Drilling clamp and clamping method for center hole of sheet type single-mounting-plate blade

Abstract

The invention relates to the technical field of aero-engine blade machining, in particular to a drilling clamp for a center hole of a sheet type single mounting plate blade and a clamping method. The drilling clamp comprises a clamp bottom plate, a chuck seat and a side plate, wherein the chuck seat and the side plate are installed on the top face of the bottom plate. U-shaped seats are arranged right above the chuck seat at intervals, and first side arms of the U-shaped seats are fixedly connected with the upper parts of the side plates; a positioning block, a supporting block and a positioning pin are arranged on the top surface of the chuck seat; a sliding groove is formed in the front face side of the chuck base, and a pressing plate is installed in the sliding groove. A locking screw is screwed on the pressing plate, and the locking screw is screwed on the groove bottom of the sliding groove; the supporting block is positioned between the positioning block and the pressing plate; a first fastening screw and a second fastening screw are respectively screwed on a first side arm and a second side arm of the U-shaped seat; a first fastening screw penetrates through the side plate and then is in threaded fit with a first side arm of the U-shaped seat; the first set screw and the second set screw are coaxially arranged, and the abutting ends of the first set screw and the second set screw are oppositely arranged.

Description

Technical Field

[0001] The invention relates to the technical field of aircraft engine blade processing, and in particular to a drilling fixture and a clamping method for a central hole of a thin-sheet single-mounting plate blade. Background Art

[0002] Aircraft engine blades have very high requirements for processing equipment, processing methods, and processing accuracy, so they are required to be accurately positioned and clamped stably during the processing. Single-mounting plate blades belong to aircraft engine rectifier blades. Their structural features are composed of mounting plates and blade body profiles. For the processing of the blade body, the center hole on the process journal is used for positioning. Therefore, the processing accuracy of the center hole on the process journal will directly affect the processing quality of the blade body profile, and even cause the entire blade to be scrapped.

[0003] The processing of drilling the center hole on the process journal is usually carried out by a radial drilling machine or a drilling and tapping center, and the blade mounting plate is used for positioning and clamping. However, since the mounting plate is a thin sheet type with a thickness of less than 1mm, it is difficult to ensure accurate positioning and stable clamping during positioning and clamping. There is also a positioning and clamping method by casting alloy blocks, but this processing scheme will cause the reference conversion error caused by the inconsistent reference during the blade body processing, thereby affecting the blade body processing quality. Therefore, it is necessary to provide a drilling fixture and clamping method for the center hole of a thin single mounting plate blade to solve the problem of difficulty in clamping when drilling a thin single mounting plate blade. Summary of the invention

[0004] The main purpose of the present invention is to provide a drilling fixture and a clamping method for the center hole of a thin-sheet single mounting plate blade, aiming to solve the above-mentioned technical problems.

[0005] To achieve the above-mentioned purpose, on the one hand, the present invention proposes a drilling fixture for the center hole of a thin-film single-mounting plate blade, comprising a fixture base plate, a chuck seat and a side plate installed on the top surface of the base plate; a U-shaped seat is arranged at intervals directly above the chuck seat, and the first side arm of the U-shaped seat is fastened and connected to the upper part of the side plate; a positioning block, a supporting block and a positioning pin are arranged on the top surface of the chuck seat; a slide groove is arranged on the front side of the chuck seat, and a pressure plate is installed in the slide groove; a locking screw is screwed on the pressure plate, and the locking screw is screwed on the bottom of the slide groove; the supporting block is located between the positioning block and the pressure plate, and the top surfaces of the positioning block and the pressure plate are higher than the top profile of the supporting block; a first fixing screw and a second fixing screw are screwed on the first side arm and the second side arm of the U-shaped seat respectively; the first fixing screw passes through the side plate and is threadedly matched with the first side arm of the U-shaped seat; the first fixing screw and the second fixing screw are coaxially arranged, and the top tightening ends of the two are arranged oppositely.

[0006] Preferably, a recessed groove is provided on the top of the support block, and the recessed groove is used to accommodate the tenon of the single mounting plate blade.

[0007] Preferably, bosses are integrally formed on both sides of the bottom of the side plate; bolt holes are provided on the bosses, and the bosses are bolted to the fixture bottom plate.

[0008] Preferably, a vertical surface on the positioning block close to the supporting block is set as a positioning surface; and a vertical groove penetrating up and down is set on the positioning surface.

[0009] Preferably, both the first set screw and the second set screw are M8 knurled cylindrical head set screws.

[0010] Preferably, the chuck seat and the fixture base plate are connected and assembled from the bottom by screws.

[0011] Preferably, the single-side gap between the groove walls on both sides of the slide groove and the pressure plate is no more than 0.05 mm.

[0012] Preferably, the top surface of the support block is an arc surface, and the arc surface matches the shape of the outer arc surface of the edge plate of the single mounting plate blade.

[0013] On the other hand, the present invention also provides a method for drilling and clamping a center hole of a thin-sheet single mounting plate blade, using the above-mentioned drilling fixture, comprising the following steps:

[0014] Step S1, vertically placing the single mounting plate blade to be processed on the top surface of the support block, so that the blade body of the single mounting plate blade faces upward, and the outer arc surface of the edge plate of the single mounting plate blade abuts against the top surface of the support block, and determining the position of the single mounting plate blade in the z direction;

[0015] Step S2, adjusting the position of the single mounting plate blade so that the edge plate end surface of the single mounting plate blade contacts the positioning pin to determine the position of the single mounting plate blade in the y direction; and at the same time, making the side surface of the edge plate blade basin contact the positioning block to determine the position of the single mounting plate blade in the x direction;

[0016] Step S3, tighten the locking screw to drive the pressing plate to move in the slide groove along the negative direction of the x-axis and press against the side surface of the back side of the edge plate blade of the single mounting plate blade;

[0017] Step S4, rotating the first set screw and the second set screw, so that the end surfaces of the first set screw and the second set screw's top tightening ends are respectively in contact with the shaft neck portion of the single mounting plate blade.

[0018] Furthermore, in the step S4, the end faces of the tightening ends of the first set screw and the second set screw are only in contact with the shaft neck portion of the single mounting plate blade, and no tightening force exists.

[0019] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0020] (1) By adopting the drilling fixture and clamping method provided by the present invention, the clamping and positioning of the thin-sheet single mounting plate blade is achieved, the clamping is reliable, and it is conducive to drilling the center hole of the process journal.

[0021] (2) By using the drilling fixture provided by the present invention, when clamping a thin-sheet single-mounting plate blade, the end faces of the first set screw and the second set screw only contact the axial neck of the single-mounting plate blade, and there is no tightening force. Therefore, the positioning and clamping of the blade edge plate will not be damaged, and only the blade vibration caused by the cutting force during the center hole drilling process will be offset, protecting the positioning and clamping of the blade edge plate, so that the position of the blade is accurate and stable during the center hole drilling process.

[0022] (3) By adopting the drilling fixture and clamping method provided by the present invention, the problem of reference conversion error caused by inconsistent references during the subsequent CNC milling of the blade body can be effectively avoided, and processing quality accidents caused by inaccurate positioning and clamping of the thin-film type mounting plate during center hole drilling can be avoided. The processing quality of the center hole drilling of the thin-film single mounting plate blade is improved, the probability of reworking the center hole drilling in the subsequent process is reduced, and the manpower and material costs are greatly saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0024] Figure 1 A schematic diagram of the structure of the drilling fixture provided by the present invention;

[0025] Figure 2 This is a schematic diagram of the drilling fixture provided by the present invention after clamping a single mounting plate blade.

[0026] Explanation of the accompanying drawings: 1. Clamp base plate; 2. Chuck seat; 2a. Slide groove; 3. Side plate; 3a. Boss; 4. Positioning block; 4a. Positioning surface; 4b. Vertical groove; 5. First set screw; 6. U-shaped seat; 7. Second set screw; 8. Support block; 8a. Countersunk groove; 9. Positioning pin; 10. Pressure plate; 11. Locking screw. DETAILED DESCRIPTION

[0027] 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.

[0028] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0029] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0030] Combination Figure 1As shown, a drilling fixture for the center hole of a thin-sheet single-mounting plate blade comprises a fixture base plate 1, and a chuck seat 2 and a side plate 3 mounted on the top surface of the base plate 1; a U-shaped seat 6 is arranged at intervals directly above the chuck seat 2, and the first side arm of the U-shaped seat 6 is fastened to the upper part of the side plate 3 by screws; a positioning block 4, a supporting block 8 and a positioning pin 9 are arranged on the top surface of the chuck seat 2; the back surface of the positioning block 4 abuts against the front side surface of the side plate 3, and the positioning block 4 and the positioning pin 9 are respectively located at the positions of two adjacent vertical sides of the supporting block 8. A slide groove 2a is provided on the front side of the chuck seat 2, and a pressure plate 10 is installed in the slide groove 2a; a locking screw 11 is screwed on the pressure plate 10, and the locking screw 11 is screwed on the groove bottom of the slide groove 2a; the support block 8 is located between the positioning block 4 and the pressure plate 10, and the top surfaces of the positioning block 4 and the pressure plate 10 are higher than the top profile of the support block 8; the top surface of the positioning pin 9 is also higher than the top profile of the support block 8. The first set screw 5 and the second set screw 7 are screwed on the first side arm and the second side arm of the U-shaped seat 6 respectively; the first set screw 5 passes through the side plate 3 and is threadedly matched with the first side arm of the U-shaped seat 6; the first set screw 5 and the second set screw 7 are coaxially arranged, and the top tightening ends of the two are arranged oppositely. Bosses 3a are integrally formed on both sides of the bottom of the side plate 3; bolt holes are provided on the bosses 3a, and the bosses 3a are bolted to the clamp bottom plate 1.

[0031] Combination Figure 1 As shown, a recessed groove 8a is provided on the top of the support block 8, and the recessed groove 8a is used to accommodate the tenon of the single mounting plate blade. The vertical surface on the positioning block 4 close to the support block 8 is set as the positioning surface 4a; the positioning surface 4a is provided with a vertical groove 4b that penetrates up and down. The positioning surface 4a is used to contact the side surface of the edge plate blade basin side of the single mounting plate blade to form a limiting effect. The purpose of setting the vertical groove 4b is to reduce the contact area of ​​the positioning surface 4a, and only part of the positioning surface 4a needs to be used for limiting.

[0032] In this embodiment, the first set screw 5 and the second set screw 7 are both M8 knurled cylindrical head set screws, with the standard number HB306-1987. The length of the screw shank of the first set screw 5 is L=80 mm, and the length of the screw shank of the second set screw 7 is L=50 mm. The knurled cylindrical head set screws are provided with knurling, which facilitates the operator to rotate the first set screw 5 and the second set screw 7.

[0033] In this embodiment, the chuck seat 2 and the fixture base plate 1 are connected and assembled from the bottom by screws, so that the entire fixture structure is compact.

[0034] In order to ensure that the pressing plate 10 can move smoothly in the slide groove 2a to press the edge plate of the single mounting plate blade when the locking screw is turned, the single-side clearance between the groove walls on both sides of the slide groove 2a and the pressing plate 10 is required to be no greater than 0.05mm.

[0035] In this embodiment, the top surface of the support block 8 is an arc surface, and the arc surface matches the shape of the outer arc surface of the edge plate of the single mounting plate blade.

[0036] Combination Figure 2 As shown, this embodiment also provides a method for drilling and clamping a center hole of a thin-sheet single mounting plate blade, using the above-mentioned drilling fixture, including the following steps:

[0037] Step S1, vertically placing the single mounting plate blade to be processed on the top surface of the support block 8, so that the blade body of the single mounting plate blade faces upward, and the outer arc surface of the edge plate of the single mounting plate blade abuts against the top surface of the support block 8, and determining the position of the single mounting plate blade in the z direction;

[0038] Step S2, adjusting the position of the single mounting plate blade so that the edge plate end surface of the single mounting plate blade contacts the positioning pin 9 to determine the position of the single mounting plate blade in the y direction; at the same time, making the side surface of the edge plate blade basin contact the positioning block 4 to determine the position of the single mounting plate blade in the x direction;

[0039] Step S3, tighten the locking screw 11, drive the pressing plate 10 to move in the slide groove 2a along the negative direction of the x-axis and press against the side surface of the back side of the edge plate of the single mounting plate blade;

[0040] Step S4, rotate the first set screw 5 and the second set screw 7, respectively, so that the end faces of the first set screw 5 and the second set screw 7 contact the shaft neck of the single mounting plate blade, and there is no tightening force. Therefore, the positioning and clamping of the blade edge plate will not be damaged, and only the blade vibration caused by the cutting force during the center hole drilling process will be offset, and the positioning and clamping of the blade edge plate will be protected, so that the position of the blade is accurate and stable during the center hole drilling process.

[0041] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A drilling fixture for the center hole of a thin-sheet single-mounting plate blade, characterized in that: It comprises a fixture bottom plate (1), and a chuck seat (2) and a side plate (3) mounted on the top surface of the bottom plate (1); A U-shaped seat (6) is arranged at intervals just above the chuck seat (2), and a first side arm of the U-shaped seat (6) is fastened to the upper part of the side plate (3); a positioning block (4), a supporting block (8) and a positioning pin (9) are arranged on the top surface of the chuck seat (2); A slide groove (2a) is provided on the front side of the chuck seat (2), and a pressure plate (10) is installed in the slide groove (2a); a locking screw (11) is screwed on the pressure plate (10), and the locking screw (11) is screwed on the bottom of the slide groove (2a); the support block (8) is located between the positioning block (4) and the pressure plate (10), and the top surfaces of the positioning block (4) and the pressure plate (10) are higher than the top profile of the support block (8); A first set screw (5) and a second set screw (7) are screwed onto the first side arm and the second side arm of the U-shaped seat (6) respectively; the first set screw (5) passes through the side plate (3) and is threadedly matched with the first side arm of the U-shaped seat (6); the first set screw (5) and the second set screw (7) are coaxially arranged, and their tightening ends are arranged opposite to each other.

2. A drilling fixture for a center hole of a thin-sheet single mounting plate blade as claimed in claim 1, characterized in that: A recessed groove (8a) is provided on the top of the support block (8), and the recessed groove (8a) is used to accommodate the tenon of the single mounting plate blade.

3. A drilling fixture for a center hole of a thin-sheet single mounting plate blade as claimed in claim 1, characterized in that: Bosses (3a) are integrally formed on both sides of the bottom of the side plate (3); bolt holes are provided on the bosses (3a), and the bosses (3a) are bolted to the fixture bottom plate (1).

4. A drilling fixture for a center hole of a thin-sheet single mounting plate blade as claimed in claim 1, characterized in that: A vertical surface on the positioning block (4) close to the supporting block (8) is set as a positioning surface (4a); and a vertical groove (4b) penetrating up and down is set on the positioning surface (4a).

5. A drilling fixture for a center hole of a thin-sheet single mounting plate blade as claimed in claim 1, characterized in that: The first set screw (5) and the second set screw (7) are both M8 knurled cylindrical head set screws.

6. A drilling fixture for a center hole of a thin-sheet single mounting plate blade as claimed in claim 1, characterized in that: The chuck seat (2) and the fixture base plate (1) are connected and assembled from the bottom by screws.

7. A drilling fixture for a center hole of a thin-sheet single mounting plate blade as claimed in claim 1, characterized in that: The single-side clearance between the groove walls on both sides of the slide groove (2a) and the pressing plate (10) is no greater than 0.05 mm.

8. A drilling fixture for a center hole of a thin-sheet single mounting plate blade as claimed in claim 1, characterized in that: The top surface of the support block (8) is an arc surface, and the arc surface matches the shape of the outer arc surface of the edge plate of the single mounting plate blade.

9. A method for drilling and clamping a center hole of a thin-sheet single-mounting plate blade, using the drilling fixture according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step S1, vertically placing the single mounting plate blade to be processed on the top surface of the support block (8), so that the blade body of the single mounting plate blade faces upward, and the outer arc surface of the edge plate of the single mounting plate blade abuts against the top surface of the support block (8), and determining the position of the single mounting plate blade in the z direction; Step S2, adjusting the position of the single mounting plate blade so that the edge plate end surface of the single mounting plate blade contacts the positioning pin (9) to determine the position of the single mounting plate blade in the y direction; and at the same time, making the side surface of the edge plate blade basin contact the positioning block (4) to determine the position of the single mounting plate blade in the x direction; Step S3, tighten the locking screw (11), drive the pressing plate (10) to move in the slide groove (2a) along the negative direction of the x-axis and press against the side surface of the back side of the edge plate blade of the single mounting plate blade; Step S4, rotating the first set screw (5) and the second set screw (7) so that the end surfaces of the first set screw (5) and the second set screw (7) respectively contact the shaft neck portion of the single mounting plate blade.

10. A method for drilling and clamping a center hole of a thin-sheet single mounting plate blade as claimed in claim 9, characterized in that: In the step S4, the end surfaces of the tightening ends of the first tightening screw (5) and the second tightening screw (7) are only in contact with the axial neck portion of the single mounting plate blade, and no tightening force exists.

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