JPH1066790A - Manufacture of cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture using a simple method a blade with an edge which has a smaller angle than those produced by conventional methods. SOLUTION: A blade base 2 having an edge 1 is coated at its sliding surface 3 with an edge-forming material in such a way that the material circles at least the side face 4 of the edge 1; after the base 2 is coated in such a way that the circling coating layer 5 gets thinner as it leaves the sliding surface 3, the coating layer 5 on the sliding surface 3 is removed to make the angle of the edge 6 smaller than that of the blade base 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a blade having a sliding surface such as an inner blade of an electric razor, a clipper blade, a blade of a lawnmower, and scissors.

[0002]

2. Description of the Related Art Conventionally, in a manufacturing process of an inner blade of an electric razor or a blade having a sliding surface such as a hair clipper blade, a blade base having a general shape without a blade is formed.
The cutting surface is ground by a rotary grindstone, and the sliding surface is finally ground and polished to form a smooth sliding surface with little friction and a sharp cutting edge.

[0003] Here, the blade is formed by grinding with a rotary grindstone, and the blade shape such as a blade angle, a blade length, and a blade pitch is determined by the shape of the rotary grindstone, the contact angle, and the cutting pitch. A smaller blade edge angle is expected to reduce the cutting resistance when cutting an object to be cut and reduce the cutting load, so that the cutting capability is expected to increase.

However, in the cutting and cutting step, the formed blade inherits the trajectory of the rotating grindstone as its shape. Therefore, when the shape of the rotating grindstone is determined and the cutting edge angle is to be reduced, the cutting edge is reduced. It is necessary to make the trajectory line at which the rotary grindstone moves and the contact angle of the blade base before cutting larger, and as a result, if the gap between the adjacent blades is short, the rotary grindstone collides with the adjacent blade. Therefore, the blade pitch must be increased, and the deeper the blade, the narrower the gap between the blades. This has a problem that as the contact angle of the blade base with the rotating grindstone increases, the rotating grindstone collides with an adjacent blade, so that the blade length cannot be shortened. FIG. 3 shows the blade edge angle α, the blade pitch M,
FIG. 4 is a drawing showing the blade length N, and FIG. 4 shows an example of the blade base. 3 and 4, reference numeral 2 denotes a blade base, 1 denotes a cutting edge of the blade base 2, 3 denotes a sliding surface of the blade base 2, and 4 denotes a side surface of the blade base 2.

[0005] In addition, when the angle of the rotary grindstone is increased and the angle of the edge of the completed blade is reduced,
The thickness of the blade base is restricted, and if the thickness of the blade base is small, a problem occurs in the strength of the blade. Further, in the case of a clipper or a blade of a lawn mower, an object to be cut such as hair or grass needs to be introduced to some extent between the blades, so that the blade length needs to be a certain length. In addition, if the blade pitch is too large, too many objects to be cut will be introduced too much, and the cutting load will increase, and cutting will not be possible due to insufficient power or the cutting state will be deteriorated. is there. Therefore,
The blade shape is largely restricted by the thickness of the blade base, the blade length, and the blade pitch. For this reason, conventionally, it has been extremely difficult to reduce the cutting edge angle by ignoring them.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and provides a simple method for manufacturing a blade having a cutting edge having a smaller cutting edge angle than the conventional method. It is an object of the present invention to provide a method of manufacturing a cutting tool that can perform the cutting.

[0007]

In order to solve the above-mentioned problems, a method of manufacturing a blade according to the present invention comprises a blade base 2 having a blade edge 1.
The sliding surface 3 is coated with a material for forming a cutting edge portion so as to wrap around at least the side surface 4 of the cutting edge 1, and the coating layer 5 that has wrapped around becomes thinner as the distance from the sliding surface 3 increases. After doing
The present invention is characterized in that the coating layer 5 on the sliding surface 3 side is removed so that the cutting edge angle of the cutting edge 6 of the coating layer 5 is smaller than the cutting edge angle of the blade base 2. By employing such a method, the blade edge portion 6 having a blade edge angle smaller than the blade edge angle of the blade base 2 can be obtained.

[0008] It is also preferable to coat the material for forming the blade edge portion by a plasma CVD method. By adopting such a method, the coating becomes 300
It can be performed at a low temperature of not more than 0 ° C. and the thermal effect on the blade base 2 is lessened. In addition, the edge portion of the blade base 2 having at least the edge 1 of the blade base 2 having the edge 1 and the sliding surface 3 is formed by electrolytic plating so that the edge 1 portion has a larger plating film thickness than the other portions. After that, it is also preferable that the coating layer 5 on the sliding surface 3 side is removed to make the cutting edge angle of the cutting edge 6 of the coating layer 5 smaller than the cutting edge angle of the blade base 2. By employing such a method, the cutting edge portion 6 having a smaller cutting edge angle than the cutting edge angle of the blade base 2 can be obtained at low cost and with high productivity.

Before grinding and polishing the sliding surface 3, it is also preferable to grind the coating layer 5 formed on the side surface 4 to such an extent that the coating layer 5 is not completely removed. By employing such a method, the side surface 4 is added to the grinding of the sliding surface 3 to obtain a sharp cutting edge 6 by double-side grinding. It is also preferable that the coating is applied only to the vicinity of the edge of the blade base 2. By employing such a method, the contact area of the sliding surface 3 can be reduced, the sliding friction can be reduced, and the coating amount of the material for forming the cutting edge can be saved. .

[0010] It is also preferable to form the irregularities 7 on the side surface of the grinding wheel by roughening the surface of the grinding wheel to be ground when the side surface 4 is ground. By adopting such a method, there is an effect that the object to be cut is restrained by the unevenness 7, and the object to be cut is prevented from slipping on the cutting edge line and escaping from between the blades during cutting.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments shown in the accompanying drawings. In the present invention, the blade base 2
Is formed in a blade shape having a cutting edge 1 and a sliding surface 3, and a cutting edge edge portion is formed on the sliding surface 3 side of the blade base 2 having the cutting edge 1 so as to go around at least the side surface 4 side of the cutting edge 1. And a coating material 5 is coated so as to become thinner as the coating layer 5 wraps around the sliding surface 3. Thereafter, the coating layer 5 on the sliding surface 3 side is polished to remove part or all of the coating layer 5 so that the cutting edge angle of the cutting edge 6 of the coating layer 5 is smaller than the cutting angle of the blade base 2. Things.

The blade base 2 as a base material is, for example, a quenching-hardening stainless steel currently used as a blade material, silver paper No. 6 (13 wt% Cr, 0.3 wt% Mo, remaining balance F).
e) and SUS304 stainless steel are used, but are not necessarily limited to these.
In coating, thermal spraying or plasma CVD
Alternatively, it is coated by electrolytic plating.

Here, in the case of coating by thermal spraying or plasma CVD, a flat surface (that is, a sliding surface 3) having an edge (that is, a cutting edge 1) is coated as shown in FIG.
As shown in (a), the coating substance (that is, the material for forming the cutting edge portion) is coated in the vicinity of the edge so as to wrap around the side surface somewhat through the edge, and the thickness decreases as the distance from the edge decreases. Using the shape of the coating layer 5 at the edge portion, the sliding surface 3
By removing an appropriate amount of the coating layer 5 of FIG.
As shown in (b), the cutting edge 6 of the coating layer 5
Is smaller than the blade edge angle of the blade base 2 (that is, the blade edge angle of the original blade shape).

The edge (that is, the cutting edge 1), the sliding surface 3
2A, the plating thickness at the edge portion becomes large as shown in FIG. 2A, so that an appropriate amount of the coating layer 5 on the sliding surface 3 is removed as described above. As shown in FIG. 2 (b), the cutting edge angle of the cutting edge 6 of the coating layer 5, which is an electrolytic plating layer, is
Is smaller than the cutting edge angle (that is, the cutting edge angle of the original blade shape).

Next, a specific embodiment of the present invention will be described.

[0016]

【Example】

(Example 1) Length 30 mm x width 30 mm x thickness 0.6 m
m, quenching-hardening stainless steel silver paper No. 6 (13 wt% C
r, 0.3 wt% Mo, balance Fe)
The surface is ground with a rotary grindstone of 500 to make the included angle 11
A blade base 2 having a 0 ° wedge-shaped blade shape was formed. Next, a 200 μm-thick film was formed by thermal spraying from the sliding surface 3 side of the blade base 2.
Stellite (Co-30Cr-12W-2.5C-
1.0 Si). Next, three types of GC polishing paper (# 500, # 1200, # 240)
The coating surface 5 of the sliding surface 3 was removed by 100 μm by polishing the sliding surface 3 by using 0) in order from the coarser side. (See FIG. 5) The first embodiment corresponds to claim 1.

(Embodiment 2) Length 30 mm × width 30 mm ×
Hardened stainless steel silver paper No. 6 (0.6mm thick) (13w
A rolled flat plate of t% Cr, 0.3 wt% Mo, and the balance Fe) was surface-ground with a BN # 500 rotary grindstone to form a wedge-shaped blade base 2 having a 90 ° edge angle. Next, by spraying, a thickness of 20 mm from the sliding surface 3 side of the blade base 2.
0 μm stellite (Co-30Cr-12W-2.5
C-1.0Si). Next, three types of GC polishing paper (# 500, # 1200, # 2
400) is used in order from the coarser one to polish the sliding surface 3, and the coating 20 is applied from the coating layer 5 on the sliding surface 3 to the blade base 2.
5 μm was removed. (See FIG. 6) The second embodiment corresponds to claim 1.

(Embodiment 3) Length 30 mm × width 30 mm ×
Hardened stainless steel silver paper No. 6 (0.6mm thick) (13w
A rolled flat plate of t% Cr, 0.3 wt% Mo, balance Fe) was surface-ground with a rotary grindstone having a BN of 500 to form a wedge-shaped blade base 2 having a blade angle of 70 °. Next, electrolytic plating was applied to the entire surface of the blade base 2 to form a coating layer 5 made of a hard Cr plating layer having a thickness of 30 μm on the surface. Next, the sliding surface 3 is polished by using three types of GC polishing paper (# 500, # 1200, # 2400) in order from the coarser one with a rotary polishing machine, and the sliding surface 3 is formed of a hard Cr plating layer. The coating layer 5 was removed by 10 μm.
(See FIG. 7) The third embodiment corresponds to claim 3.

(Embodiment 4) Length 30 mm × width 30 mm ×
Hardened stainless steel silver paper No. 6 (0.6mm thick) (13w
A rolled flat plate of t% Cr, 0.3 wt% Mo, and the balance Fe) was surface-ground with a BN # 500 rotary grindstone to form a wedge-shaped blade base 2 having a 90 ° edge angle. Next, by spraying, a thickness of 20 mm from the sliding surface 3 side of the blade base 2.
0 μm stellite (Co-30Cr-12W-2.5
C-1.0Si). Next, the coated surface that wraps around the side surface 4 is ground at 60 ° to the sliding surface 3, the coating layer 5 of the cutting edge is removed by 5 μm, and then three types of GC polishing are performed by a rotary polishing machine. Paper (♯
(500, # 1200, # 2400) was used in order from the coarser one, and the sliding surface 3 was polished to remove the coating layer 5 of the sliding surface 3 by 100 μm. (See FIG. 8) The fourth embodiment corresponds to claims 1 and 4.

(Embodiment 5) Length 30 mm × width 30 mm ×
Hardened stainless steel silver paper No. 6 (0.6mm thick) (13w
A rolled flat plate of t% Cr, 0.3 wt% Mo, balance Fe) was surface-ground with a rotary grindstone having a BN of 500 to form a wedge-shaped blade base 2 having a blade angle of 70 °. Next, the electroplating treatment is applied only to the sliding surface 3 portion up to 1 mm from the cutting edge line of the cutting edge 1 of the blade base 2 and up to 1 mm from the edge opposite to the cutting edge 1, and a hard surface having a thickness of 20 μm is formed on the surface. A coating layer 5 composed of a Cr plating layer was formed.
Next, three types of GC polishing papers (# 500, # 500)
The sliding surface 3 was polished by using (1200, 2400) in order from the coarser one to remove the coating layer 5 of the hard Cr plating layer on the sliding surface 3 by 5 μm. (See FIG. 9) The fifth embodiment corresponds to claims 1, 3, and 5.

(Embodiment 6) Length 30 mm × width 30 mm ×
Hardened stainless steel silver paper No. 6 (0.6mm thick) (13w
A rolled flat plate of t% Cr, 0.3 wt% Mo, and the balance Fe) was surface-ground with a BN # 500 rotary grindstone to form a wedge-shaped blade base 2 having a 90 ° edge angle. Next, by spraying, a thickness of 20 mm from the sliding surface 3 side of the blade base 2.
0 μm stellite (Co-30Cr-12W-2.5
C-1.0Si). Next, the surface of the coating layer 5 made of stellite coated around the side surface 4 is ground at 60 ° to the sliding surface 3 with a # 50 diamond rotating grindstone, and the coating layer 5 made of the stellite cutting edge is formed. Is removed by 5 μm to form irregularities 7 on the side surface of the blade, and further, three types of GC polishing paper (# 500, # 1200, # 2400) are used in order from the coarser one using a rotary polishing machine to form the sliding surface 3. Polishing was performed to remove the coating layer 5 on the sliding surface 3 by 100 μm. (See FIG. 10) The sixth embodiment corresponds to claims 1, 4 and 6.

(Embodiment 7) Length 30 mm × width 30 mm ×
Hardened stainless steel silver paper No. 6 (0.6mm thick) (13w
A rolled flat plate of t% Cr, 0.3 wt% Mo, balance Fe) was surface-ground with a rotary grindstone having a BN of 500 to form a wedge-shaped blade base 2 having a blade angle of 70 °. Next, diamond-like carbon having a thickness of 10 μm was coated from the sliding surface 3 side of the blade base 2 by a plasma CVD method. Next, the sliding surface 3 was polished with a rotary polishing machine using # 2400 abrasive paper to remove the coating layer 5 of diamond-like carbon on the sliding surface 3 by 0.5 μm. (See FIG. 11) The seventh embodiment corresponds to claims 1 and 2.

Comparative Example 1 Length 30 mm × width 30 mm ×
Hardened stainless steel silver paper No. 6 (0.6mm thick) (13w
A wedge-shaped blade base 2 having a 110 ° bevel angle was formed by surface-grinding a rolled flat plate of t% Cr, 0.3 wt% Mo, balance Fe) with a rotary grindstone of BNＢ500 (see FIG. 12). ). Next, the sliding surface 3 was polished using three types of GC polishing paper (# 500, # 1200, # 2400) in order from the coarser one using a rotary polishing machine.

Comparative Example 2 Length 30 mm × width 30 mm ×
Hardened stainless steel silver paper No. 6 (0.6mm thick) (13w
A rolled flat plate of t% Cr, 0.3 wt% Mo, balance Fe) was surface-ground with a rotary grindstone of BN♯500 to form a wedge-shaped blade base 2 having a 90 ° edge angle (FIG. 1).
3). Next, three types of GC polishing paper (♯
(500, # 1200, # 2400) in order from the coarser one, and the sliding surface 3 was polished.

Comparative Example 3 Length 30 mm × width 30 mm ×
Hardened stainless steel silver paper No. 6 (0.6mm thick) (13w
A wedge-shaped blade base 2 having a 70 ° bevel angle was formed by surface-grinding a rolled flat plate of t% Cr, 0.3 wt% Mo, balance Fe) with a rotary grindstone of BNＢ500 (FIG. 1).
4). Next, three types of GC polishing paper (♯
(500, # 1200, # 2400) in order from the coarser one, and the sliding surface 3 was polished.

Table 1 below shows the results of measuring the edge angle and cutting resistance of Examples 1 to 7 and Comparative Examples 1 to 3 manufactured as described above. With respect to the edge angle, the edge angle of the sample of each example and each comparative example was measured by embedding each sample in a phenol resin, polishing the sample perpendicular to the edge line, and observing the cross section with a microscope.

With respect to the cutting resistance, the cutting resistance of each of Examples and Comparative Examples was measured as an index of the sharpness of the blade, excluding burrs. Fig. 15 Cutting resistance test
As shown in (1), the wedge-shaped blade base 2 is subjected to appropriate restraint by a jig, so that the blade can move only in parallel with the vertical cross section of the 0.3 mmφ Saran yarn, and cuts the 0.3 mmφ Saran yarn. The change in resistance load is measured by a load cell, and from this value, the change in load when nothing is cut (caused by the friction between the jig and the wedge-shaped blade base 2 etc.)
The peak value of the change in load obtained by subtracting the background is used as the cutting resistance. The initial cutting resistance indicates the cutting resistance immediately after grinding, and the smaller this value, the better the sharpness. In FIG. 15, reference numeral 20 denotes a Saran yarn support, 21 denotes a load cell, 22 denotes a Saran yarn, and 23 denotes a blade holding jig.

[0028]

[Table 1]

[0029]

According to the first aspect of the present invention, as described above, the edge for forming the edge of the cutting edge is formed so as to go around at least the side surface side of the cutting edge on the sliding surface side of the blade base having the cutting edge. After coating the material and coating so that the coating layer wrapped around becomes thinner as it goes away from the sliding surface, the coating layer on the sliding surface side is removed and the cutting edge angle of the cutting edge of the coating layer is adjusted to the blade base. Since the cutting edge angle is smaller than the cutting edge angle, a cutting edge having a cutting edge angle smaller than the cutting edge angle of the original blade base is obtained, and as a result, cutting resistance when cutting an object to be cut is reduced, and the cutting load is reduced. The cutting ability can be increased.

According to the second aspect of the present invention, in addition to the effects of the first aspect of the present invention, the material for forming the edge of the cutting edge is coated by a plasma CVD method. , The thermal effect on the blade base is reduced, and warpage is hardly left due to thermal deformation and residual stress. Further, in the invention according to claim 3, the electrolytic plating method is performed so that the blade portion of the blade base having at least the blade edge having the blade edge and the sliding surface has a larger plating film thickness than other portions. The material for forming the edge of the cutting edge is coated with, and then the coating layer on the sliding surface side is removed to make the cutting edge angle of the cutting edge of the coating layer smaller than the cutting edge angle of the blade base. A cutting edge having a cutting edge angle smaller than the cutting edge angle can be manufactured with high productivity and at low cost, and a cutting edge having a cutting edge angle smaller than the cutting edge angle of the original blade base is obtained. And the cutting load can be reduced to increase the cutting ability.

According to the fourth aspect of the present invention, in addition to the effects of the first or second or third aspect of the present invention, before the sliding surface is ground and polished, Since the formed coating layer is ground to such an extent that it cannot be completely removed, the cutting edge is formed by grinding both sides by adding the side surface to the sliding surface, resulting in a sharper edge.

According to the fifth aspect of the invention, in addition to the effects of the first to fourth aspects, the coating is applied only to the vicinity of the edge of the blade base. In addition, the contact area of the sliding surface can be reduced, so that the sliding friction can be reduced and the coating material can be saved. According to the invention of claim 6, in addition to the effect of the invention of claim 4, in addition to the effect of the invention of claim 4, the surface of the grinding wheel is roughened at the time of side grinding to form irregularities on the blade side. Therefore, at the same time as forming unevenness on the blade side surface, the cutting edge line becomes a broken line field, which has the effect of constraining the cut object, preventing the cutting object from sliding on the cutting edge line during cutting and escaping from between the blades, cutting efficiency It can be improved.

[Brief description of the drawings]

FIG. 1 shows a manufacturing sequence of an embodiment of the present invention, wherein (a)
FIG. 4 is an explanatory view showing a state before the impulse surface is ground at the stage when the coating layer is formed, and FIG. 4B is an explanatory view showing a state after the coating layer on the sliding surface is ground.

FIG. 2 shows a manufacturing sequence of another embodiment of the present invention,
(A) is an explanatory view showing a state before the impulse surface is ground at the stage when the coating layer is formed by the electrolytic plating method,
(B) is an explanatory view showing a state after the coating layer on the sliding surface has been ground.

FIG. 3 is a perspective view of an example of a blade.

FIG. 4 is a drawing showing a blade base, wherein (a) is a front view,
(B) is a perspective view, and (c) is a perspective view seen from below.

FIG. 5 is an explanatory diagram of one embodiment of the present invention.

FIG. 6 is an explanatory diagram of another embodiment of the above.

FIG. 7 is an explanatory view of still another embodiment of the above.

FIG. 8 is an explanatory view of still another embodiment of the above.

FIG. 9 is an explanatory view of still another embodiment of the above.

FIG. 10 is an explanatory diagram of still another embodiment of the above.

FIG. 11 is an explanatory view of still another embodiment of the above.

FIG. 12 is an explanatory diagram of a comparative example.

FIG. 13 is an explanatory diagram of another comparative example.

FIG. 14 is an explanatory diagram of still another comparative example.

FIG. 15 is a schematic explanatory view of a cutting resistance measuring device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Blade edge 2 Blade base 3 Sliding surface 4 Side surface 5 Coating layer 6 Blade edge 7 Irregularity

Claims (6)

[Claims] 1. A material for forming a blade edge portion is coated on a sliding surface side of a blade base having a blade edge so as to wrap around at least a side surface of the blade edge, and as the wrapped coating layer becomes more distant from the sliding surface. A method for producing a cutting tool, comprising: coating a coating layer so as to be thin; and removing a coating layer on a sliding surface side so that a cutting edge angle of a cutting edge portion of the coating layer is smaller than a cutting edge angle of a blade base. 2. A material for forming a blade edge portion is plasma C.
The method according to claim 1, wherein the coating is performed by a VD method. 3. A material for forming a blade edge portion by electrolytic plating so that a blade portion including at least a blade portion of a blade base having a blade edge and a sliding surface has a plating film thickness larger than other portions. And then removing the coating layer on the sliding surface side so that the blade edge angle of the blade edge portion of the coating layer is smaller than the blade edge angle of the blade base. 4. A cutting tool according to claim 1, wherein before the grinding and polishing of the sliding surface, the coating layer formed on the side surface is ground to such an extent that the coating layer is not completely removed. Manufacturing method. 5. The method for manufacturing a blade according to claim 1, wherein the coating is applied only to the vicinity of the cutting edge of the blade base. 6. The method for manufacturing a blade according to claim 4, wherein irregularities are formed on the side surface of the grinding wheel by roughening the surface of the grinding wheel to be ground during the side surface grinding.