JP2727711B2 - Flat chain - Google Patents

Description

The present invention relates to a flat chain body used as, for example, a base of a cutting tool, a power transmission chain, or the like.

"Prior art" As an application example of the present invention, the above cutting tool will be described.

In the case of cutting a large work material such as a stone, a cutting blade, a band saw, a wire saw and the like are generally used.

The cutting blade has a diamond abrasive grain layer chip fixed at equal intervals on the outer periphery of a disk-shaped base metal, and when the diameter is increased, the thickness of the base metal is inevitably increased due to the demand for strength. However, the thickness of the abrasive grain layer chip increases accordingly. For this reason, the cutting allowance becomes large, the yield of the work material is deteriorated, and the cutting edge is run-out due to an increase in cutting resistance,
There was a disadvantage that the cutting accuracy was reduced.

In addition, the band saw is a wide band-shaped thin metal plate having a thickness of about 1 to 6 mm, which is welded endlessly, and an abrasive layer chip is fixed to one side edge thereof at equal intervals, and a pair arranged in the same horizontal plane. Is wound between pulleys that are rotated at a high speed, and stones and the like are cut by the straight portions between these pulleys. However, the bad saw has a drawback that metal stress occurs in the base metal as the bad saw is used, since the stress repeatedly acts on the curved portion around which the pulley is wound, and the life until the fracture is short.

In addition, the wire saw is an endless shape in which a cylindrical diamond abrasive layer chip is coaxially fixed at equal intervals on a stranded wire with a diameter of several mm to about 10 m, and is directly wound around the work material. The workpiece is cut at a high speed by applying a predetermined tension by a driving device. However, since the diameter of the abrasive layer chip used is large, the cutting allowance is large compared to cutting blades and band saws, and there is no action to restrict the cutting direction due to the structure, so the flatness and surface roughness of the cut surface Inferior.
Further, since a large bending stress is applied to the wire at both end portions of the abrasive grain layer chip at the time of cutting, there is a drawback that the life to the chip breakage and the wire breakage is short.

Therefore, the present inventors, as a completely new cutting tool that can solve each of the above problems, to form an endless chain body by rotatably connecting a number of flat flaps in the same plane as the flaps, We are studying a chain cutter in which a cutting blade is fixed to one end surface of at least a part of a flap.

[Problems to be Solved by the Invention] However, a particular problem in manufacturing such a chain cutter is a connection structure of each flap, which is generally considered, for example, by rotating an end of the flap with a through pin. In such a structure as possible connection, it is difficult to secure sufficient connection strength because the thickness of the flap is small. Further, in this type of chain, wear of the flap connecting portion is inevitable. However, if the flap connecting portion is connected by a pin or the like as described above, it is difficult to replace the worn flap. Was an important issue.

"Means for solving the problem" The present invention has been made to solve the above problems,
A flat chain body in which a plurality of flat flaps are rotatably connected to each other in the same plane as the flaps, and the front end of the flap has a width in the left-right direction that increases forward and A substantially semi-circular connecting protrusion having an arc peripheral surface forming the same arc is formed on both sides, and an arc peripheral surface complementary to the arc peripheral surface of the connection convex portion is provided at a rear end of the flap. Is formed, and the connecting protrusion of each flap is fitted to the connecting recess of the adjacent flap with the respective arc peripheral surfaces in contact with each other, and a fixed angle in the same plane as the flap. It is characterized in that it is rotatable and cannot be detached from the connecting direction of the flap.

In addition, an engaging ridge and an engaging groove having mutually complementary cross-sectional shapes are formed on the respective arc peripheral surfaces of the connecting concave portion and the connecting convex portion. They may be irremovably connected in the thickness direction.

Further, each of the arcuate peripheral surfaces of the connection concave portion and the connection convex portion may be formed perpendicular to the back surface of the flap.

In addition, at the left or right end of the front end face and the rear end face of the flap, the chain body is engaged with each other in the thickness direction of the flap in a state where the chain body extends linearly and the chain body is bent. Engaging portions that are separated from each other may be formed.

Further, a sliding groove or a sliding ridge for a back plate extending parallel to a line connecting the centers of the connecting concave portion and the connecting convex portion may be formed on one of the left and right end surfaces of each flap.

Further, the flaps may be connected endlessly, or a cutting blade may be fixed to one of the left end face and the right end face of the flap.

[Operation] In this flat chain body and its driving structure, a connecting concave portion and a connecting convex portion are formed at the front and rear ends of each flap, respectively, and these are fitted and connected, so that the thickness of the flap is increased. Even if the thickness is small, a large sliding area of the connecting portion can be ensured, and sufficient connecting strength and tensile strength can be obtained.

Further, since the shape of the connecting projection is substantially semicircular, the left and right side edges form the same arc, and the center of these arcs is located in front of the flap. Even when the area (sliding area) of each arc peripheral surface of the concave portion is large, the amount of protrusion of the connecting convex portion and the depth of the connecting concave portion can be relatively small. Therefore, for example, the size of the flap in the connecting direction can be reduced as compared with the case where these shapes are disc-shaped, and the strength of the connecting notch is increased by the small depth of the connecting concave portion. The connection strength can be improved.

Embodiment FIG. 1 and FIG. 2 are a partial front view and a cross-sectional view taken along line II-II of an outer peripheral edge type chain cutter as a first embodiment of a flat chain body according to the present invention.

This outer peripheral blade type chain cutter is formed by connecting a large number of metal flaps 1 having a constant thickness and a rectangular shape so as to be rotatable only in the same plane as the flaps 1 and having an endless chain body 2.
Further, abrasive grains segments (cutting blades) 4 are fixed to the end face on the outer peripheral side of each flap 1, respectively, and the driven concave portions 6A and 6B are formed on the inner peripheral side of each flap 1. .

Flap 1 is made of SK steel, stainless steel, SKD steel, SUP steel,
It is formed from SNCM steel or the like and has a hardness of 30 to 65 HRc by quenching or the like. If it is less than HRc30, sufficient strength cannot be obtained, and if it is greater than HRc65, molding becomes difficult.

The dimensions of the flap 1 vary depending on the use of the chain cutter. For example, in the case of ordinary large stone cutting, the thickness is about 2 to 6 mm, the height H is about 50 to 150 mm, and the width W is 40 to 100 m.
m. With the dimensions in this range, sufficient tensile strength and cutting performance as a large stone cutter can be obtained. The inner peripheral end face and the outer peripheral end face of the flap 1 are parallel to each other.

Next, a connection structure of the flap 1 will be described. As shown in FIG. 3, each flap 1 has a semi-disc-like connection in which the width in the left-right direction increases toward the front at the center of the side surface on the front side in the rotation direction, flush with the surface of the flap 1. The projection 8 is integrally formed. Peripheral surfaces 8A, 8B on both side edges of connecting projection 8
Have the same arc with the same center, and the central angle α between the ends of the respective arc peripheral surfaces 8A and 8B is set to 120 ° or more. If the angle is smaller than 120 °, the connection strength between the connection notch 10 and the connection protrusion 8 described below decreases.

In addition, the arc-shaped peripheral surfaces 8A and 8B of the connecting projection 8 and the end faces of the straight portions are all formed perpendicular to the front and back surfaces of the flap, and both edges of the constricted portion 8C of the connecting projection 8 are 3
As shown in the figure, in order to prevent stress concentration, each is formed in an arc shape.

On the other hand, on the side surface on the rear side in the rotation direction of the flap 1, a semicircular connection notch having a slightly larger diameter than the connection projection 8 and having arcuate peripheral surfaces 10 </ b> A and 10 </ b> B corresponding to the connection projection 8. A (connection concave portion) 10 is formed, and a line connecting the center O1 of the connecting convex portion 8 and the center O2 of the connecting notch portion 10 is set in parallel with the outer peripheral end surface and the inner peripheral end surface of the flap 1 respectively. Have been. Also, both side portions 10C of the opening of the connection notch 10 are:
It is chamfered in an arc shape having a smaller radius of curvature than the constricted portion 8C.

The center angle γ (see FIG. 3) between both ends of the arc-shaped peripheral surfaces 10A and 10B of the connecting notch 10 is 60 to 150 °, preferably 90 to 120 °, and the connecting notch is larger than 150 °. The locking force of the connecting projection 8 by the portion 10 is small, and the connecting strength is reduced. Also
If it is smaller than 60 °, the width between the constricted portions 8C of the connecting projections 8 becomes small, and the tensile strength at this portion decreases.

On the other hand, the central angle β between the constricted surfaces of the connecting projection 8 is
In order that the connecting projection 8 can rotate within the connecting notch 10,
It is formed smaller than the central angle γ by a certain angle.

The end face of the straight portion of the connecting notch 10 has an angle from the center line O1-O2 on the outer circumferential side parallel to the end face of the straight portion of the connecting convex portion 8, and an angle greater than the sprocket angle S on the inner circumferential side from the center line O1-O2. It is bent forward by θ, so that the connecting projection 8 is rotatable in the connecting recess 10 toward θ ゜ inward. The distance L2 from the center O2 of the connection notch 10 to the extension of the side surface of the flap is smaller than the distance L1 from the communication O1 of the connection protrusion to the side surface of the flap.

In the flap connection state, there is a slight gap between the notch 10 for connection and each straight portion parallel to each other of the protrusion 8 for connection. However, by inserting a gap gauge or the like into this gap, the both are cut off. The amount of wear on the sliding surface can be determined, and can be used as an indication of the life of the flap 1.

Next, the fixing structure of the abrasive grain segment 4 will be described. An elliptical arc-shaped segment mounting concave portion 18 is formed in the end surface of each flap 1 on the chain outer peripheral side at a position deviated from the center of the end surface to the front side in the rotation direction. The inner peripheral surface of the segment mounting concave portion 18 has a concave V over its entire length.
It is shaped like a letter.

A narrow slit 22 is formed in the mounting recess 18 at one end thereof and opens at a front portion in the rotation direction of the mounting recess 18. A rectangular jig insertion hole long in the longitudinal direction of the slit 22 is formed at the center thereof. 20 is formed, and a circular hole 24 for stress relaxation is formed at the end of the slit 22. The elongated portion cut off by the slit 22 is an elastic locking piece 26. When the elastic locking piece 26 is bent forward in the rotational direction, the abrasive grain segment 4 can be attached and detached.

On the other hand, the abrasive grain segment 4 includes a metal chip support 28 having the same thickness as the flap 1 and a metal, and a rectangular parallelepiped abrasive layer chip 30 fixed to an end face of the chip support 28.

The thickness of the abrasive layer chip 30 is 0.5 to 4 than that of the chip support 28.
mm thick. If it is smaller than 0.5 mm, the chip support 28 and the flap 1 may rub against the cut surface of the work material, and if it is larger than 4 mm, the cutting margin becomes large and the yield is reduced more than necessary. The length of the abrasive grain layer chip 30 is equal to the length of the chip support 28, and is slightly shorter than the outer peripheral end surface of the flap 1, and is about 20 to 70 mm.

The abrasive layer chip 30 is a metal bond abrasive layer containing superabrasive particles such as diamond or CBN, and is brazed to the chip support 28, integrally sintered, laser welded, fixed by means such as electron beam welding. I have. The grain size, concentration and thickness of the abrasive grains should be determined according to the use of the outer edge type chain cutter.

An elliptic plate-shaped projection 28A having a shape complementary to the mounting recess 18 is formed integrally with the chip support 28, and the peripheral surface thereof has a convex V-shaped cross section. The projection 28A can be fitted into the segment mounting recess 18 with the elastic locking piece 26 expanded, and is firmly locked when the elastic locking piece 26 is returned.

Next, the flap deflection preventing structure will be described. Both side surfaces of each flap 1 are parallel to each other at a portion on the outer peripheral side of the connecting notch 10 and the connecting convex portion 8, and the front side in the rotation direction has a constant width along the widthwise center of the side surface. An engagement protrusion 38 having a thick rectangular plate shape is formed.

An engagement groove 40 whose width is slightly larger than the thickness of the engagement protrusion 38 is formed along the center line on the inner peripheral side of the side surface on the rear side in the rotation direction of the flap 1, and the engagement groove 40 of the adjacent flap 1 is formed. The mating projection 38 and the engaging groove 40 are fitted without gaps so that the flaps 1 cannot move in the thickness direction in a state where the flaps 1 are arranged in a straight line, and are separated from each other in a state where the chain body 2 is bent. It is set as follows.

Next, the driven concave portions 6A and 6B will be described. These driven concave portions 6A and 6B are arc-shaped ones formed on the inner circumferential side of each flap 1 at the front and rear corners in the rotation direction.

The radius of curvature of the driven recesses 6A, 6B is equal to the radius of a pin 126 fixed to the outer periphery of a sprocket 88, 112 of a cutting device described later, as shown in FIG.
The portion from to the inner peripheral end face of the flap is chamfered into a smooth curved surface.

The distance between the centers of curvature of the driven concave portions 6A and 6B in the same flap 1 is equal to the center distance of the pin 126,
In a state where the flap 1 is wound around the outer circumferences of the sprockets 88 and 112, the driven concave portions 6A and 6B of the adjacent flaps 1 form the same circular arc surface, and the pin 126 is fitted to the circular arc surface without rattling. Is set.

Next, a slide groove for a back plate, which will be described later, will be described. A sliding groove 42 having a U-shaped cross section is formed on the inner peripheral end face of each flap 1 along the center line over the entire length of the end face. The bottom surface of the sliding groove 42 is parallel to a line connecting the center of the connection notch 10 and the center of the connection protrusion 8. The width of the sliding groove 42 is desirably about 30 to 50% of the flap thickness in view of its strength. In addition, the depth of the sliding groove 42 is
The locking force of the flap 1 in the thickness direction by 118 should be set to be sufficiently large, and specifically, about 50 to 200% of the flap thickness is preferable.

Next, referring to FIGS. 9 and 10, a description will be given of a cutting device using the outer peripheral edge type chain cutter having the above-described configuration. FIG. 9 is a front view of the apparatus, and FIG. 10 is a partially cutaway plan view. The upper, lower, left and right used in the following description are based on FIG.

In the figure, reference numeral 50 denotes a pair of circular arcs which are erected at an interval on the floor surface, and each of these cylinders 50 is provided with a rectangular tubular base 54A via a key 52 extending in a vertical direction as shown in FIG.
(Left) and 54B (Right) are mounted at the same height so that they can move up and down and cannot rotate around the axis.

A top plate 56 is horizontally fixed to the upper end of the column 50. An elevating motor 58 is attached to the left end of the top plate 56. The motor 58 rotates a screw shaft 60 arranged along the back surface of the left column 50 via a gear box (not shown). And on this screw shaft 60,
An elevating member 62 fixed to the back surface of the left base 54A is screwed.

On the other hand, a gear box 64 is fixed to the right end of the top plate 56, and a rotating shaft 66 is hung between the gear box 64 and the gear box, so that the power of the motor 58 is transmitted to the gear box.
Also transmitted to 64. The output shaft of the gear box 64 is connected to a screw shaft 68 arranged along the back surface of the right column 50, and an elevating member 70 fixed to the back surface of the right base 54B is screwed to the screw shaft 68. . Thus, when the elevating motor 58 is operated, the two bases 54A and 54B move up and down at a low speed while always maintaining the same height.

An annular groove 72 and a disk portion 74 centering on the center of the front surface are formed in the front portion of the left base 54A. Further, a tilting plate 76 is arranged along the front surface of the circular plate portion 74, and claw portions 76A formed on both sides of the tilting plate 76 are engaged with both sides of the annular groove 72, and the claw is formed in the annular groove 72. By sliding the portion 76A, the tilting plate 76 rotates coaxially with the disk portion 74.

On the front surface of the tilting plate 76, a rectangular guide rail portion 78 extending in the left-right direction is formed. An L-shaped plate support plate 80 whose right end is bent forward is attached to the guide rail portion 78 so as to move in the left-right direction, and is pulled to the left by a biasing mechanism (not shown) with a constant force.

In the center of the front surface of the tilting plate 76, a shaft portion 82 projecting forward is provided.
The shaft portion 82 projects forward through an elongated hole 84 formed in the plate support plate 80 and extending in the left-right direction. A pulley 86 and a sprocket 88 coaxially connected to each other are rotatably supported by the shaft portion.

On the other hand, a drive motor (main part of the drive mechanism) 92 is mounted on the left side surface of the left base 54A forwardly via a height-adjustable mounting plate 90. A pulley 94 is fixed to the rotation shaft of the drive motor 92, and the pulley 94 and the pulley 86 are fixed.
Between them, a belt 96 is wound. The tension of the belt 96 can be adjusted by moving the mounting plate 90 up and down.

On the other hand, a pair of vertically extending arc grooves 98 and an arc plate portion 100 having a constant width are formed on the front portion of the right base 54B. It has an arc shape centered on the heart.

On the front surface of the arc plate portion 100, a plate support plate 102 is arranged along this surface, and claw portions 104 formed on both sides of the plate support plate 102 are inserted into the respective arc grooves 98,
The plate supporting plate 102 can be tilted by 5 ° or more around the left sprocket 88 along the arc plate portion 100.
If the tilt angle is less than 5 °, it becomes difficult to start cutting into the work material W.

A slide rail portion 106 extending in the left-right direction is formed on the front surface of the plate support plate 102, and the slide rail portion 106
, A pulley mounting plate 108 is mounted movably in the left-right direction. At the center of the front of the pulley mounting plate 108, a shaft 110
The driven sprocket 112 is rotatably attached to the shaft 110 via a bearing. A hydraulic cylinder 114 is fixed to the right end surface of the plate support plate 102 to the left, and its rod is connected to a pulley mounting plate 108.

An operation panel 116 is fixed to the right side surface of the right base 54B, and the operation panel 116 controls energization to each part.

The left end of the plate support plate 102 is bent forward in an L-shape, and a sprocket is provided between the plate support plate 102 and the right plate support plate 80.
A rectangular back plate 118 is stretched on the same plane as 88 and 112. This back plate 118 is made of SUP steel, SNCM
It is made of a material such as steel, SKD steel, SK steel, and stainless steel, and has the same thickness as the flap 1. Also, back plate 11
The width of 8 is made equal to the winding diameter of the chain cutter C by the sprockets 88 and 112. In addition, back plate 11
At the upper and lower edges of 8, a U-shaped ridge (not shown) complementary to the sliding groove 42 formed on the inner peripheral side of the chain cutter C is formed over the entire length. .

A chain cutter C is wound between the sprockets 88 and 112. In the linear portion between the sprockets 88 and 112, the ridges formed at the upper and lower ends of the back plate 118 are slidable in the sliding grooves 42 of each flap 1 respectively. Inlaid.

As shown in FIG. 2, each of the sprockets 88 and 112 is formed by laminating a pair of disks 120 and 122, and the outer diameter thereof is set to a value reaching the center of the connecting projection 8 of the wound chain cutter C. I have. A slit 124 having an opening width slightly larger than the thickness of the flap 1 is formed in the outer peripheral portion of the opposing surfaces of the discs 120 and 122. Inside the slit 124, only the winding radius of the chain cutter C from the center of the srocket is set. Cylinder pins 126 made of cemented carbide are vertically fitted at equal positions in the circumferential direction at distant positions. The sprocket angle S is the central angle between the adjacent pins 126 and the center of the sprocket.

On the other hand, a shallow drain groove 128 extending in the front-rear direction is formed between the two columns 50 on the floor surface, and a pair of guide rails 130 are installed in parallel at the center of the drain groove 128. A work table 134 having two pairs of wheels 132 on its lower surface is mounted on these guide rails 130. Further, pulling wires 136 connected to a driver (not shown) are provided at front and rear ends of the table 134.
Are connected, and the table 134 can be moved along the guide rail 130.

Now, in order to perform cutting with the chain cutter C using the above apparatus, first, the lifting / lowering motor 58 is operated and the bases 54A, 54
While raising B, the work material W such as a stone material placed on the table 134 is positioned in the front-rear direction.

Next, the plate support plate 102 is lowered along the arc plate portion 100, and the entire chain cutter C and the back plate 118 are tilted and fixed at this lowered position. Further, the left plate support plate 80 is urged to the left to apply an appropriate tension to the back plate 118, and the hydraulic cylinder 114 is operated to pull the pulley mounting plate 108 to the right to properly adjust the tension of the chain cutter C. Keep at the value.

In this state, the drive motor 92 is operated, and the chain cutter C
While rotating in the direction of the arrow in the figure, the elevating motor 58 is operated to lower the entire chain cutter C at a predetermined cutting speed, and cut into the work material W from the lower right side. When the cutting depth reaches a certain level, the plate support plate 102
Is pulled up along the arcuate plate 100, the chain cutter C is returned to the horizontal position and fixed, and the cutting is continued to the lower end of the workpiece W.

According to the above-described chain cutter C, the following excellent effects can be obtained.

Since the connecting projection 8 and the connecting notch 10 formed to have the same thickness as the flap 1 are fitted to each other to connect the flaps 1, even the flap 1 having a relatively small thickness can be slid sufficiently. A moving area can be secured, and a high connection strength and high tensile strength can be obtained. Therefore, since the thickness of the flap 1 is small, the thickness of the abrasive grain layer chip 30 can be smaller than that of a conventional large-diameter cutting blade or wire saw, and the cutting margin can be greatly reduced, and the yield of the work material W can be reduced. Improvement can be achieved.

Since the shape of the connecting projection 8 and the connecting notch 10 is semicircular, each of these circular arc peripheral surfaces 8A, 8B, 10A, 10B
When the area (sliding area) is large, the projecting amount of the connecting projection 8 and the depth of the connecting notch 10 can be relatively small. Therefore, for example, as compared with the case where these shapes are disc-shaped, the width dimension W of the flap 1 in the connection direction can be reduced, and the depth of the connection notch 10 is small,
The flap connection strength can be improved by increasing the deformation resistance of the connection notch 10.

Slit 124 in the part wound around sprockets 88 and 112
Each flap 1 is supported in the thickness direction by both side walls, while the ridge of the back plate 118 is fitted into the sliding groove 42 of each flap 1 in the linear portion of the chain to regulate the position of each flap 1 in the thickness direction. Since each peripheral surface of the coupling notch 10 and the coupling convex portion 8 is a peripheral surface perpendicular to the front and back surfaces of the flap,
Despite the fact that the flaps 1 are not disconnected or run out during cutting, the back plate 118 or the sprocket 8
When disengagement with 8,112, each flap 1 can be easily separated in the thickness direction. Therefore, replacement of the worn flap 1 and change of the length of the chain body 2 can be performed extremely easily and quickly.

The individual flaps 1 are small and all have the same shape, and the connection notch 10 and the connection projection 8 whose vertical surfaces are perpendicular can be formed with high precision by a relatively simple processing method. Easy. In addition, since a separate member is not required for connecting the flap 1, the manufacturing cost of the entire chain cutter C is low.

Since the connecting portion of the flap 1 is flush, chips and the like hardly stay here, and the slidability of the connecting portion is hardly hindered by the chips even after long use.

Simply increase or decrease the number of connected flaps 1 and chain C
Since the length of the workpiece can be set freely, the size of the work material that can be cut is not limited, and an extremely large work material can be efficiently cut.

Since the abrasive grain segment 4 is detachably fixed to the flap 1, when the abrasive grain layer chip 30 is worn, the abrasive grain segment 4 is replaced at the curved portion of the chain C while being attached to the sprockets 88 and 112. The chain body 2 can be reused, and the cutting cost can be reduced.

In the straight chain portion for cutting, the engaging grooves 38 formed on both side surfaces of the flap 1 engage with the engaging ridges 40, and each flap 1 is fixed in a single plate shape.
The deflection in the thickness direction does not occur, and the cutting accuracy can be improved from this point as well. Moreover, the slit of each flap 1 in the straight part
Since the opening 22 is not opened, there is no possibility that the abrasive grain segment 4 being cut off will fall off.

The flap 1 and / or the main part of the cutting device may be subjected to the following surface treatment to improve the corrosion resistance and the wear resistance.

(A) One or more materials selected from carbides such as TiC, nitrides such as TiN, borides such as BN, oxides such as Al ₂ O ₃ , diamond, etc., are subjected to ion plating, PVD
The entire surface or the sliding surface of the flap 1 is coated by using any one of a method, a CVD method and the like. Here, the sliding surface is defined as each arc peripheral surface of the connecting projection 8 and the connecting notch 10.
8A, 8B, 10A, 10B, the inner surfaces of the driven concave portions 6A, 6B, the inner surfaces of the sliding grooves 42, the projections of the back plate 118, the outer peripheral surfaces of the pins 126, and the like.

(B) An abrasion-resistant material coating layer such as a ceramic or a cobalt alloy is formed on the entire surface or the sliding surface of the flap 1 by using powder plasma overlay or overlay welding.

(C) A thin plate or the like having high wear resistance made of cemented carbide, high-strength ceramic, or the like is fixed to the inner surface of the sliding groove 42 and / or the end surface of the back plate 118 by brazing or crimping. Fix it. If possible, it may be fixed to another sliding surface.

(D) Kanigen plating, hard chrome plating, nickel plating or the like is applied to the entire surface or the sliding surface of the flap 1.

(E) Nitriding or carburizing is applied to the entire surface or the sliding surface of the flap 1 in a vacuum heat treatment furnace or the like.

FIG. 5 shows a second embodiment of the present invention, which is characterized in that each of the flap 1 and the chip support 28 has a three-layer structure.

The flap 1 is formed by joining a pair of outer plates 1A, 1C and an inner plate 1B formed by punching or the like into three layers by spot welding or the like. The shape of the inner plates 1A, 1C and the outer plate 1B is determined. By making them partially different, the engagement ridge 38 shown in FIG.
The engagement groove 40, the back plate slide groove 42, and the groove 18A of the segment mounting recess 18 are formed respectively.

Similarly, the chip support 28 is formed by joining the outer plates 28A and 28C and the inner plate 28B into three layers, and by projecting the end of the inner plate 28B, the peripheral ridge having a convex cross section of the mounting protrusion 28A is formed. Are formed.

According to this example, since the flap 1 and the chip support 28 have a three-layer structure, a thin metal plate is simply punched and spot-welded to form the back plate sliding groove 4.
2. The engagement protrusion condition 38, the engagement groove 40, and the groove 18A can be formed easily and with high precision, and the productivity and processing cost can be reduced as compared with the above-described configuration in which these are formed by grinding. .

Further, since the depths of the grooves 38 and 42 and the protrusion amount of the ridges 40 can be secured large, there is an advantage that the effect of preventing the flap 1 from oscillating can be increased accordingly.

FIGS. 6 and 7 show a third embodiment of the present invention.
The present invention is characterized in that the mounting projections 152 are formed on the flap 1 while the 0 and the slit 22 are formed.

Further, in this example, an engagement groove 154 extending along the thickness center line is formed on the outer peripheral end surface of the linear portion of the connection protrusion 8, and the engagement notch 10 of the connection groove 10 corresponding to the engagement groove 154 is formed. An engagement ridge 156 having a cross section complementary to the engagement groove 154 is formed on the end face.

According to this example, even if the elastic locking piece 26 is broken or deformed, the flap 1 is not affected at all and only the abrasive grain segments 4 need to be replaced. Can be extended.

Further, when the chain cutter C extends linearly, the engaging groove 154 of each flap 1 and the engaging ridge 156 are fitted, so that the effect of preventing the flap 1 from swinging in the thickness direction can be obtained.
Therefore, in some cases, a configuration in which the engagement groove 40 for preventing vibration and the engagement ridge 38 are eliminated is also possible. Of course, also in this example, a three-layer structure can be used as shown in FIG.

Next, FIGS. 11 to 14 show a fourth embodiment of the present invention. In this embodiment, each of the connecting convex portions 8 and the connecting notch portions 10 has a circular arc surface movement 8A, 8B, 10A, 10B. A ridge 160 and a groove 162 having a V-shaped cross section complementary to each other are formed, and these are fitted so as to be slidable and immovable in the thickness direction of the flap 1.

Similarly, as shown in FIG. 11, when the flaps 1 are linearly arranged, the rotatable angle θ of the connecting projection 8 in the connecting notch 10 is set to be larger than the sprocket angle S. , And a notch for connection as shown in FIG.
The extension of the inner peripheral side end face 10D of 10 is set so as to be in contact with the outer peripheral side end face 10C of the connection notch 10.

Further, in this example, the mounting projections 28 of the chip support 28 are provided.
A and the shape of the mounting recess 18 of the flap 1 are formed in a shape in which a pair of arcs are connected by a straight line. With this shape, there is an advantage that the mounting recess 18 can be easily processed by an end mill.

According to the fourth embodiment, the flaps 1 cannot be detached from each other in the thickness direction by the engagement of the ridges 160 and the grooves 162.
Difficult to fall apart and easy to handle.

On the other hand, when exchanging the flap 1, the connecting projection 8 is removed from the connecting notch 10 in the direction of the arrow by bending the chain cutter C to the inner peripheral side as much as possible as shown in FIG. The flap 1 can be replaced easily and quickly.

In this embodiment, the flap 1 can have a three-layer structure as shown in FIG.

17 to 20 show a fifth embodiment of the present invention. In this embodiment, as shown in FIG. 19, the projecting amount L of the connecting projection 8 is set to a length that does not reach the center O1. The projections 160 are formed on the arcuate peripheral surfaces 8A and 8B, while the grooves 162 are formed on the arcuate peripheral surfaces 10A and 10B of the connection notch 10 only in a portion having a predetermined length from the opening edge.

Then, as shown in FIG. 22, by shortening the connection length of each flap 1, the dimensions of each part are adjusted so that the engagement between the ridge 160 and the groove 162 is released and each flap 1 can be detached in the thickness direction. Is set.

According to this example, when tension is applied to each of the flaps 1 such as when the chain cutter C is used, transported, or attached to the cutting device, regardless of the connection angle of each flap 1,
There is no disconnection between the flaps 1. But once,
When the chain cutter C is contracted, there is an advantage that each flap 1 can be easily separated.

In this example, the flap 1 may have a three-layer structure as shown in FIG.

Further, in the above-described embodiment, the distal end face of the connecting projection 8 is set behind the arc center O1.
It is also possible to set more forward. In that case,
The depth of the connection notch 10 may be increased to provide a space in which the connection protrusion 8 can be displaced forward in the connection notch 10.

Next, FIGS. 23 to 26 show a sixth embodiment of the present invention.

In this example, as shown in FIGS. 25 and 26, before the flaps are connected, the arc-shaped peripheral surfaces 10A, 10A of the connection notch 10 are connected.
B is a tapered surface 170 complementary to the cross-sectional shape of the ridge 160 formed on the arcuate peripheral surfaces 8A and 8B of the connecting projection 8 only at the back side portion from the thickness center of the flap 1. A portion extending from the center to the surface side is a vertical surface 172.

In addition, on the flap surface side, in parallel with each vertical surface 172 of the notch 10 for connection, an arc-shaped caulking groove 1 is separated by about 0.5 to 3 mm.
74 are formed respectively. If it is more than 3 mm, the crimping work described later will be difficult, and if it is less than 0.5 mm, the crimping strength will be insufficient.

Then, the connecting projection 8 is fitted into the connecting notch 10 from the flap surface side, and each caulking groove 174 is pushed and extended over the entire length, and the inner protruding ridge 176 is deformed inward. As a result, as shown in FIG. 24, the connecting projection 8 is supported by the connecting notch 10 so as to be rotatable and cannot be detached in the flap thickness direction.

According to this example, once the chain cutter is assembled, the connecting projection 8 does not come off from the connecting notch 10 unless the ridge 176 is deformed. It is suitable for the case.

Next, FIGS. 27 and 28 show a seventh embodiment of the present invention. In this embodiment, the arc peripheral surfaces 8A and 8B of the connecting projection 8 and the arc peripheral surfaces 10A and 10B of the connecting notch 10 are shown. Are formed on spherical surfaces complementary to each other.

According to this configuration, the connecting portion of each flap 1 is slightly bent inward as shown in FIG. 27 to disengage the engagement ridge 38 and the engagement groove 40, and then each flap 1 is By twisting as shown in FIG. 28 (a sectional view taken along the line DD), the connecting projection 8 is easily separated from the connecting notch 10. Therefore, replacement of each flap 1 and adjustment of the chain length are easy.

In each of the above embodiments, the drive sprocket 88 is rotated to run the chain cutter C. However, the driven concave portions (6A, 6A) are formed on the inner peripheral end surface of the flap 1.
Instead of forming B), a configuration in which a through hole is formed in the center of each flap 1 may be adopted.

In this case, a chain cutter is wound around a pair of rotatable driven sprockets having the same slit as described above, and a pair of drive sprockets are provided so as to sandwich the linear portion of the chain cutter in the thickness direction of the flap. A drive pin is fixed to the outer peripheral surface of one drive sprocket at the same interval as the through hole, and by rotating each drive sprocket, the drive pin sequentially fits into the through hole of the flap and sends the flap, and the chain cutter is moved. To run. According to this configuration, the feature of the present invention that the depth of the connection notch 10 is small is effectively utilized.

In each of the above embodiments, the shape of the connecting projection was a simple semicircle, but if necessary, the arcuate peripheral surfaces 8A, 8B
The shape of the straight line portion excluding the above may be changed to a substantially semicircular shape changed to an arbitrary shape such as a convex arc shape or a concave arc shape. Further, it is also possible to change the shape of the straight portion of the connection notch 10 in response to the change.

In each of the above embodiments, the back plate sliding groove 42 is formed on the flap 1 and the ridge is formed on the back plate 118.
A sliding groove may be formed in the back plate 118.

If a cutting blade segment having a saw tooth or the like is attached to each flap 1 instead of the above-described abrasive grain segment 4,
The other configuration can be used for cutting wood and other work materials without any change, and a configuration in which the cutting blade tip is directly fixed to the flap 1 is also possible.

Further, various cutting blades may be fixed to the inner peripheral end of each flap 1 to form an inner peripheral blade type chain cutter. In this case, the chain cutter is wound around the outer peripheral surface of the work material and travels while applying tension to cut the work material.

Further, the flat chain body of the present invention can be used as, for example, a power transmission chain body in addition to the cutting tool described above.

[Effects of the Invention] As described above, according to the flat chain body according to the present invention, the connecting protrusion and the connecting recess are formed at the front and rear ends of each flap, respectively, and the connecting protrusion and the connecting protrusion are formed. Since the recesses are fitted to each other to connect the flaps, a sufficient sliding area can be ensured even with a relatively small-thickness flat flap, and high connection strength and tensile strength can be obtained.

In addition, the shape of the connecting projection is substantially semicircular, the left and right peripheral surfaces form the same arc, the left and right peripheral surfaces form the same arc as the left and right sides, and the width in the left and right direction is the front end side Therefore, even when the area (sliding area) of each arc peripheral surface of the connecting convex portion and the connecting concave portion is large, the projecting amount of the connecting convex portion and the connecting concave portion are large. The depth is relatively small. Therefore, for example, as compared with the case where these shapes are circular, the size of the flap connecting direction can be reduced in size, and the depth of the connecting concave portion is small, so that the strength of the connecting concave portion is increased to increase the flap connecting strength. Improvement can be achieved.

[Brief description of the drawings]

FIGS. 1 and 2 are a partial front view and a sectional view taken along the line II-II of an outer peripheral edge type chain cutter as a first embodiment of a flat chain body according to the present invention, and FIGS. Front view and left side view showing the flap of the same chain cutter. FIG. 5 is a side view of the flap according to the second embodiment of the present invention. FIGS. 6 and 7 are front views of the flap according to the third embodiment. 8 is a left side view of a modified example thereof, FIGS. 9 and 10 are front and partially cutaway plan views of a cutting device using the chain cutter, and FIGS. 11 and 12. The drawings are a partial front view and a cross-sectional view taken along line AA of the chain cutter of the fourth embodiment, FIGS. 13 and 14 are front views and left side views showing the flap, and FIG. 15 is a modification of the flap. FIG. 16 is a front view showing a method of attaching and detaching the flap, and FIG. FIGS. 18 and 18 are a partial front view and a sectional view taken along line BB of the chain cutter of the fifth embodiment, FIGS. 19 and 20 are front and left side views showing the flaps, and FIG. Fig. 22 is a left side view showing a modification of the flap, Fig. 22 is a front view showing a method of attaching and detaching the flap, Figs. 23 and 24 are partial front views and a cross-sectional view taken along line CC of the chain cutter of the sixth embodiment. FIGS. 25 and 26 are a front view and a left side view showing the flap, and FIGS. 27 and 28 are a partial front view and a sectional view taken along line DD of the chain cutter of the seventh embodiment. DESCRIPTION OF SYMBOLS 1 ... Flap, 2 ... Chain body, 4 ... Abrasive grain segment (cutting blade), 6A, 6B ... Driven concave part, 8 ... Connection convex part, 8A, 8B ... Arc peripheral surface, 10 ...... Connecting recess, 10A, 1
0B ... circular arc surface, 30 ... abrasive layer tip, 38 ... run-out preventing ridge, 40 ... run-out preventing engaging groove, 42 ... back plate sliding groove, 88 ... drive Sprocket, 112 …… Driving sprocket, 118 …… Back plate.

Claims (7)

(57) [Claims] 1. A flat chain body in which a plurality of flat flaps are rotatably connected in the same plane as the flaps, and the front end of the flap has a width in the left-right direction toward the front. A substantially semicircular connecting projection having an arc-shaped peripheral surface that forms the same arc is formed on the left and right sides thereof, and the rear end of the flap is complementary to the arc-shaped peripheral surface of the connecting convex. A connecting concave portion having a typical arc peripheral surface is formed, and the connecting convex portion of each flap is fitted to the connecting concave portion of another adjacent flap with the respective arc peripheral surfaces in contact with each other, and is identical to the flap. A flat chain body which is rotatable at a certain angle in a plane and cannot be detached from a connecting direction of a flap. 2. An engaging ridge and an engaging groove having mutually complementary cross-sectional shapes are formed on the respective arc peripheral surfaces of the connecting concave portion and the connecting convex portion. The flat chain body according to claim 1, wherein the flaps are connected so as not to be detachable in the thickness direction. 3. The flat chain body according to claim 1, wherein each of the arcuate peripheral surfaces of the connecting concave portion and the connecting convex portion is formed perpendicular to the front and back surfaces of the flap. . 4. A front end face and a rear end face of the flap are engaged with each other at a right or left end of the flap in a state where the chain body extends linearly so that the flaps cannot be detached in the thickness direction of the flap. 3. An engaging portion which is separated from each other in a bent state is formed.
Or the flat chain body according to 3. 5. A back plate sliding groove or a sliding ridge extending parallel to a line connecting the centers of the connecting concave portion and the connecting convex portion is formed on one of left and right end surfaces of each of the flaps. The flat chain body according to claim 1, 2, 3, or 4, wherein: 6. A flat chain body according to claim 1, wherein said flaps are connected endlessly. 7. A flat chain according to claim 1, wherein a cutting blade is fixed to one of a left end face and a right end face of the flap. body.