JPH0351485B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a method for straightening the circumference of an endless steel belt, and specifically to a metal laminated endless belt used in a continuously variable transmission for power transmission. (hereinafter referred to as a steel belt) relates to improvement of interlayer difference accuracy and circumferential length adjustment.

<Prior art> For example, a steel belt with a thickness of 0.1 to 0.3 mm and a width of 10
~20mm, length 400~800mm hooves can be used in a multi-layer stack of 10~20 layers.

At this time, the circumference accuracy of each houb is ±0.020 of the circumference.
Extremely high precision quality, such as mm, is required.

Conventionally, methods for manufacturing or straightening this type of belt have been disclosed in Japanese Patent Application Laid-Open No. 163750/1983 and Japanese Patent Application No.
The one described in the specification of No. 57-191321 is known.

In the case of the former (Japanese Patent Application Laid-Open No. 163750/1983), "a plurality of metal endless belts manufactured with a circumferential length difference of approximately 2πt (t: thickness of the endless belt) are stacked in a multiple ring shape. A metal core material having a larger coefficient of thermal expansion than the multiple ring is inserted into the core of the multiple ring, and the whole is heated in this state to thermally expand the entire ring, and the multiple ring undergoes a phase change such as transformation or precipitation. The multi-rings are plastically deformed along the core metal material by causing the ring to occur, the dimensions of the multiple rings are simultaneously corrected in each layer, and then the whole is cooled and the core metal material is extracted.

Regarding the latter (Japanese Patent Application No. 57-191321), "a plurality of metal endless belts manufactured with a circumference difference of approximately 2πt (t: thickness of the endless belt) are stacked in a multilayer annular shape. After the metal cylinder is fitted onto the outer periphery of the metal cylinder, internal pressure is applied to the inner surface of the metal cylinder to uniformly expand it in the radial direction, so that the metal endless belts adjacent to the metal cylinder are in close contact with each other. It imparted a permanent deformation of .

<Problems to be Solved by the Invention> The former of the above-mentioned prior art poses a problem when, for example, an extremely high level of precision is required, such as an interlayer difference precision of +0.02 to -0.02 mm. It was hot.

In other words, the difference in coefficient of thermal expansion between stainless steel, which is the core material, and maraging steel, which is the belt material, is not always constant, and the coefficient of thermal expansion of maraging steel itself changes above and below its transformation point. For this reason, high precision machining was impossible.

In the latter case, since the elastic deformation of the core metal is used, the tube expansion rate (peripheral elongation rate) cannot be made large; in reality, it is around 0.3%, and sufficient correction must be carried out. I couldn't do it.

Therefore, for example, in order to obtain a deformation amount of 1%, approximately three core metals are required in order of increasing size, and the number of steps increases accordingly. Additionally, the durability of the core metal was a problem.

<Means for solving the problem> The present invention extends the circumference of the steel belt by wrapping a multilayered endless steel belt around a driving roller and a driven roller, and increasing the distance between the axes of both rollers. It attempts to solve the conventional problems by correcting it, and therefore,
The first aspect of the invention is characterized in that an endless steel belt is installed between a driving roller and a driven roller so that it can circulate freely, and a predetermined tension is applied to the belt by a driving means that adjusts the distance between the axes of both rollers. At the same time, the detection means for detecting the distance between the roller axes detects that the distance between the roller axes has reached a predetermined intermediate point before the final point corresponding to the intended circumference of the belt. The second aspect of the present invention is characterized in that the tension applying force of the driving means is reduced by the detection, and then the tension applying force of the driving means is eliminated by detecting the final point of the distance between the roller axes. In this method, an endless steel belt is installed between a driving roller and a driven roller so that it can freely circulate, and the distance between the roller axes is detected while applying a predetermined tension to the belt using a driving means that adjusts the distance between the axes of both rollers. detecting means detecting that the distance between the roller axes has reached an intermediate point corresponding to the elastic limit of the belt before the final point corresponding to the desired circumference of the belt; to reduce the tension applying force of the driving means to a predetermined value, and then,
The point is that the tension applying force of the driving means is eliminated by detecting the final point of the distance between the roller axes.

<Example> First, an apparatus used in an example of the present invention will be described in detail with reference to FIGS. 1 and 2.

A driving roller 11 and a driven roller 12 are placed on the surface plate 10.
are provided with a distance between the roller axes.

The driving roller 11 and the driven roller 12 are both in the shape of a cylindrical or flat roller,
They are attached to roller shafts 13 and 14, respectively.

The drive roller shaft 11 is mounted on a fixed bearing box 1 on a surface plate 10.
5 and a removable bearing box 16 via roller bearings 17, and the removable bearing box 16 can be freely inserted and removed in the axial direction of the roller. A drive motor 19 with a variable motor is attached to the end of the roller shaft on the bearing box 15 side.

A pair of slide rails 20 are formed on the surface plate 10 on the driven roller 12 side in a direction perpendicular to the roller axis, and a pedestal 21 is slidably mounted on the slide rails 20.

One end of the driven roller shaft 14 is supported via a roller bearing 23 in a bearing box 22 fixed to a pedestal 21, and the other end is supported by a conical bearing box 24 in a removable type bearing box 24 which can be freely inserted into and removed from the pedestal 21 in the roller axial direction. The driven roller 12 is supported via a shaped bearing box 25 and a roller bearing 26, and the driven roller 12 is supported on both sides on the frame 21.

That is, the drive roller 11 and the driven roller 12 are supported by bearing means 28 and 29, and one of the bearing means 28 and 29 can be freely inserted into and removed from the roller axial direction.

The driving roller 11 and the driven roller 12 are on the same plane, and a multi-layer body of an endless steel belt 30 can be freely wound and removed between the rollers 11 and 12.

The pedestal 21 is capable of reciprocating along the slide rail 20 in a direction perpendicular to the roller axis direction, and the pedestal 21 is equipped with a double-action telescopic hydraulic cylinder 3.
The distance between roller axes can be freely adjusted in size by a driving means 32 composed of 1.

That is, the piston rod end of the cylinder 31 is fixed to the frame 21, and the cylinder 31 is attached to the surface plate 10 via a bracket 32'.

The oil sent from the hydraulic pump 33 is supplied to each oil chamber of the hydraulic cylinder 31 via the oil passage 3 through switching of the control valve 34, which is exemplified by a 4-port electromagnetic valve in this example.
The liquid can be sent and discharged through the pipes 5 and 36.

Solenoids 34A and 34B of the control valve 34 are connected to a power source 37 via a drive switch 38 and a relay 39 having terminals 38A and 38B.

A detection means 40 is provided for detecting the distance between roller axes adjusted by the drive means 32. This detection means 40 is composed of a scale 42 having a stopper 41, a slider 43 slidable on the scale 42, a tension spring 44 of the slider 43, and the like. It is movable in synchronization with the pedestal 21 against a spring 44.

The slider 43 has an electronic micro-type length measuring meter 45.
The length measuring meter 45 has a switch 46 for setting an upper limit value and a switch 4 for setting a slow speed value.
7. A display meter 48, a slow speed switch 47A, and an upper limit switch 46A are provided, and the switches 46A, 47
A is connected to the relay 39, and further connected to a solenoid 48A of a control valve 48, which is a two-port electromagnetic valve provided on the oil path 35 side. In addition, 49
indicates a relief valve.

Next, using the above device, the steel belt 30
A method for correcting the circumference will be explained.

First, between the driving roller 11 and the driven roller 12,
An endless steel belt 30 is installed so that it can freely circulate. During this construction, when the solenoid 34B of the control valve 34 is applied, hydraulic pressure from the pump 33 is sent to the cylinder 31 in the extending direction via the oil passage 36, while the driving roller 11, the driven roller 12
One of the respective bearing means 28, 29 is shown by arrow A.
Since the steel belt 30 is removable in the direction of
1 and 12 are supported on both sides.

At this time, the slider 43 of the length measuring stylus 40
It is pulled by a spring 44 and is brought into contact with the pedestal 21 and stopped.

The upper limit value setting switch 46 of the length measuring meter 45 is set to the final value for expanding and correcting the steel belt 30, that is, the final roller axis distance corresponding to the required circumferential length value.

In addition, the slow speed value setting switch 47 is set to a circumference value lower than the predetermined circumference value, that is, the intermediate point before the final roller axis distance, and the display meter 48 and internal counting circuit are reset to "0" by the reset switch. ”.

Next, when the terminal 38A side of the drive switch 38 is brought into contact and the solenoid 34A of the control valve 34 is energized, hydraulic pressure in the direction of contraction is applied to the hydraulic cylinder 31, and the driven roller 12 is moved in the direction of arrow B via the mount 21. will be moved to

At this time, the slider 43 of the measuring head 40 is
1 for synchronized operation, the parallel movement distance of the driven roller 12 is detected, this is counted by the length measuring meter 45, and is displayed on the display meter 48.

When the motor 19 is set to a predetermined rotational speed and driven, and the oil pressure in the contraction direction continues to be applied to the hydraulic cylinder 31, the circumferential length of the steel belt 30 is expanded.

The value displayed on the display meter 48 is the slow speed value setting switch 4.
When the circumference value set in 7 is reached, the slow speed switch 4
7A is connected, the solenoid 48A is energized, the control valve 48 is opened, and the pressure in the hydraulic circuit 35 is adjusted to be reduced by the relief valve 49.

As a result, the driving speed of the hydraulic cylinder 31 becomes very slow, which improves the accuracy of the next driving stop.

Furthermore, the circumference of the steel belt 30 is expanded little by little, and when the displayed value of the display meter 48 reaches the setting value of the upper limit setting switch 46, the upper limit switch 46
When A is opened and relay 39 is disconnected, control valve 3
The four solenoids 34A are demagnetized, the respective valves 34 are placed in the neutral position, and the hydraulic cylinder 31 is stopped.

Therefore, when the circumferential length of the steel belt 30 is expanded to the required circumferential length value set in the upper limit value setting switch 46, it is automatically stopped from the slow expansion speed with high precision, and is stacked in multiple layers of 10 to 20 layers. The interlayer difference accuracy and circumferential length adjustment for one set of steel belts 30 can be achieved all at once.

Further, by wrapping two or more multilayered steel belts 30 around the drive roller 11 and the driven roller 12 in parallel, further improvement in productivity can be expected.

FIG. 3 is a graph showing the method of the above embodiment.

Here, it is most efficient to set the intermediate setting value of the distance between the roller axes for setting the slow speed value setting switch 47 to a value corresponding to the boundary where the steel belt 30 changes from elastic deformation to plastic deformation, that is, the elastic limit. good.

That is, straightening is performed by causing plastic deformation, and control of the deformation rate in the plastic deformation region is most important.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and the roller axle distance detection means may be a linear one such as magnet steel, or a pulse encoder that converts linear motion into rotational motion and detects it. It is not limited to things that measure distance continuously like these, but also using limit switches etc.
It may also be something that detects "points".

Further, if the cylinder pressure of the roller shown in FIG. 3 is automatically controlled so that the displacement curve becomes a predetermined curve, even higher precision correction becomes possible.

According to the present invention, since the multi-layered steel belt is wrapped around the driving roller and the driven roller so that correction can be performed at once, the working time is greatly shortened, and furthermore, at the intermediate point, Since the straightening speed is reduced, the interlayer difference accuracy can be reliably improved.

[Brief explanation of drawings]

FIG. 1 is a planar overall configuration diagram showing an apparatus used in an embodiment of the present invention, FIG. 2 is a diagram taken along the line CC in FIG. 1, and FIG. 3 is a graph showing a working process. 11... Drive roller, 12... Followed roller, 2
1... Frame, 28, 29... Bearing means, 31...
Hydraulic cylinder, 32... Drive means, 34... Control valve, 40... Detection means, 42... Scale, 43
...Slider, 45...Length measuring meter.

Claims (1)

[Scope of Claims] 1. An endless steel belt is installed between a driving roller and a driven roller so as to be able to circulate freely, and while applying a predetermined tension to the belt by a driving means that adjusts the distance between the axes of both rollers, The detection means for detecting the distance between the axes detects that the distance between the roller axes has reached a predetermined intermediate point before the final point corresponding to the target circumference of the belt, and by this detection, A method for correcting the circumferential length of an endless steel belt, comprising reducing the tensioning force of the driving means, and then eliminating the tensioning force of the driving means by detecting the final point of the distance between roller axes. 2. An endless steel belt is installed between the driving roller and the driven roller so that it can circulate freely, and the distance between the roller axes is detected while applying a predetermined tension to the belt using a driving means that adjusts the distance between the axes of both rollers. The detection means detects that the distance between the roller axes has reached an intermediate point corresponding to the elastic limit of the belt before the final point corresponding to the target circumference of the belt, and by this detection, A method for correcting the circumference of an endless steel belt, comprising reducing the tensioning force of the driving means to a predetermined value, and then eliminating the tensioning force of the driving means by detecting the final point of the distance between roller axes. .