JPS6117785Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a throw-away compound gear cutter, which integrates a coarse gear cutter and a finishing gear cutter, and in particular, has two tips for the finishing gear cutter. It is divided.

[Conventional technology]

For finishing gear cutters, conventionally a brazed blade type or a full-form tip is generally used.
Examples of the latter include Publication of Utility Model Publication No. 52-21514 and Japanese Unexamined Patent Publication No.
There is one shown in Publication No. 56-39820. However, since all of these types of chips form a gear shape with a single chip, they have the disadvantage of ejecting large chips that follow the gear shape, and the cutting resistance is also large, making it difficult to use a slow-away chip. It has not been done.

Furthermore, in the past, rough gear cutting and finishing gear cutting were performed using separate cutters, which resulted in the problem of inefficient work processes.

The purpose of this invention is to provide a throw-away compound gear cutter that solves these problems.

[Means to solve problems]

In order to solve the above problems, this idea
A rough gear cutter and a finish gear cutter that cut the same gear are combined in the axial direction and integrated.
The cutting edge of the former cutter is composed of a full-form throw-away tip, and is installed at a constant angle of inclination in the axial direction so as to cut a tooth groove that is one gear pitch ahead of the cutting edge of the latter cutter. The cutting edge of the latter cutter is composed of a two-piece throwaway tip, and the two-piece throwaway tip has a shape in which the tooth space of the gear is divided into two in the tooth height direction, and each two-piece throwaway tip is The rake surfaces are alternately directed to opposite sides, and the cutting edges are alternately arranged so that when the cutter is rotated, the locus of the cutting edge forms a tooth groove.

[Effect]

A tooth groove advanced by one pitch is cut by a rough gear cutter, and then the tooth groove is cut by a finishing gear cutter.

A finishing tooth cutter performs finishing cutting of one tooth groove by combining a pair of split tips that are alternately shifted in the axial direction.

〔Example〕

The cutter of this invention, as shown in Figure 1,
a coarse gear cutter 1 that cuts the same gear A;
It consists of a combination of a finishing gear cutter 2, in which the finishing gear cutter 2 is fitted into the boss part 3 of the coarse gear cutting cutter 1, a key 4 is interposed between the two, and it is integrated with a bolt 5. be.

The coarse gear cutter 1 uses a full-form throw-away tip 6, and is designed to cut a tooth groove that is one pitch ahead of the finish gear cutter 2. and is inclined in the axial direction by θ (=360/Z, where Z is the number of teeth).

The means for attaching each of the chips 6 described above are conventionally known means.

The finish gear cutter 2 has a locator 8 fitted into recesses provided at regular intervals on the outer peripheral surface of the cutter body 7, and the locator 8 is inserted in the radial direction with a screw 9 and with another screw 10 (sixth (see figure) to fix in the circumferential direction. The chips 11, 11' are fitted on the front surface of the locator 8, and the chips 11, 11'
The tips 11, 11' are clamped to the locator 8 by fixing the presser foot 12 inserted into the front surface of the cutter body 7 with screws 13.

The chips 11, 11' are as shown in FIG.
The shape of the tooth groove of the gear is divided into two in the direction of tooth height, and as shown in Figure 7, two chips 11 and 11' are assembled with their inner sides slightly overlapped. In this case, the shape of one tooth groove of gear A is formed. That is, each chip 11, 11' is attached to a little more than half of the root a of the gear A, which is the workpiece material, and a surface b of the tooth root.
and a cutting blade 14 capable of cutting a curved surface spanning the surface c of the tooth tip.
is formed at the intersection line of the parallel front and rear surfaces and the rake surface 15, and the front and rear surfaces and the rake surface 1
The angle formed by 5 is 90 degrees, and it is formed into a so-called negative type.

The above chips 11, 11' are shown in FIGS. 1 and 2.
As shown in the figure, the direction of the cutting blade 14 is changed one by one, and the mounting position is shifted in the axial direction of the cutter body 7 within a range where the inner sides slightly overlap, so that the cutting edge of each chip 11, 11' is changed. The rotation loci of 14 are arranged so as to form a perfect tooth space shape as shown in FIG.

The mounting angle of the chips 11, 11' is such that the rake angle in the axial direction is 0 degrees and the rake angle in the radial direction is approximately -5 degrees or less. It is being formed.

The above gear cutter is coarse gear cutter 1.
Rough cutting is performed on the tooth groove one pitch ahead of the finishing gear cutter 2, and then finishing is performed with the finishing gear cutter 2.

〔effect〕

As described above, this invention is a combination of a rough gear cutter and a finishing gear cutter, and has the effect of increasing work efficiency since rough machining and finishing machining are performed simultaneously.

In addition, since the finishing gear cutter uses two-split tips, the cutting resistance applied to each tip is reduced, and the chips are thinner and easier to break up.
Since it is a split type and has low cost, it can be completely converted into a throw-away system.

[Brief explanation of the drawing]

Figure 1 is a sectional view, Figure 2 is a partially omitted front view, Figure 3 is a perspective view of the chip, Figures 4 to 6 are sectional views of the part where the chip is installed, and Figure 7 is the chip locus in the cutting state. FIG. 1...Rough gear cutter, 2...Finish gear cutter, 6...Complete throw-away tip, 7
...Cutter body, 11, 11'...Tip, 1
4... Cutting edge, 15... Rake face.

Claims (1)

[Scope of utility model registration request] A coarse gear cutter and a finish gear cutter that cut the same gear are combined and integrated in the axial direction, and the cutting edge of the former cutter is composed of a comprehensive throw-away tip, and the cutting edge of the latter cutter is configured to cut the gear. The latter cutter is installed at a constant inclination angle in the axial direction so as to cut the tooth groove advanced by one pitch, and the cutting edge of the latter cutter is composed of a two-piece throwaway tip. The tooth groove of the gear is divided into two in the direction of the tooth height, and when the rake face of each split throwaway tip is turned to the opposite side alternately and the cutter is rotated, the trajectory of the cutting edge is the same as the tooth height. A throw-away compound gear cutter that is arranged in alternating axial directions to form grooves.