Thin web gear machining clamp

Abstract

The invention discloses a thin web gear machining clamp. The thin web gear machining clamp is composed of a supporting disc, a mandrel, a positioning shaft, a pressing block, a pressing plate, an adjusting screw, a screw, a nut, a cylindrical pin and a flat washer. One face of the thin web gear is a supporting face, the other face of the thin web gear is a face to be machined, the supporting face of the thin web gear abuts against the supporting disc, the tooth portion of the thin web gear is embedded into a concave circular ring of the supporting disc, and one end of the mandrel penetrates through a center hole of the thin web gear and then is in threaded connection with a threaded hole in the center of the bottom of a concave hole of the positioning shaft. The pressing block is arranged on the to-be-machined face of the thin web gear, and the other end of the mandrel is in threaded connection with a threaded hole in the pressing block and fixed through a nut. The clamp has the beneficial effects that the supporting disc in the clamp is used for supporting the non-machining face of the gear web, and the problem of web deformation caused by poor part rigidity in the machining process of the other face of the web through a cutter can be solved.

Description

Technical Field

[0001] The invention relates to a gear processing fixture, in particular to a thin web gear processing fixture. Background Art

[0002] Currently, due to weight restrictions, most aviation parts are thin-walled structural parts. The parts have large machining allowances, low relative rigidity, and poor machining processability. Under the action of cutting force, cutting heat, and clamping force, machining deformation is prone to occur, and it is difficult to control the machining accuracy. In aviation electric mechanisms, there are many thin-web gears. In order to improve machining quality and efficiency, fixture design is required. Summary of the invention

[0003] The invention aims to solve the problem of deformation during machining of thin web gears and provides a fixture for machining thin web gears.

[0004] In order to achieve this purpose, the technical solution of the present invention is as follows: a thin web gear processing fixture, characterized in that the fixture includes: A positioning shaft, wherein the positioning shaft has two sections with different shaft diameters, namely a large diameter section and a small diameter section, wherein a concave hole is opened inwardly at the middle of the end surface of the large diameter section, a threaded hole is processed at the center of the bottom of the concave hole, and a plurality of stepped holes and a pin hole are evenly arranged along the circumferential direction on the end surface of the large diameter section; The support disc has a large flat surface on one side and a circular groove matched with the end face of the large diameter section of the positioning shaft in the center of the other side, so that the end face of the large diameter section of the positioning shaft can be contained in the circular groove of the support disc, and an axial through hole is provided in the circular groove, and the axial through hole passes through the large flat surface side of the support disc, the end face of the large diameter section of the positioning shaft abuts against the bottom of the groove of the support disc, and the central through hole of the support disc is aligned with the concave hole on the end face of the large diameter section of the positioning shaft; a plurality of first threaded holes are evenly arranged in the circular groove of the support disc along the circumferential direction, and a pin hole is also arranged on the same circumference of the threaded hole of the concave hole of the support disc, the large flat surface of the support disc is provided with a concave ring, and a second threaded hole is machined in the concave ring, the width of the concave ring matches the distance from the upper end of the web of the thin web gear to the tooth top, and a plurality of countersunk holes are evenly arranged in the circumferential direction of the large flat surface of the support disc, and a third threaded hole is arranged in the center of the countersunk hole; A pressure plate, which cooperates with the countersunk hole of the large plane of the supporting disc and is located outside the thin web gear to fix the outer edge of the thin web gear; A pressing block, which is cylindrical on the outside and has a threaded hole on the inside; A mandrel having a middle smooth shaft end and threaded sections at both ends; One side of the thin-web gear is a supporting surface, and the other side is a surface to be processed. The supporting surface of the thin-web gear is against the supporting disc, and the protruding part of the thin-web gear teeth is embedded in the concave ring of the supporting disc. One end of the core shaft passes through the center hole of the thin-web gear and is threadedly connected with the threaded hole at the center of the bottom of the positioning shaft concave hole. The pressure block is placed on the surface to be processed of the thin-web gear, and the other end of the core shaft is threadedly connected with the internal threaded hole of the pressure block and fixed by a nut.

[0005] As a preferred solution for the thin-web gear processing fixture, six first threaded holes are evenly arranged along the circumference of the support disc, and the angle between the line from the center of the pin hole to the center of the support disc and the line from the center of one of the six first threaded holes to the center of the support disc is 15°.

[0006] As a preferred solution for the thin web gear machining fixture, the positions of the stepped hole and the pin hole on the positioning shaft correspond to the positions of the threaded hole and the pin hole on the supporting disc, and are connected by the screws and cylindrical pins.

[0007] As a preferred solution for the thin-web gear processing fixture, four threaded holes are processed in the concave ring on the large flat side of the supporting disc. The width of the concave disc can accommodate the part from the upper end of the web to the tooth top of the thin-web gear. The minor diameter of the concave ring of the supporting disc is smaller than the diameter of the gear web, so that the processed gear B surface can be close to the large flat side of the supporting ring.

[0008] As a preferred solution for the thin-web gear processing fixture, an adjusting screw is installed in the second threaded hole in the concave ring of the support disk. The adjusting screw is screwed into the depth so that the end face of the adjusting screw abuts against the end face of the gear tooth above the web of the thin-web gear, and the axial position of the adjusting screw is fixed by the nut.

[0009] As a preferred solution for the thin web gear machining fixture, the pressing block is a cylinder, and three-stage stepped holes are arranged inside the pressing block, and the smallest stepped hole is a threaded hole.

[0010] As a preferred solution for the thin-web gear processing fixture, the pressure plate has a cylindrical section with the same diameter as the countersunk hole of the supporting disc and a protruding end with a flat surface. The cylindrical section of the pressure plate is contained in the countersunk hole of the supporting disc. The flat end of the protruding end of the pressure plate abuts against the gear and is fixed by the screws, nuts and flat washers. The number of the pressure plates is 4.

[0011] Compared with the prior art, the beneficial effect of the present invention is at least that: when processing thin-web gears, the web of the gear B side is first processed, and then the processed gear is clamped according to the above scheme, the machine tool soft jaws clamp the positioning shaft minor diameter, and when turning the gear A side web, the web stiffness can be enhanced and deformation caused by insufficient stiffness can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the present invention.

[0013] Figure 2 is a side view of the support disc.

[0014] The figure includes: a positioning shaft 1, a stepped hole 11, a threaded hole 12, a concave hole 13, a pin hole 14, a supporting disc 2, a concave ring 21, a second threaded hole 22, a countersunk hole 23, a third threaded hole 24, a circular groove 25, a first threaded hole 26, a pin hole 27, a pressure plate 3, a cylindrical section 31, a protruding end 32, a flat washer 4, a screw 5, an adjusting screw 6, a nut 7, a pressure block 8, a core shaft 9, a first threaded section 91, an optical axis end 92, a second threaded section 93, and a cylindrical pin 10. DETAILED DESCRIPTION

[0015] The present invention is further described in detail below by means of specific embodiments connected with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0016] See also Figure 1 , the figure shows a thin web gear processing fixture, which can be used for processing the thin web of the gear.

[0017] The processing fixture is composed of a positioning shaft 1, a supporting disc 2, a pressing plate 3, a flat washer 4, a screw 5, an adjusting screw 6, a nut 7, a pressing block 8, a core shaft 9, and a cylindrical pin 10.

[0018] The positioning shaft 1 has two shaft sections with different diameters. Six stepped holes 11 and one pin hole 14 are evenly arranged on the large diameter circumference of the positioning shaft 1. A concave hole 13 is formed inwardly on the large end surface, and a threaded hole 12 is formed in the center of the concave hole.

[0019] The support disc 2 has a large flat surface on one side and a circular groove 25 formed on the other side. The diameter of the circular groove 25 is equal to the major diameter of the positioning shaft. The major diameter of the positioning shaft 1 is contained in the circular groove 25 of the support disc 2. The large flat surface of the support disc 2 is processed with a concave circular ring 21. Four second threaded holes 22 are evenly processed in the concave circular ring 21. Four countersunk holes 23 are evenly arranged on the large flat surface of the support disc, and a third threaded hole 24 is arranged in the center of the countersunk hole. The large end surface of the positioning shaft 1 is against the bottom plane of the circular groove 25 of the support disc 2. The circular groove 25 is evenly arranged with first threaded holes 26 and a pin hole 27. The number of threaded holes is 6. The first threaded hole 26 and the pin hole 27 are on the same circumference. The angle between the center of the pin hole 27 and the center of the support disc and the center of a threaded hole among the 6 first threaded holes and the center of the support disc is 30°. The first threaded hole 26 and the pin hole 27 correspond one-to-one to the threaded hole 12 and the pin hole 14 of the positioning shaft 1 .

[0020] The pressure plate 3 has a cylindrical section 31 and a protruding end 32. There are four pressure plates. The diameter of the pressure plate cylindrical section 31 is equal to the diameter of the countersunk hole 23 on the large flat side of the support disc. The pressure plate cylindrical section 31 is contained in the support disc countersunk hole 32. The inner side of the pressure plate protruding end 32 is a plane, which abuts against the end face of the thin web gear.

[0021] The pressing block 8 is cylindrical on the outside and has stepped holes 81 , 82 , 83 formed on the inside. The stepped hole 83 is a threaded hole.

[0022] The core shaft 9 has a middle optical axis end 92 and two end threaded sections (a first threaded section 91 and a second threaded section 93 ). The second threaded section 93 is screwed into the threaded hole 12 of the positioning shaft 1 , and the first threaded section 91 is screwed into the threaded hole 83 of the pressing block 8 .

[0023] The use process of the thin-web gear processing fixture is as follows: the large diameter end of the positioning shaft 1 is installed in the circular groove 25 of the supporting disc 2, the end face of the large diameter end of the positioning shaft is abutted against the bottom of the circular groove 25 of the supporting disc, and the positioning shaft 1 is fixed to the supporting disc 2 using screws 4 and cylindrical pins 10. The mandrel 9 is inserted into the hole of the thin web gear, the machined web surface B of the thin web gear is against the large plane of the support disc 2, the cylindrical end 31 of the pressure plate 3 is contained in the countersunk hole 23 of the support disc 2, the protruding end 32 plane of the pressure plate 3 is against the end face of the gear teeth of the thin web gear, and the thin web gear is fixed to the support disc 2 by the screw and the flat washer, the annular surface of the pressure block 8 is against the end face of the thin web gear, the second threaded section 93 of the mandrel 9 is screwed into the threaded hole 12 of the positioning shaft 1, the first threaded section 91 of the mandrel 9 is screwed into the threaded hole 83 of the pressure block 8, and the thin web gear is clamped by the nut 7. The soft jaws of the machine tool clamp the minor diameter of the positioning shaft, and when turning the web of the gear A surface, the B surface is against the large plane of the support disc 2, which can improve the rigidity and effectively reduce the deformation during the processing.

[0024] The above only expresses the implementation mode of the present invention, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A thin web gear machining fixture, Features The clamp comprises: A positioning shaft, wherein the positioning shaft has two sections with different shaft diameters, namely a large diameter section and a small diameter section, wherein a concave hole is opened inwardly at the middle of the end surface of the large diameter section, a threaded hole is processed at the center of the bottom of the concave hole, and a plurality of stepped holes and a pin hole are evenly arranged along the circumferential direction on the end surface of the large diameter section; The support disc has a large flat surface on one side and a circular groove matched with the end face of the large diameter section of the positioning shaft in the center of the other side, so that the end face of the large diameter section of the positioning shaft can be contained in the circular groove of the support disc, and an axial through hole is provided in the circular groove, and the axial through hole passes through the large flat surface side of the support disc, the end face of the large diameter section of the positioning shaft abuts against the bottom of the groove of the support disc, and the central through hole of the support disc is aligned with the concave hole on the end face of the large diameter section of the positioning shaft; a plurality of first threaded holes are evenly arranged in the circular groove of the support disc along the circumferential direction, and a pin hole is also arranged on the same circumference of the threaded hole of the concave hole of the support disc, the large flat surface of the support disc is provided with a concave ring, and a second threaded hole is machined in the concave ring, the width of the concave ring matches the distance from the upper end of the web of the thin web gear to the tooth top, and a plurality of countersunk holes are evenly arranged in the circumferential direction of the large flat surface of the support disc, and a third threaded hole is arranged in the center of the countersunk hole; A pressure plate, which cooperates with the countersunk hole of the large plane of the supporting disc and is located outside the thin web gear to fix the outer edge of the thin web gear; A pressing block, which is cylindrical on the outside and has a threaded hole on the inside; A mandrel having a middle smooth shaft end and threaded sections at both ends; One side of the thin-web gear is a supporting surface, and the other side is a surface to be processed. The supporting surface of the thin-web gear is against the supporting disc, and the tooth portion of the thin-web gear is embedded in the concave ring of the supporting disc. One end of the core shaft passes through the center hole of the thin-web gear and is threadedly connected to the threaded hole at the center of the bottom of the concave hole of the positioning shaft. The pressure block is placed on the surface to be processed of the thin-web gear, and the other end of the core shaft is threadedly connected to the internal threaded hole of the pressure block and fixed by a nut.

2. The thin web gear machining fixture according to claim 1, It is characterized in that Six first threaded holes are evenly arranged along the circumference of the support disc, and the angle between the line from the center of the pin hole to the center of the support disc and the line from the center of one of the six first threaded holes to the center of the support disc is 15°.

3. The thin web gear machining fixture according to claim 1, It is characterized in that, The positions of the stepped hole and the pin hole on the positioning shaft correspond to the positions of the threaded hole and the pin hole on the supporting disc, and are connected by means of the screw and the cylindrical pin.

4. The thin web gear machining fixture according to claim 1, It is characterized in that The second threaded hole in the concave ring of the support disc is used to install an adjusting screw. The adjusting screw is screwed into the depth so that the end face of the adjusting screw abuts against the end face of the gear teeth above the web of the thin web gear, and the nut is used to fix the axial position of the adjusting screw.

5. The thin web gear machining fixture according to claim 1, It is characterized in that The pressing block is a cylinder, and three stepped holes are arranged inside the pressing block, and the smallest stepped hole is a threaded hole.

6. The thin web gear machining fixture according to claim 1, It is characterized in that The pressure plate has a cylindrical section with the same diameter as the countersunk hole of the support disc and a protruding end with a plane. The cylindrical section of the pressure plate is contained in the countersunk hole of the support disc. The flat end of the protruding end of the pressure plate abuts against the gear and is fixed by the screws, nuts and flat washers. There are 4 pressure plates.

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