Expansion mandrel device for cylindrical grinding

Abstract

The utility model belongs to the field of cylindrical grinding and tensioning mandrel devices, and particularly relates to a cylindrical grinding and tensioning mandrel device which comprises a grinding mandrel body, a movable groove is formed in the grinding mandrel body, and a loosening and tensioning positioning shaft is connected into the movable groove in a sliding mode. When a nut workpiece body is clamped, the nut workpiece body is arranged outside the core grinding shaft body in a sleeving mode, then the locking nut is rotated, the loosening and expanding positioning shaft cannot rotate through threaded fit between the locking nut and the loosening and expanding positioning shaft, and the locking nut cannot move horizontally, so that the loosening and expanding positioning shaft can be driven to move horizontally; in this way, the movable steel ball is matched with the inclined face of the loose positioning shaft, the movable steel ball can move in the radial direction, the inner hole of the nut workpiece body is opened, the effect of locking the nut workpiece body is achieved, meanwhile, the clamping and dismantling time is shortened, the concentricity of the inner hole and the outer circle of the nut workpiece body can be accurately guaranteed, and the machining precision of products is controlled. And the clamping efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of external cylindrical grinding tensioning mandrel device, specifically an external cylindrical grinding tensioning mandrel device. Background Technology

[0002] A nut is a fastener that is screwed onto a bolt or threaded rod. It is an essential component in all manufacturing machinery. Depending on the material, nuts are classified into several types, such as carbon steel, stainless steel, and non-ferrous metals. When machining the outer diameter of a nut, a tapered mandrel is usually used.

[0003] However, this process has high requirements for the inner diameter of the nut and the size of the tapered mandrel. Each nut needs to be equipped with a mandrel of a certain specification, which is quite limited due to the large variety of types. Secondly, the contact between the tapered mandrel and the inner diameter of the nut is a single-line contact, which will cause deviation in the concentricity between the inner diameter and the outer diameter of the nut, resulting in low machining accuracy. Furthermore, disassembly is troublesome, requiring hammering to separate the nut from the tapered bar, leading to low clamping efficiency. Therefore, an outer diameter grinding tensioning mandrel device is proposed to address the above problems. Utility Model Content

[0004] To overcome the shortcomings of existing technologies and solve the problems of each nut requiring a specific type of mandrel, which is limited by the large variety of types, and the single-line contact between the tapered mandrel and the inner hole of the nut, which causes deviation in the concentricity between the inner hole and the outer circle of the nut, resulting in low machining accuracy, and making disassembly troublesome, requiring hammering to separate the nut from the tapered bar, and resulting in low clamping efficiency, this utility model proposes an outer circle grinding tensioning mandrel device.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: The external cylindrical grinding tension mandrel device of this utility model includes a grinding mandrel body, a movable groove is opened inside the grinding mandrel body, a loosening positioning shaft is slidably connected inside the movable groove, an inclined groove is opened outside the loosening positioning shaft, a plurality of ball grooves are opened inside the grinding mandrel body, each ball groove is provided with a movable steel ball, the movable steel ball is located inside the inclined groove, one end of the loosening positioning shaft extends to the outside of the grinding mandrel body, a locking nut is rotatably connected to one side of the grinding mandrel body, the locking nut is threadedly connected to the loosening positioning shaft, and a nut workpiece body is sleeved on the outside of the grinding mandrel body.

[0006] Preferably, the minimum number of inclined slots is two.

[0007] Preferably, a spring is provided inside the movable groove, and the spring is sleeved on the outside of the expansion positioning shaft.

[0008] Preferably, a plug cover is provided on one side of the grinding core shaft body, and an anti-loosening pin is provided inside the plug cover. The plug cover is connected to the grinding core shaft body through the anti-loosening pin.

[0009] Preferably, a limiting plate is provided on the outside of the grinding core shaft body, and the nut workpiece body is in contact with the limiting plate.

[0010] The advantages of this utility model are:

[0011] 1. When clamping the nut workpiece body, the nut workpiece body is placed on the outside of the grinding core shaft body. Then, the locking nut is rotated. Through the threaded engagement between the locking nut and the expansion positioning shaft, the expansion positioning shaft cannot rotate, and the locking nut will not move horizontally. This will drive the expansion positioning shaft to move horizontally. The engagement between the moving steel ball and the inclined surface of the expansion positioning shaft will cause the moving steel ball to move radially, opening the inner hole of the nut workpiece body, thus achieving the effect of locking the nut workpiece body. At the same time, it reduces the clamping and disassembly time, can accurately ensure the concentricity of the inner hole and outer circle of the nut workpiece body, control the processing accuracy of the product, and improve the clamping efficiency.

[0012] 2. In this utility model, the steel balls on both sides make contact with the inner hole of the nut workpiece body, forming a double-line contact, which improves the rigidity of the nut workpiece body during machining. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is an enlarged structural diagram of point A in this utility model;

[0016] Figure 3 This is an enlarged structural diagram of part B of the present invention.

[0017] In the diagram: 1. Grinding core shaft body; 2. Expansion positioning shaft; 3. Inclined groove; 4. Ball groove; 5. Moving steel ball; 6. Locking nut; 7. Plug cap; 8. Anti-loosening pin; 9. Nut workpiece body; 10. Movable groove; 11. Spring; 12. Limiting plate. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0019] Please see Figures 1-3 As shown, an external cylindrical grinding expansion mandrel device includes a grinding mandrel body 1, an internal movable groove 10, a sliding connection of an expansion positioning shaft 2 inside the movable groove 10, an external inclined groove 3 outside the expansion positioning shaft 2, a plurality of ball grooves 4 inside the grinding mandrel body 1, each ball groove 4 having a movable steel ball 5 inside, the movable steel ball 5 being located inside the inclined groove 3, one end of the expansion positioning shaft 2 extending to the outside of the grinding mandrel body 1, a locking nut 6 rotatably connected to one side of the grinding mandrel body 1, the locking nut 6 being threadedly connected to the expansion positioning shaft 2, and the locking nut being threadedly connected to the expansion positioning shaft and pushing the expansion positioning shaft 2 axially through its end face, thereby achieving radial expansion of the steel ball 5, and a nut workpiece body 9 sleeved on the outside of the grinding mandrel body 1;

[0020] During operation, when clamping the nut workpiece body 9, the nut workpiece body 9 is placed on the outside of the grinding core shaft body 1. Then, the locking nut 6 is rotated. Through the threaded engagement between the locking nut 6 and the expansion positioning shaft 2, the expansion positioning shaft 2 cannot rotate, and the locking nut 6 will not move horizontally. This will drive the expansion positioning shaft 2 to move horizontally. The engagement between the moving steel ball 5 and the inclined surface of the expansion positioning shaft 2 will cause the moving steel ball 5 to move radially, opening the inner hole of the nut workpiece body 9, achieving the effect of locking the nut workpiece body 9. At the same time, it reduces the clamping and disassembly time, accurately ensures the concentricity of the inner hole and outer circle of the nut workpiece body 9, controls the processing accuracy of the product, and improves the clamping efficiency.

[0021] Furthermore, the minimum number of inclined slots 3 is two;

[0022] During operation, multiple sets of inclined grooves 3 cooperate with the moving steel balls 5, which allows for fixation in multiple positions, making it more concealed.

[0023] Furthermore, a spring 11 is provided inside the movable groove 10, and the spring 11 is sleeved on the outside of the expansion positioning shaft 2;

[0024] During operation, the spring 11 allows the expansion positioning shaft 2 to be popped out directly when it is replaced, making replacement convenient.

[0025] Furthermore, a plug cover 7 is provided on one side of the grinding core shaft body 1, and an anti-loosening pin 8 is provided inside the plug cover 7. The plug cover 7 is connected to the grinding core shaft body 1 through the anti-loosening pin 8.

[0026] During operation, this prevents the expansion positioning shaft 2 from separating from the grinding core shaft body 1 and facilitates the replacement of the expansion positioning shaft 2.

[0027] Furthermore, a limiting plate 12 is provided on the outside of the grinding core shaft body 1, and the nut workpiece body 9 is in contact with the limiting plate 12;

[0028] During operation, the limiting plate 12 is set to connect the nut workpiece body 9 to the grinding core shaft body 1, preventing the nut workpiece body 9 from separating from the grinding core shaft body 1.

[0029] Working principle: When clamping the nut workpiece body 9, the nut workpiece body 9 is placed on the outside of the grinding core shaft body 1. Then, the locking nut 6 is rotated. Through the threaded engagement between the locking nut 6 and the expansion positioning shaft 2, the expansion positioning shaft 2 cannot rotate, and the locking nut 6 will not move horizontally. This will drive the expansion positioning shaft 2 to move horizontally. The engagement between the moving steel ball 5 and the inclined surface of the expansion positioning shaft 2 will cause the moving steel ball 5 to move radially, opening the inner hole of the nut workpiece body 9, achieving the effect of locking the nut workpiece body 9. At the same time, it reduces the clamping and disassembly time, accurately ensures the concentricity of the inner hole and outer circle of the nut workpiece body 9, controls the processing accuracy of the product, and improves the clamping efficiency.

[0030] The steel balls on both sides contact the inner hole of the nut workpiece body 9, forming a double-line contact, which improves the rigidity of the nut workpiece body 9 during machining.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A cylindrical grinding tensioning mandrel device, comprising a grinding mandrel body (1), characterized in that: The grinding core shaft body (1) has an internal movable groove (10), and a loosening positioning shaft (2) is slidably connected inside the movable groove (10). An inclined groove (3) is provided on the outside of the loosening positioning shaft (2). Several ball grooves (4) are provided inside the grinding core shaft body (1). A movable steel ball (5) is provided inside each of the ball grooves (4). The movable steel ball (5) is located inside the inclined groove (3). One end of the loosening positioning shaft (2) extends to the outside of the grinding core shaft body (1). A locking nut (6) is rotatably connected to one side of the grinding core shaft body (1). The locking nut (6) is threadedly connected to the loosening positioning shaft (2). A nut workpiece body (9) is sleeved on the outside of the grinding core shaft body (1).

2. The external cylindrical grinding tensioning mandrel device according to claim 1, characterized in that: The minimum number of inclined grooves (3) is two.

3. The external cylindrical grinding tensioning mandrel device according to claim 1, characterized in that: A spring (11) is provided inside the movable groove (10), and the spring (11) is sleeved on the outside of the expansion positioning shaft (2).

4. The external cylindrical grinding tensioning mandrel device according to claim 1, characterized in that: A plug cover (7) is provided on one side of the grinding core shaft body (1), and an anti-loosening pin (8) is provided inside the plug cover (7). The plug cover (7) is connected to the grinding core shaft body (1) through the anti-loosening pin (8).

5. The external cylindrical grinding tensioning mandrel device according to claim 1, characterized in that: A limiting plate (12) is provided on the outside of the grinding core shaft body (1), and the nut workpiece body (9) is in contact with the limiting plate (12).

Images