JP2018176353A - Manufacturing method for processing tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method for a processing tool that allows hole processing to be easily performed even after heat treatment, and can achieve pitch dimensions of a mounting hole with high precision, without being affected by dimensional change caused by the heat treatment.SOLUTION: A manufacturing method for a processing tool, which has a mounting hole to be mounted on a processing machine and has a tool main body made wholly of steel, comprises: a step of forming a through-hole in at least one position of the tool main body; a step of temporarily joining a mounting tool made of soft steel with hardness lower than hardness of the tool main body to the through-hole; a step of performing heat treatment after the temporarily joining step, and finally joining the tool main body to the mounting tool by the heat treatment as well as heat by the heat treatment; and a step of forming the mounting hole in the mounting tool after the finally joining step.SELECTED DRAWING: Figure 3

Description

The present invention relates to a method of manufacturing a steel processing tool having a mounting hole for heat treatment to improve wear resistance and toughness and having a mounting hole for mounting on a processing machine, and more particularly to steel shears for steel using SKD material and SKH material. The present invention relates to a method of manufacturing a processing tool in which the tool main body is made of all steel requiring excellent rigidity and wear resistance and machinability of blades, mechanical sliding parts, die sets, press dies, punches and cutters for wood and pulp. .

Machining tools made of a full steel tool body are used in applications requiring more rigidity because they are more rigid than forged products and brazed products. In addition, the fact that the number of processing steps is short and the manufacturing lead time is short, and the small distortion and good hand-off are also advantageous. However, as the tool body becomes an elongated tool having mounting holes for attaching to a processing machine among processing tools made of all steel, the dimensional change (hereinafter referred to as heat treatment dimensional change) accompanying heat treatment becomes larger, Along with that, the error in the dimension between the mounting holes increases, and it can not be avoided as a problem.

As an example of the countermeasure, patent document 1: Unexamined-Japanese-Patent No. 11-092871 has a description regarding the heat processing dimension change of cold-tool steel (SKD material). According to it, by limiting the composition of the cold tool steel, it is possible to minimize the heat treatment dimensional change.
In the embodiment, the maximum amount of change (%) obtained by dividing the heat treatment reduced amount by the original size is 0.110% as a maximum change amount satisfying claim 1 in Table 1 of Patent Document 1. There is a description of -0.120% (Test 11 and Tests 15-18).

Moreover, as an example of another countermeasure, patent document 2: Unexamined-Japanese-Patent No. S50-150097 has a description regarding the heat processing of all the steel cutters. According to it, heat treatment is carried out after heat treatment because heat treatment is difficult, but heat treatment is carried out, but heat treatment distortion occurs and the pitch dimension of the mounting holes machined to a fixed size is distorted, so the dimension error is absorbed The holder has the following structure.

JP-A-11-092871 JP S50-150097

However, Patent Document 1 states that the heat treatment dimension can be minimized, but it is stated in the specification that “this dimensioning is caused by thermal stress and transformation stress, and the dimension amount is the cooling rate, elastic limit, Depending on the thermal conductivity, the amount of retained austenite, the carbides, and the shape, it is noted that the dimensions vary and can not be completely eliminated. For example, assuming that the pitch dimension of the two mounting holes is 4100 mm, 4100 × 0.110 ÷ 100 = 4.51 mm in the case of the above-mentioned minimum variation amount of 0.110%, and the dimensions vary within this range. And can not be used when more precise dimensions are required.

Moreover, since patent document 2 is not a countermeasure with respect to the cutter itself, there exists a restriction | limiting that it must be a pair with a corresponding holding tool.

In addition to the above, it is also possible to carry out drilling processing by electric discharge machining or the like after heat treatment, but it is very expensive, and it is even more so when there are many holes.

SUMMARY OF THE INVENTION In view of the above situation, the object of the present invention is to perform hole processing easily even after heat treatment, and to obtain a pitch dimension of mounting holes with high accuracy without being affected by heat treatment dimensional change, A tool body is providing a manufacturing method of a processing tool made of all steel.

The present invention is as follows in order to solve the above-mentioned problems.
First, a method of manufacturing a processing tool having a mounting hole for mounting on a processing machine and the tool body is made of all steel, the step of forming a through hole in at least one place of the tool body, and the through hole Temporarily joining together a fixture made of mild steel whose hardness is lower than that of the tool body, performing heat treatment after temporary joining, and simultaneously joining the tool body and the fixture by heat treatment temperature simultaneously with the heat treatment; And a step of forming a mounting hole in the fixture after bonding.

Accordingly, the mounting holes can be easily processed even after the heat treatment, and the pitch dimension of the mounting holes can be obtained with high accuracy without being affected by the heat treatment dimensional change.

A method of manufacturing a processing tool having a mounting hole for mounting on a processing machine, wherein the tool body is made of all steel, and forming a through hole in at least one or more places of the tool body; Heat treating the tool body after forming, temporarily joining a mild steel fixture having a hardness lower than the tool body to fix the tool body in the through hole after heat treatment, and temporarily joining the tool It is set as the manufacturing method of the processing tool provided with the process of carrying out the main joining of a tool main body and the above-mentioned fitting, and the process of forming a mounting hole in the above-mentioned fitting after main joining.

Accordingly, the mounting holes can be easily processed even after the heat treatment, and the pitch dimension of the mounting holes can be obtained with high accuracy without being affected by the heat treatment dimensional change.

In addition, the mounting holes are screw holes.

Since the heat treatment is not influenced by the dimensional change, the accuracy can be obtained even if the screw hole is required to have a high accuracy pitch of the mounting hole.

In addition, temporary bonding is welding.

The temporary joining is welding, so that the tool body and the fixture before the final joining can be securely fixed.

Further, the main bonding is performed by brazing.

Since the bonding strength between the tool body and the fixture can be sufficiently obtained by brazing, even if the processing tool is heavy, the processing tool can be lifted through a mounting bolt (eye bolt) or the like in the mounting hole. it can.

According to the present invention, in the case of a processing tool having a mounting hole for attaching to a processing machine and the tool main body is made of all steel, it is possible to easily perform hole processing even after heat treatment, and it is affected by heat treatment dimensioning It is possible to obtain the pitch dimension of the mounting hole with high accuracy.

The figure for demonstrating the attachment hole dimension of the processing tool which concerns on this invention. The figure for demonstrating joining of the tool main body of a processing tool which concerns on this invention, and a fixture. AA sectional drawing of FIG. 2 for demonstrating joining of the tool main body of a processing tool which concerns on this invention, and a fixture. The figure for demonstrating the manufacturing process of 1st Example of the processing tool which concerns on this invention. The figure for demonstrating the manufacturing process of the 2nd Example of the processing tool which concerns on this invention. The photograph for demonstrating the joining of the tool main body and fixture of the processing tool which concerns on this invention.

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 4.
First, as shown in FIG. 1, the machining tool 1 has a finishing dimension of 80 mm wide × 30 mm high × 4140 mm long, and has 42 M10 tap holes 3 as mounting holes. 31 and the longest pitch dimension of the mounting hole 32 on the right end side is L = 4100 mm, and the designated tolerance is within ± 2 mm.

The tool body 2 is made of all steel made of SKD11, and its material dimensions are such that the width and height are about 1 mm each added to the finish processing dimensions and the length is the maximum shrinkage after heat treatment as an empirical value As a dimension to which about 4 mm was added.

The fixture 4 was a mild steel of SS400 as a material whose hardness does not increase even when heat treatment is performed, with φ 20 (tolerance: 0, -0.1) mm.

As a manufacturing method according to the first embodiment of the present invention, first, as shown in FIG. 4, in step S11, φ20 (tolerance: +0.1, +0.05) mm for joining the fixture 4 to the tool body 2 42 through holes 5 were formed at an equal pitch of 100 mm.

Next, in step S12, the fixture 4 was inserted into the through hole 5 of the tool main body 2, and the tool main body 2 and the fixture 4 were temporarily joined. As the method, as shown in FIGS. 2 and 3, spot welding 6 was performed on the upper surface 2a and the lower surface 2b.

Next, as step S13, heat treatment of the processing tool 1 and main joining of the tool body 2 and the fixture 4 were simultaneously performed. As the method, as shown in FIGS. 2 and 3, first, the brazing material 7 was placed near the center of the upper surface of the fixture 4 and heat treatment was performed in that state. In this case, since the heat treatment and the brazing are simultaneously performed, the brazing material 7 was prepared by blending Cu with an alloy (Mn and Ni) to adjust the melting point so that the brazing material 7 can be melted in within the heat treatment temperature. The heat treatment was performed at 1050 ° C. for about 1 hour, and then air-cooled with nitrogen gas to bond the molten wax by solidification.
The brazing material 7 is melted at the heat treatment temperature and has a size capable of flowing into the gap between the tool body 2 and the fixture 4 by capillary action.

Next, in step S14, the attachment holes 4 of 42 M10 tap holes 3 were machined with an equal pitch dimension of 100 mm in the fixture 4 brazed to the tool body 2.

Next, in step S15, a grinding machine was used to finish the processing dimensions to width 80 mm × height 30 mm × length 4140 mm.
The portion of the fixture 4 after the finish processing is in a state in which the solder is melted in the entire outer periphery of the fixture 4 as shown in the photograph shown in FIG. The reason why the width of the solder is wide is that the solder flows into the chamfered portion which was performed when processing the through hole 5 having a diameter of 20 mm in step S11, and the chamfered portion remains after finishing.

Table 1 shows the results of measurement of the longest pitch dimension L of the mounting holes of the product of the present invention processed as described above and the conventional product in which the mounting hole was processed directly in the tool body before heat treatment without using a fixture as a comparative example. Shown in.

Next, a second embodiment of the present invention will be described using FIG. 1 to FIG. 3 and FIG.
As shown in FIG. 5, since it is the same as Example 1 (step S11 of FIG. 4) until it forms the through-hole 5 in the tool main body 2 as step S21, it abbreviate | omits. The difference from the first embodiment is that heat treatment is performed as step S22 before temporarily joining the fixture 4 to the tool main body 2, and then the fixture 4 is temporarily joined (welded) as step S23, and then as step S24. , And this bonding (braking) is performed sequentially.

The heat treatment temperature in step S22 was set to 1050 ° C. for about 1 hour as in Example 1, and then air-cooled with nitrogen gas. Thereafter, in step S23, the fixture 4 was inserted into the through hole 5 of the tool main body 2, and the tool main body 2 and the fixture 4 were temporarily joined. The method is the same as that of the first embodiment (step 12 in FIG. 4) and is therefore omitted.

Next, in step S24, the main joining of the tool body 2 and the fixture 4 was performed. As the method, as shown in FIG. 2 and FIG. 3, first, the brazing material 7 was placed near the center of the upper surface of the fixture 4 and then brazing was performed. The brazing material 7 was an Ag alloy, and the heating temperature was 750.degree.
The brazing material 7 was melted at the heating temperature, and had a size capable of flowing into the gap between the tool body 2 and the fixture 4 by capillary action.

Next, as step S25, 42 fixtures of M10 tap holes 3 were processed with an equal pitch dimension of 100 mm in the fixture 4 brazed to the tool body 2.

Next, in step S26, a grinding machine was used to finish the processing dimensions to width 80 mm × height 30 mm × length 4140 mm.

The error of the longest pitch dimension L of the mounting hole was a value within the same range as Example 1 for the product of the present invention processed as described above.

In the present embodiment, although the tool main body 2 is made of SKD11, the present invention is not limited to this, and other steels such as SKD materials and SKH steels which cause heat treatment dimensional change are included. In addition, although the fixture 4 is SS400, it is not limited thereto in this case as long as it is made of mild steel such as other general structural steel.
In the present embodiment, the brazing material is a Cu alloy or an Ag alloy, but the invention is not limited thereto.

1 processing tool 2 tool main body 2a main body upper surface 2b main body lower surface 3 M10 tap hole (mounting hole)
4 mounting tool 5 through hole 6 point attachment welding 7 brazing material 31 mounting hole 32 on the left end side mounting hole L on the right end side longest pitch dimension

Claims (5)

A manufacturing method of a processing tool having a mounting hole for mounting on a processing machine and the tool body is made of all steel,
Forming a through hole in at least one or more places of the tool body;
Temporarily joining a mild steel fixture having a hardness lower than that of the tool body to the through hole;
Performing a heat treatment after the temporary joining, and performing a main joining of the tool body and the fixture according to the temperature of the heat treatment simultaneously with the heat treatment;
Forming a mounting hole in the fixture after the main bonding;
Method of manufacturing a processing tool provided with A manufacturing method of a processing tool having a mounting hole for mounting on a processing machine and the tool body is made of all steel,
Forming a through hole in at least one or more places of the tool body;
Heat treating the tool body after forming the through hole;
Temporarily bonding a mild steel fixture having a hardness lower than that of the tool body to fix the tool body in the through hole after heat treatment;
Main joining of the tool body and the fixture after temporary joining;
Forming a mounting hole in the fixture after the main bonding;
Method of manufacturing a processing tool provided with The method of manufacturing a processing tool according to claim 1 or 2, wherein the mounting hole is a screw hole. The method according to any one of claims 1 to 3, wherein the temporary bonding is welding. The method according to any one of claims 1 to 4, wherein the main bonding is brazing.