JPS6144608B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in an end mill cutting method and apparatus.

Generally, end mill cutting has problems with chip generation and evacuation. In other words, the chips generated from the cutting edge are pressed against the rake face and extend into the chip relief groove, causing significant local wear of the relief groove, and the chips remain pressed against the rake face and are not ejected until the next cutting. Cutting performance is hindered by doing so.
The cutting edge is damaged.

The present invention aims to solve these conventional drawbacks, and provides an end mill cutting method and device in which the generated chips are separated from the rake face and are effectively discharged, and local wear of the rake face and relief groove does not occur. It provides:

The first gist of the present invention is to use an end mill in which an injection hole formed in the axis of the body of the end mill is communicated with an injection hole opened in a chip relief groove, so that the injection hole is formed in a direction substantially parallel to the rake surface of the cutting blade. In addition, pressurized fluid is injected toward the cutting edge from between the chips that are being generated and the rake face to separate the chips from the rake face while cutting is performed.

The second gist of the present invention is to form a hole for fluid in the axis of the main body of an end mill, and to open this hole into a chip relief groove to serve as an injection port. It is formed so as to be substantially parallel to the cutting edge and in a direction substantially perpendicular to the cutting edge.

Hereinafter, the present invention will be explained with reference to drawings of embodiments. In Figs. 1 to 3, an injection hole 2 is formed in the axis of the end mill body 1, and a chip relief groove 7 is formed.
A pressurized fluid injection port 3 that communicates with the injection hole 2 is opened in the opening. The injection port 3 is formed so as to inject pressurized fluid toward the cutting edge 9 substantially parallel to the rake surface 5 of the chip 4. The cutting edge 9 is spirally formed from the center.

Cutting is performed by this end mill, and during cutting, compressed air or cutting fluid is sent through the injection hole 2 and sprayed from the injection port 3. By cutting the workpiece 8, chips 6 are generated as shown in FIG. The chips are discharged separately from the rake face 5 of the chip, and therefore do not attach to the rake face and get caught in the next cutting, and do not locally damage the relief face 7. It also has a cooling effect on the cutting edge. If this pressurized fluid is not sprayed, the tip of the chips extending along the rake face 5 will hit only a specific part of the relief groove, damaging and abrading that part. It is thought that this also increases the cutting resistance.

Note that as a method for ejecting chips, it is possible to blow compressed air onto the cutting part using a means other than the end mill, but in that case, it is necessary to spray compressed air accurately in the direction in which the chips 6 are separated from the rake face 5. However, it is difficult to do so, and it also requires a large amount of air to be injected, which has the disadvantage of deteriorating the working environment. However, in the case of the above method, compressed air is always injected almost parallel to the rake face, so chips can be efficiently discharged with a minimum amount of air, and the working environment will not be deteriorated. .

FIG. 5 shows an example in which the present invention is applied to another type of end mill, in which three injection ports 3 are formed on the rake face 7, from which pressurized fluid is blown onto the chips 6, and the chips 6 are It is made to be separated from the rake face 5.

The present invention can be applied to various other types of end mills, and the number, position, size, etc. of the injection ports may be appropriately selected depending on the size and shape of the end mill, the material of the workpiece, etc. .

As explained above, in end mill cutting, the present invention separates chips from the rake face by jetting pressurized fluid from the end mill, thereby preventing chips from welding to the cutting edge, This allows chips to be discharged smoothly and prevents damage to the relief surface.

[Brief explanation of the drawing]

Fig. 1 is a side view of an end mill that carries out the method of the present invention, Fig. 2 is its left side view, Fig. 3 is its bottom view, and Fig. 4 is an explanatory diagram of the state of cutting in the cross section taken along line - in Fig. 2. , FIG. 5 is a perspective view showing another embodiment. 1... End mill body, 2... Injection hole, 3... Injection port, 4... Chip, 5... Rake face, 6... Chips, 7...
relief groove.

Claims (1)

[Claims] 1. An injection hole formed in the axis of the end mill body,
An end mill that communicates with a nozzle opening in the chip relief groove applies pressure from the nozzle almost parallel to the rake surface of the cutting edge, and from between the chips that are being generated and the rake surface toward the cutting edge. An end mill cutting method characterized by performing cutting while jetting fluid to separate chips from the rake face. 2. A hole for fluid is formed in the axis of the body of the end mill, and this hole is opened into a chip relief groove to serve as an injection port, and this injection port is arranged so that the injection fluid is close to the rake face and is almost parallel to the cutting edge. An end mill cutting device characterized in that the end mill is formed so as to face in substantially orthogonal directions.