JPH068026A - Cutting by end mill - Google Patents

Abstract

PURPOSE:To provide a stable cutting state by way of increasing cutting resistance in the axial direction, decreasing main component force and reducing fall as well as heightening cutting efficiency by delivering a milling cutter tool with a shank having cutting blades on its top end and its outer periphery longitudinally and laterally simultaneously by way of moving the milling cutter tool slantingly. CONSTITUTION:By using a milling cutter tool with a shank having cutting blades 3, 9 on its top end and its outer periphery, fluting and/or shaping are/is carried out. At this time, the milling cutter tool is slantingly moved at inclination 1 deg.-45 deg. and simultaneously delivered longitudinally and laterally. Consequently, as cutting at a rotational central part is smoothly carried out, it is possible to carry out deep recessing in one process. That is, a required groove is cut by delivering this tool simultaneously longitudinally and laterally from one end of the groove to the other end, and when the tool reaches the other end, the tool is reversed and the groove is cut in the same way. When the groove is cut in through depth, by delivering the tool only laterally, desired groove recessing is completed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a milling machine, and more particularly to a holder and a throw-away tip, and more particularly to a machining method applied to spiral machining, pocket machining and the like.

[0002]

2. Description of the Related Art Conventionally, in order to manufacture a groove that does not reach the outer edge of a work piece, there is a type in which a hole is not so deeply formed, and then the feed direction is changed and cutting is performed in a direction perpendicular to the preceding hole forming direction. Mainstream. These include, for example, grooves for receiving adjustment springs. In this method, first, one end of the groove of the work piece is seated, a hole is bored, and then cutting is performed toward the other end of the groove of the tool. Therefore, the shank is moved again at right angles to the axis and the cutting is repeated toward the starting point of the groove.

However, in the conventional tool, the axial feed (drilling depth) performed during the drilling work is limited to a few tenths of 1 mm, and as a result, the above-described drilling work and the subsequent cutting are few. A groove cannot be formed unless it is repeated a number of times, so that a considerable processing time is required.

[0004]

Therefore, shortening the machining time requires a great amount of time especially for vertical feed. Therefore, in order to reduce this time, a cutting method capable of simultaneous vertical and horizontal feed is examined. It was the invention. Simultaneous vertical / horizontal feeding is a cutting method that is often used in copying processing such as ball end mills, but it has hardly been used in squeeze end mills, especially groove cutting. One of the reasons for this is that in this type of throw-away tool, a regular triangular tip is often used and cutting is performed mainly with an outer peripheral cutting edge.

[0005]

Therefore, the cutting method of the present invention is a cutting method in which a lateral feed is inclined by using a throw-away tool in which a tip is arranged so that the lateral feed is inclined. To provide. In the cutting method of the present invention, since the cutting at the center of rotation is smoothly performed, deeper groove machining than in the past can be performed in one step. That is, the groove is formed by first feeding from the one end of the required groove to the other end while feeding it vertically and horizontally at the same time, and when reaching the other end, invert the tool and perform the same cutting to cut the groove to the full depth. Then, it is done by only lateral feed.

The angle of inclined cutting is set to 1 to 45 °, if it is less than 1 °, there is not much difference from the cutting method by the conventional end mill, and if it exceeds 45 °, problems such as interference are likely to occur. Since there is a problem with the amount of protrusion and the like, the above range is set. When performing inclined cutting, since the bottom blade also cuts at the same time, it is always in contact with the work material, which improves the balance during cutting and reduces vibration and chatter. In case of only lateral feed, it can be cut as usual. Hereinafter, detailed description will be given with reference to examples.

[0007]

EXAMPLES The present invention will be described in detail below based on examples. FIG. 1 shows an example of a cutting method according to the present invention.
FIG. 1 shows a case where the blind groove is obliquely cut, but from one end, it is fed at an angle of several degrees to the blind side, is fed to the blind side, is reversed at the blind side and returns to the original position, and the same operation is repeated By doing so, grooving is performed. 2 and 3
Shows the end mill used for the same process, shank 1
Has a tip seat 2 for accommodating a TA tip made of cemented carbide at its front end. The TA chip 3 has a diamond shape. Each edge of this diamond shape forms a cutting edge.

A TA tip 3 is provided at the front end of the shank 1 with its effective blade extending in the radial direction from the periphery of the shank 1 toward its axis, and is inclined at an angle of 10 ° from its radial outer end to its radial inner end. There is. Further, a chamfering blade is attached to a corner portion at a portion overlapping with the axis to perform cutting at a rotation center portion. At the front end of the shank in the other tip seat, which is offset from the tip seat 2 by 180 ° around the shank, a second TA tip, the effective blade of which is also the first
It is arranged in the same manner as the TA chip. However, since the center cutting is not performed, the TA tip is slightly smaller and no chamfering blade is provided.

The procedure is as follows: the cutting tool according to the present invention is fed simultaneously in the vertical and horizontal directions to carry out the machining, and if the desired cutting depth is larger than the axial cutting edge length of the first TA tip. , On the same radius as the first TA tip 2 and then axially offset it, install the third TA tip with its effective blade parallel to the axis A of the shank, or repeat vertical and horizontal feeds several times. By doing.

The effect of performing vertical / horizontal simultaneous feeding is as follows.
Not only the time is shortened, but also the cutting resistance is greatly changed as shown in FIG. Fig. 4 shows a cutting speed of 100m / m
In, the feed rate is 0.1 mm / blade, the inclination angle is 5 °, and the cutting resistance is measured by cutting with a cutting depth of 0 to 3 mm. In addition, general cutting was performed with a cutting depth of 3 mm.
From Fig. 4, cutting feed force (component force acting in feed direction)
, But the main component force (component force acting on the holder at right angles to the feed direction) decreases, and the back component force (component force acting on the holder axial direction) increases at almost the same ratio. I understand.

That is, in inclined cutting, the holder receives a large force in the axial direction, but this component force merely presses the holder against the arbor and has little influence on the performance and dimensions. Further, the reduction of the main component force reduces the tilt of the holder, and also has the effect of suppressing the occurrence of vibration and chatter, thereby reducing chipping and chipping of the cutting edge. Although the example of grooving has been described, it goes without saying that the method of the present application can also be used for shoulder shaving, particularly spiral processing, pocket processing, copying processing when enlarging a large diameter hole, and the like.

[0012]

As described above, the cutting method of the present invention uses a throw-away end mill in which a peripheral blade and a bottom blade are provided with cutting blades, and inclines 1 ° to 45 ° simultaneously in the vertical and horizontal directions. The cutting efficiency is improved by feeding. Also, the cutting resistance increases in the axial direction due to the inclined cutting,
Since the main component force is reduced, tilting is reduced and a stable cutting state can be obtained.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a processing example of inclined cutting according to the present invention.

FIG. 2 shows an example of a throw-away tool for performing the processing shown in FIG.

FIG. 3 is an explanatory view of a main part of FIG.

FIG. 4 is an explanatory diagram showing cutting resistance during inclined cutting.

[Explanation of symbols]

 1 Shank 2 Tip seat 3 TA tip (parent blade) 7 Chip pocket 8 Set screw 9 TA tip (child blade)

Claims (2)

[Claims] 1. A cutting method using an end mill, wherein a milling tool with a shank having a cutting edge at the tip and the outer periphery is used to feed the tool vertically and horizontally at the same time in grooving and / or shoulder milling. . 2. A cutting method for an end mill according to claim 1, wherein the simultaneous vertical / horizontal feed is performed at an angle of 1 ° to 45 °.