Clamp for cutting connecting rod

Abstract

The clamp for cutting the connecting rod comprises a platform, two inner supporting mechanisms used for positioning and fixing shaft holes in the two ends of the connecting rod are arranged on the platform, each inner supporting mechanism comprises an outer cylinder and an inner cylinder rotationally connected with the outer cylinder, and a plurality of hinge rods are arranged on the outer surface of each inner cylinder and penetrate out of the outer cylinder. Through the arrangement of the external threaded rod, when an external stamping device conducts stamping and trimming, the external threaded rod is firstly driven to press downwards, then the inner cylinder rotates, the hinge rods are supported out in an array posture, a shaft hole of the connecting rod can be rapidly positioned, then fixing is formed through certain external supporting pressure, and therefore the connecting rod can be rapidly punched and trimmed. During operation, the large end shaft hole and the small end shaft hole of the connecting rod only need to be arranged on the two inner supporting mechanisms in a sleeving mode respectively, and positioning and clamping are automatically completed at the moment before stamping and trimming.

Description

Technical Field

[0001] The utility model belongs to the field of connecting rod processing, and particularly relates to a fixture for connecting rod cutting. Background Art

[0002] The connecting rod forging process is a key process in manufacturing automotive engine connecting rods and crank connecting rod mechanisms. The process is complex and requires high precision. The connecting rod forging process refers to the process of processing metal billets into connecting rod parts with specific shapes and properties through forging processes. During the forging process, the metal billets are plastically deformed under the action of pressure in the die to obtain the required shapes and dimensions.

[0003] After forging, the connecting rod needs to cut the burrs. The common cutting method is to use the residual temperature of forging for stamping and trimming to reduce the pressure generated during trimming. Therefore, it is necessary to quickly position and fix the connecting rod. However, using a conventional fixture for positioning and fixing the connecting rod is slow and cannot be quickly completed. Or placing a die on the cutting platform can quickly position, but the fixing effect is poor, and the connecting rod may be inclined under force during the cutting process. Content of the Utility Model

[0004] The purpose of the utility model is to provide a fixture for connecting rod cutting that uses the connecting rod shaft hole for quick positioning and fixing to solve the above problems.

[0005] The utility model realizes the above purpose through the following technical solutions:

[0006] A fixture for connecting rod cutting, including a platform. Two inner support mechanisms for positioning and fixing the shaft holes at both ends of the connecting rod are arranged on the platform. The inner support mechanism includes an outer cylinder and an inner cylinder rotatably connected to the outer cylinder. A plurality of hinge rods are arranged on the outer surface of the inner cylinder and penetrate through the outer cylinder. A convex block is arranged at the penetration of the outer cylinder. A chute corresponding to the convex block is arranged on the surface of the hinge rod, so that the rotation of the inner cylinder drives the hinge rod to expand outwards or retract inwards. An external threaded rod for driving the inner cylinder to rotate by sliding is arranged inside the inner cylinder.

[0007] As a further optimized scheme of the utility model, the inner cylinder includes a first inner cylinder and a second inner cylinder. Among them, the first inner cylinder is rotatably connected to the outer cylinder, the second inner cylinder is rotatably connected to the first inner cylinder, and a torsion spring is arranged between the second inner cylinder and the first inner cylinder. A thread groove corresponding to the external threaded rod is arranged inside the second inner cylinder. The threads of the external threaded rod and the thread groove are both wide-pitch threads. In this scheme, by dividing the inner cylinder into a first inner cylinder and a second inner cylinder and arranging a torsion spring between them, when the external threaded rod is pressed down by the stamping device, the torsion force is transmitted to the first inner cylinder through the torsion spring, and the first inner cylinder drives the hinge rod to expand outwards through the torsion force of the torsion spring. This setting has a certain redundancy for the descending amplitude of the external threaded rod and can adapt to connecting rods of different sizes.

[0008] As a further optimization solution of the present utility model, a limiting groove is provided inside the outer threaded rod, and a limiting post corresponding to the limiting groove is arranged at the bottom end inside the outer cylinder. The rotation of the outer threaded rod is restricted by the limiting post. The outer threaded rod only needs to move up and down and cannot rotate. Therefore, the limiting post is provided for restriction.

[0009] As a further optimization solution of the present utility model, a spring is further arranged between the outer threaded rod and the outer cylinder to facilitate the reset and bounce of the outer threaded rod.

[0010] As a further optimization solution of the present utility model, a guide roller is arranged at the end of the articulated rod, and the axial direction of the guide roller is parallel to the axial direction of the outer cylinder. The guide roller can reduce the sliding friction between the articulated rod and the inner wall of the connecting rod shaft hole, which helps to adjust the posture of the connecting rod.

[0011] As a further optimization solution of the present utility model, a sliding groove is further provided on the platform, and the outer cylinder of one of the inner support mechanisms is slidably arranged in the sliding groove. The two inner support mechanisms are respectively used to position and fix the large-end shaft hole and the small-end shaft hole of the connecting rod. Since the distances between the large and small ends of different connecting rods are different, one of the inner support mechanisms is arranged to be slidable. This slidable inner support mechanism does not need to be fixed, and it can automatically find the position during the process of the outer support of the articulated rod.

[0012] The beneficial effects of the present utility model are as follows:

[0013] By providing the outer threaded rod in the present utility model, when the external stamping device performs stamping and trimming, it first drives the outer threaded rod to press down, and then makes the inner cylinder rotate to push out the articulated rod. The articulated rods are pushed out in an array posture, which can quickly position the shaft holes of the connecting rod, and then form a fixation with a certain outer support pressure to achieve the purpose of automatic positioning and clamping. During operation, only the large-end and small-end shaft holes of the connecting rod need to be respectively sleeved on the two inner support mechanisms, and the positioning and clamping are automatically completed immediately before stamping and trimming. Description of the Drawings

[0014] Figure 1 is the overall structural schematic diagram of the present utility model.

[0015] Figure 2 is the top view of the present utility model.

[0016] Figure 3 is the schematic diagram of the inner support mechanism of the present utility model.

[0017] Figure 4 is the Figure 3 enlarged view of the structure of part A in the present utility model.

[0018] Figure 5 is the top view of the connection between the articulated rod and the outer cylinder of the present utility model.

[0019] In the figure: 1. Platform; 2. Inner support mechanism; 21. Outer cylinder; 22. First inner cylinder; 23. Second inner cylinder; 24. Torsion spring; 25. Outer threaded rod; 26. Limit post; 27. Spring; 28. Hinge rod; 29. Guide roller; 210. Chute; 211. Convex block; 3. Sliding groove. Specific embodiments

[0020] The present application will be further described in detail below with reference to the accompanying drawings. It is necessary to point out here that the following specific embodiments are only used to further illustrate the present application and cannot be understood as limiting the protection scope of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application according to the above application content.

[0021] Embodiment 1

[0022] As Figures 1-5 shown, a fixture for cutting connecting rods includes a platform 1. Two inner support mechanisms 2 for positioning and fixing the shaft holes at both ends of the connecting rod are arranged on the platform 1. The inner support mechanism 2 includes an outer cylinder 21 and an inner cylinder rotatably connected to the outer cylinder 21. A plurality of hinge rods 28 are arranged on the outer surface of the inner cylinder and penetrate through the outer cylinder 21. A convex block 211 is arranged at the penetration of the outer cylinder 21. A through groove is arranged at this penetration, and the width of the through groove is greater than the width of the hinge rod 28 to facilitate the hinge rod to change its angle. A chute 210 corresponding to the convex block 211 is opened on the surface of the hinge rod 28. The convex block 211 is cylindrical. When the hinge rod 28 is pushed outwards or retracted inwards, the convex block 211 acts as a shaft to enable the inner cylinder to rotate and drive the hinge rod 28 to be pushed outwards or retracted inwards. An outer threaded rod 25 for driving the inner cylinder to rotate by sliding is arranged inside the inner cylinder.

[0023] In this solution, by arranging the outer threaded rod 25, when the external stamping device performs stamping and trimming, it first drives the outer threaded rod 25 to press down, and then the inner cylinder rotates to push out the hinge rod 28. The hinge rods 28 are pushed out in an array posture, which can quickly position the shaft holes of the connecting rod, and then form a fixation with a certain outward support pressure to achieve the purpose of automatic positioning and clamping. During operation, only the large and small end shaft holes of the connecting rod need to be sleeved on the two inner support mechanisms 2 respectively, and the positioning and clamping are automatically completed immediately before the subsequent stamping and trimming.

[0024] The inner cylinder includes a first inner cylinder 22 and a second inner cylinder 23. Among them, the first inner cylinder 22 is rotatably connected to the outer cylinder 21, the second inner cylinder 23 is rotatably connected to the first inner cylinder 22, and a torsion spring 24 is arranged between the second inner cylinder 23 and the first inner cylinder 22. A thread groove corresponding to the external threaded rod 25 is arranged in the second inner cylinder 23. The threads of the external threaded rod 25 and the thread groove are both wide-pitch threads. In this solution, by dividing the inner cylinder into the first inner cylinder 22 and the second inner cylinder 23 and arranging the torsion spring 24 between the two, when the external threaded rod 25 is pressed down by the stamping device, the torsion force is transmitted to the first inner cylinder 22 through the torsion spring 24, and the first inner cylinder 22 drives the hinge rod 28 to stretch outwards through the torsion force of the torsion spring 24. This setting has a certain redundancy for the descending range of the external threaded rod 25 and can adapt to connecting rods with different apertures.

[0025] A limiting groove is opened in the external threaded rod 25, and a limiting post 26 corresponding to the limiting groove is arranged at the bottom end inside the outer cylinder 21. The rotation of the external threaded rod 25 is restricted by the limiting post 26. The external threaded rod 25 only needs to move up and down and cannot rotate. Therefore, the limiting post 26 is arranged for restriction. Further, a spring 27 is also arranged between the external threaded rod 25 and the outer cylinder 21 to facilitate the reset and bounce of the external threaded rod 25.

[0026] A guide roller 29 is arranged at the end of the hinge rod 28. The axial direction of the guide roller 29 is parallel to the axial direction of the outer cylinder 21. The guide roller 29 can reduce the sliding friction between the hinge rod 28 and the inner wall of the connecting rod shaft hole and helps to adjust the posture of the connecting rod.

[0027] A sliding groove 3 is also opened on the platform 1. The outer cylinder 21 of one of the inner support mechanisms 2 is slidably arranged in the sliding groove 3. The two inner support mechanisms 2 are respectively used to position and fix the large-end shaft hole and the small-end shaft hole of the connecting rod. Since the distances between the large and small ends of different connecting rods are different, one of the inner support mechanisms 2 is arranged to be slidable. This slidable inner support mechanism 2 does not need to be fixed, and it can automatically find the position during the outward stretching process of the hinge rod 28.

[0028] The specific implementation method is as follows: The large and small ends of the connecting rod are respectively sleeved on the two inner support mechanisms 2, and then stamping and trimming can be carried out (the cutting tool for stamping and trimming has a cutting tool adapted to the outer contour of the connecting rod). The stamping and trimming device first contacts the external threaded rod 25, causing the external threaded rod 25 to be pressed down, driving the second inner cylinder 23 to rotate. The second inner cylinder 23 drives the first inner cylinder 22 to rotate through the torsion spring 24, and the hinge rod 28 is stretched outwards to position and fix the shaft hole of the connecting rod. After the stamping and trimming are completed, the external threaded rod 25 is bounced back to its original position and drives the second inner cylinder 23 and the first inner cylinder 22 to return to their original positions.

[0029] The above-described embodiments merely represent several implementation manners of the present utility model. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several variations and improvements can still be made, and these all belong to the protection scope of the present utility model.

Claims

1. A fixture for connecting rod cutting, characterized in that: It includes a platform (1), on which two inner support mechanisms (2) for positioning and fixing the shaft holes at both ends of the connecting rod are provided. The inner support mechanism (2) includes an outer cylinder (21) and an inner cylinder rotatably connected to the outer cylinder (21). A plurality of hinge rods (28) are arranged on the outer surface of the inner cylinder and penetrate through the outer cylinder (21). A convex block (211) is provided at the penetration of the outer cylinder (21). A sliding groove (210) corresponding to the convex block (211) is formed on the surface of the hinge rod (28), so that the rotation of the inner cylinder drives the hinge rod (28) to expand outwards or retract inwards. An external threaded rod (25) is arranged inside the inner cylinder to drive the inner cylinder to rotate by sliding.

2. A fixture for connecting rod cutting according to claim 1, characterized in that: The inner cylinder includes a first inner cylinder (22) and a second inner cylinder (23). Among them, the first inner cylinder (22) is rotatably connected to the outer cylinder (21), the second inner cylinder (23) is rotatably connected to the first inner cylinder (22), and a torsion spring (24) is arranged between the second inner cylinder (23) and the first inner cylinder (22). A thread groove corresponding to the external threaded rod (25) is arranged inside the second inner cylinder (23). The threads of the external threaded rod (25) and the thread groove are both wide-pitch threads.

3. A fixture for connecting rod cutting according to claim 2, characterized in that: A limiting groove is formed inside the external threaded rod (25), and a limiting column (26) corresponding to the limiting groove is arranged at the bottom end inside the outer cylinder (21). The rotation of the external threaded rod (25) is restricted by the limiting column (26).

4. A fixture for connecting rod cutting according to claim 3, characterized in that: A spring (27) is further arranged between the external threaded rod (25) and the outer cylinder (21).

5. A fixture for connecting rod cutting according to claim 1, characterized in that: A guide roller (29) is arranged at the end of the hinge rod (28), and the axial direction of the guide roller (29) is parallel to the axial direction of the outer cylinder (21).

6. The fixture for connecting rod cutting according to claim 1, characterized in that: A sliding groove (3) is further formed on the platform (1), and the outer cylinder (21) of one of the inner support mechanisms (2) is slidably arranged in the sliding groove (3).

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