JPS6149008B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a roll bending mechanism for a straightening device, and more particularly to a roll bending mechanism for a straightening device that can provide effective roll bending for correcting the shape of a material to be straightened.

Shape defects such as waves, mid-elongation, edge elongation, etc. of the orthodontic material are caused by the presence of local strain, and this is corrected by applying tension to the orthodontic material at the same time as bending with a straightening device to cause plastic elongation. Ru.

In recent years, strict restrictions have been placed on the shape accuracy of products, and for this reason, it has become impossible for conventional straightening device mechanisms to fully satisfy the straightening accuracy.

Generally, when the material to be straightened is rolled down by the leveler roller, the upper and lower frames incorporating the leveler roller are bent due to the straightening load. Following the bending curve of the frame, it no longer comes into uniform contact with the material to be bent and straightened. Therefore, the plastic strain of the material to be straightened is
It differs depending on the position in the width direction of the plate, and complete correction is difficult.

The conventional roll bending mechanism is arranged between the leveler rollers 3, 3 and the upper and lower frames 5, 5 as shown in FIG. 7, in order to correct the influence on the leveler roller due to the deflection of the upper and lower frames. Adjust the height of the backup rollers 4, 4,
The leveler roller is maintained in a state where no deflection occurs. In this state, that is, when the leveler roller 3 and the material 2 to be straightened are brought into contact in a completely flat state, the material 2 to be straightened is repeatedly subjected to bending stress, but is not subjected to tensile stress. Even if there is local elongation in a certain part of the plate width, it is impossible to completely correct the local strain in that part.

By the way, for materials with edge elongation as an example of local elongation, giving a large bend to the center of the leveler roller will force plastic elongation at the center of the plate width. This is an effective means for correcting distortion.

The straightening function of the leveler roller is to apply a large plastic strain to the material to be straightened with the inlet roller, and to correct the shape while gradually reducing the plastic strain with the outlet roller. In the bending mechanism, since the same amount of bending is applied to all rollers from the inlet side to the outlet side, roll bending is also applied to the outlet side rollers, which require a small reduction amount to correct the shape of the material. Therefore, since there is a bend, the amount of reduction in the center part is large, and the straightening work ends with local distortions being applied to the material, which has the disadvantage that very high accuracy cannot be expected.

The present invention solves the above-mentioned conventional difficulties and provides a roll bending mechanism for a straightening device that can hold a leveler roller in a shape suitable for straightening the material when the material is locally strained. With the goal.

The roll bending mechanism of the straightening device according to the present invention includes a roll for passing a material to be straightened and correcting the shape of the material to be straightened, and a plurality of bending means for applying bending to a plurality of locations of the roll, respectively. In the roll bending mechanism of the straightening device, the entrance roller applies large plastic strain to the material to be straightened to make the strain state uniform;
The roll bend amount with the exit roller that corrects the shape of the material to be straightened with small plastic strain is individually adjusted.

The present invention will be explained below based on an embodiment shown in FIGS. 1 to 3 and 4.

The straightening device 1 includes leveler rollers 3 arranged in a staggered manner on both sides of a workpiece to be straightened 2, and a back-up roller 4 that supports the leveler rollers 3.
, back-up roller 4 and upper and lower frames 5,
The roll bending mechanisms 6, 7, and 8 are provided between the roll bending mechanism 5 and the roll bending mechanisms 6, 7, and 8.

As shown in FIG. 1, a plurality of back up rollers 4 are provided in the longitudinal direction of one leveler roller 2, and this back up roller 4 has holding members 9, 10, 11 for holding it, It is supported by the upper and lower frames 5, 5, respectively, via corresponding wedges 12, 13, 14. The roll bending mechanism 6 is formed by the holding member 9 and the wedge 12, and the roll bending mechanism 7 is formed by the holding member 10 and the wedge 13.
However, the holding member 11 and the wedge 14 each constitute a roll bending mechanism 8.

The holding member 9 has its upper surface, and the holding member 10,
The lower surface of each of the grooves 11 is formed as a slope inclined toward the exit side or the input side of the material to be straightened 2, and a groove 15 is formed in the longitudinal direction on this slope. In this groove 15, holding members 9, 10, 11 are provided.
Wedge 12,1 whose opposing surface has an arcuate cross section
3 and 14 are fitted together, respectively.

The wedges 12, 13, and 14 are mounted independently on the frame 5 via a bolt 16 protruding from these, nuts 17 and 18 screwed onto the bolt 16, and a protrusion 19 protruding from the frame 5. It is formed so that it can be slid and fixed. The holding members 9, 10, 11 are attached to the wedges 12, 13,
14, each can be independently adjusted in the vertical direction.

Roll bending mechanism 6 having the above configuration
functions to correct the deflection of the upper frame 5, the roll bending mechanism 8 functions to correct the deflection of the lower frame 5, and the roll bending mechanism 7 functions to correct the deflection of the lower frame 5 and to correct local distortion. It functions as a roll bend to correct the roll bend.

In the above configuration, when performing straightening, the leveler roller 3 first contacts the back-up roller 4 because the rolling load received from the material to be straightened 2 is large.
The back-up roller 4 follows the deflection of the frame 5. Therefore, the wedges 12, 13, 1 disposed between the backup roller 4 and the frame 5
4 in the longitudinal direction of the material to be straightened 2, the back-up roller 4 moves up and down, giving the leveler roller 3 a bend.

At this point, an appropriate bend amount is determined for the material to be straightened 2 in which a local strain with a steepness of γ exists.

The steepness γ (%) is given by γ=a/L (1), where L is the pitch of the waves in the local elongated area and a is the height of the waves in Fig. 3.

Also, the relationship with the steepness equivalent elongation εp (%) at this time is εp=(γ/6.37) ² ...(2).

When straightening a material in which such local strain exists, it is necessary to apply plastic elongation to other parts where there is no local strain to make the strain uniform across the width of the plate to eliminate the local strain.

In Fig. 2, the roller interval l, the correction reduction amount H
Then, when the roll bend amount h is given, the material 2 to be straightened changes from A-B-C to A-D-C, and the elongation Δl of the material 2 to be straightened during this time is approximately given by the following formula. .

Δl=2H・h/l ...(3) Increase in stress due to elongation Δl at this time Δσ
is Δσ=EΔl/2l=E・H・h/l ² (4).

Since the elastic bending stress and the tensile force of equation (4) act on the material to be straightened 2 during straightening, the stress and strain are a composite, and if the strain coefficient at that time, taking into account the yield point, is k, then , the strain Δε at the center of the plate thickness of the material to be straightened 2 is: Δε=kΔσ/E=kH・h/l ² ...(5) ∴h=Δε・l ² /k・H εp=Δε ∴h=εp・l ² /k・H=(γ/6.37) ² /k・
H ^l2 ...(7) becomes.

The amount of roll bend of the leveler roller 3 with respect to the material 2 to be straightened in which local elongation with steepness γ exists is determined by equation (7).

In order to effectively effect roll bending, it should be performed using a roller that applies strong pressure on the entry side and has a large strain coefficient k.

When the bend is applied to the exit side roller where the rolling reduction amount is small, only the center part of the roller or both ends of the roller comes into contact with the material to be straightened 2, plastic strain is generated in the material to be straightened 2 again, and it comes out of the straightening device 1. . This phenomenon occurs in a conventional bending mechanism that applies a uniform bend amount to all rollers as shown in FIG.

However, in this embodiment, roll bending for local correction is applied only by the roll bending mechanism 7, so that the material to be straightened 2 does not leave the straightening device 1 with plastic strain. .

Further, the roll bending mechanisms 6, 7, 8 are
Since each can be adjusted individually, an optimal bend can be applied depending on the degree of distortion.

FIG. 5 shows a modification of FIG. 4, in which the upper leveler roller 3 is fixed to the upper frame 5.

Even with this configuration, the same effects as those of the above-mentioned embodiments can be obtained, and the adjustment operation becomes easier.

FIG. 6 is a modification of FIGS. 4 and 5, in which a roll bending mechanism 7 is provided between a roll bending mechanism 8 and a leveler roller 3. FIG.

With this configuration, the amount of bending of the entrance roller can be adjusted by superimposing the amount of bending with respect to the bending of the frame and the amount of bending with respect to local distortion.

In each of the above-described embodiments, the number of rolls imparting roll bending was three on the entry side, but the same effect can be obtained with one or two rolls.

The present invention has been described above based on preferred embodiments, but according to the present invention, local distortion can be completely corrected.
Products with good accuracy can be obtained.

[Brief explanation of the drawing]

Figure 1 is a side view of the roll bending mechanism in the straightening device, Figures 2 and 3 are diagrams showing the relationship between the steepness of the material to be straightened and the amount of roll bending, and Figures 4 to 6 are respectively FIG. 7 is a front view showing an embodiment of the present invention, and FIG. 7 is a front view showing a conventional example. 1... Straightening device, 2... Material to be straightened, 3... Leveler roller, 4... Backup roller, 5...
Frame, 6, 7, 8...Roll bending device.

Claims (1)

[Scope of Claims] 1. A roll bending mechanism that is provided on a back-up roller that supports leveler rollers arranged in a staggered manner while holding a material to be straightened, and that bends the leveler roller by moving the back-up roller up and down. , a roll bending mechanism capable of applying a bend amount to correct local distortion is provided on the entry side leveler roller that gives the maximum correction strain to the material to be straightened, and furthermore, a roll bending mechanism that can apply a bend amount to correct local distortion is provided on the exit side leveler roller. A roll bending mechanism for a straightening device, characterized in that a correctable roll bending mechanism is provided, and the bend amount of the input side leveler roller is set larger than the bend amount of the output side leveler roller. 2. A roll bending mechanism for the entrance roller;
2. The roll bending mechanism of the straightening device according to claim 1, wherein the roll bending mechanisms of the exit side rollers are formed so as to be independently adjustable. 3. An exit roller roll bending mechanism is provided between the frame of the straightening device and the exit roller, and an entrance roller roll bending mechanism is provided between the entrance roller and the exit roller bending mechanism. A roll bending mechanism for a correction apparatus according to claim 1 or 2, characterized in that the roll bending mechanism is provided with a roll bending mechanism.