An axial rapid positioning device and method for a precision grinding machine

Abstract

The present application discloses an axial rapid positioning device and method for a precision grinding machine, which relates to the field of machining and includes an axial positioning rod passing through a locking joint and a tapered surface locking device for connecting the grinding machine, and the locking joint is connected to the tapered surface locking device; the locking joint is connected with a positioning member, and after the positioning member moves towards the axial positioning rod and abuts against the axial positioning rod, the axial positioning rod and the locking joint are fixed; a connecting rod is detachably connected to one end of the axial positioning rod. It can adjust the axial position of the workpiece to be machined more quickly, meet the positioning requirements of fine workpieces at the same time, and reduce production costs.

Description

Technical Field

[0001] The present invention relates to the field of machining, and specifically to an axial rapid positioning device and method for a precision grinding machine. Background Art

[0002] A collet chuck is a basic auxiliary part with a high usage frequency in precision grinding machine equipment, and its main function is to clamp and position the workpiece to be machined during the machining process. Currently, the commonly used positioning methods are as follows: (1) using a part of the workpiece itself as the positioning reference, such as a stepped shaft, thread, etc.; (2) using a rear-end positioning method: this method uses a long rod that enters the main shaft from the rear end of the main shaft. According to the requirements of the length of the workpiece to be machined, the length of the long rod entering the collet chuck is adjusted by a nut, and finally tightened by a reverse nut; (3) for high-precision workpieces, a boring tool and boring can also be used for positioning.

[0003] In the actual machining process, the existing axial positioning of the collet chuck relies on thread adjustment, with a slow adjustment speed and it is difficult to meet the positioning requirements of some fine and short workpieces. Moreover, the collet chuck needs to be selected corresponding to the size of the workpiece to be machined one by one, and the versatility is poor.

[0004] Considering that the single collet chuck positioning method is cumbersome to operate, the machining speed is low, the product machining cycle is long, and it is difficult to achieve the dimensional machining consistency of some products with strict requirements. For parts that ensure the stability of subsequent machining and the reliability of the final product performance, the traditional positioning method is difficult to meet the product machining requirements. In order to more quickly adjust the axial position of the workpiece to be machined, while ensuring the positioning requirements of fine workpieces and reducing production costs, a rapid axial positioning device for a precision grinding machine has been developed.

[0005] This device is simple and convenient to operate, has strong versatility, and can adapt to different workpiece sizes by simply replacing the workpiece components or connecting rods of different specifications. This device can also be used in other machine tools equipped with collet chucks. Summary of the Invention

[0006] The technical problem solved by the present invention is: overcoming the deficiencies of the prior art, providing an axial rapid positioning device for a precision grinding machine, which can quickly adjust the axial position of the workpiece to be machined, while ensuring the positioning requirements of fine workpieces and reducing production costs.

[0007] The technical solution of the present invention is:

[0008] An axial rapid positioning device for a precision grinding machine, comprising:

[0009] An axial positioning rod passing through a connecting device;

[0010] A connecting device connected with a positioning member, and after the positioning member moves towards the axial positioning rod and abuts against the axial positioning rod, the axial positioning rod and the connecting device are fixed;

[0011] The connecting rod is detachably connected to one end of the axial positioning rod.

[0012] The connecting device includes a locking joint and a conical locking device. The locking joint is inserted into the conical locking device and is connected to the conical locking device. The conical locking device is provided with balls floating along the radial direction of the conical locking device. One end of the locking joint inserted into the conical locking device is provided with a mating conical surface for pushing the balls to move in a direction away from the axis of the conical locking device;

[0013] Along the insertion direction of the locking joint, the outer diameter of the mating conical surface gradually decreases.

[0014] The positioning member is a locking screw, and the locking screw is threadedly connected to the locking joint.

[0015] The locking joint is threadedly connected to the conical locking device.

[0016] One end of the conical locking device is provided with an outer conical surface, and the maximum outer diameter of the outer conical surface is not less than the inner diameter of the inner hole of the grinding machine spring collet.

[0017] The included angle between the mating conical surface and the inner wall of the locking joint is 13 - 17°.

[0018] The balls are close to the end of the conical locking device away from the outer conical surface.

[0019] At least three balls are provided.

[0020] The connecting rod is threadedly connected to the axial positioning rod.

[0021] The connecting rod includes a screw rod, a connecting portion, and a limiting portion connected in sequence. The screw rod is used for threaded connection with the axial positioning rod. One side of the connecting portion facing the limiting portion is a positioning surface for abutting against the workpiece to be processed, and the limiting portion is used for inserting into the positioning hole of the workpiece to be processed.

[0022] A positioning method for an axial rapid positioning device of a precision grinding machine includes:

[0023] Insert the conical locking device into the inner hole of the spring collet of the grinding machine, so that the outer conical surface abuts against one end of the inner hole of the spring collet circumferentially. Thread the locking joint into the conical locking device until the balls are clamped against the inner wall of the inner hole of the spring collet;

[0024] Pass the axial positioning rod through the locking joint and the conical locking device, and rotate the locking screw to fix the axial positioning rod;

[0025] Thread the connecting rod to the end of the axial positioning rod.

[0026] In summary, the present application includes at least the following beneficial technical effects:

[0027] 1) It can accurately position and clamp the workpiece (or tool), and has the functions of resisting torque and bearing cutting forces from multiple directions.

[0028] 2) It has the functions of increasing the driving force (tensile force) and converting the driving force into the clamping force of the workpiece (or tool).

[0029] 3) It has the function of quickly releasing the workpiece (or tool).

[0030] 4) It has high repeatability accuracy without reducing the machining accuracy and damaging the workpiece.

[0031] 5) It has the ability to work within a wide range of spindle speeds while only generating a minimal clamping force loss.

[0032] 6) It has the minimum moment of inertia during high-speed cutting. Description of the Drawings

[0033] Figure 1 It is a schematic diagram of the overall structure of the positioning device in the embodiment of the present application;

[0034] Figure 2 It is a cross-sectional view of the cooperation between the positioning device and the collet chuck in the embodiment of the present application;

[0035] Figure 3 It is a schematic diagram of the structure of the locking joint in the embodiment of the present application;

[0036] Figure 4 It is a schematic diagram of the structure of the conical surface locking device in the embodiment of the present application;

[0037] Figure 5 In [diagram], a and b are respectively schematic diagrams of the axial positioning rod and connecting rods of various dimensions in the embodiment of the present application.

[0038] Description of the Reference Numerals: 1, locking screw; 2, locking joint; 21, mating conical surface; 3, conical surface locking device; 31, ball; 32, outer conical surface; 4, axial positioning rod; 5, connecting rod; 51, screw; 52, connecting portion; 53, limiting portion; 6, collet chuck. Detailed Embodiments

[0039] The following further describes the present application in detail with reference to the drawings and specific embodiments:

[0040] The embodiment of the present application discloses a precision grinder axial rapid positioning device and method, as shown in Figure 1 and Figure 2As shown, it includes a connecting device, an axial positioning rod 4 and a connecting rod 5. The connecting device is connected to the collet chuck 6 of the grinding machine. The axial positioning rod 4 passes through the connecting device, and the axial positioning rod 4 can be adjustably connected to the connecting device along its own axial direction. One end of the connecting rod 5 is detachably connected to the axial positioning rod 4. When workpieces to be machined with different sizes need to be positioned, by replacing different connecting rods 5, workpieces to be machined with positioning holes of different depths / diameters can be positioned. Secondly, the position of the axial positioning rod 4 can be adjusted along the axial direction of the axial positioning rod 4. When adjusted to the required axial position, the fixed axial positioning rod is fastened and fixed to complete the axial positioning.

[0041] As Figure 3 and Figure 4 shown, the connecting device includes a locking joint 2 and a conical locking device 3. The locking joint 2 is inserted into the conical locking device 3, and the locking joint 2 is threadedly connected to the conical locking device 3. The conical locking device 3 is provided with balls 31 floating along the radial direction of the conical locking device 3. The end face part of the thin rod of the locking joint 2 inserted into the conical locking device 3 is a mating conical surface 21. The mating conical surface 21 is used to push the balls 31 to move in a direction away from the axis of the conical locking device 3; along the insertion direction of the locking joint 2, the outer diameter of the mating conical surface 21 gradually decreases. One end of the conical locking device 3 is provided with an outer conical surface 32, and the maximum outer diameter of the outer conical surface 32 is not less than the inner diameter of the inner hole of the grinding machine collet chuck 6. The included angle between the mating conical surface 21 and the inner wall of the locking joint 2 is 13 - 17°. In this embodiment, the mating conical surface 21 is designed as a conical surface of 15°. The balls 31 are close to the end of the conical locking device 3 away from the outer conical surface 32, and at least three balls 31 are provided. The balls 31 are evenly distributed circumferentially around the conical locking device 3. In this embodiment, three balls 31 are evenly arranged circumferentially on the conical locking device 3.

[0042] As Figure 3 shown, the locking joint 2 is connected to the conical locking device 3 through threaded fit. As the locking joint 2 is gradually screwed into the conical locking device 3, the mating conical surface 21 gradually pushes the three balls 31 to move in a direction away from the axis of the conical locking device 3 until the three floating steel balls evenly distributed protrude and are locked on the inner wall of the collet chuck 6. Utilizing the principle of three points fixing a plane, through the support and jamming of the three floating balls 31, and combined with the cooperation between the outer conical surface 32 of the conical locking device 3 and the inner hole of the collet chuck 6, the radial and axial positioning and clamping of the whole tooling and the inner hole of the collet chuck 6 are realized, and the precise positioning of the positioning device is achieved.

[0043] As Figure 1As shown, the connecting device is connected with a positioning member. After the positioning member moves towards the axial positioning rod 4 and abuts against the axial positioning rod 4, the axial positioning rod 4 is fixed to the connecting device. The positioning member is a locking screw 1, and the locking screw 1 is threadedly connected to the locking joint. The axial positioning of the axial positioning rod 4 at its own axial position is realized through the locking screw 1 and the locking joint 2. The knurled part of the locking joint 2 has a threaded hole, and the locking screw 1 abuts against the internal axial positioning rod 4 at this position to realize the locking and fixing of the axial position. The locking screw 1 is a slotted screw. The axial positioning is realized by adjusting the position of the axial positioning rod 4 in the conical surface locking device 3; the locking and fixing of the axial position is realized by relying on the locking screw 1 and the locking joint 2.

[0044] After adopting the positioning and clamping device with a specific design, the quality of the key parts processed is stable, the production cycle is shortened, the production efficiency is improved, and a large amount of production costs are saved. Such a device can provide strong technical support for other machine tool equipment similar to those using the collet chuck 6.

[0045] As Figure 5 a and Figure 5 b shown, in addition, the large end of the axial positioning rod 4 is designed with an internal thread, and it is matched with connecting rods 5 of different sizes through the internal thread to meet the dimensional requirements and shape requirements for processing various fine parts. The connecting rod 5 includes a screw rod 51, a connecting portion 52, and a limiting portion 53 that are connected in sequence. The screw rod 51 is used to be threadedly connected with the axial positioning rod 4. One side of the connecting portion 52 facing the limiting portion 53 is a positioning surface, and the positioning surface is used to abut against the workpiece to be processed. The limiting portion 53 is used to be inserted into the positioning hole of the workpiece to be processed. The lengths and outer diameters of the limiting portions 53 of different connecting rods 5 are different.

[0046] The implementation principle of this application is as follows:

[0047] When the positioning device is installed in the collet chuck 6 of the grinding machine:

[0048] First, the outer conical surface 32 of the conical surface locking device 3 is matched with the inner hole of the collet chuck 6, and the locking joint 2 is connected to the conical surface locking device 3 through an internal thread. As the locking joint 2 is gradually screwed into the conical surface locking device 3, the mating conical surface 21 at the right end of the locking joint 2 gradually supports the three floating ball bearings 31 at the front end of the mating conical surface 21. When the locking joint 2 is screwed tightly, the mating conical surface 21 will support and lock the three steel balls against the inner hole wall of the collet chuck 6.

[0049] When workpieces to be processed with different sizes need to be positioned:

[0050] First, the rotatable connecting rod 5 can be rotated to replace different connecting rods 5 on the axial positioning rod 4. Different connecting rods 5 can position workpieces to be machined with positioning holes of different depths and diameters. Secondly, the locking screw 1 can be loosened. At this time, the axial positioning rod 4 can freely expand and contract along the axis direction of the locking joint. When adjusted to the required axial position, by tightening the locking screw 1, the axial positioning rod is firmly fixed to complete the axial positioning.

[0051] Although the present invention is disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined by the claims of the present invention.

Claims

1. An axial rapid positioning device for a precision grinding machine, characterized in that: Comprising An axially positioning rod (4) passing through a connecting device for connecting a grinding machine; The connecting device is connected with a positioning member. After the positioning member moves towards the axially positioning rod (4) and abuts against the axially positioning rod (4), the axially positioning rod (4) is fixed to the connecting device; ​ ​ ​ 2. The axial rapid positioning device of a precision grinding machine according to claim 1, characterized in that: ​ 3. The axial rapid positioning device of a precision grinding machine according to claim 1, wherein: ​ 4. The axial rapid positioning device of a precision grinding machine according to claim 1, characterized in that: ​ 5. A precision grinder axial rapid positioning device according to claim 1, characterized in that: ​ 6. The axial rapid positioning device of a precision grinding machine according to claim 1, characterized in that: ​ 7. The axial rapid positioning device of a precision grinding machine according to claim 1, characterized in that: ​ 8. The axial rapid positioning device of a precision grinding machine according to claim 7, characterized in that: ​ 9. A positioning method for the positioning device of the axial rapid positioning of a precision grinding machine according to any one of claims 1-8, characterized in that: ​ ​ ​ ​

Images