JPH0240466B2 - NAGAENKEIODANMENKEIJOOJUSURUHIKAKOBUTSUNAISHUMENNOSOSEIKAKOSOCHI - Google Patents

Description

Detailed Description of the Invention The present invention utilizes the planetary rotational motion of the planetary gear to cause the workpiece to perform an elliptical motion, that is, an elliptical motion while maintaining a constant directionality. A workpiece having an elliptical shape, that is, an oval cross-sectional shape, is created in which a cylindrical inner peripheral surface having an oval cross-sectional shape is created on the inner peripheral side of the workpiece by a tool that rotates in synchronization with the revolution. The present invention relates to a generating processing device for the inner peripheral surface of a workpiece.

Conventionally, it has not been easy to machine the inner circumferential surface of a workpiece with high precision so that it has an oval cross-sectional shape, and for this reason, it has been difficult to create a smooth and continuous surface with high processing precision. It has been desired to develop an apparatus for generating the inner circumferential surface of a workpiece having an oval cross-sectional shape, which is simple in structure and inexpensive.

Therefore, the main purpose of the present invention is to achieve high processing accuracy and
An object of the present invention is to obtain a generating processing device for the inner circumferential surface of a workpiece having an oval cross-sectional shape, which has a simple configuration and can be provided at low cost.

In order to achieve the above object, the present invention provides a surface plate having a flat work surface, a cutter tool disposed so as to be rotatably driven around an axis perpendicular to the work surface, and the cutter tool. a plurality of internal gears fixed to the surface plate around the rotational axis of the work surface along a plane parallel to the working surface and spaced apart from each other, each having an equal pitch circle diameter, and the internal gears; A plurality of planetary gears each having an equal pitch circle diameter and having half the number of teeth of each of the internal gears and meshing with the internal gears, and each of the planetary gears being synchronized with the rotation of the cutter tool. a synchronization mechanism for causing the planetary gears to revolve; and a sliding contact that is connected to the plurality of planetary gears so as to be relatively rotatable through a plurality of eccentric pins that are offset from their rotation centers, respectively, and that can slide on the work surface of the surface plate. the plurality of eccentric pins are set to have the same offset direction and offset amount from the rotation center of the corresponding planetary gear so that the plurality of eccentric pins move in the same phase when each of the planetary gears revolves; The sliding base plate is provided with mounting means to which a workpiece whose inner peripheral surface is to be processed by the cutter tool can be mounted.

An embodiment of the present invention will be described below with reference to the drawings.

First, in Fig. 1, the surface plate 1 includes this surface plate 1.
A spindle through hole 2 and a pair of crankshaft support holes 3 and 4 are formed in a direction perpendicular to the flat working surface 1a of the
is formed. Inside the spindle through hole 2, the spindle case 5 is supported by a support device (not shown) so that it can reciprocate in a direction perpendicular to the working surface 1a of the surface plate 1. A spindle 8 is rotatably supported inside the spindle case 5 via a pair of bearings 6 and 7 about an axis perpendicular to the working surface of the surface plate 1.

A tool insertion hole 9 is formed on the tip side of the spindle 8, and a root portion 11 of a cutter tool 10 having a single-edged cutter blade 12 on the outer periphery is inserted into the tool insertion hole 9. It is fixed by a set screw 13. This cutter tool 10 is replaceable, and tools for grinding, polishing, honing, etc. can be selectively employed and installed as required.

A spline 14 is formed on the outer peripheral surface of the spindle 8 between the pair of bearings 6 and 7, and the inner peripheral surface side of a drive gear 15 having a sufficient width in the axial direction is spline-coupled to this spline 14. There is. The spindle 8 and the drive gear 15 are
It can reciprocate in the axial direction together with the spindle case 5, and is connected to the base end side of the spindle 8 by a rotation drive device (not shown).
The spindle 8 is configured to be rotated around the axis of the spindle 8 relative to the spindle case 5 .

On the opposite side of the work surface 1a of the surface plate 1, a pair of gear support shafts 16 are provided at positions facing each other in the diametrical direction of the spindle 8 with the spindle 8 in between.
16' are arranged, and each of these gear support shafts 1
Intermediate gears 17 and 17' as idle gears having the same number of teeth and meshing with the drive gear 15 are pivotally supported on the intermediate gears 6 and 16', respectively.

In each crankshaft support hole 3, 4, a crankshaft 20, 20' is supported via a pair of bearings 18, 19 and 18', 19', respectively. Rotation adjustment gears 21 and 21' as timing gears spline-coupled to splines 22 and 22' formed on the outer peripheral surface of the base end are connected to corresponding intermediate gears 17 and 21', respectively, as timing gears.
It meshes with 17'. Each rotation adjustment gear 21,
21' have the same number of teeth, and
The number of teeth of each of these rotation adjustment gears 21, 21' also matches the number of teeth of the drive gear 15. Therefore, the spindle 8 is rotationally driven and the drive gear 15
During one rotation of the drive gear 15, each rotation adjustment gear 21, 21' also rotates once in the same direction as the drive gear 15 in synchronization with the rotation of the drive gear 15.

On the work surface 1a side of the surface plate 1, concave portions 23 and 23' are provided concentrically with the crankshaft support holes 3 and 4, respectively.
are formed, and each of these concave portions 23, 23'
Inside, the tips of crank arms 24, 24' formed at the tips of each crankshaft 20, 20' are provided with gear support shafts 25, 25', respectively.
An internal gear 2 formed on the side peripheral surface of each concave portion 23, 23' along a plane parallel to the working surface 1a of the surface plate 1.
Planetary gears 27, 27' meshing with 6 are pivotally supported.

The number of teeth of each internal gear 26, 26' is equal to each other,
Further, the number of teeth of each planetary gear 27, 27' is 1/2 that of each internal gear 26, 26', and
7 and 27' are meshed with corresponding internal gears 26 and 26' so as to revolve in the same phase around the corresponding crankshafts 20 and 20'. Each of the planetary gears 27, 27' has the same structure, for example, as shown in FIG. 2, the shaft hole 28,
Around the shaft hole 28', there are a plurality of pin insertion holes 29, 30, 31, 32 and 29', for example, four pin insertion holes having different offset amounts from the center of the shaft holes 28, 28'.
30', 31', and 32'.

The corresponding pin insertion holes of the planetary gears 27 and 27', for example, the pin insertion holes 29 and 29', are provided with pin insertion holes of the sliding base plate 33 that can freely slide on the working surface 1a of the surface plate 1. One end side of pins 35, 35' as eccentric pins inserted into 34, 34' is inserted. The sliding base plate 33 has an opening 36 for preventing interference with the spindle 8 during sliding movement on the work surface 1a of the surface plate 1, and has a hole 36 for preventing interference with the spindle 8, and allows each planetary gear 27,
27', it slides on the work surface 1a of the surface plate 1 while maintaining a constant directionality without rotating while receiving driving force from each planetary gear.

A workpiece W having a workpiece surface 39 on the inner periphery is fixed on the sliding base plate 33 by a fixing bolt 37 and a positioning pin 38 as attachment means, and the crankshaft A planetary gear 27 driven by the other crankshaft 2
0', the pin 35 is also closest to the other crankshaft 20', and the pin 35 is closest to the other crankshaft 20'.
0, the respective axes of the planetary gear 27 and the pin 35 are arranged on the same plane, and the planetary gear 27' and the pin 35', which are driven by the crankshaft 20' at the same time, are the most distant from the other crankshaft 20, The crankshaft 20' has a planetary gear 27' and a pin 35'.
The axes of the cutter blade 12 are aligned on the same plane, and the direction in which the cutter blade 12 protrudes from the tool 10 is parallel to the plane containing the axes of the crankshaft 20, the planetary gear 27, and the pin 35. In this state, the cutter blade 12 is adjusted so as to come into contact with the workpiece surface 39 of the workpiece W.

Since the illustrated embodiment is configured as described above, when the spindle 8 is rotationally driven, the drive gear 15, each intermediate gear 17, 17', each rotation adjustment gear 21, 21', and each crankshaft 20 , 20', each planetary gear 27, 27' is rotationally driven. At this time, as shown in FIG. 3, the length of the diameter of the pitch circle 27a of the planetary gear 27 is 1/2 of the diameter of the pitch circle 26a of the internal gear 26,
As the planetary gear 27 revolves around the axis O of the crankshaft 20 along the locus circle 25a of the axis of the gear support shaft 25, the axis of the pin 35 draws an elliptical locus 35a. . As is obvious from the geometry,
The radius of the long axis of the elliptical locus 35a is the length l of the longer line segment when the diameter of the pitch circle 27a of the planetary gear 27 passing through the axis of the pin 35 is divided into two by the axis of the pin 35. , and the radius of the short axis is the pitch circle 27a of the planetary gear 27 passing through the axis of the pin 35.
is equal to the length m of the shorter line segment when the diameter of the pin 35 is divided into two by the axis of the pin 35.

Since the planetary gear 27' also rotates while maintaining the same phase as the planetary gear 27, the pin 35' is arranged so that its axial center draws an elliptical locus congruent with the elliptical locus 35a of the axis of the pin 35. , move while maintaining the same phase as the pin 35. As a result, the sliding substrate 33 and the workpiece W fixed to the sliding substrate 33 move along an elliptical trajectory congruent with the elliptical trajectory 35a while maintaining a constant directionality without rotational movement. exercise along. This means that, as shown in FIG. 4, the axis of the spindle 8 draws an elliptical locus 8a relatively congruent with the elliptical locus 35a along the processed surface 39 of the workpiece W. It corresponds to that. and,
The rotation of the spindle 8 and therefore the cutter blade 12
The rotation of is synchronized with the revolution of each planetary gear 27, 27', and the workpiece W driven by these planetary gears 27, 27' moves in one period along its elliptical motion locus. During this time, the cutter blade 12 rotates exactly once in synchronization with the movement of the workpiece W.
As shown in FIG. 4, while the axis of the spindle 8 moves on an elliptical locus 8a relative to the workpiece W, the direction of the cutter blade 12 is indicated by the arrow 12.
It changes periodically like a. As a result, on the workpiece 39, where r is the distance from the axis of the spindle 8 to the sharp cutting edge of the cutter blade 12, an elliptical cross section with a major axis radius of l+r and a minor axis radius of m+r is formed. A smooth continuous circumferential surface with a shape is created. In this way, by moving the spindle 8 together with the spindle case 5 in the axial direction, it is possible to process the entire surface 39 of the workpiece W.

Also, the pin insertion hole 29 of each planetary gear 27, 27',
30, 31, 32 and 29', 30', 31', 3
By arbitrarily selecting pins 2' and inserting the pins 35, 35', it is possible to obtain elliptical trajectories of the workpiece W having different major and minor axes.

In the above embodiment, the drive gear 15,
Each intermediate gear 17, 17', each rotation adjustment gear 21,
21', each crankshaft 20, 20' and each gear support shaft 25, 25' cooperate with each other to support each planetary gear 2.
7, 27' revolve in synchronization with the rotation of the cutter tool 10, forming a synchronizing mechanism I, I' of the present invention.

Note that the synchronous control of the planetary gears 27, 27' may be performed by any other arbitrary means other than the one shown in the drawings, such as electrical control.

As described above, according to the present invention, a surface plate having a flat work surface, a cutter tool disposed so as to be rotationally driven around an axis perpendicular to the work surface,
A plurality of internal gears are fixed to the surface plate around the rotational axis of the cutter tool along a plane parallel to the work surface and spaced apart from each other, and each have an equal pitch diameter. A plurality of planetary gears having half the number of teeth of each of the internal gears and meshing with the internal gears, each having the same pitch circle diameter, and each of the planetary gears being connected to the rotation of the cutter tool. A synchronizing mechanism for synchronously revolving, and a plurality of planetary gears connected to each other so as to be relatively rotatable via a plurality of eccentric pins offset from their respective rotation centers, and sliding on the work surface of the surface plate. The plurality of eccentric pins have the same offset direction and offset amount from the rotation center of the corresponding planetary gear so that they move in the same phase when each of the planetary gears revolves. The sliding base plate is provided with a mounting means to which a workpiece whose inner peripheral surface is to be machined by the cutter tool can be mounted, so that when the cutter tool rotates, the cutter tool rotates due to engagement with the internal gear. Meanwhile, the eccentric pin on the planetary gear, which revolves in synchronization with the rotation of the cutter tool, causes the workpiece on the sliding contact substrate to move in parallel along an elliptical trajectory of the eccentric pin. Therefore, by simply rotating the cutter tool, a cylindrical inner circumferential surface having a smooth and continuous oval cross-sectional shape can be created with high processing accuracy. Moreover, the device of the present invention has a relatively simple structure that combines the planetary gear mechanism and the synchronization mechanism as described above, and can be provided at a relatively low cost.
Its control is also easy.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a main part of a generating processing device for the inner peripheral surface of a workpiece having an oval cross-sectional shape based on an embodiment of the present invention, and FIG. 2 is a planetary planet used in the device shown in FIG. FIG. 3 is a plan view showing an example of a gear; FIG. 3 is a diagram for explaining the motion locus of the planetary gear and the pin inserted into the pin insertion hole of the planetary gear in the device shown in FIG. 1; FIG. FIG. 3 is a diagram for explaining the relative movement locus of a spindle and a cutter blade with respect to a workpiece in the apparatus shown in the figure. 1...Surface plate, 10...Cutter tool, 26,2
6'... Internal gear, 27, 27'... Planetary gear, 3
3... Sliding board, 35, 35'... Pin as eccentric pin, 37, 38... Fixing bolt as mounting means, positioning pin, I, I'... Synchronous mechanism, W
...Workpiece.

Claims (1)

[Claims] 1. A surface plate 1 having a flat work surface 1a, a cutter tool 10 disposed so as to be rotatably driven around an axis perpendicular to the work surface 1a, and a cutter tool 10 disposed around the rotation axis of the cutter tool 10. 1, a plurality of internal gears 26, 26' fixedly installed along a plane parallel to the working surface 1a and spaced apart from each other, each having the same pitch circle diameter, and the internal gears 26, 26. A plurality of planetary gears 27, 2 having the same number of teeth and having the same pitch circle diameter and meshing with the internal gears 26, 26', respectively.
7', a synchronizing mechanism I, I' that rotates each of the planetary gears 27, 27' in synchronization with the rotation of the cutter tool 10, and a synchronizing mechanism I, I' that rotates each of the planetary gears 27, 27' with an offset from each rotation center of the plurality of planetary gears 27, 27'. The plurality of eccentric pins 35 are connected to each other so as to be relatively rotatable through a plurality of eccentric pins 35 and 35', and are capable of sliding on the working surface 1a of the surface plate 1. , 35' are set to have the same offset direction and offset amount from the rotation center of the corresponding planetary gears 27, 27' so that they move in the same phase when the planetary gears 27, 27' revolve, Attachment means 37 and 38 are provided on the sliding base plate 35 to which a workpiece W whose inner peripheral surface is to be processed by the cutter tool 10 can be attached.
1. A generating processing device for creating an inner peripheral surface of a workpiece having an oval cross-sectional shape.