Front subframe bushing press-fitting device and press-fitting process

Abstract

This invention discloses a front subframe bushing pressing device and pressing process, relating to the field of automotive front subframe assemblies. It includes a worktable with several auxiliary positioning blocks fixed on it for supporting the front subframe. A servo press mounting base is provided on the worktable between the auxiliary positioning blocks for mounting the servo press. A product stop is provided on the side of the servo press mounting base opposite to the servo press. An anti-misalignment guide head is slidably inserted through the product stop. Driven by a positioning cylinder, the anti-misalignment guide head is inserted into the sleeve of the front subframe, and a bushing is coaxially mounted on the anti-misalignment guide head. A sliding connecting seat is provided on the servo press mounting base between the servo press and the product stop. The press head of the servo press protrudes from the servo press mounting base and pushes the sliding connecting seat axially, causing the bushing press head fixed on the sliding connecting seat to press the bushing tightly against the sleeve. This invention solves the problem of uncontrollable force and speed during the pressing process, ensures coaxiality during pressing, and improves the quality of the pressed product.

Description

Technical Field

[0001] This invention relates to the field of automotive front subframe assembly, and more specifically to a front subframe bushing pressing device and pressing process. Background Technology

[0002] The front subframe bushing plays a crucial role in preventing vibration and impact loads, and cushioning chassis shocks within the automotive front subframe. It also contributes to vehicle comfort and noise control. Therefore, the precision of the bushing's press-fit dimensions directly affects the quality of the automotive front subframe.

[0003] Currently, domestic manufacturers use hard hydraulic compression to press in these bushings. The pressing speed is generally quite fast, but there is no monitoring of force or displacement. The bushings are also placed manually, resulting in poor concentricity. Therefore, the following defects exist:

[0004] 1. Hydraulic pressing can easily cause internal damage to the bushing due to the uncontrollable pressing speed, thus affecting the service life of the bushing;

[0005] 2. Because there is no force and displacement monitoring function during the pressing process, damage to the inside of the bushing cannot be monitored;

[0006] 3. Bushings are mostly placed by hand, which makes it impossible to achieve concentricity, often resulting in damage to the cut edges of the bushings. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a front subframe bushing pressing device and pressing process, which solves the problem of uncontrollable force and speed during the pressing process, ensures the coaxiality of the pressing, and improves the quality of the pressed products.

[0008] The objective of this invention is achieved through the following technical solution: This front subframe bushing pressing device includes a worktable, on which several auxiliary positioning blocks are fixed for supporting the front subframe. A servo press mounting base is provided on the worktable between each auxiliary positioning block for mounting the servo press. A product stop is provided on the side of the servo press mounting base opposite to the servo press. An anti-misalignment guide head is slidably inserted on the product stop. The anti-misalignment guide head, driven by a positioning cylinder, is used to insert into the sleeve of the front subframe for positioning, and also for coaxially fitting the bushing. A sliding connecting seat is slidably provided on the servo press mounting base between the servo press and the product stop. The press head of the servo press protrudes from the servo press mounting base and is used to push the sliding connecting seat axially, so that the bushing press head fixed on the sliding connecting seat presses the bushing and the sleeve tightly.

[0009] As a further technical solution, a linear guide rail is provided on the servo press mounting base along the axial direction of the servo press, and the sliding connecting seat is slidably mounted on the linear guide rail via a slider.

[0010] As a further technical solution, a positioning bracket is provided on the side of the product block away from the sliding connecting seat for installing a positioning cylinder. A connecting block is fixed on the side of the anti-misalignment guide head away from the sliding connecting seat, and the piston rod of the positioning cylinder is connected to drive the anti-misalignment guide head through the connecting block.

[0011] As a further technical solution, a guide rod is provided on the connecting block, and the guide rod is slidably installed on the positioning bracket to guide the anti-misalignment guide head.

[0012] As a further technical solution, a positioning rod is provided on the side of the anti-misalignment guide head facing the sliding connection seat, which is used to insert into the center hole of the bushing to achieve coaxial positioning of the bushing and the anti-misalignment guide head.

[0013] As a further technical solution, the side of the anti-misalignment guide head facing the sliding connecting seat is also provided with an anti-misalignment protrusion, which is used to cooperate with the notch on the bushing to achieve anti-misalignment positioning.

[0014] As a further technical solution, a conical surface is provided on the side of the error-proof guide head facing the sliding connection seat, and the conical surface is used to guide the error-proof guide head into the sleeve.

[0015] A front subframe bushing press-fitting process, employing the aforementioned front subframe bushing press-fitting device, includes the following steps:

[0016] Step 1: Place the front subframe on the auxiliary positioning block to initially position the front subframe;

[0017] Step 2: Activate the positioning cylinder to drive the anti-misalignment guide head, so that the anti-misalignment guide head is inserted into the sleeve for precise positioning of the front subframe;

[0018] Step 3: The operator places the bushing onto the positioning rod of the anti-misalignment guide head that passes through the sleeve, so as to achieve coaxial positioning of the sleeve and the bushing;

[0019] Step 4: Start the servo press. The press head of the servo press pushes the sliding connecting seat, which in turn drives the bushing press head to press the bushing into the sleeve. The servo press measures the force and displacement data during the pressing process in real time, and plots the pressing data curve, which is then output to the control terminal.

[0020] Step 5: After pressing into place, the positioning cylinder and servo press automatically retract. The control terminal compares the pressing data curve obtained in Step 4 with the preset parameters to determine the pass / fail status, and the pressing is completed.

[0021] As a further technical solution, in step three, when installing the bushing, the notch of the bushing is aligned with the error-proof protrusion of the error-proof guide head to achieve error-proof positioning.

[0022] As a further technical solution, in step five, if the pressing data curve meets the preset parameter requirements, the control terminal issues a green light signal, and the operator removes the qualified pressing front subframe and places it into the subsequent production line; if the pressing data curve does not meet the preset parameter requirements, the control terminal issues a red light signal, and the operator removes the unqualified pressing front subframe and places it into the unqualified product production line.

[0023] The beneficial effects of this invention are as follows:

[0024] 1. This device is a servo press-fitting device with a linear guide rail mechanism at the bottom. The pressing speed of the servo press is controllable, which solves the problem of uncontrollable force and speed during the pressing process, thereby ensuring the quality of the pressing process.

[0025] 2. The servo press is driven by a servo electric cylinder, which can monitor the force and displacement data during the bushing pressing process in real time and draw curves. It will automatically alarm when abnormal curves are detected, thus completely eliminating the pressing of unqualified parts.

[0026] 3. The bushing positioning of this device adopts a floating guide mechanism (anti-misalignment guide head). The anti-misalignment guide head is simultaneously inserted into the sleeve and the bushing to achieve high-precision positioning of the sleeve and the bushing, ensure the coaxiality of the press fitting, prevent the bushing from being pressed off-center, and improve the first-pass yield.

[0027] 4. The anti-misalignment guide head is equipped with anti-misalignment protrusions that can cooperate with the notches on the bushing to prevent the bushing from deflecting or misaligning during press-fitting. The anti-misalignment guide head is also equipped with a conical surface, which can quickly guide the bushing into the sleeve and improve press-fitting efficiency. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the present invention.

[0029] Figure 2 This is a schematic diagram of the structure during the press-fitting process of the present invention.

[0030] Figure 3 This is a schematic diagram of the front subframe without the bushings pressed in, as described in this invention.

[0031] Figure 4 This is a schematic diagram of the structure of the front subframe after the bushing is pressed in, according to the present invention.

[0032] Figure 5 This is a schematic diagram of the anti-misoperation guide head in this invention.

[0033] Figure 6 This is a schematic diagram of the connection structure between the servo press mounting base and the product stop block in this invention.

[0034] Figure 7 This is a schematic diagram of the bushing structure in this invention.

[0035] Explanation of reference numerals in the attached drawings: 1. Worktable; 2. Auxiliary positioning block; 3. Linear guide rail; 4. Servo press; 5. Servo press mounting base; 6. Sliding connecting base; 7. Bushing press head; 8. Anti-misalignment guide head; 9. Product stop block; 10. Connecting block; 11. Guide rod; 12. Positioning bracket; 13. Positioning cylinder; 14. Front subframe; 15. Sleeve; 16. Bushing; 17. Notch; 18. Positioning rod; 19. Anti-misalignment protrusion; 20. Conical surface; 21. Center hole. Detailed Implementation

[0036] The present invention will now be described in detail with reference to the accompanying drawings:

[0037] Example: As attached Figures 1-7 As shown, this front subframe bushing pressing device includes a worktable 1, an auxiliary positioning block 2, a linear guide rail 3, a servo press 4, a servo press mounting base 5, a sliding connecting base 6, a bushing pressing head 7, an anti-misalignment guide head 8, a product stop block 9, a connecting block 10, a guide rod 11, a positioning bracket 12, a positioning cylinder 13, a front subframe 14, a sleeve 15, a bushing 16, a notch 17, a positioning rod 18, an anti-misalignment protrusion 19, a conical surface 20, and a center hole 21.

[0038] Reference Appendix Figure 1 Three auxiliary positioning blocks 2 are fixed on the worktable 1 (their number and fixed position can be adjusted according to the model and specifications of the front subframe 14) to support (initially position) the front subframe 14. A servo press mounting base 5 is set on the worktable 1 between each auxiliary positioning block 2. The servo press 4 is installed at one end of the servo press mounting base 5. A product stop block 9 is set on the side of the servo press mounting base 5 away from the servo press 4. A linear guide rail 3 is set on the servo press mounting base 5 along the axial direction of the servo press 4. A sliding connecting seat 6 is slidably mounted on the linear guide rail 3 via a slider. A misalignment guide head 8 is slidably mounted on the product stop block 9. A positioning bracket 12 is provided on the side of the product stop block 9 opposite to the sliding connecting seat 6. A positioning cylinder 13 is mounted on the positioning bracket 12. A connecting block 10 is fixedly installed on the side of the misalignment guide head 8 opposite to the sliding connecting seat 6. The piston rod of the positioning cylinder 13 is connected to the misalignment guide head 8 through the connecting block 10, causing the misalignment guide head 8 to insert into the sleeve 15 of the front subframe 14 for positioning. Further, such as... Figure 5 , 6 As shown, a guide rod 11 is provided on the connecting block 10. The guide rod 11 is slidably mounted on the positioning bracket 12 to guide the horizontal sliding (sliding along the axial direction of the servo press 4) of the error-proof guide head 8. Preferably, a positioning rod 18 is provided at the center of the side of the error-proof guide head 8 facing the sliding connecting seat 6. After the error-proof guide head 8 passes through the sleeve 15, the center hole 21 of the bushing 16 is then fitted onto the positioning rod 18 to achieve coaxial positioning of the bushing 16 and the error-proof guide head 8. An error-proof protrusion 19 is also provided on the side of the error-proof guide head 8 facing the sliding connecting seat 6, such as... Figure 7 As shown, the error-proof protrusion 19 can cooperate with the notch 17 on the bushing 16 to achieve error-proof positioning. Preferably, a conical surface 20 is also provided on the side of the error-proof guide head 8 facing the sliding connecting seat 6. The conical surface 20 facilitates guiding the error-proof guide head 8 into the sleeve 15. The pressure head of the servo press 4 protrudes from the servo press fixing seat 5. When the servo press 4 is working, the pressure head of the servo press 4 pushes the sliding connecting seat 6 axially, so that the bushing pressure head 7 fixed on the sliding connecting seat 6 presses the bushing 16 and the sleeve 15 tightly. Figure 3 , 4 As shown.

[0039] like Figure 1 , 2 As shown, a front subframe bushing press-fitting process, using the aforementioned front subframe bushing press-fitting device, includes the following steps:

[0040] Step 1: Place the front subframe 14 on the auxiliary positioning block 2 to initially position the front subframe 14;

[0041] Step 2: Start the positioning cylinder 13. The piston rod of the positioning cylinder 13 pushes the connecting block 10. Under the guidance of the guide rod 11, the connecting block 10 drives the anti-misalignment guide head 8 to slide horizontally (relative to the axial movement of the servo press 4), so that the anti-misalignment guide head 8 is inserted into the sleeve 15, thereby accurately positioning the front subframe 14.

[0042] Step 3: The operator places the bushing 16 onto the positioning rod 18 of the error-proof guide head 8 after passing through the sleeve 15, so as to achieve coaxial positioning of the sleeve 15 and the bushing 16; preferably, when installing the bushing 16, the notch 17 of the bushing 16 is aligned with the error-proof protrusion 19 of the error-proof guide head 8 to achieve error-proof positioning.

[0043] Step 4: Start the servo press 4. The axial movement of the press head of the servo press 4 pushes the sliding connecting seat 6, which in turn drives the bushing press head 7 to press the bushing 16 into the sleeve 15. The servo press 4 measures the force and displacement data during the pressing process in real time, and plots the pressing data curve, which is then output to the control terminal.

[0044] Step 5: After pressing into place, the positioning cylinder 13 and servo press 4 automatically retract. The control terminal compares the pressing data curve obtained in Step 4 with the preset parameters to determine its pass / fail status. If the pressing data curve meets the preset parameter requirements, the control terminal issues a green light signal, and the operator removes the press-fitted front subframe 14 and places it into the subsequent production line, completing the pressing process. If the pressing data curve does not meet the preset parameter requirements, the control terminal issues a red light signal, and the operator removes the press-fitted unqualified front subframe 14 and places it into the unqualified product production line, waiting for the next pressing.

[0045] This invention provides pressing power through a servo press, solving the problem of uncontrollable force and speed during the pressing process. The servo press monitors the force and displacement data during the pressing process in real time and plots the pressing data curve, completely eliminating the pressing of unqualified products. Before pressing, an error-proof guide head is pre-inserted into the sleeve of the front subframe, and the bushing is coaxially fitted onto the error-proof guide head to ensure that the bushing and sleeve are coaxial and centered, guaranteeing the coaxiality of the pressing and improving the quality of the pressed products.

[0046] It is understood that, for those skilled in the art, any equivalent substitutions or modifications to the technical solutions and inventive concepts of this invention should fall within the scope of protection of the appended claims.

Claims

1. A front subframe bushing pressing device, characterized in that: The system includes a workbench (1), on which several auxiliary positioning blocks (2) are fixed to support the front subframe (14). A servo press mounting base (5) is set on the workbench (1) between each auxiliary positioning block (2) for installing the servo press (4). A product stop block (9) is set on the side of the servo press mounting base (5) away from the servo press (4). An anti-misoperation guide head (8) is slidably inserted on the product stop block (9). The anti-misoperation guide head (8) driven by the positioning cylinder (13) is used for inserting... Positioning is achieved within the sleeve (15) of the front subframe (14), and the anti-misalignment guide head (8) is also used for coaxially mounting the bushing (16); a sliding connecting seat (6) is slidably provided on the servo press fixed seat (5) between the servo press (4) and the product stop (9), and the press head of the servo press (4) protrudes from the servo press fixed seat (5) to push the sliding connecting seat (6) axially, so that the bushing press head (7) fixed on the sliding connecting seat (6) presses the bushing (16) and the sleeve (15) together; The error-proof guide head (8) is provided with a positioning rod (18) on the side facing the sliding connecting seat (6), which is used to insert into the center hole (21) of the bushing (16) to achieve coaxial positioning of the bushing (16) and the error-proof guide head (8).

2. The front subframe bushing pressing device according to claim 1, characterized in that: The servo press mounting base (5) is provided with a linear guide rail (3) along the axial direction of the servo press (4), and the sliding connecting base (6) is slidably mounted on the linear guide rail (3) by a slider.

3. The front subframe bushing pressing device according to claim 1, characterized in that: The product stop (9) is provided with a positioning bracket (12) on the side away from the sliding connecting seat (6) for installing the positioning cylinder (13). The anti-mistake guide head (8) is fixed with a connecting block (10) on the side away from the sliding connecting seat (6). The piston rod of the positioning cylinder (13) is connected to drive the anti-mistake guide head (8) through the connecting block (10).

4. The front subframe bushing pressing device according to claim 3, characterized in that: A guide rod (11) is provided on the connecting block (10). The guide rod (11) is slidably installed on the positioning bracket (12) to guide the anti-misoperation guide head (8).

5. The front subframe bushing pressing device according to claim 1, characterized in that: The anti-misalignment guide head (8) is also provided with an anti-misalignment protrusion (19) on the side facing the sliding connecting seat (6), which is used to cooperate with the notch (17) on the bushing (16) to achieve anti-misalignment positioning.

6. The front subframe bushing pressing device according to claim 1, characterized in that: The anti-mistake guide head (8) has a conical surface (20) on one side facing the sliding connecting seat (6), and the conical surface (20) is used to guide the anti-mistake guide head (8) into the sleeve (15).

7. A front subframe bushing press-fitting process, employing the front subframe bushing press-fitting device as described in any one of claims 1 to 6, characterized in that, Includes the following steps: Step 1: Place the front subframe (14) on the auxiliary positioning block (2) to initially position the front subframe (14); Step 2: Start the positioning cylinder (13) to drive the anti-misalignment guide head (8) so that the anti-misalignment guide head (8) is inserted into the sleeve (15) to precisely position the front subframe (14); Step 3: The operator puts the bushing (16) onto the positioning rod (18) of the anti-misalignment guide head (8) that passes through the sleeve (15) to achieve coaxial positioning of the sleeve (15) and the bushing (16); Step 4: Start the servo press (4). The press head of the servo press (4) pushes the sliding connecting seat (6), which drives the bushing press head (7) to press the bushing (16) into the sleeve (15). The servo press (4) measures the force and displacement data during the pressing process in real time, and plots the pressing data curve and outputs it to the control terminal. Step 5: After pressing into place, the positioning cylinder (13) and servo press (4) automatically retract. The control end compares the pressing data curve obtained in step 4 with the preset parameters to make a qualification judgment, and the pressing is completed.

8. The front subframe bushing press-fitting process according to claim 7, characterized in that: In step three, when installing the bushing (16), the notch (17) of the bushing (16) is aligned with the error-proof protrusion (19) of the error-proof guide head (8) to achieve error-proof positioning.

9. The front subframe bushing press-fitting process according to claim 7 or 8, characterized in that: In step five, if the pressing data curve meets the preset parameter requirements, the control terminal issues a green light signal, and the operator removes the qualified pressing front subframe (14) and places it into the subsequent production line; if the pressing data curve does not meet the preset parameter requirements, the control terminal issues a red light signal, and the operator removes the unqualified pressing front subframe (14) and places it into the unqualified product production line.

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