Drilling device for CF-PEEK material and drilling method thereof

Abstract

The invention discloses a drilling device for a CF-PEEK (Czochralski-Polyether Ether Ketone) material and a drilling method thereof. A first linear sliding table module, a second linear sliding table module, a third linear sliding table module and a fourth linear sliding table module drive a first rotating motor, a second rotating motor, a third rotating motor and a fourth rotating motor to horizontally move correspondingly, and the first rotating motor drives a drill bit to rotate; a reverse cutting edge opposite to the auxiliary cutting edge in direction is arranged on the outer edge of an L-shaped groove formed in the drill bit auxiliary cutting edge, a second rotating motor drives a first ultrasonic vibrator to rotate, the first ultrasonic vibrator drives a grinding tool to vibrate in a reciprocating mode in the axial direction, a third rotating motor drives a milling cutter to rotate, and a fourth rotating motor drives the second ultrasonic vibrator to rotate. The second ultrasonic vibrator drives the workpiece clamp to vibrate in a reciprocating mode in the direction perpendicular to the central axis of the grinding tool. According to the CF-PEEK material drilling device, the CF-PEEK material workpiece can be drilled, the drilling efficiency is high, and the hole machining quality is high.

Description

Technical Field

[0001] The invention belongs to the field of automated processing of composite materials, and in particular relates to a drilling device and a drilling method for CF-PEEK materials. Background Art

[0002] CF-PEEK material has excellent physical and mechanical properties, such as heat resistance, wear resistance, fatigue resistance, radiation resistance, peeling resistance and creep resistance. It is widely used as a special functional material in many fields such as petroleum, chemical industry, machinery, etc. It has excellent mechanical properties and heat resistance and is suitable for demanding industrial applications such as aerospace, oil pipelines, etc. It is a very important carbon fiber composite material, but due to its own non-uniformity and anisotropy and its work hardening phenomenon, it is often accompanied by defects such as tearing, burrs, and delamination during the drilling process, affecting the processing quality of the hole. At the same time, due to the high hardness of CF-PEEK material, the drilling process is prone to cause severe wear of ordinary drill bits, reducing the life of the drill bit. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a drilling device and a drilling method for CF-PEEK material.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] The invention discloses a drilling device for CF-PEEK material, comprising a frame, a drilling mechanism, an ultrasonic grinding mechanism, a milling mechanism and a workpiece clamping mechanism.

[0006] The drilling mechanism includes a rotating motor, a linear slide module, a drill bit, a coolant pipe and a nozzle; the linear slide module is horizontally fixed on the frame and drives the rotating motor and the coolant pipe to translate horizontally, the rotating motor drives the horizontally arranged drill bit to rotate, and an L-shaped groove is provided at a position of the secondary cutting edge of the drill bit near the head, and a counter cutting edge in the opposite direction of the secondary cutting edge is provided at a position of the L-shaped groove on the secondary cutting edge; the nozzle is fixed and connected to the outlet of the coolant pipe.

[0007] The ultrasonic grinding mechanism includes a rotating motor 2, a linear slide module 2 and a vibration grinding tool assembly; the linear slide module 2 parallel to the linear slide module 1 is fixed on the frame and drives the rotating motor 2 to translate horizontally; the vibration grinding tool assembly includes an ultrasonic vibrator 1 and a grinding tool, the rotating motor 2 drives the ultrasonic transducer of the ultrasonic vibrator 1 to rotate, the grinding tool is fixed on the amplitude rod of the ultrasonic vibrator 1, and the ultrasonic vibrator 1 drives the grinding tool to vibrate back and forth in the axial direction. The milling mechanism includes a rotating motor 3, a linear slide module 3 and a milling cutter; the linear slide module 3 parallel to the linear slide module 1 is fixed on the frame and drives the rotating motor 3 to translate horizontally, and the rotating motor 3 drives the milling cutter to rotate.

[0008] The workpiece clamping mechanism includes a rotating motor four, a linear slide module four and a vibration fixture; the linear slide module four, which is horizontal and perpendicular to the linear slide module one, is fixed on the frame and drives the rotating motor four to translate horizontally; the vibration fixture includes an ultrasonic vibrator two and a workpiece fixture, the rotating motor four drives the ultrasonic transducer of the ultrasonic vibrator two to rotate, the workpiece fixture is arranged on the amplitude rod of the ultrasonic vibrator two, and the ultrasonic vibrator two drives the workpiece fixture to vibrate back and forth in the direction perpendicular to the output shaft of the center axis of the grinding tool.

[0009] Among them, linear slide module one, linear slide module two and linear slide module three are arranged in sequence, and the output shafts of rotating motor one, rotating motor two, rotating motor three and rotating motor four are horizontally parallel and parallel to linear slide module one.

[0010] Preferably, the housing of the rotating motor 1 is fixed on the slide of the linear slide module 1, and the drill bit and the output shaft of the rotating motor 1 are coaxially fixed through a self-tightening drill chuck.

[0011] Preferably, the drill bit is a three-edge drill bit with three main cutting edges and three secondary cutting edges evenly distributed, and the drill bit is made of diamond; each secondary cutting edge of the drill bit is provided with an L-shaped groove near the head.

[0012] Preferably, the coolant pipe is a universal joint pipe.

[0013] Preferably, the workpiece clamp includes a base plate, bolts and clamps. The vertically arranged base plate is fixed on the amplitude rod of the ultrasonic vibrator 2. Two partitions perpendicular to the base plate and arranged in parallel are fixed at both ends of the base plate. Two baffles parallel to the base plate are fixed at one end of the two partitions away from the ultrasonic vibrator 2. A clamp parallel to the base plate is provided between each baffle and the base plate, and each clamp and the adjacent partition form a sliding pair perpendicular to the base plate. A bolt perpendicular to the base plate is provided on the outer side of each clamp, and the bolt and the hole opened on the adjacent baffle form a rotating pair, and form a threaded pair with the threaded hole opened on the adjacent clamp.

[0014] The present invention provides a CF-PEEK material drilling method, which is specifically as follows:

[0015] Step 1: Clamp the CF-PEEK material workpiece to be drilled by a workpiece fixture.

[0016] Step 2: The linear slide module 4 drives the rotating motor 4 to drive the vibration fixture and the CF-PEEK material workpiece to translate in the direction close to the linear slide module 3, so that the center of the hole to be processed on the CF-PEEK material workpiece is aligned with the drill bit, and the CF-PEEK material workpiece is translated to the drilling processing position; wherein, the vibration fixture includes an ultrasonic vibrator 2 and a workpiece fixture; then the linear slide module 1 drives the rotating motor 1 to drive the drill bit to translate in the direction close to the linear slide module 4, the rotating motor 1 drives the drill bit to rotate, the drill bit contacts the surface of the CF-PEEK material workpiece, and starts to perform preliminary drilling on the CF-PEEK material workpiece, and at the same time the water pump works, liquid nitrogen is transported to the coolant pipe, and sprayed onto the drill bit from the nozzle to cool the drill bit; after completing the preliminary drilling, the linear slide module 1 drives the rotating motor 1 to drive the drill bit to translate in the direction away from the linear slide module 4 to the initial position, and the water pump and the rotating motor 1 stop working. When the drill is performing initial drilling, the reverse cutting edge of the drill reversely cuts the burrs generated by the main cutting edge of the drill to remove the remaining burrs that cannot be removed by the main cutting edge.

[0017] Step three, linear slide module four drives rotating motor four to drive the vibration fixture and the CF-PEEK material workpiece to continue to translate in the direction close to linear slide module three, so that the center of the hole formed by the preliminary drilling in step two on the CF-PEEK material workpiece is aligned with the center of the grinding tool, and the CF-PEEK material workpiece moves to the grinding processing position; then linear slide module two drives rotating motor two to drive the vibration grinding tool assembly to translate in the direction close to linear slide module four, so that the grinding tool passes through the hole formed by the preliminary drilling, and at the same time, rotating motor two drives ultrasonic vibrator one to drive the grinding tool to rotate, and ultrasonic vibrator one drives the grinding tool to vibrate reciprocatingly along the axial direction of the grinding tool; then rotating motor four drives the vibration fixture to drive the CF-PEEK material workpiece to rotate, and ultrasonic vibrator two drives The workpiece fixture drives the CF-PEEK material workpiece to vibrate back and forth in a direction perpendicular to the central axis of the grinding tool. At the same time, the linear slide module four drives the rotating motor four to drive the vibration fixture and the CF-PEEK material workpiece to continue to translate a preset distance one in the direction close to the linear slide module three, and the grinding tool contacts the inner wall of the hole formed by the preliminary drilling, and performs grinding and hole expansion operations on the hole formed by the preliminary drilling; then, the linear slide module four stops driving the rotating motor four, the rotating motor four stops driving the vibration fixture, the ultrasonic vibrator two stops driving the workpiece fixture, and the linear slide module two drives the rotating motor two to drive the vibration grinding tool assembly to translate in the direction away from the linear slide module four to the initial position, the rotating motor two stops driving the ultrasonic vibrator one, and the ultrasonic vibrator one stops driving the grinding tool. Among them, during the grinding and reaming operations, the reciprocating vibration of the grinding tool along the axial direction of the grinding tool, and the reciprocating vibration of the CF-PEEK material workpiece in a direction perpendicular to the central axis of the grinding tool and the rotation of the CF-PEEK material workpiece form a three-dimensional rotational ultrasonic vibration grinding mode.

[0018] Step 4: Linear slide module 4 drives rotary motor 4 to drive the vibration fixture and the CF-PEEK material workpiece to continue to translate in the direction close to linear slide module 3, so that the center of the hole on the CF-PEEK material workpiece after the grinding and reaming operation in step 3 is aligned with the center of the milling cutter, and the CF-PEEK material workpiece moves to the milling processing position, and the linear slide module 4 drives rotary motor 4 to drive the vibration fixture and the CF-PEEK material workpiece to continue to translate in the direction close to the linear slide module 3 by a preset distance 2; then rotary motor 4 drives the vibration fixture to drive the CF-PEEK material workpiece to rotate, and the linear slide module 3 drives rotary motor 3 to drive the milling cutter to move close to the linear slide module The linear slide module moves in the direction of group four, and the rotary motor three drives the milling cutter to rotate. The milling cutter contacts the surface of the CF-PEEK workpiece and mills the holes after grinding and expanding. After milling, the linear slide module three drives the rotary motor three to drive the milling cutter to move in the direction away from the linear slide module four to the initial position, and the rotary motor three stops driving the milling cutter, and the rotary motor four stops driving the vibration fixture. Then the linear slide module four drives the rotary motor four to drive the vibration fixture and the CF-PEEK workpiece to move in the direction away from the linear slide module three to the initial position, and takes the CF-PEEK workpiece out of the workpiece fixture, thereby completing the processing of the hole to be processed on the CF-PEEK workpiece.

[0019] The present invention has the following beneficial effects:

[0020] 1. The present invention can realize the drilling work on the CF-PEEK material workpiece, and the drilling efficiency is high and the hole processing quality is high. Specifically, the present invention drills a CF-PEEK material workpiece through a drilling mechanism to achieve preliminary drilling of the CF-PEEK material workpiece, realizes grinding and hole expansion operations of the hole through the cooperation of an ultrasonic grinding mechanism and a workpiece clamping mechanism, and realizes milling of the hole through the cooperation of a milling mechanism and a workpiece clamping mechanism; further, during the preliminary drilling process, liquid nitrogen is sprayed from a nozzle to the contact position between the drill bit and the CF-PEEK material workpiece, thereby reducing cutting heat and avoiding the occurrence of tearing caused by the increase in local temperature of the workpiece affecting the mechanical properties of the material, and at the same time, the reverse cutting edge provided on the drill bit reversely cuts the burrs generated when the main cutting edge is cut, thereby achieving effective removal of the burrs generated when the main cutting edge is cut; during the grinding and hole expansion operations, the reciprocating vibration of the grinding tool in the axial direction and the reciprocating vibration of the CF-PEEK material workpiece in a direction perpendicular to the central axis of the grinding tool form a three-dimensional rotating ultrasonic vibration grinding mode in cooperation with the rotational motion of the CF-PEEK material workpiece, and the reciprocating vibrating grinding tool repeatedly grinds the inner wall of the hole The grinding track of the inner wall of the hole has a certain degree of overlap, which reduces the cutting force and plays a certain ironing effect on the inner wall of the hole, reduces the tearing problem caused by drilling, improves the surface roughness, and improves the surface quality of the hole. The reciprocating vibration of the CF-PEEK material workpiece makes the continuous grinding of the hole by the grinding tool change to intermittent grinding, reduces the axial cutting force of the grinding tool, and avoids the phenomenon of debonding and separation of adjacent ply materials due to excessive axial cutting force causing the interlayer load of the CF-PEEK material to exceed its bonding strength. -The coordination of the rotational motion of the PEEK material workpiece and the reciprocating vibration of the CF-PEEK material workpiece promotes the removal effect of the CF-PEEK material workpiece, improves the grinding efficiency, and thus improves the drilling efficiency; during milling, the main motion of the milling cutter is the rotational motion of the milling cutter, and the main cutting force is the component force acting in the tangential direction of the milling cutter circle. The axial cutting force is small, which avoids the occurrence of stratification of the CF-PEEK material workpiece, and at the same time reduces the drilling defects, stratification defects and drilling defects during drilling, and improves the surface quality and machining accuracy of the hole.

[0021] 2. The present invention adopts the optimal processing procedure of drilling first, grinding second and milling last. If the processing sequence is changed to drilling first, milling second and grinding last, the delamination problem caused by drilling may be solved by milling, but it increases the burr and tearing problems of the hole, and the material delamination problem caused by the subsequent grinding process needs to be re-milled. Therefore, the processing procedure of drilling first, grinding second and milling last can effectively reduce the complexity of the processing process and ensure the processing accuracy of the hole.

[0022] 3. The drill bit of the present invention adopts a three-edge drill bit with three main cutting edges, so that the feed amount of each main cutting edge is small, which further reduces the heat and pressure concentration in the drilling process, reduces the possibility of tearing, and reduces the risk of drill bit wear and breakage, thereby increasing the service life of the drill bit. In addition, the uniform distribution of the three cutting edges is conducive to maintaining the straightness and roundness of the drill hole, avoiding burrs caused by uneven cutting force, so that the entrance quality and exit quality are better, thereby improving the processing quality of the hole; in addition, the drill bit is made of diamond, which makes the three-edge drill bit hard, further improves the drilling efficiency, and further reduces the risk of drill bit wear and breakage during the drilling process, thereby increasing the service life of the drill bit.

[0023] 4. In the present invention, the hole expansion function is separated from the grinding function, so that the hole expansion function is realized by the rotation of the workpiece itself and the slow movement of the workpiece perpendicular to the feed direction, thereby ensuring the efficiency and accuracy of the hole expansion while maximizing the grinding function. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a structural schematic diagram of the drilling mechanism in the present invention;

[0026] Figure 3 The structure of the top of the drill bit in the present invention is schematically shown. Figure 1 ;

[0027] Figure 4 The structure of the top of the drill bit in the present invention is schematically shown. Figure 2 ;

[0028] Figure 5 It is a structural schematic diagram of the ultrasonic grinding mechanism in the present invention;

[0029] Figure 6 It is a structural schematic diagram of the milling mechanism in the present invention;

[0030] Figure 7 It is a structural schematic diagram of the workpiece clamping mechanism in the present invention. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with the accompanying drawings.

[0032] like Figure 1 As shown, the present invention provides a drilling device for CF-PEEK material, comprising a frame 101, a drilling mechanism 102, an ultrasonic grinding mechanism 103, a milling mechanism 104 and a workpiece clamping mechanism 105.

[0033] like Figure 2 , Figure 3 and Figure 4 As shown, the drilling mechanism 102 includes a rotating motor 201, a linear slide module 202, a drill bit 204, a coolant pipe 205 and a nozzle; the linear slide module 202 is horizontally fixed on the frame 101, and drives the rotating motor 201 and the coolant pipe 205 to translate horizontally, the rotating motor 201 drives the horizontally arranged drill bit 204 to rotate, and each secondary cutting edge 2041 of the drill bit 204 is provided with an L-shaped groove 2042 near the head position, and the L-shaped groove 2042 is located on the secondary cutting edge 2041. The position of the counter cutting edge opposite to the secondary cutting edge 2041 is provided, and the generated burrs are also reversely cut while drilling, which can effectively remove the residual burrs that cannot be removed by the main cutting edge; the nozzle is fixed and connected to the outlet of the coolant pipe 205, and is located on the outside of the drill bit 204.

[0034] like Figure 5 As shown, the ultrasonic grinding mechanism 103 includes a rotating motor 2 301, a linear slide module 2 302 and a vibration grinding tool assembly 303; the linear slide module 2 302 parallel to the linear slide module 1 202 is fixed on the frame 101, and drives the rotating motor 2 301 to translate horizontally; the vibration grinding tool assembly 303 includes an ultrasonic vibrator 1 and a grinding tool, the rotating motor 2 301 drives the ultrasonic transducer of the ultrasonic vibrator 1 to rotate, the grinding tool is fixed on the amplitude rod of the ultrasonic vibrator 1, and the ultrasonic vibrator 1 drives the grinding tool to vibrate reciprocatingly in the axial direction.

[0035] like Figure 6 As shown, the milling mechanism 104 includes a rotating motor 3 401, a linear slide module 3 402 and a milling cutter 403; the linear slide module 3 402 parallel to the linear slide module 1 202 is fixed on the frame 101, and drives the rotating motor 3 401 to translate horizontally, and the rotating motor 3 401 drives the milling cutter 403 to rotate.

[0036] like Figure 7 As shown, the workpiece clamping mechanism 105 includes a rotating motor 4 501, a linear slide module 4 502 and a vibration fixture 503; the linear slide module 4 502, which is horizontally and perpendicular to the linear slide module 1 202, is fixed on the frame 101, and drives the rotating motor 4 501 to translate horizontally; the vibration fixture 503 includes an ultrasonic vibrator 2 and a workpiece fixture, the rotating motor 4 501 drives the ultrasonic transducer of the ultrasonic vibrator 2 to rotate, the workpiece fixture is arranged on the amplitude rod of the ultrasonic vibrator 2, and the ultrasonic vibrator 2 drives the workpiece fixture to vibrate reciprocatingly in a direction perpendicular to the central axis of the grinding tool.

[0037] Among them, the linear slide module 1 202, the linear slide module 2 302 and the linear slide module 3 402 are arranged in sequence, the output shafts of the rotating motor 1 201, the rotating motor 2 301, the rotating motor 3 401 and the rotating motor 4 501 are horizontally parallel and parallel to the linear slide module 1 202, and the output shafts of the rotating motor 1 201, the rotating motor 2 301 and the rotating motor 3 401 and the output shaft of the rotating motor 4 501 are all arranged inwardly.

[0038] As a preferred embodiment, the housing of the rotary motor 201 is fixed on the slide of the linear slide module 202, and the drill bit 204 and the output shaft of the rotary motor 201 are coaxially fixed through a self-tightening drill chuck 203.

[0039] As a preferred embodiment, the drill bit 204 adopts a three-edge drill bit with three main cutting edges, so that the feed amount of each main cutting edge is small, which reduces the heat and pressure concentration during the drilling process, thereby reducing the risk of drill bit wear and breakage, and improving the service life of the drill bit. In addition, the uniform distribution of the three main cutting edges is also conducive to maintaining the straightness and roundness of the drill hole, so that the entrance quality and exit quality are both good, with fewer burrs at the entrance and exit, thereby improving the processing quality of the hole. The drill bit is made of diamond, which makes the three-edge drill bit hard, further reducing the risk of drill bit wear and breakage during the drilling process, and further improving the service life of the drill bit.

[0040] As a preferred embodiment, the coolant pipe 205 adopts a universal joint guide tube, which can realize liquid nitrogen spraying in any direction.

[0041] As a preferred embodiment, the workpiece clamp includes a base plate, bolts and clamps. The vertically arranged base plate is fixed on the amplitude rod of the ultrasonic vibrator 2. Two partitions perpendicular to the base plate and arranged in parallel are fixed at both ends of the base plate. Two baffles parallel to the base plate are fixed at one end of the two partitions away from the ultrasonic vibrator 2. A clamp parallel to the base plate is provided between each baffle and the base plate, and each clamp and the adjacent partition form a sliding pair perpendicular to the base plate. A bolt perpendicular to the base plate is provided on the outer side of each clamp, and the bolt and the hole opened on the adjacent baffle form a rotating pair, and form a threaded pair with the threaded hole opened on the adjacent clamp.

[0042] Among them, linear slide module 1 202, linear slide module 2 302, linear slide module 3 402, linear slide module 4 502, rotating motor 1 201, rotating motor 2 301, rotating motor 3 401, rotating motor 4 501, ultrasonic vibrator 1 and ultrasonic vibrator 2 are all controlled by the controller.

[0043] The present invention provides a CF-PEEK material drilling method, which is specifically as follows:

[0044] Step 1: Clamp the CF-PEEK material workpiece to be drilled by the workpiece fixture, and connect the inlet of the coolant pipe 205 to the box filled with liquid nitrogen through the water pump. In the initial state, the rotating motor 1 201 is located on the linear slide module 1 202, away from the end B1 of the linear slide module 4 502, the rotating motor 2 301 is located on the linear slide module 2 302, away from the end B2 of the linear slide module 4 502, the rotating motor 3 401 is located on the linear slide module 3 402, away from the end B3 of the linear slide module 4 502, and the rotating motor 4 501 is located on the linear slide module 4 502, close to the end A0 of the linear slide module 1 202.

[0045] Step 2: The linear slide module 4 502 drives the rotating motor 4 501 to drive the vibration fixture 503 and the CF-PEEK material workpiece to translate in the direction close to the linear slide module 3 402, so that the center of the hole to be processed on the CF-PEEK material workpiece is aligned with the drill bit 204, and the CF-PEEK material workpiece is translated to the drilling processing position; then the linear slide module 1 202 drives the rotating motor 1 201 to drive the drill bit 204 to translate in the direction close to the linear slide module 4 502, and the rotating motor 1 201 drives the drill The drill head 204 rotates, the drill bit 204 contacts the surface of the CF-PEEK material workpiece, and starts to drill the CF-PEEK material workpiece. At the same time, the water pump works, and liquid nitrogen is transported to the coolant pipe 205 and sprayed from the nozzle onto the drill bit 204 to cool the drill bit 204. After completing the preliminary drilling, the linear slide module 1 202 drives the rotary motor 1 201 to drive the drill bit 204 to move in a direction away from the linear slide module 4 502 to the initial position, and the water pump and the rotary motor 1 201 stop working. When the drill bit 204 performs preliminary drilling, the reverse cutting edge of the drill bit 204 reversely cuts the burrs generated by the main cutting edge of the drill bit 204 to remove the remaining burrs that cannot be removed by the main cutting edge.

[0046] Step three, the linear slide module four 502 drives the rotating motor four 501 to drive the vibration fixture 503 and the CF-PEEK material workpiece to continue to translate in the direction close to the linear slide module three 402, so that the center of the hole formed by the preliminary drilling in step two on the CF-PEEK material workpiece is aligned with the center of the grinding tool, and the CF-PEEK material workpiece moves to the grinding processing position; then the linear slide module two 302 drives the rotating motor two 301 to drive the vibration grinding tool assembly 303 to translate in the direction close to the linear slide module four 502, so that the grinding tool passes through the hole formed by the preliminary drilling, and at the same time, the rotating motor two 301 drives the ultrasonic vibrator one to drive the grinding tool to rotate, and the ultrasonic vibrator one drives the grinding tool to vibrate reciprocatingly along the axial direction of the grinding tool; then the rotating motor four 501 drives the vibration fixture 503 to drive the CF-PEEK material workpiece to rotate, and the ultrasonic vibrator two drives the workpiece fixture to drive the CF-PEEK material The workpiece vibrates back and forth in a direction perpendicular to the central axis of the grinding tool. At the same time, the linear slide module four 502 drives the rotating motor four 501 to drive the vibration fixture 503 and the CF-PEEK material workpiece to continue to slowly translate a preset distance one (the difference between the radius of the hole after the required grinding and expansion and the radius of the grinding tool) in the direction close to the linear slide module three 402. The grinding tool contacts the inner wall of the hole formed by the preliminary drilling, and performs grinding and expansion operations on the hole formed by the preliminary drilling; then, the linear slide module four 502 stops driving the rotating motor four, the rotating motor four 501 stops driving the vibration fixture 503, the ultrasonic vibrator two stops driving the workpiece fixture, and the linear slide module two 302 drives the rotating motor two 301 to drive the vibration grinding tool assembly 303 to translate to the initial position in the direction away from the linear slide module four 502, the rotating motor two 301 stops driving the ultrasonic vibrator one, and the ultrasonic vibrator one stops driving the grinding tool. Among them, when performing grinding and reaming operations, the reciprocating vibration of the grinding tool along the axial direction of the grinding tool, and the reciprocating vibration of the CF-PEEK material workpiece in a direction perpendicular to the central axis of the grinding tool and the rotation of the CF-PEEK material workpiece form a three-dimensional rotational ultrasonic vibration grinding mode. The reciprocating vibration of the grinding tool along the axial direction of the grinding tool makes the grinding trajectory of the grinding tool on the inner wall of the hole overlap to a certain extent, so that the hole is repeatedly ground during the advancement of the grinding tool, which has a certain ironing effect on the inner wall of the hole, reducing the tearing problem caused by drilling. The reciprocating vibration of the CF-PEEK material workpiece in a direction perpendicular to the axial direction of the grinding tool transforms the continuous grinding of the hole by the grinding tool into intermittent grinding, greatly reducing the axial cutting force and avoiding the occurrence of stratification to a large extent. In addition, the rotation of the CF-PEEK material workpiece and the reciprocating vibration of the CF-PEEK material workpiece promote the removal effect of the CF-PEEK material workpiece, thereby improving the grinding efficiency.

[0047] Step 4, the linear slide module 4 502 drives the rotating motor 4 501 to drive the vibration fixture 503 and the CF-PEEK material workpiece to continue to translate in the direction close to the linear slide module 3 402, so that the center of the hole on the CF-PEEK material workpiece after the grinding and reaming operation in step 3 is aligned with the center of the milling cutter, and the CF-PEEK material workpiece moves to the milling processing position, and then, the linear slide module 4 502 drives the rotating motor 4 501 to drive the vibration fixture 503 and the CF-PEEK material workpiece to continue to translate in the direction close to the linear slide module 3 402 by a preset distance 2 (the difference between the required hole radius after milling and the milling cutter radius); then the rotating motor 4 501 drives the vibration fixture 503 to drive the CF-PEEK material workpiece to rotate, and the linear slide module 3 402 drives the rotating motor 3 401 to drive the milling cutter 403 in the direction close to the linear slide module 4 502 Translation, the rotating motor three 401 drives the milling cutter 403 to rotate, the milling cutter 403 contacts the surface of the CF-PEEK material workpiece, and mills the hole after grinding and expansion, so that the hole diameter reaches the target accuracy, and at the same time the inner wall of the hole meets the target hole surface quality; after completing the milling, the linear slide module three 402 drives the rotating motor three 401 to drive the milling cutter 403 to translate to the initial position in the direction away from the linear slide module four 502, the rotating motor three 401 stops driving the milling cutter 403, and the rotating motor four 501 stops driving the vibration fixture 503; then the linear slide module four 502 drives the rotating motor four 501 to drive the vibration fixture 503 and the CF-PEEK material workpiece to translate to the initial position in the direction away from the linear slide module three 402, and takes out the CF-PEEK material workpiece from the workpiece fixture, thereby completing the processing of the hole to be processed on the CF-PEEK material workpiece.

Claims

1. A drilling device for CF-PEEK material, comprising a frame, a drilling mechanism, a milling mechanism and a workpiece clamping mechanism, characterized in that: It also includes an ultrasonic grinding mechanism; the drilling mechanism includes a rotating motor, a linear slide module, a drill bit, a coolant pipe and a nozzle; the linear slide module is horizontally fixed on the frame and drives the rotating motor and the coolant pipe to translate horizontally, the rotating motor drives the horizontally arranged drill bit to rotate, and the secondary cutting edge of the drill bit is provided with an L-shaped groove near the head position, and the position of the L-shaped groove on the secondary cutting edge is provided with a counter cutting edge in the opposite direction to the secondary cutting edge; the nozzle is fixed and connected to the outlet of the coolant pipe; The ultrasonic grinding mechanism includes a rotating motor 2, a linear slide module 2 and a vibration grinding tool assembly; the linear slide module 2 parallel to the linear slide module 1 is fixed on the frame and drives the rotating motor 2 to translate horizontally; the vibration grinding tool assembly includes an ultrasonic vibrator 1 and a grinding tool, the rotating motor 2 drives the ultrasonic transducer of the ultrasonic vibrator 1 to rotate, the grinding tool is fixed on the amplitude rod of the ultrasonic vibrator 1, and the ultrasonic vibrator 1 drives the grinding tool to vibrate reciprocatingly in the axial direction; the milling mechanism includes a rotating motor 3, a linear slide module 3 and a milling cutter; the linear slide module 3 parallel to the linear slide module 1 is fixed on the frame and drives the rotating motor 3 to translate horizontally, and the rotating motor 3 drives the milling cutter to rotate; The workpiece clamping mechanism includes a rotating motor 4, a linear slide module 4 and a vibration fixture; the linear slide module 4, which is horizontal and perpendicular to the linear slide module 1, is fixed on the frame and drives the rotating motor 4 to translate horizontally; the vibration fixture includes an ultrasonic vibrator 2 and a workpiece fixture, the rotating motor 4 drives the ultrasonic transducer of the ultrasonic vibrator 2 to rotate, the workpiece fixture is arranged on the amplitude rod of the ultrasonic vibrator 2, and the ultrasonic vibrator 2 drives the workpiece fixture to vibrate back and forth in a direction perpendicular to the central axis of the grinding tool; Among them, linear slide module one, linear slide module two and linear slide module three are arranged in sequence, and the output shafts of rotating motor one, rotating motor two, rotating motor three and rotating motor four are horizontally parallel and parallel to linear slide module one.

2. A drilling device for CF-PEEK material according to claim 1, characterized in that: The housing of the rotating motor 1 is fixed on the slide of the linear slide module 1, and the drill bit and the output shaft of the rotating motor 1 are coaxially fixed through a self-tightening drill chuck.

3. A drilling device for CF-PEEK material according to claim 1, characterized in that: The drill bit is a three-edge drill bit with three main cutting edges and three auxiliary cutting edges evenly distributed, and the drill bit is made of diamond; each auxiliary cutting edge of the drill bit is provided with an L-shaped groove near the head.

4. A drilling device for CF-PEEK material according to claim 1, characterized in that: The coolant pipe adopts a universal joint guide tube.

5. A drilling device for CF-PEEK material according to claim 1, characterized in that: The workpiece clamp includes a base plate, bolts and clamps. The vertically arranged base plate is fixed on the amplitude rod of the second ultrasonic vibrator. Two partitions perpendicular to the base plate and arranged in parallel are fixed at both ends of the base plate. Two baffles parallel to the base plate are fixed at one end of the two partitions away from the second ultrasonic vibrator. A clamp parallel to the base plate is provided between each baffle and the base plate, and each clamp and the adjacent partition form a sliding pair perpendicular to the base plate. Bolts perpendicular to the base plate are provided on the outer side of each clamp, and the bolts and the holes opened on the adjacent baffles form a rotating pair, and form a threaded pair with the threaded holes opened on the adjacent clamps.

6. A CF-PEEK material drilling method, characterized in that: The details are as follows: Step 1: Clamp the CF-PEEK material workpiece to be drilled by a workpiece fixture; Step 2: The linear slide module 4 drives the rotating motor 4 to drive the vibration fixture and the CF-PEEK material workpiece to translate in a direction close to the linear slide module 3, so that the center of the hole to be processed on the CF-PEEK material workpiece is aligned with the drill bit, and the CF-PEEK material workpiece is translated to the drilling processing position; wherein, the vibration fixture includes an ultrasonic vibrator 2 and a workpiece fixture; then the linear slide module 1 drives the rotating motor 1 to drive the drill bit to translate in a direction close to the linear slide module 4, and the rotating motor 1 drives the drill bit to rotate, and the drill bit and the CF-PEEK material workpiece are translated. The surface is contacted, and preliminary drilling of the CF-PEEK material workpiece begins. At the same time, the water pump works, and liquid nitrogen is transported to the coolant pipe and sprayed from the nozzle onto the drill bit to cool the drill bit. After the preliminary drilling is completed, the linear slide module 1 drives the rotary motor 1 to drive the drill bit to move horizontally in a direction away from the linear slide module 4 to the initial position, and the water pump and the rotary motor 1 stop working. Among them, when the drill bit performs preliminary drilling, the reverse cutting edge of the drill bit reversely cuts the burrs generated by the main cutting edge of the drill bit to remove the remaining burrs that cannot be removed by the main cutting edge. Step three, linear slide module four drives rotating motor four to drive the vibration fixture and the CF-PEEK material workpiece to continue to translate in the direction close to linear slide module three, so that the center of the hole formed by the preliminary drilling in step two on the CF-PEEK material workpiece is aligned with the center of the grinding tool, and the CF-PEEK material workpiece moves to the grinding processing position; then linear slide module two drives rotating motor two to drive the vibration grinding tool assembly to translate in the direction close to linear slide module four, so that the grinding tool passes through the hole formed by the preliminary drilling, and at the same time, rotating motor two drives ultrasonic vibrator one to drive the grinding tool to rotate, and ultrasonic vibrator one drives the grinding tool to vibrate back and forth along the axial direction of the grinding tool; then rotating motor four drives the vibration fixture to drive the CF-PEEK material workpiece to rotate, and ultrasonic vibrator two drives the workpiece fixture to drive the CF-PEEK material workpiece to vibrate back and forth in a direction perpendicular to the central axis of the grinding tool, and at the same time, linear slide module four drives rotating motor one to drive the vibration grinding tool assembly to move in the direction close to the linear slide module four. Rotating motor 4 drives the vibration fixture and the CF-PEEK material workpiece to continue to translate a preset distance one in the direction close to linear slide module 3, and the grinding tool contacts the inner wall of the hole formed by the preliminary drilling, and performs grinding and hole expansion operations on the hole formed by the preliminary drilling; then, linear slide module 4 stops driving rotating motor 4, rotating motor 4 stops driving the vibration fixture, ultrasonic vibrator 2 stops driving the workpiece fixture, and linear slide module 2 drives rotating motor 2 to drive the vibration grinding tool assembly to translate in the direction away from linear slide module 4 to the initial position, rotating motor 2 stops driving ultrasonic vibrator 1, and ultrasonic vibrator 1 stops driving the grinding tool; wherein, during the grinding and hole expansion operations, the reciprocating vibration of the grinding tool along the axial direction of the grinding tool, and the reciprocating vibration of the CF-PEEK material workpiece in a direction perpendicular to the central axis of the grinding tool and the rotation of the CF-PEEK material workpiece form a three-dimensional rotational ultrasonic vibration grinding mode; Step 4: Linear slide module 4 drives rotary motor 4 to drive the vibration fixture and the CF-PEEK material workpiece to continue to translate in the direction close to linear slide module 3, so that the center of the hole on the CF-PEEK material workpiece after the grinding and reaming operation in step 3 is aligned with the center of the milling cutter, and the CF-PEEK material workpiece moves to the milling processing position, and the linear slide module 4 drives rotary motor 4 to drive the vibration fixture and the CF-PEEK material workpiece to continue to translate in the direction close to the linear slide module 3 by a preset distance 2; then rotary motor 4 drives the vibration fixture to drive the CF-PEEK material workpiece to rotate, and the linear slide module 3 drives rotary motor 3 to drive the milling cutter to move close to the linear slide module The linear slide module moves in the direction of group four, and the rotary motor three drives the milling cutter to rotate. The milling cutter contacts the surface of the CF-PEEK workpiece and mills the holes after grinding and expanding. After milling, the linear slide module three drives the rotary motor three to drive the milling cutter to move in the direction away from the linear slide module four to the initial position, and the rotary motor three stops driving the milling cutter, and the rotary motor four stops driving the vibration fixture. Then the linear slide module four drives the rotary motor four to drive the vibration fixture and the CF-PEEK workpiece to move in the direction away from the linear slide module three to the initial position, and takes the CF-PEEK workpiece out of the workpiece fixture, thereby completing the processing of the hole to be processed on the CF-PEEK workpiece.

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