JPH01109022A - Gear shaving machine - Google Patents

Abstract

PURPOSE:To save rearranging time and to simplify the structure of driving mechanism by supporting a plurality of shaving cutters rotatably on every cutter shaft and carrying out shaving through rotation from work side. CONSTITUTION:When a work W supported on left and right tailstocks is machined, an index drive shaft 11 and a turret 12 are indexed and rotated through an index drive means 14 so as to arrange a shaving cutter C immediately above the work W. Then the turret 12 is turned by predetermined angle around the vertical axis Y together with a turning section 4b through a turn drive means 10 corresponding to torsional angle of the work W, so as to set a necessary cross angle. Then a lifting/lowering section 4a is lowered with the work W being rotary driven through a work drive motor 15, and the cutter C is fed together with the turning section 4b so as to carry out shaving. Consequently, the shaving cutter C geared with the work W is rotary driven from the work W side and required tooth face finish is made on the work W.

Description

Detailed Description of the Invention This invention is a gear shaving machine that finishes the tooth surface of a workpiece supported by left and right valve stands on a table using a shaving cutter equipped with a cutter head. Regarding.・Conventional technology A plurality of shaving cutters are supported by a turret that is rotatably equipped on the cutter head, and the shaving cutter selected for one shaving cutter is used for gear finishing processing by indexing rotation of the turret. A compressed gear shaving machine is known from Japanese Patent Publication No. 61-34929. .

In this conventional example, a plurality of shaving cutters are supported by a turret in a radial arrangement in which their axes lie on one conical surface and are opposite to the generatrix. It is rotatably supported around a line.

Conventionally, the rotational drive during machining is dependent on the drive of the shaving cutter.

According to the above-mentioned conventional example, the axis of the turret is obliquely intersecting the axis of the cutter head, which is rotated to set the intersection angle according to the torsion angle of the workpiece and feeds the cut. The axis of each shaving cutter is oblique to the axis of the turret.

When the turret indexing drive mechanism and the shaving cutter rotation drive mechanism are provided, each with a bevel gear mechanism in such a relationship that their axes intersect obliquely or intersect, the entire cutter head side becomes It is recognized that the structure of the drive mechanism is extremely complicated, and in particular, a large cost is required for a rotation drive mechanism for a plurality of cutters whose respective axes extend in different directions.

Therefore, this invention provides a turret that is equipped with a plurality of shaving cutters, and extremely simplifies the structure of the drive mechanism so as to greatly reduce the time required for 9 setup changes during gear shaving processing. , aims to provide a new gear shaving machine.

Technical Means for Solving the Problems Therefore, as illustrated in the attached drawings, the present invention is designed to move the cutter head 4 up and down together with the lifting section 4a by means of a turning drive means 10 provided on the lifting section 4a. The rotating part 4b, which is rotated by the swivel section 4b, is equipped with an indexing drive shaft 11 that can be rotated around a horizontal axis, and each turret 12, which is installed on the indexing drive shaft 11, is fixedly equipped with a shaving cutter C. A plurality of horizontal cutter support shafts 13 are disposed intermittently in the circumferential direction and rotatably supported, and an indexing drive means 14 for indexing and rotating the indexing drive shaft 11 is provided in the rotating portion 4b, A workpiece drive motor 15 was provided on one tailstock 5 of the workpiece.

Function: Prior to machining the workpiece W supported by the left and right tailstocks 5.6, the indexing drive shaft 11 and turret 12 are indexed and rotated by the indexing drive means 14 to be used for machining. Bring the shaving cutter C to a position directly above the workpiece W. Next, according to the torsion angle of the workpiece W, the turning drive means 10
The turret 12 together with the rotating portion 4b is rotated by a predetermined angle around the vertical axis Y to set a necessary crossing angle.

Then, while rotating the workpiece W by the workpiece drive motor 15, the elevating section 4a is lowered to obtain a cutting feed of the cutter C used for each rotating section 4b, and shaving is performed in accordance with a conventional method. The shearing cutter C meshed with the workpiece W is rotated by driving from the workpiece W side, and finishes the required tooth surface of the workpiece W.

In FIG. 1.2 showing the entire example machine, 1 is a bed, and 2 is a column erected integrally on the bed 1. bed 1
The table 3 provided above.

It is said to have 9 horizontal feed functions and a swing function for crowning processing.

The elevating portion 4a of the cutter head 4 is supported by a rail 7 on the end surface of the column 2 so as to be able to rise and fall, and a feed screw 9 is driven by an elevating drive motor 8 provided on the head overhang portion 2a of the column 2.
It can be raised and lowered through.

As shown in FIG. 1, the rotating portion 4b of the cutter head 4 has a pinion 18 fixedly mounted within the elevating portion 4a on a support cylinder portion 17 protruding from its upper surface, and the rotating driving means is a hydraulic cylinder. A rack 19 fixed to the piston rod 10 is engaged with the pinion 18, and can be driven to rotate around the vertical axis Y rotation. This swing drive mechanism is similar to that disclosed in Japanese Utility Model Application No. 60-71523.]
Further, the cutter head 4 is also provided with a position detection mechanism 20 for cutting control disclosed in the same publication.

As clearly shown in FIG. 3, the cutter head rotating portion 4b has a support frame 21 fixed to one end of the main body portion forming an inverted character shape, and has a substantially gate-like shape when viewed from the front. The indexing drive shaft 11 has both ends attached to both portal-shaped legs, and a bearing mechanism 22.
It is rotatably supported via 23.

As shown in FIG. 3, the circular turret 12 is fitted onto the indexing drive shaft 11 with its center boss 12a, and is inserted through the flange 11a of the indexing drive shaft 11. It is fixed to the drive shaft 11 by a screwed-back bolt 24. This turret 12 is provided with four bearing holes 25 arranged at 90 degree intervals in the circumferential direction, and the power heel support shaft 13 is inserted into each of the support holes 25 so that the inner peripheral surface of the support hole 250 and the cutter support shaft 13 are connected to each other. The cutter support shaft 13 is rotatably supported by a rotary bearing mechanism.

The cutter support shaft 13 is a portion that projects outside the turret 12, and a shaving cutter C is fixedly equipped with a key 26 fitted therein. The cutter C is held between a ring 27 and another ring 28, which are placed against the flange 13aK of the support shaft 13.
The position in the axial direction is fixed by a presser foot 29 screwed onto -91111 of No. 3 through a presser metal fitting 30 and a presser foot 31. Therefore, by once removing the holding bolt 29, the cutter C can be easily replaced. Cutter spindle 13
A retainer nut 32 is screwed onto the other end.

Similarly, as shown in FIG. 3, the index drive means 14 is constituted by an electric motor, and is installed on the outer surface of the cover plate 2V on the side outer surface of the support frame 21.

A horizontal intermediate shaft 34 is provided in the gear box-shaped support frame 21, and the small diameter end 11b of the indexing drive shaft 11 is also connected to the support frame 21.
It protrudes inward. Gears 35, 36, and 37 are fixedly installed on the motor shaft 14a, the intermediate shaft 34, and the drive shaft small diameter end 11b of the indexing drive means 14, respectively, and these gears index the rotation of the motor shaft 14a and drive the drive shaft 11. A reduction gear train is configured to transmit the Lid plate 21a
A rotary encoder 38 is installed on the outer surface, and the intermediate shaft 34 is connected to the encoder shaft 38a by a coupling 39, so that the rotation angle of the intermediate shaft 340 is determined by the rotary encoder 3.
8 to detect the index drive shaft 11 and the turret 1.
The purpose is to detect the rotational phase of 2.

On the opposite side of the support frame 21, the indexing drive shaft 11 is not supported by the main body of the rotating part 4b, but is supported by a cylindrical frame 41 fixed to the main body, but is fixed to the turret 12 and the cylindrical frame 41, respectively. The ring-shaped positioning clamp plates 42 and 43
They are provided facing each other as shown in the figure. The above-mentioned turret boss portion 12 is located on the outer circumference of the indexing drive shaft 11.
A, a cylindrical piston 45 whose position on the indexing drive shaft 11 is fixed by the bearing mechanism 22 and the nut 44 on the end of the drive shaft 11 is fitted into the hole of the cylindrical frame 41. It is a provision. Cover members 46 and 47 fixed to the cylindrical frame 41 are oil-tightly inserted between one end and the other end of the piston 45, and the large diameter portion 45a of the inner shaft of the piston 45 is connected to one end and the other end. Hydraulic chambers 49 and 50 are formed in the double-acting hydraulic cylinder 51. A hydraulic chamber 49 is provided within the cylindrical frame 41.
．． A hydraulic supply and discharge path for the oil chamber 5 is formed.
By supplying hydraulic pressure to the oil chamber 49, the piston 45 is displaced and the indexing drive shaft 11 and the tower 12 are moved to the right in the figure rJrIa, and after that, by supplying hydraulic pressure to the oil chamber 49, the piston 45 is displaced and indexed. The shaft 11 and the turret 12 can each be displaced by a certain amount in the left-hand direction in FIG. Both positioning clamp plates 42 and 43 are formed with clamp claws having tapered surfaces that can be held together, and by displacement of the drive shaft 11 and turret 12 in the third proper direction, maintenance between the clamp claws is achieved. The engagement is released and the engagement between the claws is achieved by displacement toward the left hand.

As described above, the indexing drive shaft ll by the indexing drive means 14
A positioning clamp mechanism is configured to correctly position and clamp the turret 12 after the index rotation of the turret 12), and the positioning clamp plate 42.43
The indexing drive means 14 performs indexing rotation by a predetermined amount with the clamp jaws released, and when the encoder 38 detects the predetermined amount, the indexing rotation is automatically stopped and hydraulic pressure is applied. Switch the circuit and position the clamp plate 4
W for 2! , is similar in that the turret 12 is correctly positioned and clamped in the direction of rotational displacement by displacing the clamp claws of both positioning clamp plates 42 and 43 to the left in FIG. Cutter head turning section 4b
A sensor 52 is provided for confirming the positioning clamp by the displacement of one cutter spindle 13 during the positioning clamp.

The gear 37 has a wide width so as to maintain meshing with the gear 36 on the intermediate shaft 34 even if the index drive shaft 11 is slightly slid.

The workpiece drive motor 15, as shown in Fig. WfJ1,
The tailstock center 5a of the tailstock stand 5 via the reduction gear box 54
It is supposed to be driven in rotation. 6 of the other tailstock 6
The push center 5a is moved forward and backward by a hydraulic cylinder 55 to support and release the workpiece W.

The main functions of the illustrated gear shaving machine are those described above as functions of the invention. When changing the setup, under control using an NC device or the like, the indexing drive hand R14 performs the indexing rotation drive until a predetermined amount of index rotation is detected (by the rotary encoder 38), and then immediately turns on the hydraulic pressure. The turret 12 is positioned and clamped by the operation of the cylinder 51.

When the sensor 52 confirms this, the swing drive means 10 is immediately activated to set the crossing angle. During this time, the workpiece W is supplied and supported between the tailstocks 5 and 6 by a loader mechanism (not shown), and upon confirmation of the crossing angle setting, the lifting drive motor 8 and the workpiece drive motor 15 are started, and the workpiece W is set in advance. A shaving cycle is executed.

Effects of the Invention In the present invention, the cutter head rotating section 4b, which is equipped to index and rotate the turret 12, is raised and lowered together with the cutter head elevating section 4a, and is also horizontally pivoted around the vertical axis Y to set the intersection angle. The turret 12 is equipped on the rotating part 4b so as to be rotatable around the horizontal axis X together with the indexing drive shaft 11.
The indexing drive shaft 11 is driven by the indexing drive means 14 provided at b.
Since the turret 12 is indexed and rotated through the indexing mechanism, the indexing drive mechanism can be easily constructed by connecting the indexing drive means 14 and the indexing drive shaft 11 with a spur gear mechanism. In addition, a plurality of shaving cutters C are rotatably supported by the turret 12 along with cutter spindles 13 to which they are fixedly mounted, and rotation from the workpiece side is performed by the workpiece drive motor 15 provided on the tailstock 5. Since we adopted a drive system that performs shaving processing by driving, the cutter spindle 13
Not only is each shaving cutter C stably supported by each rotatable support, but the structure of the rotary drive mechanism for processing is extremely simple, and the cutter drive mechanism is eliminated from the cutter head 4. As a result, the degree of freedom in designing the cutter head is increased, and four or more shaving cutters can be installed on the turret 4 in an arrangement that does not cause interference with jigs or workpieces.

[Brief explanation of the drawing]

FIG. 1 is a partially omitted front view of an embodiment of the present invention. FIG. 2 is a partially omitted side view of the same embodiment, and FIG. 3 is a longitudinal sectional front view of the main parts of the same embodiment. 1...bed, 2...column, 3...(-knee, 4
...Cutter head, 4a... Lifting part, 4b... Swivel part, 5°6... Tailstock, 8... Lifting drive motor,
10... Turning drive means, 11... Indexing drive shaft, 1
2...Turret, 13...Cutter spindle, 14...
Indexing drive means, 15... Workpiece drive motor, 18.
...Pinion, 19...Rack, 24...Bolt,
25...Support hole, 34...Intermediate shaft, 35.36.3
7...Gear, 42.43...Positioning clamp plate,
45...Piston, 51...Hydraulic cylinder, 54...
...Reduction gear box, 55...Hydraulic cylinder F, C.
...Shaving cutter, W...Work.

Claims (1)

[Claims] In the cutter head 4, the horizontal axis
A plurality of horizontal cutter spindles 13, each of which is fixedly equipped with a shaving cutter C, are attached to a turret 12 fixedly installed on the indexing drive shaft 11 in the circumferential direction. An index drive means 14 for indexing and rotating the index drive shaft 11 is provided in the rotating section 4b, and a work drive motor 15 is mounted on one tailstock 5 on the table 3. A gear shaving machine equipped with