Engine shock absorber bracket press-fitting equipment

Abstract

This application discloses an engine shock absorber bracket press-fitting device, belonging to the field of automotive parts assembly technology. It includes an upper and lower template connected to a press. An upper mounting seat is provided on the bottom surface of the upper template, and rotating pressure head assemblies are provided on both sides of the upper mounting seat. The rotating pressure head assemblies press the housing onto the upper mounting seat. The top surface of the lower template is provided with a lower mounting seat, a slider, and a slide rail. The slider is connected to a power cylinder and is movably mounted on the slide rail. A positioning post is installed on the top surface of the slider. The main spring is placed on the lower mounting seat, and the positioning post passes through the main spring. The power cylinder moves the positioning post to compress the main spring. The press drives the upper template to press down, pressing the housing onto the main spring. Pre-compression of the main spring before pressing the housing avoids wear on the rubber parts of the main spring caused by direct pressing, thus improving the press-fitting quality and production efficiency of the engine shock absorber bracket.

Description

Technical Field

[0001] This application relates to the field of automotive parts assembly technology, and in particular to an engine shock absorber bracket press-fitting device. Background Technology

[0002] In the automotive manufacturing industry, engine shock absorber brackets are key connecting components, and their assembly accuracy and quality directly affect the engine's operational stability and the overall vehicle's comfort. The production and processing of automotive engine shock absorber brackets involves press-fitting. Relevant existing technologies, such as the Chinese patent application "An Automatic Press-fitting Device for Automotive Shock Absorbers" (application number: CN202111270118.2), disclose a device comprising a body, an electric slide rail, a hydraulic cylinder, and a base. The electric slide rail is located on the left and right sides of the inner cavity of the body, the hydraulic cylinder is fixedly connected to the top of the inner cavity of the body by bolts, and the base is located at the bottom of the inner cavity of the body. Adjustable feet are fixedly connected to the four corners of the bottom of the body. This automatic press-fitting device for automotive shock absorbers has a reasonable structural design, enabling the working size of the positioning sleeve to be adjusted according to the size of the bushing, eliminating the need for repeated replacement of the positioning sleeve by operators, fundamentally reducing the actual operational content. Simultaneously, the base itself has a shock-absorbing effect, thereby avoiding impact damage to the precision components inside the body, and effectively reducing the number of times the outer wall of the shock absorber housing needs to be stamped.

[0003] Existing engine shock absorber bracket press-fitting equipment has certain shortcomings in practical applications. Common engine shock absorber bracket press-fitting equipment typically presses the housing directly onto the main spring to achieve assembly. However, this direct press-fitting method has significant drawbacks. Because the main spring contains rubber components, direct press-fitting of the housing may cause excessive compression and wear on these rubber components, leading to changes in their shape and performance degradation, thus affecting the normal operation and service life of the shock absorber bracket.

[0004] Moreover, this direct pressing method often makes it difficult to precisely control the pressing force and position, easily leading to inaccurate pressing. This not only reduces production efficiency but may also increase the defect rate, raise production costs, and cause numerous problems for the automotive manufacturing industry. Utility Model Content

[0005] The technical problem to be solved by this application is to provide an engine shock absorber bracket press-fitting device that pre-compresses the main spring before pressing the housing, thereby avoiding wear on the rubber parts of the main spring caused by direct pressing of the housing, and improving the press-fitting quality and production efficiency of the engine shock absorber bracket.

[0006] The technical solution adopted in this application is: an engine shock absorber bracket pressing device, including an upper template and a lower template connected to a press. The bottom surface of the upper template is provided with an upper mounting seat, and both sides of the upper mounting seat are provided with rotating pressing head assemblies. The rotating pressing head assemblies work to press the shell onto the upper mounting seat. The top surface of the lower template is provided with a lower mounting seat, a slider and a slide rail. The slider is connected to a power cylinder and is movably mounted on the slide rail. A positioning post is installed on the top surface of the slider. The main spring is placed on the lower mounting seat, and the positioning post passes through the main spring. The power cylinder works to drive the positioning post to move and squeeze the main spring. The press works to drive the upper template to press down and press the shell onto the outside of the main spring.

[0007] Compared with the prior art, the advantage of this application is that the main spring is pre-compressed by moving the positioning column through the power cylinder, which avoids excessive compression and wear of the rubber parts in the main spring caused by the direct pressing of the housing, effectively preventing changes in the shape and performance degradation of the rubber parts, ensuring the normal use effect of the engine shock absorber bracket and extending its service life.

[0008] Pre-pressing the main spring before pressing ensures it is in the correct position, which helps to more accurately press the shell onto the main spring when the press drives the upper template downwards. This reduces pressing inaccuracies, improves pressing quality and production efficiency, lowers the defect rate, and saves production costs.

[0009] Each component in this application has a clear division of labor and works closely together. The rotating pressure head assembly is responsible for pressing the housing onto the upper mounting base, providing stable support for subsequent pressing; the components on the lower template work together to pre-press and position the main spring, ensuring that the entire pressing process proceeds smoothly.

[0010] For ease of description, this application uses the accompanying drawings as an example. Figure 1 The description is based on the principle of "front side" (the side closer to the manual operation) and "rear side" (the side farther from the manual operation).

[0011] In some embodiments of this application, the upper mounting base includes a limiting block and a front top block and a rear top block spaced apart on the bottom surface of the upper template. The front top block and the rear top block are placed against the top surface of the housing. The bottom of the limiting block is a resting part, which is located below the rear top block and has a stepped structure.

[0012] The design of the limiting blocks, front top blocks, and rear top blocks enables stable pre-fixation of the housing. The stepped placement of the limiting blocks provides a layered support structure for the rear end of the housing, allowing it to be effectively pressed together with the rear top blocks after being placed on them. This structural design ensures that the housing will not shift due to force during subsequent pressing, improving the accuracy of the pressing process.

[0013] In some embodiments of this application, the upper mounting base further includes two left and right positioning guide pins. The positioning guide pins are located below the upper template and are parallel to the lower template. The housing is installed onto the upper mounting base from front to back, and the positioning guide pins are inserted into the housing.

[0014] The positioning guide pins provide a clear direction and positioning reference for the housing installation, enabling the housing to be accurately installed onto the upper mounting base from front to back. The positioning guide pins inserted into the housing ensure the positional accuracy of the housing between the upper and lower templates, reducing installation errors and further improving the precision of press-fitting.

[0015] In some embodiments of this application, the positioning guide pin is installed on the pin seat, the pin seat is fixed below the upper template, and the rotating pressure head assembly includes a rotating cylinder, a clamping arm and a pressure head. One end of the clamping arm is connected to the output shaft of the rotating cylinder, and the other end of the clamping arm is equipped with a pressure head. The rotating cylinder drives the clamping arm to rotate, and the rotated pressure head acts on the housing. The rotated pressure head corresponds one-to-one with the positioning guide pin.

[0016] The design of the rotary pressure head assembly allows the pressure head to rotate via a rotary cylinder, thereby acting on the housing. This rotary pressure head method allows for flexible pressing of the housing, and its one-to-one correspondence with the positioning guide pins ensures uniform clamping force is applied to the housing at different positions, guaranteeing the housing's stability before pressing and improving the stability and reliability of the pressing process.

[0017] In some embodiments of this application, the top surface of the lower mounting base is adapted to the bottom surface of the main spring, a front stop is provided on the lower mounting base, the main spring is mounted on the lower mounting base, and the front stop restricts the main spring to the front side.

[0018] The design of the lower mounting base's top surface conforming to the bottom surface of the main spring provides a good supporting foundation, allowing the main spring to be placed stably on the lower mounting base. The front stop restricts the front position of the main spring, preventing it from shifting forward or backward during pre-compression and pressing, ensuring that the main spring is in the correct position for pre-compression and subsequent pressing operations, thereby improving the accuracy of the entire pressing process.

[0019] In some embodiments of this application, support seats are provided on both the left and right sides of the lower mounting base. The support seats are fixed on the lower template and have a T-shaped block structure. A support block is installed on the top surface of the support seat, and several gaskets are detachably installed between the support block and the support seat.

[0020] By detachably installing several shims between the support block and the support base, the height of the support block is adjustable. The position of the support block can be flexibly adjusted according to the actual pressing requirements, effectively limiting the extreme position of the housing pressure, preventing excessive pressure on the housing, and protecting the equipment and components.

[0021] In some embodiments of this application, a front stop seat is provided on the front side of the slide rail, a front stop block is installed on the rear side of the front stop seat, and a plurality of gaskets are detachably installed between the front stop block and the front stop seat.

[0022] The front stop block and the front stop seat are connected by a removable shim, making the position of the front stop block adjustable. The position of the front stop block can be adjusted by adding or removing shims according to the movement of the slider during the actual pressing process, thereby limiting the slider's forward movement to its extreme position, preventing excessive forward movement of the slider and positioning pin, and ensuring normal operation of the equipment and pressing accuracy.

[0023] In some embodiments of this application, a rear stop seat is provided on the rear side of the slide rail, a rear stop block is installed on the rear side of the rear stop seat, and a plurality of gaskets are detachably installed between the rear stop block and the rear stop seat.

[0024] Similar to the front stop block, the adjustable design of the rear stop block allows for position adjustment by adding or removing shims. This effectively limits the extreme position of the slider's backward movement, preventing excessive backward movement of the slider and positioning pin, thus preventing damage to the equipment due to excessive movement. It ensures the smoothness and accuracy of the pressing process while improving the adaptability and flexibility of the equipment.

[0025] In some embodiments of this application, the slide rail is mounted on the rear side of the lower mounting base, and the slider moves back and forth along the slide rail. The top diameter of the slider is smaller than the middle diameter. This structural design, where the top diameter of the slider is smaller than the middle diameter, provides a certain degree of guidance.

[0026] In some embodiments of this application, oil-free bushings are provided at the four corners of the top surface of the lower template, and guide shafts are provided at the four corners of the bottom surface of the upper template. Each guide shaft corresponds to one of the oil-free bushings, with the bottom of the guide shaft inserted into the oil-free bushing. When the upper template is pressed down, the guide shaft moves axially along the oil-free bushing. This design achieves precise guidance between the upper and lower templates. The oil-free bushings have good wear resistance and self-lubricating properties, ensuring smooth movement of the guide shafts even without oil lubrication. This prevents the upper and lower templates from shifting or jamming due to mutual compression during pressing, improving the stability of equipment operation and also contributing to improved pressing accuracy and quality.

[0027] Based on common knowledge in the field, the above-described embodiments can be combined arbitrarily. Attached Figure Description

[0028] The present application will be described in further detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the present application. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated depictions, and the drawings are not necessarily drawn to scale.

[0029] Figure 1 This is a schematic diagram of the structure of this application;

[0030] Figure 2 This is a schematic diagram of the main spring installed in the lower template according to this application;

[0031] Figure 3 This is a structural diagram of the template under this application;

[0032] Figure 4 This is a schematic diagram of the structure of the shell installed on the upper template in this application;

[0033] Figure 5 This is a structural diagram of the template in this application.

[0034] The specific reference numerals in the attached drawings are explained as follows: 1. Upper template; 2. Lower template; 3. Upper mounting base; 4. Rotary pressure head assembly; 5. Housing; 6. Lower mounting base; 7. Slider; 9. Power cylinder; 10. Positioning pin; 11. Main spring; 12. Limiting block; 13. Front top block; 14. Rear top block; 15. Resting part; 16. Positioning guide pin; 17. Pin seat; 18. Rotary cylinder; 19. Clamping arm; 20. Pressure head; 21. Front stop block; 22. Support seat; 23. Support block; 24. Gasket; 25. Front blocking seat; 26. Front blocking block; 27. Rear blocking seat; 28. Rear blocking block; 29. ​​Oil-free bushing; 30. Guide shaft. Detailed Implementation

[0035] The present application will now be described in detail with reference to the accompanying drawings.

[0036] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0037] Engine shock absorber bracket press-fitting equipment, Example 1 as follows Figure 1As shown: The device includes an upper template 1 and a lower template 2 connected to the press. The bottom surface of the upper template 1 is provided with an upper mounting base 3. Rotary pressing head assemblies 4 are provided on both sides of the upper mounting base 3. The rotating pressing head assemblies 4 work to press the housing 5 firmly onto the upper mounting base 3. The top surface of the lower template 2 is provided with a lower mounting base 6, a slider 7, and a slide rail. The slider 7 is connected to a power cylinder 9 and is movably mounted on the slide rail. A positioning post 10 is installed on the top surface of the slider 7. The main spring 11 is placed on the lower mounting base 6, and the positioning post 10 passes through the main spring 11. The power cylinder 9 drives the positioning post 10 to move and compress the main spring 11. The movement of the positioning post 10 by the power cylinder 9 pre-compresses the main spring 11, preventing excessive compression and wear of the rubber parts in the main spring 11 caused by direct pressing of the housing 5. This effectively prevents changes in the shape and performance degradation of the rubber parts, ensuring the normal operation of the engine shock absorber bracket and extending its service life.

[0038] The press drives the upper template 1 to press down, pressing the housing 5 onto the main spring 11. Pre-pressing the main spring 11 before pressing ensures it is in a suitable state, which helps to more accurately press the housing 5 onto the main spring 11 when the press drives the upper template 1 to press down, reducing inaccurate pressing, improving pressing quality and production efficiency, lowering the defect rate, and saving production costs.

[0039] Each component in this application has a clear division of labor and works closely together. The rotating pressure head assembly 4 is responsible for pressing the housing 5 onto the upper mounting base 3, providing a stable support for subsequent pressing; the components on the lower template 2 work together to pre-press and position the main spring 11, ensuring that the entire pressing process proceeds in an orderly manner.

[0040] For ease of description, this application uses the accompanying drawings as an example. Figure 1 The description is based on the principle of "front side" (the side closer to the manual operation) and "rear side" (the side farther from the manual operation).

[0041] Example 2, as Figure 1 , Figure 4 , Figure 5 As shown, the upper mounting base 3 includes a limiting block 12 and a front top block 13 and a rear top block 14 spaced apart on the bottom surface of the upper template 1. The front top block 13 and the rear top block 14 are positioned against the top surface of the housing 5. The bottom of the limiting block 12 is a support portion 15, located below the rear top block 14, and the support portion 15 has a stepped structure. Through the cooperative design of the limiting block 12, the front top block 13, and the rear top block 14, the housing 5 can be stably pre-fixed. The stepped support portion 15 of the limiting block 12 provides a layered support structure for the rear end of the housing 5, allowing it to be effectively pressed together with the rear top block 14 after being mounted on it. This structural design ensures that the housing 5 will not shift due to force during subsequent pressing, improving the accuracy of pressing.

[0042] The upper mounting base 3 also includes two left and right positioning guide pins 16. The positioning guide pins 16 are located below the upper template 1 and are parallel to the lower template 2. The housing 5 is installed onto the upper mounting base 3 from front to back, and the positioning guide pins 16 are inserted into the housing 5. The positioning guide pins 16 provide a clear direction and positioning reference for the installation of the housing 5, enabling the housing 5 to be accurately installed onto the upper mounting base 3 from front to back. The positioning guide pins 16 inserted into the housing 5 ensure the positional accuracy of the housing 5 between the upper and lower templates 2, reduce installation errors, and further improve the accuracy of press-fitting.

[0043] The positioning guide pin 16 is mounted on the pin seat 17, which is fixed below the upper template 1. The rotary pressure head assembly 4 includes a rotary cylinder 18, a clamping arm 19, and a pressure head 20. One end of the clamping arm 19 is connected to the output shaft of the rotary cylinder 18, and the other end of the clamping arm 19 is equipped with the pressure head 20. The rotary cylinder 18 drives the clamping arm 19 to rotate, and the rotated pressure head 20 acts on the housing 5. The rotated pressure head 20 corresponds one-to-one with the positioning guide pin 16. The design of the rotary pressure head assembly 4 allows the pressure head 20 to rotate under the drive of the rotary cylinder 18, thereby acting on the housing 5. This method of rotating the pressure head 20 allows for flexible pressing operations on the housing 5. The one-to-one correspondence with the positioning guide pin 16 ensures uniform clamping force is applied to the housing 5 at different positions, guaranteeing the stability of the housing 5 before pressing and improving the stability and reliability of the pressing process.

[0044] The rest of the contents of Example 2 are the same as those of Example 1.

[0045] Example 3, as Figures 1 to 3 As shown, the top surface of the lower mounting base 6 is adapted to the bottom surface of the main spring 11. A front stop 21 is provided on the lower mounting base 6. The main spring 11 is mounted on the lower mounting base 6, and the front stop 21 restricts the main spring 11 to its front side. The design of the top surface of the lower mounting base 6 adapting to the bottom surface of the main spring 11 provides a good supporting foundation, allowing the main spring 11 to be placed stably on the lower mounting base 6. The front stop 21 restricts the front position of the main spring 11, preventing the main spring 11 from shifting in the front-to-back direction during pre-compression and pressing, ensuring that the main spring 11 is in the correct position for pre-compression and subsequent pressing operations, thereby improving the accuracy of the entire pressing process.

[0046] Support seats 22 are provided on both the left and right sides of the lower mounting base 6. The support seats 22 are fixed on the lower template 2 and have a T-shaped block structure. A support block 23 is installed on the top surface of the support seat 22. Several gaskets 24 are detachably installed between the support block 23 and the support seat 22. By detachably installing several gaskets 24 between the support block 23 and the support seat 22, the height of the support block 23 is adjustable. The position of the support block 23 can be flexibly adjusted according to the actual pressing requirements, effectively limiting the extreme position of the housing 5 under pressure, preventing excessive pressure on the housing 5, and protecting the equipment and components.

[0047] A front stop seat 25 is provided on the front side of the slide rail, and a front stop block 26 is installed on the rear side of the front stop seat 25. Several shims 24 are detachably installed between the front stop block 26 and the front stop seat 25. The design of the detachable shims 24 between the front stop block 26 and the front stop seat 25 makes the position of the front stop block 26 adjustable. According to the movement of the slider 7 during the actual pressing process, the position of the front stop block 26 can be adjusted by adding or removing shims 24, thereby limiting the extreme position of the slider 7's forward movement, preventing the slider 7 and the positioning post 10 from excessively rushing forward, and ensuring the normal operation of the equipment and the pressing accuracy.

[0048] A rear stop seat 27 is provided on the rear side of the slide rail, and a rear stop block 28 is installed on the rear side of the rear stop seat 27. Several shims 24 are detachably installed between the rear stop block 28 and the rear stop seat 27. Similar to the front stop block 26, the adjustable design of the rear stop block 28 can be adjusted by adding or removing shims 24. This can effectively limit the extreme position of the slider 7's backward movement, prevent the slider 7 and the positioning post 10 from moving backward excessively, prevent the equipment from being damaged due to excessive movement, ensure the stability and accuracy of the pressing process, and improve the adaptability and flexibility of the equipment.

[0049] The slide rail is installed on the rear side of the lower mounting base 6, and the slider 7 moves back and forth along the slide rail. The top diameter of the slider 7 is smaller than the middle diameter. This structural design, where the top diameter of the slider 7 is smaller than the middle diameter, provides a certain degree of guidance.

[0050] Oil-free bushings 29 are provided at the four corners of the top surface of the lower template 2, and guide shafts 30 are provided at the four corners of the bottom surface of the upper template 1. Each guide shaft 30 corresponds to one of the oil-free bushings 29, with the bottom of the guide shaft 30 inserted into the oil-free bushing 29. When the upper template 1 is pressed down, the guide shaft 30 moves axially along the oil-free bushing 29. This design achieves precise guidance between the upper and lower templates 2. The oil-free bushings 29 have good wear resistance and self-lubricating properties, ensuring smooth movement of the guide shafts 30 even without oil lubrication. This prevents the upper and lower templates 2 from shifting or jamming due to mutual compression during pressing, improving the stability of equipment operation and also contributing to improved pressing accuracy and quality.

[0051] The other contents of Example 3 are the same as those of Example 1 or Example 2.

[0052] The present application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present application. The descriptions of the embodiments above are only for the purpose of helping to understand the present application and its core ideas. It should be noted that those skilled in the art can make several improvements and modifications to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. An engine damper bracket press fitting apparatus, characterized by, The device includes an upper template (1) and a lower template (2) connected to a press. The bottom surface of the upper template (1) is provided with an upper mounting seat (3). Rotary pressing head assemblies (4) are provided on both sides of the upper mounting seat (3). The rotating pressing head assembly (4) presses the housing (5) onto the upper mounting seat (3). The top surface of the lower template (2) is provided with a lower mounting seat (6), a slider (7), and a slide rail. The slider (7) is connected to a power cylinder (9). The slider (7) is movably mounted on the slide rail. A positioning column (10) is installed on the top surface of the slider (7). The main spring (11) is placed on the lower mounting seat (6), and the positioning column (10) passes through the main spring (11). The power cylinder (9) drives the positioning column (10) to move and squeeze the main spring (11). The press drives the upper template (1) to press down and press the housing (5) onto the outside of the main spring (11).

2. The engine damper bracket press fitting apparatus according to claim 1, characterized by, The upper mounting base (3) includes a limiting block (12) and a front top block (13) and a rear top block (14) spaced apart on the bottom surface of the upper template (1). The front top block (13) and the rear top block (14) are placed on the top surface of the housing (5). The bottom of the limiting block (12) is a resting part (15), which is located below the rear top block (14). The resting part (15) has a stepped structure.

3. The engine damper bracket press fitting apparatus according to claim 2, characterized by, The upper mounting base (3) also includes two left and right positioning guide pins (16). The positioning guide pins (16) are located below the upper template (1) and are parallel to the lower template (2). The housing (5) is installed on the upper mounting base (3) from front to back, and the positioning guide pins (16) are inserted into the housing (5).

4. The engine shock absorber bracket press-fitting equipment according to claim 3, characterized in that, The positioning guide pin (16) is installed on the pin seat (17), and the pin seat (17) is fixed below the upper template (1). The rotating pressure head assembly (4) includes a rotating cylinder (18), a clamping arm (19) and a pressure head (20). One end of the clamping arm (19) is connected to the output shaft of the rotating cylinder (18), and the other end of the clamping arm (19) is equipped with a pressure head (20). The rotating cylinder (18) drives the clamping arm (19) to rotate. The rotated pressure head (20) acts on the housing (5). The rotated pressure head (20) corresponds one-to-one with the positioning guide pin (16).

5. The engine mount bracket press fitting apparatus according to claim 1, characterized by, The top surface of the lower mounting base (6) is adapted to the bottom surface of the main spring (11). A front stop (21) is provided on the lower mounting base (6). The main spring (11) is mounted on the lower mounting base (6), and the front stop (21) is restricted to the front side of the main spring (11).

6. The engine mount bracket press fitting apparatus according to claim 1, characterized by, The lower mounting base (6) is provided with support bases (22) on both the left and right sides. The support bases (22) are fixed on the lower template (2). The support bases (22) are T-shaped block structures. The top surface of the support bases (22) is equipped with support blocks (23). Several gaskets (24) are detachably installed between the support blocks (23) and the support bases (22).

7. The engine mount bracket press fitting apparatus according to claim 1, characterized by, A front stop seat (25) is provided on the front side of the slide rail, and a front stop block (26) is installed on the rear side of the front stop seat (25). Several gaskets (24) are detachably installed between the front stop block (26) and the front stop seat (25).

8. The engine mount bracket press fitting apparatus according to claim 1, characterized by, A rear stop seat (27) is provided on the rear side of the slide rail, and a rear stop block (28) is installed on the rear side of the rear stop seat (27). Several gaskets (24) are detachably installed between the rear stop block (28) and the rear stop seat (27).

9. The engine shock absorber bracket press-fitting equipment according to claim 1, characterized in that, The slide rail is installed on the rear side of the lower mounting base (6), and the slider (7) moves back and forth along the slide rail. The top diameter of the slider (7) is smaller than the middle diameter.

10. The engine mount bracket press fitting apparatus according to claim 1, characterized by, Oil-free bushings (29) are provided at the four corners of the top surface of the lower template (2), and guide shafts (30) are provided at the four corners of the bottom surface of the upper template (1). The guide shafts (30) correspond one-to-one with the oil-free bushings (29). The bottom of the guide shafts (30) is inserted into the oil-free bushings (29). When the upper template (1) is pressed down, the guide shafts (30) move along the axial direction of the oil-free bushings (29).

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