JPH1128601A - Cutting method - Google Patents

Abstract

(57) [Summary] [PROBLEMS] When performing cutting with a constant cutting amount of a cutting tool for a work, burrs are generated on the end face of the work, so that burrs must be removed after the cutting. SOLUTION: A cutting tool is controlled so that a cutting amount of a cutting tool with respect to a work is set to a desired value at the beginning of one cutting stroke, gradually reduced in a cutting direction, and finally reduced to zero. The workpiece was cut to prevent burrs.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a cutting method for processing a work using a numerically controlled lathe (hereinafter, referred to as an N / C lathe).

[0002]

2. Description of the Related Art First, a conventional cutting method will be described with reference to FIG. In FIG. 3, reference numeral 1 denotes a motor which constitutes a part of an N / C lathe and serves as a drive source for rotating a rotary shaft 2. , N / C). Reference numeral 4 denotes a work attached to one end of the rotary shaft 2 directly or via a holder (not shown). Reference numeral 5 denotes a rotation shaft of the rotation shaft 2 and a work 4 attached to the rotation shaft 2. The rotation shaft 2 and the work 4 are rotated by the motor 1 in, for example, the direction of arrow 6. A cutting tool 7 is supported by a drive mechanism (not shown), and the drive mechanism is controlled by the N / C 3.

In such a configuration, in FIGS. 3A and 3B, a required cutting amount is given to the tool 7 based on a control command from the N / C 3. FIG.
In (a), the tool 7 moves while cutting while maintaining a predetermined cutting amount in a direction of an arrow 8 indicating a cutting locus in parallel with the rotation center axis 5, and processes the work 4 so as to have a desired size. I do. On the other hand, in FIG. 3B, the tool 7 performs cutting while maintaining a predetermined cutting amount in the direction of the arrow 9 indicating the cutting trajectory in the opposite direction to FIG. 3A.

[0004]

FIG. 3 (a)
As shown in FIGS. 3B and 3B, when the cutting amount of the tool 7 with respect to the work 4 is constant in the one-way cutting process, a small hook-like burr 10 is provided at the end A of the work 4 in FIG. Occurs. In order to remove the burr 10, if the cutting amount of the tool 7 is kept constant and cutting is performed in the opposite direction to the arrow 8 indicating the cutting locus, the same burr is generated at the end B of the work 4, and the burr is easily generated. It cannot be removed. On the other hand, in FIG. 3B, a small hook-like burr 11 is formed at the end B of the work 4. In order to remove the burr 11, if the cutting amount of the tool 7 is kept constant and cutting is performed in the opposite direction to the arrow 9 indicating the cutting locus, the same burr is generated at the end A of the work 4, and the burr is easily formed. It cannot be removed.

[0005] Thus, in a one-way cutting process,
If the cutting amount of the tool with respect to the work is constant, burrs are generated at the ends of the work, so that burrs must be removed after cutting. That is, regarding the outer shape, inner diameter, and burr generated at the end of the groove of the work machined by the N / C lathe, for example, use a ten-fold loupe and pay close attention not to damage the machined work. While removing the burrs.

[0006]

The cutting amount of the cutting tool with respect to the workpiece is set to a desired value at the beginning of one cutting stroke, gradually reduced in the cutting direction, and finally reduced to zero. Cutting the work by controlling the cutting tool,
Prevents burrs.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIGS. 1 (a) and (b) correspond to FIG.
FIG. 3 shows Embodiment 1 of the present invention corresponding to (b) and (b), in which 1 to 7, A and B are the same as those shown in FIG. 1A and 1B, the cutting amount of the tool 7 with respect to the workpiece 4 is set to a desired value at the beginning of one cutting stroke, is gradually reduced in the cutting direction, and finally is reduced to zero. The tool 7 is controlled by the N / C 3 so that N / C3
Can be done by a cutting program that is processed in
This can be performed by controlling a drive mechanism that holds the tool 7 by a tool control command based on the program. It should be noted that the 12, 1 shown in FIGS.
Reference numeral 3 denotes a locus of cutting in the present invention, which schematically indicates a change in the cutting amount of the tool 7 with respect to the work 4.

Embodiment 2 FIGS. 2A to 2D show a second embodiment of the present invention. In the figure, reference numeral 4 denotes a work. Here, for the sake of convenience, the diameter of the columnar work 4 is set to 60 mm, one side of the cross section of the work 4 divided by the rotation center axis 5 is shown in a plan view, and its outer peripheral surface is required. The case where the workpiece is finished to a desired size by cutting and removing by an amount is illustrated. The radius of the work 4 before processing is 30mm
And it is assumed that the radius is cut by 0.5 mm and removed. The portion to be cut is a portion indicated by a hatched portion in the figure. 2B, the cutting amount of the tool 7 at the end surface B of the work 4 is set to 0.5 mm, and the cutting amount of the tool 7 from the end surface B of the work 4 toward the end surface A is gradually increased. End face A
Is controlled so that the cutting amount at becomes zero. As a result, the portion B in the hatched portion A is removed, and the portion C remains. Next, as shown in a cutting locus 13 (a locus in the opposite direction to the locus 12) in FIG.
The cutting amount of the tool 7 at the end face A of the work 4 is also set to 0.55 mm, the cutting amount of the tool 7 is gradually reduced from the end face A of the work 4 toward the end face B, and the cut amount at the end face B becomes zero. By controlling so as to be, the hatched portion C is removed. And
Eventually, all of the portion A in FIG. 2A is removed, and FIG.
(D). The radius of the work 4 is the first 30mm
From 29.5 mm, that is, the diameter of the work 4 is the first 6
It is processed from 0 mm to 59 mm. In this way, as shown by the cutting trajectories 12 and 13, the tool 7 is controlled so as to cut the work 4 at the end of one cutting stroke so that the cutting amount becomes zero, so that no burrs are generated at both ends of the work.

[0009]

According to the cutting method of the present invention, it is possible to cut a work so that burrs do not occur on the end face of the work. Therefore, there is no need to remove the burrs after cutting as in the related art, and there is an effect that the product processing efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a diagram for describing Embodiment 1 of the present invention.

FIG. 2 is a diagram for explaining Embodiment 2 of the present invention.

FIG. 3 is a diagram illustrating an example of a conventional method.

[Explanation of symbols]

Reference Signs List 1 motor, 2 rotation axes, 3 numerical control device, 4 work, 5 rotation center axis, 7 cutting tool, 8 trajectories, 9 trajectories, 10 burrs, 11 burrs, 12 trajectories, 13
Locus, A end face, B end face.

Claims (2)

[Claims] 1. A cutting method using a numerically controlled lathe for cutting an outer peripheral surface of a work while moving the work in a direction parallel to a rotation center axis while rotating the work, wherein a cutting amount of the cutting tool with respect to the work is cut. A cutting method characterized in that cutting is performed while being controlled to gradually decrease in a direction. 2. A cutting method using a numerically controlled lathe for cutting an outer peripheral surface of a work while moving the tool in a direction parallel to a rotation center axis while rotating the work. The amount is a value at which the finished size of the work is obtained, and the amount of cut is gradually reduced in the process of cutting movement of the tool from one end of the work to the other end so that the amount of cut becomes zero at the other end of the work. And then moving the tool from the other end of the work to one end by controlling the tool so that the tool has a cutting locus opposite to the movement from one end to the other end of the work. A cutting method characterized by the following.