JPH06126529A - Saw hard tooth forming method and device thereof - Google Patents

Abstract

PURPOSE:To easily form saw teeth having a unique cutting ability of alloy on a band saw, circular saw, jigsaw, etc., eliminate the need of forming a saw set-relief angle at the time of grinding and shaping, and eliminate the loss of alloy-material. CONSTITUTION:With the saw tooth side turned up, the tip part of each saw tooth is sent to a welding position in sequence by a saw transfer device, a hard alloy bar-material is supplied above the saw tooth in the welding position by a bar-material supply device 2 so that it crosses the saw-face at right angles, the tip part of the bar-material is received by a saw set width adjusting device 3 in order for the saw set width of the bar-material to be adjusted, and the tip part of the bar-material is pressed on the saw tooth and welded by resistance welding by means of a welding device 4. Thereafter, the tip part of the bar- material is cut into a tip-like form almost at the same angle as the saw set- relief angle of the saw tooth by a cutter 5, and after the cutting, the bar- material is partly rotated for the tip part to be pressed on the following saw tooth. In the similar process, a hard alloy tip is provided on each saw tooth.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for forming a hard alloy cutting edge on a cutting edge of a band saw, a circular saw, a jigsaw or the like used for cutting wood, light alloys, plastics and the like.

[0002]

2. Description of the Related Art Conventionally, as a method of forming a hard alloy cutting edge on a cutting edge of a band saw, a circular saw, etc., a hard alloy tip is welded to the cutting edge by manual welding using an oxygen / acetylene torch, and then polished. A method of forming an alloy cutting edge by shaping with an or the like has been widely used.

[0003]

However, due to the shortage of skilled engineers required for manual welding in recent years and the demand for improving productivity, it is necessary to mechanize the buildup of the alloy cutting edge, and the TIG is required. Although automatic machines applying arc welding such as welding have been put to practical use, the hard alloy layer deposited by arc welding such as TIG welding does not oxidize due to atmospheric gas such as acetylene, but under unstable conditions. In many cases, it becomes an alloy having an incomplete structure because it is solidified after melting once. Therefore, there is a drawback that a cutting edge having the original cutting performance of the alloy cannot be formed. Further, when polishing and shaping the cutting edge, it is troublesome to form the relief angle at the left and right sides, and a large amount of alloy material is lost.

In view of the above problems, therefore, in the present invention, it is possible to easily form a cutting edge having the original cutting performance of the alloy, it is not necessary to form a relief angle at the time of polishing and shaping, and the loss of alloy material is eliminated. The present invention provides a method of forming a cutting edge of a saw and an apparatus for performing the method.

[0005]

In order to achieve the above object, the method for forming a hard blade edge of a saw according to the present invention forms a hard blade edge by welding a hard alloy to the tip portion of the saw blade and polishing and shaping. In the method, the rod made of hard alloy is made to be orthogonal to the saw surface, and the tip of the rod is pressure-welded onto the cutting edge to perform resistance welding, and then cut into chips at an angle substantially equal to the edge relief angle of the cutting edge, and then cut. The subsequent rod was half-turned and its tip was crimped onto the next blade edge, and a hard alloy tip was provided on each blade edge in the same process as above. Further, the apparatus for carrying out the above method comprises a saw transfer device, a bar feeding device, a clam width adjusting device, a welding device, and a cutter, and the saw transfer device engages the bottom of the saw with the cutting edge side up. The tip of each cutting edge can be sequentially fed to the welding position by the feeding claw that is used, and the rod feeding device is configured such that the rod made of a hard alloy is orthogonal to the saw surface and the tip is at the welding position. Of the bar material while being supplied to the cutting edge of the bar material so that the bar material can be rotated half a turn, the clam width adjusting device is provided opposite the bar material supplying device with a saw, and the bar guide of the bar material is used. It is designed so that the clam width of the bar can be adjusted by receiving the tip,
In the welding device, the tip of the rod is crimped to the tip of the saw blade by the moving electrode and a current is passed between the tip and the fixed electrode so that the tip of the rod can be resistance-welded to the tip of the saw blade. The cutter is configured so as to be able to cut the tip end portion of the rod material welded with a rotary grindstone inclined at the same angle as the relief angle with respect to the saw surface into chips.

[0006]

The saw transfer device 1 sequentially feeds each tip of the saw blade to the welding portion, and the rod feeding device 2 feeds the hard alloy rod material to the cutting edge so as to be orthogonal to the saw surface. , The clam width of the bar material is adjusted by the clam width adjusting device 3, the tip of the hard alloy bar material is resistance-welded to the cutting edge by the welding device 4, and the tip of the bar material is cleaved by the cutter 5, etc. It is cut into chips at an angle, and the cut bar is rotated half a turn and fed to the next cutting edge, so that the relief angle is formed symmetrically in advance on the left and right end faces of each chip. .

[0007]

EXAMPLE A method for forming a hard cutting edge of a saw according to the present invention is a method in which a hard alloy bar material is made orthogonal to the saw surface, the tip of which is fed onto the cutting edge, and the saw blade and the bar material are crimped. Resistance welding is performed by applying an electric current to the tip. After welding, the welded tip portion is cut into a chip shape at an angle substantially equal to the edge relief angle of the cutting edge, and at the same time, the edge relief angle is formed evenly on the left and right. The bar after cutting is half-turned to press the tip of the bar onto the next blade, and the same steps as above are repeated to provide a hard alloy tip on each blade. After that, the rake angle and the clearance angle of each cutting edge are polished and formed.

Next, an apparatus for carrying out the above method will be described with reference to the drawings. As shown in FIGS. 1 to 5, a saw hard edge forming device according to the present invention includes a band saw transferring device 1, a hard alloy bar feeding device 2, a clam width adjusting device 3, a resistance welding device 4, and a cutter. It is composed of 5 and. As shown in FIG. 2, the transfer device 1 is a feed device in which saw guides 11 are arranged side by side in the longitudinal direction on the upper side of the base 10 at required intervals, and a handle is provided on one side of the base 10. Handle 13
The lower end of the is pivotally supported, and an arm 15 having a feed claw 14 attached to the tip thereof is provided at the intermediate portion thereof toward the welding side.
Thus, the band saw a placed on the saw guide with the edge b side up
When the feed claw 14 is engaged with the bottom of the blade and the feed handle 13 is rotated toward the welding side, the tip of the blade tip b of the band saw a can be moved to the welding position. After moving the front blade to the welding position, the feed handle 13 is rotated to wait for the feed claw 14 to be engaged with the next blade bottom.

The rod feeding device 2 is shown in FIGS. 1, 4 and 5.
As shown in, the support frame 20 is formed into a
Support rims 23, 23 having through holes 24 through which the rods c pass are provided on the respective sides so that the rods c inserted into both through holes 24 are orthogonal to the saw surface. , 25 are pivotally supported 26.
Also, 27 is a rotation angle control piece, one end of which is fixed between both supporting edges 23 of the bar c, when the bar c does not rotate and when it rotates halfway, The side surface of the bar c contacts the side surface 22 of the support portion so that the rotation angle of the bar c can be stopped at a position of 0 or 180 degrees.

As shown in FIGS. 1 and 3, the clam width adjusting device 3 includes a clam guide 30 that moves in a direction orthogonal to the saw surface, and a clam guide adjusting screw that can adjust the moving width of the clam guide 30. 31 and is arranged on the upper side of a saw holder 34 that can be tilted by a support rod 33 pivotally supported by a fixed base 32,
It faces the support frame 20 with the band saw a interposed therebetween. Therefore,
The clam guide 30 receives the tip end portion of the bar c supplied by the bar supply device 2 and adjusts the clam width e of the bar c. The feed claw 14 can slide on the upper surface of the saw holder 34 as the feed handle 13 rotates. Reference numeral 35 indicates a lock screw of the saw presser 34.

As shown in FIGS. 1 and 2, the welding device 4 comprises a moving electrode 40 and a fixed electrode 41.
Has a pressing groove 42 formed on the lower side of its tip, and its rear end is attached to the shaft 26 of the support frame 20 and a lever 43 is attached to the upper rear side. Is mounted so that it can be undulated. In addition, the fixed electrode 41
Is disposed below the movable electrode 40, and is spaced from the saw holder 34 by substantially the same width as the width of the band saw a. Then, when the tip of the bar c is pressed against the cutting edge of the welding position by the pressing groove 42 and a current is passed between the electrodes 40 and 41, the tip of the bar c resists the edge of the band saw a. It is supposed to be welded. Further, the cutter 5 is, as shown in FIGS. 1 and 3,
On a movable table (not shown) that can slide back and forth, a cutter main body 50 having a drive source therein is provided at a required distance from the support portion side 21 of the support frame 20, and the band saw a of the cutter main body 50 is provided.
On the side, a disc-shaped cutting grindstone 51 is rotatably provided.
The cutting surface of this cutting grindstone 51 is always inclined with respect to the saw surface at an angle corresponding to the relief angle θ. Then, when the cutter body 50 is slid to the welding position side and the tip end of the bar material welded to the blade edge of the band saw a is cut by the cutting grindstone 51, as shown in FIG. 6 and FIG. A relief angle θ is formed symmetrically on both end faces.
Further, 52 is a cutting adjusting screw, which moves the cutter body 50 forward and backward with respect to the saw surface to adjust the cutting point of the bar c by the cutting grindstone 51 so that the set width e of the tip d is always equal to the left and right. It is something to do. Further, 53 is an adjusting screw for moving the cutter body 50 back and forth according to the diameter of the cutting grindstone 51.

[0009]

As described above, according to the method and apparatus of the present invention, the following effects can be obtained. Since the tip made of hard alloy is welded to the tip of the saw blade by resistance welding, oxidation of the hard alloy can be avoided in the welding process and it is possible to prevent the hard alloy and the saw from alloying. A cutting edge having cutting performance can be easily formed. Further, since the relief clearance angles of the left and right end surfaces of the chip can be formed in advance without polishing and shaping, the number of polishing steps can be reduced and the loss of expensive alloy can be eliminated.

[Brief description of drawings]

FIG. 1 is a perspective view of a cutting edge forming apparatus according to the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a plan view in which a welding device is omitted.

FIG. 4 is a perspective view of a bar material feeding device.

FIG. 5 is a partial side view of the same.

FIG. 6 is a partial side view of the saw.

FIG. 7 is a partial plan view of the same.

[Explanation of symbols]

 1 Saw Transfer Device 2 Bar Material Supply Device 3 Clam Width Adjuster 4 Welding Device 5 Cutter 13 Feed Handle 14 Feed Claw 20 Support Frame 21 Support 23 Support Edge 25 Arm 27 Control Piece 30 Clam Guide 31 Clam Guide Adjusting Screw 34 Saw Hold 40 Moving electrode 41 Fixed electrode 42 Holding groove 43 Lever 50 Cutter body 51 Cutting wheel 52 Cutting adjustment screw

Claims (2)

[Claims] 1. A method of welding a hard alloy to a tip portion of a saw blade and polishing and shaping the hard blade to form a hard blade tip, wherein a hard alloy rod is made orthogonal to a saw surface, and the tip portion is a blade tip. After crimping and resistance welding on top, cut into a chip shape at approximately the same angle as the edge relief angle of the cutting edge, half-turn the cut bar material and crimp its tip onto the next cutting edge, A method for forming a hard blade of a saw, characterized in that a hard alloy tip is provided on each blade in the same step. 2. A saw transfer device, a bar feeding device, a clam width adjusting device, a welding device, and a cutter, each of which is a feed claw that engages the bottom of the saw with the cutting edge side up. The tip of the cutting edge can be sequentially fed to the welding position, and the rod feeding device feeds the tip of the hard alloy rod to the cutting edge so that the rod is orthogonal to the saw surface. In addition, the bar width adjusting device is opposed to the bar feeding device with a saw interposed therebetween, and the bar guide receives the tip end of the bar by the clam guide. In the welding device, the tip of the rod is crimped to the tip of the saw blade by the moving electrode and an electric current is passed between the tip and the fixed electrode. Of the saw blade can be resistance welded to the tip of the saw blade, and the cutter is A device for forming a hard blade of a saw, characterized in that the tip of a rod member welded by a rotary grindstone inclined at the same angle as the relief angle can be cut into chips.