Clamp for electric spark machining of end face inclined hole, communicated with closed cavity, of oil supply ring

Abstract

The utility model discloses a clamp for electric spark machining of an end face inclined hole, communicated with a closed cavity, of an oil supply ring and belongs to the technical field of aero-engine part machining. The bottom plate is connected with the rib plate, the rib plate is connected with the upper plate, the upper plate is connected with the supporting sleeve and the feeler block, and the supporting sleeve is used for installing a workpiece to be machined; a first threaded hole is formed in the middle of the upper plate, a through hole is formed in the middle of the supporting sleeve, the threaded pin penetrates through the through hole and then is screwed into the first threaded hole, a lower nut is arranged outside the threaded pin, arranged in the through hole and attached to the upper plate, a pressing plate and an upper nut are arranged on the outer side of the threaded pin, the pressing plate is in sliding connection with the threaded pin, and the upper nut is in threaded connection with the threaded pin. The inclined upper plate ensures natural straightening of an inclined hole and can be directly used for electrode machining, and machining precision is ensured; the tool setting block achieves rapid and accurate positioning of the position of a machining hole, and tool setting does not need to be conducted again after the machining position is replaced. And meanwhile, the to-be-machined part is manually rotated, and the insertion rod is utilized, so that multiple holes are machined in sequence easily.

Description

Technical Field

[0001] This utility model relates to a fixture for EDM machining of an oblique hole on the end face of an oil supply ring that communicates with a sealed cavity, belonging to the field of aero-engine parts machining technology. Background Technology

[0002] For oil supply rings with oblique holes on the end face communicating with a sealed cavity, the oblique holes must be machined after the component is formed to ensure the accuracy of the flow rate and angular position of the holes. Traditional machining centers using cutting tools generate a large number of burrs and excess material when machining these oblique holes. These impurities easily enter the sealed cavity of the oil supply ring, making subsequent cleaning extremely difficult and potentially impossible to completely remove, thus affecting the performance and reliability of the oil supply ring. Furthermore, considering the component's size limitations, traditional rotary table machining methods also encounter many inconveniences during rotation. This not only increases the machining difficulty but also reduces production efficiency.

[0003] To address these issues, the industry has begun exploring the use of electrical discharge machining (EDM) for machining oblique holes. EDM, with its high precision and non-contact machining characteristics, theoretically can effectively avoid the burrs and foreign matter problems caused by tool machining. However, existing EDM fixtures have many design shortcomings, limiting their application in machining oblique holes for oil supply rings.

[0004] First, the existing fixture is too large and has a low compatibility with the worktable, directly affecting machining accuracy and efficiency. Second, the existing fixture lacks an angular pin design, making it impossible to machine the workpiece in four directions. This limits the fixture's versatility and flexibility, increasing machining costs and time. Third, the existing fixture lacks a tool setting block, making precise workpiece positioning impossible. This may lead to increased machining errors, affecting the flow rate and angular position accuracy of the inclined holes. Furthermore, the existing fixture lacks an angled ramp design, making the machining of inclined holes difficult. The fixture design should be able to accommodate the inclination angle of the inclined holes to ensure smooth machining. Finally, the existing fixture's clamping method does not adequately consider the clearance of the hole diameter. During machining, the pressure plate needs to be constantly adjusted to maintain the clamping state, which not only increases operational complexity but also extends the machining cycle.

[0005] In summary, existing EDM fixtures have many shortcomings in machining inclined holes for oil supply rings and urgently need improvement and optimization. Utility Model Content

[0006] To address the problems existing in the background art, this utility model provides a fixture for EDM machining of an inclined hole on the end face of an oil supply ring that communicates with a sealed cavity.

[0007] To achieve the above objectives, this utility model adopts the following technical solution: a fixture for EDM of an oil supply ring with an oblique hole on its end face communicating with a sealed cavity, comprising a base plate, ribs, an upper plate, a support sleeve, a tool setting block, a pressure plate, a lower nut, an upper nut, and a threaded pin; the upper end of the base plate is fixedly connected to the lower end of two vertical ribs, and the upper ends of the two ribs are fixedly connected to the inclined upper plate; the upper end of the upper plate is fixedly connected to the lower end of the support sleeve, and the upper end of the support sleeve is used to install the workpiece to be processed; a threaded hole is provided in the middle of the upper plate, and a through hole is provided in the middle of the support sleeve; the lower end of the threaded pin passes through the through hole and is screwed into the threaded hole; a lower nut is screwed onto the outer side of the threaded pin; the lower nut is set in the through hole and fits against the upper surface of the upper plate; a pressure plate and an upper nut are sequentially fitted onto the outer side of the upper end of the threaded pin from bottom to top; the pressure plate is slidably connected to the threaded pin; and the upper nut is threadedly connected to the threaded pin; the upper end face of the upper plate is fixedly connected to the tool setting block.

[0008] The upper plate has a countersunk hole in the middle of its upper surface. The lower end of the support sleeve is inserted into the countersunk hole. The bottom surface of the countersunk hole and the lower end of the support sleeve are provided with pin holes and multiple threaded holes. The support sleeve and the upper plate are angularly limited by inserting pins into the corresponding pin holes. The support sleeve and the upper plate are connected and fixed by screwing screws into the corresponding threaded holes.

[0009] A washer is provided between the pressure plate and the upper nut.

[0010] The tool setting block includes an integrally formed mounting part and a tool setting part. The lower end of the mounting part is vertically fixedly connected to the upper plate. The tool setting part is vertically arranged, and one side of the tool setting part is provided with an X-direction tool setting surface and a Y-direction tool setting surface.

[0011] The upper surface of the support sleeve is provided with a placement groove, which is matched and inserted into the lower end of the workpiece to be processed. The upper end of the outer wall of the support sleeve is provided with a circumferential protrusion, which is provided with a plurality of angular pin holes that correspond one-to-one with the angular holes of the workpiece to be processed. The support sleeve and the workpiece to be processed are positioned and connected by inserting a rod into the corresponding angular holes and angular pin holes.

[0012] The circumferential protrusion has multiple threaded holes 3 that are connected to the angular pin holes one by one, and each of the threaded holes 3 is screwed into a screw.

[0013] The pressure plate includes an integrally formed inner circular portion and an outer square portion. The outer wall of the inner circular portion is fitted to the upper end of the inner wall of the workpiece to be processed. The outer square portion is square, and the four corners of the outer square portion are fitted to the upper end face of the workpiece to be processed. There is a clearance space between the four sides of the outer square portion and the upper end face of the workpiece to be processed.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] The inclined upper plate of this invention ensures the natural alignment of the inclined holes, allowing direct application in electrode machining and ensuring machining accuracy. The tool setting block enables rapid and precise positioning of the machined holes, eliminating the need for re-setting the tool after changing machining positions. Furthermore, by manually rotating the workpiece and using a guide bar, sequential machining of multiple holes can be easily completed. This invention improves machining accuracy and efficiency, offers flexible use, reduces maintenance costs, and has broad application prospects. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 yes Figure 1 AA section view;

[0018] Figure 3 This is a schematic diagram of the tool block structure. Detailed Implementation

[0019] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.

[0020] A fixture for EDM machining an inclined hole on the end face of an oil supply ring communicating with a sealed cavity includes a base plate 1, stiffeners 2, an upper plate 3, a support sleeve 6, a tool setting block 7, a pressure plate 12, a lower nut 13, an upper nut 15, and a threaded pin 16. The upper end of the base plate 1 is fixedly connected to the lower ends of two vertically arranged and parallel stiffeners 2 by welding. The upper ends of both stiffeners 2 are fixedly connected to the inclined upper plate 3 by welding. The inclination angle of the upper plate 3 is determined according to the inclination angle of the inclined hole, that is, after the workpiece 9 is installed on the upper plate 3, it is necessary to ensure that the inclined hole is in a vertical state. The two stiffeners 2 are symmetrically arranged according to the mid-section of the machining reference diameter. The upper end of the upper plate 3 is fixedly connected to the lower end of the support sleeve 6. The upper end of the support sleeve 6 is used to install the workpiece 9 to be processed. The upper plate 3 has a threaded hole in the middle, and the support sleeve 6 has a through hole in the middle. The lower end of the threaded pin 16 passes through the through hole and is screwed into the threaded hole. A lower nut 13 is screwed onto the outer side of the threaded pin 16. The lower nut 13 is set in the through hole and fits against the upper surface of the upper plate 3. The lower nut 13 locks the threaded pin 16. The through hole reduces weight and facilitates the passage of the threaded pin 16. The outer side of the upper end of the threaded pin 16 is fitted with a pressure plate 12 and an upper nut 15 from bottom to top. The pressure plate 12 is slidably connected to the threaded pin 16, and the upper nut 15 is threadedly connected to the threaded pin 16. The upper end face of the upper plate 3 is fixedly connected to the tool setting block 7 by corresponding bolts and positioning pins.

[0021] The upper plate 3 has a countersunk hole in the middle of its upper surface. The lower end of the support sleeve 6 is inserted into the countersunk hole. The countersunk hole is used for centering the support sleeve 6. The bottom surface of the countersunk hole and the lower end of the support sleeve 6 are provided with pin holes and multiple threaded holes. The support sleeve 6 and the upper plate 3 are angularly limited by inserting pins into the corresponding pin holes. The support sleeve 6 and the upper plate 3 are connected and fixed by screwing screws into the corresponding threaded holes.

[0022] A washer 14 is provided between the pressure plate 12 and the upper nut 15. The washer 14 serves as a protective and pre-tightening function.

[0023] The tool setting block 7 includes an integrally formed mounting part 4 and a tool setting part 5. The lower end of the mounting part 4 is vertically fixedly connected to the upper plate 3. The tool setting part 5 is vertically arranged, and one side of the tool setting part 5 is provided with an X-direction tool setting surface 8 and a Y-direction tool setting surface 17, which facilitates the control of the two XY direction coordinates.

[0024] The upper surface of the support sleeve 6 is provided with a placement groove, the depth of which matches the reference diameter of the part. The placement groove is matched and inserted into the lower end of the workpiece 9 to be processed. The upper end of the outer wall of the support sleeve 6 is provided with a circumferential protrusion. The circumferential protrusion is provided with a plurality of angular pin holes along its circumference that correspond one-to-one with the angular holes of the workpiece 9 to be processed. The support sleeve 6 and the workpiece 9 to be processed are positioned and connected by inserting the insert rod 11 into the corresponding angular holes and angular pin holes.

[0025] The circumferentially protruding sidewall is provided with a plurality of threaded holes 3 that are connected to the angular pin holes one by one along its circumference. Each of the threaded holes 3 is screwed with a screw 10, which is used to fix the insert rod 11.

[0026] The pressure plate 12 includes an integrally formed inner circular portion and an outer square portion. The outer wall of the inner circular portion is fitted to the upper end of the inner wall of the workpiece 9 to achieve full contact with the workpiece 9. The outer square portion is square, and the four corners of the outer square portion are fitted to the upper end face of the workpiece 9. There is a clearance space between the four sides of the outer square portion and the upper end face of the workpiece 9. The clearance space facilitates the processing of oblique holes. The base plate 1, the stiffening plate 2, and the pressure plate 12 are all provided with weight reduction holes for weight reduction.

[0027] The pressure plate 12 is made of soft material, which effectively protects the appearance of the parts.

[0028] The present invention relates to a method for using a fixture for EDM machining of an oil supply ring with an oblique hole on its end face communicating with a sealed cavity. The method includes the following steps:

[0029] S1: Install and fix the base plate 1 on the workbench of the EDM equipment. At the same time, the outer boundary of the base plate 1 can be used for the alignment fixture.

[0030] S2: Install support sleeve 6;

[0031] S3: Screw the threaded pin 16 into the threaded hole 2 and lock it with the lower nut 13;

[0032] S4: Place the workpiece 9 to be processed into the placement slot of the support sleeve 6 and fix it with the insert rod 11 and screw 10;

[0033] S5: Press the pressure plate 12 onto the workpiece 9 and tighten the upper nut 15;

[0034] S6: After installing the electrode holder and electrode wire, use the electrode to set the tool. The machining position of a hole can be found by using the X and Y values.

[0035] S7: Perform hole machining on the machining position described in S6;

[0036] S8: After removing the insert rod 11, loosening the upper nut 15 and manually rotating the workpiece 9 to be processed, insert the insert rod 11 again into the corresponding angular hole and angular pin hole after rotation to achieve the switching of the processing position of the next hole;

[0037] S9: Perform hole machining on the machining position described in S8;

[0038] S10: Repeat S8-S9 until all holes are machined.

[0039] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of the equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0040] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An end face inclined hole jig for electrical discharge machining of an oil supply ring communicating with a closed chamber, characterized by: The utility model provides a kind of machining device for machining workpiece, including bottom plate (1), web plate (2), upper plate (3), support sleeve (6), tool rest (7), pressing plate (12), lower nut (13), upper nut (15) and threaded pin (16);The upper end of the bottom plate (1) is fixedly connected with the lower end of two vertical web plates (2), the upper end of two web plates (2) is fixedly connected with the upper plate (3) arranged obliquely, the upper end of the upper plate (3) is limit fixedly connected with the lower end of support sleeve (6), and the upper end of support sleeve (6) is used to install workpiece (9) to be processed;The middle part of upper plate (3) is provided with threaded hole one, and the middle part of support sleeve (6) is provided with through hole, the lower end of threaded pin (16) is rotated into threaded hole one after passing through through hole, lower nut (13) is rotatably connected to the outside of threaded pin (16), and lower nut (13) is arranged in through hole and is arranged in contact with the upper surface of upper plate (3), the outside of the upper end of threaded pin (16) is sequentially sleeved with pressing plate (12) and upper nut (15) from bottom to top, pressing plate (12) is slidably connected with threaded pin (16), and upper nut (15) is threadedly connected with threaded pin (16);The upper end surface of upper plate (3) is fixedly connected with tool rest (7).

2. The fixture for electrical discharge machining of an inclined hole in an end surface of an oil supply ring communicating with a closed chamber according to claim 1, characterized in that: The middle part of the upper surface of the upper plate (3) is provided with a countersunk hole, the lower end of the support sleeve (6) is matchedly inserted into the countersunk hole, and the hole bottom surface of the countersunk hole and the lower end of the support sleeve (6) are correspondingly provided with a pin hole and a plurality of threaded holes two, the support sleeve (6) and the upper plate (3) are angularly limited by inserting the pin into the corresponding pin hole, and the support sleeve (6) and the upper plate (3) are connected and fixed by rotating the screw into the corresponding threaded hole two.

3. The fixture for electrical discharge machining of an inclined hole in an end surface of an oil supply ring communicating with a closed chamber according to claim 1, characterized in that: A washer (14) is arranged between the pressing plate (12) and the upper nut (15).

4. The jig for electrical discharge machining of an inclined hole in an end surface of an oil supply ring communicating with a closed chamber according to claim 2 or 3, characterized in that: The tool rest (7) comprises an integrated mounting portion (4) and a tool setting portion (5), the lower end of the mounting portion (4) is perpendicularly fixedly connected with the upper plate (3), and the tool setting portion (5) is vertically arranged, one side of the tool setting portion (5) is provided with an X-direction tool setting surface (8) and a Y-direction tool setting surface (17).

5. The fixture for electrical discharge machining of an inclined hole in an end surface of an oil supply ring communicating with a closed chamber according to claim 1, characterized in that: The upper surface of the support sleeve (6) is provided with a placing groove, the placing groove is matchedly inserted with the lower end of the workpiece (9) to be processed, the upper end of the outer wall of the support sleeve (6) is provided with a circumferential protrusion, the circumferential protrusion is provided with a plurality of angular pin holes corresponding to the angular holes one of the workpiece (9), and the support sleeve (6) and the workpiece (9) are positioned and connected by inserting the plug (11) into the corresponding angular hole and angular pin hole.

6. The fixture for electrical discharge machining of an inclined hole in an end surface of an oil supply ring communicating with a closed chamber according to claim 5, characterized in that: The side wall of the circumferential protrusion is provided with a plurality of threaded holes three corresponding to the angular pin holes, and each threaded hole three is rotatably connected with a screw (10).

7. The fixture for electrical discharge machining of an inclined hole in an end surface of an oil supply ring communicating with a closed chamber according to claim 1, characterized in that: The pressing plate (12) comprises an integrated inner circular portion and an outer square portion, the outer wall of the inner circular portion is arranged in contact with the upper end of the inner wall of the workpiece (9), the outer square portion is a square, the four corner portions of the outer square portion are in contact with the upper end surface of the workpiece (9), and there is a clearance space between the four edge portions of the outer square portion and the upper end surface of the workpiece (9).

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