JPH08112719A - Structure of changeable shearing edge - Google Patents

Abstract

PURPOSE: To provide the new structure of a shearing edge which can be utilized several faces by altering the angle of an edge part. CONSTITUTION: A shearing edge is composed by changeably attaching to a pedestal a cutting tool which is square in a section, and composes each independent edge part in four ridgeline parts, and a positioning groove 1 is severally provided on the four sides 2 of the square cutting tool, and a projection formed on the pedestal is inserted to the position of the bottom 3 of the groove 1 for fixing a positional relation between the pedestal and the cutting tool.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a replaceable shear blade structure.

[0002]

2. Description of the Related Art As represented by a throw-away tool, it is usually practiced to form one blade in a polygonal shape, and to make effective use of one blade by giving each of the protrusions a cutting function. I am here. This is because the part that wears is limited to the tip and the ridge line part of the polygonal tool does not wear, so it is possible to fix the position on the pedestal that fixes the tool with this ridge line part as a reference surface without constant position. is there. On the other hand, this method cannot be used for those in which the ridge line portion serving as the reference surface is worn. A shear blade is a good example. Even if the blade part of the shear blade is made replaceable and it is formed in a polygonal shape so that it can be used in a multifaceted manner by forming a blade part at each ridge line part, in this case, the ridge line part that becomes the reference surface It is extremely difficult to adjust the positional relationship between the pedestal and the blade due to wear and dimensional changes. This is why it is difficult to use the shear blade in many ways like a throw-away tool. If the shearing blade can be used in many ways by changing the angle, this is extremely useful in industrial terms.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a new structure of a shearing blade which can be used on any surface by changing the angle. Is.

[0004]

[Means for Solving the Problems] As a result of earnest research on the above problems, the following findings were obtained. That is, the blade is constructed so that it can be attached to the pedestal in a replaceable manner, the sectional shape of the blade is a square shape, and the four ridge portions form independent blade portions. If a groove for positioning is provided on the side surface of the base and the protrusion formed on the pedestal is inserted to the position of the bottom of this groove to fix the positional relationship between the base and the blade, the bottom of the groove will be Since it can always be used as a reference surface for positioning without wear, I realized that one blade can be used in many ways.
The present invention is based on this finding.

[0005]

[Function] In the shear blade, the distance between the upper blade and the lower blade must be kept within a certain range. Therefore, when setting the blade on the pedestal, it is necessary to always set the blade so as to protrude from the entire surface of the pedestal by a predetermined amount. Also, once set, it must be fixed without movement during use. Moreover, it is not preferable that it takes time to set. In other words, it can be set with one touch, and it must be fixed constantly during use. According to the present invention, the protrusion formed on the pedestal is inserted up to the position of the bottom surface of the groove formed on the side surface of the blade, that is, the tip of the protrusion hits the bottom surface of the groove, and the blade is fixed to the pedestal at a place where it cannot move any more. Since the blade is always backed up by the protrusion of the pedestal, it will not be displaced during use. Moreover, it is only necessary to insert the protrusion of the pedestal into the groove of the blade and fix it at the place where the bottom of the groove and the tip of the protrusion simply contact each other, so that the blade can be set on the pedestal with one touch. The cross-sectional shape of the blade is a square shape, and the four ridge lines in the length direction are independent blade portions. Considering one ridgeline that forms the blade, it is only the front side surface that wears out, not the upper surface. Therefore, if the worn side surface portion is brought to the upper surface and the upper surface that is not worn is brought to the side surface, the same ridge portion, that is, the same blade portion can be used twice. Therefore, it can be used eight times in total by changing the angle and setting. The blade may be fixed to the pedestal by inserting a fastener such as a bolt into a hole that penetrates the upper and lower surfaces of the blade and tightening the pedestal. Alternatively, it may be fixed to the pedestal by a clamp mechanism other than this. In any case, any mechanism can be used as long as the positional relationship between the protrusion and the groove does not shift. The depth of the groove may be shallower than the maximum wear amount as long as it is a portion that is not affected by wear, but if it is deeper than the maximum wear amount, it can be formed in any portion other than the ridge line portion forming the blade. There is no particular restriction on the structure of the blade used, whether it is an integral type or a compound type in which only the blade portion is made of a hard material.

[0006]

Embodiments of the present invention will be described with reference to the drawings. 1 to 3 are views for explaining the structure of the most typical embodiment of the present invention. 1 to 3, FIG. 1 is a side view of a blade, FIG. 2 is a cross-sectional view, and FIG. 3 is a diagram illustrating a state of being set on a pedestal. The blade is a long body as shown in FIG. 1 and has a sectional shape as shown in FIG. That is, in a quadrangular prism, independent blade portions are formed on four ridge lines in the length direction, and the blade portion is quench hardened (hatched portion). A groove 1 as shown in FIG. 2 is formed on each surface in the length direction, and the depth of the groove is machined to a depth equal to or larger than the maximum wear depth. Therefore, the position of the bottom surface 3 of the groove remains unchanged regardless of wear of the side surface 2. When the side surface 2 is worn, make the side surface 2 the upper surface,
If the upper surface 4 is reset to the side surface, the blade portion of this ridge line can be repeatedly used twice. 2 with 4 blades each
It can be used a total of 8 times. When set on the pedestal, the protrusion 6 of the pedestal 5 is inserted into the groove 1 and the tip portion of the protrusion is in contact with the bottom surface 3 of the groove. Therefore, the blade will not move to the left of this position. In this state, a bolt is inserted into the through hole 7 of the blade and fastened to the pedestal 5. The gap between the upper blade 8 and the lower blade 9 is always maintained within a certain range, and the shearing process is started in this state. When the blade wears and the gap opens and the control limit is exceeded, rotate the blade and set it again. At this time, the tip of the projection is again set in contact with the bottom of the new groove. Even if the blade portion is worn, the bottom surface of the groove is not worn and is always unchanged, so that the blade portion protruding from the pedestal is always kept at a constant value.

[0007]

【The invention's effect】

1. The replaceable blade can be attached to the pedestal with one touch, and the blade does not move. 2. One blade can also be used for eight surfaces. 3. The structure of the blade is simple and the manufacturing cost is low.

[Brief description of drawings]

FIG. 1 is a side view of a cutting tool according to an embodiment.

FIG. 2 is a sectional view of a cutting tool according to an embodiment.

FIG. 3 is an explanatory view of a state in which a blade is fixed to a pedestal.

[Explanation of symbols]

 1 ... Groove 2 ... Side surface 3 ... Bottom surface 4 ... Top surface 5 ... Pedestal 6 ... Projection 7 ... Through hole 8 ... Upper blade 9 ... Lower blade

Claims (1)

[Claims] 1. A shearing blade having a quadrangular cross section, in which four ridges each independently constitute a blade, and the blade is replaceably attached to a pedestal. A replaceable shear characterized in that positioning grooves are provided on the four side surfaces of the base, and the projection formed on the base is inserted to the position of the bottom surface of the groove to fix the positional relationship between the base and the blade. Blade structure.