JPH07136821A - Elliptic working machine - Google Patents

Abstract

PURPOSE:To carry out elliptic working in a condition of high productivity by reciprocating a driven shaft holding a working tool while being synchronized with the rotation of the shaft. CONSTITUTION:When a driving shaft 2 is rotated, a driven shaft 3 is reciprocated along with a housing 32 synchronously with the rotation of the driving shaft 2, and the inter-shaft interval between the driving shaft 2 and the driven shaft 3 is extended or shortened synchronously with the rotational phases of the driving shaft 2 and the driven shaft 3. The driving shaft 2 and the driven shaft 3 are connected together so that they are rotated synchronously through elliptic gears 24, 31. Even when the inter-shaft interval between the driving shaft 2 and the driven shaft 3 changes, since the driving shaft 2 and the driven shaft 3 are connected together through the elliptic gears 24, 31 of the same shape, the driven shaft 3 is always rotated synchronously with the driving shaft 2. When a cutting tool C is mounted on the front end of the driven shaft 3 so that the cutting tool is protruded to the side of the driving shaft 2 in a condition in which the driven shaft 3 is closest to the driving shaft 2, the cutting tool C is rotated describing an elliptic locus.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elliptical machining device for machining an elliptic cylinder of an engine into an elliptical shape.

[0002]

2. Description of the Related Art When machining the above elliptic cylinder or the like, for example, an NC milling machine is used and the work head is
It is conceivable to perform milling while moving the milling cutter so as to contact the elliptical locus.

According to Japanese Utility Model Publication No. 61-3527, the inner peripheral surface of an elliptical hole is machined by rotating the machining tool with an axis inclined by a predetermined angle with respect to the cutting feed direction of the machining tool as a rotation axis. It is known to have been made.

[0004]

In the case of elliptical machining using the above NC milling machine, the position of the work head must be constantly moved while being calculated, and if it is moved at high speed, it may deviate from the elliptical locus. Therefore, there is a problem that the work head cannot be moved so fast that the productivity is low. Further, in the case where the rotation axis of the processing tool is tilted with respect to the cutting feed direction, there is a problem that an unprocessed portion occurs on the inner peripheral surface of the elliptical hole unless the elliptical hole penetrates.

In view of the above problems, it is an object of the present invention to provide an elliptical machining apparatus which has high productivity and is capable of performing elliptical machining even if the elliptical hole does not penetrate therethrough.

[0006]

In order to achieve the above object, the invention of claim 1 provides a driven shaft parallel to the drive shaft so as to be movable in a direction orthogonal to the rotation axis of the driven shaft, Phase synchronizing means for connecting the driven shaft so as to rotate synchronously with the drive shaft, and 1 for synchronizing with the rotational phase of the driven shaft.
And a driven shaft moving unit that reciprocates the driven shaft once in the orthogonal direction for each rotation, and the processing tool fixed to the driven shaft moves on an elliptical locus.

According to a second aspect of the present invention, in the first aspect of the present invention, the movement direction of the driven shaft is an inter-axis direction with the drive shaft, and the phase synchronizing means is provided for the drive shaft and the driven shaft, respectively. It is characterized by a fixed pair of gears.

According to a third aspect of the present invention, in the first aspect of the present invention, the phase synchronizing means is a misalignment joint provided between a drive shaft or a fixed shaft rotating in synchronization with the drive shaft and a driven shaft. Is characterized in that. What is a misaligned joint?
A joint for transmitting rotational force by connecting two parallel rotating shafts to each other and capable of transmitting rotational force even if the axes of the two rotating shafts are deviated, for example, Oldham coupling・ Schmidt joints, universal joints, etc. correspond to this.

According to a fourth aspect of the present invention, in the first aspect of the present invention, a balance weight is provided on the opposite side of the driven shaft with the drive shaft interposed therebetween, the balance weight being symmetrically reciprocating with respect to the driven shaft. To do.

According to a fifth aspect of the present invention, in the first aspect of the present invention, a second driven shaft that performs an operation symmetrical to the driven shaft is provided on the opposite side of the driven shaft with the drive shaft interposed therebetween. Is characterized by.

[0011]

When a working tool is attached to the driven shaft and the driven shaft is rotated without reciprocating in the direction orthogonal to the rotation axis of the driven shaft, normal perfect circular machining can be performed. If this driven shaft is reciprocated once per revolution, the movement locus of the machining tool becomes elliptical, and elliptical machining can be performed while maintaining the same productivity as in the case of performing normal round machining.

When the driven shaft is reciprocated, the axial distance between the drive shaft and the driven shaft increases or decreases, but if the driven shaft is connected to the drive shaft via an elliptical gear, the axial distance increases or decreases. Even if it changes, the driven shaft can be rotationally driven always in synchronization with the drive shaft. Also, if the driven shaft is connected to the drive shaft or the fixed shaft via a misalignment joint, the number of parts to be replaced can be reduced when changing the reciprocating distance of the driven shaft in order to change the size and oblateness of the ellipse. Can be reduced.

By the way, when the driven shaft reciprocates, vibration occurs, which adversely affects the machining accuracy and the tool life. However, by attaching the balance weight, the vibration can be reduced, thereby improving the machining accuracy. In addition, the life of the processing tool can be extended.

Further, if the second driven shaft is provided instead of the balance weight, the vibration is reduced and the work to be simultaneously processed is doubled, so that the productivity is further improved.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, reference numeral 1 is an elliptical machining apparatus according to the present invention, and in the case of this embodiment, a spindle head 2
It is configured to be attachable and detachable to 1. The elliptical machining device 1 has a frame body 11 that is engaged with a housing of a spindle head 21 and is prevented from rotating, and a drive shaft connected to the rotation shaft of the spindle head 21 with respect to the frame body 11. 2 is rotatably held. A frame 11 is provided on the tip side of the drive shaft 2.
The eccentric portions 22 and 23, which are 180 degrees out of phase with each other, are provided at two locations located inside. Also, the frame 1
A driven shaft 3 which is parallel to the drive shaft 2 is rotatably held in a housing 32 and stored in the housing 1. As shown in FIG. 2, the housing 32 is sandwiched by two sliders 41 which are slidable with respect to two rails 41 which are long in the direction in which the drive shaft 2 and the driven shaft 3 are arranged side by side. Driven shaft 3
Are held together with the housing 32 so as to be reciprocally movable with respect to the drive shaft 2. A slide rail 33 is attached to a surface of the outer surface of the housing 32 facing the drive shaft 2, and the slide rail 33 is mounted on the slide rail 33.
A slider 23a, which is slidable in the holding direction by 1, is rotatably attached to the eccentric portion 23, which is one of the eccentric portions. Therefore, when the drive shaft 2 rotates, the housing 32 reciprocates along the rail 41 via the slider 23a. The balance weight 5 is similarly attached to the other eccentric portion 22 via the slider 22a and the slide rail 51. The balance weight 5 is reciprocally held by the rail 41 similarly to the housing 32, and when the drive shaft 2 is rotated, the housing 32 and the balance weight 5 move symmetrically with the drive shaft 2 interposed therebetween. The processing apparatus 1 as a whole is configured to reduce vibration.

When the drive shaft 2 rotates as described above, the driven shaft 3 reciprocates together with the housing 32 in synchronization with the rotation of the drive shaft 2. Therefore, the distance between the drive shaft 2 and the driven shaft 3 becomes the drive shaft 2 and the driven shaft. It increases or decreases in synchronization with the rotation phase of the shaft 3. Therefore, the drive shaft 2 and the driven shaft 3 have the same shape of the elliptical gear 24.
It was connected via 31 so as to rotate synchronously. With such a configuration, even if the axial distance between the drive shaft 2 and the driven shaft 3 changes, the drive shaft 2 and the driven shaft 3 have the elliptical gears 24.3.
The driven shaft 3 is always connected to the drive shaft 2 because they are connected via 1
It is rotated in synchronization with. Then, as shown in the drawing, a bite C is attached to the tip of the driven shaft 3 so that the driven shaft 3 projects toward the drive shaft 2 with the driven shaft 3 being closest to the drive shaft 2.

With the above-described structure, when the drive shaft 2 is rotated, the driven shaft 3 is rotated synchronously and reciprocally moved in synchronization with the rotation of the driven shaft 3. As a result, the bite C rotates while drawing an elliptical locus. Thus, the work W can be bored in the elliptical hole by advancing the spindle head 21 along the axial direction of the driven shaft 3 while rotating the cutting tool C in an elliptical shape.

By the way, in the above embodiment, the elliptical gear 31 is directly attached to the driven shaft 3, but as shown in FIG. 3, the portion where the elliptical gear 31 is attached is separated from the driven shaft 3 and the separated portion is That is, between the fixed shaft 61 fixed to the frame body 11 and the driven shaft 3, an Oldham's joint, a Schmidt joint, a universal joint and other misaligned joints 62 are provided.
The fixed shaft 61 and the driven shaft 3 are connected to each other with the interposition of the.
-64 may be used.

Further, as shown in FIG. 4, the drive shaft 2 is provided with only the eccentric portion 22, and the eccentric portion 71 is provided at the rear end portion of the driven shaft 3 in place of the eccentric portion 23. Attach the slider 73 to the cup 72 that holds the
The slide rail 74 that engages with the slider 73 is attached to the frame body 1.
It may be fixed to 1. In the case of this embodiment, by connecting the drive shaft 2 and the driven shaft 3 via the elliptical gears 24 and 31, the driven shaft 3 is rotated in synchronization with the rotation of the drive shaft 2 and The rotation of the driven shaft 3 causes the eccentric portion 71 to move eccentrically. The eccentric movement of the eccentric portion 71 is converted into the reciprocating movement of the driven shaft 3 along the rail 41 by the cooperation of the slider 73 and the slide rail 74. In this way, by causing the driven shaft 3 to reciprocate by the rotation of the driven shaft 3 itself, the locus of the bite C can be perfectly matched with the elliptical locus even if some backlash occurs between the elliptical gears 24 and 31. This makes it possible to further improve the processing accuracy.

In each of the above embodiments, the drive shaft 2 and the driven shaft 3 are
Although and are connected by the elliptical gears 24 and 31, a normal circular gear may be eccentrically attached and used.

By the way, in each of the above-mentioned embodiments, the cutting tool C is projected from the outer peripheral surface of the driven shaft 3 to perform the boring of the elliptical hole. Alternatively, a cutting tool may be attached to perform an outer diameter processing of an elliptical shape. Alternatively, it is also possible to attach a work to the tip of the driven shaft 3 and process the outer diameter of the work into an elliptical shape with a cutting tool fixed to the outside. Further, instead of the cutting tool, a honing grindstone may be attached to perform honing processing on the elliptical surface.

Further, in each of the above embodiments, the elliptical machining is performed by reciprocating the driven shaft in the axial direction with the drive shaft. However, the reciprocating direction of the driven shaft is relative to the rotation axis of the driven shaft. It may be any direction as long as it is an orthogonal direction, and is not limited to the inter-axis direction with the drive shaft.

Further, although the balance weight is attached in each of the above-mentioned embodiments, as shown in FIG. 5, the same driven shaft 3 as the second driven shaft 7 is used as the second driven shaft 7 in place of the balance weight. By installing symmetrically with respect to
Vibration can be reduced as in the case where the balance weight is provided, and two workpieces W can be simultaneously processed.

[0024]

As is apparent from the above description, according to the present invention, the driven shaft for holding the working tool is reciprocally moved in synchronization with the rotation of the driven tool to perform the elliptic machining. It is possible to ensure the same productivity as when machining is performed, and when performing boring of an elliptical hole, boring can be performed even if the elliptical hole is a blind hole.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a first embodiment of the present invention.

FIG. 2 II-II sectional view

FIG. 3 is a diagram showing a main part of a configuration of a second embodiment.

FIG. 4 is a diagram showing a main part of a configuration of a third embodiment.

FIG. 5 is a diagram showing a main part of a configuration of a fourth embodiment.

[Explanation of symbols]

 1 Elliptical Machining Device 2 Drive Shaft 3 Driven Shaft 5 Balance Weight 7 (Second) Driven Shaft 24 Elliptical Gear 31 Elliptical Gear 41 Rail 62 Misaligned Joint C Bit

Claims (5)

[Claims] 1. A phase synchronizing means for arranging a driven shaft parallel to the drive shaft so as to be movable in a direction orthogonal to a rotation axis of the driven shaft, and for connecting the driven shaft so as to rotate in synchronization with the drive shaft. And a driven shaft moving means that reciprocates the driven shaft once in the orthogonal direction in synchronization with the rotation phase of the driven shaft, so that the machining tool fixed to the driven shaft moves on an elliptical locus. An elliptical machining device characterized in that 2. The moving direction of the driven shaft is a direction between the driving shaft and the driving shaft, and the phase synchronizing means is a pair of gears fixed to the driving shaft and the driven shaft, respectively. The elliptical processing device according to claim 1. 3. The ellipse according to claim 1, wherein the phase synchronization means is a misalignment joint provided between a driven shaft or a fixed shaft that rotates in synchronization with the drive shaft and a driven shaft. Processing equipment. 4. The opposite side of the driven shaft with the drive shaft interposed therebetween,
2. The elliptical machining device according to claim 1, further comprising a balance weight that reciprocates symmetrically with respect to the driven shaft. 5. The elliptical machining apparatus according to claim 1, further comprising a second driven shaft that is symmetrical to the driven shaft and is provided on the opposite side of the driven shaft with the drive shaft interposed therebetween.