A tool that facilitates chip-free cutting

Abstract

A cutting tool that facilitates chip-free cutting includes a clamping portion and a cutting head disposed at one end of the clamping portion. The cutting head includes a cutting edge, a first cleaving portion located on one side of the cutting edge, and a second cleaving portion located on the other side of the cutting edge. During cutting, the workpiece rotates, and the outline of the first cleaving portion is parabolic in a cross-section along the plane of rotation of the workpiece. In a cross-section perpendicular to the plane of rotation of the workpiece and parallel to the alignment direction of the cutting head and the clamping portion, the outline of the first cleaving portion is straight. In a cross-section perpendicular to the plane of rotation of the workpiece and perpendicular to the alignment direction of the cutting head and the clamping portion, the first cleaving portion is an arc. The second cleaving portion has a rounded chamfer with a radius less than or equal to 0.2 mm. This cutting tool achieves chip-free cutting through the structural design of the cutting head.

Description

Technical Field

[0001] This invention belongs to the field of automotive parts technology, and in particular, it is a cutting tool that facilitates chipless cutting. Background Technology

[0002] Piston rings made of polymer materials such as plastics, PTFE, and rubber are widely used in the cylinder pistons of various types of air compressors. These piston rings rely on their own tension to keep the piston pressed against the inner surface of the cylinder, preventing air from being drawn in or expelled from the cylinder. Therefore, the piston rings avoid direct friction between the piston and the cylinder wall, which would reduce the roundness or cylindricity of the cylinder and piston.

[0003] Currently, PTFE piston rings are generally produced through turning. Traditional turning cutting involves material waste due to the thickness of the cutting tool, and the resulting chips tend to entangle on the tool, leading to uneven cut surfaces. Furthermore, to ensure product quality, the flatness of one side is often sacrificed, requiring the piston ring's front and back to be identified during assembly and further post-processing. This undoubtedly reduces production efficiency and increases product costs. Summary of the Invention

[0004] In view of this, the present invention provides a cutting tool that can solve the above-mentioned problems and facilitate chip-free cutting.

[0005] A cutting tool that facilitates chip-free cutting includes a clamping portion and a cutting head disposed at one end of the clamping portion. The cutting head includes a cutting edge, a first cleaving portion located on one side of the cutting edge, and a second cleaving portion located on the other side of the cutting edge. During cutting, the workpiece rotates, and the outline of the first cleaving portion is parabolic in a cross-section along the plane of rotation of the workpiece. In a cross-section perpendicular to the plane of rotation of the workpiece and parallel to the alignment direction of the cutting head and the clamping portion, the outline of the first cleaving portion is straight. In a cross-section perpendicular to the plane of rotation of the workpiece and perpendicular to the alignment direction of the cutting head and the clamping portion, the outline of the first cleaving portion is arcuate. The second cleaving portion has a rounded chamfer with a radius less than or equal to 0.2 mm.

[0006] Furthermore, the cutting tool is made of tungsten steel.

[0007] Furthermore, the cutting tool is used to cut polymer materials.

[0008] Furthermore, on a cross section perpendicular to the plane of rotation of the workpiece being cut and parallel to the arrangement direction of the blade head and the clamping portion, the angle between the outline of the first cleaving portion and the plane of rotation of the workpiece being cut is between 8 degrees and 16 degrees.

[0009] Furthermore, the first split portion is manufactured by grinding with a grinding wheel, and the clamping portion is held by the output end of a motor.

[0010] Furthermore, during grinding, the central axis of the rotating shaft of the grinding wheel has an acute angle with the arrangement direction of the cutter head and the clamping part.

[0011] Furthermore, the acute angle is between 8 degrees and 16 degrees.

[0012] Furthermore, when the tool is used, the object to be cut is clamped on a rotating clamp, and the arrangement direction of the tool head and the clamping part is perpendicular to the rotation axis of the object to be cut.

[0013] Furthermore, the material to be cut includes product material and cutting waste, with the second cleaved portion facing the product material.

[0014] Furthermore, the clamping part is flat.

[0015] Compared with existing technologies, the cutting tool provided by this invention achieves chip-free cutting through the structural design of the cutting head. Specifically, due to the presence of the second cleaving portion and the arc-shaped contour of the first cleaving portion, the cutting edge has a guiding function when cutting into the workpiece, gradually widening the two cut surfaces. The first cleaving portion has a parabolic contour, which conforms to the trajectory of the cutting edge inserting into the workpiece, thus making it more conducive to cleaving the two cut surfaces. When widening the two cut surfaces, the first cleaving portion, with its straight contour, will continuously widen the two cut surfaces instead of continuously cutting the workpiece by the cutting edge, thereby further avoiding the generation of chips. Since no chips are generated, the flatness of the two cut surfaces can be guaranteed, so there is no need to distinguish between the front and back during assembly, thereby improving production and assembly efficiency and saving materials. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of a cutting tool that facilitates chipless cutting, as provided by the present invention.

[0017] Figure 2 for Figure 1 A schematic diagram of the side structure of a cutting tool that facilitates chipless cutting.

[0018] Figure 3 for Figure 2A magnified schematic diagram of the tool at point A, which is conducive to chipless cutting.

[0019] Figure 4 for Figure 2 A schematic diagram of the cross-sectional structure of a cutting tool along the BB line that facilitates chipless cutting.

[0020] Figure 5 for Figure 1 A schematic diagram of the front structure of a cutting tool that facilitates chipless cutting. Detailed Implementation

[0021] The following provides a more detailed description of specific embodiments of the present invention. It should be understood that the description of the embodiments of the present invention herein is not intended to limit the scope of protection of the present invention.

[0022] like Figures 1 to 5 The diagram shows a structural schematic of a chip-free cutting tool provided by the present invention. The chip-free cutting tool includes a clamping portion 10 and a cutting head 20 disposed at one end of the clamping portion 10. It is conceivable that the chip-free cutting tool may also include other functional structures, such as clamping structures for clamping the clamping portion 10 onto a tooling, grooves to enhance the clamping and fixing effect, etc., which are well-known to those skilled in the art and will not be described in detail here.

[0023] The cutting tool, which facilitates chip-free cutting, can be made of hard metal materials such as high-speed steel, high-manganese steel, and tungsten steel, thus achieving sharpness, high hardness, and wear resistance. This tool is used for cutting polymer materials.

[0024] The clamping part 10 is integrally formed with the cutting head 50, meaning the cutting head 50 is directly formed on the clamping part 10. It is conceivable that when saving tungsten steel is required, the clamping part 10 can be made of ordinary steel, such as carbon steel. Then, the cutting head 50 is welded to the clamping part 10. The clamping part 10 can be flat, and the cutting head 20 is directly formed by grinding the end of the clamping part 10 using a grinding wheel. In this embodiment, the clamping part 10 has a width of 10mm, a length of 100mm, and a thickness of 2mm.

[0025] The blade head 20 includes a cutting edge 21, a first cleaving portion 22 located on one side of the cutting edge 21, and a second cleaving portion 23 located on the other side of the cutting edge 21. The cutting edge 21 is formed by machining the first and second cleaving portions 22 and 23; therefore, the structure and manufacturing method of the first and second cleaving portions 22 and 23 will be described first. Since the blade head 20 is used to cut the workpiece, its structure is referenced to the workpiece. It is understood that when cutting a workpiece such as a piston ring, the blade is fixed, while the workpiece is rotated about a central axis. The contour of the first cleaving portion 22 on the cross-section along the plane of rotation of the workpiece is a parabola, such as... Figure 5 As shown. On a cross-section perpendicular to the plane of rotation of the workpiece being cut and parallel to the arrangement direction of the blade head 20 and the clamping portion 10, the outline of the first cleaving portion 22 is a straight line, as shown. Figure 2 As shown. On a cross-section perpendicular to the plane of rotation of the workpiece being cut and parallel to the arrangement direction of the blade head 20 and the clamping portion 10, the outline of the first cleaving portion 22, i.e., the straight line, forms an angle between the outline and the plane of rotation of the workpiece being cut, which is between 8 and 16 degrees. The angle can be specifically set according to the thickness of the part and the flatness requirements. In this embodiment, the angle is 10 degrees. On a cross-section perpendicular to the plane of rotation of the workpiece being cut and perpendicular to the arrangement direction of the blade head 20 and the clamping portion 10, the arc of the first cleaving portion 22 is shown... Figure 4 As shown. The first cleaving portion 22 is manufactured by grinding with a grinding wheel. Specifically, the clamping portion 10 is held by the output end of a motor. During grinding, the central axis of the grinding wheel's rotation shaft forms an acute angle between the arrangement direction of the cutting head 20 and the clamping portion 10, and this acute angle is between 8 and 16 degrees. Simultaneously, during grinding, the clamping portion 10 reciprocates along the arrangement direction of the cutting head 20 and the clamping portion 10 under the control of the motor, thereby forming the first cleaving portion 22. The arrangement direction of the cutting head 10 and the clamping portion 10 is parallel to the central axis of the grinding wheel's rotation shaft. The first cleaving portion 22 is ground until a very thin cutting edge is formed.

[0026] The second split portion 23 is machined after the first split portion 22 is ground. It is formed by cutting with a rounding cutter; therefore, the second split portion 23 has a rounded chamfer, the radius of which is less than or equal to 0.2 mm. Figure 3As shown. Since the second cleaving portion 23 is only a rounded chamfer, the blade head 10 on one side of the second cleaving portion 23 remains basically flat, which helps to ensure the flatness of the cut surface. At the same time, due to the presence of the second cleaving portion 23, it has a guiding effect when the blade 21 cuts, especially since it is a rounded chamfer, its guiding effect is even better.

[0027] When the first cleaving portion 22 and the second cleaving portion 23 are processed, the cutting edge 21 is also formed, so no further explanation is needed. Since the outline of the first cleaving portion 22 is a parabola on the cross-section along the plane rotating around the workpiece, the cutting edge 21 is also a parabola, as shown below. Figure 5 As shown.

[0028] When the cutting tool is used, the object to be cut is clamped on a rotating jig, such as the output shaft of a motor. This rotating jig can also be an internal support type. The motor drives the rotating jig to rotate, thereby rotating the object to be cut. The arrangement direction of the cutting head 20 and the clamping part 10 is perpendicular to the rotation axis of the object to be cut. It is understood that the object to be cut includes product material and cutting waste, and the second splitting part 23 faces the product material. At the same time, since the cutting tool provided in this application can achieve a chip-free effect, it can directly cut a raw material tube, thereby cutting it into multiple product materials, such as multiple piston rings. During cutting, the cutting edge 21 not only cuts the object to be cut, but also, due to the presence of the second splitting part 23, it has a guiding function, thereby avoiding the generation of chips. If the second splitting part 23 is not present, if the cutting edge 21 is always in a cutting state, chips will inevitably be generated. Because of mechanical errors and the fact that the blade 21 cannot remain in a straight line, it will inevitably produce some runout. This runout will prevent it from cutting in a straight line, resulting in chipping. Since the first splitting portion 22 has a parabolic profile, which matches the trajectory of the blade 21 inserting into the material being cut, it is more conducive to splitting the two cut surfaces. Simultaneously, because the first splitting portion 23 has an arc-shaped profile, it also has a guiding function, gradually widening the two cut surfaces. When the two cut surfaces are widened, because the first splitting portion 22 has a straight profile, it will continuously widen the two cut surfaces, rather than the blade 21 continuously cutting the material, thus avoiding chipping. Since no chipping is generated, the flatness of the two cut surfaces can be guaranteed, so there is no need to distinguish between the front and back during assembly.

[0029] Compared with the prior art, the cutting tool provided by the present invention, which facilitates chip-free cutting, achieves chip-free cutting through the structural design of the cutting head 10. Specifically, due to the presence of the second cleaving portion 23 and the arc-shaped contour of the first cleaving portion 22, the cutting edge 21 has a guiding function when cutting into the workpiece, that is, gradually widening the two cut surfaces. The first cleaving portion 22 has a parabolic contour, which conforms to the trajectory of the cutting edge 21 when it enters the workpiece, thus making it more conducive to cleaving the two cut surfaces. When widening the two cut surfaces, since the first cleaving portion 22 has a straight contour, it will continuously widen the two cut surfaces instead of the cutting edge 21 continuously cutting the workpiece, thereby further avoiding the generation of chips. Since no chips are generated, the flatness of the two cut surfaces can be guaranteed, so there is no need to distinguish between the front and back during assembly, thereby improving production and assembly efficiency and saving materials.

[0030] The above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions or improvements within the spirit of the present invention are covered within the scope of the claims of the present invention.

Claims

1. A cutting tool that facilitates chip-free cutting, characterized in that: The cutting tool that facilitates chip-free cutting includes a clamping part and a cutting head disposed at one end of the clamping part. The cutting head includes a cutting edge, a first cleaving part located on one side of the cutting edge, and a second cleaving part located on the other side of the cutting edge. During cutting, the workpiece rotates. The outline of the first cleaving part is parabolic in a cross-section along the plane of rotation of the workpiece, straight in a cross-section perpendicular to the plane of rotation of the workpiece and parallel to the alignment direction of the cutting head and the clamping part, and arc-shaped in a cross-section perpendicular to the plane of rotation of the workpiece and perpendicular to the alignment direction of the cutting head and the clamping part. The second cleaving part has a rounded chamfer with a radius less than or equal to 0.2 mm.

2. The cutting tool as described in claim 1, which facilitates chip-free cutting, is characterized in that: The cutting tool is made of tungsten steel.

3. The cutting tool as described in claim 1, which facilitates chip-free cutting, is characterized in that: The cutting tool is used to cut polymer materials.

4. The cutting tool as described in claim 1, which facilitates chip-free cutting, is characterized in that: On a cross section perpendicular to the plane of rotation of the workpiece being cut and parallel to the arrangement direction of the blade head and the clamping part, the angle between the outline of the first cleaving part and the plane of rotation of the workpiece being cut is between 8 degrees and 16 degrees.

5. The cutting tool as described in claim 1, which facilitates chip-free cutting, is characterized in that: The first split section is manufactured by grinding with a grinding wheel, and the clamping part is held by the output end of a motor.

6. The cutting tool as described in claim 5, which facilitates chip-free cutting, is characterized in that: During grinding, the central axis of the rotating shaft of the grinding wheel forms an acute angle with the arrangement direction of the tool head and the clamping part.

7. The cutting tool as described in claim 6, which facilitates chip-free cutting, characterized in that: The acute angle is between 8 and 16 degrees.

8. The cutting tool as described in claim 1, which facilitates chip-free cutting, is characterized in that: When the cutting tool is in use, the workpiece to be cut is clamped on a rotating fixture, and the arrangement direction of the cutting head and the clamping part is perpendicular to the rotation axis of the workpiece to be cut.

9. The cutting tool as described in claim 8, which facilitates chip-free cutting, characterized in that: The part to be cut includes product material and cutting waste, with the second split portion facing the product material.

10. The cutting tool as described in claim 1, which facilitates chip-free cutting, characterized in that: The clamping part is flat.

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