JPS61255780A - Production of vibration-proof base plate - Google Patents

Abstract

PURPOSE:To form inexpensively a vibration-proof base plate having required characteristics such as strength and vibration-proof characteristic by exerting a specific amt. of load to the parts to be joined of three sheets of heated plates and joining the plates. CONSTITUTION:The steel plate-copper plate-steel plate are positioned in this order and are stacked in such a manner that the copper plated part contacts with the copper plate. The plates are heated to a prescribed temp. while an atmosphere to prevent the surface to be joined from being contaminated by oxidation, etc. is maintained. About >=50kg load for each 1cm<2> of the parts to be joined is exerted to three sheets of such heated plates by which the plates are joined. The vibration-proof base plate having the excellent characteristics is thus inexpensively formed without using a special installation.

Description

[Detailed Description of the Invention] (Industrial Application Field) - Diamond saws used for stone cutting or paved road repair, segment saws used for metal cutting, etc. are used to improve the working environment and reduce noise pollution. For the purpose of preventing vibrations, substrates having anti-vibration properties have come to be used. The present invention relates to a method of manufacturing a vibration-proof substrate used for such applications.

(Prior art) Metal materials with anti-vibration properties include flake graphite cast iron, steel plates with plastic sandwiched between them, and other metal materials that exhibit vibration absorption at the interface between a parent phase and a second phase or between a metal and a viscous substance. A composite type that utilizes flow, a ferromagnetic type that utilizes magneto-mechanical hysteresis loss associated with domain wall movement represented by high Or steel and high Cr-At steel, and M? Dislocation type, Mn-Cu, which utilizes the hysteresis loss that occurs when dislocations, represented by alloys, break away from fixed points.
A variety of types are known, such as the transformation twin boundary of thermoelastic martensite represented by alloys, Ni-Ti alloys, etc., and the twin type that utilizes the hysteresis loss accompanying the movement of the boundary between the parent phase and the martensite phase. However, for the purpose of use mentioned above, a substrate made of heat-treated steel plate bonded to a thin copper plate is used due to reasons such as strength, temperature rise during use, ease of manufacturing into a disk shape, and cost. This is the actual situation. (Problem to be solved by the present invention) A plate in which two steel plates and a copper plate are bonded is made by, for example, sandwiching a copper plate between two sheets and sealing the surrounding area by heating and melting it.
It is possible to produce a substrate by hot rolling, and if necessary cold rolling to finish it, and if it is processed and heat treated, it is possible to obtain a substrate with excellent strength and bonding strength. It is not possible to obtain sufficient characteristics on the surface.

From the viewpoint of vibration-proofing effects, it is preferable to use a method in which only the main parts are joined, as shown in FIG. A flat copper plate with a clean surface is sandwiched between steel plates whose surfaces have been processed to a flat finish and have been thoroughly cleaned, and the surface is heated to 100 pf / - If the welding is carried out using a pressure higher than -, sufficient bonding strength can be obtained, and it is not impossible to bond only the main parts as shown in FIG. However, if all the steel plates before heat treatment are joined in this way and then heat treated, it is extremely difficult to prevent and straighten the deformation during heat treatment.
If heated to a higher temperature, the hardness and strength of the steel plate (generally used at about HRC 40) will decrease. Further, even if pressure welding is carried out by heating to, for example, about 450° C. without reducing hardness or strength, sufficient bonding strength cannot be obtained at the steel-copper interface.

The present invention eliminates the drawbacks of the methods described above and provides a method for manufacturing a vibration-isolating substrate having required properties such as hardness, strength, and vibration-isolating properties at a low cost using a simple method.

(Means for Solving the Problems) Therefore, the present invention provides a method for manufacturing a disc-shaped substrate having anti-vibration properties, in which a disc-shaped steel plate is processed into a required shape and size after being subjected to required quenching and tempering. The process of manufacturing;
A step of applying copper plating to the required portions of the above-mentioned steel plate, a step of processing the copper plate having the required thickness into almost the same dimensions and shape as the disc-shaped steel sheet, and a step of applying copper plating to the steel plate so that the copper plated portion is in contact with the copper plate. The process of positioning and stacking the copper plate and the steel plate in that order, and the process of heating the surfaces to be joined at a temperature of approximately 350°C or higher and under conditions that do not reduce the strength of the steel plate, while maintaining an atmosphere free from oxidation and other contamination. The method for manufacturing a vibration-proof substrate includes the step of joining three plates by applying a load of about 509 or more per 1- of the part to be joined.

(Operations and Effects) The basic technical content of the present invention will be explained in more detail, including its operations and effects.

Firstly, the vibration isolation board has a structure in which thin copper plates are completely bonded between heat-treated steel plates, and in order to improve the vibration isolation effect, the steel plates and copper plates are bonded only in the required areas, as shown in Figure 1. It is something to do.

The second purpose is to eliminate the difficulty of preventing and correcting deformation during heat treatment due to heat treatment finishing of the steel plate before joining the steel plate and copper plate and heat treatment after joining.

Thirdly, the heating during welding must be at a temperature of 350° C. or higher that does not substantially reduce the strength of the steel sheets imparted by the heat treatment in the previous step, and which is sufficient for joining.

The fourth is to perform the bonding in the pressure welding process at the copper-copper interface rather than the steel-copper interface.

The reason for this is that, as mentioned above, heating conditions during welding are selected so that the strength of the steel plate does not substantially decrease, but the steel plate currently in use is carbon tool steel with a carbon content of about 07%, and its hardness is about HRC 40. Therefore, if the copper plate is heated uniformly and the holding time is at least about 10 minutes, taking into account the time required for the work, the heating temperature needs to be set to about 550° C. or lower. When pressure welding is carried out at such heating temperatures, sufficient bonding strength cannot be obtained at the steel-copper interface. Sufficient bonding strength can be obtained if all bonding is performed at the copper-copper interface. In order to satisfy this requirement, it is necessary to perform copper plating as a pre-pressing process. In addition, in order to obtain sufficient bonding strength, it is necessary to maintain an atmosphere in which the bonding surfaces are free from oxidation and other contamination until the bonding is completed.

The fifth method is to apply a load of about 50 LP or more to each part to be joined.

As mentioned above, bonding is performed at the copper-copper interface, and the temperature is set at 350°C or higher, which is higher than the recrystallization temperature of copper, so the bonding surfaces are sufficiently small and clean, and the surfaces with good flatness are pressed together. In this case, sufficient bonding can be achieved even if pressure welding is performed with a small load such as 50"F, 7"/-, for example, a load of about ZStσ/-. However, when bonding objects with dimensions as shown in Embodiment 2, which are used as diamond saw substrates, etc., even those that have been finished in advance as in the present invention may be subject to dimensional tolerances in thickness, bending, twisting, or heating. Considering deformation, etc., it is hard to say that it is an ideal flat surface. Furthermore, it is extremely difficult to maintain an ideal uniform plating thickness. In addition, since the heated steel plate and copper plate are pressurized, the temperature decreases due to heat transfer from the pressure tool, so the time available for joining near the heating temperature must be shortened. The above conditions were set in consideration of actual test results.

The sixth method is to apply steel plating only to the necessary parts. One of the reasons for this is that the vibration-isolating substrate of the present invention requires only the necessary parts to be bonded in order to improve the vibration-isolating properties, so there is no need for copper plating on other parts. It is also possible to join only the required portions by plating the entire surface and pressurizing only the required portions, but this is not preferred as it leads to deterioration in shape and dimensional accuracy for the reason shown in FIG.

When the steps necessary to express the basic technical contents of the present invention explained above are arranged in order, the contents are shown in the claims. FIG. 3 schematically shows this.

(Example) Next, embodiments of the present invention will be described in more detail.

Example 1: A steel plate of TIS standard 8 and 5 was quenched and tempered and HRC
Cut out a 20m x 20mm test piece from the 60% material, grind both sides to a thickness of 1.5u, and then cut out a sample of about 10μ on one side.
A sample with copper plating of 20.m and a sample without copper plating were prepared, and 20.m of copper was placed between the two test pieces. X20. Xo
The treatment shown in Fig. 4(a) was carried out using a test piece which was sandwiched between two copper plates and pressure-bonded in a heating furnace to create a non-oxidizing atmosphere by introducing nitrogen gas, and then pressurized to a size of 151J The breaking strength was measured using a tool, and at the same time the hardness of the steel plate was measured.

A pressing force of 50 sf/d and 100 sf/- was selected as the bonding condition for the test pieces. Figure 4(b) shows the results.
It is. As shown in the figure, for example, the heating temperature is 700℃ and the pressing force is 100"pf/- for the specimen without copper plating.
Sufficient bonding strength can be obtained under these conditions, but the temperature at which bonding can be achieved requires a temperature of 600°C or higher in all cases, and the hardness of the steel plates is HRC! It became less than 40.

On the other hand, for copper-plated specimens, the temperature is 350°C or higher as stated in the claims and the strength of the steel plate does not decrease (in the case of this investigation, the temperature is 550°C or lower with hardness HRC!40 or higher). ) at a pressure of 10 oLf/- from 2.3 to
3.1 IP-m, 1.0 to 1.6 at 501σ/-
The fracture torque of IP-m was shown, and the effectiveness of steel plating and the appropriateness of the pressing force and heating conditions shown in the claims were confirmed.

Example 2 An outer diameter of 390. X hole diameter 50
A vibration-proof substrate of wJ×thickness 2.5u was manufactured.

Prepare two steel plates (thickness 1.5 m) of J Engineering S standard 8 to 5 processed to an outer diameter of 390 x hole diameter of 501 ul and a steel plate (thickness o, 1 rxx) processed to the same shape, and After quenching, it is tempered at 450℃ while being held in a jig, and ground to a surface roughness of about 2 o, s B on one side of the steel plate, which corresponds to the main part of the board (outer circumference and 30 to 40 m width around the hole). The sand-inch board, which is temporarily fixed with metal fittings, is placed in an N2 atmosphere. The board was heated to 550°C for 10 minutes, the temporary fixing metal fittings were removed, and the board was immediately joined within 2 minutes while being pressed with 509j7d. For comparison, the following samples were also measured at the same time.

(1) Under the above-mentioned manufacturing conditions, the heating temperature in (■) was set to 700°C.

(11) Full-surface bonding without copper plating at a heating temperature of 700°C.

(ili) A copper plate sandwiched between two sheet bars, hot-rolled, cold-rolled, and then heat-treated to have a hardness of HRO40.

θV) T34CR steel with anti-vibration properties.

(v) Y Engineering S SK5 steel plate.

The dimensions of the main parts of these comparison specimens were the same as those of the specimens prepared by the method of the present invention. Furthermore, the anti-vibration characteristics of these specimens are shown in Figure 5.

It was confirmed that this sample exhibited superior vibration damping properties compared to each sample except comparative sample (1) (heated at 700° C.).

As specifically shown in the detailed description and examples of the present invention above, according to the method of the present invention, a vibration-proof substrate with excellent characteristics can be manufactured at low cost without using special equipment, and industrially. It can be said that this is an effective invention.

[Brief explanation of the drawing]

FIG. 1 shows a mold for pressure-welding the main parts of a substrate for carrying out the manufacturing method of the present invention, and a shape of a vibration-proof substrate manufactured by the present invention. FIG. 2 is an explanatory diagram schematically showing the problems that occur when the entire surface of a steel plate is plated with copper and only the required parts are pressure-welded. FIG. 3 is a block diagram showing an outline of the process of the present invention. Figure 4 (
a) shows the method of testing the bonding strength in Example ①, and b) is a graph showing the results. FIG. 5 shows the test results of the anti-vibration characteristics in Example (2). Agent Patent attorney Jun Kawauchi $1 Figure 2 ptJ3 Figure 15 Procedural amendments April 2, 1980 Manabu Shiga, Commissioner of the Patent Office 1゜ Indication of the case 1985 Patent Application No. 98806 2, Invention Name of Manufacturing Method for Anti-vibration Substrate 3, Relationship to the Amendment Case Patent Applicant Name (519) Fujikoshi Co., Ltd. 4, Agent Address World Trade Center Building, 2-4-1 Hamamatsucho, Minato-ku, Tokyo 25th Floor Voluntary Release 6, Drawing subject to correction Plane 7, Contents of correction Figure 5

Claims (1)

[Claims] A method for manufacturing a disc-shaped substrate having anti-vibration properties includes a step of manufacturing a disc-shaped steel plate that is processed into the required shape and dimensions after being subjected to the required quenching and tempering, and copper plating on the required portions of the above-mentioned steel plate. a step of processing a copper plate having the required thickness into a size and shape that are almost the same as a disc-shaped steel plate;
The process involves positioning and stacking the steel plates - copper plates - steel plates in this order so that the copper-plated parts are in contact with the copper plates, and heating at approximately 350°C while maintaining an atmosphere where the surfaces to be joined are free from oxidation and other contamination.
The process of heating under conditions that do not reduce the strength of the steel plate, and the 1 cm of the part where the three heated plates are to be joined.
A method for manufacturing a vibration-proof substrate, including a step of bonding by applying a load of about 50 kg or more to each.