JPH029525A - Slit device - Google Patents

Abstract

PURPOSE:To suppress the generation of residual stress and burr after the slitting of metal plate, etc. by shifting a pair of slit blade arranged up-and-down from other slit blades by the thickness of one blade in its axial direction. CONSTITUTION:A sheet of band plate is fed through guide rollers, 9a and 9b, to the intersecting point of slit blades, 1a, 1b and 1c, which are rotating from the tangential direction of the intersecting point C. The band steel is then fed in and supported by the slit blades, 1b and 1c, which are staggered in the axial direction by the thickness of the slit blade 1a. A prescribed shearing force is given by the slit blade 1a to the band plate, and the band plate is cut into a wide slit strip 7 and a narrow slit strip 8. The wide slit strip 7 cut this way is free from any residual stress or burr since it was cut while supported by the slit blades, 1b and 1c, so that the surface quality of band plate can be improved this way.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a slitting device, and in particular, it is capable of cutting a strip by suppressing the occurrence of residual stress, burrs, etc., and eliminating misalignment of the shearing force application position. This invention relates to a slitting device.

[Conventional technology]

Conventionally, when cutting metals, non-metals, etc., a slitting device as shown in FIG. 4 has been used. This has a pair of shafts (not shown) with slit blades 1a and 1, respectively.
b are fixed at different positions by the thickness of the slit blades 1a and 1b in the direction of the rotation axis, and the bands Fi and 2 are passed from the direction of the arrow through the meshing portion of the slit blades 1a and lb, thereby forming two band plates. It is cut into 2 pieces. Also, the fifth
Figures (a) and (b) show a plurality of slit devices shown in Figure 4 arranged in the direction of the rotation axis. That is, the pair of shafts 5
A, 5b fix a plurality of slit blades 1a, 1b with a wide sleeve 3 and a narrow sleeve 4 in between, and the relative positions of the slit blades 1a, 1b are alternately different.

Therefore, it is possible to simultaneously cut a plurality of strips using the plurality of slit blades 1a and lb. However, according to this cutting method, residual stress is generated at the cut surface of the strip and in the vicinity thereof, and if the stiffness of the strip is low, this causes deformation. For example, this is the deformation that occurs after semiconductor lead frame material undergoes stamping. Even if the lead frame material before stamping has high rigidity and maintains flatness against residual stress near the cut surface, if the rigidity decreases after stamping, the lead frame material will deform due to the residual stress. This causes problems in the quality of semiconductors. In addition, if burrs occur, there is a risk that the surface of the slit strip may be damaged when the slit strip is wound into a coil shape, and it also becomes an obstacle in the conveyance process for sending the slit strip to the stamping process.

Therefore, counter cutter methods, roll slitting methods, etc. have been used to solve the problems of residual stress, burrs, etc.

FIGS. 6(a), (b), (C), and (d) show the counter cutter method. (a) and (b) show the first stage slitting device which is the first step, and the slit blade 1a fixed to the upper shaft 5a and the slit blade 1b fixed to the lower shaft 5b are oriented in the direction of the rotation axis. , and there is a predetermined gap g between them, and when the strip plate 2 is sandwiched,
Cut the strip plate 2 in half so that it does not separate completely. In addition, (C) and (d) show the latter stage slitting device which is the second step, and the slitting blade I fixed to the shafts 5c and 5d.
C11d applies a shearing force in the opposite direction to the half-cut strip 2 sent from the previous slitting device to completely separate the strip 2. The strips cut by this method have no burrs, and the residual stress generated during slitting is also reduced.

Figure 7 (a), (b), (C), (d), (e),
1 shows the roll slitting method, (a) and 3) show the slitting device in the first stage, which is the first step, and the upper shaft 5
The slit blade 1a fixed to a and the lower shaft 5b
The slit blades 1b fixed to are offset by the thickness of the slit blades in the direction of the rotation axis, and there is a predetermined gap g between them. Therefore, when the strip plate 2 is sandwiched, the strip plate 2 is cut in half without being completely separated.

In addition, (C) and (B) show the start state of the second process, in which the strip plate 2 cut in half by the slitting device in the previous stage is fed into the flat rolls 6a and 6b provided in the upper and lower pairs. . Furthermore, (e) and (f) show the completion state of the second step, in which the half-cut strip plate 2 is rolled between a pair of flat rolls 6a,
The strip plate 2 is completely separated by crushing it with 6b. The slit strip cut by this method has no burrs, and the residual stress generated during slitting is small.

[Problems to be Solved by the Invention] However, the counter cutter method and roll slitting method described above have the following problems.

(1) Counter cutter method The slit blades of the front-stage slitting device and the slit blades of the rear-stage slitting device cannot be properly aligned, that is, the shearing force application position of the front-stage slitting device and the shearing force of the rear-stage slitting device cannot be achieved. It is very difficult to precisely match the force application position in the shaft direction. Furthermore, even if this positional alignment is achieved, when moving the strip from the front slit device to the rear slit device, it is necessary to guide the strip so that the shearing force application position does not change, and this is because the thickness of the strip The smaller the size, the more difficult it is with current technology.

(2) Since the strip is crushed by the flat roll with roll slits, there is a risk that the surface of the strip may be damaged due to friction or foreign matter adhering to the roll.

This causes problems with the surface quality of the cut strips.

Therefore, it is an object of the present invention to suppress quality defects such as residual stress and burrs, and to easily cut strips without being limited by the technical level such as alignment of shearing force application positions. The purpose of the present invention is to provide a slitting device that can do the following.

Another object of the invention is to provide a slitting device that improves the surface quality of the strip.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention provides a slitting device in which two of a pair of upper and lower slit blades are arranged such that one of the upper and lower slit blades is positioned axially different from the position of the other slit blade by the thickness of the slit blade. It is something to do.

That is, the slitting device of the present invention is composed of an upper slitting blade and a lower slitting blade, and the two lower slitting blades are arranged at different positions in the axial direction from the position of the upper slitting blade by the thickness of the slitting blade. be done. In the case of this embodiment, which will be described later, both sides of the upper slit blade are in contact with one side of each of the two lower slit blades arranged, and by passing the band plate, the lower slit blade mainly supports the band plate. Then, the upper slit blade applies a predetermined shearing force to cut the strip. Further, this slitting device is provided with a guide means so that the strip can be inserted from the tangential direction at the intersection of the upper slit blade and the lower slit blade on the outer circumferential line (on the strip insertion side). , guide rollers, etc. are suitable.

(Operation) When the strip is fed through the guide means from the tangential direction of the intersection of the upper and lower pair of slit blades (on the strip insertion side) and is sandwiched between the rotating upper and lower slit blades,
The two slit blades, which are the lower slit blades, mainly support the strip and are applied with a predetermined shearing force by the upper slit blade, thereby cutting the strip into wide slit strips and narrow slit strips. Since the strip is supported and cut by the lower slit blade in this way, there is no residual stress or burrs, and since the strip is inserted from the tangential direction of the intersection, the upper and lower slit blades do not force the strip. It can be inserted without applying any force. Furthermore, since the strip is cut in one step using one slitting device, it is possible to eliminate the difficulty and trouble of aligning the shearing force application position.

〔Example〕

Hereinafter, the slitting device of the present invention will be explained in detail.

FIGS. 1(a) and (1)) show an embodiment of the present invention, in which a shaft 5a is connected to a slit blade 1a through a sleeve loa.
is fixed to the shaft 5b via the sleeve 10b, and the slit blade 1b is positioned at a position different from the position of the slit blade 1a by the thickness of the slit blade in the rotational axis direction.
, 1c are fixed. A part of both sides of the slit blade 1a is in contact with a part of one side of the slit blade 1b, lc, and a band plate is inserted as appropriate to both the slit blades 1a, , Ib,
By rotating lc in the direction of the arrow, the strip is completely cut to form wide slit strips 7 and narrow slit strips 8. That is, the slit blades 1b and lc mainly support the strip while feeding it, and the slit blade 1a applies a predetermined shearing force to the supported strip. Slit blade 1a and slit blade 1b, a guide roller 9a that guides the strip so that the strip can be inserted from the tangential direction (direction of the arrow) of the intersection C on the outer circumferential line of the IC (strip inserting side);
9b is provided, and by inserting the strip plate from the tangential direction of the intersection C, the slit blades 1a and 1b, 1
It can be inserted easily between c. Incidentally, the combination of these slit blades 1a, 1b, and IC is called shaft 5a.
, 5b via sleeves 10a, 10b, it is possible to simultaneously cut into a plurality of wide slit strips 7. In addition, the slit blade 1a and the slit blade 1b
, 1c do not necessarily need to be in contact; for example,
A slight gap may be provided in the direction perpendicular to the axis to facilitate insertion of the strip.

In the above configuration, the band plate is fed through the guide rollers 9a, 9b from the tangential direction (arrow direction) of the intersection C to the intersection C of the rotating slit blades 1a, 1b, and lc. At this time, the strip is fed and supported by the slit blades 1b and lc, and the strip is completely cut by applying a predetermined shearing force to the strip by the slit blade 1a. 8 is formed. Since the wide slit strip 7 cut in this way is cut while being supported by the slit blades 1b and 1c, there is no residual stress or burrs, etc. This principle applies when cutting a strip using a shear cutting machine. The same principle applies, and it is generally known that almost no residual stress is generated inside a strip plate that is fixed on a shear base plate and cut.

Furthermore, since the strip is cut in one step using one slitting device, it is possible to eliminate the difficulty and trouble of aligning the shearing force application position.

In addition, since the narrow slit strip 8 has a large residual stress, it is disposed of as waste.

The material of the band plate applicable to the present invention is not particularly limited, and can be applied to metals, non-metals, and other gold film materials. Instead of the provided slitting device, a slitting blade may be provided by cutting the surface of a roll having a shaft, and an integrated slitting device may be configured.
It can be formed by grinding a flat roll and carving out desired positions to add steps to the roll. This slit device can provide similar effects and also facilitates assembly.

Figure 2 shows an experimental method for measuring the residual stress in the wide slit strip 7.Generally, the residual stress caused by slitting is concentrated near the slit cut surface, so the inner side of the slit surface is 211 Im from both ends 7a and 7b. The etching portions 11a and 11b are etched with a width of l, and by releasing the center portion of the slit strip 7 from the restraint, the amount of warpage of each end portion 7a and 7b is measured. As a result, as shown in FIG. 3, the amount of warpage after etching increases in proportion to the amount of overlap of the slit blades, but the wide slit strip 7 of the present invention reduces the amount of warp to less than 10 degrees and the amount of overlap. It can be seen that the amount of warpage hardly changes even if it rises. On the other hand, it can be seen that the slit strip cut by the conventional slitting device has a warpage amount of 40 or more, and the warpage amount increases in proportion to the overlap amount. It can be seen that no residual stress is generated in the wide slit strip 7 cut by the slitting device of the present invention.

〔Effect of the invention〕

As explained above, according to the slitting device of the present invention, one of the pair of upper and lower slit blades is disposed at different positions in the axial direction from the position of the other slit blade by the thickness of the slit blade, resulting in residual stress. This suppresses the occurrence of burrs, etc., and eliminates the need to align the shearing force application positions. Furthermore, since no roll means with a smooth surface is used, the surface quality of the strip does not deteriorate.

[Brief explanation of the drawing]

FIG. 1(a), Q)) shows an embodiment of the present invention;
) is a front view, (b) is a side view, Fig. 2 is an explanatory diagram showing the experimental method for measuring the residual stress of the cut slit strip, Fig. 3 is an explanatory diagram showing the experimental results, and Fig. 4 ( a) and (b) show the conventional slitting device, (a) is a side view, Φ)
is a front view, and Figures 5 (a) and (b) show examples of its application.
(a) is an overall perspective view, (b) is a front view, Fig. 6 (a),
(6), (C), and (A) show the counter cut method;
a), (b) are front and side views of the first step, (
C) and (d) are front and side views of the second step, and Figures 7 (a), (b), (C), (d), (e), and (f) show the roll slitting method; (a), (b) are front and side views of the first step, (C), (d), (e),
are a front view and a side view of the second step. Explanation of symbols 1a, 1b, 1c, 1d-
--------- Slit blade 2 --- Band plate 3 --- Wide sleeve 4 --- Narrow sleeve 5a, 5b, 5C15d -----Sha 7 Toro a,
6b-・・-・−・・−・Flat roll 7・−・−・−・−
Wide slit strips 7a, 7b --- End portion 8 --- Narrow slit strips 9 a, 9 b --- Guide rollers 10 a, 10 b ------------S'J-P 4th (b)

Claims (2)

[Claims] (1) In a slitting device that cuts a strip of metal, non-metal, etc. into a predetermined width by sandwiching the strip between a pair of upper and lower slit blades, one of the pair of upper and lower slit blades is set from the position of the other slit blade. A slitting device characterized in that two slitting blades are arranged at different positions in the axial direction by the thickness of the slitting blade. (2) The slitting device according to claim 1, further comprising an insertion means for inserting the strip from a tangential direction of the intersection at an intersection of the outer circumferential lines of the pair of upper and lower slit blades on the strip insertion side.