JPH0128980Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention has a pair of blades in the axial direction at both ends of a gear to be machined which is formed by cutting into gears, and which has approximately the same shape as the teeth of the gear. This invention relates to a cutter for a phrasing machine that chamfers both left and right ends of a gear to be machined by meshing one cutter and rotating the two.

(Conventional technology) Conventionally, the structure was as shown in FIG.

That is, a cutter is formed in the shape of a large diameter and thin disk and has a tooth-shaped fixed blade d and a movable blade e on the outer periphery on the left and right side walls of a supporting disk body a formed in the shape of a small diameter and thick disk. Plates b and c are arranged coaxially.

Then, the left cutter plate b is integrally fixed to the support disc body a at four locations in the circumferential direction by fixing bolts f inserted from the right side wall of the support disc body a,
The cutter plate c on the right side is fixed in the circumferential direction 4 by a bolt g inserted from the right side wall of the cutter plate c.
The bolt hole h through which the bolt g of the cutter plate c is inserted is formed into an elongated arc shape centered on the axis of the cutter plate c. tar plate c
can be rotated and adjusted relative to the support disc body a.

A cylindrical bush j is passed through the axis of each of the support discs a and cutter plates b and c from the left cutter plate b side, and a flange k is formed at the left end protrusion of this bush j. and the supporting disc body a are inserted through the connecting bolt m from the flange k side.
It had a structure in which it was fixed integrally.

In addition, in FIG. 4, n is a keyway formed in the shaft hole of the bush j.

(Problems to be Solved by the Invention) The conventional device described above has the disadvantage that the number of parts increases, the number of processing and assembly steps increases, and it becomes expensive.

Furthermore, since a large number of parts such as the support disc body a and each cutter plate b, c and bush j are fastened from the axial direction, the flange k or the head of the bolt g may protrude in the axial direction. In particular, when a large number of cutters are arranged in parallel on the same axis to simultaneously perform phrasing on a large number of gears to be machined, each cutter should be arranged close to each other in the axial direction so as to correspond to the gear spacing of the gears to be machined. There were drawbacks such as difficulty in

The present invention was developed in response to the above-mentioned circumstances, and aims to provide a cutter that is inexpensive and can reduce the space in the axial direction by reducing the number of parts and eliminating any member that protrudes in the axial direction beyond the cutter blade. purpose.

(Means for solving the problems) In order to achieve the above object, the present invention is constructed as follows.

That is, a thick disk-shaped cutter body is provided, and this cutter body has an axial hole formed in its axial center,
A fixed blade formed on the outer periphery of one end in the axial direction has a larger diameter than the other part and has a tooth shape, a boss part on the other end in the axial direction has a ring shape and a smaller diameter than the other part, and a radially outer part of the boss part. The body part located on the opposite side has a bolt insertion hole formed in a step-like manner with a large diameter on the opposite side of the boss, passing through it in the axial direction and being narrow in the circumferential direction. A cutter plate having a movable blade of the same diameter and tooth type as the fixed blade is fitted, and this cutter plate is connected to the cutter body for rotation adjustment by bolts inserted into bolt insertion holes. It is.

(Function) With the above configuration of the present invention, the fixed blade is integrated with the cutter body, and there is no need for a bolt to fasten the two together.

Furthermore, the shaft hole of the cutter body can be directly supported by the rotating shaft, and the bush can be omitted.

Furthermore, the head of the bolt that fastens the cutter plate to the cutter body can be fitted and accommodated in the large diameter part of the bolt insertion hole formed in the cutter body, so that the head of the bolt can be axially removed from the cutter body. It no longer sticks out to the side.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

In the drawings, FIG. 1 is a sectional view of a cutter according to the present invention, FIG. 2 is a side view thereof, and third is a sectional front view of a main part of a phrasing machine to which the present invention is applied.

First, in FIG. 3, reference numeral 1 denotes a bed. A base 2 is placed on the front part of the bed 1, and a pair of left and right head stocks 3, 4 are placed on the upper surface of the base 2 so as to face each other.

Reference numerals 5 and 6 indicate tailstock shafts provided in the head stocks 3 and 4, which are operated in the left-right direction by hydraulic pressure.
It has a conical center which rotatably supports the gear 37 to be machined at both opposing axes.

A column 7 is fixed upright on the rear left side of the bed 1, and a movable frame 8 is attached to the upper front surface of the column 7 so as to be movable up and down via a Z-axis relay.

A bracket 9 protruding rightward is mounted and fixed on the upper surface of this movable frame 8. A geared motor 11 is mounted and fixed on the left side of the upper surface of the bracket 9 via a motor base 10 so as to be able to move up and down, and a sleeve bracket 1 is mounted on the right side of the lower surface of the bracket 9.
2 is suspended and fixed so that it can be slid in the left and right directions.

A spindle 13 is attached to the movable frame 8, and the spindle 13 and the geared motor 11 are connected via pulleys 17, 18 and a V-belt 19. Further, a sleeve 15 is rotatably attached to the sleeve bracket 12 coaxially with the spindle 13.

The cutter arbor 20 is supported across the shaft between the spindle 13 and the sleeve 15.

A small-diameter first cutter 27 is fitted and fixed on the left side of the cutter arbor 20 via the key 26, and a cylindrical cutter holder 29 is fitted on the right side of the cutter arbor 20 via the key 26. is fixed, and a large-diameter second cutter 28 is rotatably fitted into this cutter holder 29 via a pair of left and right needle bearings 30 with thrust bearings.

In FIG. 3, 31 and 32 are collars that adjust the spacing, or pitch, between the first and second cutters 27 and 28, 33 is a spacer, and 34 is a first ,
A nut that holds the second cutters 27 and 28, 35
is a holder fixed to the right end of the cutter arbor 20, and the right end of the cutter arbor 20 is tapered fitted to the left end of the sleeve 15 via this holder 35.

Further, 37 is a processed gear rotatably supported by the tailstock shafts 5 and 6, which in this example is a counter gear, and integrally includes a large-diameter hercal gear 37a on the left and a small-diameter hercal gear 37b on the right. .

The fixed blade 27b of the first cutter 27
The movable blade 27c is engaged with the right end and the left end of the large-diameter helical gear 37a of the gear 37 to be processed.

Further, the fixed blade 28b and the movable blade 28c of the second cutter 28 are made to mesh with the right end and the left end of the small diameter helical gear 37b of the gear to be processed 37.

Here, the first cutter 27 and the second
The cutter 28 is a feature of the present invention, and both have substantially the same structure.

Hereinafter, the first cutter 27 will be explained with reference to FIGS. 1 to 3 as a representative example.

Reference numeral 27a denotes a cutter body formed in the shape of a thick disk.This cutter body 27a has a shaft hole 27d and a keyway 27e formed in its axial center, and its right end outer periphery is flanged to a large diameter. A fixed blade 27b having a tooth shape corresponding to the teeth of the large-diameter helical gear 37a described above is formed around the entire circumference of the portion.

In addition, a small-diameter, annular boss portion 27f is formed by notching the outer periphery of the left end of the cutter body 27a, and a bolt insertion hole 27g is axially inserted into the body of the cutter body 27a located radially outward of the boss portion 27f. to form a through hole.

Four bolt insertion holes 27g are formed in the circumferential direction. Each bolt insertion hole 27g is formed elongated in the circumferential direction centering on the axis of the cutter body 27a, and the bolt 27m is provided at the right end of the hole 27g.
A large-diameter, ie, wide, accommodation chamber 27h is formed in which the head 27n of the head 27n is accommodated.

Next, 27j is a large-diameter cutter plate formed of a thin disc body, and a boss hole formed at its axial center is connected to the boss portion 27f of the cutter body 27a.
is rotatably fitted to the

The cutter plate 27j has a movable blade 27c having the same diameter and the same tooth shape as the fixed blade 27b around its entire outer periphery.

Then, screw holes 27k are inserted into four circumferential locations of the body of the cutter plate 27j, and the screw holes 27k are inserted into the bolt insertion holes 27g.
on the coaxial line.

27m is a bolt that fastens the cutter plate 27j to the cutter body 27a, and its head 27
n is accommodated in the accommodation chamber 27h of the bolt insertion hole 27g.

Next, the operation mode of the above embodiment will be explained.

First, when the geared motor 11 is started, the spindle 13 rotates via the drive pulley 17, V-belt 19, and driven pulley 18. The rotation of the spindle 13 causes the cutter arbor 20 to rotate, and the first cutter 27 fixedly supported by the cutter arbor 20 via a key 26 to rotate.

When the first cutter 27 rotates, the rotational moment is transmitted to the large-diameter hercal gear 37a via the fixed blade 27b and the movable blade 27c, and the to-be-processed gear 37 and hence the small-diameter hercal gear 37b are rotated.

The rotational moment transmitted to the small-diameter helical gear 37b is transmitted to the fixed blade 2 that is meshed with the small-diameter helical gear 37b.
8b and the second cutter 2 via the movable blade 28c.
8, and the second cutter 28 is rotatably supported by the cutter holder 29 via a needle bearing 30 with a thrust bearing. It will be rotated.

As a result, both the first cutter 27 and the second cutter 28 rotate while meshing with the large-diameter hercal gear 37a and the small-diameter hercal gear 37b,
Each helcal gear will be phrased at the same time.

(Effects of the Invention) As is clear from the above description, according to the present invention, the fixed blade is integrated with the cutter body, and the cutter body can be directly supported on the rotating shaft through its shaft hole.

Therefore, there is no need for separate parts such as bolts that fasten the fixed blade and the cutter body or bushings between the cutter and the rotating shaft, resulting in a reduction in the number of parts and lower costs.

Further, the heads of the bolts that fasten the cutter plate to the cutter body are accommodated in the housing chambers of the bolt insertion holes formed on the cutter body side, so that the heads do not protrude outward in the axial direction from the cutter body.

For this reason, together with the omission of the bush between the cutter and the rotating shaft, there is no member protruding outward in the axial direction from the cutter body, and the space in the axial direction can be reduced, especially when processing gears with multiple stages. Ideal as a cutter when simultaneously performing phrasing processing.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a cutter according to the present invention;
FIG. 2 is a side view thereof, FIG. 3 is a sectional front view of a main part of a phrasing machine to which the present invention is applied, and FIG. 4 is a sectional view showing a conventional cutter. 27: first cutter, 27a: cutter body,
27b: Fixed blade, 27c: Movable blade, 27d: Shaft hole, 27e: Keyway, 27f: Boss portion, 27g:
Bolt insertion hole, 27h: Accommodation chamber, 27j: Cutter plate, 27k: Screw hole, 27m: Bolt,
27n: Head.

Claims (1)

[Scope of utility model registration request] A cutter body in the form of a thick disc is provided, and the cutter body has a shaft hole formed in the shaft center thereof, and a fixed blade formed in the outer periphery of one end in the axial direction in a tooth shape and having a larger diameter than the other part. At the other end in the axial direction, there is a boss part formed in an annular shape with a smaller diameter than the other parts, and in the body part located radially outward of this boss part, the side opposite to the boss has a step-like large diameter and penetrates in the axial direction. and a bolt insertion hole formed elongated in the circumferential direction, and a cutter plate having a movable blade having the same diameter and the same tooth shape as the fixed blade is fitted into the boss portion around the entire outer circumference, A cutter for a phrasing machine, characterized in that a cutter plate is rotatably connected to a cutter body by a bolt inserted into a bolt insertion hole.