JP2764444B2 - Side trimmer knife shaft temperature adjustment mechanism - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a side trimming device for trimming both edges of a conveyed thin plate in the width direction, and more particularly, to adjusting the temperature of a knife width for rotating a rotating knife. Trimmer knife shaft temperature adjustment mechanism for adjusting the temperature.

[Conventional technology]

This type of side trimming apparatus includes two left and right trimmer knives each composed of a pair of upper and lower rotary knives facing each other with a clearance in order to trim both widthwise edges of a conveyed thin plate. Each of the rotating knives is held in the housing via a bearing and rotates with the knife shaft about a knife shaft supported by the bearing. The rise and fall of the temperature of the knife shaft causes the knife shaft to expand and contract. Therefore, when a temperature difference occurs between the knife shafts rotating the upper and lower rotary knives, the clearance between the upper and lower rotary knives changes. When the clearance changes, the rotary knife is damaged or cannot be cut, and the cut surface is defective (burr generation, secondary cross section). It is empirically known that the clearance is usually optimally about 10% of the plate thickness.

Conventionally, a method for maintaining the clearance at a predetermined value has been proposed. For example, in Japanese Utility Model Laid-Open Publication No. 63-158721, a fluid passage is provided inside a knife shaft (arbor shaft), a fluid flows through the fluid passage, and the knife shaft is thermally expanded and contracted by heating and cooling. It discloses that the length of the knife shaft is adjusted to adjust the clearance (gap) between the upper and lower rotating knives.

[Problems to be solved by the invention]

However, the above publication discloses a side trimming device capable of adjusting the length of the knife shaft by simply heating and cooling the knife shaft to thermally expand and contract the knife shaft in the axial direction. No indication is given as to how to take into account the rise in the temperature of the knife shaft due to the heat generated by the bearings, nor how to adjust the clearance between the upper and lower rotating knives.

Accordingly, an object of the present invention is to provide a side trimmer knife shaft capable of adjusting the clearance between the upper and lower rotary knives by controlling the temperature difference between the upper and lower rotary knives rotating the upper and lower rotary knives. It is to provide a temperature control mechanism.

[Means for solving the problem]

The side trimmer knife shaft temperature adjustment mechanism according to the present invention is
In a side trimming device for trimming both widthwise edges of a conveyed thin plate with two left and right trimmer knives each comprising a pair of upper and lower rotary knives facing each other with a clearance, a knife shaft having the rotary knives mounted thereon and / or Or, a cooling hole drilled in a bearing chock that supports the knife shaft via a bearing, and cooling medium supply means for supplying a cooling medium to the hole,
Temperature difference detection means for detecting a temperature difference between the knife shafts rotating the upper and lower rotary knives, and temperature control means for controlling the temperature of the knife shaft such that the detected temperature difference is equal to or less than a predetermined temperature difference. And characterized in that:

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Referring to FIG. 2, the side trimming device to which the side trimmer knife shaft temperature adjusting mechanism according to the present invention is applied is a device for trimming both edges in the width direction of the thin plate 1 to be conveyed. Trimmer knives 2R, 2
L is provided. A right trimmer knife 2R and a pair of vertically rotating knives 3RU and 3RD facing each other with a clearance are provided. Similarly, the left trimmer knife 2L includes a pair of vertically rotating knives 3LU and 3LD facing each other with a clearance. The upper right rotating knife 3RU is attached to one end of the upper right knife shaft 4RU, and rotates together with the upper right knife shaft 4RU. Similarly,
The lower right rotating knife 3RD, the upper left rotating knife 3LU, and the lower left rotating knife 3LD are respectively a lower right knife axis 4RD and an upper left knife axis 4
LU and lower right knife shaft attached to one end of lower left knife shaft 4LD
It rotates with 4RD, upper left knife axis 4LU, and lower left knife axis 4LD. Upper right knife shaft 4RU has bearings 5RU and 6RU accommodated in housing (not shown) corresponding to two bearing chocks 7 spaced from each other.
Is supported by Similarly, the lower right knife axis 4RD, the upper left knife axis 4LU, and the lower left knife axis 4LD are accommodated in bearings 5R respectively corresponding to the two bearing chocks 7 arranged at the respective positions as described above.
It is supported by D and 6RD, 5LU and 6LU, and 5LD and 6LD. Double-row cylindrical roller bearings, double-row tapered roller bearings, angular contact ball bearings, and the like are used as bearings. Either of the two bearings 5 and 6 that support the respective knife shafts 4 is fixed in position.

At this time, it should be noted that most of the heat generated during operation of the side trimming device is generated in the bearing portion, and this heat causes the knife shaft to expand. The side trimmer knife shaft temperature adjusting mechanism according to the present invention cools the bearing chock 7 or the knife shaft 4 and manages the difference in expansion of the upper and lower knife shafts due to this heat, as will be described later. This is for keeping the clearance always at a desired value.

Referring to FIG. 3, a pair of vertically rotating knives 3RU, 3RD
Each not only face each other with a clearance [delta] _1, faces also have a wrap [delta] _2.

Next, a cooling method for suppressing heat generation in the bearings 5 and 6 will be described. For this, two methods described below are conceivable.

When there is no system to suppress heat generation because the bearings are grease-lubricated. As shown in FIGS. 4, 5 and 6, the bearings 5 and 6 are cooled inside the bearing chock 7 or the knife shaft 4. The temperature of the knife shaft 4 is controlled by the flow rate of the cooling water. When cooling water is supplied to the bearing chock 7, a cooling water hole 8 for cooling the bearings 5 and 6 is formed in the bearing chock 7,
For more effective cooling, the cooling water hole 8 may be formed in the vicinity of the bearings 5 and 6 so as to surround it.

When cooling water is supplied to the knife shaft 4, a cooling water hole 15 is formed in the shaft of the knife shaft 4, and a cooling water pipe 16 is inserted into the cooling water hole 15 via a rotary joint 17. The cooling water flows from the cooling water pipe 16 to the cooling water hole 15 to cool the bearings 5 and 6.

Although not shown, a cooling medium (water in the embodiment) is supplied to the cooling water holes 8 and 15 of the knife shaft 4 and the bearing chock 7.
It is needless to say that a cooling medium supply device for supplying the cooling medium is connected.

When the bearings are forcibly lubricated and lubricated A method of controlling the lubrication amount of each bearing and eliminating the temperature difference between the upper and lower knife shafts is conceivable. However, this method is not very effective if the temperature difference increases or the oil temperature itself increases. Therefore, a cooling device (cooler) for cooling the oil may be added, or the above method may be used in combination.

Next, with reference to FIG. 1, the management of the temperature difference between the upper and lower knife shafts according to the present invention will be described.

Measuring the temperature of the knife shaft 4 itself is
Is difficult because it is rotating. Therefore, in this embodiment,
Measure the temperature of bearings 5 and 6, which is the main cause of heat generation. Therefore, as shown in FIG.
6, a temperature sensor 11 is installed near the temperature sensor 11.
The temperature difference between the upper knife shaft 4RU (or 4LU) and the lower knife shaft 4RD (or 4LD) is determined from the temperature detected by
Is calculated. When the calculated temperature difference is equal to or larger than the predetermined temperature difference, the temperature difference detection device 12 sends the calculated temperature difference together with the operation command to the cooling pattern determination sequence 13.
In the cooling pattern determination sequence 13, a cooling pattern suitable for an actual machine is set in advance. In response to the operation command, the cooling pattern determination sequence 13 sends a water flow command for flowing the cooling water flow according to the calculated temperature difference to the flow control valve 14, and controls the opening of the flow control valve 14. The amount of cooling water for cooling the knife shaft 4 is adjusted.

In this case, the knife shaft 4 may be cooled only when necessary. Also, in the case where the temperature of the bearing rises as it gets burned, it goes without saying that control for cooling the knife shaft 4 may be performed.

In the temporary operation, the temperature difference between the upper and lower knife shafts (the temperature difference of the chocks near the bearings) is measured, and the water flow command is determined so as to match the actual machine.

As described above, by the temperature difference between the upper and lower knife shaft below a predetermined temperature difference, the knife clearance [delta] ₁ which is initially set can always be kept at a constant value, it is possible to perform good crop.

 Next, a specific example will be described.

A case where the thin plate 1 having a thickness of 0.1 mm is trimmed will be described. As mentioned above, the knife clearance δ ₁ is
Since about 10% of the thickness is good, and 0.010mm initial set value of the knife clearance [delta] _1. In this state,
Suppose there is a temperature difference of 5 ° C. between the upper and lower knife axes.
As shown in FIG. 2, the bearings 5 and 6 of the knife shaft 4 have a fixed type on the side 5 close to the knife 3.
The distance l ₁ between the bearing 5 and the knife 3 cutting point is 300 mm
And

A. When the temperature of the lower knife shaft is higher by 5 ° C. than the temperature of the upper knife shaft (Δt = 5 ° C.) In this case, the difference Δl between the expansion lengths of the upper and lower knife shafts is represented by the thermal expansion coefficient α (= 1.0 × 10 ⁻⁵ / ° C.), Δl = α × l ₁ × Δt = 1.0 × 10 ⁻⁵ × 300 × 5 = 0.015 Therefore, the knife clearance δ ₁ is 0.010 + 0.01
5 = 0.025 mm, which is 25% of the plate thickness, which increases the possibility of cutting failure.

B. When the temperature of the upper knife shaft is 5 ° C. higher than the temperature of the lower knife shaft (Δt = 5 ° C.) In this case, the knife clearance δ ₁ is 0.010−0.015 =
-0.005 mm, the upper and lower knives overlap (overlapping), and in such a plus case, the tips of the upper and lower knives are rubbed, thereby shortening the life of the knife and causing poor cutting.

In the present invention, the temperature difference between the upper and lower knife axes when the knife clearance is initially set is defined as an initial temperature difference, and thereafter,
The temperature difference between the upper and lower knife shafts is controlled so as to maintain the initial temperature difference.

Further, the cooling of the knife shaft is controlled so as to approach the initial knife shaft temperature so that the cutting width is constant.

〔The invention's effect〕

As is clear from the above description, according to the present invention, since the temperature difference between the upper and lower knife axes is controlled to maintain the predetermined temperature difference, the number of line stops during trimming is reduced, and the line yield is reduced. Is improved. Therefore, the quality of the trim cut surface (whether or not there is a secondary shear surface, and whether or not burrs are present) can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view and a block diagram showing a configuration of a side trimmer knife shaft temperature adjusting mechanism according to an embodiment of the present invention, and FIG. 2 is a configuration of a side trimming apparatus to which the side trimmer knife shaft temperature adjusting mechanism according to the present invention is applied. Sectional view showing the third
FIG. 4 is a cross-sectional view for explaining a clearance and a lap between a vertically rotating knife, FIG. 4 is a cross-sectional view showing a configuration of a cooling mechanism for cooling a knife shaft, and FIG. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 4, showing details of a cooling mechanism for cooling by passing cooling water through the holes. 11: temperature sensor, 12: temperature difference detection device, 13: cooling pattern determination sequence, 14: flow control valve.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B23D 19/06

Claims (1)

(57) [Claims] 1. A side trimming apparatus for trimming both edges in the width direction of a conveyed thin plate with two left and right trimmer knives each comprising a pair of upper and lower rotary knives opposed to each other with a clearance. A cooling hole formed in a knife shaft and / or a bearing chock that supports the knife shaft via a bearing, cooling medium supply means for supplying a cooling medium to the hole, and the upper and lower rotary knives. A side trimmer comprising: a temperature difference detecting means for detecting a temperature difference of a knife shaft rotating the knife shaft; and a temperature control means for controlling a temperature of the knife shaft such that the detected temperature difference is equal to or less than a predetermined temperature difference. Knife shaft temperature adjustment mechanism.