Turning clamp and method for shaft neck threads on fan rectification blades

Abstract

The invention relates to the technical field of aero-engine blade machining, in particular to a turning clamp and method for a journal thread on a fan rectifying blade. The turning clamp comprises a semicircular base and a semicircular cover body buckled on the semicircular base; the semicircular base and the semicircular cover body are connected through a plurality of screws; the semicircular base comprises a first clamping part and a second clamping part; the semicircular cover body comprises a third clamping part and a fourth clamping part; the first clamping part is in butt joint with the third clamping part and is used for clamping a lower shaft neck of the rectifying blade; and the second clamping part and the fourth clamping part are in butt joint and are used for clamping a column body, close to the margin plate, of an upper shaft neck of the rectifying blade. The turning clamp is adopted in the turning method. According to the turning clamp, a full-wrapping type clamping mode is formed for the rectifying blade, clamping is stable and reliable, rigidity is good, deformation is not prone to being generated in the turning process, and machining precision is high.

Description

Technical Field

[0001] The invention relates to the technical field of aircraft engine blade processing, and in particular to a turning fixture and method for a journal thread on a fan straightening blade. Background Art

[0002] The fan rectifier blade needs to be threaded on the upper journal. The traditional process is to clamp the upper journal of the blade with a spring chuck and then turn the thread of the upper journal.

[0003] The following problems exist when turning by clamping with a spring chuck: the upper shaft neck of the fan rectifying blade has only a 5.5 mm long area available for positioning and clamping. When processing the blade, the area where the spring chuck clamps the upper shaft neck is too short, which greatly reduces the clamping force of the spring chuck. When processing the thread, the position of the blade will change significantly, which seriously affects the thread processing accuracy and sometimes causes damage to the thread turning tool. Therefore, a turning fixture and method for the shaft neck thread of the fan rectifying blade is urgently needed. Summary of the invention

[0004] The main purpose of the present invention is to provide a turning fixture and method for the journal thread on a fan straightening blade, aiming to solve the above-mentioned technical problems.

[0005] To achieve the above-mentioned objectives, on the one hand, the present invention proposes a turning fixture for the shaft neck thread on a fan straightening blade, comprising a semicircular base and a semicircular cover body buckled on the semicircular base; the semicircular base and the semicircular cover body are connected by multiple screws; the semicircular base comprises a first clamping part and a second clamping part; the semicircular cover body comprises a third clamping part and a fourth clamping part; the first clamping part is connected to the third clamping part and is used to clamp the lower shaft neck of the straightening blade; the second clamping part is connected to the fourth clamping part and is used to clamp the upper shaft neck of the straightening blade close to the column of the edge plate.

[0006] Preferably, the semicircular base further includes a clamping portion, and the clamping portion is formed on the left end surface of the first clamping portion.

[0007] Preferably, semicircular grooves are respectively provided on the docking planes of the first clamping part and the third clamping part. After the first clamping part and the third clamping part are connected to each other, the grooves of the two parts jointly form a first clamping hole and clamp the lower journal of the straightening blade.

[0008] Preferably, semicircular grooves are respectively provided on the docking planes of the second clamping part and the fourth clamping part. After the second clamping part and the fourth clamping part are connected with each other, their grooves jointly form a second clamping hole and clamp the upper journal of the straightening blade close to the column of the edge plate.

[0009] Preferably, the axes of the clamping portion, the first clamping hole and the second clamping hole are collinear.

[0010] Preferably, when the semicircular cover is buckled onto the semicircular base, the central axis of the spliced ​​column formed by the two is colinear with the axis of the clamping portion.

[0011] Preferably, the semicircular base and the semicircular cover are formed by turning the same bar stock and then dividing it by wire cutting.

[0012] Preferably, a first empty slot is provided between the first clamping part and the second clamping part of the semicircular base; a second empty slot is provided between the third clamping part and the fourth clamping part of the semicircular cover body; the first empty slot and the second empty slot together form a rectangular through slot for accommodating the blade body of the straightening blade.

[0013] Preferably, the number of the screws is four, two of which are arranged near the first clamping part and the third clamping part, and the other two are arranged near the second clamping part and the fourth clamping part, and the four screws are distributed in a rectangular shape.

[0014] On the other hand, the present invention also provides a method for turning a journal thread on a fan straightening blade, using the above-mentioned turning fixture, comprising the following steps:

[0015] S1. Clamp the semicircular base onto the three-jaw chuck of the lathe;

[0016] S2, placing the rectifying blade to be turned on the semicircular base;

[0017] S3, buckle the semicircular cover body onto the semicircular base and fasten it with screws, so that the first clamping portion of the semicircular base and the third clamping portion of the semicircular cover body are connected to each other and clamp the lower journal of the straightening blade together; at the same time, the second clamping portion of the semicircular base and the fourth clamping portion of the semicircular cover body are connected to each other and clamp the upper journal of the straightening blade close to the column of the edge plate together;

[0018] S4. Start the lathe and turn threads on the upper journal of the rectifier blade.

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

[0020] (1) The turning fixture provided by the present invention forms a fully enclosed clamping method for the rectifier blade, that is, the blade body of the rectifier blade is located in the entire turning fixture, and the lower journal and the upper journal are clamped at the same time. The clamping is stable and reliable, the rigidity is good, the clamping method is optimized, deformation is not easy to occur during the turning process, and the processing accuracy is high. It is suitable for thread processing of double-journal blades with a too short clamping part of the upper journal.

[0021] (2) The turning fixture provided by the present invention has a simple structure and is convenient and quick to clamp, which greatly improves the processing efficiency of the journal thread on the rectifying blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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.

[0023] Figure 1 This is a schematic diagram of the turning fixture provided by the present invention after clamping the rectifying blade;

[0024] Figure 2 It is a schematic diagram of the semicircular base and the screw in the present invention when they are matched;

[0025] Figure 3 A schematic diagram of placing the straightening blades on a semicircular base;

[0026] Figure 4 It is a front view of the semicircular base in the present invention;

[0027] Figure 5 A top view of the semicircular base in the present invention;

[0028] Figure 6 It is a right side view of the semicircular base in the present invention;

[0029] Figure 7 It is a front view of the semicircular cover body in the present invention;

[0030] Figure 8 A bottom view of the semicircular cover body of the present invention;

[0031] Fig. 9 It is a right side view of the semicircular cover body in the present invention.

[0032] Explanation of the accompanying drawings: 1. Semicircular base; 1a. First clamping part; 1b. Second clamping part; 1c. Clamping part; 1d. First empty slot; 2. Semicircular cover; 2a. Third clamping part; 2b. Fourth clamping part; 2c. Second empty slot; 3. Screw. DETAILED DESCRIPTION

[0033] 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.

[0034] 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.

[0035] 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.

[0036] As shown in the accompanying drawings, on the one hand, this embodiment provides a turning fixture for the shaft neck thread on the fan straightening blade, including a semicircular base 1 and a semicircular cover body 2 snapped onto the semicircular base 1; the semicircular base 1 and the semicircular cover body 2 are connected by multiple screws 3; the semicircular base 1 includes a first clamping part 1a and a second clamping part 1b; the semicircular cover body 2 includes a third clamping part 2a and a fourth clamping part 2b; the first clamping part 1a is connected to the third clamping part 2a and is used to clamp the lower shaft neck of the straightening blade; the second clamping part 1b is connected to the fourth clamping part 2b and is used to clamp the upper shaft neck of the straightening blade close to the column of the edge plate.

[0037] In this embodiment, in order to facilitate the clamping of the turning fixture on the three-jaw chuck on the lathe, the semicircular base 1 also includes a clamping portion 1c, and the clamping portion 1c is formed on the left end surface of the first clamping portion 1a. The three-jaw chuck on the lathe can be directly clamped on the outer cylindrical surface of the clamping portion 1c.

[0038] Combination Figure 5 and Figure 8 As shown, semicircular grooves are respectively provided on the docking planes of the first clamping part 1a and the third clamping part 2a. After the first clamping part 1a and the third clamping part 2a are connected, the grooves of the two together form a first clamping hole and clamp the lower journal of the straightening blade. Further, semicircular grooves are respectively provided on the docking planes of the second clamping part 1b and the fourth clamping part 2b. After the second clamping part 1b and the fourth clamping part 2b are connected, the grooves of the two together form a second clamping hole and clamp the upper journal of the straightening blade close to the column of the edge plate. The axes of the clamping part 1c, the first clamping hole and the second clamping hole are collinear.

[0039] By adopting the above structure, when the turning fixture clamps the rectifying blade, the lower journal of the rectifying blade is clamped in the first clamping hole, and the column of the upper journal of the rectifying blade close to the edge plate is clamped in the second clamping hole. This makes the center of the rectifying blade coincide with the rotation center of the turning fixture, and the blade rotates around the lathe spindle axis together with the turning when processing the thread.

[0040] In this embodiment, when the semicircular cover 2 is buckled onto the semicircular base 1, the central axis of the spliced ​​column formed by the two is collinear with the axis of the clamping portion 1c. This structure makes the rotation axis of the entire clamp collinear with the axis of the clamping portion 1c, avoiding eccentric force during rotation.

[0041] In this embodiment, the semicircular base 1 and the semicircular cover 2 are formed by turning the same bar stock and then dividing it by wire cutting.

[0042] Combination Figure 1 As shown, a first empty slot 1d is provided between the first clamping portion 1a and the second clamping portion 1b of the semicircular base 1; a second empty slot 2c is provided between the third clamping portion 2a and the fourth clamping portion 2b of the semicircular cover 2; the first empty slot 1d and the second empty slot 2c together form a rectangular through slot for accommodating the blade body of the rectifying blade.

[0043] In this embodiment, there are four screws 3, two of which are arranged near the first clamping portion 1a and the third clamping portion 2a, and the other two are arranged near the second clamping portion 1b and the fourth clamping portion 2b, and the four screws 3 are distributed in a rectangular shape. With the above structure, the force between the semicircular base 1 and the semicircular cover 2 can be evenly applied, so that the blades can be clamped better.

[0044] On the other hand, this embodiment also provides a method for turning a journal thread on a fan straightening blade, using the above-mentioned turning fixture, comprising the following steps:

[0045] S1. Clamp the semicircular base 1 on the three-jaw chuck of the lathe.

[0046] S2. Place the rectifying blade to be turned on the semicircular base 1.

[0047] S3. Snap the semicircular cover body 2 onto the semicircular base 1 and fasten it with screws 3, so that the first clamping portion 1a of the semicircular base 1 is connected with the third clamping portion 2a of the semicircular cover body 2 and they jointly clamp the lower shaft neck of the straightening blade; at the same time, the second clamping portion 1b of the semicircular base 1 is connected with the fourth clamping portion 2b of the semicircular cover body 2 and they jointly clamp the upper shaft neck of the straightening blade close to the column of the edge plate.

[0048] S4. Start the lathe and turn threads on the upper journal of the rectifier blade.

[0049] Combination Figure 3 As shown, in step S2, when the straightening blade to be turned is placed on the semicircular base 1, the lower journal of the straightening blade is placed in the semicircular groove of the first clamping part 1a, and the column of the upper journal close to the edge plate is placed in the semicircular groove of the second clamping part 1b, and the end face of the edge plate at the upper journal abuts against the left end face of the second clamping part 1b. At this time, the positioning of the straightening blade can be completed.

[0050] 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 turning fixture for the journal thread on a fan straightening blade, characterized in that: It comprises a semicircular base (1) and a semicircular cover body (2) buckled on the semicircular base (1); the semicircular base (1) and the semicircular cover body (2) are connected by a plurality of screws (3); The semicircular base (1) comprises a first clamping portion (1a) and a second clamping portion (1b); The semicircular cover body (2) comprises a third clamping portion (2a) and a fourth clamping portion (2b); The first clamping portion (1a) is connected to the third clamping portion (2a) and is used to clamp the lower journal of the straightening blade; The second clamping portion (1b) is connected to the fourth clamping portion (2b) and is used to clamp the upper journal of the straightening blade close to the column of the edge plate.

2. A turning fixture for the journal thread on a fan straightening blade according to claim 1, characterized in that: The semicircular base (1) further comprises a clamping portion (1c), wherein the clamping portion (1c) is formed on the left end surface of the first clamping portion (1a).

3. A turning fixture for the journal thread on a fan straightening blade according to claim 2, characterized in that: Semicircular grooves are respectively arranged on the docking planes of the first clamping part (1a) and the third clamping part (2a); after the first clamping part (1a) and the third clamping part (2a) are docked, the grooves of the two parts jointly form a first clamping hole and clamp the lower journal of the rectifying blade.

4. A turning fixture for the journal thread on a fan straightening blade according to claim 3, characterized in that: Semicircular grooves are respectively arranged on the docking planes of the second clamping part (1b) and the fourth clamping part (2b). After the second clamping part (1b) and the fourth clamping part (2b) are connected to each other, the grooves of the two parts jointly form a second clamping hole and clamp the upper shaft neck of the rectifying blade close to the column of the edge plate.

5. A turning fixture for the journal thread on a fan straightening blade according to claim 4, characterized in that: The axes of the clamping portion (1c), the first clamping hole and the second clamping hole are collinear.

6. A turning fixture for the journal thread on a fan straightening blade according to claim 2, characterized in that: When the semicircular cover (2) is buckled onto the semicircular base (1), the central axis of the spliced ​​column formed by the two together is colinear with the axis of the clamping portion (1c).

7. A turning fixture for the journal thread on a fan straightening blade according to claim 1, characterized in that: The semicircular base (1) and the semicircular cover (2) are formed by turning the same bar stock and then dividing it by wire cutting.

8. A turning fixture for the journal thread on a fan straightening blade according to claim 1, characterized in that: A first open slot (1d) is provided between the first clamping portion (1a) and the second clamping portion (1b) of the semicircular base (1); A second empty slot (2c) is provided between the third clamping portion (2a) and the fourth clamping portion (2b) of the semicircular cover body (2); The first empty slot (1d) and the second empty slot (2c) together form a rectangular through slot for accommodating the blade body of the rectifying blade.

9. A turning fixture for the journal thread on a fan straightening blade according to claim 1, characterized in that: The number of the screws (3) is four, two of which are arranged near the first clamping portion (1a) and the third clamping portion (2a), and the other two are arranged near the second clamping portion (1b) and the fourth clamping portion (2b), and the four screws (3) are distributed in a rectangular shape.

10. A method for turning the journal thread on a fan straightening blade, characterized in that: The turning fixture according to any one of claims 1 to 9 comprises the following steps: S1. Clamp the semicircular base (1) on the three-jaw chuck of a lathe; S2, placing the rectifying blade to be turned on the semicircular base (1); S3, buckling the semicircular cover body (2) onto the semicircular base (1) and fastening them with screws (3), so that the first clamping portion (1a) of the semicircular base (1) and the third clamping portion (2a) of the semicircular cover body (2) are in contact with each other and jointly clamp the lower journal of the straightening blade; at the same time, the second clamping portion (1b) of the semicircular base (1) and the fourth clamping portion (2b) of the semicircular cover body (2) are in contact with each other and jointly clamp the upper journal of the straightening blade close to the column of the edge plate; S4. Start the lathe and turn threads on the upper journal of the rectifier blade.

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