JPH0513513Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

The present invention relates to a disc blade, and particularly to a disc blade suitable for cutting flexible materials such as bundles of straw, styrofoam, sponge, etc., and having a wide cutting area.

[Prior art]

For example, when cutting a bundle of rush grass, a rotary blade with cutting protrusions formed at regular intervals on the outer periphery is used to cut the bundle, and then a circular blade with a continuous knife-like blade is used to clean the cut. I am cutting it again using . Also, when cutting flexible materials such as paper and styrofoam, a similar disc blade is used to avoid snagging. However, because previous disk blades of this type were made of one piece, it was difficult to harden the blade portion uniformly without deforming the disk blade, resulting in poor durability. In addition, when cutting flexible materials with a wide cutting area, such as bundles of rush grass, Styrofoam, and sponge, the disc blade expands due to frictional heat during cutting, causing thermal buckling of the entire disc blade. Due to the deformation and runout, the cutting operation had to be performed at a reduced rotational speed, resulting in poor cutting efficiency. Incidentally, Japanese Utility Model Application Publication No. 52-64990 and Japanese Utility Model Application Publication No. 56-121513 propose a disk blade having a structure in which a separately formed blade body is attached to the outer periphery of a disk-shaped substrate.

[Problems with conventional technology]

However, when using the disc blades described in the above-mentioned publications to cut flexible materials such as bundles of grass, styrofoam, sponge, etc., which have a wide cutting area, the following problems arise. The disc blade described in Japanese Utility Model Application Publication No. 52-64990 has a structure in which a fan-shaped blade body is brazed to a disc-shaped cutter body serving as a base, and no slit is formed in the cutter body. Therefore, like conventional rotary blades, the cutter body deforms due to thermal expansion due to frictional heat during cutting, and the residual stress caused by the difference in thermal expansion coefficient between the cutter body and the blade body can be sufficiently absorbed. The joint material is cracked due to deformation of the cutter body. In addition, the cutter body thermally expands due to frictional heat and deforms due to thermal buckling, causing runout, which requires cutting at a reduced rotational speed, resulting in poor cutting efficiency. According to the specification, the disk blade described in the above publication is suitable for cutting lead wires, and is suitable for cutting flexible materials with a wide cutting area, such as bundles of rush grass, styrofoam, sponge, etc. It can be seen that it is unsuitable for the work to be done. The disk blade described in Japanese Utility Model Application Publication No. 56-121513 has a disk-shaped base metal with a slit, but the blade body is annular and integral. For this reason, when the blade thermally expands due to frictional heat, residual stress caused by the difference in thermal expansion coefficient between the cutter body and the blade cannot be sufficiently absorbed. By the way, the so-called blades are used depending on the type of the object to be cut, the cutting efficiency thereof, and the requirements for the cutting result such as the cut edge, such as a saw and a kitchen knife, or a blade sickle and a saw sickle. When cutting materials that are flexible and have a wide cutting area, such as bundles of rush grass, Styrofoam, sponge, etc., it is better to have unevenness on the blade for better cutting efficiency, but the cutting edge will be similar to cutting with a sharp knife. It won't be pretty. On the other hand, if there are no irregularities on the blade, the cut will be clean, but the cutting efficiency will be poor and the load will be applied, which will not only shorten the life of the blade but also shorten the life of the motor and other prime movers.

[Means to solve the problem]

The measures taken to solve the above problems are as follows. That is, the present invention has a disc-shaped base plate, a plurality of attachment bases formed discontinuously by providing slits inward from the periphery of the base plate, and an outer peripheral portion of the attachment base. A bonded annular copper plate, a plurality of carbide chips continuously bonded to the outer periphery of the copper plate, and a bonding material provided between the carbide chips. a recess formed by polishing a carbide chip; and the outer edge of the carbide chip has a substantially circular shape as a whole, and is a disk blade. The number and length of the slits provided inward from the periphery of the base plate are selected as appropriate depending on various conditions such as the size of the base plate and carbide chips, or the expansion and contraction rate of these materials. Ru. A slit is used to provide a discontinuous attachment base, and the concept includes not only a normal narrow gap but also gaps of various widths and shapes in which a discontinuous attachment base can be provided. By using a copper plate between the attachment base and the carbide tip, cracking of the bonding material and deformation of the disk blade are less likely to occur. This is thought to be due to the fact that the residual stress caused by the difference in thermal expansion coefficient between the attachment base and the carbide chip is efficiently absorbed by the copper plate together with the absorption power of the bonding material. For example, when silver wax is used as the bonding material, silver wax is much softer than the carbide chips, so when polishing the carbide chips, This part is formed by extra polishing.

【Example】

The present invention will be explained in more detail based on embodiments shown in the drawings. Figure 1 is a front view, Figure 2 is an enlarged view of section A, and Figure 3 is a front view.
The figure is a cross-sectional view. A plurality of slits 3 are provided in a disc-shaped base plate 1 from a peripheral edge 2 toward the center. A discontinuous attachment base 4 is provided therebetween by the slit 3. An annular copper plate 8 is bonded to the outer periphery of the attachment base 4 with silver wax 5 interposed therebetween. Furthermore, a plurality of carbide chips 6 are bonded to the outer periphery of the copper plate 8 via silver wax 5 as well. Also, between 6 carbide tips and 5 pieces of silver wax (silver bar, etc.)
The outer edge of the carbide chip 6 is formed so that the entire outer edge is substantially circular. Furthermore, at the tip of the silver wax 5 between the carbide chips 6, there is a slight depression 7 formed when polishing the carbide chips 6.
is formed. By using the copper plate 8, which is a relatively soft metal, between the attachment base 4 and the carbide chip 6, it is possible to prevent the residual It is considered that the stress is efficiently absorbed together with the absorption power of the silver wax 5. Therefore, cracking of the silver wax 5 portion, the carbide chip 6, or deformation of the base plate 1 is less likely to occur. In addition, due to the effect of the depression 7 formed at the tip of the silver wax 5 between the carbide chips 6, a slight catch occurs during rotational cutting, so the cutting speed is higher than that of a knife-like continuous blade. Allows for efficient cutting work. Moreover, the cutting edge is as clean as that of a disc blade with a knife-like continuous blade. Note that the present invention is not limited to the illustrated embodiment, and many modifications can be made within the scope of the claims of the utility model registration.

[Effect of the idea]

The present invention has the above configuration and produces the following effects. (a) A circular copper plate is interposed between the base plate and the carbide chip. For this reason, even if the disc blade is rotated at high speed to cut the object, the strain caused by the difference in thermal expansion coefficient between the base plate and the carbide chip heated by frictional heat will be applied to the slit and the joining material as well as the copper plate. It is also efficiently absorbed by Therefore, cracking of the joining material and deformation of the disk blade are unlikely to occur. (b) Since a recess is formed at the tip of the joining material between the carbide tips, a slight catch occurs during rotary cutting, for example when cutting a bundle of strawberries, compared to a knife-like continuous blade. This allows for highly efficient cutting work. Moreover, the cutting edge is as clean as that of a disc blade with a knife-like continuous blade.

[Brief explanation of drawings]

Figure 1 is a front view, Figure 2 is an enlarged view of section A, and Figure 3 is a front view.
The figure is a cross-sectional view. 1... Base plate, 2... Periphery, 3... Slit, 4
... Mounting base, 6... Carbide tip, 7... Recess,
8...Copper plate.

Claims (1)

[Claims for Utility Model Registration] A disc-shaped base 1; a plurality of mounting bases 4 formed discontinuously by providing slits 3 inward from the periphery 2 of the base 1; An annular copper plate 8 bonded to the outer periphery of the attachment base 4; a plurality of carbide chips 6 bonded continuously to the outer periphery of the copper plate 8; and a bonding material between the carbide chips 6. a recess 7 provided at the tip of the carbide chip 6 and formed by polishing the carbide chip 6 after adhesion; and an outer edge of the carbide chip 6 having a substantially circular shape as a whole.