JP2001204639A - Cutter for kitchen utensil, hardening method for the cutter, and rotary cooking implement provided with the cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten an aging treatment time in a cutter of a rotary cooling implament making use of a precipitation-hardened material and enhance performance as a cutter or a product. SOLUTION: The outer peripheral part 11 of the upper part 6 of a cutter and the lower part 7 of the cutter is rolled and subjected to an aging treatment to introduce dislocation caused by cold rolling. When aging treatment is applied thereafter, as a differential precipitation arises at the outer peripheral part 11 where a large activating energy is given, the aging treatment time is shortened. In this time, since the aging treatment time for the edge 12 and the central part 13 is short, the precipitation is not promoted much and malleability or toughness is not deteriorated and hence, the durability of the upper part 6 of the cutter and the lower part 7 of the cutter can be kept undetreiorative too.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutter for a rotary cooker such as a mixer juicer and a speed cutter used for general household and business use.

[0002]

2. Description of the Related Art A conventional mixer cutter is used as an example.
The configuration will be described with reference to FIGS. 1 is the body, 2
Is a container for storing food for cooking vegetables, fruits and the like, and is composed of a cup 3 and a cup table 4 on which the cup 3 is removably mounted. A finished cutter 5 is attached to the cup table 4. The completed cutter 5 is composed of the upper cutter 6, the lower cutter 7, and the main shaft 8, and the upper cutter 6,
A cutting edge 9 is formed under the cutter 7 by polishing.
The upper cutter 6 and the lower cutter 7 are bent into a predetermined shape. The completed cutter 5 is rotated by power transmission from the motor 10 and is configured to be able to cut food such as vegetables and fruits.

[0003] Since dynamic stress is repeatedly applied to the cutter in a mixer, a similar cutter material for the mixer is made of SUS301 or SUS304 having hardness such as strength, ductility, toughness, and wear resistance, and deformation resistance. It is common to use rolled material as it is. In order to further improve the deformation resistance, the outer peripheral portion 11 of the upper cutter 6 and the lower cutter 7 is cold-rolled and work-hardened to form the outer peripheral portion 1.
1 can be improved to make it difficult for the cutter as a whole to be permanently deformed easily. In this case, if the entire cutter is work hardened more than the temper rolling, the ductility and toughness of the entire cutter decrease, and as a result, the bending workability deteriorates,
Further, the durability of the cutter against breaking may be reduced.

[0004] Such SUS301 or SUS30
As a means for substituting the work hardening type material represented by No. 4 or improving the performance further, there is a technique using a precipitation hardening type material.

[0005]

However, simply using a precipitation hardening type material as a cutter material requires a long aging treatment time for precipitation hardening. That is, although it varies depending on the material and the processing temperature, it generally takes about 1 hour to 10 hours, and the production efficiency is poor. When it is desired to improve the proof stress of the outer peripheral portion 11 and to further improve the deformation resistance in the same manner as the means by work hardening, the aging treatment not only causes the outer peripheral portion 11 but also the blade portion 12 and the central portion 13 to have the same proof stress. Rise,
Since the ductility and toughness of the cutter as a whole decrease, the durability of the cutter against breaking may also decrease.

When it is desired to improve the deformation resistance by cold rolling a part of the cutter, if the blade portion 12 including the cutting edge 9 is subjected to cold rolling, the wear resistance of the cutting edge 9 is improved. However, when the edge 9 is cold-polished, the edge 9 is very hard, so that the polishing becomes difficult.

[0007] Therefore, the present invention improves the production efficiency, which is the above-mentioned problem, improves the durability against breakage of the cutter, and improves the efficiency of polishing the cutting edge of the cutter, and a rotary cooker equipped with the cutter. The purpose is to provide.

[0008]

In order to solve the above-mentioned problems, the present invention uses a precipitation hardening type stainless steel or a titanium alloy, and in any case, has an outer peripheral portion into which dislocations are introduced by rolling. However, in the outer peripheral portion and the other portion of the cutter, a strong pair due to a different precipitation couple due to aging treatment (heating treatment) is different.

[0009] The hardening method is to apply rolling pressure to the outer peripheral portion of the cutter, and then to subject the entire cutter to aging treatment.

That is, by the above-mentioned means, dislocations due to rolling are introduced into the outer peripheral portion of the cutter, and when the aging treatment is performed thereafter, preferential precipitation occurs in the outer peripheral portion to which a large activation energy is given, so that the aging treatment is completed in a short time. High production efficiency. At that time, since the aging treatment time is short at the blade portion and the central portion of the cutter, the precipitation has not progressed much, and the ductility and toughness have not been reduced, so that the durability of the cutter as a whole to be broken can be maintained. . Also, it is possible to reduce the residual stress due to the bending at the same time as the aging treatment, and it is possible to further improve the durability against the breakage of the cutter.

Therefore, it is possible to use a precipitation hardening type material, and by appropriately combining the degree of work by rolling with the aging temperature and the aging time, the hardness such as strength, ductility, toughness, and abrasion resistance, and the deformation resistance are improved. Of the conventional cutter material SU
It is possible to further improve the performance as a cutter by improving in a better balance than the temper rolled materials of S301 and SUS304.

Further, the cutter is made of a titanium alloy, and
After the blade of the cutter is rolled and the blade of the cutter is polished into a corrugated shape and then subjected to aging treatment, the hardness of the blade including the rolled blade is hardened as the work hardening material such as SUS301. However, polishing is not difficult, and furthermore, it can be cured by subjecting it to aging treatment, and the wear resistance of the cutting edge can be improved.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the invention according to claims 1 and 2 of the present invention, the material of the cutter is a precipitation hardening type stainless steel, and the invention according to claims 5 and 6 is a titanium alloy. Is subjected to rolling and aging treatment. By making this configuration an embodiment,
Dislocations due to rolling are introduced into the outer peripheral portion, and when aging treatment is performed thereafter, preferential precipitation occurs in the outer peripheral portion to which a large activation energy is given, so that the aging treatment is completed in a short time. At this time, since the aging treatment time is short in the blade portion and the central portion of the cutter, precipitation does not proceed so much, and ductility and toughness do not decrease, so that the durability of the cutter as a whole against breaking can be kept. Also, it is possible to reduce the residual stress due to the bending at the same time as the aging treatment, and it is possible to further improve the durability against the breakage of the cutter.

According to a seventh aspect of the present invention, the cutter is made of a titanium alloy, the blade of the cutter is rolled, and the edge of the cutter is polished into a corrugated shape, and then subjected to an aging treatment. By adopting this configuration as an embodiment, the hardness of the blade portion including the blade edge after rolling is not as hard as that of a work hardening type material such as SUS301, polishing is not difficult, and furthermore, aging treatment is performed thereafter. And the wear resistance of the cutting edge can be improved.

To facilitate understanding of embodiments of the present invention,
An explanation will be given below including definitions of terms in the present invention.

In the case of precipitation hardening type stainless steel, for example,
In the case of SUS630, which is a representative of martensite,
An austenite single phase is formed by a solution treatment at 1020 to 1060 ° C. for 0.5 hour, and a martensite structure is formed by quenching therefrom. Thereafter, aging treatment (480 to 620)
Heat treatment at 0.5C for 0.5-4 hours. ) To precipitate and strengthen a copper-rich tcc phase (face-centered cubic lattice).

Further, in the case of a titanium alloy, for example, in the case of a β-type titanium alloy, a β-phase (highly stable phase, bcc phase = body-centered cubic lattice) is formed by a solution treatment in a β-phase region, and quenching is performed from there. The β phase is allowed to remain, and then heated or aged at a slightly higher temperature than that at which the ω phase (embrittlement phase) is generated, and fine α
A phase (low-temperature stable phase, hcp phase = dense cubic lattice) is precipitated and strengthened at grain boundaries and grains.

What precipitates from the precipitation hardening type stainless steel is a fine precipitate based on a precipitation hardening element such as Al, Ti, Nb, Cu, Be, or P. In the case of a titanium alloy, a fine α Phase.

[0019]

(Embodiment 1) An embodiment of the present invention will be described below with reference to FIGS. 1 is a main body, 2 is a container for storing vegetables, fruits and the like, and the container 2 is composed of a cup 3 and a cup table 4 on which the cup 3 is removably mounted. A finished cutter 5 is attached to the cup table 4, and the finished cutter 5 includes a cutter upper 6, a cutter lower 7, and a main shaft 8. The upper cutter 6 and the lower cutter 7 include an outer peripheral portion 11, a blade portion 12, and a central portion 13, and are bent into a predetermined shape. The blade portion 9 is formed into a waveform in the blade portion 12 by polishing.
The completed cutter 5 is rotated by power transmission from the motor 10, and has a mechanism capable of cutting vegetables, fruits and the like.
The configuration up to this point is the same as the configuration of the general mixer shown in FIG.

The basic processing steps for the upper cutter 6 and the lower cutter 7 are as shown in FIG. The cutter material is precipitation hardening stainless steel, which is strengthened by aging treatment in the final process. By the cold rolling to the outer peripheral portion 11, dislocation for terminating the aging treatment in a short time is introduced, but it is not necessarily a so-called blanking pre-process for forming the appearance and the mounting hole as a cutter, Not only cold rolling but also other processing methods such as warm rolling, forging (cold, warm), and shot peening that can cause preferential precipitation may be used.

By the above-described means, dislocations due to cold rolling are introduced into the outer peripheral portion 11, and when aging treatment is performed, preferential precipitation occurs in the outer peripheral portion 11 to which a large activation energy is given. finish. At this time, since the aging treatment time of the blade portion 12 and the central portion 13 is short, the precipitation has not progressed much, and the ductility and the toughness have not been reduced. You don't have to. Conversely, the aging time is too short,
When the aging treatment of the blade portion 12 and the central portion 13 is insufficient, the working degree of the cold rolling applied to the outer peripheral portion 11 is reduced, the aging treatment time is extended, and the blade portion 12 and the central portion 13 are strengthened.
In this case, the reinforcement by the aging process may be further advanced. If the aging treatment time becomes longer by doing so, if the blade portion 12 and the central portion 13 are subjected to cold rolling with a moderate working degree smaller than that of the outer peripheral portion 11, the blade portion 12 and the central portion 13 are also provided. Appropriate activation energy is given, and the aging time can be shortened. It is also possible to reduce residual stress due to bending at the same time as aging treatment,
The durability against breaking of the upper cutter 6 and the lower cutter 7 can be further improved.

Therefore, it is possible to use a precipitation hardening type material, and the strength, ductility, toughness, abrasion resistance and deformation resistance can be improved by appropriately combining the degree of cold rolling and the aging temperature and aging time. It is possible to further improve the performance as a cutter by improving in a well-balanced manner more than conventional cutter materials (tempered rolled materials of SUS301 and SUS304). In addition, the temperature of the aging process in Example 1, time,
To illustrate the tissue change, the temperature is 480-620.
℃, time is a heat treatment for 10 minutes to 4 hours,
Fine precipitates based on precipitation hardening elements such as 1, Ti, Nb, Cu, Be, and P are deposited.

(Embodiment 2) Hereinafter, Embodiment 2 of the present invention will be described. The configuration of the present invention is the same as that of FIGS. 1 to 3 except that the material of the upper cutter 6 and the lower cutter 7 is a titanium alloy. The basic processing steps for the upper cutter 6 and the lower cutter 7 are the same as those in FIG. The cutter material is excellent in workability among titanium alloys, and β-type, which can obtain high strength by aging treatment, is the most powerful, and Ti-15V-3Cr-3S
n-3Al, Ti-15Mo-5Zr-3Al, Ti-
There are 11.5Mo-6Zr-4.5Sn and various other types. In particular, Ti-15V-3Cr-3Sn-3Al is said to be the most excellent β-type alloy at present.
Next, α + β type is influential, and Ti-6Al-4V and Ti-10, which are the most well-known and versatile titanium alloys
V-2Fe-3Al and the like correspond to this, and there are various other types. That is, in the β type, in addition to the above, Ti-1
5Mo-5Zr, Ti-3Al-8V-6Cr-4Mo
-4Zr, Ti-8Mo-8V-2Fe-3Al, Ti
-13V-11Cr-3Al, etc., and in the α + β type, in addition to the above, Ti-6Al-6V-2Sn, Ti-7Al
-4Mo, Ti-6Al-2Sn-4Zr-6Mo, T
i-7Al-2Sn-2Zr-2Mo-2Cr-0.2
5Si, Ti-2.25Al-11Sn-4Mo-0.
2Si, Ti-5Al-2Zr-2Sn-4Mo-4C
r, Ti-6Al-5Zn-4Mo-1Cu-0.2S
i, Ti-5Al-2Cu-1Fe and the like. And
As in the case of the first embodiment, the aging treatment in the final step is used to enhance the strength.

By the above means, the same effects as in the first embodiment can be obtained. Further, the following effects can be obtained by using a titanium alloy as the cutter material. First, since the specific gravity is about 60% of that of stainless steel, cutting performance can be improved by increasing the number of revolutions by reducing the weight. Next, permanent deformation hardly occurs due to high proof stress, and the thickness can be reduced accordingly, and the cutting performance can be improved with an increase in the number of rotations and low cutting resistance. Further, excellent corrosion resistance is obtained, which is superior to stainless steel. In addition, most products of this type use oil-less bearings, and in such a case, extending the life of the bearing is a problem. Compared to stainless steel, Young's modulus is about 60
%, So that when the load of hard vegetables or the like is applied to the upper cutter 6 and lower cutter 7, the cutter itself easily bends and absorbs the dynamic force due to the load, so the surface pressure applied to the bearing is reduced, and the bearing pressure is reduced. There is also an effect that the life is improved.
Therefore, it is possible to further improve the performance as a cutter or a product. In Example 2, the temperature of the aging treatment is, for example, 420 to 700 ° C., and the time is 10 minutes to
At 24:00, a fine α phase (low-temperature stable phase, hcp phase = dense cubic lattice) precipitates at the grain boundaries and in the grains.

(Embodiment 3) Hereinafter, Embodiment 3 of the present invention will be described. The present invention has the same basic structure as that shown in FIG. 1, and performs cold rolling on the blade portion 14 as shown in FIGS.
And subjected to aging treatment. The basic processing steps are as shown in FIG. First, the blade portion 14 is subjected to cold rolling. Subsequently, blanking for forming a cutter is performed. Subsequently, the blade portion 14 that has been subjected to the cold rolling is polished in a corrugated manner to form a blade edge 15. Next, bending processing is performed to a predetermined shape, and finally, aging treatment is performed. If necessary, descaling by pickling or shot blasting, or surface treatment such as PVD coating is performed. The cutter material is a titanium alloy as shown in Example 2.

By the above means, the hardness of the blade portion 14 including the blade edge 16 after rolling is not as hard as that of a work hardening type material such as SUS301, and polishing is not difficult. Further, unlike the first embodiment, preferential precipitation is caused not on the outer peripheral portion 16 but on the blade portion 14 and the side of the blade portion 14 is hardened.
In addition to the effect similar to that of the second embodiment, the effect of improving the wear resistance of the blade portion 14 that actually performs cutting is also obtained.

The shape of the blade edge 15 may be a straight blade instead of a waveform. Also, the cutter material may be precipitation hardening stainless steel instead of titanium alloy, but in this case, if work hardening by rolling is large, polishing becomes difficult, so select a material having a small work hardening capacity that does not make polishing difficult. There is a need to.

[0028]

According to the first and second aspects of the present invention, by performing rolling and aging on the outer peripheral portion of the cutter, preferential precipitation occurs in the outer peripheral portion, so that the aging process is completed in a short time. However, at this time, since the aging treatment time is short in the blade portion and the central portion, the precipitation has not progressed much, and the ductility and the toughness do not decrease, so that the durability of the cutter as a whole against breaking can be maintained. It is also possible to reduce residual stress due to bending at the same time as aging treatment.
The durability against breakage of the cutter can be further improved.

Therefore, the precipitation hardening type material can be used, and the strength, ductility, toughness, hardness (abrasion resistance), Deformation resistance is SUS301 or SUS304
If it is improved in a better balance than the temper rolled material, it is possible to further improve the performance as a cutter.

According to the fifth and sixth aspects of the present invention, in addition to the effects of the first and second aspects of the present invention, the cutter is made of a titanium alloy, so that the number of revolutions can be increased by reducing the weight. The performance can be improved. In addition, permanent deformation is difficult due to high proof stress, and the thickness can be reduced accordingly, and the cutting performance can be improved with an increase in rotation speed and low cutting resistance. Furthermore, corrosion resistance superior to stainless steel is obtained. In addition, the Young's modulus is about 60% lower than that of stainless steel, so when a load such as hard vegetables is applied to the cutter, the cutter itself is easily bent and absorbs the dynamic force due to the load, so that it is applied to the bearing. The contact pressure is reduced, and the life of the bearing is improved. Therefore, it is possible to further improve the performance as a cutter or a rotary cooker product.

According to the seventh aspect of the present invention, the cutter is made of a titanium alloy, and the blade of the cutter is rolled.
After grinding the cutting edge of the cutter into a waveform, by performing aging treatment, the hardness of the blade portion including the cutting edge after rolling is SUS30.
The hardening is not so hard as the work hardening type material like No. 1 and the polishing is not difficult. Further, the hardening can be performed by performing an aging treatment, and the wear resistance of the cutting edge can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a general mixer.

FIG. 2 (a) is a front view on a cutter in embodiments 1 and 2 of the present invention. (B) is a side view. (C) is an enlarged cross-sectional view taken along line AA in (a). BB line enlarged sectional view

FIG. 3 (a) is a front view under the cutter. (B) is a side view. (C) is an enlarged sectional view taken along line AA in (a). (D) is an enlarged sectional view taken along line BB in (a).

FIG. 4 is a basic processing step diagram above and below the cutter in Examples 1 and 2 of the present invention.

5 (a) is a front view on a cutter according to a third embodiment of the present invention. FIG. 5 (b) is a side view. FIG. 5 (c) is an enlarged cross-sectional view taken along the line AA in FIG. B line enlarged sectional view

6 (a) is a front view below the cutter, (b) is a side view, (c) is an enlarged sectional view taken along line AA in (a), and (d) is an enlarged sectional view taken along line BB in (a).

FIG. 7 is a diagram of a basic machining process above and below the cutter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Container 3 Cup 4 Cup stand 5 Finished cutter 6 Upper cutter 7 Lower cutter 8 Main shaft 9 Cutting edge 10 Motor 11 Outer peripheral part 12 Cutting part 13 Central part 14 Cutting part 15 Cutting part 16 Outer part

Claims (9)

[Claims] 1. A cutter of a cooking device for cutting food, wherein the cutter is made of precipitation hardening stainless steel, has an outer peripheral portion into which dislocations are introduced by rolling, and aging occurs between the outer peripheral portion and other portions of the cutter. A cooker cutter characterized in that a strong pair is different due to a different degree of precipitation of a precipitate based on a precipitation hardening element due to the treatment. 2. A cutter made of precipitation hardening type stainless steel, which has a rolling step for applying an outer peripheral portion of a cutter for cutting food, and the cutter after the rolling step is heated in an aging treatment step, Characterized in that the copper-rich face-centered cubic lattice precipitation pairs are different between the outer peripheral portion and the other portion, and the strong pair is different between the outer peripheral portion and the other portion of the cutter. Curing treatment method. 3. A rotary cooker comprising the cutter of the cooker according to claim 1. 4. A rotary cooker provided with a cutter of a cooker to which the curing treatment method according to claim 2 has been applied. 5. A cutter of a cooker for cutting food, wherein the cutter is made of a titanium alloy, has an outer peripheral portion into which dislocations are introduced by rolling, and the outer peripheral portion and the other portion of the cutter have grain boundaries formed by aging treatment. A cooker cutter characterized in that a strong pair is different due to a different precipitation pair of an α phase precipitated in grains. 6. A rolling step for applying an outer peripheral portion of a cutter made of a titanium alloy for cutting food, wherein the cutter having completed the rolling step is heated in an aging treatment step, and the outer peripheral portion of the cutter is heated. The pairing of the α phase precipitated in the grain boundaries and in the grains is different from the other parts, and the strong pair is made different between the outer peripheral part of the cutter and the other parts. Curing method. 7. After rolling a blade portion of a cutter made of a titanium alloy for cutting food, the blade edge of the cutter is polished into a corrugated shape, and then the aging process is performed on the cutter to reduce grain boundaries and grains. A method for curing a cooking appliance, comprising precipitating an α phase. 8. A rotary cooker comprising the cutter of the cooker according to claim 5. 9. A rotary cooker comprising a cutter of a cooker which has been subjected to the curing treatment method according to claim 6 or 7.