JPS61236421A - Saw blade for reciprocating saw - Google Patents

Abstract

PURPOSE:To enable a saw to cut even a material of high hardness, by constituting a blade part sintering or electrodepositing an abrasive grain, being composed of one or two kinds of diamond and cubic crystal boron nitride, to one end surface and its adjacent both side surfaces of a saw body. CONSTITUTION:A strip-shaped carbon steel saw body 2 adhesively attaches to its base material end part an abrasive grain of diamond and CBN as a sintered material 4 or an electrodeposited layer 5 with no application of setting work. When the sintered material 4 is used for a saw blade, the saw blade, successively disclosing a new abrasive grain even if the surface abrasive grain is detached falling off by cutting many times a material of high hardness, smoothly performs cutting work unless a blade height part (h) wears. On the contrary, when the electrodeposited layer 5 is used, the saw blade, normally having one layer, decreases a life shorter than that of the sintered layer 4 only in that point, but the blade enables sharp cutting to be performed. While the saw blade, if it forms a plurality of the electrodeposited layers by suitably providing a punched hole in a blade part, obtains an equal effect to the sintered material 4.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to so-called reciprocating saws such as jigsaws and saber saws that reciprocate saw blades using mechanical power such as a motor as the driving force, and more specifically, .

The present invention relates to a saw blade for a reciprocating saw that is particularly suitable for cutting highly hard materials.

(Prior art) Reciprocating saws are inexpensive and simple cutting machines that are widely used in everything from household tools to simple maintenance tools in small factories.In particular, reciprocating saws are easy to use and require only a replacement blade, making them easy to use on a do-it-yourself basis. It is widely used as an indispensable tool.

There are saw blades of reciprocating saws that have various shapes of saw blades and support parts, but in the case of jigsaws, generally, as shown in Figure 3, the saw blade is attached to the main body drive part of the reciprocating saw. It has a blade shape with a possible shank part 1, a saw blade 2, and its tooth part 3, and the tooth part 3 is mostly made of steel and has a set type, or one made of crushed tungsten carbide particles brazed. be.

However, since the saw blade of these conventional reciprocating saws has the above-mentioned structure, it is of course impossible to cut extremely hard materials. For cutting etc. 1. At present, the saw blade wears out after cutting just a few pieces of refractory bricks, making it unusable and requiring a new saw blade to be installed, making it impractical.

For this reason, at present, such extremely hard materials can be cut using laser cutting machines, wire electrical discharge machines, or rotating machines bonded with diamond, cubic boron nitride (CBN), fine ceramics, etc. It was necessary to use expensive, mass-produced machinery, which naturally had limits to its use, making it virtually impossible for do-it-yourselfers to use it.

(Object of the Invention) In view of the above-mentioned circumstances, the present invention provides a method for easily making high-hardness materials (such as tiles,
It can cut non-metallic materials such as brick, marble, fine ceramic lumps, optical glass, and metallic materials such as cemented carbide and hardened high-speed steel. It can also cut curves and diagonals, and is portable and inexpensive. The object of the present invention is to provide a saw blade for a reciprocating saw.

(Structure of the Invention) In order to achieve the above object, the saw blade for a reciprocating saw according to the present invention is made of carbon ll! formed into a strip shape by pressing etc. so as to conform to the saw blade standards of each reciprocating saw. The gist of this is that diamond or CBN abrasive grains having a grain size of about 30 to 400 mesh are bonded to the blade portion of the saw blade by sintering or electrodeposition, depending on the purpose.

The present invention will be explained in detail below based on examples.

As described above, the saw blade according to the present invention can be prepared by simply forming the saw blade and the supporting part by cutting a strip of carbon steel by press working. Since there is no need to perform a clam-cutting process like this, there is an advantage that material processing is inexpensive and easy.

Next, as described below, an electrodeposited layer is formed on a portion corresponding to the blade of the cut saw blade using a sintered body of diamond and/or CBN abrasive grains using an appropriate adhesive, or by electrodeposition. let In this case, it is preferable to use CBN abrasive grains for cutting steel materials, and use diamond abrasive grains for cutting other materials.

Now, the semi-finished product which has undergone electrodeposition or adhesion of the sintered body is further subjected to secondary processing by pressing as necessary, and is finished into a product with a shape and size suitable for installation on each reciprocating saw.

As shown in FIGS. 1 and 2, the saw blade of the present invention has a sintered body 4 or an electrodeposited material on the edge of the base material of the strip-shaped carbon steel saw blade 2 without performing a shaving process. Diamond or CBN abrasive grains are bonded as layer 5, so the abrasive grains are exposed on the edge surface, and the abrasive grains are present over a thickness equivalent to the width of the cut. It can be used without any problems. Especially in the case of sintered bodies, even if a high-hardness material is cut many times, even if the abrasive grains on the surface are lost during cutting, new abrasive grains will be exposed one after another, so the high part of the blade As long as h (usually 2 to 5 m+, see Figure 1) is not worn out, cutting work can be carried out smoothly. On the other hand, in the case of an electrodeposition layer, it is usually one layer.

In this respect, the life of the saw blade is shorter than in the case of sintered bodies, but sharp cuts are possible, and for special applications, more than one electrodeposited layer can be produced.

Alternatively, if a hole of an appropriate shape such as a circular or polygonal shape is formed by punching and electrodeposited on the part corresponding to the blade of a strip-shaped carbon steel saw blade, as shown in FIG. Since it is possible to form a plurality of electrodeposited layers 5.5', the same effects as the sintered body 4 can be expected.

(Example 1) First, depending on the use of the saw blade product, the concentration level is 25 to 150%.
(100% concentration = 4.4 carats/cn+') Diamond abrasive grains (80 to 100 meshes) and sintering aids (e.g., those mainly composed of Cr, W, and Ni) are uniformly applied. After being dispersed, it was placed in a pre-prepared mold and heated to a temperature of 8o by hot pressing.

~11oO℃ degree, pressure 200~400kg/c+o
A sintered body having a predetermined size and a height of several h 11fi+ was produced.

In addition, in the production of this sintered body, only sintering is performed first, and then
A cold pressing method may also be used, but in this case, a press pressure of several tons/cm'' is required.

Further, as shown in FIG. 1(b), the mold used has a shape capable of forming a groove portion into which the end of the base material 2 can be inserted into the sintered body 4.

Next, the sintered body 4 is brazed to the end of the base material (thickness t = 0.9 mm) 2, which has been completely degreased by pressing a strip of carbon steel in advance, using a metal bond.
Created a saw blade.

Of course, in this case, the sintered body 4 and the base material 2 may be bonded together by resin bonding in addition to metal bonding, depending on the application.

Adhesives such as vitrified bond can be used, but it goes without saying that it is necessary to select abrasive grains suitable for each adhesive.

In the above example, diamond abrasive grains were used, but when a saw blade was made in the same manner as above using CBN abrasive grains, a good product was obtained without any problems.

When each product (blade length approximately 70 mm) made using the above method was attached to a reciprocating saw and a cutting test was conducted, ■ Saw blade using sintered diamond (concentration rate 75%) as the abrasive grain (blade height h = 3 mm) Thickness 110ll1, length 10 using
A 0 mm thick cemented carbide (main components: approximately 90% WC and approximately 10% Co) was cut. After cutting 50 pieces (500 cm in total), the degree of wear was examined using a microscope, and only some diamonds were found to have fallen off and some wear was observed.

■ In addition, products using CBN abrasive grains have a HRC66
The workpiece is a hardened high-speed steel product with an ioam thickness.
After cutting a total of 300 cm2, the degree of wear was examined using a microscope, and the results were the same as those in (2) above.

(Example 2) In this example, abrasive grains were electrodeposited on the same saw blade base material as in Example 1 using the apparatus shown in FIG. 4 in the steps shown below.

In the figure, 6 is an electrolytic cell, 7 is an anode metal plate, 8 is a cathode chamber, 9 is a frame with acid-resistant cloth or filter paper tightly attached to it, and 1
0 is an anode chamber, 11 is an abrasive grain, 12 is a pump, 13 is an injection tube, and 14 is a power source.

■ Mask the parts of the saw blade base material 2 where abrasive grains do not need to be electrodeposited using a plating resist or ink in the usual way.■ Next, perform electrolytic degreasing or chemical degreasing in the same way as the usual pre-plating treatment in 2. and then pickling.

■ Perform base plating under the following conditions. Note that this may be performed as necessary and may be omitted.

Electrolytic liquid salt FIL 100~200gIQ nickel chloride 200~300g/Q Electrolysis conditions Temperature Room temperature cathode current density 3~20 A/dm"
1 to 5 minutes ■ Immediately wash with acid and water.

■ Perform composite plating to fix abrasive grains under the following conditions. First, a required amount of diamond abrasive grains 11 of approximately 40μ or more, which have been made hydrophilic by boiling water treatment or the like, are inserted into the cathode chamber 8, so that the base material portion to which the abrasive grains are to be fixed is completely buried in the abrasive grain layer. Do it like this. Next, a required amount of plating solution having the following bath composition is poured into the anode chamber 10 and cathode chamber 8 of the electrolytic cell 6, and after raising the temperature to an appropriate temperature, a part of the anolyte is poured into the cathode chamber 8 through the injection pipe 13 by the pump 12. Inject the entire surface in a shower-like manner from above.

Bath composition: nickel sulfate 2 fathoms 0-320 nickel chloride
45-90 g/Q Boric acid 30-80 g IQ brightener Appropriate amount Electrolysis conditions Temperature 30-@70"l: pH 2.
0 to 4.5 Cathode current density 1 to 12 A/d m” Electrolysis time
Approximately 30 to 90 minutes (varies significantly depending on the grain size of the abrasive grains) ■ Finishing electrolysis: The base material that has undergone eutectoid electrolysis to fix the abrasive grains is either the same electrolytic bath in which the abrasive grains were removed from the cathode chamber 8, or
Alternatively, final electrodeposition is performed in a separately prepared electrolytic bath using an electrolytic bath having the same composition and electrolytic conditions as in (1) above. The electrolysis time in this case varies greatly depending on the particle size of the abrasive grains, but depending on the application, the coverage of the abrasive grains with the plated metal is approximately 60 to 90%.
Determine the time so that 1! Solve.

■ The base material that has undergone finishing electrolysis has an electrodeposition layer 5 on the edge of the base material.
If the hydrogen embrittlement caused by trace amounts of hydrogen occluded by the plating is considered to be a problem, it is heat-treated at 200° C. for about 4 hours.

■ If any resist ink remains on the base material, peel it off and, if necessary, wash with thinner to completely remove the resist ink.

The obtained saw blade product has diamond abrasive grains adhered with a nickel plating layer only on the end face of the blade portion and both adjacent surfaces thereof.

Incidentally, a saw blade product was also produced by the above process using CBN as the abrasive grain.

Next, a cutting test was conducted on each saw blade product in the same manner as in Example 1. In the case of diamond abrasive grains, the cutting properties were extremely good compared to the case of sintered bodies, but due to electrodeposition, A gradual decrease in cutting speed was observed as wear progressed from the middle of the test. but.

Even after the test was completed, it was still usable. Also, C
In the case of BN abrasive grains, the results were similar to those of the cutting test of the CBN sintered body of Example 1.

In this example, electrodeposition was performed for each saw blade, but
Industrially, it is more economical to perform electrodeposition on a plurality of base materials, then cut them one by one and perform secondary processing to give them a predetermined final shape.

(Effects of the Invention) As detailed above, according to the present invention, a saw blade for a reciprocating saw that can easily cut any material with high hardness can be provided at a low cost, so it can be easily used in a portable manner. Reciprocating saws can be used to their fullest extent, from home do-it-yourself work to small factories and small businesses, and the effects are extremely significant, such as further expanding demand for reciprocating saws.

[Brief explanation of drawings]

1 and 2 show a saw blade according to an embodiment of the present invention, each time (,) is a side view, (b) is an elevation view, and FIG. 3 is a side view of a conventional saw blade. FIG. 4 is an explanatory diagram showing an apparatus used for manufacturing a saw blade according to an embodiment of the present invention by electrodeposition, and FIG. 5 is a saw blade according to an embodiment of the present invention, the blade portion of which is shown in FIG. FIG. 3 is a partially enlarged side view of a saw blade provided with a plurality of electrodeposited layers. 1...Shank part, 2...Saw blade. 3...Tooth portion, 4...Sintered body. 5...Electrodeposition part.

Claims (1)

[Claims] In the saw blade of a reciprocating saw, which uses mechanical power such as a motor as the driving force to reciprocate and perform cutting with the blade part of the saw blade, one end surface of the saw blade is made by cutting a strip of carbon steel by press working, etc. A saw blade for a reciprocating saw, characterized in that the blade portion is formed by adhering abrasive grains made of one or two of diamond and cubic boron nitride to both sides near the same by sintering or electrodeposition.