Arm part clamping and positioning device

Abstract

The utility model provides an arm part clamping and positioning device. The arm part clamping and positioning device comprises a foundation plate; the three-jaw chuck is arranged on the foundation plate, and the three-jaw chuck is used for clamping a precision shaft part of an arm part; the flexible clamping assembly is arranged on the foundation plate, and the flexible clamping assembly is used for being pressed on the end face of the arm part; the positioning assembly is arranged on the foundation plate, and the positioning assembly is used for positioning and clamping the arm part; the set of clamping and positioning device provided by the utility model is used for clamping and aligning, so that the problem of scrapping caused by deviation of an end face from a rotation center is avoided to a great extent; and the processing efficiency is improved.

Description

Technical Field

[0001] This application belongs to the technical field of CNC grinding machine processing, and particularly relates to a clamping and positioning device for arm parts. Background Art

[0002] Arm parts are key parts with complex structures in helicopters. Their overall structure is a triangular prism with a rotating body structure added at one end of a certain vertex. There are high-precision dimensional requirements for the two end faces from the center of rotation to the other two vertices of the triangular prism. The two side end faces not only have high-precision related dimensions but also have high surface roughness requirements, and need to be machined by CNC milling with allowance and then guaranteed by grinding.

[0003] Specifically, triangular arm parts are key parts with complex structures. There are many high-precision dimensions between their center of rotation and other elements such as the two side end faces, and their positioning and clamping are difficult. Summary of the Utility Model

[0004] The purpose of this application: In the grinding process step, a newly designed set of clamping and positioning device is used for clamping and alignment to realize the rapid clamping and centering of parts and improve the processing efficiency.

[0005] This application provides a clamping and positioning device for arm parts, and the device includes:

[0006] Base plate;

[0007] A three-jaw chuck is arranged on the base plate, and the three-jaw chuck is used for clamping the precision shaft part of the arm part;

[0008] A soft clamping assembly is arranged on the base plate, and the soft clamping assembly is used to press on the end face of the arm part;

[0009] A positioning assembly is arranged on the base plate, and the positioning assembly is used to position and clamp the arm part.

[0010] Preferably, the device further includes:

[0011] A fixing assembly for fixing the three-jaw chuck on the base plate.

[0012] Preferably, the positioning assembly includes:

[0013] A slideway base block is arranged on the base plate;

[0014] A sliding positioning block, one end of the sliding positioning block is slidably connected to the slideway base block, and the other end of the sliding positioning block positions the arm part through a positioning mandrel.

[0015] Preferably, a slideway is arranged at the upper end of the slideway base block, and one end of the sliding positioning block can slide along the slideway.

[0016] Preferably, the sliding positioning block includes:

[0017] A sliding rod capable of sliding along the slideway;

[0018] A U-shaped positioning body connected to the sliding rod, the end face of the U-shaped positioning body contacting the positioning mandrel to position the arm-like part; wherein, the positioning mandrel passes through the precision hole of the arm-like part and extends out of the precision hole at both ends.

[0019] Preferably, the soft clamping assembly includes:

[0020] A fixed base cushion block arranged on the base plate;

[0021] A pressing plate arranged on the fixed base cushion block, the pressing plate being used to press on the end face of the arm-like part.

[0022] The beneficial technical effects of the present application:

[0023] The triangular arm-like part is a key part with a complex structure. There are many high-precision dimensions between its rotation center and other elements such as the two side end faces. Its positioning and clamping are difficult. There are high-precision related dimensions on the two side end faces, and there are also high surface roughness requirements. It is necessary to leave a margin during CNC milling and then ensure it through grinding. By improving and optimizing the new processing technology and introducing a set of newly designed clamping and positioning devices for clamping and alignment, the scrap problem caused by the end face deviating from the rotation center is greatly avoided; the processing efficiency is improved. Description of the Drawings

[0024] Figure 1 is a schematic structural diagram of a triangular arm part provided by an embodiment of the present application;

[0025] Figure 2 is a clamping schematic diagram provided by an embodiment of the present application;

[0026] Figure 3 is a schematic structural diagram of the positioning device provided by an embodiment of the present application. Detailed Embodiments

[0027] Please refer to Figure 3 , a clamping and positioning device for a triangular arm-like part provided by the present application, including a triangular arm-like part 1 (see Figure 1 and Figure 2)、Base plate 2, three-jaw chuck 3, basic spacer block 4 for pressing the part, screw rod 5, pressure plate 6, screw 7, nut 8 for fixing the basic spacer block 4, nut 9 for pressing the part, screw 10 in contact with the part, positioning mandrel 11 for fitting with the precision hole of the triangular arm part 1, sliding positioning block 12 for positioning, slideway base block 15, screw rod 14 for fixing the slideway base block 15, nut 13, screw rod 16 for fixing the three-jaw chuck 3, screw 17, pressure plate 18, nut 19.

[0028] Fix the three-jaw chuck 3 on the base plate 2 with the screw rod 16, screw 17, pressure plate 18 and nut 19; fix the basic spacer block 4 on the base plate 2 with the screw rod 5 and nut 8; fix the slideway base block 15 on the base plate 2 with the screw rod 14 and nut 13, and install the sliding positioning block 12 into the slideway base block 15; roughly clamp the triangular arm part 1 with the three-jaw chuck 3, and insert the positioning mandrel 11 into the precision hole of the triangular arm part 1; slowly push the sliding positioning block 12 towards the positioning mandrel 11 while gently tightening the three-jaw chuck 3 until the sliding positioning block 12 fits with the positioning mandrel 11 and the three-jaw chuck 3 is tightened; push the sliding positioning block 12 back away from the part 1, remove the positioning mandrel 11, and the part 1 enters the machinable state.

[0029] In a feasible implementation manner, the processing technology method provided by the present application:

[0030] The first step: While numerically controlling the semi-finishing of the contour, machine two center holes at both ends in the direction of the center line of the rotating body.

[0031] The second step: Machine the precision dimensions of the rotating body features by using the clamping method with two centers (see Figure 2 ); (see Figure 1 )

[0032] The third step: Adopt the clamping method with two centers for evaluation (see Figure 2 ): Detect the dimensions between the center of the rotating body and the two end faces. For the side of the part where the measured dimension is smaller than the drawing dimension, calculate the compensation offset machining value within the allowable dimension tolerance range on this side, and mark it with a marker pen on this side of the part;

[0033] The fourth step: Grind the end face: Use a newly designed set of clamping and positioning devices (see Figure 3 ), clamp the part well, and according to the evaluation result of the previous step, perform offset machining by the calculated value for the parts that need compensation machining, and the remaining parts can be machined normally.

Claims

1. A clamping and positioning device for arm-type parts, characterized in that, The device includes: A base plate; A three-jaw chuck, arranged on the base plate, and the three-jaw chuck is used for clamping the precision shaft part of the arm-type part; A soft clamping assembly, arranged on the base plate, and the soft clamping assembly is used for pressing on the end face of the arm-type part; A positioning assembly, arranged on the base plate, and the positioning assembly is used for positioning and clamping the arm-type part; Wherein, the positioning assembly includes: A slideway base block, arranged on the base plate; A sliding positioning block, one end of the sliding positioning block is slidably connected to the slideway base block, and the other end of the sliding positioning block positions the arm-type part through a positioning mandrel; Wherein, the soft clamping assembly includes: A fixed base cushion block, arranged on the base plate; A pressing plate, arranged on the fixed base cushion block, and the pressing plate is used for pressing on the end face of the arm-type part.

2. The device according to claim 1, characterized in that The device further includes: A fixing assembly, used for fixing the three-jaw chuck on the base plate.

3. The device according to claim 2, characterized in that, A slideway is arranged at the upper end of the slideway base block, and one end of the sliding positioning block can slide along the slideway.

4. The device according to claim 3, characterized in that The sliding positioning block includes: A slide rod, capable of sliding along the slideway; A U-shaped positioning body, connected to the slide rod, and the end face of the U-shaped positioning body contacts the positioning mandrel to position the arm-type part; wherein, the positioning mandrel passes through the precision hole of the arm-type part and extends out of the precision hole at both ends.

Images