Cutter beneficial to realizing chipless cutting

Abstract

A cutter beneficial to realizing chipless cutting comprises a clamping part and a cutter head part arranged at one end of the clamping part. The cutter head part comprises a cutting edge, a first split part located on one side of the cutting edge and a second split part located on the other side of the cutting edge. During cutting, the cut piece rotates, and the contour line of the first split part on the section of the plane where the first split part rotates along the cut piece is a parabola. And the contour line of the first splitting part on the section perpendicular to the rotating plane of the cut piece and parallel to the arrangement direction of the tool bit part and the clamping part is a straight line. And an arc line of the first split part is arranged on a section which is vertical to a plane where the cut piece rotates and is vertical to the arrangement direction of the tool bit part and the clamping part. The second split part is an arc chamfer, and the radius of the arc chamfer is smaller than or equal to 0.2 mm. According to the cutter, through the structural design of the cutter head part, chipless cutting is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile parts, in particular to a tool which is conducive to realizing chipless cutting. Background Art

[0002] Piston rings made of polymer materials such as plastic, PTFE, rubber and other materials are widely used in cylinder pistons of different types of air compressors. The piston ring relies on its own tension to make the piston stick to the inner surface of the cylinder to prevent suction and exhaust from both ends of the cylinder. Therefore, the piston ring can avoid the effect of reducing the roundness or cylindricity of the cylinder and piston due to direct friction between the piston and the cylinder wall.

[0003] At present, the production method of PTFE piston rings is generally through turning. In traditional turning and cutting, the cutter has a certain thickness, which will cause material waste. At the same time, the chips formed during cutting will wrap around the cutter, resulting in uneven cutting surfaces of the product. In addition, in order to ensure the quality of the product, the flatness of one surface is usually guaranteed at the expense of the flatness of the other surface. Therefore, it is necessary to distinguish the front and back sides of the piston ring during the assembly process, and post-processing is required. Undoubtedly, it reduces production efficiency and increases product costs. Summary of the invention

[0004] In view of this, the present invention provides a tool that can solve the above-mentioned problems and is conducive to achieving chipless cutting.

[0005] A tool that is conducive to achieving chipless cutting, comprising a clamping portion and a blade head portion arranged at one end of the clamping portion. The blade head portion comprises a blade, a first splitting portion located on one side of the blade, and a second splitting portion located on the other side of the blade. When cutting, the workpiece to be cut rotates, and the contour line of the first splitting portion on the cross section along the plane in which the workpiece to be cut rotates is a parabola. On the cross section perpendicular to the plane in which the workpiece to be cut rotates and parallel to the arrangement direction of the blade head portion and the clamping portion, the contour line of the first splitting portion is a straight line. On the cross section perpendicular to the plane in which the workpiece to be cut rotates and perpendicular to the arrangement direction of the blade head portion and the clamping portion, the contour line of the first splitting portion is a circular arc. The second splitting portion is an arc chamfer, and the radius of the arc chamfer is less than or equal to 0.2 mm.

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

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

[0008] Furthermore, in a cross section perpendicular to the plane on which the cut piece rotates and parallel to the arrangement direction of the cutter head and the clamping portion, an angle between a contour line of the first splitting portion and the plane on which the cut piece rotates is between 8 degrees and 16 degrees.

[0009] Furthermore, when manufacturing the first splitting portion, it is ground by a grinding machine, and the clamping portion is clamped by an output end of a motor.

[0010] Furthermore, during grinding, an acute angle is formed between the central axis of the rotating shaft of the grinding machine and 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 in use, the object to be cut is clamped on a rotating fixture, 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 object to be cut includes product material and cutting waste, and the second splitting portion faces the product material.

[0014] Furthermore, the clamping portion is in the shape of a flat plate.

[0015] Compared with the prior art, the tool provided by the present invention is conducive to achieving chipless cutting by means of the structural design of the tool head, thereby achieving chipless cutting. Specifically, due to the existence of the second splitting portion and the first splitting portion having an arc-shaped profile, the blade has a guiding effect when cutting into the object to be cut, that is, gradually spreading the two cut surfaces, and the first splitting portion has the parabolic profile, which conforms to the trajectory of the blade inserting into the material to be cut, thereby being more conducive to splitting the two cut surfaces. When the two cut surfaces are spread apart, since the first splitting portion has the straight line profile, the two cut surfaces will be spread apart all the time, rather than the blade cutting the material all the time, 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 sides during assembly, thereby improving production and assembly efficiency and saving materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the three-dimensional structure of a tool provided by the present invention that is conducive to chipless cutting.

[0017] Figure 2 for Figure 1 Schematic diagram of the side structure of a tool that is conducive to chipless cutting.

[0018] Figure 3 for Figure 2Schematic diagram of the partial enlarged structure of the tool at A that is conducive to chipless cutting.

[0019] Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure of the tool along line BB that is conducive to chipless cutting.

[0020] Figure 5 for Figure 1 Schematic diagram of the front structure of a tool that is conducive to chipless cutting. DETAILED DESCRIPTION

[0021] The specific embodiments of the present invention are further described in detail below. It should be understood that the description of the embodiments of the present invention herein is not intended to limit the protection scope of the present invention.

[0022] like Figures 1 to 5 As shown, it is a schematic diagram of the structure of a tool that is conducive to chipless cutting provided by the present invention. The tool that is conducive to chipless cutting includes a clamping portion 10 and a cutter head 20 arranged at one end of the clamping portion 10. It can be imagined that the tool that is conducive to chipless cutting also includes some other functional structures, such as a clamping structure for clamping the clamping portion 10 to a tool, a groove for increasing the clamping fixing effect, etc., which are well known to those skilled in the art and will not be described in detail here.

[0023] The tool that is conducive to achieving chipless cutting can be made of hard metal materials, such as high-speed steel, high-manganese steel, tungsten steel, etc., so that it can achieve the characteristics of sharpness, high hardness and wear resistance. The tool is used for cutting polymer materials.

[0024] The clamping portion 10 is integrally formed with the cutter head 50, that is, the cutter head 50 is directly formed on the clamping portion 10. Of course, it is conceivable that when tungsten steel needs to be saved, the clamping portion 10 can be made of general steel, such as carbon steel. Then the cutter head 50 is welded to the clamping portion 10. The clamping portion 10 can be in the shape of a flat plate, and the cutter head 20 is directly formed by grinding at the end of the clamping portion 10 by a grinder. In this embodiment, the width of the clamping portion 10 is 10 mm, the length is 100 mm, and the thickness is 2 mm.

[0025] The cutter head portion 20 includes a blade 21, a first splitting portion 22 located on one side of the blade 21, and a second splitting portion 23 located on the other side of the blade 21. The blade 21 is formed by processing the first and second splitting portions 22, 23, so the structure and manufacturing method of the first and second splitting portions 22, 23 are first described. Since the cutter head portion 20 is used to cut the workpiece, the structure of the cutter head portion 20 should be based on the workpiece. It can be understood that when cutting the workpiece, such as a piston ring, the tool is fixed, and the workpiece is rotating, and the workpiece rotates around a central axis. The contour line of the first splitting portion 22 in the cross section along the plane where the workpiece rotates is a parabola, such as Figure 5 As shown. On a cross section perpendicular to the plane of rotation of the cut piece and parallel to the arrangement direction of the cutter head 20 and the clamping portion 10, the contour line of the first splitting portion 22 is a straight line, as shown in FIG. Figure 2 As shown. The contour line of the first splitting portion 22 on the cross section perpendicular to the plane of rotation of the cut piece and parallel to the arrangement direction of the cutter head 20 and the clamping portion 10, that is, the angle between the straight line and the plane of rotation of the cut piece is between 8 and 16 degrees, and the angle can be set according to the thickness of the part and the requirements of flatness. In this embodiment, the angle is 10 degrees. The arc line of the first splitting portion 22 on the cross section perpendicular to the plane of rotation of the cut piece and perpendicular to the arrangement direction of the cutter head 20 and the clamping portion 10, as shown Figure 4 As shown. When manufacturing the first splitting portion 22, it is ground by a grinding machine. Specifically, the clamping portion 10 is clamped by the output end of a motor. During grinding, there is an acute angle between the central axis of the rotating shaft of the grinding machine and the arrangement direction of the cutter head 10 and the clamping portion 10, and the acute angle is between 8 degrees and 16 degrees. At the same time, during grinding, the clamping portion 10 reciprocates along the arrangement direction of the cutter head 20 and the clamping portion 10 under the control of the motor, thereby forming the first splitting portion 22. At the same time, the arrangement direction of the cutter head 10 and the clamping portion 10 is parallel to the central axis of the rotating shaft of the grinding machine. When grinding the first splitting portion 22, until a very thin blade portion is formed.

[0026] The second splitting portion 23 is processed after the first splitting portion 22 is ground. It is formed by cutting with a round chamfering cutter. Therefore, the second splitting portion 23 is a circular chamfer with a radius less than or equal to 0.2 mm. Figure 3As shown. Since the second splitting portion 23 is only a circular chamfer, that is, the blade head 10 on one side of the second splitting portion 23 basically maintains a flat plate shape, which is conducive to ensuring the flatness of the cutting surface. At the same time, due to the existence of the second splitting portion 23, it has a guiding effect when the blade 21 cuts, especially since it is a circular chamfer, the guiding effect is better.

[0027] When the first splitting portion 22 and the second splitting portion 23 are processed, the blade 21 is also formed, so there is no need to explain it again. Since the contour line of the first splitting portion 22 in the cross section along the plane of rotation of the cut workpiece is a parabola, the blade 21 is also a parabola. Figure 5 shown.

[0028] When the tool is used, the object to be cut is clamped on a rotating fixture, such as an output shaft of a motor, and the rotating fixture can also be an internal support fixture. The motor drives the rotating fixture to rotate, thereby causing the object to be cut to rotate. The arrangement direction of the cutter head 20 and the clamping part 10 is perpendicular to the rotation axis of the object to be cut. It can be understood that the object to be cut includes product materials and cutting waste, and the second splitting part 23 faces the product materials. At the same time, since the tool provided by the present application can achieve a chip-free effect, it can directly cut a raw material tube, thereby using the tool to cut into multiple product materials, such as multiple piston rings. During cutting, the blade 21 not only cuts the object to be cut, but also has a guiding effect due to the presence of the second splitting part 23, thereby avoiding the generation of chips. If there is no second splitting part 23, if the blade 21 is always in a cutting state, chips will inevitably be generated. Because of the existence of mechanical errors and the fact that the blade 21 cannot remain in a straight line, it will inevitably produce a certain amount of jumping, which will result in the blade 21 not being able to cut in a straight line all the time during cutting, thereby generating chips. Since the first splitting portion 22 has the parabolic profile, it conforms to the trajectory of the blade 21 inserting into the material to be cut, which is more conducive to splitting the two cut surfaces. At the same time, since the first splitting portion 23 has an arc-shaped profile, it also has a guiding function, that is, gradually spreading the two cut surfaces. When spreading the two cut surfaces, since the first splitting portion 22 has the straight line profile, the two cut surfaces will be spread apart all the time, rather than the blade 21 always cutting the material to be cut, thereby 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 sides during assembly.

[0029] Compared with the prior art, the tool provided by the present invention is conducive to achieving chipless cutting by means of the structural design of the tool head 10, thereby achieving chipless cutting. Specifically, due to the existence of the second splitting portion 23 and the arc-shaped profile of the first splitting portion 22, the blade 21 has a guiding effect when cutting into the object to be cut, that is, gradually spreading the two cut surfaces, and the first splitting portion 22 has the parabolic profile, which conforms to the trajectory of the blade 21 inserting into the material to be cut, thereby being more conducive to splitting the two cut surfaces. When the two cut surfaces are spread apart, since the first splitting portion 22 has the straight line profile, the two cut surfaces will be spread apart all the time, rather than the blade 21 cutting the material to be cut all the time, 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 sides during assembly, thereby improving production and assembly efficiency and saving materials.

[0030] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modification, equivalent substitution or improvement within the spirit of the present invention is included in the scope of the claims of the present invention.

Claims

1. A tool that is conducive to chipless cutting, characterized in that: The tool that is conducive to achieving chipless cutting includes a clamping part and a blade head portion arranged at one end of the clamping part, the blade head portion includes a blade, a first splitting portion located on one side of the blade, and a second splitting portion located on the other side of the blade. When cutting, the cut piece rotates, and the contour line of the first splitting portion on the cross section along the plane of rotation of the cut piece is a parabola, and the contour line of the first splitting portion on the cross section perpendicular to the plane of rotation of the cut piece and parallel to the arrangement direction of the blade head portion and the clamping part is a straight line, and the first splitting portion on the cross section perpendicular to the plane of rotation of the cut piece and perpendicular to the arrangement direction of the blade head portion and the clamping part is a circular arc line, and the second splitting portion is a circular arc chamfer, and the radius of the circular arc chamfer is less than or equal to 0.2mm.

2. The tool for achieving chipless cutting according to claim 1, characterized in that: The cutter is made of tungsten steel.

3. The tool for achieving chipless cutting according to claim 1, characterized in that: The cutter is used for cutting polymer materials.

4. The tool for achieving chipless cutting according to claim 1, characterized in that: On a cross section perpendicular to the plane on which the cut piece rotates and parallel to the arrangement direction of the cutter head and the clamping portion, an angle between a contour line of the first splitting portion and the plane on which the cut piece rotates is between 8 degrees and 16 degrees.

5. The tool for achieving chipless cutting according to claim 1, characterized in that: When manufacturing the first splitting portion, it is ground by a grinding machine, and the clamping portion is clamped by an output end of a motor.

6. The tool for achieving chipless cutting according to claim 5, characterized in that: During grinding, an acute angle is formed between the central axis of the rotating shaft of the grinding machine and the arrangement direction of the cutter head and the clamping part.

7. The tool for achieving chipless cutting according to claim 6, characterized in that: The acute angle is between 8 degrees and 16 degrees.

8. The tool for achieving chipless cutting according to claim 1, characterized in that: When the tool is in use, the object to be cut is clamped on a rotating fixture, and the arrangement direction of the tool head and the clamping part is perpendicular to the rotation axis of the object to be cut.

9. The tool for achieving chipless cutting according to claim 8, characterized in that: The object to be cut includes product material and cutting waste, and the second splitting portion faces the product material.

10. The tool for achieving chipless cutting according to claim 1, characterized in that: The clamping portion is in the shape of a flat plate.

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