Double-sided chamfering tool

Abstract

The present invention discloses a double-sided chamfering tool, which relates to the technical field of mechanical milling tools. It includes a tool rod, a tool hole is opened on the side wall of the tool rod, an elastic part is fixed inside the tool hole, a chamfering tool is fixed on the elastic part, the chamfering tool has at least two blades, and at least two blades are in opposite directions; the movement direction of the elastic part is perpendicular to the rotation axis of the tool rod. At least one blade of the chamfering tool is in the opposite direction to the blade of the tool commonly used in CNC milling, and the blade can chamfer the back of the workpiece. And when the tool rod is not rotating, the chamfering tool retracts into the tool hole, so that the chamfering tool will not damage other parts of the workpiece during the movement of the tool rod, until the tool rod moves to the position to be chamfered on the back of the workpiece, the tool rod rotates, generates centrifugal force, and causes the elastic part to drive the chamfering tool to extend out of the tool hole and protrude from the tool rod, and chamfer the corresponding position on the back of the workpiece.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical milling tools, in particular to a double-sided chamfering tool. Background Art

[0002] Chamfering is a common milling process. There are two main methods for chamfering: manual chamfering, where a fitter uses a drill. This method produces poor results and is inefficient, making it suitable for less demanding applications. The second method, using a chamfering cutter combined with programming, offers relatively high precision and efficiency.

[0003] However, both methods require secondary chamfering, that is, after the operator completes one side, the workpiece needs to be turned over and chamfered again, which is not conducive to the consistency of chamfering. In situations with higher requirements, in order to avoid the position of the workpiece being offset from the last clamping position, reprogramming is required, which will undoubtedly result in low chamfering efficiency. Summary of the Invention

[0004] The purpose of the present invention is to provide a double-sided chamfering tool with at least two oppositely directed blades to address the above-mentioned problems, which can chamfer the other side of a workpiece without manual chamfering or flipping the workpiece.

[0005] The technical solution adopted in the present invention is as follows:

[0006] A double-sided chamfering tool is installed on a CNC milling cutter handle, characterized in that it includes a tool rod, a tool hole is opened on the side wall of the tool rod, an elastic part is fixed inside the tool hole, a chamfering tool is fixed on the elastic part, the chamfering tool has at least two blades, and at least two blades are in opposite directions; the movement direction of the elastic part is perpendicular to the rotation axis of the tool rod, and when the tool rod is rotating, the elastic part moves toward the tool hole under the centrifugal force, driving the chamfering tool to pass through the tool hole and protrude from the side wall of the tool rod; when the tool rod is not rotating, the elastic part retracts, driving the chamfering tool to retract into the tool hole.

[0007] By adopting the above technical solution, the direction of at least one blade of the chamfering tool is opposite to the direction of the blade of the tool commonly used on the CNC milling machine, so that the chamfering tool can be moved to the back of the workpiece to chamfer the back of the workpiece; in order to prevent the chamfering tool from damaging other parts of the workpiece during the movement of the tool rod, an elastic part is added so that when the tool rod is not rotating, the chamfering tool retracts into the tool hole and is difficult to contact other parts of the workpiece outside the tool rod. When the tool rod moves to the chamfering position on the back of the workpiece, it rotates again to generate centrifugal force, causing the elastic part to stretch, which will drive the chamfering tool to protrude from the tool rod to chamfer the designated position of the workpiece.

[0008] Preferably, a centrifugal block is connected between the chamfering knife and the elastic member, the opening size of the knife hole is adapted to the size of the centrifugal block, and the centrifugal block can pass through the knife hole.

[0009] With this technical solution, because the chamfering cutter has its own mass, when the elastic member extends, the cutter protrudes from the cutter hole and is easily pulled downward by gravity, causing the cutter's trajectory to deviate and preventing accurate chamfering. When the elastic member returns to its original length, the cutter retracts into the cutter hole and is easily pulled downward by gravity, causing the cutter's trajectory to deviate and prevent accurate retraction. However, with one end of the centrifugal block extending or retracting into the cutter hole while the other end remains within it, the centrifugal block consistently moves along the edge of the cutter hole. This design limits the chamfering cutter's trajectory and prevents the chamfering cutter from deviating due to its own gravity.

[0010] Preferably, a slot is provided at the end of the centrifugal block, the slot is adapted to fit the chamfering knife, and the chamfering knife is inserted into the slot and detachably connected to the centrifugal block.

[0011] Using the above technical solution, the slot is designed to enable the chamfering knife to be detached from the centrifugal block. The chamfering knife can be replaced according to the actual chamfering angle required. When the chamfering knife is worn or damaged, the chamfering knife can be detached from the centrifugal block and repaired or replaced.

[0012] Preferably, the double-sided chamfering tool also includes an adjusting rod and an adjusting ring mounted on the adjusting rod. A limiting groove is provided on the centrifugal block, and a limiting block is extended on the adjusting ring. The limiting block is located in the limiting groove. When the centrifugal block is moved by centrifugal force to the end of the limiting groove and contacts the limiting block, the centrifugal block can no longer continue to move in the same direction.

[0013] The rotation speed of the tool bar determines the size of the centrifugal force, which determines the length of the chamfering cutter extending out of the tool hole. However, if the rotation speed is too low, the chamfering cutter's chamfering force will be small, and the workpiece cannot be effectively cut. The design of the above scheme allows the tool bar's rotation speed to be controlled so that the chamfering cutter can effectively cut the workpiece. The position of the adjusting ring is changed by the adjusting rod, and then the position of the limit block in the limit slot is changed. When the chamfering cutter extends out of the tool hole, the centrifugal block moves in the same direction. When the end of the limit slot contacts the limit block, the centrifugal block cannot continue to move in the same direction, so that the chamfering cutter cannot continue to move in the same direction. This is the maximum length of the chamfering cutter extending out of the tool hole. According to the actual chamfering requirements, the position of the limit block relative to the limit slot is adjusted according to the principle of this method, so that the length of the chamfering cutter extending out of the tool hole is not completely affected by the tool bar rotation speed.

[0014] Preferably, an adjustment hole is further provided on the side wall of the knife rod, the adjustment rod is located in the adjustment hole, one end of the adjustment rod is an adjustment portion, and the adjustment portion is exposed from the adjustment hole.

[0015] By adopting the above technical solution, the adjustment portion exposes the adjustment hole, which is convenient for the operator to adjust the adjustment rod, and then adjust the position of the limit block relative to the limit slot.

[0016] Preferably, an external thread is provided on the adjusting rod, an internal thread is provided on the inner wall of the adjusting ring, the adjusting rod is threadedly connected to the adjusting ring, the adjusting rod is rotatably connected to the knife rod, and the adjusting rod rotates to drive the adjusting ring to move along the adjusting rod, thereby changing the position of the limit block relative to the limit groove.

[0017] With the above technical solution, the adjusting rod and the adjusting ring are connected by threads, so by rotating the adjusting rod, the adjusting ring can be moved along the adjusting rod, thereby moving the limit block along the limit groove.

[0018] Preferably, the adjusting portion of the adjusting rod is provided with a rotating hole, and the adjusting rod is rotated by rotating the rotating hole.

[0019] By adopting the above technical solution, the adjustment part exposes the adjustment hole, and the rotating hole also exposes the adjustment hole. The operator inserts a tool into the rotating hole and rotates it to rotate the adjustment rod, thereby adjusting the position of the adjustment ring.

[0020] Preferably, a mounting piece is connected between the elastic piece and the centrifugal block, one end of the mounting piece is detachably connected to the elastic piece, and the mounting piece is connected to the knife rod.

[0021] By adopting the above technical solution, the mounting piece is used to fix the elastic piece on the knife rod, and the mounting piece can be detached from the elastic piece to repair or replace the mounting piece or the elastic piece.

[0022] Preferably, a mounting hole is further provided on the side wall of the shank, the mounting piece is located inside the mounting hole, the end of the mounting piece is the mounting portion, and the mounting portion is exposed from the mounting hole.

[0023] By adopting the above technical solution, the mounting member is connected to the elastic member through the mounting portion, which facilitates the connection and separation of the two.

[0024] Preferably, the centrifugal block is detachably connected to the elastic member.

[0025] With the above technical solution, after long-term use, the elastic force of the elastic member will decrease, and the elastic member needs to be replaced regularly. The elastic member can be detached and replaced through the above-mentioned detachable connection method.

[0026] In summary, due to the adoption of the above technical solution, the beneficial effect of the present invention is that at least one blade direction of the chamfering cutter is opposite to the blade direction of the tool commonly used in CNC milling, and the blade can chamfer the back of the workpiece. And when the tool rod is not rotating, the chamfering cutter retracts into the tool hole, so that the chamfering cutter will not damage other parts of the workpiece during the movement of the tool rod, until the tool rod moves to the position to be chamfered on the back of the workpiece, the tool rod rotates, generating centrifugal force, so that the elastic part drives the chamfering cutter to extend out of the tool hole and protrude from the tool rod, and chamfers the corresponding position on the back of the workpiece. The design of this tool makes it unnecessary to use manual chamfering when the back of the workpiece needs to be chamfered, nor does it require the operator to flip the workpiece over and re-clamp, program, and chamfer it. It is only necessary to move this tool to achieve the chamfering work on the back of the tool, ensuring the chamfering effect while relatively increasing the chamfering efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present invention.

[0028] Figure 2 for Figure 1 Schematic diagram of the structure from another angle.

[0029] Figure 3 It is a top view of the present invention.

[0030] Figure 4 Schematic diagram of the tool bar structure.

[0031] Figure 5 It is a schematic diagram of the structure of the present invention excluding the knife bar.

[0032] Figure 6 for Figure 5 Schematic diagram of the structure from another angle.

[0033] Figure 7 Schematic diagram of the structure of the centrifugal block.

[0034] Figure 8 for Figure 7 Schematic diagram of the structure from another angle.

[0035] Figure 9 A schematic diagram of the structure of the installation parts.

[0036] Figure 10 for Figure 9 Schematic diagram of the structure from another angle.

[0037] Figure 11 It is a structural diagram of the adjustment rod and the adjustment ring.

[0038] Markings in the figure: tool rod-1, tool hole-11, adjustment hole-12, mounting hole-13, chamfering tool-2, centrifugal block-3, slot-31, connecting column-32, limiting slot-33, elastic member-4, mounting member-5, mounting column-51, mounting portion-52, adjusting rod-6, adjusting portion-61, rotating hole-62, adjusting ring-7, limiting block-71. DETAILED DESCRIPTION

[0039] The present invention will be described in detail below with reference to the accompanying drawings.

[0040] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0041] Please see Figures 1 to 11 A double-sided chamfering tool is installed on a CNC milling cutter handle and is described below using a CNC milling machine with the tool arbor facing vertically downward as an example.

[0042] The double-sided chamfering tool comprises a shank 1, a chamfering blade 2, a centrifugal block 3, an elastic member 4, a mounting member 5, an adjustment rod 6, and an adjustment ring 7. The shank 1 is vertically arranged and cylindrical, open at the top, hollow inside, and closed at the bottom. The sidewalls of the shank 1 are defined by a blade hole 11, an adjustment hole 12, and a mounting hole 13. The blade hole 11 and mounting hole 13 are aligned, and the shape and size of the blade hole 11 are adapted to those of the centrifugal block 3. The chamfering blade 2, centrifugal block 3, elastic member 4, and mounting member 5 are connected horizontally in sequence.

[0043] The chamfering knife 2 has two blades facing in opposite directions, one facing upward and tilted downward, and the other facing downward and tilted upward. The end of the chamfering knife 2 with a blade faces the knife hole 11, and the end without a blade is connected to the centrifugal block 3. The chamfering knife 2 can be moved to the back of the workpiece, and its upward blade can chamfer the back of the workpiece.

[0044] The centrifugal block 3 is provided with a slot 31 adapted to the chamfering knife 2 at one end facing the knife hole 11. The chamfering knife 2 is inserted into the slot 31 and connected with the centrifugal block 3, and the chamfering knife 2 can be detached from the slot 31. The slot 31 is designed to enable the chamfering knife 2 to be detached from the centrifugal block 3. The chamfering knife 2 can be replaced according to the actual chamfering angle required. In addition, when the chamfering knife 2 is worn or damaged, the chamfering knife 2 can be detached from the centrifugal block 3 to repair or replace the chamfering knife 2. One end of the centrifugal block 3 facing the mounting hole 13 is provided with a slot 31 adapted to the chamfering knife 2. The chamfering knife 2 is inserted into the slot 31 and connected with the centrifugal block 3. The chamfering knife 2 can be detached from the slot 31. A connecting post 32 protrudes laterally from the end, and an internal thread is provided on the connecting post 32. The connecting post 32 is connected to the elastic member 4. Since the chamfering knife 2 has its own mass, when the elastic member 4 is extended, the chamfering knife 2 protrudes from the knife hole 11 and is easily moved downward by gravity, causing the trajectory of the chamfering knife 2 to deviate, making it impossible to complete the chamfering work accurately. When the elastic member 4 returns to its original length, the chamfering knife 2 retracts into the knife hole 11 and is easily moved downward by gravity, causing the trajectory of the chamfering knife 2 to deviate, making it impossible to accurately retract into the knife hole 11. One end of the centrifugal block 3 extends out of or retracts into the knife hole 11, while the other end is always located inside the knife hole 11. The centrifugal block 3 always moves along the edge of the knife hole 11. The design of the centrifugal block 3 can limit the movement trajectory of the chamfering knife 2, preventing the chamfering knife 2 from deviating due to its own gravity. A U-shaped limiting groove 33 is provided on the upper part of the centrifugal block 3.

[0045] The elastic member 4 is a helical spring. In order to prevent the chamfering cutter 2 from damaging other parts of the workpiece during the movement of the tool bar 1, the elastic member 4 is added so that when the tool bar 1 is not rotating, the elastic member 4 is at its original length, driving the chamfering cutter 2 to retract into the cutter hole 11, making it difficult to contact other parts of the workpiece outside the tool bar 1. When the tool bar 1 moves to the chamfering position on the back of the workpiece, it rotates again, generating centrifugal force, causing the elastic member 4 to extend, which will drive the chamfering cutter 2 to protrude from the tool bar 1 and chamfer the designated position of the workpiece. The internal thread on the connecting column 32 is adapted to the elastic member 4, and the elastic member 4 can be spirally mounted on the connecting column 32, that is, the elastic member 4 can be threadedly connected to the connecting column 32. After long-term use, the elastic force of the elastic member 4 will decrease, and the elastic member 4 needs to be replaced regularly. Through the above-mentioned detachable connection method, the elastic member 4 can be detached and replaced.

[0046] The end of the mounting member 5 facing away from the mounting hole 13 includes a mounting post 51. This post 51 also has internal threads that mate with the elastic member 4. The elastic member 4 can also be screwed onto the post 51, meaning that the elastic member 4 can also be threadedly connected to the post 51. The mounting member 5 can be detached from the elastic member 4 to allow for repair or replacement of either. The end of the mounting member 5 facing the mounting hole 13 includes a mounting portion 52. This portion 52 protrudes from the mounting hole 13 but does not protrude from the arbor 1. This portion 52 connects the mounting member 5 to the elastic member 4, making both connection and disconnection easy.

[0047] The adjusting rod 6 is arranged horizontally. The end of the adjusting rod 6 facing the adjusting hole 12 is an adjusting portion 61. The adjusting portion 61 is exposed from the adjusting hole 12 but does not protrude from the cutter bar 1. The adjusting rod 6 is provided with an external thread. The adjusting portion 61 is rotatably connected to the cutter bar 1 at the adjusting hole 12, that is, the adjusting rod 6 can rotate relative to the cutter bar 1. The rotation axis of the adjusting rod 6 is perpendicular to the rotation axis of the cutter bar 1. The end of the adjusting portion 61 is provided with a rotating hole 62. Rotating the rotating hole 62 can rotate the adjusting rod 6 relative to the cutter bar 1. The inner wall of the adjusting ring 7 is provided with an internal thread. The internal thread of the adjusting ring 7 is adapted to the external thread of the adjusting rod 6. The adjusting ring 7 is sleeved on the adjusting rod 6 and the two are threadedly connected. When the adjusting rod 6 rotates, the adjusting ring 7 moves relative to the adjusting rod 6. A limit block 71 extends vertically downward from the outer wall of the adjusting rod 6. The bottom end of the limit block 71 is located in the limit slot 33. When the adjusting rod 6 rotates, the adjusting ring 7 moves along the adjusting rod 6, changing the position of the limit block 71 relative to the limit slot 33. The rotation speed of the tool bar 1 determines the magnitude of the centrifugal force, which in turn determines the length of the chamfering cutter 2 extending out of the cutter hole 11. However, if the rotation speed is too low, the chamfering cutter 2 will have a small chamfering force and will not be able to effectively cut the workpiece. The design of the above scheme allows the rotation speed of the tool bar 1 to be controlled so that the chamfering cutter 2 can effectively cut the workpiece. By rotating the adjustment rod 6 to change the position of the adjustment ring 7, the position of the limit block 71 in the limit groove 33 is changed. When the chamfering cutter 2 extends out of the cutter hole 11, the centrifugal block 3 moves in the same direction. When the end of the limit groove 33 contacts the limit block 71, the centrifugal block 3 cannot continue to move in the same direction, so that the chamfering cutter 2 cannot continue to move in the same direction. This is the maximum length of the chamfering cutter 2 extending out of the cutter hole 11. According to the actual chamfering requirements, the position of the limit block 71 relative to the limit groove 33 is adjusted through the principle of this method to achieve that the length of the chamfering cutter 2 extending out of the cutter hole 11 is not completely affected by the rotation speed of the tool bar 1. The adjusting portion 61 exposes the adjusting hole 12 , and the rotating hole 62 also exposes the adjusting hole 12 . An operator inserts a tool into the rotating hole 62 and rotates it, thereby rotating the adjusting rod 6 and adjusting the position of the adjusting ring 7 .

[0048] This tool is suitable for chamfering the edges of the front and back sides of workpieces, as well as the front and back sides of through holes in workpieces.

[0049] The tool adjustment method is:

[0050] When the chamfer size needs to be adjusted, the operator uses a tool to insert the rotary hole 62, rotates the adjusting rod 6, moves the adjusting ring 7 along the adjusting rod 6, changes the position of the limit block 71 in the limit groove 33, and then adjusts the maximum length of the chamfering knife 2 extending out of the knife hole 11.

[0051] The working principle of this tool is:

[0052] When this tool is chamfering the front of a workpiece, the tool bar 1 drives the chamfering cutter 2 to the chamfering position on the front of the workpiece. The tool bar 1 rotates, driving the chamfering cutter 2 to chamfer with its downward-pointing blade. After chamfering is completed, the tool bar 1 stops rotating and moves to the starting position, completing the chamfering process.

[0053] When this tool is chamfering the back of a workpiece, the tool bar 1 drives the chamfering cutter 2 to move to the chamfering position on the back of the workpiece. During the movement, the tool bar 1 does not rotate, the elastic member 4 is at its original length, and the chamfering cutter 2 is retracted into the cutter hole 11 to prevent the chamfering cutter 2 from damaging other parts of the workpiece during the movement of the tool bar 1. The tool bar 1 moves to the position on the back of the workpiece to be chamfered and stops. The tool bar 1 rotates, and the elastic member 4 stretches under the action of centrifugal force, successively throwing the end of the centrifugal block 3 and the chamfering cutter 2 out of the cutter hole 11. The chamfering cutter 2 protrudes from the tool bar 1 and contacts the part of the workpiece to be chamfered, chamfering the part. After the chamfering is completed, the tool bar 1 stops rotating, the elastic member 4 returns to its original length, and drives the centrifugal block 3 to completely retract into the cutter hole 11, and drives the chamfering cutter 2 to fully or partially retract into the cutter hole 11. The tool bar 1 moves to the starting position, and the chamfering is completed.

[0054] The principles and implementation methods of the present invention are described herein using specific embodiments. The description of the above embodiments is intended only to facilitate understanding of the method and core concept of the present invention. It should be noted that those skilled in the art may make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A double-sided chamfering tool, mounted on a CNC milling cutter handle, characterized in that: The utility model comprises a tool rod, a tool hole is formed in the side wall of the tool rod, an elastic member is fixed inside the tool hole, a chamfering knife is fixed on the elastic member, and the chamfering knife has two blades, and the two blades are in opposite directions; the movement direction of the elastic member is perpendicular to the rotation axis of the tool rod, and when the tool rod is in a rotating state, the centrifugal block moves toward the tool hole under the centrifugal force, driving the chamfering knife to pass through the tool hole and protrude from the side wall of the tool rod; when the tool rod is not rotating, the elastic member retracts, driving the chamfering knife to retract into the tool hole; When chamfering the front of the workpiece, the tool bar drives the chamfering tool to move to the chamfering position of the front of the workpiece, and the tool bar rotates to drive the downward blade of the chamfering tool to chamfer; After chamfering is completed, the tool bar stops rotating and moves to the starting position, and the chamfering is completed; When chamfering the back of a workpiece, the tool rod drives the chamfering knife to move to the chamfering position on the back of the workpiece. During the movement, the tool rod does not rotate, the elastic member is at its original length, and the chamfering knife is in a state of retracting the knife hole. The tool rod moves to the position to be chamfered on the back of the workpiece and stops. The tool rod rotates, and the elastic member stretches under the action of centrifugal force, throwing the end of the centrifugal block and the chamfering knife out of the knife hole in turn. The chamfering knife protrudes from the tool rod and contacts the part to be chamfered on the workpiece to chamfer that part. After chamfering is completed, the knife rod stops rotating, the elastic member returns to its original length, and drives the centrifugal block to completely retract into the knife hole, drives the chamfering knife to fully or partially retract into the knife hole, and the knife rod moves to the starting position, and the chamfering is completed; a centrifugal block is connected between the chamfering knife and the elastic member, and the opening size of the knife hole is adapted to the size of the centrifugal block, so that the centrifugal block can pass through the knife hole; The centrifugal block further comprises an adjusting rod and an adjusting ring sleeved on the adjusting rod, a limiting groove is provided on the centrifugal block, a limiting block extends from the adjusting ring, the limiting block is located in the limiting groove, and when the centrifugal block is moved by centrifugal force until the end of the limiting groove contacts the limiting block, the centrifugal block can no longer continue to move in the same direction; The adjusting rod is provided with an external thread, the inner wall of the adjusting ring is provided with an internal thread, the adjusting rod is threadedly connected to the adjusting ring, the adjusting rod is rotatably connected to the knife rod, and the adjusting rod rotates to drive the adjusting ring to move along the adjusting rod, thereby changing the position of the limit block relative to the limit groove; A clamping slot is provided at the end of the centrifugal block. The clamping slot is adapted to fit a chamfering knife. The chamfering knife is clamped into the clamping slot and is detachably connected to the centrifugal block.

2. The double-sided chamfering tool according to claim 1, characterized in that: The side wall of the knife rod is further provided with an adjustment hole, the adjustment rod is located in the adjustment hole, one end of the adjustment rod is an adjustment portion, and the adjustment portion is exposed from the adjustment hole.

3. The double-sided chamfering tool according to claim 1, characterized in that: The adjusting portion of the adjusting rod is provided with a rotation hole, and the adjusting rod is rotated by rotating the rotation hole.

4. The double-sided chamfering tool according to claim 1, characterized in that: It also includes a mounting piece, one end of which is detachably connected to the elastic piece, and the mounting piece is connected to the knife rod.

5. The double-sided chamfering tool according to claim 1, characterized in that: The side wall of the knife rod is also provided with a mounting hole, the mounting piece is located inside the mounting hole, the end of the mounting piece is the mounting portion, and the mounting portion is exposed from the mounting hole.

6. The double-sided chamfering tool according to claim 3, characterized in that: The centrifugal block is detachably connected to the elastic member.

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