JPS6138809A - Cutting method and device of roller gear cam - Google Patents

Abstract

PURPOSE:To prevent a cutter head from vibrating further form the whole device into a small size, by cutting cam material, positioned in a predetermined position outside a table and revolving on the own axis, by a cutter gradually changing its position while turning. CONSTITUTION:A cam material (a), being held between rotary supporting members 3, 3 is positioned in a predetermined position. The rotary supporting member 3 is slowly rotated by a servomotor 11, causing the material (a) to rotate. A cutting tool 10 advances with a cutting tool mounting rest 9, and the mounting rest 9 is driven and turned by a servomotor 12. Consequently, a cutter head 10a, drawing a locus of predetermined radius of curvature, is turned. Rotation of the material (a) on its own axia and turning angular speed ratio of the head 10a are numerically controlled so that a grooves cam of desired shape may be formed on a circumferential surface of the material (a).

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field and Prior Art) The present invention relates to a method and apparatus for cutting grooved cams on the circumferential surface of a roller gear cam.

The roller gear cam, shown in the lower part of FIG.
Due to this rotation, a plurality of rotating cam followers 4 on the circumferential surface of the follower roller 3 shown in the upper part of the figure are sequentially fitted into the groove cams 2 on the circumferential surface of the roller gear cam, and follow the rotation of the roller gear cam to follow the rotation of the roller gear cam. Since the joint roller 3 can be rotated intermittently and its operation is precise and reliable, it is suitable for use in an automatic assembly line, robot mechanism, etc.

As a method for cutting and forming the grooved cam of this roller gear cam, there is a well-known round control.

However, recently, cutting methods using servo mechanisms with simultaneous multi-axis numerical control have been widely used, and one known example is the cam cutting method using simultaneous two-axis control shown in Japanese Patent Publication No. 57-5646. There is a device.

In this known example, as shown in FIG. 2, two shafts of a cam blank tool 3 are extended onto a rotary table 1, a cutter head 4 is brought to a cutting location of a cam blank 2, and the cutter head 4 is fixed in position. The angular velocity ratio of the rotation of the cam material 1 around the axis A and the rotation of the rotary table 1 around the axis B is the biaxial component of the line that the groove cam should draw on the cam circumferential surface, that is, the cam circumferential surface. A two-axis simultaneous numerical control servo mechanism is used in which control values are component values in the direction of , and in the direction in which the camshaft runs.

(Disadvantages of the Prior Art and Objects of the Present Invention) By the way, in the known example, the cam material and the cutting tool fixing support mechanism are located on opposite sides of the central axis of the rotary table, and the cutting tool is not fixed. Since the support mechanism is located outside the rotary table, the cutting tool mechanism becomes long, and unless a special intermediate support mechanism is employed, the cutter head is likely to cause minute vibrations during cutting, making it difficult to increase the cutting speed. Not only the equipment as a whole /J\
It cannot be modeled. Furthermore, when cutting cams of various sizes with one device, it is difficult to install a position adjustment mechanism for the cam material fixing device on the rotary table.

The present invention solves the above-mentioned drawbacks of the prior art, shortens the length of the cutting tool device, downsizes the overall device, prevents minute vibrations of the cutter head during the cutting process, increases cutting speed, and is easy to operate. The object is to obtain a cutting method and a device capable of carrying out the same.

(Structure and operation of the present invention) The basic solution of the present invention to achieve the above object is as follows. In other words, in machine tools that generally use a rotary table or a moving table, the workpiece is positioned and fixed on the table, and when the table turns or moves and the workpiece reaches a predetermined position, the workpiece is positioned at that position. Machining is performed by bringing the tool into contact with the workpiece.

The above-mentioned known technology also follows the above-mentioned conventional technical means in that the cam material is placed on a rotary table and processed.

However, the present inventor noticed that the above-mentioned conventional means were not a good idea when cutting a roller gear cam, and by using the above-mentioned means, in the exact opposite way, the cam material positioned at a predetermined position outside the table was cut. We came up with a method of cutting using a cutter that gradually changes its position while rotating. A key feature of the present invention is that the workpiece is fixed and the cutter head pivots.

Therefore, the gist of the method of the present invention is to apply the above-mentioned concave arc surface to the circumferential concave arc surface of the cam material, which is positioned at a predetermined position by pressing both end surfaces so as to be rotatable. A rotary cutter head of a cutting tool that rotates in a plane including the axis of rotation of the cam material is brought into contact with the same radius of curvature as the radius of curvature of the arc surface, and the angular velocity ratio between the rotation of the cam material and the rotation of the cutting tool is determined. A method for cutting a roller gear cam, characterized in that the grooved cam is cut while being controlled by a numerically controlled servo mechanism so as to match a desired running pattern along the circumferential surface of the grooved cam to be cut on the circumferential surface of the cam material. be.

Further, the apparatus according to the present invention for carrying out the above method includes a fixed frame provided on the bed, a fixed frame provided on the bed, and a fixed frame capable of moving back and forth in the horizontal direction and fixing the position. A rotary support member installed on the center side of the cam material and capable of clamping and fixing the cam material from the cylindrical axis direction, and a servo motor A1 on the bed above to control the rotation of the rotary support member. A rotatable indexing head is installed facing away from the fixed frame, and a servo motor B controls the rotation of the indexing head.
1. A cutting tool installed on the indexing head so that it can move forward and backward.
It is equipped with a rotary cutter head at the tip of the cutting tool and a motor that rotationally drives the rotary cutter head, and has at least a mechanism for simultaneously numerically controlling the rotation of the cutting tool and the rotation of the rotary support member of the cam material using each of the above-mentioned servo motors. This is a grooved cam cutting device characterized by the following.

The operating principle of the above method and device will be explained with reference to FIG. 3. First, the cam blank 1 is attached to a fixing device 20 that can move back and forth in the left and right directions, and a rotating support member 3 that can rotate around an axis A. The fixing device 2 is advanced toward the center and fixed in place. Next, the cam cutting tool 5 supported on the indexing head 4 which can be rotated around the axis B so as to be movable back and forth is moved, and the cutter head 6 at the tip thereof is brought into contact with the circumferential surface of the cam blank 1. In order to form a cam groove of a predetermined shape on the circumferential surface of the cam material, cutting is performed under servo control so that the rotation of the cam material 1 and the rotation of the cutter head 6 maintain a desired angular velocity relationship. In addition, if necessary, the cam material 1 of the cutter head 6
The cam material fixing device 2 for advancing and retreating into contact with and separating from the cam material
A numerically controlled servo mechanism can also be used to move forward and backward.

(Embodiment) An embodiment of the method and apparatus of the present invention will be described with reference to FIG. 4.5.

FIG. 4 is a plan view of the device of the above embodiment, and FIG. 5 is a side view of the same.

In each of the above figures, 1 is a fixed frame installed on the bed 13, and 1a is a pair of left and right guide grooves provided on the upper surface of the fixed frame 1. A cross rail 2 is provided with protrusions 2a on both left and right sides of its lower part to fit into the guide grooves 1a of the fixed frame 10, and is supported so as to be movable back and forth with respect to the fixed frame 1. A rotation support member 3.3 that supports the cam material a is attached to the front surface of the cross rail 2, and the screw portions 3a, 3a protruding toward the cross rail 2 side are connected to the rotation nozzles provided on the cross rail 2. 6 is screwed into the rotating screw portion 4, making the rotary support member 3.3 movable up and down in FIG. A is a cam material to be cut, and the screw portion 2c of the cross rail 2 is rotated by operating a rotary handle 7 attached to the rear part of the screw portion 5, which is pivotally supported by a rotation support member 3.3 controlled by a servo motor 11. By moving it forward and backward, it is positioned and fixed at the cutting position, and the position is automatically displayed on the digital gauge 14.

8 is an indexing head that can be rotated 70 degrees left and right in the horizontal direction; 9
10 is a cutting tool fixed to the top surface of the indexing head 8, and the protrusion 9a running in the front-rear direction on the top surface of the cutting tool mount 9 is the cutting tool 10. It is fitted into the guide groove 10c of the base portion 10b, and can be moved forward and backward and fixed at a fixed position, and can also be rotated with the rotation of the indexing head 8. A cam follower 4 shown in FIG. 1 is attached to the tip of the cutting tool 10.
An end mill having the same shape as the one shown in FIG. 10d is a drive motor for the cutting tool; 11 is a servo motor that controls the rotation of the multi-rotation support member 3.3; and 12 is a servo motor that controls the rotation of the indexing head 8. Reference numeral 9b is a motor for moving the cutting tool mounting base 9 forward and backward, and in this embodiment, it is a servo motor.

This device is equipped with a well-known NC control board and an operation board (not shown).

To describe the operation of the device of this embodiment, the rotary handle 7 is operated to set the cross rail 2 to the backward position,
Operate the rotary handle 6 to open the interval between the rotary support members 3.3, fix the cam material a to one rotary support member 3, and operate the rotary knob 6 to increase the interval between the rotary support members 3.3. Narrow it down and firmly hold the cam material 3. Next, the rotating handle 7 is stopped.

After that, when the operating panel is operated to start, the cutting tool 10 is moved forward together with the cutting tool mounting base 9 by the servo motor 9b, and the cutter head 10a at the tip of the cutting tool is moved to the circumferential surface where the cam material is to be cut. The cutter head IOa positioned at the end and rotated in reverse by the drive motor 10d starts cutting the cam material a. Servo motor 11 during cutting
As the rotary support member 3 slowly rotates, the cam blank a rotates and continues cutting in the circumferential direction, but on the other hand, the cutting tool mount 9 rotates due to the drive of the servo motor 12. As a result, the cutter head 1.0a at the tip of the cutting tool 10 rotates along a locus with a predetermined radius of curvature. The rotation of this cam material a and the cutter head 10a
The angular velocity ratio of the rotation is numerically controlled so as to form a grooved cam in a desired shape on the circumferential surface of the cam blank a.

When the cutting process is completed, the rotation of the rotary support member 30 is stopped, the cutting tool 10 is moved backward as the cutting tool mount 9 is retreated by the operation of the servo motor 9b, and the cutting tool mount 9 is rotated by the operation of the servo motor 12. At the same time, the cutting tool 10 also returns to its original position, completing one complete process.

(Effects) The method and device of the present invention have the following effects:
11.12/'i servo motor; 13 is the bed; ■Since the cutting tool is installed on a rotating cutting tool mount, ■The distance between the support part of the cutting tool and the cutter head is short, and the cutter head is subject to slight vibrations such as J% during cutting, which requires precision. Necessary cutting accuracy can be ensured without requiring special consideration for prevention, and the overall device can be downsized. ■Since the cam material is fixed independently outside the rotary table, there is more leeway in adjusting the position of the cam material compared to when it is fixed on the rotary table.
It becomes extremely easy to process various large and small cams with one machine tool.

[Brief explanation of drawings]

Claims (2)

[Claims] (1) A plane containing the rotational axis of the cam material with the same radius of curvature as the radius of curvature of the concave arc surface on the circumferential concave arc surface of the cam material, which is positioned at a predetermined position by pinching both end surfaces so that it can rotate. A rotating cutter head of a cutting tool rotating inside the cam material is brought into contact with the rotary cutter head, and the angular velocity ratio between the rotation of the cam material and the rotation of the cutting tool is set to a desired value along the circumferential surface of the groove cam to be cut into the circumferential surface of the cam material. A method for cutting a roller gear cam characterized by cutting a grooved cam while controlling it by a numerically controlled servo mechanism so as to match a running pattern. (2) A fixed frame installed on the bed, a cross rail installed on the top surface of the fixed frame so that it can be moved forward and backward in the horizontal direction and fixed in position, and a cam material installed on the surface of the cross rail near the center of the bed from the direction of its central axis. A rotary support member that can be clamped and fixed, a servo motor A that controls the rotation of the rotary support member, a rotatable indexing head that is installed on the bed facing the fixed frame, a servo motor B that controls the rotation of the indexing head, and a rotary support member that controls the rotation of the rotation support member. It is equipped with a cutting tool that is movable back and forth on the cutting head, a rotating cutter head at the tip of the cutting tool, and a motor that rotationally drives the rotating cutter head. A roller gear cam cutting device characterized by having a mechanism for simultaneously numerically controlling the rotation of a rotation support member.