JPH0262336B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method of manufacturing a long composite cutter such as a veneered rotary knife, which does not require a particularly large press machine, and which does not require a step on the base metal member. The present invention relates to a method for manufacturing a long composite cutter that is crimped and rolled without requiring machining.

[Conventional technology]

As shown in FIG. 5, the long composite cutter is composed of a base metal 1 made of structural carbon steel or the like and a blade metal 2 made of tool steel or the like. In Figure 5,
The shape shown by the dashed line shows the shape of the blade material before any necessary machining such as cutting or grinding is performed.

As shown in FIG. 6, the conventional method for producing the material for this long composite cutter is to heat a base metal member 1a and a blade member 2a with a rectangular cross section to a temperature necessary for forge welding.
Layer them together and use a high-pressure press to form the blade member 2a.
was pressed into the base metal member 1a, and then reheated and rolled to produce a material for a long composite cutlery.

Another conventional method for manufacturing a material for a long composite cutter, as shown in FIG. It was heated to the temperature required for forge welding and then rolled.

Furthermore, the proposal described in Japanese Patent Publication No. 62-36812 is that, as shown in FIGS. 8 and 9, the blade 2 is crimped onto the base metal 1 to form the blade edge member 3, and after heat treatment, the attachment member is This is a manufacturing method in which the parts 1b are joined together by laser beam welding or the like.

[Problem to be solved by the invention]

However, in the above-mentioned conventional manufacturing method for long composite cutlery, the manufacturing method using press crimping described as the first method requires, for example, a 5000-ton class high-pressure press machine, which requires extremely expensive equipment. . Furthermore, during roll rolling, it was necessary to heat the material again to 1100 to 1200°C, resulting in high energy costs. Further, in crimping the base metal member and the blade member, the blade member is pressed into the base metal member and pressure is applied until both become flat, which has the disadvantage that the width and thickness of the blade member become uneven.

Next, the manufacturing method described as the second method is
Since it is necessary to provide a notch step in the base metal member, a cutting process is required for forming the step, which increases the number of man-hours. Furthermore, since the stepped portion is cut out from the flat plate, there is a drawback that the yield of material is extremely low.

Furthermore, although the manufacturing method described in the above-mentioned publication has the effect of reducing deformation and internal stress generated by the compression heat treatment of the cutting edge member only in one direction (up and down), it requires a large laser beam device, which increases the manufacturing cost. The disadvantage was that it was expensive.

The present invention was made to improve the conventional manufacturing method in view of the above circumstances, and provides a long composite cutter made by simultaneously pressing and rolling a blade member and a base metal member onto a base metal member using a simple method. The purpose is to provide a manufacturing method.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a manufacturing method for manufacturing a long composite cutter made of composite material from three parts: a blade member, a base metal member, and a base metal member. The first step is to weld and shield the raw metal members to form a material block, and the second step is to heat the material block to a predetermined temperature in a heating furnace and then press and roll it with a rolling roll to form a cutter material.
and a third step of forming the cutter material processed in the second step into a cutter.

[Effect]

Next, the operation of the present invention will be explained.

The present invention is a manufacturing method for manufacturing a long composite cutter made of composite material from three parts: a blade member, a base metal member, and a base metal member, and in the first step, the blade member and the mounting member are placed on the base metal member. The material blocks are then placed against each other and shielded by welding at their contacting parts to form a material block. Further, at this time, if the abutting angle between the blade member and the base metal member is approximately 80 degrees, the adhesion between the two after pressure contact will be even better.

In the next second step, this material block is heated to about 1,100 to 1,200°C in a heating furnace, then pressure-rolled with rolling rolls, and the three parts are forged at the same time.

Finally, in the third step, the blade material thus pressure-rolled is formed into a blade by cutting or the like.

Therefore, according to the present invention, there is no need for an expensive high-pressure press machine or laser beam welding device, and the forge welding and rolling operations can be performed at the same time by one heating operation, resulting in improved thermal efficiency.

〔Example〕

Next, a first embodiment of the manufacturing method of the present invention will be described.
This will be explained with reference to FIGS. 3 to 3.

In FIG. 1, the base metal member 5 is made of structural carbon steel, and a blade member 6 such as tool steel is placed on this base metal member 5.
and a bare metal member 7 made of structural carbon steel are placed in abutted state, and the contacting portions of these three members are each welded to form a shield 8 to form a material block A.

Next, this material block A is heated to about 1100 ml in a heating furnace.
It is heated to ~1200° C. and rolled to a constant thickness with rolling rolls 9, 9 as shown in FIG. 2, and the blade member 6 and base metal member 7 are simultaneously pressed and rolled onto the base metal member 5.

Finally, the cutter material formed by pressure rolling as described above is formed into a product 10 by cutting or the like.

Next, another embodiment shown in FIG. 4 will be described.

The material block B of this embodiment is the same as the first embodiment in that the blade member 6a and base metal member 7a are placed on the base metal member 5 so as to butt each other, but the blade member 6
The thickness of the base metal member 7a is formed slightly thinner than a,
The angle θ of the abutting surfaces is approximately 75 to 85 degrees.

When the material block B having such a shape is heated in a heating furnace and pressure-rolled by the rolling rolls 9, 9, the blade member 6a and the base metal member 7a are further bonded due to the inclination of the abutting surface 11. Strongly bonded.

〔Effect of the invention〕

According to the manufacturing method of the present invention described above, heating is performed for 1
Energy costs are low because it only takes a few times,
Since the blade member, base metal member, and base metal member are simultaneously pressure-rolled using rolling rolls, there are fewer work steps, and a blade with uniform width and thickness of the blade portion can be obtained. In addition, since a large press machine or laser beam welding device is not required, it is advantageous in terms of cost and equipment space.

Furthermore, compared to the conventional manufacturing method in which steps are provided on the base metal member, the number of man-hours required for step processing is not required, and the material yield is also improved.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a material block according to the manufacturing method of the present invention, Fig. 2 is an explanatory view showing the crimping and rolling state, Fig. 3 is a side view of the product, and Fig. 4 is a material block according to another embodiment. FIGS. 5 to 9 are cross-sectional views of conventional examples. 5... Base metal member, 6... Blade member, 7... Base metal member, 8... Welding shield, 9... Rolling roll, 1
0...Knife (product), 11...Abutment surface, A,
B...Material block.

Claims (1)

[Claims] 1. In a manufacturing method for manufacturing a long composite cutter made of composite material from three parts: a blade member, a base metal member, and a base metal member, the blade member and base metal member are placed on the base metal member. The first step is to weld and shield to form a material block.
a second step in which the material block is heated to a predetermined temperature in a heating furnace and then pressure-rolled with a rolling roll to form a cutter material; and a second step in which the cutter material processed in the second step is formed into a cutter. A method for manufacturing a long composite cutlery, comprising a third step. 2. The method for manufacturing a long composite cutter according to claim 1, characterized in that the abutting surface angle between the blade member and the metal member is approximately 80 degrees.