JPH0230825B2 - ENKOJOBOORUTENDOMIZOKAKOSOCHI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for machining arcuate ball rolling grooves on the spherical circumferential surface of a workpiece such as the outer race of a constant velocity ball joint.

[Prior Art] Conventionally, in a processing device (hereinafter also simply referred to as a processing device) for processing an arcuate ball rolling groove on a spherical circumferential surface of a workpiece such as an outer race of a constant velocity ball joint, the following method is used. Similar processing methods are used.

That is, a workpiece having a spherical circumferential surface with an opening is held on this swinging holding table and is caused to swing. Note that this rocking motion is performed while keeping the center of the spherical inner peripheral surface stationary. Then, a rotary tool with a spherical tip that can move forward and backward along the axis is inserted into the opening of the workpiece, and an arc-shaped ball rolling groove is machined on the spherical circumferential surface of the workpiece by the above-mentioned rocking motion. ing.

In such a processing device, the swinging holding table must be swinged over the ball rolling groove forming angle range with respect to the axis of the rotary tool. Generally, in order to increase the stability of the rocking motion, the rocking angle range θ is defined by tilting axes Q1 and Q2 distributed on both sides of the vertical axis Q3 as shown in FIG.
determined between.

Incidentally, as the swinging mechanism for swinging the swinging holding table, a crank mechanism that can obtain a smooth sine motion and increase the swinging speed is suitable.
This crank mechanism is constructed by pivotally supporting the driving end of a connecting rod at an eccentric position on the end face of the rotating shaft, and by pivotally supporting the working end of the connecting rod at an eccentric position of a swinging holder.
Therefore, in this crank mechanism, the driving end of the connecting rod revolves around the axis of the rotating shaft due to the rotation of the rotating shaft, and as a result, the working end of the connecting rod moves the swinging holder to its axis (swinging). (center of motion) can be oscillated at regular intervals.

[Problems to be Solved by the Invention] However, although the above-described crank mechanism as a swinging mechanism has the advantage of providing smooth sine motion and increasing the swinging speed, it has the following problems.

That is, since the gripping portion of a workpiece such as the outer race of a constant velocity ball joint is short due to its shape, it is desirable to load or unload the workpiece in the vertical direction in order to improve posture stability or loading speed. When loading or unloading a workpiece in the vertical direction, it is necessary to position the swinging holding table that holds the workpiece at a proper position within the swinging angle range θ.

More specifically, in order to load or unload a workpiece in the vertical direction while gripping the gripping portion of the workpiece, the static posture of the swinging holding table must match the posture of the incoming workpiece. .

However, in the crank mechanism type swing mechanism as described above, it is difficult to quickly stop the swing holding table at a fixed position within the swing angle range θ.

That is, since the swinging holder is fixed to the rotating shaft via the connecting rod, in order to stop the swinging holder in a fixed position, the rotating shaft must be stopped at a predetermined angular position. Since there is a large inertial swing load such as the swing holding table, workpiece, and connecting rod, it is extremely difficult to quickly stop the rotating shaft at a predetermined angular position.

In view of this, the present invention has an object to be solved: to smoothly and quickly vertically position a swinging holding table that is swinged by a crank mechanism, and to shorten the time required to attach and detach a workpiece.

[Means for Solving the Problems] In order to solve the above problems, an apparatus of the present invention includes a bed and a rotary tool for machining arcuate ball rolling grooves on a workpiece, and is provided so as to be movable forward and backward on the bed. a tool stand, a swinging holder pivotably supported on the bed to hold a workpiece in a swinging plane orthogonal to the advance/retreat direction, and an eccentric position of a rotating shaft supported by the bed; a crank mechanism connected to an eccentric position of the swinging holder to swing the swinging holder in a predetermined angle range by rotation of the rotating shaft, the crank mechanism being connected to an eccentric position of the rotating shaft; a crankshaft provided in the rotating shaft portion so as to be eccentric by a predetermined eccentric distance from the center and parallel to the axis; and a crankshaft eccentric from the axis of the crankshaft by the same distance as the eccentric distance and parallel to the axis a crank pin provided on the crankshaft parallel to the crankshaft; a crankshaft rotation means provided on the rotational shaft for rotating the crankshaft with respect to the rotational shaft; and a crankshaft rotation means provided on the rotational shaft. a stopper that comes into contact with a projecting piece of the crankshaft when the axis of the crank pin is aligned with the axis of the rotating shaft; A connecting rod is provided, one end of which is pivotally connected to the crank pin and the other end of which is pivotally connected to an eccentric position of the swing holder so that the swing holder is in a vertical position. There is.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

2 to 5, a slide base 4 is placed on a fixed base 3 of the bed 2, and a tool stand 6 is slidably guided by its inclined guide surface 5. The piston 8 of the rapid feed cylinder 7 formed on the slide base 4 is connected to a bracket 1 protruding from the lower surface of the tool stand 6 via a piston rod 9.
Connected to 0.

Inside the tool stand 6, a ram 12 is provided with a spindle unit 11 having a rotational drive source and a rotary tool 1 inserted at its tip that is rotatable around an axis parallel to the inclined guide surface 5. The ram 12 is prevented from rotating relative to the tool stand 6, and the rear part thereof is fitted with a compensator 13.
is connected to. The slide base 4 is connected via a nut 17 to a feed screw 16 which is connected via a reduction gear 15 to a cutting servo motor 14 fixed to an end of the fixed base 3. Therefore, the slide base 4 can be slid on the fixed base 3 in the left-right direction (in FIG. 3) by the operation of the motor 14. Further, on the bed 2, a pair of supporting shafts 19 disposed at both ends of a swing holding table 18 for holding the workpiece W are rotatably supported around an axis perpendicular to the axis of the rotary tool 1. A bearing stand 20 is fixed.

A work W (not shown) is mounted on the swing holding table 18.
A workpiece holding table 21 is attached which includes a clamp mechanism and an indexing mechanism for indexing and rotating the workpiece W around the workpiece axis, and the center of the spherical surface of the bowl-shaped portion of the workpiece W coincides with the centerline of the support shaft 19. It is set up like this.

A rotary motor 2 fixed inside the bed 2
The bearing sleeve 2 is connected to the bearing sleeve 2 via the reducer 23.
4. A rotating face plate 27 is integrally formed on a rotating shaft 26 which is rotatably supported by a bearing 25 for forward and reverse rotation. A crank mechanism 28 is installed on the rotating face plate 27. A crankshaft 29 of the crank mechanism 28 is supported by the rotating face plate 27 via a bearing 30 so as to be able to rotate eccentrically with respect to the axis of the rotating shaft 26.

A crank pin 31 is installed on the end surface of the crankshaft 29 so as to be eccentric from the axis of the crankshaft 29 by the same amount as the eccentricity of the crankshaft 29 with respect to the axis of the rotating shaft 26.
9 rotates the crank pin 31 to the rotating shaft 26.
It moves along a circular trajectory passing through the axis of .

The crank pin 31 is rotated by the meshing action between a rack 34 formed on the extension of the piston 33 in the crankshaft rotation cylinder 32 in conjunction with the crankshaft 29, and a pinion 35 formed on the crankshaft 29. Displaced. The positioning of the crank pin 31 is achieved by bringing the projection 29a of the crankshaft 29 into contact with a stopper 36 or 37 fixed to the rotating face plate 27, thereby moving the rotating shaft 26 to a predetermined radial position A, that is, the work W as shown in FIG. Predetermined angle θ
and a position where the axis center position B of the rotary shaft 26, that is, a position where the workpiece W is placed in a vertical state within the swing range of the θ angle.

A connecting rod 39 has one end pivotally connected to the crank pin 31, and the other end of which is pivotally connected to a pin 38 (FIG. 3), which is provided eccentrically to the support shaft 19 of the swing holder 18. The rotational movement of the crankshaft 29 is transmitted by the connecting rod 39 to cause the swinging holding table 18 to swing around the support shaft 19.

Note that the rotating shaft section is composed of a rotating shaft 26 and a rotating face plate 27. The crankshaft rotation means is composed of a crankshaft rotation cylinder 32, a piston 33, a rack 34, and a pinion 35.

Next, the effect will be explained.

As shown by the solid line in FIGS. 4 and 5, the state in which the axial center of the crank pin 31 of the crankshaft 29 is at the shaft center position B of the rotating shaft 26 indicates the workpiece attachment/detachment state, and in this state, the The holding table 18 is in a vertical state, that is, the axis of the workpiece W is vertical, and the workpiece W is loaded or unloaded by a loading or unloading device (not shown).

When the loading of the unprocessed workpiece is completed, the workpiece W is clamped and held on the workpiece holding table 21. Therefore, during machining, the piston 33 of the rotating cylinder 32
By raising the crankshaft 29, the crankshaft 29 is rotated relative to the rotating shaft 26 until the protruding piece 29a abuts the lower stopper 37, and the crank pin 3
1 eccentrically with respect to the rotating shaft 26, a two-dot chain line position A
Displace it to. Thereafter, the rotary motor 22 is started and the rotary shaft 26 is rotated. The rotation of the rotating face plate 27 causes the rotation of the crankshaft 29 and the crank pin 31 to move the connecting rod 39 to the rightmost position A ₁ in FIG.
It is reciprocated within the range of the leftmost position _A2 , and this movement is transmitted to the swinging holder 18 via the pin 38, so that the swinging holder 18 swings. Accordingly, the workpiece W held on the swinging holding table 18 is Q ₁ in FIG.
Swings between a predetermined angle θ between _Q2 . In this state, the tool stand 6 is advanced rapidly, and then the servo motor 14 intermittently applies predetermined cuts to the rotary tool 1 to machine the ball rolling groove Wa.

When one groove machining is completed, the rotary tool 1 is released to a position where it does not interfere with the indexing of the workpiece W, and the clamping mechanism and indexing mechanism of the workpiece holder 18 are activated to divide the workpiece W into the next phase to be machined. The rotary tool 1 is machined by applying a cutting motion to the rotary tool 1 while making an oscillating motion. When all groove machining is completed, the tool stand 6 is returned to the current position, the rotation motor 22 is stopped, and the operation of the crank mechanism 28 is stopped.

In this case, the crank pin 31 will stop at an arbitrary phase, and the workpiece W on the swing holding table 18 will also stop at an arbitrary angular position within the range of the swing angle θ.

Next, when the piston 33 in the cylinder 32 is lowered and the crankshaft 29 is rotated until the projection 29a abuts the upper stopper 36, the crank pin 31
returns to the axial center position B, and the swing holding table 18 is again positioned in the vertical position. In this state, the workpiece is loaded or unloaded again, and the lowering state is repeated in the same manner as above.

Next, a second embodiment of the crank mechanism of the first embodiment will be described with reference to FIGS. 6 and 7. (The same components as in the first embodiment are given the same reference numerals.) A crank piece 51, which is a crank member of a crank mechanism 50, is attached to a rotating face plate 27 of a rotating shaft 26, and a supporting shaft 52 is attached to a position eccentric from the rotating shaft 26 by a predetermined amount. It is rotatably supported by.

A crank pin 53 connected to the connecting rod 39 is fixed to the crank piece 51 at a position eccentric by the same amount as the eccentric amount. The crank pin 53
The rotating cylinder 32 is linked with the crank piece 51.
Piston rod 5 of piston 33 that moves up and down within
The support shaft 52 is connected via the engagement shaft 55 that engages with the end of the
Rotate and displace using the fulcrum as a fulcrum.

The movement of the crank piece 51 is caused by contacting the upper and lower stoppers 56 and 57 fixed to the rotating face plate 27, so that the crank pin 53 moves between the predetermined radial position A of the rotating shaft 26 and the shaft, as in the first embodiment. It is positioned at center position B. The crank piece 51 has a guide member 58 fixed to the rotating face plate 27.
is guided by the groove 58a.

The operation of the crank mechanism 50 of this second embodiment is similar to that of the first embodiment, and the crank pin 53
If the position is the axis center position B, the swing holding table 18
is in a vertical state, and in the case of the radial position A, it swings within the range of angle θ.

[Effects of the Invention] As described above, the device of the present invention has the following features: (a) A crank having a projecting piece provided on the rotating shaft portion so as to be eccentric by a predetermined eccentric distance from the axis of the rotating shaft portion and parallel to the axis. (b) A crank pin that is eccentric from the axis of the crankshaft by an eccentric distance and protrudes from the crankshaft so as to be parallel to the axis; (c) A crank pin that is disposed on the rotating shaft and that rotates the crankshaft. (d) a crankshaft rotating means for rotating the shaft relative to the shaft, and (d) a crank pin disposed on the rotary shaft that collides with a projecting piece of the crankshaft when the axis of the crank pin is aligned with the shaft center of the rotary shaft. (e) One end is pivotally connected to the crank pin, and the other end is pivotally connected to the crank pin so that the swing holding stand is in a vertical position when the axis of the crank pin is aligned with the axis of the rotating shaft. It is characterized by comprising a connecting rod pivotally mounted at an eccentric position of the swinging holding table.

Therefore, by bringing the projecting piece of the crankshaft into contact with the stopper on the rotating shaft side at any stopping angle of the rotating shaft part, the attitude of the swinging holding table can be maintained in a vertical state, that is, it can be loaded in the vertical direction. Alternatively, it can be positioned in a static position suitable for holding the workpiece to be unloaded.

Naturally, this positioning is unrelated to the rotational state of the rotating shaft, so there is no need to rotate the stationary rotating shaft, and it can be performed even while the rotating shaft is rotating.

As a result, the swinging holding table can be quickly positioned vertically while reducing the swing radius from fast swinging motion for loading and unloading the workpiece, reducing the time required for loading or unloading, and By loading or unloading the workpiece, it is possible to stably and reliably load and unload the workpiece.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a partial sectional view showing the relationship between a rotating tool and a workpiece, and FIG.
The figure is a partial vertical sectional view of the processing device of the first embodiment, and
The figure is a cross-sectional view taken along the - line in Figure 2, and Figure 4 is a cross-sectional view of Figure 3.
5 is a sectional view taken along the - line in FIG. 4, FIG. 6 is a detailed view of the crank mechanism of the second embodiment, and FIG. 7 is a detailed view shown in FIG. FIG. 1... Rotating tool, 6... Tool stand, 18... Swinging holding stand, 21... Work holding stand, 36, 37, 5
6,57... Stoppa, 39... Connecting rod, 28,
50... Crank mechanism, 29, 51... Crank member, 31, 53... Crank pin, 22... Rotating motor, 32... Rotating cylinder.

Claims (1)

[Scope of Claims] 1. A bed, a tool stand provided with a rotary tool for machining an arcuate ball rolling groove in a workpiece and movable forward and backward on the bed; A swinging holder that is movably supported and holds a workpiece, and an eccentric position of a rotating shaft supported by the bed and an eccentric position of the swinging holder are connected to each other, and the rotating shaft is rotated. a crank mechanism for swinging the swinging holding table in a predetermined angle range, the crank mechanism being eccentric by a predetermined eccentric distance from the axis of the rotating shaft portion so as to be parallel to the axis; a crankshaft provided on the rotating shaft portion; a crank pin eccentrically located from the axis of the crankshaft by a distance equal to the eccentric distance and provided on the crankshaft parallel to the axis; and on the rotating shaft portion. The crankshaft is arranged such that the crank pin rotates the crankshaft relative to the rotating shaft between an angular position where the crank pin coincides with the axial center position of the rotating shaft and an angular position eccentric from the axial center position. moving means; one end is pivotally connected to the crank pin, and the other end is pivotally connected to the crank pin so that the swing holding table is in a vertical position when the axis of the crank pin is aligned with the axis of the rotating shaft portion; An arcuate ball rolling groove machining device comprising: a connecting rod pivotally mounted at an eccentric position of the swing holding table.