JPH0233930Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to an improvement of the driving force transmission device of a cold roll forming machine, and includes at least a pair of rotary plates whose peripheral edges have an arcuate cross section on the upper and lower roll shafts. hand,
It has a simple torque transmission mechanism in which the rotating plate on the driven shaft side comes into contact with the rotating plate on the driving shaft side with variable contact pressure force, and is ideal for high-speed, multi-stage cold roll forming of sheet material, so-called sheet material. The present invention relates to a driving force transmission device for a cold roll forming machine that can prevent material slipdown and roll marks.

BACKGROUND ART Cold roll forming machines generally consist of a pair of roll main shaft and roll follower shaft, and the rotational torque of the main drive shaft is transmitted to the follower shaft, but usually one of the roll shafts has a pressure adjustment mechanism. The distance between the pair of roll axes is not constant.

Therefore, when the amount of pressure adjustment is small, the torque transmission method to the driven shaft is to use a pair of directly connected transfer gear mechanisms that do not make the backlash constant, or, which is the most commonly used method, to use a complicated link gear mechanism. It also uses a universal joint type transmission mechanism that can drive both shafts, although it is expensive and requires a considerable amount of installation space.

When arranging roll forming machines in multiple stages to form a product with the desired shape, a fixed pass line is set, and the rotation speed of the vertical axis is calculated on the pass line to drive each forming machine, but in actual operation The upper and lower roll shafts do not necessarily need to be driven and rotated, and one of the shafts in a certain molding machine may be idle.

In other words, although it depends on the molding cross-sectional shape, slips due to mismatching of the rotational speed of the upper and lower axes can occur between the material to be molded and the roll, resulting in a large braking force, wasting driving power, and causing roll marks. was.

The roll shaft, which has become an idle shaft, is driven through the material to be formed, and the number of rotations of the idle shaft is determined by the contact situation with the material to be formed. In this state, the idle shaft and the material are driven. Slips with the molded material are minimized, driving force loss is minimized and roll marks are also reduced compared to the case of double shaft drive.

However, the driving force applied to the material to be formed is reduced by about half compared to a double-axis drive, so when the sheet material is continuously formed, the idle roll shaft stops from its stopped state when the tip of the sheet material gets caught in the roll. It is accelerated to a rotating state at once, but the driving force is small, so
There was a problem that the speed of the material to be formed slipped down.

Due to this slip-down, the interval between sheets passing through the sheets gradually narrows, and there is a problem that they eventually overlap.If the interval between sheets is widened, production efficiency decreases and various problems occur, so normally coils are Methods have been taken to avoid this problem by using materials, or by driving both the upper and lower axes.
On the other hand, there is also the problem that roll marks are likely to occur.
For example, in the case of producing a wide variety of products, sheet materials may be preferable in some cases, and there has been a desire to improve the above-mentioned problems.

In addition, when forming sheet materials at high speeds with a large number of forming stages, using gears to drive the roll shaft will result in loud meshing noise, so high-speed forming machines require
Generally, a universal joint type drive device is used, but this is expensive, the device is large, and installation space is an issue.In order to change the roll axis at the required location to an idle axis, the shaft and joint must be removed. In addition to the need to replace the rolls, there is also the problem that it becomes complicated to attach and detach the drive mechanism when replacing the rolls.

Purpose of the invention This invention solves the problems encountered when performing multi-stage forming of sheet materials at high speed, prevents slit-down and roll marks of sheet materials, has a simple structure, is easy to handle and maintain, and is inexpensive. The purpose is to provide a driving force transmission device for a cold roll forming machine.

Structure of the invention This invention is a cold roll forming machine that has a pair of upper and lower roll shafts arranged in parallel and has a torque transmission mechanism that transmits driving force from one roll driving shaft to the other roll driven shaft. In the driving force transmission device, the peripheral edges of at least a pair of rotary plates that are pivotally supported and opposed to each of the roll drive shaft and the driven shaft have an arcuate cross section, and the driven shaft side rotor plate is connected to the drive shaft side rotary plate. A driving force transmission device for a cold roll forming machine, characterized by a torque transmission mechanism that has a clutch means that changes the contact pressure force on the drive shaft, and brings the peripheral edge of the rotary plate on the driving shaft side into contact with the same part on the driven shaft side. be.

In addition, in the above configuration, this invention makes it possible to move a pair of rotary plates coaxially and axially on the driven shaft so as to sandwich the rotary plate on the driving shaft side, which has a contact surface with an arcuate cross section on both sides of the disc. This is a driving force transmission device for a cold roll forming machine, characterized by a clutch means which is pivotally supported by a clutch member and which biases the pair of rotary plates in opposite directions with a spring.

Disclosure of the invention based on drawings FIG. 1 is an explanatory diagram showing a roll shaft drive device of a cold roll forming machine according to this invention. Here, a case where the lower side is the roll driving axis will be explained.

Configuration: Rotating plate 2 supported by the lower roll drive shaft 1
The peripheral edge of one side of the disk is chamfered,
It is cut out by a circular arc having a constant radius R, and constitutes a cross-sectional circular arc surface 3.

The rotary plate 5 that is slidably supported in the axial direction on the upper roll driven shaft 4 has a rotary plate 5 on the side opposite to the arcuate cross-sectional surface 3 of the lower rotary plate 5, and on the peripheral edge like the lower rotary plate 2. , is cut out by a circular arc having a constant radius R, and constitutes a cross-sectional circular arc surface 3.

Further, the upper rotating plate 5 is pressed in the direction of the lower rotating plate 2 by a spring 6.

Effects In FIG. 1A, when the arcuate cross-sectional surfaces 3 of the upper and lower rotary plates 2 and 5 are brought into contact with each other, a reaction force F is generated by the spring 6 at the contact portion, and the rotation of the roll driving shaft 1 causes the roll A rotating torque of μ·F·r ₁ (μ: coefficient of friction, r ₁ : radius from the shaft to the contact portion) is generated on the driven shaft 4.

Further, as shown in FIG. 1B, the roll shaft 1,
4, the mutual contact area on the cross-sectional arcuate surface 3 changes, and the radius from the axis to the contact area similarly changes from radius r ₁ to radius r ₂ .
The rotation ratio does not change.

Furthermore, by changing the pressing force by the spring 6 of the upper rotary plate 5, the rotational torque from the roll driving shaft 1 can be transmitted to the roll driven shaft 4 in an amount of rotational torque that changes according to the pressing force. .

A roll forming machine equipped with a driving force transmission device achieved by this invention adjusts the pressing force on the contact surface of the upper rotary plate 5, and generates the minimum rotational torque necessary to maintain the rotation of the roll driven shaft 4. When the sheet material to be formed is bitten by the roll,
The roll driven shaft 4 is rotating at approximately the expected rotation speed and is not accelerated by the sheet material.
Conversely, it is also possible to accelerate the sheet material by the flywheel effect caused by the rotation of the driven shaft and roll, and after biting, the driven shaft side performs almost the same function as the idle shaft, and the required speed is increased. The rotation state is maintained.

Therefore, slip-down when the leading edge of the sheet material gets caught is prevented, the rotational speeds of both the upper and lower axes can be matched, and roll marks are not generated.

In addition, as mentioned above, rotational torque transmission by the rotary plate requires only the minimum necessary torque, and after the sheet material is bitten, it acts as a braking force due to the difference in the rotational speed of both shafts, so the contact surface of the rotary plate It is preferable that the coefficient of friction is as small as possible, and the contact surface of the rotary plate or the arc of cross section may be made of, for example, a self-lubricating material, and if necessary, a lubricant may be supplied to the contact surface. .

Embodiment FIG. 2 is an explanatory diagram showing a driving device for the upper and lower roll shafts of a roll forming machine according to this invention. Here, a case will be described in which the lower roll shaft is the main drive shaft.

Configuration Rotating disk 1 supported by the lower roll drive shaft 1
0, the circumferential edges of both sides of the disk are chamfered to form circular arcs having a constant radius, and both surfaces constitute a contact surface 11 having an arcuate cross section.

A pair of rotating plates 12 and 13 are supported on the upper roll driven shaft 4 so as to be slidable in the axial direction.

The peripheral edges of the opposing plate surfaces of each of the rotating plates 12 and 13 are chamfered to form a circular arc having a constant radius, thereby forming an arcuate cross-sectional surface 3.

The contact surface 11 of the rotating disk 10 is fitted into the opposing arcuate cross-sectional surfaces 3, and
The pair of rotary plates 12 and 13 includes a plurality of connecting rods 14 that pass through the center of the rotary plates and are arranged parallel to the driven shaft 4, and a connecting rod 1 on the outward surface side of each rotary plate 12 and 13.
4 and a spring 15 wound around the spring 15.

Effect Rotating disk 10 by a pair of rotating plates 12 and 13
The pressing force of the spring 15 on the contact surface 11 of the connecting rod 1
By moving and adjusting the position of the nut screwed into the four ends, the rotational torque of the roll driving shaft 1 is increased from the rotating disc 10 to the pair of rotating plates 12 and 13.
The minimum rotation torque necessary to maintain the rotation of the roll driven shaft 4 is transmitted to the roll driven shaft 4.

In the roll forming machine having the above configuration, when the sheet material to be formed is bitten by the rolls, the roll driven shaft 4 is rotating at approximately the predetermined rotation speed and is accelerated by the sheet material. After the sheet material is caught, the roll driven shaft 4 side performs almost the same function as the idle shaft and maintains the required rotational state, preventing slip-down when the tip of the sheet material gets caught. This has the advantage that the rotational speeds of both the upper and lower axes can be matched, and roll marks do not occur.

[Brief explanation of the drawing]

FIGS. 1A and 1B are explanatory diagrams showing the mechanism of a driving force transmission device for a cold roll forming machine according to this invention.
FIG. 2 is an explanatory diagram showing the configuration of another driving force transmission device according to this invention. 1... Roll driving shaft, 2, 5, 12, 13...
Rotating plate, 3... Arc surface in cross section, 4... Roll driven shaft, 6, 15... Spring, 10... Rotating disk, 11
...Contact surface, 14...Connecting rod.

Claims (1)

[Claims for Utility Model Registration] 1. A cold roll having a pair of upper and lower roll shafts arranged in parallel and having a torque transmission mechanism for transmitting driving force from one roll driving shaft to the other roll driven shaft which is rotationally driven. In a driving force transmission device for a molding machine, the peripheral edges of at least a pair of rotary plates that are pivotally supported and opposed to each of a roll driving shaft and a driven shaft have an arcuate cross section, and the driven shaft side rotary plate has a main driving shaft side. Driving force transmission for a cold roll forming machine characterized by a torque transmission mechanism that has a clutch means that varies the contact pressure force against the rotary plate and brings the peripheral edge of the rotary plate on the driving shaft side into contact with the same part on the driven shaft side. Device. 2. A pair of rotary plates are coaxially and movably supported in the axial direction on the driven shaft so as to sandwich the rotary plate on the driving shaft side, which has contact surfaces with an arcuate cross section on both sides of the disc,
The driving force transmission device for a cold roll forming machine according to claim 1, characterized in that the pair of rotary plates is biased by a spring in opposite directions.