JPH07178674A - Manufacture of helical wheel - Google Patents

Abstract

PURPOSE:To easily form an abrasive grain layer having a thickness by forming a ring member, by which the helical abrasive grain layer is partly formed, separately from a main unit part, and partly cutting this ring member deformed helically and secured to the grinding wheel main unit, in the case of manufacturing a helical wheel provided with the helical abrasive grain layer in the periphery. CONSTITUTION:An abrasive grain layer fitting recessed part 1a is helically formed in the periphery of a grinding wheel main unit part 1 consisting of aluminum iron, cemented carbide, etc. An abrasive grain layer, in which a protrusive part fittable to the recessed part 1a of the main unit part 1 is formed in an internal peripheral surface, is formed of a plurality of ring members P1 using diamond or CBN as a super abrasive grain. That is, the ring member P1 is partly cut by using a cutting machine, to apply forces F1, F2 in a vertical direction to both end parts of a cut part, and the ring member P1 is deformed so as to form partly a helical shape. By securing this ring member P1 fitted to the helical recessed part 1a of applying an epoxy system bonding agent, a required helical wheel is manufactured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a spiral wheel, and more specifically, a spiral abrasive grain layer on the outer circumference of a main body of a grindstone used for grinding a hole of alumina ceramics or grinding a razor blade. And a method for manufacturing a spiral wheel having the following.

[0002]

2. Description of the Related Art As such a spiral wheel, for example,
U.S. Pat. No. 3,461,616 describes a spiral wheel for grinding a razor blade edge, which is intended for general grindstones such as GC and WA, and is also described in Japanese Utility Model Publication 4-7.
Japanese Patent No. 6361 describes a spiral wheel in which a spiral grindstone portion is formed on the outer periphery of a base metal by electrodeposition.

Since the spiral wheel described in US Pat. No. 3,461,616 uses GC or WA, the spiral groove can be easily trued by an ordinary dresser. However, on the other hand, the grinding ability is inferior to that of the superabrasive wheel, and the abrasion is severe and the shape retention ability is low, so that it is necessary to frequently correct the shape of the grindstone.

As a countermeasure against this, it is possible to use a metal bond containing superabrasive grains, a resin bond, a vitrified bond, or the like as the abrasive grain layer.
Since it is excellent in abrasion resistance, it is excellent in shape retention but, on the other hand, it is extremely difficult to truing, and it is extremely difficult to form a cylindrical molded product in a spiral shape.

In this respect, according to the method disclosed in Japanese Utility Model Laid-Open No. 4-76361, the base metal is preliminarily processed into a spiral shape, and the surface thereof is plated with superabrasive grains by electrodeposition. It is not necessary to form a groove by truing, and it is possible to easily obtain a spiral wheel having a superabrasive grain layer having excellent wear resistance.

[0006]

However, the superabrasive grain layer formed by electrodeposition is basically only one layer of the abrasive grains, and generally, the graininess of the abrasive grain layer during grinding cannot be expected. Therefore, since only one abrasive grain layer is electrodeposited on the wheel, the thickness of the abrasive grain layer is limited to 400 μm, and a thick abrasive grain layer cannot be formed. For this reason, in the spiral wheel in which the superabrasive grain layer is formed by electrodeposition, the life of the spiral wheel is affected by the thickness of the plating layer, and the abrasive grain layer portion is quickly worn out and cannot be used.

Therefore, the problem to be solved in the present invention is to obtain a method for manufacturing a spiral wheel in which a thick abrasive grain layer can be easily obtained and which can be used for a long time.

[0008]

In order to solve the above problems, the present invention provides a spiral wheel provided with a spiral abrasive grain layer on the outer periphery of a main body of a grindstone formed of aluminum, iron, cemented carbide or the like. The method of manufacturing a ring member according to claim 1, wherein a ring member made of a resin bond, a metal bond, or a vitrified bond that forms a part of the spiral abrasive grain layer is formed separately from the main body by firing. After the portion is cut, the ring member is deformed into a spiral shape to fix the ring member to the grindstone body portion.

Here, in a resin bond having a relatively high elasticity, a circular ring member is partially cut and deformed so as to form a part of a spiral, and in a metal bond or a vitrified bond having poor elasticity. Is cut at 2 to 4 points and fixed to the grindstone body.

In addition, a concavo-convex portion for fitting may be formed on the joint surface of the grindstone body and the ring member in order to improve the positioning of the ring member and the adhesive force with the grindstone body.

[0011]

In the present invention, since the spiral abrasive grain layer portion is formed by a plurality of ring members obtained by firing separately from the main body, the spiral shape can be obtained by fixing the ring member to the main body of the grindstone. In addition, it does not require time-consuming groove processing such as spiral formation by truing, and an abrasive grain layer much thicker than electrodeposition can be formed relatively easily.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The features of the present invention will be specifically described below with reference to the embodiments shown in the drawings.

FIG. 1 (a) is a front view of the spiral wheel, FIG. 1 (b) is a sectional view of the same, and FIG. 2 is an explanatory view showing a procedure for manufacturing the spiral wheel shown in FIG.

Referring to FIG. 1, reference numeral 1 denotes a main body of a grindstone formed of aluminum, iron, cemented carbide or the like, and a concave portion 1a for fitting an abrasive grain layer 2 is spirally formed on the outer periphery of the main body 1. Has been formed. The abrasive grain layer 2 is formed with a convex portion 2a which can be fitted in the concave portion 1a of the main body portion 1 on the inner peripheral surface, and uses diamond or CBN as superabrasive grains and resin bond, metal bond or vitrified bond as the bond material. It is composed of a plurality of ring members described later.

Next, a specific manufacturing procedure will be described with reference to FIG.

First, as shown in FIG. 2A, a ring member P ₁ is formed by a predetermined superabrasive grain and a bond material by a powder method of mixing, molding and sintering according to a conventional method.

Next, as shown in FIG. 2 (b), a part of the ring member P ₁ is cut by using a cutting machine, and as shown in FIG. 2 (c), both ends of the cut portion are vertically moved. Forces F ₁ and F ₂
And the ring member P ₁ is deformed so as to form a part of a spiral shape. In this case, in the case of a resin bond which is relatively rich in elasticity, one cutting portion is used, and in the case of a metal bond and a vitrified bond, two to four cutting portions are used to facilitate fitting and bonding.

In this state, as shown in FIG. 2 (d), the ring member P ₁ is fitted and fixed in the spiral recess 1a of the grindstone main body 1 coated with an epoxy adhesive as an adhesive.

By repeating this in sequence, the spiral wheel shown in FIG. 1 is manufactured. Epoxy adhesive is introduced into the joint end surface of each ring member in order to reduce the change of the grinding pressure applied to the work material during grinding and the impact force, thereby eliminating the step difference between the ring members. It can be done.

FIG. 3 (a) is a front view showing another embodiment of the spiral wheel, and FIG. 3 (b) is a sectional view of the spiral wheel shown in FIG. 3 (a). In this embodiment, a grindstone is used. Body 1
A spiral projection 1b is formed on the outer periphery of the above, and a concave portion 1c for fitting an abrasive grain layer is further formed on the outer peripheral surface thereof, and the abrasive grain layer 2 is fixed to this concave portion 1c.

By thus forming the spiral protrusion 1b, it is possible to mesh two spiral wheels as shown in US Pat. No. 3,461,66. Become.

In the above embodiment, the shape of the abrasive grain layer is T-shaped, but of course it is not limited to this, and FIG.
The V shape as shown in (f), the semicircular shape, or a combination thereof can be used. The one shown in FIG. 4 has an excellent property that the area of the abrasive grain layer involved in adhesion can be made larger than that of the T-shaped one and the adhesive strength of the abrasive grain layer is increased.

Experimental Example 1 A spiral wheel having a wheel outer diameter of 50 mm, a wheel thickness of 50 mm, an abrasive grain layer width of 5 mm, an abrasive grain layer pitch of 8 mm (3 mm spiral groove) and an abrasive grain layer thickness of 3 mm was manufactured by a conventional method. , Diamond # 140: 50% by weight,
Resin bond: 50% by weight abrasive grain layer, molding temperature 150-250 ° C., molding pressure 200-500 kgf / c
² straight wheels with an outer diameter of 50 mm, a wheel thickness of 25 mm, and an abrasive layer thickness of 3 mm
Individual molding was carried out, and it joined in series (it adhere | attaches using an epoxy adhesive or a bolt), and manufactured the straight wheel of wheel outer diameter 50mm, wheel thickness 50mm, and abrasive grain layer thickness 3mm. Then, using a C80H vitrified grindstone (grinding stone outer diameter 150 mm, thickness 3 mm), CNC
Using a cylindrical grinder, spiral groove 3mm, spiral groove pitch 8mm
The groove was grinded in the above to produce the above spiral shape.

However, this method requires an expensive grinding machine such as a CNC cylindrical grinding machine, and the amount of the removed abrasive grains for forming the spiral groove on the straight wheel was 37.5% of the whole. .

On the other hand, according to the method of this embodiment, an abrasive grain layer having the same composition was formed under the same forming conditions, and an outer diameter of 5 was obtained.
0 mm, abrasive grain layer width 5 mm, usable abrasive grain layer thickness 3 m
m, and 7 ring-shaped abrasive grain layers having a thickness of 1 mm in the embedded portion were manufactured. After that, spiral groove (groove width 1 mm, groove pitch 8
mm), and was adhered by the above method to the above-mentioned spiral wheel.

As a result, an expensive grinder such as a CNC lathe was unnecessary, and the amount of the abrasive grains discarded was very small, about 1%.

Experimental Example 2 Diamond # 140: 10% by weight, metal bond: 9
An abrasive grain layer consisting of 0 wt% is formed at a forming temperature of 600 to 800 ° C.,
Molding is carried out at a molding pressure of 200 to 500 kgf / cm ² , and a wheel outer diameter of 50 mm, a wheel thickness of 50 mm, an abrasive grain layer width of 5 mm, an abrasive grain layer thickness of 3 mm, and an abrasive grain layer pitch of 8 mm (3 mm spiral groove) are formed by the above method. On the other hand, a spiral wheel was manufactured. On the other hand, as a comparative example, an electrodeposited spiral wheel in which an abrasive grain layer of diamond # 140 having the same shape and an abrasive grain layer thickness of 150 μm was formed was produced.

Using this, the alumina ceramics were subjected to hole grinding.

The result shows that the spiral superabrasive wheel of the same shape produced by electrodeposition loses the abrasive layer in 3 days to 1 week.
It became impossible to use, but the product of this example has an abrasive grain layer thickness of 3 mm.
And could be used for 2-3 months.

Experimental Example 3 An abrasive grain layer consisting of CBN # 3000: 50% by weight and resin bond: 50% by weight was molded at a molding temperature of 150 to 250 ° C. and a molding pressure of 200 to 500 kgf / cm ² , and by the above method. A spiral wheel having a wheel outer diameter of 200 mm, a wheel thickness of 100 mm, an abrasive grain layer width of 6 mm, an abrasive grain layer thickness of 3 mm, and an abrasive grain layer pitch of 16 mm (spiral groove of 10 mm) was manufactured. Produced a GC whetstone.

When the razor blade was ground by this, the result was that the GC grindstone had a rapid shape collapse of the grindstone due to grinding, and it was necessary to modify the shape of the grindstone once every 0.5 to 1 day. The shape of the example product is small, and it is 1
It was possible to grind stably with one dressing.

Further, a CBN # 3000 spiral wheel having the same shape was manufactured by electrodeposition, but it could not be used favorably in the following points.

(1) Since the precision (roundness, concentricity of outer shape and inner diameter, etc.) of the main body metal base before electrodeposition is required to be about 1 μm (dressing and truing are not performed on the electrodeposition wheel) Therefore, in order to minimize the wobbling of the wheel, a highly accurate body base metal is required.) It was very difficult to manufacture the base metal base.

(2) Electrodeposited foil has abrasive grains adhered to the main body by electrodeposition plating, so that the wheel (abrasive grain layer) has a high elastic modulus and the surface roughness is rougher than that of a resin bond wheel having a low elastic modulus. It was

(3) Since the electrodeposition wheel has a single layer of abrasive grains (abrasive grain layer thickness of 6 μm), the abrasive grain layer disappeared after 30 minutes and the wheel became unusable.

[0036]

According to the present invention, the following effects can be obtained.

(1) Since the spiral abrasive grain layer portion is formed by a plurality of ring members obtained by firing separately from the main body, a spiral shape can be obtained by fixing the ring member to the main body of the grindstone, and the truing This eliminates the need for labor-intensive groove machining such as the spiral shape formation by the method, and makes it possible to form an abrasive grain layer much thicker than electrodeposition relatively easily.

(2) Since it has a thickness of the superabrasive grain layer as compared with the electrodeposition wheel, it can be used for a long time.

(3) In the case of electrodeposition, it is difficult to form fine abrasive grains, but it can be formed in this patent.

(4) Compared with general grindstones such as WA and GC, since superabrasive grains are used, sharpness and shape retention are excellent, and long-time dressing is not required, and work cost can be reduced.

[Brief description of drawings]

1A is a front view of a spiral wheel, and FIG. 1B is a sectional view of the same.

FIG. 2 is an explanatory view showing a manufacturing procedure of the spiral wheel shown in FIG.

3A is a front view showing another embodiment of the spiral wheel, and FIG. 3B is a sectional view of the spiral wheel shown in FIG.

FIG. 4 is a sectional view of an abrasive grain layer showing another example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Whetstone main body 1a Recess 2 Abrasive grain layer 2a Convex P ₁ Ring member

Claims (3)

[Claims] 1. A method of manufacturing a spiral wheel comprising a spiral abrasive grain layer on the outer periphery of a main body of a grindstone formed of aluminum, iron, cemented carbide or the like, wherein a part of the spiral abrasive grain layer is provided. Forming a ring member separately from the main body portion, cutting a part of the ring member, and then deforming the ring member spirally to fix the ring member to the grindstone main body portion. Manufacturing method. 2. A concavo-convex portion for fitting is formed on a joint surface between the grindstone main body portion and the ring member.
A method of manufacturing the spiral wheel as described. 3. The method for manufacturing a spiral wheel according to claim 1, wherein the abrasive grain layer is one of a resin bond, a metal bond and a vitrified bond.