JP2017131970A - Method for forming saw blade of serrated sickle and the like - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for forming efficiently fine saw blades of a serrated sickle and the like.SOLUTION: Recessed grooves 3 are pressed and then formed at constant intervals at a side edge 2 of one side 1a of a blade plate 1, from inward toward the side edge, and a side edge of the other side 1b is cut off by a polishing wire 10 with a constant inclination angle, so as to form a serrated sickle 4. In order to form the recessed grooves 3, a plurality of recessed grooves 3 and 3 are pressed and then formed at the same time using a chisel aggregated block 6 having a plurality of chisels 5 and 5 overlapped with each other and then fastened. For the chisel aggregated block 6, it is preferable that the chisels 5 and 5 at an intermediate position with a constant thin thickness are positioned in a holder across chisels 7 and 7 positioned at both ends with thicknesses larger than the chisels at the intermediate position and the chisels are fastened to the holder with fastening bolts.SELECTED DRAWING: Figure 1

Description

  As the sickle, for example, a saw sickle with a blade-like edge is known, such as a sickle for harvesting rice. The present invention relates to a method for forming a saw blade on a blade edge like a conventionally known saw sickle.

As understood from Patent Document 1 and Patent Document 2, as a method for manufacturing the saw blade, a concave groove is formed in the inner peripheral edge portion of the curved blade plate surface toward the inner peripheral edge, and the inner peripheral edge portion is formed from the back surface. A method of forming saw blades by polishing the surface of the metal to an inclined surface is known.
In the above-mentioned saw blade manufacturing method, conventionally, one concave groove is formed by one pressing process using a chisel, and the concave surface is formed one by one over the entire length of the blade on the surface of the blade plate. The polishing process was performed.

JP 2007-252328 A Japanese Utility Model Publication No. 37-24315

In the conventional method for manufacturing a saw blade, when forming the groove on the entire length of the edge of the blade plate, the groove is formed one by one with one chisel. For this reason, there is a drawback that it takes time to manufacture.
In addition, it has been difficult to manufacture a fine saw blade with the conventional method. One of the reasons is that it is necessary to use an extremely thin chisel corresponding to fine eyes, and there is a problem that the strength of the flexure deformation and chisel itself is insufficient. Furthermore, it is necessary to perform a feed process with a small dimension when processing the concave groove, which makes it difficult to perform highly accurate processing.

  In view of the above-described drawbacks of the prior art, an object of the present invention is to provide a method capable of efficiently producing fine-toothed saw blades. Another object of the present invention is to provide a method capable of accurately and precisely manufacturing a fine-toothed saw blade.

  The invention according to claim 1, which achieves the above object, is formed by pressing grooves 3 and 3 on the side edge 2 of one side surface 1a of the blade plate 1 from the inside toward the side edge 2 at regular intervals. In the method of forming the sawtooth 4 by cutting the side edge of the side surface 1b at a constant inclination angle, a plurality of concave grooves 3, 3 are formed using a plurality of chisel collecting blocks 6 fixed by overlapping a plurality of chisel 5, 5 Is formed by pressing at a time.

  The invention according to claim 2 forms the chisel collecting block 6 by sandwiching the chisel 5, 5 at the intermediate position with a certain thin thickness between the chisel 5, 5 at the thicker end than the chisel 5, 5 at the intermediate position, This is to fix the chisel collecting block 6 to the holder 9 with fixing bolts.

  The invention according to claim 3 is a blade plate in which a plurality of chiseles 5 and 5 are overlapped, and a dimension corresponding to a plurality of pitches of the concave grooves 3 to be processed is used as a feed pitch in one pressing process. 1 is moved, and a plurality of concave grooves 3 and 3 are formed by a single pressing operation.

According to the present invention, the groove 3 is pressed and formed on the side edge of one side surface of the blade plate 1 from the inside toward the side edge at a constant interval, and the side edge of the other side surface is cut off at a constant inclination angle. Thus, in the method of forming the sawtooth 4, the concave groove 3 can be efficiently formed.
That is, according to the invention described in claim 1, since the pressing process is performed using the chisel collecting block 6 in which the plural chisel 5, 5 is overlapped and fixed, the plural concave grooves 3, 3 can be formed at a time, and a large number of grooves can be efficiently formed over the entire side edge of the blade plate.

  Further, in the conventional method, the pitch of the saw blade is determined by the feed size of the chisel 5 or the blade plate 1, and the thickness of the chisel 5 is limited by the one pitch width of the saw blade. Therefore, when trying to form a sawtooth of a small eye, it is necessary to perform pressing with a small pitch feed using a single piece of ultra-thin, considering the strength during pressing and the accuracy of the feed dimension, It was practically difficult to form small saw blades.

  On the other hand, according to the present invention, for example, the thickness of the ultra-thin chisel 5 and 5 is superposed by superimposing the ultra-thin chisel 5 and 5 so that the thickness of the chisel collecting block 6 is 1 pitch P. 1 pitch p, p, that is, a fine saw blade having an accurate pitch, which is a glance, can be formed. Further, by superposing the very thin chisel to form the chisel collecting block 6, the ultra-thin chisel is reinforced and strong in strength compared to the case where pressing is performed with one ultra-thin chisel. Processing can be performed in a state.

  According to the second aspect of the present invention, the fixed thin thickness, i.e., the extremely thin middle position steel 5, 5 is sandwiched between the both end position steel 7, 7 which is thicker than the middle position steel, and is positioned in the holder 9. And fixed to the holder 9 by the fixing bolt 8. Therefore, the force acting outwardly on the both ends of the chisel collecting block 6 by the pressing operation is supported by the chisels 7 and 7 which are superior in strength to the chisel 5 at the intermediate position, so Therefore, it is possible to prevent a very thin chisel that is pushed sideways from being deformed, and to form a groove having a small pitch accurately and stably. As a result, it is possible to manufacture saw blades with smaller pitches with accurate pitches p and p.

  According to the invention described in claim 3, the feed of the blade plate 1 as a work is a thickness dimension obtained by superimposing a plurality of chisel 5, 5, and an integral multiple of the thickness of the ultra-thin chisel is used as the feed pitch. Since it is moved, it is possible to efficiently process a plurality of concave grooves at a time, and to reduce a feed dimension error per pitch. The feed pitch is not necessarily required to match the thickness of all the sheets superimposed on the chisel collecting block. For example, one-half of the thickness of the ultra-thin chisel superimposed on the chisel collecting block can be used as the feed pitch. In this case, each concave groove is processed by double punching with an ultrathin chisel at a different position.

FIG. 1 is a front view showing a state in the middle of manufacturing a saw blade by a method for manufacturing a saw blade such as a saw blade of the present invention, FIG. 2 is a front view showing an example of a completed saw sickle, FIG. 3 is a partially enlarged view showing a processing state of a groove by a holder equipped with a chisel collecting block, FIG. 4 is a side view of the holder on which the chisel collecting block is mounted.

Embodiments of a method for manufacturing a saw blade such as a saw sickle according to the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a front view showing a state in the middle of manufacturing the saw sickle shown in FIG.
The saw blade shown in FIG. 2 forms a large number of saw teeth on the inner edge of the substantially arc-shaped blade plate 1 and is used for harvesting vegetables, cutting cardboard, or cutting a rope during packaging work. To do. In particular, an example is shown in which fine saw blades are formed, for example, fine saw blades of about 250 to 260 meshes per 15 to 16 cm.

  The saw blade is used for harvesting vegetables, harvesting rice, cutting the rope at the time of cargo handling work, etc., but depending on the application, for example, it is an object to be cut between the saw blades 4 and 4 as in the case of cutting the rope. A thin string or fiber constituting the rope may be fitted into the rope, which may make cutting difficult. In such a case, it is preferable to cut with finer saw blades. However, in the conventional method of forming a sawtooth by forming a groove with a chisel for each eye, for example, it is limited to forming about 120 teeth per 15 to 16 cm. It was difficult to accurately form the eyes. In view of the drawbacks of the conventional method, an attempt is made to accurately form finer saw blades.

  In the present invention, the groove is formed on the blade plate 1 using an extremely thin chisel 5. As shown in FIGS. 1 and 3, the ultra-thin chisel 5 is superposed on a plurality of ultra-thin chiseles 5 and 5 and fixed to the holder 9 using fixing bolts 8. In the embodiment shown in FIG. 3, both ends of four ultra-thin chiseles are set between holders 9 having thick thickness at both end positions 7 and 7 and fixed by fixing bolts 8. The tip of the extremely thin chisel 5 is mountain-shaped, and a concave groove is formed by a V-shaped cross-section chisel with the central position at the apex.

  As shown in FIG. 3, the chisel 5 is driven up and down at the same position by a press machine, and the entire length of the side edge 2 is moved by moving the blade plate 1 as a work in the left direction in the drawing as indicated by an arrow. The concave grooves 3 and 3 can be pressed. When the inner peripheral edge of the blade plate 1 is arcuate, it is possible to realize a feed with a fixed dimension by setting the blade plate on a turntable and rotating the turntable by a fixed angle.

  In the case of the illustrated embodiment, pressing is performed using a chisel collecting block 6 formed by an ultrathin chisel 5 and both end position chisel 7. By this pressing, a plurality of concave grooves 3 having a mountain-to-vertex dimension of 1 pitch p, p are formed at a time. In the case of the illustrated example, six concave grooves 3, 3 are formed by a single pressing process. In this case, the tip of the both-end position chisel 7 is formed at the same tilt angle as the tip angle of the ultrathin chisel 5.

  As a modified example, the tip of the both-end position chisel 7 is not a chevron-shaped chisel shape but abuts against the side surfaces of the ultra-thin chisel 5 at both ends, and does not have a chevron-shaped chisel shape, that is, the tip is cut off. It can also be implemented as a flat reinforcing plate. In the embodiment shown in FIG. 3, when the both-end position chisel is used as the reinforcing plate, the four-pit groove 3 is pressed and formed by a single pressing process. In this way, the sandwiched chisel 5 is reinforced by arranging the thick both-end position chisel or reinforcing plate. For this reason, it is possible to use an extremely thin chisel that could not be used conventionally, and it is possible to form a saw tooth having a thickness of the chisel 5 to be superposed, for example, less than 1 mm, in other words, a pitch of less than 1 mm. Further, the number of the overlapped steel 5 and 5 is not limited to the illustrated embodiment, and a larger number of the steel can be set as a set.

The concave groove 3 formed on the side edge of the one side surface 1a of the blade plate 1 is an inclined groove that is deeply pressed from the inside toward the side edge, as understood from FIGS. The concave groove 3 is preferably inclined. Inclining the concave groove 3 can be performed by inclining the chisel and fixing it to the holder 9 as shown by a two-dot chain line in FIG.
Instead of inclining the chisel, it can be carried out by setting the blade plate 1 as a work in an inclined state.

  After forming the recessed groove 3 in the inclined state, the side edge portion is cut out in an inclined state from the other side surface 1b. That is, when grinding is performed with the polishing line 10 shown in FIG. 4 and chamfering is performed, accurate triangular saw teeth 4 and 4 are formed as shown in FIG. The tip of the saw blade is a saw blade formed with, for example, a sharp blade located at the center of the thickness of the blade plate 1, and does not mean a saw blade with a set like a general saw.

DESCRIPTION OF SYMBOLS 1 ... Blade plate, 1a ... One side surface, 1b ... The other side surface, 2 ... Side edge, 3 ... Concave groove, 4 ... Saw tooth, 5 ... Sag, 6 ... Slag gathering block, 7 ... Both ends position chisel, 8 ... Fixed Bolt, 9 ... holder, 10 ... polishing wire.

Claims (3)

  A method of forming a sawtooth by pressing and forming a concave groove on a side edge of one side surface of a blade plate from the inside toward the side edge at a constant interval and cutting off the side edge of the other side surface at a constant inclination angle. A method for manufacturing a saw blade such as a saw sickle, wherein a plurality of concave grooves are pressed and formed at once using a chisel collecting block in which a plurality of chiseles are overlapped and fixed.   The chisel collecting block is characterized in that a middle thin of a certain thin thickness is sandwiched between both thick middle chisel of the middle position and is fixed in the holder by a fixing bolt. The manufacturing method of saw blades, such as the saw sickle of Claim.   The blade plate has a thickness dimension obtained by superimposing a plurality of chiseles, and a dimension corresponding to a plurality of pitches of the concave grooves to be processed is moved as a feed pitch in one pressing process, and a plurality of pressing plates are operated by one pressing operation. A method for producing a saw blade such as a saw blade according to claim 1 or 2, wherein a concave groove is formed.

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