Adjustable clamp for CNC machining of high-precision aviation forging parts

Abstract

The utility model provides an adjustable fixture for CNC (computer numerical control) machining of high-precision aviation forging parts, which comprises a bottom plate, a left fixture main body and a right fixture main body are arranged on the bottom plate at intervals, and a positioning block and a pressing plate are arranged on the upper end face of each of the left fixture main body and the right fixture main body. The two positioning blocks are oppositely arranged on the adjacent sides of the left clamp body and the right clamp body, and the pressing plate is located on the outer sides of the two positioning blocks. The upper end faces of the two positioning blocks are each provided with an adjustable positioning pressing plate, the positioning blocks are detachably connected with the adjustable positioning pressing plates, and the adjustable positioning pressing plates can move in the width direction of the bottom plate relative to the positioning blocks. Longitudinal sections of the two pressing plates are 7-shaped, long kidney-shaped round holes which penetrate through the upper end faces and the lower end faces of the pressing plates and extend in the direction perpendicular to the length direction of the bottom plate are formed in the transverse portions of the two pressing plates, and first bolts are inserted into the long kidney-shaped round holes. According to the adjustable clamp, the machining precision is improved, the clamping time is shortened, the clamping difficulty is reduced, and the stability of batch production is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of CNC machining fixtures, and particularly relates to an adjustable fixture for CNC machining of high-precision aviation forgings. Background Art

[0002] Due to the instability of the self-size of high-precision aviation forgings, and their relatively complex and irregular shapes and draft angles around the body, inaccurate positioning caused by the defects of the blank itself during clamping, slight deformation of the blank during clamping, and the influence of different batches of forgings on clamping will all lead to an extremely unstable machining environment, increasing the machining difficulty for subsequent high-precision dimension machining. Summary of the Utility Model

[0003] In view of the above problems, the utility model provides an adjustable fixture for CNC machining of high-precision aviation forgings, which improves the machining accuracy, reduces the clamping time and difficulty, and improves the stability of batch production.

[0004] To achieve the above object, the utility model adopts the following technical scheme:

[0005] An adjustable fixture for CNC machining of high-precision aviation forgings, including a bottom plate, on which a left fixture body and a right fixture body are arranged at intervals. On the upper end faces of the left fixture body and the right fixture body, there is a positioning block and a pressing plate respectively. The two positioning blocks are located at the same end of the adjacent sides of the left fixture body and the right fixture body, and the pressing plate is located on the side of the positioning block away from its adjacent positioning block; on the upper end faces of the two positioning blocks, there is an adjustable positioning pressing plate respectively. Each positioning block is detachably connected to an adjustable positioning pressing plate, and the adjustable positioning pressing plate can move relative to the positioning block along the width direction of the bottom plate; the longitudinal sections of the two pressing plates are in the shape of "7". The lower ends of the vertical parts of the two pressing plates are respectively connected to the left fixture body and the right fixture body. On the transverse parts of the two pressing plates, there are long waist-shaped round holes penetrating through their upper and lower end faces and extending along the direction perpendicular to the length direction of the bottom plate, and a first bolt is inserted into the long waist-shaped round holes of the pressing plates.

[0006] Further, on the lower end faces of the transverse parts of the two pressing plates, on the side away from the vertical parts, there are a left plane correction block and a right plane correction block respectively.

[0007] Further, on the lower end faces of the transverse parts of the two pressing plates, on the side away from the vertical parts, there are arc concave surfaces extending from the inside to the free ends of the transverse parts. The upper end faces of the left plane correction block and the right plane correction block are both arc convex surfaces adapted to the arc concave surfaces, and the left plane correction block and the right plane correction block are respectively fixed at the arc concave surfaces of the two pressing plates.

[0008] Further, a first flat adjusting gasket is provided between the first bolt and the upper opening of the long oval hole on the pressing plate.

[0009] Further, long oval holes extending along the length direction perpendicular to the bottom plate are provided on the adjustable positioning pressing plate, screw holes extending downward from the upper end face are provided on the positioning blocks, and each positioning block is connected to an adjustable positioning pressing plate through a second bolt.

[0010] Further, a second flat adjusting gasket is provided between the second bolt and the upper opening of the long oval hole on the adjustable positioning pressing plate.

[0011] Further, screw holes penetrating the upper and lower end faces are provided on both the left fixture body and the right fixture body, and the lower end of the vertical portion of the pressing plate is connected through a third bolt passing through the screw hole.

[0012] Further, the upper end faces of the left fixture body and the right fixture body are connected to the bottom plate through a plurality of positioning pins and a plurality of third bolts passing through the bottom plate.

[0013] Further, an auxiliary positioning post is provided on the bottom plate on the side of the left fixture body away from the right fixture body.

[0014] The adjustable fixture for CNC machining of high-precision aviation forgings of the present utility model realizes fine adjustment and clamping according to the shape and size of a single forging by setting an adjustable positioning pressing plate, a flat adjustable gasket and a flat calibration pad, ensuring the stability of clamping and improving the production efficiency and machining stability during CNC machining. Description of the Drawings

[0015] Figure 1 is a disassembled structural schematic diagram of the adjustable fixture for CNC machining of high-precision aviation forgings of the present utility model.

[0016] Figure 2 is a three-dimensional assembled structural diagram of the adjustable fixture for CNC machining of high-precision aviation forgings of the present utility model.

[0017] Wherein, 1 - first bolt, 2 - flat adjusting gasket, 3 - pressing plate, 4 - right flat calibration block, 5 - right fixture body, 6 - bottom plate, 7 - positioning pin, 8 - second bolt, 9 - second flat adjusting gasket, 10 - left flat calibration block, 11 - adjustable positioning pressing plate, 12 - left fixture body, 13 - auxiliary positioning post, 14 - third bolt, 15 - positioning block. Detailed Embodiment

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way restrictive of the present invention and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0019] As Figures 1 - 2 shown, an adjustable fixture for CNC machining of high-precision aviation forgings includes a bottom plate 6. On the bottom plate 6, a left fixture body 12 and a right fixture body 5 are arranged at intervals. On the bottom plate 6 on the side of the left fixture body 12 away from the right fixture body 5, an auxiliary positioning post 13 is provided; on the upper end faces of the left fixture body 12 and the right fixture body 5, a positioning block 15 and a pressing plate 3 are respectively provided. The two positioning blocks 15 are located at the same end of the adjacent sides of the left fixture body 12 and the right fixture body 5. The pressing plate 3 is located on the side of the positioning block 15 away from its adjacent positioning block 15; on the upper end faces of the two positioning blocks 15, an adjustable positioning pressing plate 11 is provided. Each positioning block 15 is detachably connected to an adjustable positioning pressing plate 11, and the adjustable positioning pressing plate 11 can move relative to the positioning block 15 along the width direction of the bottom plate 6; the longitudinal sections of the two pressing plates 3 are in the shape of a "7". The lower ends of the vertical parts of the two pressing plates 3 are respectively connected to the left fixture body 12 and the right fixture body 5. On the transverse parts of the two pressing plates 3, long oval holes penetrating through their upper and lower end faces and extending along the direction perpendicular to the length direction of the bottom plate 6 are provided. A first bolt 1 is inserted into the long oval holes of the pressing plate 3. Between the upper opening of the long oval hole of the first bolt 1 and the pressing plate 3, a first flat adjusting gasket 2 is provided.

[0020] On the lower end faces of the transverse parts of the two pressing plates 3, on the sides away from the vertical parts, a left flat calibration block 10 and a right flat calibration block 4 are respectively provided; on the lower end faces of the transverse parts of the two pressing plates 3, on the sides away from the vertical parts, they are arc concave surfaces extending from the inside to the free ends of the transverse parts. The upper end faces of the left flat calibration block 10 and the right flat calibration block 3 are both arc convex surfaces adapted to the arc concave surfaces. The left flat calibration block 10 and the right flat calibration block 4 are respectively fixed at the arc concave surfaces of the two pressing plates 3.

[0021] On the adjustable positioning pressing plate 11, long oval holes extending along the direction perpendicular to the length direction of the bottom plate 6 are provided. On the positioning block 15, screw holes extending downward from its upper end face are provided. Each positioning block 15 is connected to an adjustable positioning pressing plate 11 through a second bolt 8. Between the upper opening of the long oval hole of the second bolt 8 and the adjustable positioning pressing plate 11, a second flat adjusting gasket 9 is provided.

[0022] A screw hole penetrating the upper and lower end faces is formed in each of the left clamp body 12 and the right clamp body 5, and the lower end of the vertical portion of the pressing plate 3 is connected through a third bolt 14 passing through the screw hole; the upper end faces of the left clamp body 12 and the right clamp body 5 are connected to the bottom plate 6 through a plurality of positioning pins 7 and a plurality of third bolts 14 passing through the bottom plate 6.

[0023] The workpiece plane is adjusted by the left plane correction block 10 and the left plane correction block 4 and fixed by using the adjusting gasket 9, so as to realize the quick clamping and positioning of slight differences in the outer shapes of castings in different batches.

[0024] Those of ordinary skill in the art should understand that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An adjustable fixture for CNC machining of high-precision aviation forgings, characterized in that: It includes a base plate, on which a left clamp body and a right clamp body are spaced apart, and a positioning block and a pressure plate are respectively provided on the upper end surfaces of the left clamp body and the right clamp body, the two positioning blocks are located at the same end of the adjacent sides of the left clamp body and the right clamp body, and the pressure plate is located on the side of the positioning block away from its adjacent positioning block; an adjustable positioning pressure plate is provided on the upper end surfaces of the two positioning blocks, each of the positioning blocks is detachably connected to an adjustable positioning pressure plate, and the adjustable positioning pressure plate can be moved relative to the positioning block along the width direction of the base plate; the longitudinal sections of the two pressure plates are in the shape of a figure 7, and the lower ends of the vertical parts of the two pressure plates are respectively connected to the left clamp body and the right clamp body, and long waist circular holes are provided on the transverse parts of the two pressure plates, which penetrate the upper and lower end surfaces thereof and extend in a direction perpendicular to the length of the base plate, and a first bolt is inserted into the long waist circular hole of the pressure plate.

2. The adjustable clamp according to claim 1, characterized in that: A left plane correction block and a right plane correction block are respectively provided on one side of the lower end surface of the transverse portion of the two pressing plates away from the vertical portion.

3. The adjustable clamp according to claim 2, characterized in that: The lower end surface of the transverse portion of the two pressure plates is on the side away from the vertical portion, which is an arc concave surface extending from the free end of the inward transverse portion. The upper end surfaces of the left plane correction block and the right plane correction block are both arc convex surfaces that match the arc concave surface. The left plane correction block and the right plane correction block are respectively fixed on the arc concave surfaces of the two pressure plates.

4. The adjustable clamp according to claim 1, characterized in that: A first plane adjusting gasket is arranged between the first bolt and the upper opening of the long waist circular hole on the pressing plate.

5. The adjustable clamp according to claim 1, characterized in that: The adjustable positioning platen is provided with a long round hole extending in a direction perpendicular to the length of the base plate, the positioning block is provided with a screw hole extending downward from its upper end surface, and each positioning block is connected to an adjustable positioning platen by a second bolt.

6. The adjustable clamp according to claim 5, characterized in that: A second plane adjusting gasket is arranged between the second bolt and the upper opening of the long waisted circular hole on the adjustable positioning pressing plate.

7. The adjustable clamp according to claim 1, characterized in that: A screw hole penetrating the upper and lower end surfaces of the left clamp body and the right clamp body are provided, and the lower end of the vertical portion of the pressure plate is connected by a third bolt penetrating the screw hole.

8. The adjustable clamp according to claim 1, characterized in that: The upper end surfaces of the left clamp body and the right clamp body are connected to the bottom plate through a plurality of positioning pins and a plurality of third bolts penetrating the bottom plate.

9. The adjustable clamp according to claim 1, characterized in that: An auxiliary positioning column is arranged on the bottom plate located at the side of the left clamp body away from the right clamp body.

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