JPS58149158A - Generation machining device of rotary two lobe hyperboloid - Google Patents

Abstract

PURPOSE:To prevent the generation of residual cutting even if a cutting point is placed in the rotary center part of a work, by rotating a tool around the axial line at an angle with the axial line of the rotating work and controlling to relatively move the tool and the work in the both axial direction while generating a two lobe hyperboloid. CONSTITUTION:A tool 20 is protrusively provided eccentrically to one end of a rotary main spindle 22 having a rotary axial line U titled for a rotary axial line T of a work W, and the work W and the tool 20 are relatively moved respectivly in the direction of said both lines T (B-axis) and U (A-axis) while a rotary two lobe hyperbolid is cut and formed to the work W. Said relative movement is controlled by an NC device in accordance with the following formula. Assuming an angle theta formed by the line U of the spindle 22 and the line T of the work W for sintheta=b<2>d/2a (d; rotary diameter of tool) and X, Z for respectively a moving distance in each axial direction, the relation is Z= b<2> (a+X)<2>/(a<2>+b<2>)-1 - d<2>/4 <1/2>.

Description

[Detailed Description of the Invention] The present invention relates to a device for generating and machining a rotational square hyperboloid surface, and its purpose is to avoid leaving cutting residue on the workpiece generation surface, especially at the center of rotation of the workpiece, while the tool cutting edge is in circular motion. The purpose is to generate and process a high-precision rotational square hyperboloid.

Conventionally, in order to create a rotation square hyperboloid surface and its spherical surface, a workpiece W is attached to the end face of a spindle 2 and a spindle device 1 for rotating it at high speed is movable in the axis direction of the spindle, as shown in FIG. At the same time, the tool 3 is fixed on a slide table 4 that can move in a direction orthogonal to the ↓ axis, and the slide table 4 and the spindle device L are controlled to feed by numerical control while the workpiece W is rotating at high speed. There is a device that creates a hyperboloid of rotation by making the cutting edge draw a predetermined hyperbola.6 In such conventional devices, the rotational speed of the workpiece at the cutting point of the cutting tool is the cutting speed, so the cutting speed at the center of rotation of the workpiece is Since the speed is close to zero, cutting cannot be performed, which has the disadvantage of leaving uncut parts.

In order to eliminate such conventional drawbacks, the present invention attempts to create a rotational square hyperboloid by rotating the tool side, to avoid leaving uncut parts at the center of rotation of the workpiece, and to use a constant tool It is an object of the present invention to provide a highly versatile processing device that is equipped with an adjustment element that can create a rotation square hyperboloid of all specifications for the radius of rotation.

The principle of creating a rotation square hyperboloid according to the present invention will be explained.

Generally, when a rotation square hyperboloid is expressed in an xyz coordinate system, the axis of rotational symmetry is the X axis. This curved surface is an envelope surface of an inscribed sphere centered on a point on the X-axis. Therefore, as shown in Figure 2, the tool side passes through the OC and is tilted by θ with the X axis as the rotation axis.
If the rotary tool radius PQC'' is rotated and the workpiece side is rotated once around the X axis, part of the inscribed sphere OC Q Q/ s s /
is created. When part of this spherical surface includes MM', the hyperboloid MM' is cut.

If the position of OC is moved along the X-axis to the center position of the sphere in contact with vertex T (see FIG. 3) and the length of OcP is changed at the same time, a rotational square hyperboloid MTIφ' is created.

In order for the circle (x+a-)-X)2-1-y2=R2 to be tangent, it satisfies x ``''-a, y = O, so Q at this time is made to coincide with point T, so again this ( 2) If 2 and X are controlled using the relationship shown in equation 2, a rotation square hyperboloid can be created.

An example of a processing device to which such a creation principle is applied is shown in FIGS. 4 and 5.

10 is a bed, and on this bed 10 is a tool support stand 11.
A work support stand 12 is provided. Tool support stand 11
is a rotating main shaft 22 equipped with a face plate 21 that supports a tool 20;
A tool main spindle 23 rotatably supported on a shaft, a slide table 24 and a guide base 25 for sliding the main spindle 23 in a direction parallel to the spindle axis U, and a guide base 25 on which the guide base 25 is placed. It is composed of a swivel base 26 and a swivel support base 27 that can be rotated around an axis (■) perpendicular to the spindle axis U.A spindle drive motor 28 is mounted on the headstock 23.
It is rotatably connected to the rotating main shaft 22 via pulleys 23a, 28a and a belt 29.

The face plate 21 is provided with a tool 20 made of a diamond cutting tool that projects in the axial direction eccentrically with respect to the center of rotation, and the cutting edge 20a of the tool makes a circular motion with a rotational diameter d. still,
The tool 20 is not limited to a single-point cutting tool, but a milling cutter or a grindstone can also be used. The rotating support base 27 has an adjustment handle 27a.
This handle 2-7a is connected to a swivel base 26 via a worm gear (not shown), and the handle 2-7a is connected to a swivel base 26 via a worm gear (not shown). By turning a, the turning angle θ of the turning table 26 can be adjusted. The guide base 25 placed on the swivel table 26 is provided with a servo motor SMa connected to the sliding table 24 on which the headstock 23 is placed via a feed screw (not shown). Control amount 2.

The workpiece support device 12 includes a rotating main shaft 3 that supports the workpiece W.
0 rotatably supported on a shaft, a movable base 32 and a slide base 33 for sliding this work head 31 in a direction parallel to the spindle axis T, and a slide base 33 that is perpendicular to the spindle axis T. It is comprised of a guide base 34 that provides sliding guidance in the direction. The work head 31 is provided with a spindle drive motor 35, which is connected to one end of the rotating spindle 30 via a speed reduction mechanism. Rotating main shaft 3
A face plate 30a is provided at the other end of 0, and a workpiece W is concentrically fixed to this face plate 30a. The guide base 34 is provided with an adjustment handle 34a, and a feed screw (not shown) that is threadedly engaged with the slide base 33 is connected to the handle 34a. By turning this handle 34a, the work head 31 is moved in a direction perpendicular to the axis, and the work head 31 is set in a positional relationship such that the cutting point of the tool 20 passes over the work rotation center iT, as shown in FIG. can do. The slide base 33 is provided with a servo motor SMb connected to a feed screw (not shown) that is screwed into the slide base 32 and controls the entire movement of the work head 31 in the work axis direction.

40 is a numerical control device, which controls the servo motors SMa and SM.
b is controlled to maintain the relationship expressed by equation (2) above. Here, as shown in FIG. 5, the angle θ formed by the tool rotation axis U and the workpiece rotation axis T is kept constant, and two dimensions relative to the intersection Oc of both axes are controlled by the servo motor SMa. That is, the intersection Oc is an immovable point if the angle θ is constant; if the headstock 23 is fed forward along the tool rotation axis U, a increases, and if it is sent backward, ZI/'i decreases. Also, the X dimension with respect to the intersection oc is the servo motor SM
Controlled by The angle O formed by the above equation (1) is adjusted when changing the dimensions a and b of the rotation square hyperboloid, and when this angle O is changed, the tool cutting edge is aligned with the workpiece rotation axis T. The work head 31 is moved in the direction perpendicular to the axis of rotation of the work by the handle 34a.
Adjustment is required to move the

These adjustments are made manually as the creation dimensions of the rotation square hyperboloid are changed.

By calculating the above equation (2) with an electronic computer, several pairs of Z and X can be found, but the number of pairs to be found can be increased or decreased depending on the required accuracy. The numerical control device 4 connects a large number of points determined by the obtained 2 and
Let it be done at 0. In this case, the fish school data of 2 and X are programmed in advance and stored in the storage device 41 built into the numerical control device 40. Simultaneous 2 output from the numerical control device 40
Among the pulse trains of the axes, the pulse train of the A-axis is driven by the servo motor S.
Ma is applied to move the tool headstock 23 in the direction of the tool rotation axis U to control the distance Z from the intersection OC to the cutting edge rotation plane, and the pulse train for the other B-axis is generated by the servo motor SMt).
, move the work bed 31 in the direction of the work rotation axis V, and calculate the distance X from the intersection Oc to the work creation surface.
control. In this way, when a set of 2 and
i: Since it is machined, each time the workpiece W is rotated once, another set of 2 and X is given, and by sequentially shifting the machining point in the two-axis direction, a rotation square hyperboloid can be created.

Note that it is also possible to control the machining point along a helical locus by shifting the machining point in the Z-axis direction according to the rotation of the workpiece. In this case, the motor for driving the work is also a servo motor, and the numerical control device 40 is programmed with a set of fish school data Cα, Z, X) including the work rotation angle α, and this data allows simultaneous It is sufficient to perform pulse distribution on three axes and apply the distributed pulses to each servo motor.

According to the present invention, the tool is rotated around an axis that makes an angle with the workpiece axis, the tool and the workpiece are controlled to move relative to each other in the direction of the tool rotation axis and the workpiece rotation axis, and the workpiece is rotated. Since the tool moves in a hyperbolic manner on the workpiece creation surface to create a rotation square hyperboloid surface, the cutting speed will not decrease and no uncut material will be left even if the cutting point of the tool is at the center of rotation of the workpiece. .

Furthermore, since the A-axis and B-axis, which are the control axes, do not have to be controlled as a function of the rotation angle of the tool rotating at high speed, control is relatively easy and the mechanical system can be easily designed.

In addition, a and b as the creation dimensions of the rotational square hyperboloid can be changed arbitrarily by adjusting the angle θ formed by the tool rotation axis with respect to the workpiece rotation axis, so the processing device is versatile. It has the advantage of being able to

[Brief explanation of the drawing]

Fig. 1 is a plan view showing a conventional device, Fig. 2 is a diagram explaining the principle of creation of a rotational square hyperboloid according to the present invention, Fig. 3 is a diagram showing the relationship with an inscribed sphere touching a vertex, Figs. Figure 5 shows a processing device that is an embodiment of the present invention, and Figure 4 is a front view;
FIG. 5 is a plan view. 11... Tool support device, 12... Workpiece support device,
20ee・Tool, 23@・Tool headstock, 24・00 Sliding base, 25・Guide base, 26・Swivel base, 27
...Swivel support stand, 30e book/Rotating spindle, 31...Work spatula)", 3" @ 6m111 unit, 336...Slide base, 34.Fist/Guide base, SMa, SMb
···Servomotor. Patent applicant Toyota Machinery Co., Ltd.

Claims (5)

[Claims] (1) A workpiece support device that supports and rotates a workpiece in which a squared hyperboloid of rotation is formed, and a rotational main shaft having a rotational axis inclined with respect to the rotational axis of the workpiece and having a tool protruding eccentrically from one end. a tool headstock rotatably supporting the rotating spindle; a first feeding means for moving the rotating spindle and the workpiece relative to each other in the axial direction of the rotating spindle; It has a second feeding means and a numerical control device, and rotates the tool so that the axis of the main shaft rotated by the first feeding means
In a processing device for cutting, where the rotational diameter of the tool is d, the angle θ between the axis of the rotational spindle and the axis of the workpiece is defined as the amount of movement Z in the axial direction of the rotational spindle by the first feeding means and the second A rotational squared hyperboloid generation processing device characterized in that a rotational squared hyperboloid is generated by controlling the axial movement amount X of a workpiece by a feeding means so as to maintain the following relationship. (2) The first feeding means includes a guide means for slidably guiding a tool headstock rotatably supporting the rotary spindle in the axial direction of the rotary spindle, and a tool headstock guided by the guide means. 2. The rotational square hyperboloid generation processing device according to claim 1, comprising a feed screw mechanism for moving the feed screw mechanism and a servo motor connected to the feed screw mechanism. (3) The second feeding means includes a guide means for slidably guiding the workpiece support device in the direction of the rotational axis of the workpiece, and a feed screw mechanism for moving the workpiece support device guided by the guide means; A rotational square hyperboloid and generation processing device according to claim 1, comprising a servo motor connected to the feed screw mechanism. (4) The first feeding means moves the guide means for guiding the tool headstock around an axis that is perpendicular to a plane including the axis of the rotational spindle and the rotational axis of the workpiece and orthogonal to the axis of the rotational spindle. 3. The rotational square hyperboloid creation processing apparatus according to claim 2, further comprising a turning adjustment means for turning the rotation squared surface. (5) The second feeding means includes a movement adjusting means for adjusting the movement of the guiding means for guiding the work supporting device in a direction perpendicular to the guiding direction. Curved surface creation processing equipment.