JPH0717505U - Replacement blade for cutting tools - Google Patents

Abstract

(57) [Summary] [Object] The present invention provides a spare blade for a cutting tool mainly used for wood processing. [Structure] A sintered blank 10 in which a thin cemented carbide back metal layer 11 and a diamond ultra-high hardness sintered layer 12 are integrally sintered, has a larger diameter, is thicker, and is a refined steel base metal 13.
From the brazed to the back metal layer side, cut out the spare blade material at a predetermined angle and finish to the spare blade dimensions.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a spare blade for a cutting tool used for wood processing and processing similar to wood processing.

[0002]

[Prior art]

 Conventionally, long-life cemented carbide has been widely used as a cutting tool for wood processing and processing similar to wood processing, and has become the mainstream of cutting tools. Recently, in order to further improve durability, the use of spare blades whose cutting edges are made of ultra-high hardness sintered bodies such as diamond and borazon is becoming widespread. The commonly used spare blade 1 has, for example, a trapezoidal shape and is fixed to the wall surface 2b of the blade bag 2a of the blade body 2 at a predetermined rake angle as shown in FIG. The spare blade 4 made of ultra-high hardness sintered body used consists of two layers, a sintered layer of diamond, borazon, etc. and a back metal layer made of cemented carbide, and these two layers are simultaneously sintered. It is formed by integration.

That is, as shown in FIG. 2 a, a cutting edge layer 6 is formed on a back metal layer 5 in which a cemented carbide powder is press-molded together with a metal powder of a binder phase into a cylindrical shape thicker than the blade 1 and having a large diameter. Is pressed together with particles of diamond, borazone, etc. and metal powder of the binder phase to a thickness necessary for forming a cutting edge, and is sintered to integrally form a sintered blank 7. This integrally formed sintered blank 7 is obliquely cut as shown in FIG. 2b at the rake angle of the cutting edge + the clearance angle to cut out a spare blade material 8 as shown in FIG. 2c. Further, as shown in FIG. 2d, the shape of the spare blade 4 of the trapezoidal stand is finished and a bolt insertion hole is formed at the center.

[0004]

[Problems to be solved by the device]

 Since the production of the sintering blank 7 requires a long time under high pressure and high temperature of 40,000 atm and 1400 ° C., this sintering operation is costly. For this reason, if the back metal layer 5 is made thicker, the number of inserts into the press die is reduced, the number of simultaneous production cannot be increased, and because the production is a special order, the production price per piece is very high. There is a problem. When the sintered blank 7 is cut diagonally as shown in Fig. 2b to cut out the blade material, a predetermined size cannot be taken at the cutting start and cutting end portions, so an expensive cemented carbide layer and thick There is a problem that the waste metal part of the back metal layer increases and the unit price of the blade increases.

Further, if the cut-out blade material is finished to a predetermined size and the back metal layer of cemented carbide is subjected to post-processing such as hole processing, there is a problem that considerable cost is required. The present invention has been made in view of the above problems of the conventional technology. The purpose of the present invention is to reduce the unit price of the blade made of an ultra-high hardness sintered body and to make it expensive, so that it is marketable. It aims to provide a replacement blade for woodworking tools that has been reduced to a cost that can recover the loss of wood.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention brazes a sintered blank in which a back metal layer is integrated with an ultra-high hardness sintered layer, which is a cutting edge, to a heat-treated steel base metal on the back metal layer side. It is a thing.

[0007]

[Action]

 A standard size sintered blank with a thin back metal layer can be used, and since it is integrally brazed to a steel base with rigidity and toughness, it has sufficient impact resistance in cutting and long cutting life.

[0008]

【Example】

 An embodiment of the present invention will be described with reference to FIGS. On the back metal layer 11 press-molded to a thickness to obtain the required strength by mixing the cemented carbide powder and the metal powder serving as the binder phase, the metal powder serving as the binder phase with diamond particles or borazon particles, and the like. Is mixed and the ultra-hard cemented sintered layer 12 press-molded into a cutting blade to a required thickness is sintered for a predetermined time under the predetermined high pressure and high temperature as described above to manufacture the sintering blank 10. On the back metal layer 11 side of this sintered blank 10, a steel base metal 13 having a diameter larger than that of the sintered blank 10 that has been heat-treated by tempering and tempering and having a width required for a spare blade is brazed. Contact.

[0009] This blade is cut diagonally at an angle of rake + clearance angle to cut out a spare blade material. The cut-out material is processed into a predetermined size and shape of a trapezoidal table as a spare blade as shown in FIG. 4 and a mounting hole 13a is bored. Further, as a replacement blade to be cut out, there is one of other embodiments in which a long groove 13b for mounting and holding is formed as shown in FIG.

[0010]

[Effect of device]

 As described above, the present invention has the following effects. Since the thickness of the sintered blank is thinner, the number of simultaneous manufacturing increases and the sintering cost is lower. A sintered blank can be used, and mounting holes and mounting grooves are machined in the steel base metal. Easy and short time. Since the steel base metal is brazed with a larger diameter than the sintered blank, the cutting position can be taken into consideration to maximize the use of the expensive ultra-high hardness sintered layer, and waste is minimized. It is possible to reduce the cost, and the synergistic effect of these can reduce the blade unit price to a lower level, contributing to the expansion of marketability.

Further, since the steel base metal has sufficient rigidity and higher toughness than the cemented carbide, the safety against fracture is improved. Furthermore, it can be applied to various spare blades, and even for machining that could not be used because it was too expensive in the past, spare blades of ultra-high hardness sintered body can be used, cutting efficiency is improved and cutting edge life is improved. The cost can be reduced. The cost-effective long-life replacement blade can greatly reduce the running cost of the blade.

[Brief description of drawings]

FIG. 1 is a view showing a state in which a conventional blade is attached to a main body.

FIG. 2 is a diagram showing a process of manufacturing a spare blade from a conventional ultra-high hardness sintered blank.

FIG. 3 is a view in which a base metal is brazed to an ultra-high hardness sintered blank of the present invention.

FIG. 4 is a view showing a spare blade of the present invention.

FIG. 5 is a view showing another embodiment of the replacement blade of the present invention.

[Explanation of symbols]

10 Sintered blank 11 Back metal layer 12 Ultra high hardness sintered layer 13 Steel base metal

Claims (1)

[Scope of utility model registration request] 1. A cutting blank comprising a back metal layer integrated with a super-hard sintered layer serving as a cutting blade, which is brazed to a heat-treated steel base metal on the back metal layer side. Replacement blade for tools.