Method of knurling the exterior surface of a workpiece using CNC composite lathe

Abstract

The present invention relates to a method for knurling the outer surface of a workpiece using a CNC multi-lathe, and more particularly to a method for knurling the outer surface of a workpiece using a CNC multi-lathe to form knurling with an uneven shape on the outer surface of a cylindrical workpiece. The present invention is characterized by one or more of a workpiece or a cutting tool moving linearly in a direction relative to each other to cut a portion of the outer circumference of the workpiece in a straight shape, thereby forming straight-shaped knurling on the outer circumference of the workpiece, and rotating the workpiece to form a plurality of knurlings on the outer circumference of the workpiece.

Description

Technology Field

[0001] The present invention relates to a method for knurling the outer surface of a workpiece using a CNC multi-lathe, and more particularly to a method for knurling the outer surface of a workpiece using a CNC multi-lathe to form an uneven knurling pattern on the outer surface of a cylindrical workpiece. Background Technology

[0002] Generally, conventional knurling tools have knurling processing rollers attached to the body, which rotate and pressurize the surface of the material requiring knurling to form irregularities on the material.

[0003] Here, knurling refers to a process of forming irregularities on the outer surface of a material to create patterns such as straight lines or intersecting lines.

[0004] In this knurling operation, after fixing the material to the chuck, the knurling processing roller is pressed against the material while the material is rotated to form irregularities on the outer surface of the material, thereby forming irregularities of a certain pitch on the surface of the processing roller so that irregularities corresponding to the shape of the roller surface are formed on the surface of the material.

[0005] In the case where the workpiece material is a metal with low hardness, such as aluminum, knurling can be easily formed using the roller method described above.

[0006] However, in the case of workpiece materials made of high-hardness metals such as iron or SUS, there was a problem in that knurling was not properly formed on the outer surface of the workpiece using the conventional roller method. Prior art literature

[0007] Registered Patent 10-2386910 The problem to be solved

[0008] The present invention aims to solve the aforementioned problems by providing a method for knurling the outer surface of a workpiece using a CNC composite lathe, which enables easy and clean knurling even on the outer surface of a high-hardness metal. means of solving the problem

[0009] To achieve the above objective, the method for knurling the outer surface of a workpiece using a CNC composite lathe according to the present invention comprises: a gripping step of gripping a hollow cylindrical workpiece using a CNC composite lathe; a tool placement step of placing a cutting tool on the upper side of one side of the workpiece; a cutting step in which one or more of the cutting tool and the workpiece move linearly in a horizontal direction relative to each other to cut a portion of the outer surface of the workpiece in a straight line shape; a retraction step in which the horizontally moved part of the cutting tool and the workpiece moves back to its original position; and a rotation step in which the workpiece is rotated by a predetermined angle using a CNC composite lathe; wherein a straight-shaped knurling is formed on the outer surface of the workpiece by the cutting step, and after the rotation step, the method moves to the cutting step and repeats the following steps to form a plurality of knurlings on the outer surface of the workpiece.

[0010] The above cutting step involves the cutting tool moving horizontally from one side of the workpiece to the other side to cut a portion of the outer surface of the workpiece, and the above retraction step involves the moved cutting tool retracting from the other side of the workpiece to one side.

[0011] The above cutting step involves the workpiece moving horizontally toward the cutting tool while cutting a portion of the outer surface of the workpiece, and the above retraction step involves the moved workpiece retracting in a direction away from the cutting tool.

[0012] The method further comprises a separation step positioned between the cutting step and the retraction step, wherein the workpiece is lowered or the cutting tool is raised to separate the workpiece and the cutting tool; and a restoration step, wherein the workpiece lowered after the retraction step is raised to its original position or the raised cutting tool is lowered to its original position; wherein the restoration step is performed before or after the rotation step.

[0013] The lower surface of the cutting tool is formed in an arc shape corresponding to the outer circumference of the workpiece, and a plurality of cutting grooves and cutting protrusions are repeatedly formed on the lower surface of the arc-shaped cutting tool, and the cutting grooves and cutting protrusions are formed elongated along the direction of movement of the cutting tool or the workpiece.

[0014] In the tool placement step, the cutting tool is positioned at an angle such that its upper end is closer than its lower end in the direction in which the workpiece is positioned, and in the cutting step, the cutting tool positioned at an angle cuts the outer surface of the workpiece with the shear of its lower end. Effects of the invention

[0016] According to the method for knurling the outer surface of a workpiece using the CNC composite lathe of the present invention as described above, the following effects are achieved.

[0017] By the knurling method of the present invention, knurling can be easily and cleanly formed even on the outer surface of a workpiece made of a high-hardness metal material. Brief explanation of the drawing

[0018] FIG. 1 is a flowchart of a method for knurling the outer surface of a workpiece according to an embodiment of the present invention. FIG. 2 is a drawing of a cutting tool for performing a knurling method on the outer surface of a workpiece according to an embodiment of the present invention. FIG. 3 is a process diagram of a method for knurling the outer surface of a workpiece according to an embodiment of the present invention. FIG. 4 is a photograph of a workpiece after the outer surface knurling method according to an embodiment of the present invention. Specific details for implementing the invention

[0019] The method for knurling the outer surface of a workpiece using a CNC composite lathe according to the present invention comprises, as shown in FIG. 1, a gripping step (S1), a tool placement step (S2), a cutting step (S3), a retraction step (S5), a rotation step (S7), etc.

[0020] The above gripping step (S1) is a step of gripping a hollow cylindrical workpiece (10) using a CNC composite lathe as shown in FIG. 3(a).

[0021] A workpiece (10) is firmly held using a chuck or similar device equipped on a CNC multi-lathe.

[0022] The above tool placement step (S2) is a step of placing a rod-shaped cutting tool (20) on one side of the workpiece (10) as shown in FIG. 3(a).

[0023] As shown in FIG. 2, the lower surface of the cutting tool (20), which is shaped like a rod, is formed in an arc shape corresponding to the outer surface of the workpiece (10).

[0024] A plurality of cutting grooves and cutting protrusions are repeatedly formed on the lower surface of the arc-shaped cutting tool (20).

[0025] The above cutting groove and cutting projection are formed lengthwise along the direction of movement of the cutting tool (20) or workpiece (10).

[0026] The above cutting step (S3) is a step in which at least one of the cutting tool (20) and the workpiece (10) moves in a straight line in a horizontal direction relative to each other as shown in FIG. 3(b) to cut a portion of the outer surface of the workpiece (10) into a straight shape.

[0027] This cutting step (S3) is performed automatically by the CNC multi-lathe.

[0028] A straight knurling is formed on the outer surface of the workpiece (10) by the above cutting step (S3).

[0029] The lower surface of the cutting tool (20) is formed in an arc shape, and a plurality of cutting grooves and cutting protrusions are repeatedly formed on the lower surface of the cutting tool (20). By the relative linear movement of the cutting tool (20) and the workpiece (10), a plurality of linear protrusions are formed on the outer surface of the workpiece (10) in a single process, thereby allowing a plurality of knurlings to be easily and quickly formed on the outer surface of the workpiece (10).

[0030] As shown in FIG. 3(a), in the tool placement step (S2), the cutting tool (20) is positioned at an angle such that the upper part is closer than the lower part in the forward direction where the workpiece (10) is placed.

[0031] And, the cutting tool (20) positioned at an angle cuts the outer surface of the workpiece (10) with a lower shear in the cutting step (S3).

[0032] That is, when the cutting tool (20) is moved to the upper part of the workpiece (10), the cutting tool (20) cuts the outer surface of the workpiece (10) while tilted slightly forward rather than vertically with respect to the workpiece (10) placed at the lower part.

[0033] Through this, the cutting tool (20) can more easily cut the outer surface of the workpiece (10) to form a clean and high-quality knurling.

[0034] The above retraction step (S5) is a step in which the cutting tool (20) and the workpiece (10) that have moved in the horizontal direction are moved back to their original positions, as illustrated in FIG. 3(d).

[0035] This retraction step (S5) is automatically performed by the CNC composite lathe.

[0036] In FIG. 3, the cutting step (S3) is illustrated such that the cutting tool (20) moves horizontally from one side of the workpiece (10) to the other side to cut a portion of the outer surface of the workpiece (10), and the retraction step (S5) is illustrated such that the moved cutting tool (20) retracts from the other side of the workpiece (10) to one side.

[0037] Alternatively, the cutting step (S3) may cut a portion of the outer surface of the workpiece (10) while the workpiece (10) moves horizontally toward the cutting tool (20), and the retraction step (S5) may cause the moved workpiece (10) to retract in a direction away from the cutting tool (20).

[0038] When the cutting tool (20) moves and the workpiece (10) is fixed, it is easy to supply cutting fluid, etc. to the workpiece (10) in a fixed manner.

[0039] In addition, when the above workpiece (10) moves and the above cutting tool (20) is fixed, the above cutting tool (20) can be firmly fixed in an accurate position, so that the operator can easily determine whether the cutting tool (20) is worn or damaged.

[0040] The above rotation step (S7) is a step of rotating the cylindrical workpiece (10) by a predetermined angle using a CNC composite lathe as shown in FIG. 3(e).

[0041] After the rotation step (S7), proceed to the cutting step (S3) and repeat the following steps.

[0042] By repeating the above process, a plurality of knurling can be rapidly formed on the entire outer surface of the cylindrical workpiece (10).

[0043] The present invention may further include a separation step (S4) and a restoration step (S6) for smooth knurling operations.

[0044] The above separation step (S4) is positioned between the above cutting step (S3) and the above retraction step (S5).

[0045] The above separation step (S4) is a step of separating the workpiece (10) and the cutting tool (20) by lowering the workpiece (10) or raising the cutting tool (20) after the above cutting step (S3).

[0046] In this embodiment, as shown in FIG. 3(c), the cutting tool (20) is raised to separate the workpiece (10) from the cutting tool (20).

[0047] The above restoration step (S6) is performed after the above retreat step (S5) and can be performed before or after the above rotation step (S7).

[0048] In the above restoration step (S6), the lowered workpiece (10) is raised back to its original position or the raised cutting tool (20) is lowered back to its original position so that the workpiece (10) and the cutting tool (20) are restored to the positions of the above gripping step (S1) and tool placement step (S2).

[0049] The above separation step (S4) and restoration step (S6) are also performed by a CNC composite lathe.

[0050] With the knurling method of the present invention as described above, knurling can be easily, quickly, and cleanly formed on the outer surface of a workpiece (10) made of a metal material (iron, SUS, etc.) with high hardness.

[0052] The method for knurling the outer surface of a workpiece using a CNC composite lathe according to the present invention is not limited to the aforementioned embodiments and can be implemented with various modifications within the scope permitted by the technical concept of the present invention. Explanation of the symbols

[0053] S1: Gripping stage, S2: Tool placement stage, S3: Cutting stage, S4: Separation stage, S5: Retraction stage, S6: Restoration stage, S7: Rotation stage, 10 : Workpiece, 20 : Cutting tool,

Claims

Claim 1 The method comprises: a gripping step of gripping a hollow cylindrical workpiece using a CNC multi-lathe; a tool placement step of placing a rod-shaped cutting tool on the upper side of one side of the workpiece; a cutting step in which one or more of the cutting tool and the workpiece move linearly in a horizontal direction relative to each other to cut a portion of the outer surface of the workpiece in a straight line shape; a retraction step in which the horizontally moved part of the cutting tool and the workpiece moves back to its original position; and a rotation step in which the workpiece is rotated by a predetermined angle using a CNC multi-lathe; wherein a straight-shaped knurling is formed on the outer surface of the workpiece by the cutting step, and after the rotation step, the cutting step is performed repeatedly to form a plurality of knurlings on the outer surface of the workpiece, and the lower surface of the cutting tool is formed in a concave arc shape corresponding to the outer surface of the workpiece, and a plurality of cutting grooves and cutting protrusions are repeatedly formed on the lower surface of the cutting tool with the concave arc shape, and the cutting grooves and cutting protrusions are long along the direction of movement of the cutting tool or the workpiece. A method for knurling the outer surface of a workpiece using a CNC composite lathe, wherein, in the tool placement step, the cutting tool formed in a rod shape is positioned so that its upper portion is closer than its lower portion in the forward direction where the workpiece is placed, and when the cutting tool moves to the upper portion of the workpiece, the cutting tool cuts the outer surface of the workpiece while tilted forward rather than vertically with respect to the workpiece placed at the lower portion, and in the cutting step, the cutting tool positioned at an angle cuts the outer surface of the workpiece with the lower portion's front portion. Claim 2 A method for knurling the outer surface of a workpiece using a CNC composite lathe according to claim 1, wherein the cutting step involves the cutting tool moving horizontally from one side of the workpiece to the other side while cutting a portion of the outer surface of the workpiece, and the retraction step involves the moved cutting tool retracting from the other side of the workpiece to one side. Claim 3 A method for knurling the outer surface of a workpiece using a CNC multi-lathe, wherein, in claim 1, the cutting step involves cutting a portion of the outer surface of the workpiece while the workpiece moves horizontally toward the cutting tool, and the retraction step involves the moved workpiece retracting toward the cutting tool. Claim 4 A method for knurling the outer surface of a workpiece using a CNC multi-lathe, wherein, in claim 1, the method further comprises a separation step disposed between the cutting step and the retraction step, wherein the workpiece is lowered or the cutting tool is raised to separate the workpiece and the cutting tool; and a restoration step, wherein the workpiece lowered after the retraction step is raised to its original position or the raised cutting tool is lowered to its original position; wherein the restoration step is performed before or after the rotation step. Claim 5 delete Claim 6 delete

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