JPH045236Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a workpiece support device for an internal grinder.

(Prior Art) Regarding internal grinders, a technique is generally known in which a workpiece is supported by a two-roller, one-shoe system (see, for example, Japanese Utility Model Publication No. 18692/1983). In other words, in this support method, the workpiece is supported by sandwiching it from three sides with two rollers and one shoe.
The workpiece is rotated by rotating the rollers at the same circumferential speed, and the inner surface of the workpiece is ground with a grinding stone.

The above-mentioned support method can support the workpiece in a relatively stable state when the outer diameter of the workpiece is the same over the entire length, and enables highly accurate internal grinding. However, in the case of a so-called stepped workpiece with a large-diameter part and a small-diameter part, that is, a change in outer diameter, even if the large-diameter part is supported by the 2-roller/1-shoe system, the unsupported small-diameter part If run-out occurs in the rotation of the workpiece, and if one roller has a small diameter part and a large diameter part to support both the large diameter part and the small diameter part of the workpiece, the peripheral speed will increase on the large diameter side and the small diameter side. Because of the difference, slips occur between the roller and the workpiece, creating extra resistance and causing the roller or workpiece to rotate out of order.

(Purpose of the invention) This invention is an attempt to solve the problem that with the conventional two-roller/one-shoe support system, when working with stepped workpieces, the rotation of the rollers and workpiece becomes out of order, resulting in lower machining accuracy. .

(Structure of the invention) In the workpiece support device for an internal grinder of the invention, in the support system of 2 rollers and 1 shoe, 2
At least one of the rollers includes a drive roller portion that rotates integrally with a rotating shaft that rotates the roller;
and a free roller portion that is allowed to rotate relative to the rotation shaft. The axis of the rotating shaft is set parallel to the axis of the workpiece. The drive roller portion and the free roller portion contact portions of the workpiece having different outer diameters, and the outer diameters of both roller portions are different from each other of the portions of the workpiece that they contact. The sizes of the outer diameters are set to be opposite to each other and are set to differ by the difference in the outer diameters of the two portions of the workpiece.

In the case of the present invention, for a stepped workpiece having a plurality of different outer diameters, different diameter portions are supported by the drive roller section and the free roller section, and the rotation of the drive roller section is transmitted to the workpiece. The free roller section rotates separately from the rotating shaft following the rotation of the rotary shaft.

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

In the workpiece support device for an internal grinding machine shown in FIG. It is supported so that it can swing up and down. A pair of rollers 4 and 5 are provided at the tips of the fixed base 1 and the movable base 2, and a shoe 6 is fixed to the fixed base 1. A stepped workpiece 7 having a portion 7a and a small diameter portion 7b is supported from three sides, and in this example, the lower roller 4 includes a drive roller portion 4a and a free roller portion 4b, which will be described later.

First, to explain the swing mechanism of the movable base 2, a balance weight 8 is fixed to the base end of the movable base 2, and an upper roller 5 and a lower roller There is a pressurizing cylinder 9 that swings toward 4, and an unloading cylinder 10 that swings in the opposite direction.

Next, to explain the drive mechanism for the rollers 4 and 5, an electric motor 11 is disposed on the back of the movable base 2, and as shown in FIG.
Drive pulley 12 of , driven pulley 1 of rollers 4 and 5
3, 14 and the intermediate pulley 15 with a transmission belt 16
is suspended so that rotation is transmitted to the driven pulleys 13 and 14 in synchronization. In addition, the fixed base 1 and the rotary base 2 each have the above-mentioned driven pulley 1.
3, 14 and rollers 4, 5 as shown in FIG.
Clamp devices 19, 2 which form connections with 7, 18
0, unclamp cylinder 21 to release the connection,
22 and levers 23, 24 are provided.

To explain the supply and take-out route of the workpiece 7, an injector 25 for feeding the workpiece 7 onto the shoe 6 is attached to the fixed base 1, and the workpiece 7 on the shoe 6 is moved between the two rollers 4, 5. Pusher 2 is supplied to the support position by Shue 6.
6 is provided so as to be movable forward and backward on the shoe 6 by means of a pusher cylinder 27. Further, a bucking plate 28 is provided at the back of the support position, and an outshooter 29 for taking out the ground workpiece 7 from the front of the lower roller 4 extends forward. A rod 31 having a dog 30 on its back protrudes from the pusher cylinder 27, and the pusher 26 is controlled by the dog 30 and the front and rear proximity switches 32, 33.
It is now possible to detect

Then, as shown in FIG. 3, the drive roller portion 4a of the lower roller 4 is coupled to the rotating shaft 17,
The free roller portion 4b is configured to rotate integrally with the rotating shaft 17, and the free roller portion 4b is provided with a bearing (ball bearing) 34 on the outer periphery of the base of the drive roller portion 4a so as to be relatively rotatable, that is, relative to the rotating shaft 17. It is rotatably supported. In this example, corresponding to the step (diameter difference) between the large diameter portion 7a and the small diameter portion 7b of the workpiece 7, the free roller portion 4b is larger than the drive roller portion 4a. ), and the drive roller part 4a is formed to have a large diameter part 7a of the workpiece 7, and the free roller part 4b
are adapted to support the small diameter portion 7b, respectively. Note that the rotating shaft 17 is supported by a bearing body 35 of the fixed base 1 via a main bearing 36.

On the other hand, the upper roller 5 is a single roller having only a bearing body 37 coupled to the supporting rotating shaft 18, and the outer diameter is the same as that of the driving roller portion 4a of the lower roller 4. The workpiece 7 is located at an intermediate position between the drive roller section 4a and the free roller section 4b.
It is adapted to come into contact with the large diameter portion 7a of.

For internal grinding of the workpiece 7, the pusher 26 pushes the workpiece 7 to the support position with the upper roller 5 raised, and the workpiece 7 is moved between the two rollers 4, 5 and 7 by lowering the upper roller 5. Supported by Show 6. Then, the rotation of the electric motor 11 is controlled by the rotating shaft 17,
18 through a transmission belt 16, the workpiece 7 is rotated by the two rollers 4 and 5, and a tool 39 equipped with a grindstone 38 is used to grind the large diameter portion 7a of the workpiece 7 as shown in FIG. Perform internal grinding.

In the case of this example, the drive roller section 4a of the lower roller 4 and the upper roller 5 rotate at the same circumferential speed, so that the workpiece 7 rotates, and the free roller section 4b rotates the workpiece 7.
rotation is transmitted from the small diameter portion 7b and rotates at a different circumferential speed from that of the drive roller portion 4a. In other words, there is no slippage between the free roller portion 4b and the workpiece 7, and the workpiece 7 rotates at a stable speed.

Further, in this example, since the large diameter portion 7a to be internally ground is supported by the drive roller portion 4a, the rotational force is directly and actively transmitted to the large diameter portion 7a, and the grinding surface is This prevents uneven rotation. In other words, the rotation of the drive roller section may be directly transmitted to the small diameter section 7b that is not ground, but in that case, the large diameter section 7a that is ground has some extra resistance to rotate the free roller section. However, this does not occur in the above embodiment.

Moreover, since the workpiece 7 is supported between the two rollers 4 and 5 at three points: the drive roller part 4a and the free roller part 4b of the upper roller 5 and lower roller 4, the parallelism between each roller is This also makes it easier to absorb deviations in the diameter of the workpiece 7 and variations in the dimensional difference between the large-diameter portion 7a and the small-diameter portion 7b of the workpiece 7. Furthermore, since the drive roller section 4a and the free roller section 4b are provided on the fixed base 1 side,
Compared to the case where it is provided on the movable table 2 side, the contact position with respect to the workpiece 7 can be made more accurate, and the stability of the support of the workpiece 7 is also improved. Of course, the drive roller section and the free roller section may be provided on the movable base 2 side, or furthermore, may be provided on both the fixed base 1 side and the movable base 2 side.

Note that the workpiece 7 in the above embodiment has a large diameter portion 7a and a small diameter portion 7b, but the present invention is applicable to a workpiece having three different diameter portions, large, medium and small, or a workpiece having multiple large diameter portions or multiple small diameter portions. The present invention can also be applied to supporting a workpiece having a section, and even in that case, it is preferable to apply the driving roller section to the diameter section to be internally ground and the free roller section to the other diameter section.

Further, as a member for rotatably supporting the free roller portion, in addition to a rolling bearing such as a ball bearing, a sliding bearing or the like may be used.

(Effects of the invention) According to the invention, it is possible to stably support a workpiece that has parts with different outside diameters without causing runout, slipping between the roller and the workpiece, or excessive frictional resistance. It is possible to transmit rotational force, prevent uneven rotation, and improve the accuracy of internal grinding.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is a perspective view of a workpiece support device, Fig. 2 is a configuration diagram of a 2-roller/1-shoe support system, and Fig. 3 is a cross section taken along line A-A in Fig. 2. It is a diagram. 1...Fixed base, 2...Movable base, 4...Lower roller, 4a...Drive roller section, 4b...Free roller section, 5...Upper roller, 6...Show, 7...Workpiece, 7a ...Large diameter part, 7b...Small diameter part, 17,
18... Rotating shaft, 34... Bearing.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a workpiece support device for an internal grinding machine that supports workpieces having a plurality of different outer diameters using a two-roller/one-shu support system and performs internal grinding,
At least one of the rollers includes a drive roller portion that rotates integrally with a roller rotation shaft whose axis is parallel to the axis of the workpiece, and a drive roller portion of the workpiece that is supported so as to be rotatable relative to the roller rotation shaft. A free roller portion that abuts a portion having an outer diameter different from the abutting portion is provided, and the outer diameter of the drive roller portion and the outer diameter of the free roller portion are:
The sizes of the outer diameters of the respective parts of the workpiece that each abuts are set to have an opposite size relationship with each other, and to differ by the difference in the outer diameter of both parts of the workpiece. Features: Workpiece support device for internal grinding machines. (2) The rotation axis of one of the two rollers is fixed in position, and the rotation axis of the other roller is provided so as to be movable toward and away from the rotation axis of the one roller, and the rotation axis of the other roller is movable toward and away from the rotation axis of the one roller. A workpiece support device for an internal grinding machine according to claim 1, wherein the roller on the side whose position is fixed includes a drive roller portion and a free roller portion.