Conical hole surface profile tolerance rounding device

Abstract

A conical hole surface profile tolerance rounding device comprises a cutter bar arranged on one side of the large end of a conical hole, and the axis of the cutter bar and the axis of the conical hole are eccentrically arranged. The front end of the cutter bar is rotatably connected with a rolling wheel, the outer surface of the rolling wheel is an arc-shaped surface, the large end of the rolling wheel and the large end of the taper hole are oppositely arranged, and the rear end of the cutter bar is fixed to the cutter holder through an axial adjusting mechanism. According to the utility model, the problem of poor surface profile caused by abrasion of materials or cutters on the inner surface of the taper hole in the prior art is solved, the surface profile tolerance can reach the quality level of 0.003-0.006, the tolerance is reduced by 2 / 3 compared with that of turning, the surface roughness can be improved from Ra1.6 to Ra0.5, and the surface roughness can be improved from Ra1.6 to Ra0.5. And the machining precision of the inner surface of the taper hole is greatly improved.

Description

Technical Field

[0001] The utility model relates to a rounding device, in particular to a tapered hole surface profile rounding device. Background Art

[0002] The connection between the clutch drive assembly and the axle is basically a tapered hole design. The advantages of the tapered design are: the connection between the two parts can eliminate the gap, achieve seamless connection, and eliminate problems caused by poor coordination between the clutch and the axle, such as: vehicle shaking, product wear, reduced service life, or falling off during riding, causing safety hazards.

[0003] At present, the processing of tapered holes is generally done by CNC lathes or CNC grinders (actually, internal cylindrical grinders can only process parts with tapered through-hole designs, and there are no mature processing cases for blind hole designs, and the grinding height must be consistent). This processing method affects the quality of the tapered hole, mainly the surface profile. The current capacity of high-precision CNC lathes can only guarantee a surface profile below 0.02mm, while for high-precision products, the surface profile requirement is higher, and needs to be below 0.0076mm. Therefore, the current CNC lathe and CNC grinder processing cannot meet the company's requirements for the surface profile of the tapered hole in the clutch drive assembly. The above are the shortcomings of the existing technology. Utility Model Content

[0004] The purpose of the utility model is to solve the problems raised in the above background technology, and then propose a device for rounding the contour of a tapered hole surface.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a device for rounding the contour of a tapered hole surface, comprising a tool rod arranged on one side of the large end of the tapered hole, the axis of the tool rod being eccentrically arranged to the axis of the tapered hole; the front end of the tool rod is rotatably connected to a rolling wheel, the outer surface of the rolling wheel is an arc-shaped surface, the large end of the rolling wheel is arranged opposite to the large end of the tapered hole, and the rear end of the tool rod is fixed to the tool seat by an axial adjustment mechanism.

[0006] A further improvement of the utility model is that the front end of the knife rod is rotatably connected to a guide post, and the guide post passes through the inner hole of the rolling wheel and is fixedly connected to the rolling wheel.

[0007] A further improvement of the utility model is that the knife rod and the guide column are rotatably connected via a bearing.

[0008] A further improvement of the utility model is that a baffle is arranged at the front end of the guide column, and the baffle is arranged in the groove of the rolling wheel so that the baffle and the rolling wheel are on the same plane.

[0009] A further improvement of the utility model is that a protective cover is fixed to the outside of the front end of the knife rod, and the bearing is located in the protective cover.

[0010] A further improvement of the utility model is that an extension plate is provided on one side of the protective cover, and the curvature of the extension plate is 175°-185°.

[0011] A further improvement of the utility model is that a shock absorbing mechanism is arranged on the knife rod.

[0012] A further improvement of the utility model is that the shock absorbing mechanism comprises a shock absorbing hole arranged on the knife rod, the axis of the shock absorbing hole is arranged vertically, and one side of the shock absorbing hole is connected to the shock absorbing notch.

[0013] A further improvement of the utility model is that the axial adjustment mechanism includes a bolt, the knife seat is provided with a bolt, and the knife rod is provided with a bolt hole used in conjunction with the bolt.

[0014] A further improvement of the utility model is that the upper surface and the lower surface of the knife rod are both planes.

[0015] The beneficial effects of the utility model are as follows: the utility model overcomes the problem of poor surface contour caused by material or tool wear in the current processing of the inner surface of the tapered hole. After the roller burnishing operation is performed by adopting the utility model, the surface contour can reach a quality level of 0.003-0.006, which is 2 / 3 less than the tolerance of turning, and the surface roughness can be increased from Ra1.6 to Ra0.5, which greatly improves the processing accuracy of the inner surface of the tapered hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a specific implementation method of the utility model;

[0017] Figure 2 It is a schematic diagram of the top view structure of the utility model;

[0018] Figure 3 for Figure 2 AA cross-sectional structure diagram;

[0019] Figure 4 for Figure 1 A magnified view of the structure in the middle.

[0020] Figure 5 It is a schematic diagram of the exploded structure of the tool rod, rolling wheel, guide column and bearing.

[0021] In the figure, 1 is a clutch, 11 is a tapered hole, 2 is a tool rod, 21 is a plane, 3 is a rolling wheel, 31 is a groove, 4 is a tool holder, 5 is a guide column, 51 is a baffle, 6 is a bearing, 7 is a protective cover, 71 is an extension plate, 8 is a shock absorbing mechanism, 81 is a shock absorbing hole, 82 is a shock absorbing notch, 9 is an adjustment mechanism, and 91 is a bolt. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other implementation examples obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. The utility model is further described in combination with the drawings and embodiments:

[0023] like Figure 1-5 As shown, a device for rounding the contour of a tapered hole surface comprises a tool rod 2 arranged on one side of the large end of the tapered hole 11, the axis of the tool rod 2 being eccentrically arranged to the axis of the tapered hole 11; the front end of the tool rod 2 is rotatably connected to a rolling wheel 3, the outer surface of the rolling wheel 3 is an arc-shaped surface, the large end of the rolling wheel 3 is arranged opposite to the large end of the tapered hole 11, and the rear end of the tool rod 2 is fixed to the tool seat 4 by an axial adjustment mechanism 9.

[0024] In the utility model, the rolling wheel 3 is used as a rolling burnishing tool for rolling burnishing the tapered hole 11 of the clutch 1. Since the shape of the rolling wheel 3 is designed as an arc surface, it can match the angle of the tapered hole 11. When the clutch workpiece rotates, the rolling wheel 3 can rotate with the workpiece, thereby achieving the rolling burnishing of the tapered inner hole, while also avoiding the formation of lines on the surface of the inner hole of the part due to extrusion, which damages the surface of the workpiece. The rolling burnishing tool of the utility model adopts a steel-bonded carbide model GT35.

[0025] Specifically, after turning, the tool of the utility model is installed on the tool holder, and the position of the tool rod 2 is adjusted by the axial adjustment mechanism 9, and the rolling wheel 3 is located in the tapered inner hole. The rotation of the clutch workpiece drives the rotation of the rolling wheel 3 to realize the rolling process. The rolling speed F = 0.06, the rolling reserve is 0.02, the inner hole size is stable after rolling, and the angle can be controlled within ±1'. After two rolling, the surface profile can reach a quality level of 0.003-0.006, which is 2 / 3 less than the tolerance of turning, and the surface roughness can be increased from Ra1.6 to Ra0.5.

[0026] Furthermore, the front end of the knife bar 2 is rotatably connected to the guide post 5, and the guide post 5 passes through the inner hole of the rolling wheel 3 and is fixedly connected to the rolling wheel 3. Such a design ensures both the flexible rotation of the rolling wheel 3 and its stability. In order to further improve the smoothness of the rotation, the knife bar 2 and the guide post 5 are rotatably connected via a bearing 6.

[0027] Furthermore, a baffle 51 is disposed at the front end of the guide column 5 , and the baffle 51 is disposed in the groove 31 of the rolling wheel 3 , so that the baffle and the rolling wheel 3 are on the same plane.

[0028] In order to prevent iron filings from entering the bearing 6 and damaging the bearing during the rolling process, the utility model fixes a protective cover 7 on the outside of the front end of the shank 2, and the bearing 6 is located in the protective cover 7, so as to isolate the bearing 6 from the external rolling environment. At the same time, in order to reduce the splashing of iron filings during the rolling process, the utility model provides an extension plate 71 on one side of the protective cover 7, and the curvature of the extension plate 71 is 175°-185°, preferably 180°, and the extension plate plays a role in blocking iron filings.

[0029] Furthermore, a shock absorbing mechanism 8 is provided on the knife bar 2. Specifically, the shock absorbing mechanism 8 includes a shock absorbing hole 81 provided on the knife bar 2, the axis of the shock absorbing hole 81 is vertically provided, and one side of the shock absorbing hole 81 is connected to the shock absorbing notch 82. The shock absorbing mechanism plays a role of shock absorption and can buffer hard impacts during the rolling process.

[0030] Furthermore, the axial adjustment mechanism includes a bolt 91, the blade seat is provided with the bolt 91, and the blade rod 2 is provided with a bolt hole used in conjunction with the bolt 91. The operator can easily adjust the position of the blade rod 2 in the axial direction according to actual needs, thereby ensuring the accuracy of the rolling operation.

[0031] Furthermore, in order to facilitate the fixation of the knife rod 2 and realize the reliable connection between the knife rod 2 and the knife seat, the upper surface and the lower surface of the knife rod 2 in the utility model are both planes 21.

[0032] The utility model solves the problem of accuracy that can only be achieved by grinding, honing and boring, but grinding has restrictions on the shape of parts, the design of the tool has limitations and the investment is large, while the utility model has low cost and high processing efficiency, and has a wide range of adaptability to part shapes, and can be extended to similar products such as tapered holes or round holes for processing the inner diameter surface, and parts with higher contour requirements.

[0033] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions in the specification are only to illustrate the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the protection required by the utility model. The scope of protection required by the utility model is defined by the attached claims and their equivalents.

Claims

1. A device for rounding the contour of a tapered hole, characterized in that: It includes a tool rod arranged on one side of the large end of the tapered hole, the axis of the tool rod is eccentrically arranged with respect to the axis of the tapered hole; the front end of the tool rod is rotatably connected with a rolling wheel, the outer surface of the rolling wheel is an arc-shaped surface, the large end of the rolling wheel is arranged opposite to the large end of the tapered hole, and the rear end of the tool rod is fixed to the tool seat by an axial adjustment mechanism.

2. The tapered hole surface contour rounding device according to claim 1, characterized in that: The front end of the knife rod is rotatably connected to the guide post, and the guide post passes through the inner hole of the rolling wheel and is fixedly connected to the rolling wheel.

3. The tapered hole surface contour rounding device according to claim 2, characterized in that: The knife rod and the guide column are rotatably connected via a bearing.

4. The tapered hole surface contour rounding device according to claim 2, characterized in that: A baffle is arranged at the front end of the guide column, and the baffle is arranged in the groove of the rolling wheel so that the baffle and the rolling wheel are on the same plane.

5. The tapered hole surface contour rounding device according to claim 3, characterized in that: A protective cover is fixed to the outside of the front end of the knife rod, and the bearing is located in the protective cover.

6. The tapered hole surface contour rounding device according to claim 5, characterized in that: An extension plate is arranged on one side of the protective cover, and the curvature of the extension plate is 175°-185°.

7. The tapered hole surface contour rounding device according to claim 1, characterized in that: The knife bar is provided with a shock absorbing mechanism.

8. The tapered hole surface contour rounding device according to claim 7, characterized in that: The shock absorbing mechanism comprises a shock absorbing hole arranged on the knife rod, the axis of the shock absorbing hole is arranged vertically, and one side of the shock absorbing hole is communicated with the shock absorbing notch.

9. The tapered hole surface contour rounding device according to claim 1, characterized in that: The axial adjustment mechanism comprises a bolt, the tool seat is provided with a bolt, and the tool rod is provided with a bolt hole used in conjunction with the bolt.

10. The tapered hole surface contour rounding device according to claim 1, characterized in that: The upper surface and the lower surface of the knife rod are both planes.

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