JPH11207506A - Multi-shaft machining device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simultaneously and accurately machine coaxial and/or eccentric parts to be machined. SOLUTION: A multi-shaft machining device is provided with inner and outer spindles 5 and 6 provided to be eccentric and rotary-driven at equal angular velocities around an axis, a bush inner diameter tool 11 and a crescent inner diameter tool provided to be coaxial in the inner spindle 5, a crescent outer diameter tool 13 and a body inner diameter tool 14 provided to be coaxial in the outer spindle 6, an axial direction moving mechanism for correcting the position of the bush inner diameter tool 11 in an axial direction, a tool holder diameter direction moving mechanism for correcting the position of the body inner diameter tool 14 in a diameter direction, and a correction driving means for driving both moving mechanism by specified amounts based on a work machining state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-axis machining apparatus, and more particularly, to a multi-axis machining apparatus for simultaneously machining a plurality of machining portions on one work.

[0002]

2. Description of the Related Art For example, an internal gear pump is shown in FIG.
As shown in the figure, the drive internal gear GS is housed in the body BD in a state of being in contact with the driven external gear GL, and the drive internal gear GS and the driven external gear GL are eccentrically meshed with each other. A bush 1 for inserting a drive shaft connected to the drive internal gear GS and a tooth tip (outer circumference) of the drive internal gear GS and a tooth tip (inner circumference) of the driven external gear GL are in contact with the body BD. A protruding crescent CR and a suction port and a discharge port (not shown) are formed.

The body B of such an inscribed gear pump
When manufacturing D, a tool for forming the inner diameter 1 of the bush (referred to as a bush inner diameter tool 11) is generally used.
A tool for forming the inner surface 2 of the crescent CR in contact with the bottom surface of the body BD accommodating the driving internal gear GS and the tooth tip of the driving internal gear GS (referred to as a crescent inner diameter tool 12).
And the surface of the bottom surface of the body BD accommodating the driven external gear GL and the crescent CR contacting the tip of the driven external gear GL
(Hereinafter referred to as a crescent outer diameter tool 13) and a tool (hereinafter referred to as a body inner diameter tool 14) for forming the inner side surface 4 of the body BD with which the outer periphery of the driven external gear GL contacts. Used.

The coaxiality between the bush inner diameter 1 and the crescent inner diameter 2 and between the crescent outer diameter 3 and the body inner diameter 4, and
High precision is required for the eccentricity of the inner diameter of the crescent 2 and the inner diameter 4 of the body. In addition, body inside diameter 4, crescent outside diameter 3
Also, the size of the crescent inner diameter 2 requires high molding accuracy. Further, between the bottom surface of the body BD for accommodating the driving internal gear GS formed by the crescent inner diameter tool 12 and the bottom surface of the body BD for accommodating the driven external gear GL formed by the crescent outer diameter tool 13. (See the symbol N in FIG. 12) must be avoided.

[0005] The body B of such an inscribed gear pump
In general, a conventional processing apparatus for manufacturing D has a bush inner diameter tool 11 and a crescent inner diameter tool 12 arranged so as to face each other. in which the forming the bushing inner diameter 1 and Crescent inner diameter 2, and front and rear therewith to form a crescent outer diameter 3 and body inner diameter 4 with a center C ₂ eccentric with the center C ₁ of the bushing inner diameter 1 and Crescent inner diameter 2 (This conventional processing apparatus is referred to as a two-sided processing apparatus). Each tool is attached to a tool holder provided on the spindle so as to be able to correct each tool.

Japanese Patent Application Laid-Open No. 9-155611 discloses a method of cutting a cylinder head for the purpose of improving the processing accuracy. This is particularly for solving the problem caused by the decrease in mutual positional accuracy between the valve guide hollow portion and the reamer, and a valve guide and a valve seat for a plurality of intake valves or exhaust valves provided on a cylinder head. In a cutting method of a cylinder head that performs concentric cutting processing on a machining center, a numerically controllable machining center is equipped with a measuring unit and a cutting tool, and first, a measuring unit is positioned on the machining head of the machining center, and The center of the hole of the valve guide of the cylinder is measured individually and in a predetermined order by a measuring unit, and the numerical data of the measurement result from the measuring unit is stored. Then, the machining head of the machining center is mounted on the machining head of the machining center. Position the tool and correct the position of the cutting tool based on the numerical data. Want the valve guide of the cylinder head by cutting tools and and the valve seat individually is to cut into a predetermined order.

[0007]

The conventional two-sided machining apparatus includes a bush inner diameter tool 11 and a crescent inner diameter tool 1.
2 is difficult to arrange coaxially, and both tools 1
Since the entire processing apparatus is lengthened by arranging the tools 1 and 12 to face each other, even if the two tools 11 and 12 can be arranged coaxially, the coaxial may be maintained due to a temperature change or the like. It was difficult.

Further, since the formation of the bush inner diameter 1 and the crescent inner diameter 2 and the formation of the crescent outer diameter 3 and the body inner diameter 4 are performed separately, there is a problem that the number of steps is large and processing time is required. .

Further, since the outer diameter 3 of the crescent and the inner diameter 4 of the body are larger than the inner diameter 1 of the bush and the inner diameter 2 of the crescent, the peripheral speeds of the outer diameter tool 13 and the inner diameter tool 14 are relatively high. There has been a problem that wear is accelerated. When the wear amount of the crescent outer diameter tool 13 and the body inner diameter tool 14 is not corrected, as shown in FIG. There is a problem in that a step is generated in N between the portion that is not to be formed. Conventionally, in order to prevent the deterioration of the molding accuracy due to these wears, it is necessary to correct the tool manually, and it is complicated.In addition, since the adjustment amount is small, it is difficult to perform the correction manually. There was a problem.

On the other hand, in the method of cutting a cylinder head disclosed in Japanese Patent Application Laid-Open No. 9-155611, the measuring unit and the cutting tool are coaxially positioned with respect to the machining head of the machining center. Includes the problem that there is no assurance that can be made. In addition,
It is intended to correct the position of the cutting tool in order to cut the valve seat concentrically with respect to the hole of the valve guide, and does not consider correction due to wear of the cutting tool. In this method, the valve seat is cut concentrically into the existing hole of the valve guide, and the hole of the valve guide and the valve seat are simultaneously machined. It is not intended to simultaneously process a plurality of processing portions on the workpiece.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a multi-axis machining apparatus capable of simultaneously and accurately machining coaxial and / or eccentric machining portions.

[0012]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is a multi-axis machining apparatus for machining a plurality of machining portions on one work at the same time, comprising a coaxial and / or eccentric machining apparatus. A plurality of spindles which are provided in a state where the spindles are rotated at an equal angular velocity around an axis, a tool provided for each spindle, a correction means for correcting the position of the tool, and a correction drive means for driving the correction means based on the machining state And characterized in that:

In the present invention, when a plurality of tools are provided on each spindle, these tools are driven to rotate coaxially.
Further, when the spindles are arranged in an eccentric state, the eccentricity of the tool provided on each spindle is maintained. Then, by rotating the spindles at a constant angular velocity, it is possible to machine each machining portion at the same time without interference of the tools provided on each spindle. In addition, since the peripheral speed is different depending on the tool and the wear speed is different because the tool is driven to rotate at a constant angular speed, the required amount of the predetermined correcting means is corrected in a predetermined direction by the correction driving means based on the processing state. Product accuracy is maintained.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a multi-axis machining apparatus according to the present invention will be described in detail with reference to FIGS. In this embodiment, as described above, a multi-axis machining apparatus for manufacturing a body of an inscribed gear pump will be described. In the drawings, the same reference numerals denote the same or corresponding parts.

[0015] The multi-axis machining apparatus according to this embodiment includes:
In general, a multi-axis machining apparatus for simultaneously machining a workpiece W with a bush inner diameter 1 and a crescent inner diameter 2 and a crescent outer diameter 3 and a body inner diameter 4 having a center C ₂ eccentric from the center C _1. An inner spindle 5 and an outer spindle 6 which are eccentrically provided and driven to rotate at an equal angular speed around an axis; a bush inner diameter tool 11 and a crescent inner diameter tool 12 which are provided coaxially with the inner spindle 5; The crescent outer diameter tool 13 and the body inner diameter tool 14 provided above, correction means (described later) for correcting the position of each tool (12, 14) in a predetermined direction, and each correction means based on the machining state. Correction driving means (to be described later) for driving by a predetermined amount.

As shown in FIG. 1, the inner spindle 5
The outer spindle 6 is rotatably supported on the inside and outside of the support cylinder 20 via bearings 21 and 22 so as to be rotatable around an axis. The inner spindle 5 and the outer spindle 6 are provided with pulleys 23 and 24, respectively, and have belts 29 between pulleys 27 and 28 having different diameters provided on a single rotary drive shaft 26 having a drive pulley 25. , 30 are wound and the number of rotations per unit time is equal,
That is, it is driven to rotate at a constant angular velocity. In the case of this embodiment, the centers C ₁ and C ₂ of the rotation axes of the inner spindle 5 and the outer spindle 6 are eccentric according to the body BD of the inscribed gear pump to be manufactured. Further, a drawbar 7 described later is inserted into the inner spindle 5 so as to be movable in the axial direction.

As shown in FIG. 3, a base block 42 on which a tool holder 41 for holding the bush inner diameter tool 11 is mounted via a base plate 40, and a tool for holding the crescent inner diameter tool 12 on the end surface of the inner spindle 5 as shown in FIG. A base holder 52 to which the holder 51 is attached is fixed. On the other hand, as shown in FIG. 4, a base block 62 to which a tool holder 61 for holding the crescent outer diameter tool 13 is attached is provided on the end surface of the outer spindle 6.
And a base block 72 to which a tool holder 71 for holding the body inner diameter tool 14 is attached. As shown in FIG. 2, the base plate 40 fixed to the inner spindle 5 and the base blocks 62 and 72 fixed to the outer spindle 6 are separated so as to have a predetermined gap. The rotation of the spindles 5 and 6 at a constant angular velocity does not interfere with each other.

The tool holder 41 for holding the bush inner diameter tool 11 has a positioning protrusion 43 formed thereon (FIG. 3), and a positioning protrusion 4 formed in a recess 44 formed in the base block 42.
3 are fitted and fixed by bolts 45. The bush inner diameter tool 11 is attached to the tool holder 41 so as to be detachable and position adjustable.

As shown in FIG. 3, the crescent inner diameter tool 1
The base holder 52 to which the tool holder 51 for holding the base 2 is attached is composed of an axially movable block 53 attached to the base plate 40 so as to be movable in the axial direction, and a tool holder 51 attached to the axially movable block 53. A tool holder supporting block 54 for supporting the tool; and an axial moving mechanism 80 for moving the axially movable block 53 in the axial direction, and a tool holder radial moving mechanism 81 for moving the tool holder 51 in the radial direction. I have.

The axially movable block 53 is shown in FIGS.
As shown in FIG. 5, a plurality of (four in the example shown by the broken line in FIG. 5) space 55 and the through-hole 5 communicating with this space 55
6 are formed, the intermediate portions of the corresponding bolts 57 screwed and fastened to the base plate 40 are respectively inserted into the through holes 56, and a coil spring or a flat plate is provided between the bottom of the space 55 and the head of the bolt 57. An elastic body 58 such as a spring is interposed. Thereby, the axial direction movable block 53 is supported in a state of being elastically urged with a predetermined force with respect to the base plate 40, and can move in the axial direction (the left and right direction in FIGS. 3 and 6). Has become.

The tool holder support block 54 is detachably attached to the axially movable block 53 by an attachment / detachment mechanism 82. The attachment / detachment mechanism 82 includes a tapered engagement hole 83 formed in the axially movable block 53, and a tool holder support block 5 corresponding to the engagement hole 83.
4, a pair of locking portions 85 formed in a direction perpendicular to the inside of the engagement hole 83, and a tapered portion 84.
And a pair of top members 87 that are screwed to the double screws 86 and that can be locked to the locking portions 85 respectively. When attaching the tool holder support block 54 to the axially movable block 53, the double screw 86 is adjusted so that the top members 87 are brought close to each other so that the top members 87 do not protrude from the side surfaces of the tapered portions 84. Engagement hole 83
And a double screw 86 is rotated through a detachable operation hole 88 formed in the axially movable block 53 to
Are separated from each other. Then, the top member 87 is moved to the locking portion 8.
5, the tool holder support block 54 is attached to the axially movable block 53. A pin 89 that comes into contact with the bottom surface of the engagement hole 83 when the tool holder support block 54 is mounted on the axially movable block 53 is inserted through the tip of the tapered portion 84. An inclined portion is formed on the head of the pin 89 so that the tip of the pin 89 projects when the double screw 86 is rotated to bring the top members 87 closer to each other. When removing the tool holder support block 54 from the axially movable block 53, the double screw 86 is used to release the top member 87 from the locking portion 85.
Is rotated to bring the top members 87 close to each other, so that the pins 89 protrude and press the bottom surface of the engagement holes 83, so that the tapered portion 84 can be easily pulled out from the engagement holes 83.

The tool holder 51 is supported by screwing a bolt 91 to a nut 90 provided on the tool holder support block 54.

As shown in FIGS. 3 and 7, an axial moving mechanism 80 for moving the axially movable block 54 in the axial direction is disposed at the tip of the drawbar 7 so as to be inclined at a predetermined angle with respect to the axis. Key 95 that works like a cam
A wedge member 96 having a predetermined inclination inserted between the base plate 40 and the axially movable block 53;
A radial moving member 97 that is engaged with the key 95 and is coupled to the wedge member 96 and moves the wedge member 96 in the radial direction by moving the drawbar 7 in the axial direction.

The key 95 is formed of a ridge formed on the opposite side surface at a predetermined angle with respect to the axis near the tip of the draw bar 7. The base end (the right side in the figure) of the drawbar 7 moves forward and backward with respect to the radial direction moving member 97.
Advancing / retreating means (not shown) capable of moving the inside of the inner spindle 5 by a desired amount in the axial direction is connected. As shown in FIG. 7, the radial direction moving member 97 is formed with a groove 97a to be engaged with the key 95 of the drawbar 7. An inclined surface 53a is formed on the axially movable block 53 so as to correspond to the wedge member 96,
Further, the base plate 40 and the axially movable block 5
The groove 3 is formed with a groove for receiving a ridge formed in the radial direction of the wedge member 96 to guide the radial movement of the wedge member 95 (see FIG. 6). In this embodiment, as the wedge member 96 moves away from the drawbar 7, the axially movable block 53
It is formed so as to approach. Although not shown, a long hole or the like is formed in the wedge member 96 so as not to interfere with the bolts 57 shown in FIG. In the embodiment shown in FIG. 3, when the drawbar 7 is driven to move forward to the left in the figure, the radial moving member 97 and the wedge member 96 connected thereto are tilted by the inclination of the key 95 to be engaged. It moves slightly downward, so that the axially movable block 53 moves slightly further backward. In this manner, the axially movable block 53 can be moved in the axial direction, thereby constituting a correcting means for correcting the axial position of the crescent inner diameter tool 12.

As shown in FIG. 3, a tool holder radial moving mechanism 81 for moving the tool holder 51 in the radial direction includes a dovetail groove 100 formed in the tool holder 51 and a dovetail groove 100.
And a dovetail member 102 slidably provided in a direction perpendicular to the radial direction of the tool holder support block 54 by rotating the bolt 101 screwed and engaged with the dovetail groove 100. The dovetail portion 102a of the dovetail member 102 engaged with the dovetail member 102 is, as shown by a chain line in FIG. 2, with respect to the axis of the bolt 101 screwed to the dovetail member 102, that is, the tool holder of the dovetail member 102. It is formed so as to be inclined at a predetermined angle with respect to the moving direction in the support block 54. When the member 102 is moved in a direction perpendicular to the radial direction of the tool holder support block 54 by rotating the bolt 101, the dovetail portion 10
The surface pressure between 2a and the dovetail groove 100 engaged,
The tool holder 51 slightly moves in the radial direction with respect to the axis of the inner spindle 5. In this manner, the tool holder 51 can be moved in the radial direction, so that a correcting means for correcting the radial position of the crescent inner diameter tool 12 held by the tool holder 51 is configured. .

As shown by a broken line in FIG.
A wedge-shaped tool holding member 111 is inserted through an intermediate portion of the bolt 110. FIG. 9 shows a cross section of the wedge-shaped tool holding member 111 by tightening a bolt 110.
Clamps the crescent inner diameter tool 12 with the tool holder 51. A bolt 113 is screwed into the base end surface of the crescent inner diameter tool 12, and a tool receiving member 114 receiving the bolt 113 is attached to the tool holder 51 by the bolt 1.
15 is provided so as to be able to advance and retreat. By adjusting the bolts 113 or 115, the position of the tool in the axial direction can be determined.

On the other hand, as shown in FIG. 4, a base block 62 to which the tool holder 61 of the crescent outer diameter tool 13 is attached is fixed to a fixed block 63 fixed to the outer spindle 6 and is detachably attached to the fixed block 63. A tool holder support block 64 for supporting the tool holder 61, and a tool holder radial moving mechanism 81 for moving the tool holder 61 in the radial direction.

The tool holder support block 64 is detachably attached to the fixed block 63 by an attachment / detachment mechanism 82. The attachment / detachment mechanism 82 includes a tapered engagement hole 83 formed in the fixed block 63, a tapered portion 84 provided in the tool holder support block 64 so as to correspond to the engagement hole 83, and an inside of the engagement hole 83. A pair of locking portions 85 formed in a direction perpendicular to the direction, a double screw 86 formed in the opposite direction disposed on the tapered portion 84, and screwed to the double screw 86 to lock the locking portion 85. Since it is provided with a pair of possible top members 87 and has the same configuration as the base holder 52 of the above-described crescent inner diameter tool 12, the same reference numerals are given and the description thereof is omitted.

The tool holder radial moving mechanism 81 for moving the tool holder 61 in the radial direction constitutes a correcting means for correcting the radial position of the crescent outer diameter tool 13. Since the configuration is the same as that of the base holder 52 of the tool 12, the same reference numerals are given and the details are omitted.

Further, similarly to the crescent inner diameter tool 12, the crescent outer diameter tool 13 is provided with a wedge-shaped tool holding member 111 or the like inserted through an intermediate portion of the bolt 110 as shown in a broken line in FIG. Positioning is clamped.

As shown in FIG. 4, the base block 72 to which the tool holder 71 of the body inner diameter tool 14 is attached is
Fixed block 73 fixed to outer spindle 6
And a tool holder support block 74 which is detachably attached to the fixed block 73 and supports the tool holder 71, and further comprises a tool holder radial moving mechanism 82 for moving the tool holder 71 in the radial direction. Parts similar to those of the crescent outer diameter tool 13 are denoted by the same reference numerals and omitted, and only different parts will be described below.

Each of the tools 11, 1 driven to rotate at a constant angular velocity
12, 2, and 14, since the radius of rotation of the body inner diameter tool 14 is the largest, its peripheral speed is the fastest, and then the peripheral speed of the crescent outer diameter tool 13 is faster. For this reason, the body inner diameter tool 14 and then the crescent outer diameter tool 13 wear faster than the bush inner diameter tool 11 and the crescent inner diameter tool 12, and the dimensional accuracy is reduced by the manufactured body BD. Thus, in this embodiment, as a correction driving means for automatically driving the correction means based on the machining state, in this embodiment, means for driving the above-described axial moving mechanism 80 for moving the crescent inner diameter tool 12 in the axial direction (see FIG. (Omitted) and means 120 for driving a tool holder radial moving mechanism 81 for moving the body inner diameter tool 14 in the radial direction.
In this embodiment, the crescent inner diameter tool 12
The tool holder radial moving mechanism 81 that moves the crescent outer diameter tool 13 in the radial direction has a higher frequency of correction than the required frequency of axial correction of the crescent inner diameter tool 12 and radial correction of the body inner diameter tool 14. Therefore, the correction is made by manually rotating each bolt 101.

The means for driving the axial moving mechanism 80 moves the drawbar 7 forward and backward in the axial direction by a predetermined amount. For example, a thread is formed at the base end of the drawbar 7 and a nut is screwed into the drawbar 7. Can be rotated by a desired amount by a stepping motor or the like.

The means 120 for driving the tool holder radial direction moving mechanism 81 of the body inner diameter tool 14 rotates the bolt 101 by a predetermined amount. In this embodiment, as shown in FIG. A driving device 1 such as a stepping motor capable of rotating and driving a bolt 101 to which a dovetail member 102 of a direction moving mechanism 81 is screwed by a desired amount
21 and an advance / retreat moving device 122 for moving the drive device 121 forward / backward when the bolt 101 is at a predetermined position. As shown in FIG. 2, the bolt 101 of the tool holder radial direction moving mechanism 81 of the body inner diameter tool 14 has an extended portion 101a formed so as to protrude outside the base block 72, and a cross section of the protruded extended portion 101a is formed. It is formed in a hexagon. Then, as shown in FIG. 10, the extension 10 of the bolt 101 is
There is provided a socket 121a that engages with the first la. In the case of this embodiment, the drive device 121 is attached to a support base 126 guided by a guide 125 and can move up and down. Reciprocating device 122
In this embodiment, an air cylinder is used, and the tip 122a of the piston rod is
6. Although not shown, the socket 1 of the driving device 121 is attached to the extension 101a of the bolt 101.
Position of the extension 101a so that the extension 21a can be engaged, that is, when the rotation axis of the drive shaft of the drive device 121 and the rotation axis of the bolt 101 are aligned. And a stop device such as a brake for stopping at least the rotation of the outer spindle 6 at a predetermined position.

Crescent inner diameter tool 1 based on machining state
In this embodiment, although not shown, a means for driving the axial moving mechanism 80 and a body for automatically correcting the axial position of the second and the radial position of the body inner diameter tool 14 by a predetermined amount, respectively. A means for controlling a means 120 for driving a tool holder radial moving mechanism 81 of the inner diameter tool 14, a means for measuring an actual dimension of a workpiece after machining, and a means for driving an axial moving mechanism 80 based on the measurement information; There is provided a measuring means for sending to a means for controlling the means 120 for driving the tool holder radial moving mechanism 81. The measuring unit measures the manufactured body BD at a plurality of predetermined portions, for example, and feeds back the measurement information to the control unit. The control means calculates the average of each part, and when the average value, for example, the value of the body inner diameter is out of the allowable range, the rotation of the spindle is automatically stopped at a predetermined phase, and the air cylinder 122 is stopped. By lowering the support base 126 by driving the extension, the socket 121a of the stepping motor 121 is engaged with the extension 101a of the tool holder radial moving mechanism 81, and the radial position of the body inner diameter tool 14 is corrected by a required amount. . Further, the bottom surface of the body BD for accommodating the driving internal gear GS formed by the crescent inner diameter tool 12 and the crescent outer diameter tool 1
In the event that there is a step equal to or greater than the allowable height difference between the bottom surface of the body BD for accommodating the driven external gear GL formed by the shaft 3 and the bottom surface (reference numeral N in FIG. 12), the axial movement mechanism is automatically provided. The drive means 80 is driven, that is, the drawbar 7 is driven forward in FIG. 3 so that the radially moving member 97 and the wedge member 96 connected thereto are inclined by the inclination of the key 95 to be engaged. The crescent inner diameter tool 12 and the crescent outside tool are moved slightly downward, and the axially movable block 53 is further retreated so as to retreat the crescent inner diameter tool 12 relatively to the crescent outer diameter tool 13. Correction is automatically made so that the position of the radial tool 13 in the axial direction becomes the same. In this embodiment, the correction of each of the tools 12 and 14 has been described by an example in which the actual dimensions of the workpiece W that has been processed are measured. However, the present invention is not limited thereto. It may be performed every time a predetermined number of workpieces are machined according to the assumed wear of the tool. Also,
In this embodiment, the means 120 for driving the tool holder radial moving mechanism 81 is used to
Although only the bolt 101 of the tool holder radial moving mechanism 81 is automatically rotated, the present invention is not limited to this, and the radial position of the crescent outer diameter tool 13 is automatically adjusted. The bolt 101 of the tool holder radial direction moving mechanism 81 of the crescent outer diameter tool 13 can also be configured to be rotationally driven so as to be able to perform the correction. Furthermore, Crescent outer diameter tool 1
The base block 62 may be provided with an axial moving mechanism 80 for moving the tool holder 61 in the axial direction so that the position in the axial direction 3 can be automatically corrected.

When the work W is machined by the multi-axis machining apparatus constructed as described above, the work W is clamped by the clamper 130 as shown by a chain line in FIGS. The bushing inner diameter tool 11, the crescent inner diameter tool 12, the crescent outer diameter tool 13, and the body inner diameter tool 14 are relatively approached to one surface of the work W while being rotated at a constant angular speed to cut the work W. The bush inner diameter tool 11 and the crescent inner diameter tool 12 are mounted on the same inner spindle 5, and the crescent outer diameter tool 13 and the body inner diameter tool 14 are mounted on the same outer spindle 6 and are driven to rotate. The coaxiality of the inner diameter 1 and the inner diameter 2 of the crescent and the outer diameter 3 of the crescent and the inner diameter 4 of the body can be formed with high accuracy and simultaneously. Bearings 21 and 22 are provided in a state where the eccentricity of the inner spindle 5 to which the bush inner diameter tool 11 and the crescent inner diameter tool 12 are mounted and the outer spindle 6 to which the crescent outer diameter tool 13 and the body inner diameter tool 14 are mounted are set in advance. Therefore, the eccentricity of the bush inner diameter 1 and the crescent inner diameter 2 and the crescent outer diameter 3 and the body inner diameter 4 can be formed with high accuracy. Furthermore, these processing parts 1, 2, 3, 4
Since the inner spindle 5 and the outer spindle 6 are driven at the same angular velocity to simultaneously machine the workpiece W, the position of the tool can be automatically corrected in accordance with the progress speed of wear depending on the tool. The machining can be performed well, and the correction according to the wear amount of the tool can be easily and reliably performed.

In this embodiment, a multi-axis machining apparatus for manufacturing the body BD of the internal gear pump has been described. However, the multi-axis machining apparatus of the present invention is not limited to this. Instead, it can be used for the purpose of processing another work. Further, the multi-axis machining apparatus of the present invention is not limited to the inner spindle 5 and the outer spindle 6 arranged in an eccentric state, but may be one in which the inner spindle 5 and the outer spindle 6 are coaxially arranged. The present invention can be applied to a case in which another spindle is provided in addition to the inner spindle 5 and the outer spindle 6. Further, the tools attached to the inner spindle 5 are not limited to the bush inner diameter tool 11 and the crescent inner diameter tool 12, and the tools attached to the outer spindle 6 are the crescent outer diameter tool 13 and the body inner diameter tool 1.
It is not limited to four. Furthermore, when the tool is a cutting tool, for example, a bush inner diameter tool 11 is attached to a flow passage for supplying coolant to the tool tip for the purpose of improving tool life, cooling, chip flowing, and the like. May be provided so as to communicate with the base plate 40, the base block 42, the tool holder 41, and the like.

[0038]

According to the present invention, a plurality of spindles provided coaxially and / or eccentrically and driven to rotate at an equal angular speed around an axis, tools provided on each spindle, and correction for correcting the position of the tool are provided. Means, and a correction driving means for driving the correction means based on the processing state, when a plurality of tools are provided on each spindle, these tools are driven to rotate coaxially, and When eccentrically arranged, the eccentricity of the tool provided on each spindle is maintained. Then, by rotating the spindles at a constant angular velocity, it is possible to machine each machining portion at the same time without interference of the tools provided on each spindle. In addition, since the peripheral speed is different depending on the tool and the wear speed is different because the tool is driven at a constant angular speed, the required amount of correction is corrected in a predetermined direction by a correction driving unit based on a machining state.
The accuracy of the processed product is maintained. Therefore, coaxial and / or
Alternatively, it is possible to provide a multi-axis machining apparatus capable of simultaneously machining eccentric machining portions with high accuracy.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a main part of a multi-axis machining apparatus according to the present invention.

FIG. 2 is a front view of the multi-axis machining apparatus according to the present invention.

FIG. 3 is a vertical sectional side view of FIG. 2;

FIG. 4 is a cross-sectional plan view of FIG. 2;

FIG. 5 is a rear view of a base plate fixed to an inner spindle, on which a base block for holding a tool holder of a bush inner diameter tool and a base holder for holding a tool holder of a crescent inner diameter tool are mounted, and movable in the axial direction with respect to the base plate. It is explanatory drawing which shows arrangement | positioning of the mechanism for elastically supporting a block.

FIG. 6 is a cross-sectional view for explaining an axially movable block which is elastically supported by a predetermined force with respect to a base plate and is movably supported in an axial direction.

FIG. 7 is a sectional view taken along the line AA of FIG. 3 for explaining an axial moving mechanism for moving the axially movable block in the axial direction.

FIG. 8 is a sectional view taken along the line BB of FIG. 2 for explaining a tool holder radial direction moving mechanism that moves the tool holder in the radial direction.

FIG. 9 is a cross-sectional view taken along the line CC of FIG. 2 for explaining a mechanism for holding a tool on a tool holder.

FIGS. 10A and 10B are a front view and a side view showing a means for driving a tool holder radial movement mechanism for radially moving a body inner diameter tool.

FIG. 11 is a perspective view showing an internal gear pump using a body manufactured in the present embodiment.

FIG. 12 is an explanatory diagram showing a trajectory of each tool.

[Description of sign]

 W Work 5 Inner spindle 6 Outer spindle 11 Bush inner diameter tool 12 Crescent inner diameter tool 13 Crescent outer diameter tool 14 Body inner diameter tool 81 Axial moving mechanism (correcting means) 82 Tool holder radial moving mechanism (correcting means) 120 Correcting driving means

Continued on the front page (72) Inventor Junichi Yamashita 788 Negana, Hamakita City, Shizuoka Prefecture Enshu Co., Ltd. Cross Office (72) Inventor Mihiko Tomioka 26, Hirako Yoshiharacho, Toyota City, Aichi Prefecture Fuji Seiko Co., Ltd.

Claims (1)

[Claims] 1. A multi-axis machining apparatus for simultaneously machining a plurality of machining portions on one workpiece, comprising: a plurality of coaxially and / or eccentrically arranged machines which are driven at a constant angular velocity around an axis. A multi-axis machining apparatus comprising: a spindle; a tool provided on each spindle; a correction unit for correcting a position of the tool; and a correction driving unit for driving the correction unit based on a processing state.