JPS5943049Y2 - T-slot milling cutter - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to groove machining, particularly to an improvement of a milling cutter for cutting grooves having an inverted T-shaped cross section.

Conventionally, this type of milling cutter, as shown by AIK in Figure 4,
The chips to be disposed are of a single shape, and when cutting a groove, each cutting edge was usually involved in cutting the entire surface of the groove to be cut.

However, in this case, there was a problem with waste evacuation, and the cutting load applied to the single blade was considerably greater than when cutting the outer surface, so it was not used much for cutting steel, and was mainly used for cutting sacred objects.

This invention was devised as a result of various experiments in view of the above-mentioned circumstances, and one cutting blade is involved in cutting the top and both ends of the groove, while the other cutting blade only cuts the middle part of the groove. - The cutting load applied to the knife is extremely reduced compared to conventional cutting, and by dispersing the cutting part, the force of the chips is divided, and the evacuation of the chips is improved. The object of the present invention is to provide a milling cutter for machining T-slots that enables steel cutting.

The present invention has a cutting blade at the tip of the handle, which has an appropriate shape such as a cylindrical or tapered shape, on a diameter line perpendicular to the axis of the handle, one of which cuts both end faces of the groove in the workpiece. The other is a T-groove milling cutter characterized by alternately disposing tips each having a cutting edge that cuts the central part of the wire groove.

Hereinafter, embodiments of the present invention will be described based on the drawings.

The figure shows one embodiment of the Tll milling cutter of the present invention. In the figure, 1 is the handle of the cigarette tool, 2 is the cutting edge on both ends made of cemented carbide, and 3 is the center made of cemented carbide. The cutting blades shown in FIG.

T11 of this idea! /J[[The fly 2 has a main body A consisting of a steel handle 1, neck 11, and tip attachment part 4, and in the center of the main body, cooling oil is introduced, one of which is connected to an oil source (not shown). An oil hole 12 is formed, and the other side has a branch pipe for supplying cooling oil to the front of each cutting blade.

Reference numeral 1 denotes a handle formed by selecting an arbitrary shape, such as a cylindrical or tapered shape, to match the tool attachment state of a machine tool (not shown), and a mounting part is provided at the tip of the neck 11, which has a smaller diameter than the handle. 4, the mounting part has a plurality of cutting blade mounting grooves 41, and this mounting groove 41 is a groove in which the cutting blade 2.301 part is buried. Let's do 42\
It is tilted.

With this configuration, the cutting blade 2,
When No. 3 is brazed, the holding force of the cutting edge becomes good.

A chip discharge passage 44 is provided in front of each cutting blade.

Each chip is fixed to the plurality of mounting grooves 41 in the mounting portion 4 of the main body A by means such as silver soldering or copper soldering.

After that, the cutting edges 2 on both end faces and the cutting edge 3 in the central part are formed by grinding.
are arranged alternately, and a SL which is slightly smaller than the cutting surface S of the cutting blade 3 is formed on the back side of the cutting blade 2, and this 81
Chamfers 21 with θ of 5 to 15 degrees are entirely formed at the upper and lower corners of the wafer.

In addition, the cutting edge 3 extends 45 degrees above and below the cutting surface S.
Cut 32, 32L, cutting action surface θ1 is 4 to 12 degrees,
Preferably, a chamfer 31 of 8° is provided.

The milling cutter configured as described above is used to cut a workpiece B as shown in Fig. 4, but the workpiece has a guide groove E provided in advance, and at this price, a wide groove C is used.
In this case, cutter blade 2 cuts this wide groove C.
Since the upper and lower surfaces are cut and the cutting edge 3 cuts the central part of the wide groove, the cutting load on each cutting edge is distributed to ~%, and the cutting load of this tool is Vibration and chatter can be prevented, and the ejected chips are generated with a width of 1 to 3 times smaller than before, making them easier to break up and allowing for better chip evacuation. This made it possible to cut steel, and in cutting cast metals, efficiency was improved by 4 to 5 times compared to conventional cutting.

In addition, by providing a chamfer 21 with θ of 5 to 15 degrees at the corner of the back of the cutting blade 2 and a chamfer 31 with 01 of 4 to 12 degrees on the back of the cutting blade 3, each chamfer
Cutting starts from the rising surface of the tool, and as the tool rotates, the cutting load is gradually applied to the cutting edge.This prevents chipping of the cutting edge during initial cutting, and significantly reduces cutting noise.

Also, the outer diameter D1 of the cutting blade 3 is smaller than the outer diameter of the cutting blade 2.
If the diameter is larger, a gap will be created between the part 81 of the cutting edge 2 and the workpiece, and the cutting load applied to each cutting edge can be equally distributed, and the cutting edge 2 receives the cutting load at both ends. The lifespan of the cutting edge 3 can be made comparable to that of the cutting edge 3.

As described above, the present invention makes it possible to cut steel by alternately arranging the cutting blades of the milling cutter for machining T-slots, one with a bent profile on both ends and the other with a central part.
In addition to being able to extend the life of the KB by 4 to 5 times compared to the conventional results, it also has the effect of reducing cutting noise.

[Brief explanation of the drawing]

Figure 1 is a partially sectional front view of the milling cutter of the present invention;
3 and 3 are enlarged bottom views, and FIG. 4 is a schematic perspective view showing the state of use, with a portion cut away. 1...Handle part, 2...Both end face cutting blade,
3... Cutting blade in the central part, 4... Cutting blade attachment part, 11... Neck, 12... Oil hole, 21...・・Chamfa-131・・・・・
Chamfer-1θ2... Curved angle, A... Milling cutter body.

Claims (1)

[Scope of utility model registration request] At the tip of the handle, which has an appropriate shape such as cylindrical or tapered,
On the diameter line perpendicular to the axis of the handle, one has a cutting edge that cuts both end surfaces of the groove of the workpiece, and the other has a cutting edge that cuts the center of the line groove. A T-slot milling cutter characterized by having each tip arranged alternately.