A multifunctional milling cutter for spot drilling and chamfering

Abstract

The present application relates to the technical field of milling equipment, in particular to a multifunctional milling cutter with fixed-point drilling and chamfering, which comprises a shell, a milling cutter rod, a drill bit and a distance adjusting mechanism. The present application highly concentrates the processes of fixed-point drilling and chamfering, and the drilling depth can be adjusted according to the requirements. After single clamping, the drilling and chamfering machining work of different depths can be completed. The present application eliminates the time for tool changing, repositioning and tool setting, and has higher machining efficiency. The coaxiality error is eliminated in the present application, and the drill bit overhang of the present application is shorter when machining deep holes, so vibration is not easy to occur, and the present application has higher machining precision. A cooling flow channel is arranged in the milling cutter rod to cool the milling cutter rod and the drill bit. The cooling flow channel is connected with an auxiliary flow channel, the cooling liquid enters the cooling flow channel through the auxiliary flow channel, the pressure of the cooling liquid when sprayed is increased, and the cooling effect is optimized. The cooling liquid is sprayed to the chip pocket through the auxiliary flow channel extending out of the shell, and the auxiliary chip is discharged from the drill hole.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of milling equipment, in particular to a multifunctional milling cutter integrating fixed-point drilling and chamfering. BACKGROUND

[0002] The milling cutter is the core executive component of the milling equipment such as numerical control milling machine and machining center, which performs various forms of cutting processing on the workpiece through rotary motion, such as plane milling, cavity milling, contour milling and hole processing. The conventional end milling cutter is usually composed of a cutter body, a peripheral edge and an end edge. The end edge is responsible for axial feeding cutting and mainly undertakes the functions of centering, undercutting and forming an initial hole through axial milling; while the peripheral edge is responsible for radial cutting and is used for expanding the hole diameter or milling the side wall. In order to solve the chamfering or deburring requirements of a specific orifice, a special chamfering milling cutter has been derived in the prior art, and the cutting edge type thereof is usually designed to be a specific angle to mill the required chamfering surface at the orifice. In the occasion where drilling and orifice chamfering need to be continuously completed, the operator needs to use a center drill, a drill and a chamfering cutter respectively, first uses the center drill to process a positioning hole at the drilling position, then uses the twist drill to drill the workpiece, and finally uses the chamfering cutter to chamfer the orifice of the drilled hole. In the machining process, multiple tool changes, re-clamping and tool setting are required, which has the problem of low efficiency, and the machining accuracy is reduced due to repeated positioning errors.

[0003] In order to solve the above problems, the Chinese patent with publication number CN217018742U provides a center drill integrating fixed-point chamfering, which can complete the fixed-point and chamfering work at one time, but the above-mentioned patent is only suitable for the machining of fixed-length holes and cannot flexibly adapt to the drilling requirements of different depths. The Chinese patent with publication number CN223146082U provides a deep hole machining combined cutter, which completes the machining of chamfering while machining the deep hole, and can also adjust the position of the chamfering blade according to the depth of the hole cavity, but the above-mentioned patent has the problem of inaccurate positioning, hole diameter deviation or poor hole wall quality when machining the deep hole because the cutter overhangs too long and is prone to vibration during the initial drilling stage. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a multifunctional milling cutter integrating fixed-point drilling and chamfering, which solves the problems of low work efficiency caused by frequent tool changes during drilling and chamfering in the prior art, low machining accuracy caused by coaxiality errors during repositioning, and poor machining accuracy caused by vibration of the cutter during machining of deep holes.

[0005] The multifunctional milling cutter integrating fixed-point drilling and chamfering of the present application adopts the following technical scheme, which comprises:

[0006] The shell extends in the vertical direction, the upper end is a connecting end, and the lower end is provided with a first chamfering milling cutter edge;

[0007] The milling bar is coaxial with the shell and movably inserted into the shell along its own axis; at least two chip grooves are uniformly distributed on the peripheral wall of the milling bar in the circumferential direction, and the chip grooves are in a spiral shape;

[0008] The drill bit is fixedly connected to the end of the milling bar away from the shell, and at least two cutting edges are arranged on the end of the drill bit away from the shell, the number of the cutting edges is consistent with the number of the chip grooves, and the plurality of cutting edges intersect at one point.

[0009] The distance adjusting mechanism is used to adjust the length of the milling bar extending out of the shell.

[0010] Optionally, the distance adjusting mechanism comprises an adjusting ring and a spring; the adjusting ring is sleeved on the milling bar and fixedly connected to the upper end of the milling bar, the milling bar is sealingly connected to the inner wall of the shell through the adjusting ring; the upper surface of the adjusting ring, the upper surface of the milling bar and the upper inner wall of the shell define a liquid storage cavity, the liquid storage cavity is communicated with a liquid supply pipe, and the liquid storage cavity is filled with liquid; the spring is sleeved on the milling bar and located in the shell, the upper end of the spring abuts against the adjusting ring, and the lower end of the spring abuts against the shell; the spring makes the adjusting ring have a tendency to move away from the first chamfer milling edge.

[0011] Optionally, the liquid filled in the liquid storage cavity is cooling liquid, the milling bar is provided with a cooling flow channel penetrating upward and downward, the cooling flow channel is in a spiral shape, the upper end of the cooling flow channel is communicated with the liquid storage cavity, and the lower end of the cooling flow channel is arranged on the drill bit.

[0012] Optionally, a plurality of through holes penetrating upward and downward are uniformly arranged on the adjusting ring in the circumferential direction; the inner part of the shell is fixedly connected with a partition plate; the inner part of the shell above the partition plate is hollow, the upper surface of the partition plate, the lower surface of the adjusting ring and the peripheral wall of the shell define a supplement cavity; a plurality of auxiliary flow channels are arranged in the inner part of the end of the milling bar away from the drill bit; the plurality of auxiliary flow channels are distributed in the extension direction of the chip groove at intervals; the end of the auxiliary flow channel away from the drill bit is communicated with the chip groove, and the end of the auxiliary flow channel close to the drill bit is communicated with the cooling flow channel.

[0013] Optionally, a plurality of auxiliary flow channels are arranged in the inner part of the end of the milling bar close to the drill bit; the plurality of auxiliary flow channels are distributed in the extension direction of the chip groove at intervals; the upper end of the auxiliary flow channel is communicated with the chip groove, and the lower end of the auxiliary flow channel is communicated with the cooling flow channel.

[0014] Optionally, the shell is provided with a stroke adjusting assembly for limiting the maximum stroke of the axial movement of the drill bit relative to the shell.

[0015] Optionally, the stroke adjusting assembly comprises a sliding groove, a fastening groove and a fastening bolt; the sliding groove and the fastening groove are in a spiral shape, and the spiral directions and the pitches of the sliding groove and the fastening groove are consistent; the sliding groove is arranged in the shell and penetrates the shell inward and outward; the fastening groove is arranged on the outer wall of the milling bar; the width of the sliding groove is greater than the diameter of the fastening bolt; the fastening bolt penetrates the sliding groove and is screwed into the fastening groove to realize fastening.

[0016] Optionally, the stroke adjusting assembly further comprises a moving ring; the moving ring is rotatably and axially movably mounted outside the housing; a through hole is formed in the moving ring and extends from the inside to the outside; the fastening bolt penetrates the moving ring and the sliding slot from the outside to the inside in sequence; the fastening bolt is screwed into the fastening groove to realize fastening; a lock washer is mounted between the fastening bolt and the moving ring; and a scale is arranged on the outer wall of the housing.

[0017] Optionally, the diameter of the milling cutter rod is smaller than the diameter of the drill bit, and the drill bit is provided with a second chamfer milling cutter edge at the end close to the housing.

[0018] Optionally, the first chamfer milling cutter edge and the second chamfer milling cutter edge are both multi-blade structures.

[0019] The present application has the following advantages: the multifunctional milling cutter for fixed-point drilling and chamfering integrates the fixed-point, drilling and chamfering processes, and the operator can complete the drilling and chamfering work after single clamping, thereby saving the time for changing tools, repositioning and tool setting, and having higher processing efficiency; the milling cutter rod is coaxially arranged in the housing, and the drilling and chamfering milling can be performed on the same rotation axis, thereby fundamentally eliminating the coaxiality error, ensuring the processing quality of the workpiece, solving the problem of error caused by repositioning, and having higher processing precision.

[0020] Further, the cooling flow channel is arranged in the milling cutter rod, the milling cutter rod and the drill bit are cooled by the cooling liquid, the auxiliary flow channel is communicated with the cooling flow channel, the cooling liquid in the supplement cavity enters the cooling flow channel through the auxiliary flow channel, and the pressure of the cooling liquid when sprayed from the drill bit is increased, so that the cooling effect on the drill bit is optimized.

[0021] Further, the stroke adjusting assembly is arranged, the maximum axial movement stroke of the milling cutter rod relative to the housing can be accurately limited according to the processing requirement before drilling, the controllability of the processing process is improved by mechanical limiting, the problem of over-drilling caused by hydraulic overstroke or spring fatigue is solved, and the accurate control of the drilling depth is realized. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only need to be some embodiments of the present application, and for ordinary skilled in the art, other drawings can be obtained without creative labor based on these drawings.

[0023] Figure 1 The overall structure schematic diagram of the multifunctional milling cutter for fixed-point drilling and chamfering;

[0024] Figure 2 The side view of the multifunctional milling cutter for fixed-point drilling and chamfering;

[0025] Figure 3 The cross-sectional view of the multifunctional milling cutter for fixed-point drilling and chamfering;

[0026] Figure 4 The Figure 3 The enlarged view of X in the middle;

[0027] Figure 5 The structure schematic diagram of the milling cutter rod in the multifunctional milling cutter for fixed-point drilling and chamfering.

[0028] In the figure: 100, the shell; 101, the first chamfering milling cutter edge; 110, the partition plate; 120, the supplementary cavity; 130, the auxiliary flow channel; 140, the scale;

[0029] 200, the milling cutter rod; 210, the chip groove; 220, the cooling flow channel;

[0030] 300, the drill bit; 310, the cutting edge; 320, the second chamfering milling cutter edge;

[0031] 400, the distance adjusting mechanism; 410, the adjusting ring; 420, the spring; 430, the liquid storage cavity;

[0032] 500, the stroke adjusting assembly; 510, the sliding groove; 520, the fastening groove; 530, the fastening bolt; 540, the moving ring; 550, the anti-loosening washer. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be described clearly and completely below with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary skilled in the art without creative labor belong to the protection scope of the present application.

[0034] As Figures 1 to 5As shown, the application provides a multifunctional milling cutter with spot drilling and chamfering integrated, which comprises a shell 100, a milling cutter rod 200, a drill bit 300 and a distance adjusting mechanism 400.

[0035] The shell 100 extends along the vertical direction, the upper end is a connecting end, and the lower end is provided with a first chamfering milling cutter edge 101.

[0036] The milling cutter rod 200 is coaxial with the shell 100 and movably inserted into the shell 100 along its own axis; at least two chip grooves 210 are uniformly distributed on the peripheral wall of the milling cutter rod 200 in the circumferential direction, and the chip grooves 210 are in a spiral shape.

[0037] The drill bit 300 is fixedly connected to the end of the milling cutter rod 200 away from the shell 100, and at least two cutting edges 310 are arranged on the end of the drill bit 300 away from the shell 100, the number of the cutting edges 310 is consistent with the number of the chip grooves 210, and the plurality of cutting edges 310 intersect at a point.

[0038] The distance adjusting mechanism 400 is used to adjust the length of the milling cutter rod 200 extending out of the shell 100.

[0039] When drilling, the shell 100 is fixed on the machine tool, the machine tool drives the shell 100 and the milling cutter rod 200 to the position where the hole is needed to be punched, after positioning, the machine tool drives the shell 100 to feed while rotating around its own axis, the shell 100 drives the drill bit 300 to feed and rotate around its own axis synchronously; after the intersection point of the plurality of cutting edges 310 contacts the workpiece, the cutting edges 310 cut the workpiece surface along with the feeding and rotating of the drill bit 300, a positioning point is punched, and the positioning work is completed; then the drill bit 300 continues to feed and rotate to drill the hole in the workpiece; since the plurality of cutting edges 310 intersect at a point, there is no cross edge at the end of the twist drill in the prior art, so the cutting edges 310 directly cut the workpiece after contacting the workpiece, instead of extruding the workpiece like the cross edge, therefore, after the positioning is completed, the milling cutter rod 200 will not deviate when the drilling starts, ensuring the accuracy of the drilling.

[0040] When the shell 100 feeds by a preset distance, the shell 100 stops feeding and only rotates around its own axis, the shell 100 drives the milling cutter rod 200 to rotate synchronously; the milling cutter rod 200 rotates and moves relative to the workpiece to complete the drilling work on the workpiece through the distance adjusting mechanism 400; when the drilling depth reaches the requirement, the distance adjusting mechanism 400 is closed, the shell 100 and the milling cutter rod 200 only rotate relative to the workpiece, at this time, the first chamfering milling cutter edge 101 is not in contact with the workpiece, but the lower edge of the first chamfering milling cutter edge 101 is located in the drilled hole, and the outer edge is suspended above the upper surface of the workpiece.

[0041] At this time, the shell 100 can be moved by the machine tool to the workpiece by a preset distance, so that the first chamfering milling cutter edge 101 is in contact with the upper surface of the workpiece, and the first chamfering milling cutter edge 101 rotates around its own axis while moving axially, to remove burrs generated by drilling, and complete the chamfering milling of the hole.

[0042] The milling cutter bar 200 can also be moved by the machine tool along the radial direction of the hole by a preset distance, and the machine tool rotates the milling cutter bar 200 while self-rotating, so as to complete the chamfering milling of the hole on the premise of ensuring that the drilling depth is unchanged.

[0043] The multifunctional milling cutter in the application highly concentrates the processes of positioning, drilling and chamfering, and the operator can complete the drilling and chamfering milling work after single clamping, the drilling depth can be adjusted according to the needs through the distance adjusting mechanism 400, the processing work of different depth drilling can be completed, the time for changing tools, repositioning and tool setting is saved, and higher processing efficiency is achieved; the milling cutter bar 200 in the application is coaxially arranged in the shell 100, and the drilling and chamfering milling can be processed on the same rotation axis, which fundamentally eliminates the coaxiality error, ensures the processing quality of the workpiece, solves the problem of error in coaxiality caused by repositioning, and has higher processing precision.

[0044] In a further embodiment, the distance adjusting mechanism 400 includes an adjusting ring 410 and a spring 420; the adjusting ring 410 is sleeved on the milling cutter bar 200 and fixedly connected to the upper end of the milling cutter bar 200, and the milling cutter bar 200 is sealingly connected to the inner wall of the shell 100 through the adjusting ring 410; the upper surface of the adjusting ring 410, the upper surface of the milling cutter bar 200 and the inner wall of the upper part of the shell 100 define a liquid storage cavity 430, the liquid storage cavity 430 is communicated with a liquid supply pipe, and the liquid storage cavity 430 is filled with liquid; the spring 420 is sleeved on the milling cutter bar 200 and located in the shell 100, the upper end of the spring 420 abuts against the adjusting ring 410, and the lower end of the spring 420 abuts against the shell 100; the spring 420 makes the adjusting ring 410 have a tendency to move away from the first chamfering milling cutter edge 101.

[0045] In the initial state, the liquid filled in the liquid storage cavity 430 gives the adjusting ring 410 an action force equal to the action force given by the spring 420 to the adjusting ring 410, so that the position of the adjusting ring 410 in the shell 100 remains unchanged, at this time the drill bit 300 extends out of the shell 100 by a preset length. After the shell 100 rotates around its own axis and feeds by a preset distance, the shell 100 stops feeding and only rotates around its own axis, the cooling liquid is injected into the liquid storage cavity 430 through the liquid supply pipe, the liquid pressure in the liquid storage cavity 430 increases, when the thrust force given by the cooling liquid to the adjusting ring 410 is greater than the elastic force of the spring 420, the adjusting ring 410 and the milling cutter rod 200 are pushed to move towards the workpiece, the milling cutter rod 200 rotates synchronously with the shell 100, and the drilling work continues, at the same time the spring 420 is compressed to store energy; when the drilling depth reaches the requirement, the injection of the liquid is stopped, the milling cutter rod 200 no longer moves axially; thereafter, the chamfering milling is performed.

[0046] In further embodiments, the liquid filled in the liquid storage cavity 430 is cooling liquid, and the milling cutter rod 200 is provided with a cooling flow channel 220 penetrating upward and downward, the cooling flow channel 220 is in a spiral shape, the upper end of the cooling flow channel 220 is communicated with the liquid storage cavity 430, and the lower end of the cooling flow channel 220 is opened in the drill bit 300.

[0047] The cooling liquid filled in the liquid storage cavity 430 flows to the end of the drill bit 300 through the cooling flow channel 220, the cooling liquid is injected into the liquid storage cavity 430 through the liquid supply pipe, so that the amount of the cooling liquid in the liquid storage cavity 430 remains unchanged, the action force given by the cooling liquid to the adjusting ring 410 is equal to the action force given by the spring 420 to the adjusting ring 410, and the position of the adjusting ring 410 in the shell 100 remains unchanged, at this time the length of the drill bit 300 extending out of the shell 100 remains unchanged. During the rotation of the shell 100 around its own axis and the axial movement of the shell 100, the cooling liquid continuously flows to the end of the drill bit 300 through the cooling flow channel 220, cools and cools the milling cutter rod 200 and the drill bit 300, and reduces the friction when the drill bit 300 drills, after the shell 100 moves towards the workpiece by a preset distance, the shell 100 stops axial movement and only rotates around its own axis, at this time the flow rate of the cooling liquid to the liquid storage cavity 430 per unit time is increased, the liquid pressure in the liquid storage cavity 430 increases, and the thrust force given to the adjusting ring 410 gradually increases, when the thrust force given by the cooling liquid to the adjusting ring 410 is greater than the elastic force of the spring 420, the adjusting ring 410 and the milling cutter rod 200 are pushed to move towards the workpiece, the milling cutter rod 200 rotates synchronously with the shell 100, and the drilling work continues, at the same time the spring 420 is compressed to store energy; when the drilling depth reaches the requirement, the flow rate of the cooling liquid to the liquid storage cavity 430 per unit time is reduced, so that the amount of the cooling liquid in the liquid storage cavity 430 remains unchanged, and the milling cutter rod 200 no longer moves axially; thereafter, the chamfering milling is performed.

[0048] In a further embodiment, the adjusting ring 410 is provided with a plurality of through holes in the circumferential direction; the inside of the shell 100 is fixedly connected with a partition plate 110; the upper surface of the partition plate 110, the lower surface of the adjusting ring 410 and the peripheral wall of the shell 100 define a supplementary cavity 120; a plurality of auxiliary flow channels 130 are provided in the inside of the milling cutter bar 200; the auxiliary flow channels 130 are distributed along the extension direction of the chip flute 210; the upper end of the auxiliary flow channel 130 is in communication with the chip flute 210; and the lower end of the auxiliary flow channel 130 is in communication with the cooling flow channel 220.

[0049] In the process of drilling and chamfering milling, part of the cooling liquid in the liquid storage cavity 430 flows to the end of the drill bit 300 through the cooling flow channel 220, and part of the cooling liquid flows into the supplementary cavity 120 through the through holes on the adjusting ring 410. As the cooling liquid flows in the cooling flow channel 220, the pressure gradually decreases along the flow path, resulting in a decrease in the jet pressure when the cooling liquid is sprayed from the drill bit 300. However, the present application sets the auxiliary flow channel 130, and as the liquid level in the supplementary cavity 120 rises, the cooling liquid enters the cooling flow channel 220 through the auxiliary flow channel 130, thereby increasing the pressure of the cooling liquid when it is sprayed from the drill bit 300, and thus optimizing the cooling effect on the drill bit 300. The cooling liquid in the cooling flow channel 220 is sprayed towards the chip flute 210 through the auxiliary flow channel 130 extending out of the shell 100; an upward thrust is applied to the chips in the chip flute 210, and the chips are assisted to be discharged from the drill hole.

[0050] In a further embodiment, the shell 100 is provided with a stroke adjusting assembly 500 for limiting the maximum stroke of the axial movement of the drill bit 300 relative to the shell 100. The stroke adjusting assembly 500 comprises a sliding groove 510, a fastening groove 520 and a fastening bolt 530; the sliding groove 510 and the fastening groove 520 are both spiral-shaped, and the spiral directions and pitches of the two are consistent; the sliding groove 510 is provided in the shell 100 and extends through the inside and outside; the fastening groove 520 is provided in the outer wall of the milling cutter bar 200; the width of the sliding groove 510 is greater than the diameter of the fastening bolt 530; and the fastening bolt 530 extends through the sliding groove 510 and is screwed into the fastening groove 520 to achieve fastening.

[0051] In a further embodiment, the stroke adjusting assembly 500 further comprises a moving ring 540; the moving ring 540 is rotatably and axially movably mounted on the outside of the shell 100; a through hole extending through the inside and outside is provided in the moving ring 540; the fastening bolt 530 extends through the moving ring 540 and the sliding groove 510 from the outside to the inside, and is screwed into the fastening groove 520 to achieve fastening; a lock washer 550 is mounted between the fastening bolt 530 and the moving ring 540; and a scale 140 is provided on the outer wall of the shell 100.

[0052] In the initial state, the sliding groove 510 is opposite to the fastening groove 520, before drilling, the fastening bolt 530 is rotated to be separated from the fastening groove 520, and the position of the moving ring 540 is adjusted according to the drilling depth, so that the moving ring 540 is aligned with the corresponding scale 140 on the shell 100, in the process of moving the moving ring 540 along the axis thereof, the fastening bolt 530 slides in the sliding groove 510, and since the sliding groove 510 is spiral-shaped, the moving ring 540 rotates around the axis thereof while moving along the axis thereof. After adjustment to the target position, the fastening bolt 530 is rotated to be screwed into the fastening groove 520 and fastened, and then the fastening bolt 530 is fixedly connected to the milling cutter rod 200.

[0053] In the process of drilling, the machine tool drives the shell 100 to feed and rotate around the axis thereof, the milling cutter rod 200 moves synchronously with the shell 100, and a drilling hole of a preset depth is drilled on the workpiece. After that, the shell 100 stops feeding and only rotates around the axis thereof, the shell 100 drives the milling cutter rod 200 to rotate, the distance adjusting mechanism 400 drives the milling cutter rod 200 to move axially relative to the shell 100, and the drilling work is continued, in the process of moving the milling cutter rod 200 axially relative to the shell 100, the fastening bolt 530 slides in the sliding groove 510, when the fastening bolt 530 abuts against the end of the sliding groove 510 close to the workpiece, the axial movement of the milling cutter rod 200 is limited, the milling cutter rod 200 cannot continue to move close to the workpiece relative to the shell 100, the cutting edge 310 no longer cuts the workpiece, and the drilling work is completed.

[0054] The present application can accurately limit the maximum axial movement stroke of the milling cutter rod 200 relative to the shell 100 according to the machining requirement before drilling by arranging the stroke adjusting assembly 500, and can solve the problem of inaccurate drilling depth by mechanical limiting when the hydraulic overshoot or the spring 420 is fatigued.

[0055] In further embodiments, the diameter of the milling cutter rod 200 is smaller than that of the drill bit 300, and the second chamfer milling cutter edge 320 is arranged on the end of the drill bit 300 close to the shell 100. The first chamfer milling cutter edge 101 and the second chamfer milling cutter edge 320 are both multi-blade structures.

[0056] In the process of drilling, the diameter of the drilling hole machined on the workpiece by the drill bit 300 is equal to the diameter of the drill bit 300, in the process of drilling, the distance adjusting mechanism 400 adjusts the length of the milling cutter rod 200 protruding from the shell 100 according to the thickness of the workpiece, so that, after the drilling is completed, the lower edge of the first chamfer milling cutter edge 101 is located in the drilling hole, the upper edge of the first chamfer milling cutter edge 101 is located above the drilling hole, the upper edge of the second chamfer milling cutter edge 320 is located in the drilling hole, and the lower edge of the second chamfer milling cutter edge 320 is located below the drilling hole.

[0057] In the chamfering milling process, the milling bar 200 is moved by the machine tool along the radial direction of the hole by a preset distance, so that the first chamfering milling edge 101 and the second chamfering milling edge 320 are in contact with the hole orifices at both ends of the hole respectively; thereafter, the milling bar 200 is simultaneously rotated by the machine tool while rotating around the axis of the hole, and the first chamfering milling edge 101 and the second chamfering milling edge 320 simultaneously perform chamfering milling on the hole orifices at both ends of the hole respectively, thereby further improving the processing efficiency.

[0058] Working process:

[0059] Before the drilling process, the shell 100 is fixed on the machine tool, at this time the sliding groove 510 is opposite to the fastening groove 520, the fastening bolt 530 is rotated to make the fastening bolt 530 disengage from the fastening groove 520; and the position of the moving ring 540 is adjusted according to the depth of the hole, so that the moving ring 540 is aligned with the corresponding scale 140 on the shell 100, in the process of moving the moving ring 540 along its own axis, the fastening bolt 530 slides in the sliding groove 510, and since the sliding groove 510 is spiral-shaped, the moving ring 540 rotates around its own axis while moving along its own axis. After adjusting to the target position, the fastening bolt 530 is rotated to make the fastening bolt 530 screw into the fastening groove 520 and fasten, and thereafter the fastening bolt 530 is fixedly connected to the milling bar 200;

[0060] The shell 100 and the milling bar 200 are driven by the machine tool to reach the position where the hole needs to be punched, after completing the positioning work, the cooling liquid is injected into the liquid storage cavity 430 through the liquid supply pipe, part of the cooling liquid filled in the liquid storage cavity 430 flows to the end of the drill bit 300 through the cooling flow channel 220, so as to cool and cool the milling bar 200 and the drill bit 300, and reduce the friction when the drill bit 300 drills, and part of the cooling liquid in the liquid storage cavity 430 flows into the supplement cavity 120 through the through hole on the adjusting ring 410. The speed at which the liquid supply pipe injects the cooling liquid into the liquid storage cavity 430 makes the force of the cooling liquid in the liquid storage cavity 430 acting on the adjusting ring 410 equal to the force of the spring 420 acting on the adjusting ring 410, and the position of the adjusting ring 410 in the shell 100 remains unchanged, and the length of the drill bit 300 extending out of the shell 100 remains unchanged.

[0061] The shell 100 is fed by the machine tool while rotating around its own axis, and the shell 100 synchronously feeds and rotates around its own axis by driving the drill bit 300 through the milling bar 200; the cutting edge 310 drills the hole in the workpiece, and the chips are guided by the chip pocket 210 to be discharged to the outside of the hole. Because the end of the drill bit 300 away from the shell 100 is a complete cone, the milling bar 200 will not deviate during the drilling process.

[0062] After the shell 100 feeds a preset distance, the shell 100 stops feeding, at this time, the lower edge of the first chamfer milling cutter edge 101 is located in the drill hole, and the upper edge is located above the drill hole, and then the machine tool drives the shell 100 to rotate only around the axis of the shell 100, and the shell 100 drives the milling cutter rod 200 to rotate synchronously. The flow of cooling liquid into the liquid storage cavity 430 per unit time is increased, the hydraulic pressure in the liquid storage cavity 430 is increased, so that the force of the cooling liquid acting on the adjusting ring 410 is gradually increased, when the thrust of the cooling liquid acting on the adjusting ring 410 is greater than the elastic force of the spring 420, the adjusting ring 410 and the milling cutter rod 200 are pushed to move towards the workpiece, the milling cutter rod 200 rotates synchronously with the shell 100, and the drilling work continues. At the same time, the spring 420 is compressed to store force, and the fastening bolt 530 slides in the sliding groove 510. In the process of drilling, part of the cooling liquid filled in the liquid storage cavity 430 flows to the end of the drill bit 300 through the cooling flow channel 220, and part of the cooling liquid enters the supplement cavity 120 through the through hole. The cooling liquid in the cooling flow channel 220 flows to the end of the drill bit 300 to cool the milling cutter rod 200 and the drill bit 300, thereby reducing the frictional resistance when the drill bit 300 drills. As the cooling liquid flows in the cooling flow channel 220, the pressure along the way is gradually reduced, resulting in a decrease in the jet pressure when the cooling liquid is sprayed from the drill bit 300. However, the cooling flow channel 220 in the application is connected with the auxiliary flow channel 130, and as the liquid level of the cooling liquid in the supplement cavity 120 rises, the cooling liquid enters the cooling flow channel 220 through the auxiliary flow channel 130, thereby increasing the pressure of the cooling liquid when it is sprayed from the drill bit 300, and optimizing the cooling effect of the drill bit 300. Part of the cooling liquid in the cooling flow channel 220 is sprayed towards the chip pocket 210 through the auxiliary flow channel 130 extending out of the shell 100; an upward thrust is applied to the chips in the chip pocket 210 to assist the chips in being discharged from the drill hole.

[0063] When the fastening bolt 530 abuts against the end of the sliding groove 510 close to the workpiece, the axial movement of the milling cutter rod 200 is limited, at this time, the upper edge of the second chamfer milling cutter edge 320 is located in the drill hole, and the lower edge of the second chamfer milling cutter edge 320 is located below the drill hole. The flow of cooling liquid into the liquid storage cavity 430 per unit time is reduced, so that the amount of cooling liquid in the liquid storage cavity 430 remains unchanged, the force of the cooling liquid acting on the adjusting ring 410 is equal to the force of the spring 420 acting on the adjusting ring 410, the position of the adjusting ring 410 in the shell 100 remains unchanged, the length of the drill bit 300 extending out of the shell 100 remains unchanged, and the milling cutter rod 200 no longer moves axially relative to the shell 100; the cutting edge 310 no longer cuts the workpiece, the drilling work is completed, and the subsequent chamfering milling work is carried out.

[0064] The machine tool drives the milling cutter bar 200 to move along the radial direction of the hole by a preset distance, so that the first chamfer milling cutter edge 101 and the second chamfer milling cutter edge 320 respectively abut against the hole openings at both ends of the hole; the machine tool drives the milling cutter bar 200 to rotate around the axis of the shell 100 and to rotate around the axis of the hole, and the first chamfer milling cutter edge 101 and the second chamfer milling cutter edge 320 simultaneously perform chamfer milling on the hole openings at both ends of the hole, thereby further improving the processing efficiency.

[0065] The above merely describes the preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A multi-functional end mill with integrated fixed-point drilling and chamfering, characterized in that, include: The housing extends vertically, with the upper end being the connecting end and the lower end being provided with the first chamfering milling cutter edge; The milling cutter bar is coaxial with the housing and is inserted into the housing in a movable manner along its own axis; at least two chip grooves are evenly distributed circumferentially on the peripheral wall of the milling cutter bar, and the chip grooves are spiral in shape. The drill bit is fixedly connected to the end of the milling cutter shank away from the housing. The end of the drill bit away from the housing is provided with at least two cutting edges. The number of cutting edges is the same as the number of chip grooves, and the multiple cutting edges intersect at one point. Distance adjustment mechanism, used to adjust the length of the milling cutter shank extending out of the housing; The distance adjustment mechanism includes an adjusting ring and a spring. The adjusting ring is sleeved on the milling cutter rod and fixedly connected to the upper end of the milling cutter rod. The milling cutter rod is sealed to the inner wall of the housing through the adjusting ring. The upper surface of the adjusting ring, the upper surface of the milling cutter rod, and the upper inner wall of the housing define a liquid storage cavity. The liquid storage cavity is connected to a liquid supply pipe and is filled with liquid. The spring is sleeved on the milling cutter rod and located inside the housing. The upper end of the spring abuts against the adjusting ring, and the lower end of the spring abuts against the housing. The spring causes the adjusting ring to tend to move away from the first chamfered milling cutter edge.

2. The multi-functional end mill with integrated fixed-point drilling and chamfering as described in claim 1, characterized in that, The liquid filling the reservoir is coolant. The milling cutter bar has a vertically connected cooling channel in a spiral shape. The upper end of the cooling channel is connected to the reservoir, and the lower end of the cooling channel is located at the drill bit.

3. A multi-functional end mill with integrated fixed-point drilling and chamfering as described in claim 2, characterized in that, The adjusting ring has multiple through holes evenly distributed around its circumference; a partition is fixedly connected inside the housing, and the upper surface of the partition, the lower surface of the adjusting ring, and the peripheral wall of the housing define a supplementary cavity; multiple auxiliary flow channels are provided inside the end of the milling cutter bar away from the drill bit; the multiple auxiliary flow channels are distributed at intervals along the extension direction of the chip groove; the end of the auxiliary flow channel away from the drill bit is connected to the chip groove, and the end of the auxiliary flow channel near the drill bit is connected to the cooling flow channel.

4. A multi-functional end mill with integrated fixed-point drilling and chamfering as described in claim 3, characterized in that, The end of the milling cutter bar near the drill bit has multiple auxiliary flow channels inside; the multiple auxiliary flow channels are distributed at intervals along the extension direction of the chip groove; the upper end of the auxiliary flow channel is connected to the chip groove, and the lower end of the auxiliary flow channel is connected to the cooling flow channel.

5. A multi-functional end mill with integrated fixed-point drilling and chamfering as described in claim 1, characterized in that, The housing is equipped with a stroke adjustment component to limit the maximum stroke of the drill bit relative to the housing in the axial direction.

6. A multi-functional end mill with integrated fixed-point drilling and chamfering according to claim 5, characterized in that, The stroke adjustment assembly includes a slide groove, a fastening groove, and a fastening bolt; both the slide groove and the fastening groove are spiral-shaped, and their spiral directions and pitches are consistent; the slide groove is formed in the housing and extends through both the inside and outside; the fastening groove is formed on the outer wall of the milling cutter shank; the width of the slide groove is greater than the diameter of the fastening bolt; the fastening bolt passes through the slide groove and is screwed into the fastening groove.

7. A multi-functional end mill with integrated fixed-point drilling and chamfering as described in claim 6, characterized in that, The stroke adjustment assembly also includes a moving ring; the moving ring is rotatably and axially movable on the outside of the housing; the moving ring has a through hole that runs through both the inside and outside, and the fastening bolt passes through the moving ring and the sliding groove from the outside to the inside in sequence, and the fastening bolt is screwed into the fastening groove to achieve fastening; an anti-loosening washer is installed between the fastening bolt and the moving ring; the outer wall of the housing is provided with a scale.

8. A multi-functional end mill with integrated fixed-point drilling and chamfering according to claim 1, characterized in that, The diameter of the milling cutter shank is smaller than the diameter of the drill bit, and a second chamfered milling cutter edge is provided at the end of the drill bit near the housing.

9. A multi-functional end mill with integrated fixed-point drilling and chamfering according to claim 8, characterized in that, Both the first and second chamfering milling cutter edges are multi-blade structures.

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