Unstressed clamping method for low-rigidity ring stand part

Abstract

The invention discloses an unstressed clamping method for a low-rigidity ring stand part, which comprises the following steps of: firstly, selecting four clamping points to respectively install pneumatic corner cylinders and a lead screw stepping motor, after the ring stand part is placed, selecting three pneumatic corner cylinders as main positioning to finish three-point positioning clamping of the ring stand part, recording the numerical value of a displacement sensor, and calculating the position of the ring stand part according to the numerical value of the displacement sensor; and then a lead screw stepping motor at the fourth clamping point is started to record the numerical value of the force sensor at the moment, and the PLC starts a clamping error compensation control instruction to drive the lead screw stepping motor to move in the reverse direction until stress-free clamping of the ring frame part is completed. Through cooperation of the lead screw stepping motor and the pneumatic corner cylinder, monitoring feedback of the displacement sensor and the force sensor and a PLC control instruction, automatic clamping of the ring frame part can be achieved, the clamping deformation amount of the ring frame part can be automatically monitored, accordingly, the posture of the ring frame part is adjusted in real time, and the clamping deformation amount is smaller than 0.005 mm.

Description

Technical Field

[0001] The invention belongs to the technical field of low-rigidity parts manufacturing, and in particular relates to a stress-free clamping method for low-rigidity ring frame parts. Background Art

[0002] As the core parts of optoelectronic products, ring frame parts are the control carriers of optical axis pointing and stability, and have the characteristics of high precision and lightweight design.

[0003] At the same time, in the manufacturing process of ring frame parts, due to the structural characteristics of thin walls, multiple slots, low rigidity, and lack of clamping positions, the parts are extremely sensitive to deformation due to errors in the point and direction of clamping force.

[0004] Currently, operators mostly use pressure plate clamping combined with multiple dial indicators to monitor part deformation and simultaneously adjust the pressure plate preload to control part deformation to less than 0.01mm. The entire process relies on workers' experience, and the clamping process is time-consuming and labor-intensive. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a stress-free clamping method for low-rigidity ring frame parts.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a stress-free clamping method for low-rigidity ring frame parts, comprising the following steps: S1, select the four corners of a rectangle on a fixed plane as four clamping points, install the pneumatic angle cylinder and the screw stepper motor respectively, install the force sensor above the screw stepper motor shaft, place the displacement sensor directly above the force sensor, and connect the pneumatic angle cylinder and the screw stepper motor through PLC; S2, place the ring frame part on top of four pneumatic angle cylinders in a specified direction to contact the displacement sensor probe, select three pneumatic angle cylinders as the main positioning clamping points, control the three pneumatic angle cylinders to rotate into place through PLC to complete the three-point positioning clamping of the ring frame part, and record the value of the displacement sensor at this time; S3, start the screw stepper motor under the fourth clamping point, record the value of the force sensor, and the screw stepper motor axially contacts the ring frame part. If the monitored force sensor value is greater than the set threshold, the screw stepper motor stops moving, and the fourth pneumatic angle cylinder of the auxiliary support is controlled by PLC to rotate into place, completing the auxiliary clamping of the ring frame part; S4, according to the value of the displacement sensor, the PLC starts the clamping error compensation control instruction to drive the screw stepper motor to move in the opposite direction until the displacement sensor value returns to the initial position. At this time, the deformation of the ring frame part returns to the position before the support, completing the stress-free clamping of the ring frame part.

[0007] Furthermore, the method also includes the steps of first controlling the fourth pneumatic rotary cylinder of the auxiliary support to loosen through the PLC, and then controlling the three pneumatic rotary cylinders of the main positioning to loosen, so as to disassemble the ring frame parts.

[0008] Furthermore, the probe is clamped on the displacement sensor through a magnetic base.

[0009] The beneficial effects of the present invention are: compared with the traditional manual clamping method of dial indicator monitoring and pressure plate clamping, the present invention is based on the monitoring feedback of the screw stepper motor, the pneumatic angle cylinder and the force sensor, and realizes the automatic clamping, automatic monitoring and deformation compensation adjustment of the ring frame parts through PLC control instructions, which can ensure that the clamping deformation is less than 0.005mm and the clamping time is less than 15min. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the stress-free clamping method of the low-rigidity ring frame of the present invention; Figure 2 It is the control interface of the low-rigidity ring frame stress-free clamping method of the present invention.

[0011] The reference numerals of the drawings are: 1—ring frame part, 2—pneumatic angle cylinder, 3—force sensor, 4—screw stepper motor, 5—displacement sensor. DETAILED DESCRIPTION

[0012] Reference Figure 1 As shown, this example proposes a stress-free clamping method for low-rigidity ring frame parts, which includes the following steps.

[0013] S1. Select the four corners of a rectangle on a fixed plane as the clamping points, install the pneumatic swivel cylinder 2 and the screw stepper motor 4 respectively, install the force sensor 3 above the shaft of the screw stepper motor 4, place the displacement sensor 5 directly above the force sensor 3, and connect the pneumatic swivel cylinder 2 and the screw stepper motor 4 through PLC.

[0014] S2, place the ring frame part 1 above the four pneumatic angle cylinders 2 in a specified direction to contact the displacement sensor 5 probe, and the probe is clamped on the displacement sensor 5 through a magnetic table base, such as Figure 1 As shown, three pneumatic rotary cylinders 2 are selected as the main positioning clamping points to be connected to the ring frame part 1. The three pneumatic rotary cylinders 2 are controlled by PLC to rotate into place to complete the three-point positioning clamping of the ring frame part 1, and the value of the displacement sensor 5 is recorded at this time.

[0015] S3, start the screw stepper motor 4 under the fourth clamping point, record the value of the force sensor 3, and the screw stepper motor 4 axially contacts the ring frame part 1. If the value monitored by the force sensor 3 is greater than the set threshold, the screw stepper motor 4 stops moving, and the fourth pneumatic angle cylinder 2 is controlled by PLC to rotate into place, completing the auxiliary clamping of the ring frame part 1.

[0016] S4, according to the value of the displacement sensor 5, the PLC starts the clamping error compensation control command to drive the screw stepper motor 4 to move in the opposite direction until the value of the displacement sensor 5 returns to the initial position. At this time, the deformation of the ring frame part 1 returns to the position before the support, and the stress-free clamping of the ring frame part 1 is completed. The processing of the shaft hole, end face and other features of the ring frame part 1 can be completed.

[0017] S5, after completing the processing of the shaft hole, end face and other features of the part, the fourth pneumatic rotary cylinder 2 of the auxiliary support is first controlled to loosen through the PLC, and then the three pneumatic rotary cylinders 2 of the main positioning are controlled to loosen to disassemble the ring frame part 1.

[0018] The present invention can realize automatic clamping of the ring frame part 1 through the cooperation of the screw stepping motor 4, the pneumatic angle cylinder 2, the monitoring feedback of the force sensor 3 and the displacement sensor 5, and the PLC control command, and can also automatically monitor the clamping deformation of the ring frame part 1, and adjust the posture of the ring frame part 1 in real time accordingly to achieve a clamping deformation of less than 0.005mm.

[0019] Figure 2 When operating the control interface shown, in order to prevent the four pneumatic swivel cylinders 2 from colliding with the ring frame part 1 during rotation, press the F3 key to control the three pneumatic swivel cylinders 2 of the main positioning to rotate into place, complete the three-point positioning and clamping of the ring frame part 1, and press the F5 key to start the displacement sensor 5 to record the value.

[0020] Press the F1 key to start the screw stepper motor 4 under the 4th clamping point. When the screw stepper motor 4 contacts the ring frame part 1 upward, Free on the display changes to Touch, the monitored force sensor 3 is greater than the set threshold, and the screw stepper motor 4 stops moving.

[0021] Press SHIFT+F4 to control the fourth auxiliary support pneumatic angle cylinder 2 to rotate into place, completing the auxiliary clamping of the ring frame part 1.

[0022] Press SHIFT+F5 to start the clamping error compensation according to the value of the displacement sensor 5, and the lead screw stepper motor 4 moves in the opposite direction until the value of the displacement sensor 5 returns to the initial position, completing the stress-free clamping of the ring frame part 1. The processing of the shaft hole, end face and other features of the ring frame part 1 can be completed.

[0023] Finally, first control the auxiliary support pneumatic angle cylinder 2 to loosen, then control the main positioning pneumatic angle cylinder 2 to loosen, and remove the ring frame part 1.

[0024] The above is only a preferred implementation of the patent of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the creative concept of the patent of the present invention, which all fall within the scope of protection of the patent of the present invention.

Claims

1. A stress-free clamping method for low-rigidity ring frame parts, characterized in that: The following steps are included S1, select the four corners of a rectangle on a fixed plane as the clamping points, install the pneumatic angular cylinder (2) and the screw stepper motor (4) respectively, install the force sensor (3) above the shaft of the screw stepper motor (4), place the displacement sensor (5) directly above the force sensor (3), and connect the pneumatic angular cylinder (2) and the screw stepper motor (4) through PLC; S2, placing the ring frame part (1) above the four pneumatic angular cylinders (2) so as to contact the probe of the displacement sensor (5), selecting three pneumatic angular cylinders (2) as the main positioning clamping points, controlling the three pneumatic angular cylinders (2) to rotate into place through PLC to complete the three-point positioning clamping of the ring frame part (1), and recording the value of the displacement sensor (5); S3, start the screw stepper motor (4) under the fourth clamping point, record the value of the force sensor (3), and the screw stepper motor (4) contacts the ring frame part (1) axially. If the value monitored by the force sensor (3) is greater than the set threshold, the screw stepper motor (4) stops moving, and the fourth pneumatic angle cylinder (2) is controlled by the PLC to rotate into place, thereby completing the auxiliary clamping of the ring frame part (1); S4, according to the value of the displacement sensor (5), the PLC drives the screw stepper motor (4) to move in the opposite direction until the value of the displacement sensor (5) returns to the initial position, completing the stress-free clamping of the ring frame part (1).

2. A stress-free clamping method for low-rigidity ring frame parts according to claim 1, characterized in that: The method further comprises the steps of first controlling the fourth pneumatic rotary cylinder (2) of the auxiliary support to be loosened through the PLC, and then controlling the three pneumatic rotary cylinders (2) of the main positioning to be loosened, so as to disassemble the ring frame part (1).

3. A stress-free clamping method for low-rigidity ring frame parts according to claim 1 or 2, characterized in that: The probe is clamped on the displacement sensor (5) via a magnetic base.

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