Clamp for machining eccentric inner hole in cantilever type part

Abstract

The invention belongs to the technical field of part machining, and particularly relates to a clamp for machining an eccentric inner hole in a cantilever type part, which comprises a bottom plate, a positioning shaft, a positioning pin, and an adjusting support, a pressing support, a jacking support, a positioning support and a counterweight part which are fixedly arranged on the front surface of the bottom plate, the adjusting support, the pressing support, the jacking support and the positioning support are all provided with extrusion parts, through the arranged clamp, the cantilever type part can be firmly fixed to the lathe, safety accidents are avoided, it can be guaranteed that the rotating center of the clamp and the rotating center of a chuck are consistent in the rotating process of the lathe, and the coaxiality is guaranteed; after a counterweight is added to the clamp, action balance inspection is carried out, and it can be guaranteed that the gravity center does not shift when the clamp rotates.

Description

Technical Field

[0001] The invention belongs to the technical field of parts processing, and in particular relates to a clamp for processing an eccentric inner hole on a cantilever type part. Background Art

[0002] There is a cantilever-like part in the aircraft. According to the process requirements, the eccentric inner hole on the part is finely processed. This part belongs to the cantilever eccentric part and is part of the leading edge of the wing tip. The conventional method is to use ordinary lathe processing. There are four difficulties in using this equipment: 1. The three-jaw chuck of the lathe cannot effectively clamp and position this type of part; 2. Due to the structural characteristics of the part itself, when the part rotates with the lathe, there is distortion and deformation due to the cantilever. There is a position deviation between the inner hole of the machined part and the shape of the part, and even the part enters the plastic deformation zone. The deformation of the part cannot be eliminated after processing; 3. Even if an assembly fixture is used for fixing and clamping, the assembly fixture needs to be re-adjusted after the part is disassembled after processing, which cannot guarantee the stability of the batch production of parts. The assembly fixture is relatively bulky, and it is very troublesome to balance and adjust this type of fixture, which is inconvenient for workers to operate; 4. The processing efficiency is relatively low, and repeated clamping and alignment are required to determine the state of the part, and the state is unstable. However, the aircraft has a relatively large demand for this part and high precision requirements. The existing technology cannot meet the use requirements. Summary of the invention

[0003] To solve the problems raised in the above background technology, the present invention provides a fixture for machining eccentric inner holes on cantilever parts, which can firmly fix the cantilever parts on the lathe and ensure that the rotation centers of the fixture and chuck are consistent during the rotation of the lathe to ensure coaxiality.

[0004] To achieve the above object, the present invention provides the following technical solutions: a fixture for processing an eccentric inner hole on a cantilever part, the fixture comprising a base plate, a positioning shaft, a positioning pin, and an adjustment support, a clamping support, a top support, a positioning support and a counterweight fixedly mounted on the front of the base plate, and an extrusion part is provided on the adjustment support, the clamping support, the top support and the positioning support;

[0005] The locating shaft is fixedly connected to the base plate and clamped by a lathe chuck. The locating pin passes through the locating hole of the cantilever part and slides with the tolerance hole of the locating shaft. The cantilever part is clamped and positioned by adjusting the support, locating support, pressing support, tightening support and extrusion part in sequence.

[0006] As a preferred fixture for processing an eccentric inner hole on a cantilever part of the present invention, the extrusion part includes a bolt and a nut for limiting the rotation of the bolt, and the bolts are all connected to the inner threads of the adjustment support, the positioning support, the clamping support, and the tightening support.

[0007] As a preferred fixture for machining an eccentric inner hole on a cantilever part of the present invention, the clamping member also includes a fixing portion, the fixing portion includes a T-shaped stud and a nut, and the base plate is connected to the slide groove of the adapter disc through the T-shaped stud and the nut.

[0008] As a preferred fixture for machining an eccentric inner hole on a cantilever part of the present invention, a lifting ring is fixedly connected to the inner side of one end of the base plate.

[0009] As a preferred fixture for processing eccentric inner holes on cantilever parts of the present invention, it also includes an anti-loosening part for preventing the extrusion parts arranged opposite to each other from rotating. The anti-loosening part includes a bracket and a contact plate. Sleeves for tightening bolts under the action of elastic force are installed at both ends of the bracket, and the two sleeves move on the same axis.

[0010] As a preferred fixture for processing eccentric inner holes on cantilever parts of the present invention, a sliding rod is rotatably connected to the inner side of one end of the sleeve, and a sliding sleeve is slidably connected to the outer side of the sliding rod. An end ring portion is fixedly connected to the outer side of one end of the sliding rod located in the internal space of the sleeve, and one side surface of the end ring portion contacts the inner side surface of the sleeve. A torsion spring is fixedly connected between the inner side of one end of the end ring portion and the inner side of one end of the sleeve, and the outer side of the sliding sleeve is fixedly connected to the end of the bracket.

[0011] As a preferred fixture for machining an eccentric inner hole on a cantilever part of the present invention, an outer surface of the sleeve is fixedly provided with an outer hexagonal portion.

[0012] As a preferred fixture for machining an eccentric inner hole on a cantilever part of the present invention, the portion of the slide rod on which the slide sleeve slides is a polyhedron structure.

[0013] As a preferred embodiment of a fixture for machining an eccentric inner hole on a cantilever part of the present invention, a spring sleeved on the outside of a slide rod is fixedly connected between the slide sleeve and the end ring portion.

[0014] As a preferred fixture for processing an eccentric inner hole on a cantilever part of the present invention, a contact plate is fixedly connected to the outer side of one end of the bracket, and the contact plate is used to contact the outer surfaces of the adjustment support, the clamping support, the tightening support and the positioning support.

[0015] Compared with the prior art, the beneficial effects of the present invention are: through the provision of the clamp, the cantilevered parts can be firmly fixed on the lathe to avoid safety accidents, and the rotation centers of the clamp and the chuck can be ensured to be consistent during the rotation of the lathe to ensure coaxiality; after adding a counterweight to the clamp and performing a dynamic balance test, it can be ensured that the center of gravity of the clamp does not shift during rotation; through the provision of the extrusion part, the cantilevered parts can be quickly clamped and removed; through the provision of the anti-loosening part, the extrusion part can be prevented from loosening. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 It is a cross-sectional view of the overall structure of the present invention;

[0019] Figure 3 It is a front view and a top view of the cantilevered part of the present invention;

[0020] Figure 4 It is a three-dimensional diagram of the overall structure of the present invention;

[0021] Figure 5 A three-dimensional diagram of the back structure of the present invention as a whole;

[0022] Figure 6 It is a schematic diagram of the installation structure of the anti-loosening part in the present invention;

[0023] Figure 7 It is a schematic diagram of the overall structure of the anti-loosening part in the present invention;

[0024] Figure 8 A three-dimensional diagram of the connection structure of the sleeve in the present invention from the first perspective;

[0025] Fig. 9 A three-dimensional diagram of the connection structure of the sleeve in the present invention from a second viewing angle;

[0026] Fig.10 It is an exploded view of the connection structure of the sleeve in the present invention;

[0027] Fig.11 It is a structural schematic diagram of the open-end wrench in the present invention;

[0028] Fig.12 A schematic diagram of a transfer faceplate used in conjunction with the present invention;

[0029] In the figure:

[0030] 1. Bottom plate; 2. Positioning shaft; 3. Positioning pin; 4. Adjustment support; 5. Pressing support; 6. Pressing support; 7. Positioning support; 8. Counterweight; 9. Fixing part; 10. Lifting ring; 11. Extrusion part; 12. Cantilever parts;

[0031] 13. Anti-loosening part; 1301. Bracket; 1302. Contact plate; 1303. Sliding sleeve; 1304. Sliding rod; 1305. Limiting head; 1306. End ring; 1307. Spring; 1308. Sleeve; 1309. External hexagonal part; 1310. Circlip; 1311. Torsion spring;

[0032] 14. Open-end wrench; 15. Stop part;

[0033] 16. Adapter disc; 17. Slide groove. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] like Figure 1-Figure 12 As shown:

[0036] A fixture for machining an eccentric inner hole on a cantilever part 12, the fixture comprising a base plate 1, a positioning shaft 2, a positioning pin 3, and an adjustment support 4, a clamping support 5, a top support 6, a positioning support 7 and a counterweight 8 fixedly mounted on the front of the base plate 1, and an extrusion portion 11 is provided on the adjustment support 4, the clamping support 5, the top support 6 and the positioning support 7;

[0037] The positioning shaft 2 is slidably engaged with the tolerance hole on the bottom plate 1, and is connected by screws to form a rotating body. The positioning shaft 2 is clamped by a lathe chuck, and the positioning pin 3 passes through the positioning hole of the cantilever part 12 and is slidably engaged with the tolerance hole of the positioning shaft 2, that is, the cantilever part 12 is initially positioned by the positioning pin 3, and the cantilever part 12 is clamped and positioned by adjusting the support 4, the positioning support 7, the pressing support 5, the tightening support 6 and the extrusion part 11 in sequence;

[0038] The extrusion portion 11 includes a bolt and a nut for limiting the rotation of the bolt, and the bolts are all connected to the inner threads of the adjustment support 4 , the positioning support 7 , the pressing support 5 , and the pressing support 6 .

[0039] In this embodiment, the cantilever part 12 is placed on the fixture, and the positioning pin 3 is inserted into the inner hole of the cantilever part 12 and the inner hole of the positioning shaft 2 to ensure that the part is consistent with the fixture reference, and then the end face of the part is brought into contact with the end face of the positioning shaft 2 to achieve preliminary positioning and clamping of the part, and then the cantilever part 12 is clamped by adjusting the support 4, the positioning support 7, the pressing support 5, and the pressing support 6 in sequence. The specific operation is to rotate the bolt on the extrusion part 11 so that the bolt contacts the surface of the cantilever part 12 with a certain pressure, and then lock the bolt through the nut in the extrusion part 11, thereby limiting the rotation of the bolt and ensuring the clamping of the part during the processing;

[0040] In order to ensure that the cantilever part 12 does not deform during the clamping process, the long arm end of the cantilever part 12 is first clamped by adjusting the support 4. The cantilever part 12 is initially positioned by the locating pin 3, so that the cantilever part 12 can rotate around the locating pin 3. Therefore, the long arm end of the cantilever part 12 is fixed first, and then the short arm end of the cantilever part 12 is fixed. Even if the extrusion force applied to the cantilever part 12 by the bolts in the extrusion part 11 has a certain deviation, the deformation caused to the cantilever part 12 is also within a reasonable range and will not have much impact. According to this principle, the cantilever part 12 is clamped by the positioning support 7, the clamping support 5, and the top support 6 in turn, so that when the cantilever part 12 is clamped, the force on the cantilever part 12 is uniform.

[0041] It should be noted that the adjustment support 4 and the clamping support 5 also include an extrusion portion 11 for clamping the end of the cantilever part 12, which can further improve the stability of the clamping of the cantilever part 12. In the process of clamping the cantilever part 12 by adjusting the support 4, positioning the support 7, clamping the support 5, and the clamping support 6 in sequence, the two side surfaces of the cantilever part 12 are clamped in sequence first, and finally the two ends of the cantilever part 12 are clamped. After clamping the cantilever part 12, a dynamic balance test is required, and the balance is performed by the provided counterweight portion 8. After the cantilever part 12 is clamped, the positioning pin 3 needs to be pulled out and the inner hole of the cantilever part 12 needs to be fine-machined.

[0042] Further,

[0043] In an optional embodiment, the clamping member further includes a fixing portion 9, which includes a T-shaped stud and a nut. The base plate 1 is connected to the slide groove 17 of the adapter disc 16 via the T-shaped stud and the nut, so that the base plate 1 can be further stably installed.

[0044] In an optional embodiment, a lifting ring 10 is fixedly connected to the inner side of one end of the base plate 1 .

[0045] In this embodiment, the lifting ring 10 is provided to facilitate the disassembly and lifting of the clamp.

[0046] In an optional embodiment, it also includes an anti-loosening part 13 for preventing the oppositely arranged extrusion part 11 from rotating. The anti-loosening part 13 includes a bracket 1301 and a contact plate 1302. Sleeves 1308 for tightening bolts under the action of elastic force are installed at both ends of the bracket 1301, and the two sleeves 1308 move on the same axis.

[0047] In this embodiment, when processing the cantilever part 12, vibration may cause the bolts in the extrusion part 11 to loosen, thereby reducing the clamping force of the cantilever part 12, and even causing the risk of the cantilever part 12 falling off; the extrusion parts 11 that clamp the side of the cantilever part 12 on the adjustment support 4, the clamping support 5, the top support 6 and the positioning support 7 are symmetrically arranged, and the extrusion part 11 includes bolts. When the bolts in the symmetrically arranged extrusion parts 11 are tightened, Figure 1 From the perspective shown, the directions of tightening the bolts are opposite, therefore, the bolts in the extrusion part 11 are prevented from loosening by applying elastic force in opposite directions by the symmetrically arranged sleeves 1308 in the anti-loosening part 13. When a bolt in one of the extrusion parts 11 is loosened, the bolt will drive one of the sleeves 1308 to rotate, and the sleeve 1308 will drive the other sleeve 1308 to rotate together, but the direction of rotation of the other sleeve 1308 will further tighten the bolt in the other extrusion part 11. Therefore, no matter which extrusion part 11 the bolt is loosened, the bolt in the opposite extrusion part 11 will be tightened, so that under the action of the anti-loosening part 13, the bolts in the symmetrically arranged extrusion parts 11 will not loosen;

[0048] In order to enable the two sleeves 1308 to be sleeved on the bolts in the extrusion part 11, the two sleeves 1308 need to be able to move on the same axis. By increasing the distance between the two sleeves 1308, the sleeves 1308 can be sleeved on the bolts in the extrusion part 11, and then the distance between the two sleeves 1308 is reduced to complete the matching between the sleeves 1308 and the bolts in the extrusion part 11.

[0049] It should be noted that when the anti-loosening portion 13 is provided, the nut in the extrusion portion 11 can be omitted, and the bolt in the extrusion portion 11 can be clamped on the cantilever part 12 by relying on the elastic force of the sleeve 1308. When the cantilever part 12 is disassembled, it is only necessary to loosen one bolt in the symmetrical direction. When it is necessary to clamp the cantilever part 12 again by the bolt in the extrusion portion 11, the bolt is turned by hand to make the bolt contact with the cantilever part 12. The sleeve 1308 with elastic torsional force further provides tightening force to the bolt, thereby avoiding the problem of repeated alignment. It is convenient and fast with high stability.

[0050] In an optional embodiment, the inner side of one end of the sleeve 1308 is rotatably connected to the sliding rod 1304, the outer side of the sliding rod 1304 is slidably connected to the sliding sleeve 1303, the outer side of one end of the sliding rod 1304 located in the inner space of the sleeve 1308 is fixedly connected to the end ring part 1306, one side of the end ring part 1306 is in contact with the inner side of the sleeve 1308, a torsion spring 1311 is fixedly connected between the inner side of one end of the end ring part 1306 and the inner side of one end of the sleeve 1308, and the outer side of the sliding sleeve 1303 is fixedly connected to the end of the bracket 1301;

[0051] An outer hexagonal portion 1309 is fixedly provided on the outer surface of the sleeve 1308 .

[0052] In this embodiment, by contacting one side of the end ring portion 1306 with the inner side of the sleeve 1308 and by rotating the slide bar 1304 on the inner side of one end of the sleeve 1308, the slide bar 1304 and the sleeve 1308 can rotate stably. By setting the retaining spring 1310, the slide bar 1304 can be prevented from separating from the sleeve 1308. Before the sleeve 1308 is engaged with the bolt in the extrusion portion 11, the sleeve 1308 needs to be rotated in advance. By rotating the sleeve 1308, the sleeve 1308 can overcome the elastic force of the torsion spring 1311 when it rotates relative to the slide bar 1304, so that after the sleeve 1308 is engaged with the bolt in the extrusion portion 11, the sleeve 1308 can act on the bolt in the extrusion portion 11 with a certain elastic force, so that the bolt in the extrusion portion 11 has a certain tightening force under the action of the elastic force.

[0053] In an optional embodiment, the portion of the sliding rod 1304 on which the sliding sleeve 1303 slides is a polyhedron structure.

[0054] In this embodiment, by setting the portion of the sliding rod 1304 for the sliding sleeve 1303 to slide as a polyhedron structure, the sliding sleeve 1303 will not rotate when sliding relative to the sliding rod 1304 .

[0055] In an optional embodiment, a spring 1307 sleeved on the outside of the sliding rod 1304 is fixedly connected between the sliding sleeve 1303 and the end ring portion 1306 .

[0056] In this embodiment, by setting the spring 1307, when the sleeve 1308 cooperates with the bolt in the extrusion part 11, the sleeve 1308 will not separate from the bolt in the extrusion part 11; the outer side of the end of the sliding rod 1304 away from the end ring part 1306 is fixedly connected to the limiting head 1305, and the setting of the limiting head 1305 can prevent the sliding rod 1304 from separating from the sliding sleeve 1303.

[0057] In an optional embodiment, a contact plate 1302 is fixedly connected to the outer side of one end of the bracket 1301 , and the contact plate 1302 is used to contact the outer surfaces of the adjustment support 4 , the clamping support 5 , the pressing support 6 and the positioning support 7 .

[0058] In this embodiment: when the anti-loosening part 13 is installed, that is, when the sleeve 1308 cooperates with the bolts in the extrusion part 11, the contact plate 1302 can contact the outer surfaces of the adjustment support 4, the clamping support 5, the tightening support 6 and the positioning support 7, thereby preventing the bracket 1301 from tilting or shaking when the sleeve 1308 rotates due to the loosening of the bolts in the extrusion part 11 during the processing of the cantilever part 12. If the bracket 1301 shakes, it will affect the dynamic balance of the fixture and the cantilever part 12 as a whole. The contact part of the contact plate 1302 and the outer surfaces of the adjustment support 4, the clamping support 5, the tightening support 6 and the positioning support 7 is provided with a flexible gasket. The flexible gasket can be made of rubber or silicone, which can increase the stability of the installation and reduce the difficulty of installation.

[0059] It should also be noted that, since the force required to twist the sleeve 1308 is relatively large, and the sleeve 1308 needs to be moved along a common axis when twisting the sleeve 1308, the present invention also provides a special open-end wrench 14, and the head of the open-end wrench 14 is provided with a resisting portion 15. When the open-end wrench 14 cooperates with the external hexagonal portion 1309, the resisting portion 15 can contact the side of the external hexagonal portion 1309, thereby pushing the external hexagonal portion 1309 to drive the sleeve 1308 to move along the common axis, and finally when the sleeve 1308 is rotated, the two sleeves 1308 can be conveniently moved away from each other. It should be understood that in the above operation, two special open-end wrenches 14 need to be used at the same time.

[0060] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fixture for machining an eccentric inner hole on a cantilever part (12), characterized in that: The clamp comprises a base plate (1), a positioning shaft (2), a positioning pin (3), and an adjustment support (4), a pressing support (5), a top support (6), a positioning support (7) and a counterweight (8) fixedly mounted on the front side of the base plate (1); the adjustment support (4), the pressing support (5), the top support (6) and the positioning support (7) are all provided with an extrusion portion (11); The positioning shaft (2) is fixedly connected to the base plate (1), the positioning shaft (2) is clamped by a lathe chuck, the positioning pin (3) passes through the positioning hole of the cantilever part (12) and is slidably engaged with the tolerance hole of the positioning shaft (2), and the cantilever part (12) is clamped and positioned by successively cooperating with the adjustment support (4), the positioning support (7), the clamping support (5), the top support (6) and the extrusion part (11).

2. The fixture for machining an eccentric inner hole on a cantilevered part (12) according to claim 1, characterized in that: The extrusion portion (11) comprises a bolt and a nut for limiting the rotation of the bolt, and the bolts are all connected to the inner threads of the adjustment support (4), the positioning support (7), the pressing support (5), and the jacking support (6).

3. The fixture for machining an eccentric inner hole on a cantilevered part (12) according to claim 1, characterized in that: The clamping member also includes a fixing portion (9), which includes a T-shaped stud and a nut, and the base plate (1) is connected to the slide groove (17) of the adapter faceplate (16) via the T-shaped stud and the nut.

4. The fixture for machining an eccentric inner hole on a cantilevered part (12) according to claim 1, characterized in that: A lifting ring (10) is fixedly connected to the inner side of one end of the bottom plate (1).

5. The fixture for machining an eccentric inner hole on a cantilevered part (12) according to claim 1, characterized in that: It also includes an anti-loosening portion (13) for preventing the extrusion portion (11) arranged opposite to each other from rotating. The anti-loosening portion (13) includes a bracket (1301) and a contact plate (1302). Sleeves (1308) for tightening bolts under the action of elastic force are installed at both ends of the bracket (1301). The two sleeves (1308) move on the same axis.

6. The fixture for machining an eccentric inner hole on a cantilevered part (12) according to claim 5, characterized in that: A sliding rod (1304) is rotatably connected to the inner side of one end of the sleeve (1308), and a sliding sleeve (1303) is slidably connected to the outer side of the sliding rod (1304). An end ring (1306) is fixedly connected to the outer side of one end of the sliding rod (1304) located in the internal space of the sleeve (1308), and one side of the end ring (1306) contacts the inner side of the sleeve (1308). A torsion spring (1311) is fixedly connected between the inner side of one end of the end ring (1306) and the inner side of one end of the sleeve (1308), and the outer side of the sliding sleeve (1303) is fixedly connected to the end of the bracket (1301).

7. The fixture for machining an eccentric inner hole on a cantilevered part (12) according to claim 6, characterized in that: An outer hexagonal portion (1309) is fixedly provided on the outer surface of the sleeve (1308).

8. The fixture for machining an eccentric inner hole on a cantilevered part (12) according to claim 6, characterized in that: The portion of the sliding rod (1304) on which the sliding sleeve (1303) slides is a polyhedral structure.

9. The fixture for machining an eccentric inner hole on a cantilevered part (12) according to claim 6, characterized in that: A spring (1307) sleeved on the outside of the slide rod (1304) is fixedly connected between the slide sleeve (1303) and the end ring portion (1306).

10. The fixture for machining an eccentric inner hole on a cantilever part (12) according to claim 5, characterized in that: A contact plate (1302) is fixedly connected to the outer side of one end of the bracket (1301), and the contact plate (1302) is used to contact the outer surfaces of the adjustment support (4), the pressing support (5), the pressing support (6) and the positioning support (7).

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