JPH0155927B2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to a method and apparatus for cutting a strip material,
In particular, it relates to a method and apparatus for cutting a strip material made of two or more laminated layers of different materials to produce a narrow strip plate that is used as a base material for a small oil-free flat bearing. It is something.

Conventional technology Small-diameter, short and oil-free compact flat bearings are conventionally
It was manufactured using the following process. In other words, a metal layer with anti-rust plating and a sintered alloy layer (other,
After manufacturing a narrow strip by cutting a wide strip made of a laminated body of plastic material (in some cases plastic material, etc.) parallel to its longitudinal direction, the strip is cut into a predetermined length. A rectangular plate is cut, the plate is bent in its longitudinal direction to form a cylindrical body, and the joint portion of this cylindrical body is welded or the bearing is formed without welding.

In the manufacturing process as described above, when cutting a wide strip material in the longitudinal direction, a known roller type slitter has conventionally been used.

FIG. 10 shows the schematic structure of a known roller-type slitter, in which 1 is a frame-shaped frame, 2 is a frame-shaped slitter;
3 is an upper roller that is supported horizontally on the frame 1 via bearings at both ends, and 3 is arranged parallel to and close to the upper roller 2 and supported by the frame 1 via bearings at both ends. This is the lower roller. A collar-shaped or disk-shaped (or ring-shaped) cutting edge 4 is provided on the upper roller 2 at a predetermined distance along its axial direction so as to protrude from the outer peripheral surface of the upper roller 2. The fixed position of the upper roller 2 can be adjusted in the vertical direction by rotating an operating handle 6 of a lifting screw 5 connected to bearing boxes (not shown) at both ends of the upper roller 2. On the other hand, the lower roller 3 has a stepped shaft structure with a plurality of extremely short small diameter portions 3a corresponding to the blade thickness of the cutting blade 4 of the upper roller 2, and the end surfaces of both ends of the small diameter portions 3a have a stepped shaft structure. A disc-shaped cutting blade 7 is attached close to the side surface of the cutting blade 4 of the upper roller 2.

When dividing a wide strip material into narrow strips using a known roller type slitter having the above-mentioned structure, first, the operation handle 6 is rotated to separate the upper roller 3 from the lower roller 3 before starting operation. roller 2
Adjust the fixing position of the upper and lower rollers, thereby adjusting the distance between the upper and lower rollers to match the thickness of the strip material, and setting the tip of the cutting blade 4 of the upper roller to enter between the cutting blade 7 of the lower roller. . After the upper roller 2 has been positioned in this way, the driving devices for the upper roller 2 and the lower roller 3 are started to rotate the upper roller 2 and the lower roller 3 in opposite directions, and in this state, the strip material 8 When fed between the upper and lower rollers, both cuts are made by the relative movement between the cutting blade 4 of the upper roller 2 and the cutting blade 7 of the lower roller 3 (the cutting blades 4 and 7 move in opposite directions to each other). Because shear force is generated between the blades,
The strip material 8 is sheared parallel to its longitudinal direction, and is bitten between the outer peripheral surfaces of upper and lower rollers to be fed in the longitudinal direction. As a result, from then on, the strip material 8 is automatically sheared to the rear end, and the strip material 8 is divided into a plurality of narrow strips 9.

Problems with the Prior Art The cutting method using the known roller-type slitter as described above has the following problems.

(1) Cutting is performed by applying sudden shearing force, which tends to cause burrs and sag on the cut surface, making it impossible to obtain a beautiful and neat cut surface. In particular, the strip that is the basic material for oil-free bearings is a laminate of a coating layer such as a sintered metal porous layer and a rust-proof plated backing metal layer, and the deformation rates of both layers (elastic deformation rate and plastic deformation rate) )
Since the two layers are different, peeling tends to occur between the two layers. Therefore, when the strip is cut into small strips 9 using a known roller-type slitter, the side edges of the strips 9, that is, the cut surface This not only causes burrs 10 and sag 11 as shown in FIG.
Peeling 14 from 3 tends to occur. If a bearing is manufactured using a small strip having such rough side edges, the dimensional accuracy and commercial value of the bearing will be significantly reduced. The various defects described above were removed by chamfering the side edges as shown by dotted lines 15 in FIG. However, a phenomenon has occurred in which minute chips scattered during chamfering adhere to the coating layer of the strip and penetrate into the coating layer, reducing the lubrication performance and durability of the bearing. Even with processing, it was not possible to completely restore the functionality. Another problem was that the manufacturing cost of the bearing was high because of the chamfering process.

(2) When cutting is performed with a known roller type slitter,
Since scraps with a width equal to the thickness of the cutting edge 4 of the upper roller 2 are produced, material efficiency is poor, and this is a factor in increasing the cost of the bearing.

Problems to be Solved by the Invention An object of the present invention is to provide a novel cutting method and device capable of solving the above-mentioned problems and obtaining a french-shaped body having beautiful and neat side edges. More specifically, it is an object of the present invention to provide a method and apparatus capable of cutting without causing burrs, sagging, layer peeling, etc. on the cut surface.

Summary of the Invention The method of the present invention eliminates the conventional method of applying sudden shear force to the strip material between two cutting blades moving in opposite directions, and cuts the strip material along the planned cutting line. The method is characterized in that after the strip material is sufficiently thinned locally, the thinned portion is sheared. More specifically, in the method of the present invention, grooves parallel to the longitudinal direction of the strip material are sequentially deeply carved in opposing positions on both surfaces of the strip material, and the strip material at the bottom of the grooves is After sufficiently thinning,
The thin portion is cut from one side of the strip with a blade inserted into the groove, thereby producing a small strip having chamfered side edges.

In the method of the present invention, two rollers each having an annular blade (or a collar-like protrusion) having a wedge-shaped or V-shaped cutting edge in cross section are arranged in parallel to form a roller pair. At least three pairs are arranged in tandem to constitute a rolling mill type cutting device, and while the strip material is passed from the first roller pair to the third roller pair, opposing positions on both sides of the strip material are provided. After cutting a continuous groove having a V-shaped cross section that becomes deeper in sequence, the strip material is cut along the groove in the step of passing the third pair of rollers. As described above, according to the method of the present invention, a strip material can be cut without causing burrs or sag on the cut surface.

Embodiments of the Invention Examples of the present invention will be described below with reference to FIGS. 1 to 7.

FIG. 1 is a schematic diagram of a cutting device for carrying out the method of the invention. In the figure, 16 is a frame, and three pairs of rollers 17 to 19, first, second, and third, are arranged in tandem on this frame 16, and the strip material 8 to be cut is placed in the first roller pair. The sheet is passed in the direction of the arrow f in the figure from the space between the upper and lower rollers of the roller pair 17 to the space between the rollers of the third roller pair 19. Bearing boxes 20 and 21 (chocks) for the upper and lower rollers belonging to each roller pair 17 to 19 are supported so as to be movable up and down with respect to the frame 16 so that their fixing positions can be adjusted in the vertical direction. The boxes 20, 21 are connected to lifting screw rods 22, 23, and the lifting screw rods 22, 23
Operating handles 24 and 25 for raising and lowering each bearing box 20 and 21 are attached to 23.
Upper rollers 26~ constituting each roller pair 17~19
28 and the lower rollers 29 to 31, as shown in FIGS. 2 to 7, have annular blades (or brim-like protrusions) 26a to 31a having a V-shaped or wedge-shaped cutting edge at the same position in the axial direction of each roller. When the strip material 8 is passed between the upper and lower rollers of each pair of rollers, the annular blades 26a to 2 of the lower roller 3
8a and the annular blades 29a to 31a of the lower roller simultaneously bite into opposing positions on both the upper and lower surfaces of the strip material 8, and as a result, at corresponding positions on both the upper and lower surfaces of the strip material 8, there are blades in the longitudinal direction of the strip material. approximately V extending to
A continuous groove with a letter-shaped cross section is carved. The first to third roller pairs are arranged so that when the strip material 8 passes through the third pair of rollers 19, the strip material 8 is cut and divided into small strips 9A having a width between the annular blades 28a and 31a of each roller. The annular blades 26a of the upper roller and lower roller of
The protrusion height and width of 31a are configured to have different dimensions as shown in FIGS. 5 to 7.
That is, the annular blades 26a and 29a of the upper roller 26 and lower roller 29 of the first roller pair 17 form extremely shallow V-shaped grooves 8 on both sides of the strip material 8, as shown in FIG.
It is formed with an extremely small protrusion height that is sufficient to engrave the portions a and 8b. Further, the annular blade 27a of the upper roller 27 of the second roller pair 18 is formed to have a height and width several times larger than the annular blade 26a of the upper roller 26 of the first roller pair 17, as shown in FIG. Therefore, when the strip material 8 passes through the first roller pair 17 and is bitten by the second roller pair 18, the strip material 8
The V-shaped groove 8a on the upper surface is carved wider and deeper by the annular blade 27a of the upper roller 27 of the second roller pair 18, and a wide and deep V-shaped groove 8c is formed on the upper surface of the strip material 8. be done.

On the other hand, the dimensions of the annular blade 30a of the lower roller 30 of the second roller pair 18 are the same as those of the lower roller 2 of the first roller pair 17.
The dimensions of the annular blade 29a of No. 9 are the same, and therefore,
When the strip 8 passes through the second pair of rollers 18, the V-shaped groove 8b on the lower surface of the strip 8 is not enlarged.

Further, the width and height of the annular blade 28a of the upper roller 28 of the third roller pair 19 are smaller than those of the annular blade 27a of the upper roller 27 of the second roller pair 18, so that the strip material 8 is Third roller pair 19
When bitten by the third roller pair 19, the tip of the annular blade 28a of the upper roller 28 does not contact the bottom of the V-shaped groove 8c on the upper surface of the strip material 8, and the V-shaped groove 8c is not expanded. .

On the other hand, the annular blade 31a of the lower roller 31 of the third roller pair 19 has a corresponding V-shaped groove 8 on both upper and lower surfaces of the strip material 8.
c, 8b is formed at a height that can penetrate the thin uncut portion remaining at the bottom of the groove, and therefore the strip material 8
When passing through the third pair of rollers 19, the annular blade 31a of the lower roller 31 cuts the uncut portion of the bottom of the V-shaped groove 8d from the lower surface side of the strip material 8.

That is, in the cutting device of the present invention having the above-described structure, when the strip material 8 is passed through the first pair of rollers 17, the annular blade 26a of the upper roller 26 and the annular blade of the lower roller 29 as shown in FIG. 29a, shallow Vs are formed at corresponding positions on both the upper and lower surfaces of the strip material 8.
Shaped grooves 8a, 8b are carved. Next, when the strip material 8 is passed through the second pair of rollers 18, the depth and width are further expanded on the upper surface of the strip material 8 by the annular blade 27a of the upper roller 27, as shown in FIG. A V-shaped groove 8c is formed. However, since the protruding height and width of the annular blade 30a of the lower roller 30 of the second roller pair 18 are the same as those of the lower roller 29 of the first roller pair 17, the lower surface of the strip material 8 The V-shaped groove 8b formed in the second roller pair 18 is not enlarged and is kept the same size as when the first roller pair passes.

Finally, when the strip material 8 is passed through the third roller pair 19, the protruding height and width of the annular blade 31a of the lower roller 31 of the third roller pair 19 are equal to those of the lower roller 30 of the second roller pair 18. Because it is larger than the strip material 8
The V-shaped groove 8b on the lower surface is enlarged and formed by the annular blade 31a of the lower roller 31 of the third roller pair 19, and the thinned portion 8e of the groove bottom of the V-shaped grooves 8b and 8c is formed by the annular blade 31a. It is cut off at the tip. In this case, the upper roller 28 of the third roller pair 19
Since the protruding height and width of the annular blade 28a are smaller than those of the annular blade 27a of the upper roller 27 of the second roller pair 18, the formation of the V-shaped groove on the upper surface of the strip material 8 is not possible in the third roller pair 19. Not done.

In the method of the present invention and the cutting device of the present invention, the strip material is not cut by applying a huge shearing force at once, but the thinned part of the groove bottom is sheared by force, so that the cut surface is A beautiful and neat cut surface can be obtained without burrs or sagging. In particular, in the method of the present invention, a groove with a V-shaped cross-section is formed along the cutting line using an annular blade or a collar-shaped projection (or wheel-shaped presser) having a cutting edge with a V-shaped cross-section before cutting. When cutting a laminate having a coating layer, there is no fear that the surface coating layer will peel off, and the laminate can be cut cleanly.

FIG. 8 shows a small strip 9A obtained by cutting a strip material having a laminated structure consisting of a rust-proof plated backing layer and a covering layer such as a porous sintered metal layer using the method and cutting device of the present invention. As shown in the figure, the strip-shaped body 9A obtained by applying the method of the present invention has side edges (side edges) inclined in a chamfered manner, and peeling between the backing metal layer 13 and the covering layer 12 is prevented. It has not occurred at all,
Furthermore, no sagging or burrs were generated. Moreover, in the groove carving process before cutting, the coating layer 12 is removed from the back metal layer 1.
3 to form a V-shaped groove, the coating layer 12A on the surface of the side edge is strongly pressed against the back metal layer, forming a side edge in which the coating layer 12A and the back metal layer 13 are in close contact. Therefore, in such a strip-shaped body 9A, since the back metal layer is covered with the coating layer 12A even in the side edge portions, there is no fear that the back metal layer will rust, and by using the strip-shaped body 9A, there is no risk of the back metal layer rusting. Therefore, bearings with good quality and dimensional accuracy can be manufactured.

As described above, in the present invention, as shown in FIG. 8, it is possible to obtain a small band-like body 9A whose side edges are inclined in a chamfered or wedge-shaped manner and whose side edges are covered with a coating layer. Furthermore, when the strip-shaped body 9A is cut from a wide strip-shaped material, no sagging or burrs are produced on the cut surface, and a strip-shaped body having beautiful side edges can be obtained.

In the above embodiment, each roller and the annular blade were formed integrally, but as shown in FIG. 9, an annular blade 44 or a disc blade formed separately from the cylindrical portion of the roller may be assembled into the roller at the time of roller assembly. By manufacturing the cylindrical portion of the roller and the annular blade separately, it is possible to use a superhard material such as powdered diamond or powdered alloy for the annular blade, and it is easier to manufacture rollers of various designs than with an integrated roller. becomes, and
A high-performance, inexpensive device can be manufactured. In addition, when forming the annular blade 44 as shown in FIG. 9, by setting the cutting edge angle θ to 15° to 70° and rounding the root portion 44a of the blade, the coating layer can be bent softly when cutting the laminate. This increases the effect of preventing peeling of the coating layer. Furthermore, the annular blade 44
If one with a pointed tip consisting of two concave surfaces is used as the
Chamfering can be applied.

Effects of the Invention The present invention provides that after locally thinning the strip material,
Since the thinned portion is sheared, a beautiful cut surface can be obtained without causing burrs or sagging on the cut surface, and no scrap material is generated.

The present invention creates a coating layer by carving grooves with a V-shaped cross section at opposing positions on both sides of a strip using a rotary tool equipped with a wedge-shaped or V-shaped cutting edge on the outer periphery. is strongly pressed against the backing metal layer, and a side edge is formed in which the covering layer and the backing metal layer are in close contact with each other, so that the covering layer does not peel off.

[Brief explanation of drawings]

FIG. 1 is a side view showing a cutting device for carrying out the method of the present invention, and FIGS. 2 to 4 are -,
- and - arrow view, 5th
7 are enlarged views of the parts indicated by , , in FIGS. 2 to 4, FIG. 8 is a cross-sectional view of the frenulum obtained by the method of the present invention, and FIG. A vertical cross-sectional view of an annular blade that can be used in the device shown in the figure, FIG. 10 is an explanatory diagram of a conventional roller-type slitter, and FIG. 11 is a cross-sectional view of a small strip obtained by a conventional roller-type slitter. It is. 8...Strip-shaped material, 9,9A...Strip-shaped body, 10...
...Flash, 11... Sagging, 12... Covering layer, 13...
...Backing metal layer, 14...Peeling, 16...Frame, 1
7...First roller pair, 18...Second roller pair, 19...Third roller pair, 20, 21...Bearing box, 22, 23...Elevating screw, 24, 25...
Operation handle, 26~28... Upper roller, 29~
31...lower roller, 26a-31a...annular blade,
44...Annular blade.

Claims (1)

[Claims] 1. A strip material made of two or more layers of different materials is rolled and moved in the longitudinal direction, and a cutting edge with a wedge-shaped or V-shaped cross section is formed on the outer periphery. a step of carving grooves having a substantially V-shaped cross section parallel to the longitudinal direction of the strip material at opposing positions on both surfaces of the strip material using a rotary tool provided with the strip material; One of the grooves having a V-shaped cross-section is formed into a wide and deep V-shaped cross-section by a rotary tool having a cutting edge wider and higher on the outer periphery than the wedge-shaped or V-shaped cutting edge of the rotary tool. A step of forming a groove in the shape of a groove, and forming a groove on the opposite side to the groove formed in the wide and deep V-shaped cross section to a wide width using a rotary tool having a wide and high cutting edge on the outer periphery, similar to the above process. The process consists of forming a groove with a deep V-shaped cross-section, and cutting the thin uncut portion remaining at the bottom of the groove with the rotary tool, and forming a groove with a wedge-shaped or V-shaped cross-section on the side edge. 1. A method for cutting a strip material, the method comprising dividing the strip material into at least one small strip material each having a surface portion. 2 A pair of rollers is constituted by two rollers arranged close to each other in parallel, and at least three pairs of rollers are arranged in tandem, and the space between the rollers of each pair of rollers is used as a passageway in the longitudinal direction of the strip material. , a rolling mill-type cutting device that moves and cuts a strip material formed by laminating two or more layers of different materials in the plate passage while rolling it in the plate passage, the roller A pair of wedge-shaped or V-shaped cross-sectional grooves are formed on the outer periphery of the strip to form grooves extending parallel to the longitudinal direction of the strip and having a substantially V-shaped cross-section at opposing positions on both sides of the strip. A first pair of rollers with cutting edges and a wedge-shaped or V-shaped cross section on the outer periphery to form one groove of the V-shaped cross-sectional shape on both sides of the strip material into a wide and deep groove. a second roller pair consisting of a roller having a wider and higher cutting edge than the shaped cutting edge, and a roller having the same cutting edge as the wedge-shaped or V-shaped cross-sectional cutting edge on the outer periphery; wide deep V
In order to form a wide and deep groove on the opposite side to the groove formed in the shaped cross-section, and to cut the thin uncut portion remaining at the bottom of the groove, the wedge-shaped or V-shaped cross-section is formed on the outer periphery. A third pair of rollers consisting of a roller having a cutting edge wider and higher than the cutting edge, and a roller having the same cutting edge as the wedge-shaped or V-shaped cross-sectional edge on the outer periphery. Features: Cutting device for strip material.