Split bearing assembly and hydraulic skiving tool

Abstract

The utility model discloses a kind of split type bearing assembly and hydraulic skiving cutter, split type bearing assembly includes non-ring frame, several ball fixing grooves are arranged in frame, locking portion is arranged in the top of frame, taper head counterbore is arranged on locking portion;The outer side left and right sides of frame are provided with guide bevel;Ball fixing groove is set with taper, its inner side surface cross section is greater than outer side surface cross section and maximum cross section is less than ball outer diameter.The utility model also discloses a kind of hydraulic skiving cutter using above-mentioned structure;When the present split type bearing assembly is extruded with center tool bar, ball stress area is a surface, when rolling processing, it extrudes cylinder wall without appearing indentation with optimum plane state, improves processing quality and also avoid ball wear, without frequently replacing ball;When ball is replaced, tool is not needed to be disassembled as a whole;Ball and bearing fixed frame's bearing point is surface combination, when rolling, will not cause ball wear rate increase, and rolling precision is higher.

Description

Technical Field

[0001] This utility model relates to the field of deep hole cutting tool technology, and in particular to a split bearing assembly and a hydraulic scraper. Background Technology

[0002] In the field of precision machining of workpiece inner diameter, scraping tools are usually used to achieve precision machining of deep hole inner diameters and hydraulic cylinder inner diameters, and then the inner diameter surface is further processed by rolling to obtain a high-precision inner diameter surface.

[0003] The existing integrated rolling tool has a complex structure, which includes a roughing tool, a finishing tool, a guide block, and a rolling module. The rolling module is usually designed with an annular bearing fixing frame, and then the cylindrical balls are fixed between the bearing fixing frame and the inner core. During processing, the roughing tool performs the initial processing, the finishing tool follows, and then the balls compress the inner wall being processed to achieve the processing requirements.

[0004] However, in the existing roller pressing module, the entire bearing fixing frame is ring-shaped. After the balls are constrained in the ball holes, when the balls expand outward, the internal extrusion blocks directly squeeze the balls, which causes the following problems: 1. The ball has a single force point, which means that the balls do not initially squeeze the cylinder wall in the optimal planar state during the working stage. This results in slight indentations during processing, which not only affects the processing quality but also increases the wear rate of the balls, requiring frequent ball replacement; 2. When replacing the balls, the entire tool must be disassembled, making ball replacement cumbersome; 3. There is an impact between the balls and the bearing fixing frame, which easily causes friction between the balls during rolling, increasing the wear rate of the balls and reducing the rolling accuracy.

[0005] In view of the shortcomings of existing technology, as a precision cutting tool manufacturer, there is an urgent need to improve the technology and design a hydraulic scraping and rolling tool accessory that can adopt a simpler assembly structure and completely solve the shortcomings of existing technology. Summary of the Invention

[0006] The purpose of this utility model is to provide a split bearing assembly and a hydraulic scraper. It adopts a split bearing fixing frame and improves the internal structure of the bearing fixing frame to reduce the impact with the small external front area during operation, reduce the wear rate, improve the rolling accuracy and stability, and enable quick replacement.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a split bearing assembly, comprising a non-annular frame, wherein a plurality of ball fixing grooves are provided within the frame, a locking part is provided at the top of the frame, and a conical countersunk hole is provided on the locking part; guide slopes are provided on the left and right sides of the outer side of the frame; the ball fixing grooves are tapered, wherein the inner side cross-section is larger than the outer side cross-section and the maximum cross-section is smaller than the outer diameter of the ball.

[0008] The ball bearing fixing groove is provided with corner clearance holes at the four corners, which allow for corner clearance after the ball bearings are installed.

[0009] The ball bearings are tapered, with the bottom diameter being smaller than the top diameter.

[0010] The locking part at the top of the frame is narrower than the width of the frame.

[0011] A hydraulic scraper includes a fixed base, a locking seat and a bearing fixing seat below the fixed base, a plurality of frames are provided on the bearing fixing seat, the plurality of frames are arranged in a ring, a tapered drive ring is provided inside the plurality of frames, and ball bearings are provided between the tapered drive ring and the frame.

[0012] The tapered drive ring is fixed on the central tool holder, and a finishing tool holder is provided below the tapered drive ring. The finishing tool holder is provided with a finishing blade and a finishing tool guide block. A coarse tool holder is provided below the finishing tool holder, and a coarse blade is provided on the coarse tool holder.

[0013] The tapered drive ring and the ball bearings are configured to complement each other.

[0014] The beneficial effects of this utility model are as follows: The split bearing assembly disclosed in this utility model has a non-annular frame design with several ball fixing grooves inside the frame. A locking part is provided at the top of the frame, and a conical countersunk hole is provided on the locking part. Guide slopes are provided on the left and right sides of the outer side of the frame. The ball fixing grooves are tapered, with the inner side cross-section being larger than the outer side cross-section and the maximum cross-section being smaller than the outer diameter of the ball. A hydraulic scraper using the above structure is also disclosed. When this split bearing assembly is pressed with the central tool holder, it has the following advantages: 1. The ball bearing area is a single surface. During rolling, it presses against the cylinder wall in the best planar state, without indentation during processing, improving processing quality and avoiding ball wear, thus eliminating the need for frequent ball replacement; 2. When replacing the ball, it is not necessary to disassemble the entire tool; 3. The bearing point between the ball and the bearing fixing frame is a surface connection. Friction between the ball and the bearing during rolling does not increase the ball wear rate, resulting in higher rolling accuracy. Attached Figure Description

[0015] Figure 1 This is a top view of the structure of this utility model;

[0016] Figure 2 This is a side view of the structure of this utility model;

[0017] Figure 3 yes Figure 2 Schematic diagram of the cross-section structure along direction A;

[0018] Figure 4 This is a schematic diagram of a ball bearing structure;

[0019] Figure 5 This is a schematic diagram of a hydraulic scraper.

[0020] Figure 6 This is a schematic diagram illustrating the working principle of a split bearing assembly;

[0021] Reference numerals: 1. Frame, 11. Locking part, 12. Countersunk hole of tapered head, 13. Guide slope, 2. Ball, 21. Coarse diameter end, 22. Fine diameter end, 3. Ball retaining groove, 31. Corner clearance hole, 32. Tapered slope, 4. Fixing seat, 41. End guide block, 5. Locking seat, 6. Bearing fixing seat, 7. Finishing tool holder, 71. Finishing tool, 72. Finishing tool guide block, 73. Tapered drive ring, 8. Coarse tool holder, 81. Coarse tool, 9. Center tool holder. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with the accompanying drawings. It should be understood that the following embodiments are merely illustrative examples. In the specific implementation, terms such as left and right, inside and outside, etc., may appear. These terms do not limit the structure of this utility model; they are merely textual descriptions of the specific placement positions in this embodiment. Their purpose is to facilitate understanding by those skilled in the art. Those skilled in the art can make various structural changes to the embodiments under the guidance of the specification, and such changes should fall within the scope of protection of the claims.

[0023] Example 1:

[0024] like Figure 1 , 2 As shown in Figures 3 and 4, a split bearing assembly includes a non-annular frame 1. Each frame 1 contains two ball bearing retaining grooves 3. A locking part 11 is provided at the top of each frame 1, and the locking part 11 has two conical countersunk holes 12. The conical countersunk holes 12 facilitate the fixing and locking of the locking screws. The width of the locking part 11 at the top of the frame 1 is smaller than the width of the frame 1. This structure can reduce the overall weight of the split bearing assembly to a certain extent while ensuring the overall strength of the frame.

[0025] The frame 1 has guide ramps 13 on its outer left and right sides to prevent contact or collision with external objects during machining inside the holes; the ball bearing fixing groove 3 is tapered, with its inner side cross-section larger than its outer side cross-section and its maximum cross-section smaller than the outer diameter of the ball bearing. This design structure can be referenced. Figure 3 As shown, this design allows the balls to achieve surface contact and compression with the ball retaining groove 3 during outward expansion, avoiding point contact damage to the balls 2 during compression; the balls 2 are tapered, as shown... Figure 4 As shown, its bottom diameter is smaller than its top diameter, with the bottom being the narrower end 22 and the top being the wider end 21.

[0026] Furthermore, corner clearance holes 31 are provided at the four corners of the ball fixing groove 3. The corner clearance holes 31 are used to achieve corner clearance after the ball 2 is installed, so as to prevent the ball 2 from colliding with the ball fixing groove 3 after assembly.

[0027] Example 2:

[0028] A hydraulic scraper employs the aforementioned split-type bearing assembly. For example... Figure 5 , 6 As shown, it includes a fixed base 4, on which an end guide block 41 is provided; a locking seat 5 and a bearing fixing seat 6 are provided below the fixed base 4, and several frames 1 are provided on the bearing fixing seat 6, which are arranged in a ring. A tapered drive ring 73 is provided inside the frames 1, and a ball bearing 2 is provided between the tapered drive ring 73 and the frame 1; the tapered drive ring 73 is fixed on the central tool holder 9, and a finishing tool holder 7 is provided below the tapered drive ring 73, on which a finishing tool 71 and a finishing tool guide block 72 are provided; a coarse tool holder 8 is provided below the finishing tool holder 7, on which a coarse tool 81 is provided. Furthermore, the tapered drive ring 73 and the ball bearing 2 are complementaryly fitted.

[0029] When the aforementioned hydraulic scraper is running, this split bearing assembly is located on the rear side of the roughing tool holder 8 and the finishing tool holder 7. The tapered drive ring 73 is fixed to the central tool holder 9. When roll forming is required, the central tool holder 9 drives the tapered drive ring 73 to move backward. The tapered drive ring 73 compresses the ball 2 to achieve the outward expansion of the ball 2. During the outward expansion of the ball 2, the tapered drive ring 73 and the ball 2 complement each other, and the ball 2 expands outward smoothly. Its force-bearing area is a single surface. During roll forming, it compresses the cylinder wall in the best planar state. Compared with the single-point or certain area compression contact in the prior art, this design will not produce indentations, improve the processing quality, and avoid ball wear, eliminating the need for frequent ball replacement. The ball 2 is a consumable, and when replacing it, it is not necessary to disassemble the entire tool. The ball 2 is compressed with the tapered inclined surface 32 inside the bearing fixing frame 1. The bearing area of ​​both is a single surface, which will not cause an increase in the wear rate of the ball 2 during rolling, resulting in higher roll forming accuracy.

Claims

1. A split-type bearing assembly, characterized in that: The device includes a non-annular frame with several ball bearing retaining grooves inside. A locking part is provided at the top of the frame, and a conical countersunk hole is provided on the locking part. Guide slopes are provided on the left and right sides of the outer side of the frame. The ball bearing retaining grooves are tapered, with the inner side cross-section being larger than the outer side cross-section and the maximum cross-section being smaller than the outer diameter of the ball. The ball bearings are tapered, with the bottom diameter being smaller than the top diameter.

2. The split bearing assembly according to claim 1, characterized in that... The ball bearing fixing groove is provided with corner clearance holes at the four corners, which allow for corner clearance after the ball bearings are installed.

3. The split bearing assembly according to claim 1, characterized in that... The width of the locking part at the top of the frame is smaller than the width of the frame.

4. A hydraulic scraper, comprising the split bearing assembly as described in claim 1, characterized in that... It includes a fixed base, a locking seat and a bearing fixing seat below the fixed base, several frames are arranged on the bearing fixing seat, the several frames are arranged in a ring, a tapered drive ring is arranged inside the several frames, and ball bearings are arranged between the tapered drive ring and the frame; the tapered drive ring is fixed on the central tool holder, a finishing tool holder is arranged below the tapered drive ring, a finishing tool holder is arranged on the finishing tool holder, and a finishing tool guide block is arranged on the finishing tool holder; a coarse tool holder is arranged below the finishing tool holder, and a coarse tool is arranged on the coarse tool holder.

5. A hydraulic scraper as described in claim 4, characterized in that... The tapered drive ring and the ball bearings complement each other.

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