High-precision tool for machining inner hole of sun gear

Abstract

The utility model discloses a sun gear inner hole machining high-precision tool which comprises a tool base and a V-shaped base, the V-shaped base is installed at the top end of the tool base, a V-shaped cover is arranged at the top end of the V-shaped base, a hinge shaft is installed at the bottom end of the V-shaped cover, and the V-shaped cover is movably connected with the V-shaped base through the hinge shaft. A sun gear body is arranged between the V-shaped cover and the V-shaped seat, a round seat is installed at the top end of the tool seat on one side of the sun gear body, a second hole is formed in the portion, above the round seat, of the sun gear body, and a first hole is formed in the portion, above the second hole, of the sun gear body. According to the high-precision tool for machining the inner hole of the sun gear, convenient and fast inner hole positioning machining of the high-precision tool for machining the inner hole of the sun gear is achieved, rapid positioning machining through the positioning reference interchange principle is facilitated, the machining precision of the two holes is improved, the qualified rate of machining of the inner hole of the sun gear is increased, and the convenience of taking pieces during machining of the inner hole of the sun gear is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of high-precision tooling, in particular to a high-precision tooling for processing the inner hole of a sun gear. Background Art

[0002] As the quality requirements of engineering machinery products become higher and higher, the manufacturing of some transmission shafts and holes is more stringent. Among the factors that affect manufacturing quality, how to improve the accuracy of process equipment is the key. Through continuous exploration and summarization of experience, tooling suitable for improving hole positioning accuracy is designed. Tooling design often uses internal hole positioning. The traditional positioning method is to obtain it by matching the pin shaft with the workpiece hole. Considering the convenience of loading and unloading the workpiece, there must be a certain gap between the positioning element and the workpiece to be positioned. This is also one of the reasons for the positioning error. In the occasion where the design requires high hole positioning accuracy, if the machining accuracy of the positioning element is improved, or the manufacturing tolerance value of the hole used for positioning on the workpiece is reduced, the process cost will be greatly increased, and high-precision positioning is difficult to maintain for a long time. It is also necessary to strengthen the detection and maintenance of the positioning element, which increases the management cost. This positioning method is difficult to achieve the high-precision hole positioning requirements;

[0003] The sun gear technology requires the core heat treatment hardness to reach HRC35-48. The processing technology it uses is: rough turning the outer circle - rough boring - fine turning the outer circle - milling spline - fine boring. In the key process of fine boring, the processing tolerance range of the hole Φ30 is 0.028, the coaxiality requirement is Φ0.04, and the distance between the two hole ends is 88mm; the position of the two holes to the center line is required to be Φ0.3. In the entire process, the coaxiality of the two holes in the key process of fine boring is the most difficult to achieve. Because the position of the two holes to the center line of the shaft is not required to be high, the traditional process method is to use the outer circle of the rod for positioning, clamping on the boring machine once, and completing the processing in one pass. We process it on the machining center TC1000 with better rigidity. The tools have successively selected domestic tools and the Santveit boring tools with better performance for trial processing. It was found that the results were not ideal. The reasons are analyzed as follows:

[0004] 1) The boring stroke is 88mm, the actual processing stroke is about 100mm, and the single-side processing allowance is 0.3mm. Because the material is hard, the boring tool is not strong enough after completing the long-distance processing, and a tapered hole appears, that is, the hole at one end is about 0.04mm larger than the hole at the other end, and the hole size is out of tolerance. Because fine boring is a process after heat treatment, considering the influence of deformation, the processing allowance left for fine boring cannot be reduced, and it is not economical to pass the tool in multiple times;

[0005] 2) When the tool blade completes one hole processing and then turns to another hole processing, it does not contact the plane. The boring bar is subjected to uneven radial force, which is very easy to vibrate and break the tool. At the same time, the tool will produce radial deviation, affecting the coaxiality of the two holes;

[0006] Based on the above analysis, in order to ensure the requirements of product size and shape and position accuracy, the influence of two factors must be considered: one is the strength of the tool; the other is that the radial force of the tool is uniform during cutting. The measures taken include shortening the extension distance of the boring bar and processing from the outside of the sun gear fork to the inside. There are two options: Option 1 is to use a double-sided boring machine, but it requires additional equipment, and the coaxiality of the boring bar of an ordinary double-sided boring machine is difficult to meet the requirement of 0.04mm. The high-precision double-sided boring machine is expensive, and Option 1 is less economical. Another option is to use one hole to position the precision boring of another hole, and then use the hole after precision boring for positioning processing. The positioning reference interchange processing is used. In traditional designs, this solution is This can be achieved on a common boring machine with slightly better rigidity. The key lies in solving the problem of how to maintain positioning accuracy during the datum interchange process. This is a typical internal hole positioning processing method. In the past, fixed pin positioning holes were mostly used in designs. In order to fit holes of different sizes, the pins must be replaced during the datum conversion process. For example, when processing the Φ30 hole of the sun gear, the first positioning hole size is Φ29.4±0.1, and the positioning pin size is Φ29.54; the second positioning hole size is Φ30, and the positioning pin size is Φ30. In order to ensure loading and unloading, each positioning is clearance fit, and the positioning error is 0.01~0.053, which exceeds the coaxiality requirement of the product. The traditional tooling design scheme is not applicable; Utility Model Content

[0007] The purpose of the utility model is to provide a high-precision tooling for processing the inner hole of the sun gear, so as to solve the problem that the high-precision tooling proposed in the above-mentioned background technology is not convenient for convenient inner hole positioning processing, is not conducive to rapid positioning processing using the positioning reference interchange principle, affects the accuracy of the two-hole processing, affects the qualified rate of the sun gear inner hole processing, and affects the convenience of taking parts when processing the inner hole of the sun gear.

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a high-precision tooling for processing the inner hole of a sun gear, comprising a tooling seat and a V-shaped seat, the top of the tooling seat is equipped with a V-shaped seat, the top of the V-shaped seat is provided with a V-shaped cover, the bottom end of the V-shaped cover is equipped with a hinge shaft, and the V-shaped cover is movably connected to the V-shaped seat through the hinge shaft, a sun gear body is arranged between the V-shaped cover and the V-shaped seat, a round seat is installed at the top of the tooling seat on one side of the sun gear body, a second hole is arranged inside the sun gear body above the round seat, a first hole is arranged inside the sun gear body above the second hole, a threaded rod is installed at the center position of the top of the round seat, a conical threaded sleeve is arranged at the top of the threaded rod, and the conical threaded sleeve is threadedly connected to the threaded rod, a center shaft is installed at the top of the conical threaded sleeve, a limiting ring is slidably sleeved on the outer wall of the center shaft, and the limiting ring is fixedly connected to the tooling seat.

[0009] Preferably, four groups of slide grooves with equal spacing are arranged inside the limiting ring, and rolling balls are arranged inside the slide grooves.

[0010] Preferably, a keyway is provided at the top of the tooling seat on one side of the ball, and an L-shaped block is slidably installed inside the keyway.

[0011] Preferably, an arc block is installed on the outer wall of the L-shaped block above the keyway, and a baffle is installed on the top of the tooling seat below the arc block.

[0012] Preferably, springs are installed on one side of the baffle plate close to the L-shaped block, and the springs are connected to the L-shaped block.

[0013] Preferably, a hexagonal hole is provided at the center position of the top end of the central shaft, and the hexagonal hole penetrates into the interior of the central shaft.

[0014] Preferably, a limiting hole is provided on a side of the top end of the V-shaped seat away from the hinge shaft, a T-shaped bolt is provided inside the limiting hole, and the T-shaped bolt extends to the outside of the V-shaped cover.

[0015] Preferably, a gasket is mounted on the top end of the T-bolt, and a nut sleeve is mounted on the top end of the T-bolt above the gasket.

[0016] Compared with the prior art, the beneficial effects of the utility model are: the high-precision tooling not only realizes the convenient inner hole positioning processing of the sun gear inner hole processing, facilitates the rapid positioning processing using the positioning reference interchange principle, improves the accuracy of the two-hole processing, but also improves the qualified rate of the sun gear inner hole processing, and improves the convenience of taking parts when processing the sun gear inner hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the three-dimensional structure of the sun gear body of the utility model;

[0019] Figure 3 It is a schematic diagram of the three-dimensional structure of the tooling seat of the utility model;

[0020] Figure 4 It is a three-dimensional enlarged structural schematic diagram of the round seat of the utility model;

[0021] Figure 5 It is a schematic diagram of the enlarged front cross-section structure of the rolling ball of the utility model.

[0022] In the figure: 1. tooling seat; 2. limiting hole; 3. T-bolt; 4. gasket; 5. nut sleeve; 6. V-shaped cover; 7. hinge shaft; 8. V-shaped seat; 9. sun gear body; 10. first hole; 11. second hole; 12. round seat; 13. limiting ring; 14. hexagonal hole; 15. center axis; 16. arc block; 17. baffle; 18. keyway; 19. L-shaped block; 20. spring; 21. tapered thread sleeve; 22. threaded rod; 23. slide groove; 24. ball. DETAILED DESCRIPTION

[0023] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0024] See also Figure 1-5 The utility model provides an embodiment: a high-precision tooling for processing the inner hole of a sun gear, comprising a tooling seat 1 and a V-shaped seat 8, the top of the tooling seat 1 is equipped with a V-shaped seat 8, the top of the V-shaped seat 8 is provided with a V-shaped cover 6, the bottom of the V-shaped cover 6 is equipped with a hinge shaft 7, and the V-shaped cover 6 is movably connected to the V-shaped seat 8 through the hinge shaft 7, a sun gear body 9 is provided between the V-shaped cover 6 and the V-shaped seat 8, a round seat 12 is installed on the top of the tooling seat 1 on one side of the sun gear body 9, and the round seat 12 is provided with a hinge shaft 7. A second hole 11 is provided inside the square sun gear body 9, a first hole 10 is provided inside the sun gear body 9 above the second hole 11, a threaded rod 22 is installed at the center position of the top of the round seat 12, a conical threaded sleeve 21 is provided at the top of the threaded rod 22, and the conical threaded sleeve 21 is threadedly connected with the threaded rod 22, a center shaft 15 is installed at the top of the conical threaded sleeve 21, a limit ring 13 is slidably sleeved on the outer wall of the center shaft 15, and the limit ring 13 is fixedly connected to the tooling seat 1;

[0025] The interior of the limiting ring 13 is provided with four groups of slide grooves 23 with equal spacing, and the interior of the slide grooves 23 is provided with a ball 24, and the top of the tooling seat 1 on one side of the ball 24 is provided with a key groove 18, and the interior of the key groove 18 is slidably installed with an L-shaped block 19;

[0026] The outer wall of the L-shaped block 19 above the keyway 18 is equipped with an arc block 16, and the top of the tooling seat 1 below the arc block 16 is equipped with a baffle 17;

[0027] When in use, the sun gear body 9 is placed between the V-shaped cover 6 and the V-shaped seat 8, the T-bolt 3 is rotated inside the limiting hole 2, the T-bolt 3 is inserted into the inside of the V-shaped cover 6, the gasket 4 is sleeved on the surface of the T-bolt 3, and the nut sleeve 5 is sleeved on the surface of the T-bolt 3 to fix the V-shaped cover 6 and the V-shaped seat 8, to fix the sun gear body 9, to facilitate the processing of the first hole 10 or the second hole 11, when a group of first holes 10 or second holes 11 are processed, use the processed hole as the positioning reference to process another hole, and fix the sun gear body 9 again, and the processed first hole 10 or second hole 11 is inserted into multiple groups of arcs The staff holds the hexagonal wrench and inserts it into the hexagonal hole 14, rotates the central shaft 15, and the conical thread sleeve 21 is driven to rotate by the central shaft 15. Under the cooperation of the conical thread sleeve 21 and the threaded rod 22, the conical thread sleeve 21 is driven to move downward, and the conical thread sleeve 21 squeezes the ball 24, and the ball 24 slides inside the slide groove 23. The ball 24 drives the L-shaped block 19 to slide inside the key groove 18 to simultaneously drive the four groups of L-shaped blocks 19 to move, and the L-shaped block 19 drives the arc block 16 to move, and the four groups of arc blocks 16 are used to position the first hole 10 or the second hole 11 that has been processed. The design of this tooling draws on the principle of expansion sleeves, and Taking advantage of the characteristics of the parts, the mechanical structure is used to achieve tension positioning. Under the condition that the manufacturing accuracy meets the requirements, the coaxiality of the hole processed by the tooling can reach Φ0.02mm using an ordinary boring machine. The characteristics of this tooling positioning are simple structure, high positioning accuracy, and variable positioning hole size. However, the following points must be noted during design: the center shaft 15, the tapered threaded sleeve 21, the ball 24, and the limit ring 13 are the components with the greatest force. Too much positioning error cannot be generated due to material deformation. They must have high hardness and high wear resistance. It is recommended to use T10 carbon tool steel for the first hole, which affects the positioning accuracy and the mutual movement between components. The tolerance is as small as possible. For example, although the center shaft 15 and the limit ring 13 are clearance fit, the tolerance is required to be small. The large outer circle of the arc block 16 can be used as a positioning with the outside. This part has coaxiality requirements with the limit ring 13 and the center shaft 15 to ensure that the center of the entire tooling is consistent with the hole center of the positioned workpiece. The gap between the keyway 18 and the upper surface of the L-shaped block 19 should be less than 0.015mm, and the gap between the two sides should be less than 0.03mm, which realizes the convenient inner hole positioning processing of the sun gear inner hole machining high-precision tooling, facilitates the rapid positioning processing using the positioning reference interchange principle, improves the accuracy of the two-hole machining, and improves the qualified rate of the sun gear inner hole machining;

[0028] A spring 20 is installed on the side of the baffle 17 close to the L-shaped block 19, and the spring 20 is connected to the L-shaped block 19. A hexagonal hole 14 is provided at the center position of the top of the central shaft 15, and the hexagonal hole 14 penetrates into the interior of the central shaft 15. A limiting hole 2 is provided on the side of the top of the V-shaped seat 8 away from the hinge shaft 7. A T-shaped bolt 3 is provided inside the limiting hole 2, and the T-shaped bolt 3 extends to the outside of the V-shaped cover 6.

[0029] The top of the T-bolt 3 is provided with a gasket 4, and the top of the T-bolt 3 above the gasket 4 is provided with a nut sleeve 5;

[0030] When in use, when the sun gear body 9 needs to be taken out, the gasket 4 and the nut sleeve 5 are disengaged from the T-bolt 3, and the V-shaped cover 6 and the V-shaped seat 8 are changed from a compressed state to a loose state on the sun gear body 9, and the hexagonal wrench is inserted into the inside of the hexagonal hole 14, and the central shaft 15 is rotated in the opposite direction, and the tapered threaded sleeve 21 is moved out from the surface of the threaded rod 22, and the tapered threaded sleeve 21 is changed from a compressed state to a loose state on the ball 24, and under the support of the baffle 17, the spring 20 elastically drives the L-shaped block 19 to move, and the L-shaped block 19 slides inside the keyway 18, and the L-shaped block 19 drives the arc block 16 to move, and the arc block 16 is disengaged from the first hole 10 or the second hole 11 to facilitate the removal of the sun gear body 9, thereby realizing the convenient removal of workpieces by high-precision tooling for processing the inner hole of the sun gear, and improving the convenience of removing parts during processing the inner hole of the sun gear.

[0031] When the embodiment of the present application is in use: first, the sun gear body 9 is placed between the V-shaped cover 6 and the V-shaped seat 8, the T-bolt 3 rotates inside the limiting hole 2, the T-bolt 3 is inserted into the inside of the V-shaped cover 6, the gasket 4 is sleeved on the surface of the T-bolt 3, and the nut sleeve 5 is sleeved on the surface of the T-bolt 3 to fix the V-shaped cover 6 and the V-shaped seat 8, to fix the sun gear body 9, to facilitate the processing of the first hole 10 or the second hole 11, when a group of first holes 10 or second holes 11 are processed, use the processed hole as the positioning reference to process another hole, fix the sun gear body 9 again, and the processed first hole 10 or second hole 11 is inserted into the surface of multiple groups of arc blocks 16, the staff holds the hexagonal wrench and inserts it into the hexagonal hole 14, rotates the central shaft 15, and the tapered threaded sleeve 21 is driven by the central shaft 15 to rotate, and the tapered threaded sleeve 21 is driven to move downward under the cooperation of the tapered threaded sleeve 21 and the threaded rod 22, and the tapered threaded sleeve 21 squeezes the ball 24, The ball 24 slides inside the slide groove 23, and the ball 24 drives the L-shaped block 19 to slide inside the key groove 18, thereby driving the four groups of L-shaped blocks 19 to move at the same time. The L-shaped block 19 drives the arc block 16 to move, and the four groups of arc blocks 16 position the first hole 10 or the second hole 11 that has been processed. When the sun gear body 9 needs to be removed, the gasket 4 and the nut sleeve 5 are separated from the T-bolt 3, and the V-shaped cover 6 and the V-shaped seat 8 are changed from the tightening state to the loosening state of the sun gear body 9, and the hexagonal wrench is inserted into the Inside the hexagonal hole 14, the central axis 15 rotates in the opposite direction, and the tapered threaded sleeve 21 moves out from the surface of the threaded rod 22. The tapered threaded sleeve 21 changes the state of the ball 24 from being compressed to being loosened. Under the support of the baffle 17, the spring 20 elastically drives the L-shaped block 19 to move, and the L-shaped block 19 slides inside the keyway 18. The L-shaped block 19 drives the arc block 16 to move, and the arc block 16 is disengaged from the first hole 10 or the second hole 11 to facilitate the removal of the sun gear body 9 and complete the use of the high-precision tooling.

[0032] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A high-precision tooling for machining the inner hole of a sun gear, characterized by: The invention comprises a tooling seat (1) and a V-shaped seat (8), wherein the top end of the tooling seat (1) is provided with a V-shaped seat (8), the top end of the V-shaped seat (8) is provided with a V-shaped cover (6), the bottom end of the V-shaped cover (6) is provided with a hinge shaft (7), and the V-shaped cover (6) is movably connected to the V-shaped seat (8) via the hinge shaft (7), a sun gear body (9) is provided between the V-shaped cover (6) and the V-shaped seat (8), a round seat (12) is provided at the top end of the tooling seat (1) on one side of the sun gear body (9), and a sun gear body (9) above the round seat (12) is provided inside the sun gear body (9) A second hole (11) is provided, a first hole (10) is provided inside the sun gear body (9) above the second hole (11), a threaded rod (22) is installed at the center position of the top end of the round seat (12), a conical threaded sleeve (21) is provided at the top end of the threaded rod (22), and the conical threaded sleeve (21) is threadedly connected to the threaded rod (22), a center shaft (15) is installed at the top end of the conical threaded sleeve (21), a limit ring (13) is slidably sleeved on the outer wall of the center shaft (15), and the limit ring (13) is fixedly connected to the tooling seat (1).

2. The high-precision tooling for machining the inner hole of a sun gear according to claim 1, characterized in that: Four groups of slide grooves (23) with equal spacing are arranged inside the limiting ring (13), and rolling balls (24) are arranged inside each of the slide grooves (23).

3. The high-precision tooling for machining the inner hole of a sun gear according to claim 2, characterized in that: The top of the tooling seat (1) on one side of the rolling ball (24) is provided with a keyway (18), and an L-shaped block (19) is slidably mounted inside the keyway (18).

4. The high-precision tooling for machining the inner hole of a sun gear according to claim 3, characterized in that: An arc block (16) is installed on the outer wall of the L-shaped block (19) above the keyway (18), and a baffle (17) is installed on the top of the tooling seat (1) below the arc block (16).

5. The high-precision tooling for machining the inner hole of a sun gear according to claim 4, characterized in that: A spring (20) is installed on one side of the baffle (17) close to the L-shaped block (19), and the spring (20) is connected to the L-shaped block (19).

6. The high-precision tooling for machining the inner hole of a sun gear according to claim 1, characterized in that: A hexagonal hole (14) is provided at the center position of the top end of the center shaft (15), and the hexagonal hole (14) penetrates into the interior of the center shaft (15).

7. The high-precision tooling for machining the inner hole of a sun gear according to claim 1, characterized in that: A limiting hole (2) is provided on a side of the top end of the V-shaped seat (8) away from the hinge shaft (7), a T-shaped bolt (3) is provided inside the limiting hole (2), and the T-shaped bolt (3) extends to the outside of the V-shaped cover (6).

8. The high-precision tooling for machining the inner hole of a sun gear according to claim 7, characterized in that: A gasket (4) is sleeved on the top end of the T-shaped bolt (3), and a nut sleeve (5) is sleeved on the top end of the T-shaped bolt (3) above the gasket (4).

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