Fixture for machining side face hole of special-shaped part in four-axis machining center

Abstract

The utility model relates to a clamp for machining side face holes of special-shaped parts in a four-axis machining center, and belongs to the technical field of machining. The clamp body is composed of a vertical plate, a transverse plate and a cylinder, the vertical plate is a positioning surface 1, the transverse plate is divided into two parts, one part close to the vertical plate is a plane, a 90-degree right angle is formed between the plane and the vertical plate, the part is a positioning surface 2, the other part is an inclined surface, and the inclined surface is matched with the inclined surface of the special-shaped part. The two pressing plate locking pin shafts are inserted into the two pressing plate pin holes in the clamp body in advance, the special-shaped part is placed on the positioning face 2, and then the two adjustable self-positioning conical pins penetrate through the insertion holes in the two ends of the inclined face of the special-shaped part to be inserted into the two positioning holes. And finally, the wedge-shaped pressing plate is inserted into a gap between the two staggered pressing plate locking pin shafts and the special-shaped part to lock the special-shaped part. The clamp provided by the utility model solves the problem that two end holes of the special-shaped part are not coaxial during processing, and is convenient and quick to disassemble and suitable for batch production.

Description

Technical Field

[0001] This utility model relates to a fixture for machining side holes of irregularly shaped parts in a four-axis machining center, belonging to the field of mechanical processing technology. Background Technology

[0002] For a certain part, due to the large distance between the two holes on its side and the hollow shape in the middle, high coaxiality and hole precision are required. Single-sided machining cannot guarantee the required accuracy, and the cutting tool is not long enough. Using an extended tool would result in insufficient tool rigidity, leading to misalignment of the machined hole axis. Furthermore, the part is an irregularly shaped and complex part, making positioning difficult. Therefore, this invention proposes a dedicated four-axis machining center fixture for machining the side holes of irregularly shaped parts. This dedicated fixture completes the machining of both sides of the part in a single positioning operation. Utility Model Content

[0003] The purpose of this invention is to solve the problem of machining extended holes at both ends of the side of irregular parts. The holes on both sides need to be coaxial. If the machining is done from one end, the long drill bit will cause the axis to be skewed when machining the lower hole, and the coaxiality requirement cannot be guaranteed. At the same time, the extended drill bit has insufficient rigidity and low machining efficiency. Therefore, this invention proposes a fixture for machining side holes of irregular parts on a four-axis machining center, which can complete the machining of both holes in one clamping on the four-axis machining center.

[0004] The objective of this utility model is achieved through the following technical solution.

[0005] This utility model proposes a fixture for machining side holes of irregular parts in a four-axis machining center, comprising: a fixture body, a pressure plate locking pin, a wedge-shaped pressure plate, an adjustable self-positioning conical pin, the irregular part, and a cylindrical fixture body.

[0006] The clamping body consists of a vertical plate, a horizontal plate, and a cylinder. The vertical plate and the horizontal plate are integrally formed into an L-shape. The vertical plate is the positioning surface 1. The horizontal plate is divided into two parts: a flat part near the vertical plate, forming a 90° right angle with the vertical plate, which is the positioning surface 2; and a sloped part, which mates with the sloped surface of irregularly shaped parts. The vertical plate has two pressure plate pin holes of different heights. The sloped part of the horizontal plate has two positioning holes. The clamping body cylinder is installed at the bottom end of the horizontal plate.

[0007] Two pressure plate locking pins are pre-inserted into the two pressure plate pin holes on the fixture body. The two pressure plate locking pins are fixed components and are not disassembled during use. The irregular part is placed on the positioning surface 2, and the inclined surface of the irregular part fits against the inclined surface on the horizontal plate of the fixture body. Then, two adjustable self-positioning conical pins are inserted into the two positioning holes through the insertion holes at both ends of the inclined surface of the irregular part. When the adjustable self-positioning conical pins are inserted downwards, the irregular part will automatically come into close contact with the positioning surface 1. At the same time, the two adjustable self-positioning conical pins restrict the axial freedom of the irregular part. Finally, a wedge-shaped pressure plate is inserted into the gap between the two misaligned pressure plate locking pins and the irregular part. The wedge-shaped pressure plate locks the irregular part with the irregular part using the self-locking principle.

[0008] Working principle

[0009] On a four-axis machining center, a three-jaw chuck is used to clamp the cylindrical fixture body for connection and positioning with the machine tool. A dial indicator is used to straighten and align the positioning surface of the fixture body. The irregularly shaped part is placed on the fixture body, and then two adjustable self-positioning conical pins are inserted into the two positioning holes through the insertion holes at both ends of the inclined surface of the irregularly shaped part. By utilizing the conical surface fit of the two adjustable self-positioning conical pins, the positioning reference of the part is brought close to the positioning surface of the fixture body when inserted downwards, thus fulfilling the positioning requirements. Then, using the self-locking principle of the wedge plate, the wedge plate is inserted into the gap between the locking pin and the irregularly shaped part to complete the locking. Finally, the machine is started to machine the holes on the side of the irregularly shaped part. The clamping method is convenient and quick, and the operation can be completed manually.

[0010] After processing, first remove the wedge-shaped pressure plate, then pull out the adjustable self-positioning conical pin to remove the irregularly shaped parts. Then repeat the operation for batch processing.

[0011] Beneficial effects

[0012] The fixture proposed in this utility model solves the problem of machining holes with different axes at both ends of such irregularly shaped parts, achieving a 100% yield rate. It is also easy and quick to disassemble, improving processing efficiency and making it suitable for mass production. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the assembly of the fixture and parts of this utility model;

[0014] Figure 2 This is a schematic diagram of the structure of the clamping body of this utility model;

[0015] Figure 3 This is a structural schematic diagram of an irregularly shaped part;

[0016] Figure 4 This is a schematic diagram of the clamp body positioning holes and the pressure plate pin holes.

[0017] Figure 5This is a schematic diagram of the wedge-shaped pressure plate.

[0018] Figure 6 This is a schematic diagram of the structure of the pressure plate locking pin.

[0019] Figure 7 This is a schematic diagram of the adjustable self-positioning conical pin.

[0020] Figure 8 This is a three-dimensional drawing of the fixture and parts assembly of this utility model.

[0021] The numbers in the diagram are: 1-clamp body, 2-pressure plate locking pin, 3-wedge pressure plate, 4-adjustable self-positioning conical pin, 5-irregular part, 6-clamp body cylinder. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0023] Example

[0024] Combination Figures 1-8 The present invention proposes a fixture for machining side holes of irregular parts in a four-axis machining center, comprising: a fixture body 1, a pressure plate locking pin 2, a wedge-shaped pressure plate 3, an adjustable self-positioning conical pin 4, an irregular part 5, and a fixture body cylinder 6.

[0025] The clamping body 1 consists of a vertical plate, a horizontal plate, and a cylinder. The vertical plate and the horizontal plate are integrally formed into an L-shape. The vertical plate serves as the positioning surface 1. The horizontal plate is divided into two parts: a flat surface near the vertical plate, forming a 90° right angle with the vertical plate, which serves as the positioning surface 2; and an inclined surface that mates with the inclined surface of the irregularly shaped part 5. The vertical plate has two pressure plate pin holes of different heights. The inclined surface of the horizontal plate has two positioning holes. The clamping body cylinder 6 is installed at the bottom end of the horizontal plate.

[0026] Two pressure plate locking pins 2 are pre-inserted into the two pressure plate pin holes on the fixture body 1. The two pressure plate locking pins 2 are fixed elements and are not disassembled during use. The irregular part 5 is placed on the positioning surface 2. The inclined surface of the irregular part 5 fits against the inclined surface on the horizontal plate of the fixture body 1. Then, two adjustable self-positioning conical pins 4 are inserted into the two positioning holes through the insertion holes at both ends of the inclined surface of the irregular part 5. When the adjustable self-positioning conical pins 4 are inserted downwards using the conical surface characteristics, the irregular part 5 will automatically come into close contact with the positioning surface 1. At the same time, the two adjustable self-positioning conical pins 4 restrict the axial freedom of the irregular part 5. Finally, the wedge-shaped pressure plate 3 is inserted into the gap between the two misaligned pressure plate locking pins 2 and the irregular part 5. The wedge-shaped pressure plate 3 and the irregular part 5 are locked together by the self-locking principle.

[0027] Working principle

[0028] On a four-axis machining center, a three-jaw chuck is used to clamp the cylindrical fixture 6 for connection and positioning with the machine tool. A dial indicator is used to straighten and align the positioning surface of the fixture 1. The irregular part 5 is placed on the fixture 1, and then two adjustable self-positioning conical pins 4 are inserted into the two positioning holes through the insertion holes at both ends of the inclined surface of the irregular part 5. By utilizing the conical surface fit of the two adjustable self-positioning conical pins 4, the positioning reference of the part is brought close to the positioning surface of the fixture, thus fulfilling the positioning requirements. Then, using the self-locking principle of the wedge plate 3, the wedge plate 3 is inserted into the gap between the two misaligned locking pins 2 and the irregular part 5 to complete the locking. Finally, the machine is started to machine the holes on the side of the irregular part. The clamping method is convenient and quick, and the operation can be completed manually.

[0029] After processing, first remove the wedge-shaped pressure plate 3, then pull out the adjustable self-positioning conical pin 4, and remove the irregular part 5. Then repeat the operation for batch processing.

Claims

1. A fixture for machining a side hole of a special-shaped part by a four-axis machining center, characterized in that, The utility model relates to a kind of adjustable self-positioning conical pin and wedge-shaped pressing plate locking device, including: Clamp body (1), pressing plate locking pin shaft (2), wedge-shaped pressing plate (3), adjustable self-positioning conical pin (4), special-shaped part (5) and clamp body cylinder (6); The clamp body (1) is composed of a vertical plate, a horizontal plate and a cylinder, the vertical plate and the horizontal plate are integrally formed as L-shaped, the vertical plate is a positioning surface 1, the horizontal plate is divided into two parts, the part close to the vertical plate is a plane, and the vertical plate forms a right angle of 90 °, and this part is a positioning surface 2, the other part is an inclined surface, and the inclined surface cooperates with the inclined surface of the special-shaped part (5), two pressing plate pin holes with different heights are opened on the vertical plate, the inclined surface part on the horizontal plate is provided with two positioning holes, and the bottom end of the horizontal plate is provided with clamp body cylinder (6); Two pressing plate locking pin shafts (2) are inserted into the two pressing plate pin holes of the clamp body (1) in advance, the special-shaped part (5) is placed on the positioning surface 2, the inclined surface of the special-shaped part (5) is attached to the inclined surface of the horizontal plate of the clamp body (1), then two adjustable self-positioning conical pins (4) are inserted into the two positioning holes through the insertion holes at both ends of the inclined surface of the special-shaped part (5), the special-shaped part (5) is automatically close to the positioning surface 1 when the conical surface of the adjustable self-positioning conical pin (4) is inserted downward, and the two adjustable self-positioning conical pins (4) limit the axial freedom of the special-shaped part (5), finally the wedge-shaped pressing plate (3) is inserted into the gap between the two misaligned pressing plate locking pin shafts (2) and the special-shaped part (5), and the wedge-shaped pressing plate (3) and the special-shaped part (5) are locked by using the self-locking principle.

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