Central shaft press fitting jig

Abstract

The utility model discloses a center shaft press fitting jig which comprises an upper die plate, a press fitting module, a lower die plate and a lower die. The press-fitting module comprises an upper die, a movable limiting barrel, an upper die frame, a spring and a spring pressing plate, the upper die and the upper die frame are installed on the lower end face of the upper die plate, the upper die is sleeved with the movable limiting barrel, the movable limiting barrel is sleeved with the upper die frame, the spring pressing plate is installed on the movable limiting barrel, the movable limiting barrel is sleeved with the spring, and the first end of the spring abuts against the bottom face of the upper die frame. The second end of the spring abuts against the spring pressing plate, a movable cavity is formed among the upper die frame, the upper die plate and the upper die, and the movable limiting barrel is suitable for moving in the movable cavity. The machine adjusting operation can be simplified, the machining precision is improved, clamping and positioning are rapid, the repeated clamping stability is high, the productivity can be improved, the reject ratio is reduced, and therefore the production cost is reduced; meanwhile, operation is easy and convenient, and the center shaft can be conveniently pressed into a workpiece through a hydraulic machine.

Description

Technical Field

[0001] The utility model relates to the technical field of press-fitting jigs, and particularly relates to a central shaft press-fitting jig. Background Art

[0002] At present, for the central shaft press-fitting jig of a hydraulic press, many defects are likely to occur after the central shaft is press-fitted. The main problems are as follows: First, the upper crossbeam and the workbench of the hydraulic press apply force to the central shaft simultaneously, which easily causes the central shaft to bend and deform; Second, when clamping the central shaft, the effective clamping length of the central shaft is too short, and the central shaft is easily pressed off during the press-fitting process, resulting in the non-perpendicularity of the central shaft and the press-fitted workpiece; Third, the clamping and positioning accuracy is poor, and the phenomenon of pressing off is likely to occur during the processing, affecting the processing accuracy, resulting in a low qualified rate of the processed products, thereby increasing the production cost. Content of the Utility Model

[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. For this purpose, the utility model provides a central shaft press-fitting jig, which is convenient for press-fitting the central shaft into the workpiece by using a hydraulic press, can simplify the machine adjustment operation, quickly clamp and position, improve the processing accuracy and efficiency, and reduce the defective rate and production cost.

[0004] An embodiment of the utility model provides a central shaft press-fitting jig, which includes an upper template, a press-fitting module, a lower template and a lower die, and is applicable to press-fitting the central shaft into the workpiece by using a hydraulic press. The press-fitting module includes an upper die, a movable limiting cylinder, an upper die frame, a spring and a spring pressing plate. The upper die and the upper die frame are installed on the lower end surface of the upper template. The movable limiting cylinder is sleeved on the upper die. The upper die frame is sleeved on the movable limiting cylinder. The spring pressing plate is installed on the movable limiting cylinder. The spring is sleeved on the movable limiting cylinder. The first end of the spring abuts against the bottom surface of the upper die frame, and the second end of the spring abuts against the spring pressing plate. An activity chamber is formed between the upper die frame, the upper template and the upper die, and the movable limiting cylinder is adapted to move in the activity chamber.

[0005] According to some embodiments of the utility model, the movable limiting cylinder is provided with a through hole and a limiting hole, the limiting hole is communicated with the through hole, and the upper die is provided with an upper die boss, and the upper die boss penetrates through the through hole.

[0006] According to some embodiments of the utility model, the axis of the limiting hole is aligned with the axis of the workpiece hole.

[0007] According to some embodiments of the utility model, a magnet is arranged on the side wall of the limiting hole for attracting the central shaft.

[0008] According to some embodiments of the present utility model, the inner diameter of the through hole is in clearance fit with the outer diameter of the upper die, so that the movable limiting cylinder is sleeved on the upper die.

[0009] According to some embodiments of the present utility model, exhaust holes are provided on the side wall of the through hole, so that the cavity between the movable limiting cylinder and the upper die can be changed.

[0010] According to some embodiments of the present utility model, the outer diameter of the central shaft is in clearance fit with the inner diameter of the limiting hole, and the outer diameter of the central shaft is in interference fit with the inner hole of the workpiece.

[0011] According to some embodiments of the present utility model, the workpiece hole is a stepped hole, and the outer diameter of the workpiece is in clearance fit with the workpiece hole.

[0012] According to some embodiments of the present utility model, the upper template is provided with a plurality of U-shaped grooves, and the upper template is fixed on the upper cross beam of the hydraulic press through the U-shaped grooves.

[0013] According to some embodiments of the present utility model, the upper template is provided with a plurality of counterbore holes, the upper die is provided with screw holes, and the upper die is fixed on the upper template through the screw holes and the counterbore holes.

[0014] The embodiments of the present utility model at least have the following beneficial effects:

[0015] The above-mentioned central shaft press-fitting fixture includes an upper template, a press-fitting module, a lower template and a lower die. The press-fitting module includes an upper die, a movable limiting cylinder, an upper die holder, a spring and a spring pressing plate. The lower die is provided with a workpiece hole. After the movable limiting cylinder is positioned in cooperation with the lower die, the movable limiting cylinder is aligned with the central axis of the lower die, ensuring that the press-fitting reference of the central shaft and the workpiece is unified. Before the hydraulic press performs press-fitting, the movable limiting cylinder is expanded under the action of the spring, forming a longer inner hole to ensure sufficient clamping length. After the central shaft is inserted into the movable limiting cylinder, the perpendicularity of the central shaft to the workbench can be ensured to prevent pressing deviation. During press-fitting, the central shaft only contacts the inner hole of the workpiece, and the part of the central shaft passing through the workpiece is cleared by the workpiece hole and has no vertical contact with the lower die. In the vertical direction, it only receives the pressure of the upper die, so as to ensure that the central shaft will not be bent by the force at both ends simultaneously. It can simplify the machine adjustment operation, improve the processing accuracy, quickly clamp and position, and has high repeat clamping stability. It can improve the production efficiency, reduce the defective rate, and thus reduce the production cost. At the same time, the operation is simple and convenient, facilitating the press-fitting between the central shaft and the workpiece by using the hydraulic press.

[0016] The additional aspects and advantages of the present utility model will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present utility model. Brief Description of the Drawings

[0017] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the following description of embodiments in conjunction with the accompanying drawings, where:

[0018] Figure 1 is a schematic structural view of the central axis press-fitting fixture according to an embodiment of the present utility model;

[0019] Figure 2 is Figure 1 a schematic structural view of the upper template of the central axis press-fitting fixture shown;

[0020] Figure 3 is Figure 1 a schematic structural view of the upper die of the central axis press-fitting fixture shown;

[0021] Figure 4 is Figure 1 a schematic structural view of the movable limit cylinder of the central axis press-fitting fixture shown;

[0022] Figure 5 is Figure 1 a schematic structural view of the upper die holder of the central axis press-fitting fixture shown;

[0023] Figure 6 is Figure 1 a schematic structural view of the lower die of the central axis press-fitting fixture shown;

[0024] Figure 7 is Figure 1 a schematic structural view when the central axis press-fitting fixture presses the central axis.

[0025] Reference Numerals:

[0026] Upper template 100, U-shaped groove 110, counterbore hole 120, press-fitting module 200, movable chamber 201, upper die 210, upper die boss 211, screw hole 212, movable limit cylinder 220, through hole 221, limit hole 222, magnet 223, exhaust hole 224, upper die holder 230, spring 240, spring pressing plate 250, lower template 300, lower die 400, workpiece hole 410, workpiece 500, central axis 510. Detailed Embodiments

[0027] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0028] In the description of the present utility model, it should be understood that regarding the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc., is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0029] In the description of the present utility model, the meaning of "several" is one or more, the meaning of "multiple" is more than two. Understanding such as greater than, less than, exceeding, etc. does not include the original number, and understanding such as "above", "below", "within", etc. includes the original number. If there is a description of "first", "second", etc., it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or the sequence relationship of the indicated technical features.

[0030] In the description of the present utility model, unless otherwise clearly defined, words such as "set", "installed", "connected", "linked" should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the above words in the present utility model in combination with the specific content of the technical solution.

[0031] Please refer to Figures 1 to 3, this embodiment discloses a central axis press-fitting fixture, which includes an upper template 100, a press-fitting module 200, a lower template 300 and a lower die 400, and is applicable to press-fitting a central axis 510 into a workpiece 500 by a hydraulic press. The upper template 100 is installed on the upper crossbeam of the hydraulic press; the press-fitting module 200 includes an upper die 210, a movable limiting cylinder 220, an upper die holder 230, a spring 240 and a spring pressing plate 250. The upper die 210 and the upper die holder 230 are installed on the lower end surface of the upper template 100. The movable limiting cylinder 220 is sleeved on the upper die 210, the upper die holder 230 is sleeved on the movable limiting cylinder 220, the spring pressing plate 250 is installed on the movable limiting cylinder 220, the spring 240 is sleeved on the movable limiting cylinder 220. The first end of the spring 240 abuts against the bottom surface of the upper die holder 230, and the second end of the spring 240 abuts against the spring pressing plate 250. An activity chamber 201 is formed between the upper die holder 230, the upper template 100 and the upper die 210, and the movable limiting cylinder 220 is adapted to move in the activity chamber 201; the lower template 300 is fixed on the workbench of the hydraulic press; the lower die 400 is provided with a workpiece hole 410, and the lower die 400 is installed on the lower template 300. After the movable limiting cylinder 220 is positioned in cooperation with the workpiece hole 410 of the lower die 400, the movable limiting cylinder 220 is aligned with the central axis of the lower die 400, ensuring the unity of the press-fitting reference for the central axis 510 and the workpiece 500. Before the press-fitting by the hydraulic press, the movable limiting cylinder 220 is stressed by the spring to expand, forming a longer inner hole to ensure sufficient clamping length; after the central axis 510 is inserted into the movable limiting cylinder 220, the perpendicularity of the central axis 510 to the workbench can be ensured to prevent deviation during pressing. When press-fitting the workpiece 500, the central axis 510 only contacts the inner hole of the workpiece 500, and the part of the central axis 510 passing through the workpiece 500 is cleared by the workpiece hole 410 and does not contact the lower die 400 in the vertical direction. In the vertical direction, it only receives the pressure from the upper die 210, thus ensuring that the central axis 510 will not be bent due to the force on both the upper and lower ends simultaneously. It can simplify the machine adjustment operation, quickly clamp and position, have high repeat clamping stability, improve the processing accuracy and efficiency, and reduce the rejection rate and production cost.

[0032] Please refer to Figure 1 , the movable limiting cylinder 220 is provided with a through hole 221 and a limiting hole 222, the limiting hole 222 is communicated with the through hole 221, the upper die 210 is provided with an upper die boss 211, and the upper die boss 211 passes through the through hole 221. Before the press-fitting by the hydraulic press, the movable limiting cylinder 220 is stressed by the spring 240 to expand, forming a longer inner hole with the end face of the upper die boss 211; after the central axis 510 is inserted into the limiting hole 222, the perpendicularity of the central axis 510 to the workbench can be ensured to prevent deviation during pressing.

[0033] Please refer to Figure 1 and Figure 3, the axis of the limiting hole 222 is aligned with the axis of the workpiece hole 410. After the limiting hole 222 of the movable limiting cylinder 220 is positioned in cooperation with the workpiece hole 410 of the lower die 400, the movable limiting cylinder 220 is aligned with the axis of the lower die 400, ensuring that the press-fitting reference of the central axis 510 and the workpiece 500 is unified.

[0034] Please refer to Figure 3 , a magnet 223 is provided on the side wall of the limiting hole 222 for attracting the central axis 510. When the central axis 510 is inserted into the limiting hole 222 of the movable limiting cylinder 220, the magnet 223 attracts the central axis 510 and prevents it from falling.

[0035] Please refer to Figure 2 and Figure 3 , the inner diameter of the through hole 221 has a clearance fit with the outer diameter of the upper die 210, so that the movable limiting cylinder 220 is sleeved on the upper die 210.

[0036] Please refer to Figure 1 and Figure 3 , exhaust holes 224 are provided on the side wall of the through hole 221, so that the cavity between the movable limiting cylinder 220 and the upper die 210 can be variable. Exhaust holes 224 are provided on the side of the movable limiting cylinder 220 to ensure that the cavity between the through hole 221 and the upper die 210 can change freely.

[0037] Please refer to Figure 1 and Figure 5 , the outer diameter of the central axis 510 has a clearance fit with the inner diameter of the limiting hole 222, and the outer diameter of the central axis 510 has an interference fit with the inner hole of the workpiece 500. Before the press-fitting of the movable limiting cylinder 220 by the hydraulic press, it is expanded by the force of the spring 240 and forms a longer inner hole with the end face of the upper die boss 211; after the central axis 510 is inserted into the limiting hole 222, the perpendicularity of the central axis 510 to the workbench can be ensured to prevent pressing deviation.

[0038] Please refer to Figure 5 , the workpiece hole 410 is a stepped hole, and the outer diameter of the workpiece 500 has a clearance fit with the workpiece hole 410. When press-fitting the workpiece 500, the central axis 510 only contacts the inner hole of the workpiece 500, and the part of the central axis 510 passing through the workpiece 500 is cleared by the workpiece hole 410 and has no contact with the lower die 400 in the vertical direction. Only the pressure of the upper die 210 is received in the vertical direction, so as to ensure that the central axis 510 will not be bent by the force at both ends at the same time.

[0039] Please refer to Figure 2 , the upper template 100 is provided with a plurality of U-shaped grooves 110, and the upper template 100 is fixed on the upper cross beam of the hydraulic press through the U-shaped grooves 110.

[0040] Please refer to Figure 1 and Figure 3, the upper template 100 is provided with a plurality of counterbore holes 120, the upper die 210 is provided with screw holes 212, and the upper die 210 is fixed on the upper template 100 through the screw holes 212 and the counterbore holes 120. The lower die 400 is installed on the lower template 300, and the lower template 300 is fixed on the workbench of the hydraulic press.

[0041] Before loading, raise the upper crossbeam of the hydraulic press so that there is enough space between the movable limiting cylinder 220 and the lower die 400 to load the central shaft 510 and the workpiece 500. Insert the central shaft 510 into the limiting hole 222 of the movable limiting cylinder 220, and the magnet 223 attracts the central shaft 510 so that it will not fall; place the workpiece 500 into the workpiece hole 410 of the lower die 400.

[0042] After loading, lower the upper crossbeam of the hydraulic press. The central shaft 510 is pressed by the upper die 210 and enters the workpiece 500. When the movable limiting cylinder 220 contacts the end face of the workpiece 500, the upper die holder 230 and the spring pressing plate 250 compress the spring synchronously, and the movable limiting cylinder 220 moves upward in the movable chamber 201. When the inner end face of the through hole 221 of the movable limiting cylinder 220 abuts against the stepped end face of the upper die 210, the upper crossbeam stops pressing down. There is an inner hole with a certain length formed between the upper die boss 211 and the limiting hole 222, which effectively controls the assembly length of the central shaft 510. At the same time, the head of the central shaft 510 enters the workpiece hole 410 for clearance and does not contact the bottom.

[0043] After the limiting hole 222 of the movable limiting cylinder 220 is aligned with the workpiece hole 410 of the lower die 400 for positioning, the movable limiting cylinder 220 is aligned with the central axis of the lower die 400, ensuring that the pressing and fitting reference of the central shaft 510 and the workpiece 500 is unified. Before the hydraulic press presses and fits, the movable limiting cylinder 220 is expanded by the force of the spring 240 and forms a relatively long inner hole with the end face of the upper die boss 211 to ensure that the clamping length is sufficient; after the central shaft 510 is inserted into the limiting hole 222, the perpendicularity of the central shaft 510 to the workbench can be ensured to prevent pressing deviation. The side of the movable limiting cylinder 220 is provided with exhaust holes 224 to ensure that the cavity between the through hole 221 and the upper die 210 can change freely. When pressing and fitting the workpiece 500, the central shaft 510 only contacts the inner hole of the workpiece 500, and the part of the central shaft 510 passing through the workpiece 500 is cleared by the workpiece hole 410 and does not contact the lower die 400 in the vertical direction. In the vertical direction, it only receives the pressure of the upper die 210, thus ensuring that the central shaft 510 will not be bent by the force at both ends at the same time. It can simplify the machine adjustment operation, improve the processing accuracy, quickly clamp and position, have high repeat clamping stability, can improve the production efficiency and reduce the defective rate, thereby reducing the production cost; at the same time, the operation is simple and convenient to facilitate the pressing and fitting between the central shaft 510 and the workpiece 500 using the hydraulic press.

[0044] The embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings. However, the present utility model is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present utility model within the scope of knowledge possessed by those of ordinary skill in the relevant art.

Claims

1. A center shaft press-fitting jig, suitable for a hydraulic press to press-fit a center shaft (510) into a workpiece (500), characterized in that: include: upper template (100); The press-fitting die set (200) comprises an upper die (210), a movable limiting cylinder (220), an upper die frame (230), a spring (240) and a spring pressure plate (250), wherein the upper die (210) and the upper die frame (230) are mounted on the lower end surface of the upper die plate (100), the movable limiting cylinder (220) is sleeved on the upper die (210), the upper die frame (230) is sleeved on the movable limiting cylinder (220), and the spring pressure plate (250) is mounted on the upper die The spring (240) is sleeved on the movable limiting cylinder (220), the first end of the spring (240) abuts against the bottom surface of the upper mold frame (230), and the second end of the spring (240) abuts against the spring pressure plate (250). An active chamber (201) is formed between the upper mold frame (230), the upper mold plate (100) and the upper mold (210), and the movable limiting cylinder (220) is suitable for moving in the active chamber (201); Lower template (300); A lower die (400) is provided with a workpiece hole (410), and the lower die (400) is mounted on the lower mold plate (300).

2. The center axis press-fitting fixture according to claim 1, characterized in that: The movable limiting cylinder (220) is provided with a through hole (221) and a limiting hole (222), the limiting hole (222) is connected to the through hole (221), and the upper die (210) is provided with an upper die boss (211), and the upper die boss (211) is penetrated through the through hole (221).

3. The center axis press-fitting fixture according to claim 2, characterized in that: The limiting hole (222) is aligned with the central axis of the workpiece hole (410).

4. The center shaft press-fitting jig according to claim 2 or 3, characterized in that: A magnet (223) is provided on the side wall of the limiting hole (222) for attracting the central axis (510).

5. The center axis press-fitting fixture according to claim 2, characterized in that: The inner diameter of the through hole (221) is clearance-matched with the outer diameter of the upper die (210), so that the movable limiting cylinder (220) is sleeved on the upper die (210).

6. The center shaft press-fitting jig according to claim 2, characterized in that: The side wall of the through hole (221) is provided with an exhaust hole (224) so ​​that the cavity between the movable limiting cylinder (220) and the upper mold (210) can be changed.

7. The center shaft press-fitting jig according to claim 2, characterized in that: The outer diameter of the central shaft (510) is clearance-matched with the inner diameter of the limiting hole (222), and the outer diameter of the central shaft (510) is interference-matched with the inner hole of the workpiece (500).

8. The center shaft press-fitting jig according to claim 1, characterized in that: The workpiece hole (410) is a stepped hole, and the workpiece (500) is clearance-matched with the workpiece hole (410).

9. The center shaft press-fitting jig according to claim 1, characterized in that: The upper template (100) is provided with a plurality of U-shaped grooves (110), and the upper template (100) is fixed to an upper crossbeam of a hydraulic press via the U-shaped grooves (110).

10. The center shaft press-fitting jig according to claim 1, characterized in that: The upper mold plate (100) is provided with a plurality of countersunk holes (120), the upper mold (210) is provided with a plurality of screw holes (212), and the upper mold (210) is fixed to the upper mold plate (100) via the screw holes (212) and the countersunk holes (120).

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