the upper section of the inner positioning body is used to fit into the sleeve hole of the boom sleeve to position the boom sleeve.

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