JP3253902B2 - Lifesaving cutting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a life-saving rescue cutter for cutting a collapsed house or a car and rescuing a person trapped in the car.

[0002]

2. Description of the Related Art A life-saving rescue cutter (also referred to as a rescue cutter) is used for rescuing residents trapped in a house by cutting components such as pillars, beams, and reinforcing bars of a house that has collapsed due to an earthquake or the like. ) Is used. A life-saving rescuer is also used when a car accident is cut to rescue a person trapped in the car by cutting the body of the car. This life-saving rescue machine is deployed in fire departments and SDF rescue units.

FIG. 1 is a perspective view of a lifesaving cutting machine, and FIG. 2 is a partial cross-sectional view thereof. The left side in FIG. 2 is the front side of the lifesaving cutting machine, and the right side in FIG. 2 is the rear side of the lifesaving cutting machine. The upper side in FIG. 2 is the right side of the lifesaving cutting machine, and the lower side in FIG. 2 is the left side of the lifesaving cutting machine. 1 and 2 relate to the present invention, but the shape and mechanism of the conventional life-saving rescuing machine are almost the same as those of the present invention. A conventional lifesaving cutting machine will be described with reference to FIGS.

[0004] This life-saving rescue machine is, in order from the rear side,
A cylinder unit 1, a frame unit 3, and a blade unit 5 are provided. A grip handle 7 is attached to the cylinder 1, and a handle 9 is attached to the frame 3.

The cylinder section 1 has a cylinder 11 and a head cover 15 attached to the rear end of the cylinder 11 with bolts 13. A hydraulic path 17 is provided in the cylinder 11. A piston 19 and a piston rod 21 connected to the piston 19 are provided in the cylinder 11.

[0006] In front of the cylinder part 1, a frame part 3 is provided.
Is provided. The rear end of the frame portion 3 has a cylindrical shape, whereas the front end has a shape in which both left and right walls of the cylinder are cut out. A bolt hole 23 as a shaft support hole is formed near the front end of the frame portion 3. A clevis 25 and a pair of left and right link plates 27 are provided inside the frame portion 3.
a and 27b are provided. The clevis 25 is a piston rod 21 projecting from the cylinder 1 to the frame 3.
A clevis hole 29 is formed near the front end of the clevis 25. The link plates 27a and 27b have an oblong planar shape. Each of the link plates 27a, 27b is provided with front end holes 31a, 31b near the front end thereof, and the rear end hole 3 near the rear end.
3a and 33b are drilled. The clevis pin 35 passes through the rear end hole 33a of the left link plate 27a, the rear end hole 33b of the right link plate 27b, and the clevis hole 29.
7b is rotatably supported by the clevis 25.

[0007] The blade portion 5 comprises a left upper blade 37a and a right lower blade 37b. Upper blade 37a and lower blade 37b
Has cutting edge portions 39a and 39b that come into contact with the cutting target when cutting the cutting target. Upper blade 37a
A fulcrum hole 41 is provided near the center of each of the lower blade 37b.
a and 41b are drilled, and link holes 43a and 43b are drilled near the respective rear ends. The upper blade 37a and the lower blade 37b are respectively provided with fulcrum holes 41a,
The blade portion 45 is rotatably supported by the frame portion 3 by a blade bolt 45 penetrating through the bolt hole 1b and the bolt hole 23 of the frame portion 3. Link pin 47 penetrating through link hole 43a of upper blade 37a and front end hole 31a of left link plate 27a.
The upper blade 37a and the left link plate 27a are rotatably supported by a. Link hole 4 of lower blade 37b
The lower blade 37b and the right link plate 27b are rotatably supported by a link pin 47b penetrating the front end hole 31b of the right link plate 27b.

When cutting an object to be cut by using this life-saving rescue machine, a cutting operator first grips the handle 9 and the grip handle 7 by hand and holds the upper blade 37a and the lower blade 37.
b and the object to be cut. Then, the oil in the hydraulic path 17 is caused to flow by means not shown, and the rear end of the piston 19 is pushed by the hydraulic pressure. Then piston 19
Moves forward, and the piston rod 21 and the clevis 25 connected to the piston 19 also move forward. As the clevis 25 moves, the front end of the left link plate 27a is pushed to the left, and the front end of the right link plate 27b is pushed to the right. As a result, the rear end of the upper blade 37a is pushed to the left and the rear end of the lower blade 37b is pushed to the right. The upper blade 37a and the lower blade 37b are provided with a blade bolt 45.
The blade 39 is rotated about the blade bolt 45 as a fulcrum.
The cutting edge 39b of b moves to the left, and the distance between the cutting edges 39a and 39b is reduced. Then, the object to be cut is cut.

When the cutting is completed, the oil in the hydraulic path 17 is caused to flow by means not shown, and the front end of the piston 19 is pushed by the hydraulic pressure. Then, the piston 19 moves rearward, and the piston rod 21 and the clevis 25 connected to the piston 19 also move rearward. As the clevis 25 moves, the front end of the left link plate 27a moves to the right, and the front end of the right link plate 27b moves to the left. As a result, the rear end of the upper blade 37a moves to the right, and the rear end of the lower blade 37b moves to the left. Since the upper blade 37a and the lower blade 37b are pivotally supported by the blade bolt 45, the upper blade 37a and the lower blade 37b rotate with the blade bolt 45 as a fulcrum.
The cutting edge 39a of the lower blade 37b is moved to the left.
b moves to the right side, and the both edge portions 39a, 39b
Is increased. Thus, the next cutting operation of the cutting object is started.

As the material of the conventional life-saving machine, iron and steel materials such as carbon steel, alloy steel, high-speed tool steel and sintered high-speed steel are mainly used. Since these steel materials are excellent in strength and wear resistance, they are suitable for a life-saving rescuer having many frictional parts and sliding parts. However, since the specific strength of the steel material is not so high, if a life-saving rescue machine is manufactured using this steel material, the total weight of the life-saving resection machine becomes heavy. For example, if the maximum load capacity is 20
For a ton steel life-saving rescue machine, the total weight is 1
It can reach 3 to 15 kilograms. Such a heavy life-saving rescuing machine is difficult to handle with human power, and if a cutting operation is performed using this, the burden on the cutting operator increases, which may hinder the cutting operation. In addition, a cutting operation using a heavy-weight life-saving cutting machine at a site with a poor scaffold may pose a danger to workers such as rescue workers.

[0011]

The members of the life-saving rescuing machine such as the blade 5, the frame 3, the cylinder 11, etc.
If it is made of a metal material having an excellent specific strength, such as an aluminum alloy or a titanium alloy, the total weight of the life-saving rescuer can be reduced.

However, when the blade 5 is made of an aluminum alloy or a titanium alloy, the blade 39 of the blade 5
Reference numerals a and 39b denote portions that rub against the object to be cut at the time of cutting, and since the aluminum alloy or the titanium alloy is inferior in wear resistance, there is a problem that the cutting edge portions 39a and 39b are worn.

When the frame portion 3 is made of an aluminum alloy or a titanium alloy, the vicinity of the bolt hole 23 of the frame portion 3 is a place where stress is concentrated, and the blade portion bolt 45 and the blade portion bolt 45 are fitted. Since it is a portion that slides with a nut (not shown) to be combined, there is a problem that the vicinity of the bolt hole 23 is deformed or worn by an aluminum alloy or a titanium alloy having poor wear resistance and hardness. .

Further, when the cylinder 11 is made of an aluminum alloy or a titanium alloy, the inner peripheral surface of the cylinder 11 is a portion where the piston 19 slides, and the aluminum alloy or the titanium alloy has poor wear resistance.
There is a problem that the inner peripheral surface of the cylinder 11 is worn.

The present invention has been made in view of these problems, and a life-saving rescuing machine with a reduced total weight without impairing the wear resistance of the cutting edges 39a, 39b, the frame 3, and the cylinder 11. Its purpose is to provide.

[0016]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a personal rescue system in which a cutting edge made of a steel material is joined to a base metal made of a titanium alloy. It is a cutting machine for rescuing a human life, wherein a solution treatment of a base metal and a quenching of a cutting edge are performed simultaneously with the brazing when joining the base metal and the blade tip by brazing (claim) Item 1).

According to this invention, since the base metal is made of a titanium alloy having excellent specific strength, the weight of the entire blade portion can be reduced. Moreover, since the cutting edge portion is made of a steel material having excellent wear resistance and hardness, the cutting edge portion is less likely to be worn even by friction with the object to be cut. Therefore, it is possible to achieve both reduction in the weight of the blade portion and improvement in the wear resistance. By employing brazing as a joining method between the base metal and the cutting edge, it is possible to reliably perform joining between different metals between the steel material and the titanium alloy, and to increase the joining strength. In addition, by selecting a brazing material having an appropriate brazing temperature and performing the solution treatment of the base metal and the quenching of the cutting edge simultaneously with the joining by brazing, the manufacturing process of the blade is simplified. Energy savings.

[0018]

Another invention made in order to solve the above-mentioned problem is provided with a piston and a cylinder enclosing the piston, wherein a cylinder portion for reciprocating the piston by hydraulic pressure, and A lifesaving rescue cutting machine having a blade portion that is connected and opens and closes with the reciprocating motion of the piston, wherein the blade edge portion made of a steel material is joined to a base metal made of a titanium alloy. When the base metal and the cutting edge are joined by brazing, a solution treatment of the base metal and quenching of the cutting edge are performed simultaneously with the brazing, and the cylinder is mainly made of an aluminum alloy or a titanium alloy. Material
A life-saving rescue cutter characterized in that the inner peripheral surface of the cylinder is subjected to a surface treatment for improving abrasion resistance (claim 2).

According to the present invention, in addition to the effect of reducing the weight of the blade portion and improving the wear resistance, the manufacturing process of the blade portion can be simplified and energy can be saved. Since it is made of an aluminum alloy or a titanium alloy having excellent specific strength, the weight of the entire cylinder can be reduced. In addition, since the inner peripheral surface of the cylinder is subjected to a surface treatment for improving wear resistance, even if the piston slides on the inner peripheral surface of the cylinder, the inner peripheral surface is less likely to be worn. Therefore, it is possible to achieve both reduction in weight of the cylinder and improvement in wear resistance.
As the surface treatment of the inner peripheral surface, nickel-
Phosphorus composite plating is preferred (claim 3).

Still another invention for solving the above-mentioned problems is a frame having a shaft support hole, a blade portion rotatably supported by the shaft support hole. A life-saving rescue cutting machine comprising: a frame part mainly made of an aluminum alloy or a titanium alloy; and a surface hardening treatment performed near a shaft supporting hole. It is a rescue cutting machine.

According to the present invention, since the frame portion is made of an aluminum alloy or a titanium alloy having excellent specific strength, the weight of the entire frame portion can be reduced. In addition, since the surface hardening treatment is performed in the vicinity of the shaft support hole, deformation and wear are less likely to occur in the vicinity of the shaft support hole. Therefore, it is possible to achieve both reduction in the weight of the frame portion and improvement in the wear resistance. As a suitable surface hardening treatment, a plasma powder surfacing treatment capable of achieving a high hardness of the treated part can be mentioned.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings.

FIG. 1 is a perspective view of a lifesaving cutting machine according to an embodiment of the present invention, and FIG. 2 is a partial cross-sectional view thereof. The shape and dimensions of each member constituting this life-saving rescuing machine are substantially the same as those of a conventional life-saving rescuing machine made of steel.

FIG. 3A is a plan view of the lower blade 37b, and FIG. 3B is a cross-sectional view taken along line AA of FIG. 3A. The lower blade 37b includes a base 49 and a cutting edge 39b joined to an end of the base 49. Although only the lower blade 37b of the blade portion 5 is shown in FIG. 3, the upper blade 37a has a shape obtained by inverting the lower blade 37b.

The base metal 49 is made of a titanium alloy. Since the titanium alloy has the highest specific strength among practical metals, the weight of the blade portion 5 can be reduced by using this titanium alloy. As the titanium alloy to be used, for example, α +
β-type titanium alloys, β-type titanium alloys and the like can be mentioned. Among them, an α + β type titanium alloy which is excellent in workability, capable of solution treatment, and excellent in balance of strength, toughness and the like is preferable.
Preferred α + β-type titanium alloys include Ti-6Al-
4V alloy.

The cutting edge 39b is made of a steel material. Generally, steel materials have higher hardness and higher wear resistance than titanium alloys. By using this steel material, it is possible to suppress the wear of the cutting edge portion 39b even when the cutting edge portion 39b rubs against the object to be cut during cutting. Examples of the steel material used include carbon steel, alloy tool steel, high-speed tool steel, sintered high-speed steel, and the like. Among them, alloy tool steel which is excellent in hardenability and excellent in balance between strength and toughness is preferable. Preferred alloy tool steels include SKS3 whose quenching temperature is close to the solution treatment temperature of the titanium alloy used for the base metal 49.

The base 49 and the cutting edge 39b are joined by brazing. By brazing, the dissimilar metal joining between the titanium alloy and the steel material is reliably performed. Examples of the brazing material used include aluminum alloy brazing,
Hard brazing such as phosphor copper brazing, silver brazing or gold brazing can be used.
Among these hard solders, a silver solder whose brazing temperature is close to the solution treatment temperature of the titanium alloy and the quenching temperature of the steel material is preferably used. The base 49 and the cutting edge 39b may be joined by means other than brazing, such as screwing.

FIG. 4 (a) is a plan view showing the vicinity of the front end of the frame portion 3 of the lifesaving cutting machine according to one embodiment of the present invention, and FIG. 4 (b) is a plan view of FIG. ) Is a cross-sectional view along the line BB, and FIG.
4B is an enlarged view of a portion C surrounded by a dotted circle, and FIG. 4D is an enlarged view of D surrounded by a dotted circle in FIG.
An enlarged view of the section is shown. A portion near the front end of the frame portion 3 has a shape in which both left and right walls of the cylinder are cut out, and is divided into an upper plate 51 and a lower plate 53. The bolt holes 23 are formed in the upper plate 51 and the lower plate 53.

The frame 3 is made of an aluminum alloy or a titanium alloy. Since the aluminum alloy or the titanium alloy has a high specific strength, the weight of the frame portion 3 can be reduced by using them. Examples of the aluminum alloy to be used include duralumin, super duralumin, ultra super duralumin, and the like, and specific examples include a 2000-based aluminum alloy and a 7000-based aluminum alloy. Among them, 7075-T6 alloy excellent in both tensile strength and proof stress is preferably used. Examples of the titanium alloy used include α + β-type titanium alloy and β-type titanium alloy.

In the vicinity of the bolt hole 23, a cladding portion 55 is formed by a plasma powder cladding process. This overlay 55
Has a higher hardness than the base material and has excellent wear resistance. Therefore, even if stress concentrates when the blade portion 5 is opened and closed, the vicinity of the bolt hole 23 is less likely to be deformed, and even if the frame portion 3 slides with the blade portion bolt 45, nut, etc. Wear is prevented. When the base material is an aluminum alloy, the powder used for the overlay is preferably one that reacts with molten aluminum to form a compound from the viewpoint of increasing hardness. Preferred elements that react with aluminum include metal elements such as copper and iron, nitrogen, oxygen, boron, carbon, and the like, and it is preferable to use a powder containing these. In particular, when a powder containing a metal element such as copper or iron is used, an intermetallic compound such as CuAl ₂ or FeAl ₃ is generated in the cladding portion 55, and an appropriate hardness can be given to the cladding portion 55. It is preferable because it is possible.

Although the surface of the frame portion 3 is hardened by the plasma powder overlaying process, any process other than the plasma powder overlaying process can be used as long as the process can improve the wear resistance near the bolt holes 23. Processing can also be employed.

FIG. 5 is a sectional view of a cylinder 11 of a life-saving rescue machine according to an embodiment of the present invention. The cylinder 11 includes a base material layer 57 and the base material layer 57.
And the surface treatment layer 59 inside.

The material of the base material layer 57 is made of an aluminum alloy or a titanium alloy. Since the aluminum alloy or the titanium alloy has a high specific strength, the weight of the cylinder 11 can be reduced by using them. Examples of the aluminum alloy to be used include duralumin, super duralumin, ultra super duralumin, and the like, and specific examples include a 2000-based aluminum alloy and a 7000-based aluminum alloy. Among them, 7075-T6 alloy excellent in both tensile strength and proof stress is preferably used.
Examples of the titanium alloy used include α + β-type titanium alloy and β-type titanium alloy.

The surface treatment layer 59 has better wear resistance than the base material layer 57. Therefore, even when the piston 19 slides on the inner peripheral surface of the surface treatment layer, the inner peripheral surface is prevented from being worn. The method for forming the surface treatment layer may be any method that can improve the wear resistance of the surface treatment layer. As a method for forming the surface treatment layer 59, for example, a deposition method such as PVD or CVD, a surface modification method by high energy density beam treatment, an electrodeposition method (electroplating method), a chemical plating method (electroless plating method), and immersion Examples include a treatment method (hot-dip plating method), an anodizing method by anodic oxidation, a diffusion infiltration method, and a thermal spraying method. A preferred surface treatment method is a chemical plating method because an electrode is not required and a surface treatment layer 59 having a uniform thickness can be obtained. Among these chemical plating methods, the coating has a Vickers hardness of 550 to 5.
Nickel-phosphorus composite plating is particularly preferred because it is as hard as 60 and has excellent adhesion. This type of surface treatment may be applied to the outer peripheral surface of the piston 19.

In this embodiment, the blade 5 and the frame 3
And all the cylinders 11 are made of a lightweight material to reduce the total weight of the life-saving rescue cutter. However, even when only some of these members are made of a lightweight material, Lightening to some extent can be achieved.

[0037]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an example of a method for manufacturing a life-saving rescuer according to the present invention will be described based on embodiments. Of course, the present invention should not be construed as being limited based on the description of this embodiment.

[Preparation of Blade] A base metal 4 having a predetermined shape using an α + β type titanium alloy (the above-mentioned Ti-6Al-4V alloy).
9 was formed, and the first-step solution treatment was performed at 970 ° C. for 1 hour. And alloy tool steel (SKS mentioned above)
The cutting edge portions 39a and 39b of a predetermined shape were formed by using 3), and were mounted on the base 49. At this time, the base metal 49 and the blade tip 3
A plate-shaped silver solder (trade name “sil 106” manufactured by Nice Co., Ltd.) was sandwiched between 9a and 39b. These were left in a furnace at 850 degrees Celsius for one hour and then cooled with oil. By this heating and cooling, the base metal 49 is subjected to a second-stage solution treatment, and the cutting edge portions 39a and 39b are quenched.
The silver solder is melted and solidified, and the base 49 and the cutting edges 39a, 39
b was joined. The blade 5 was aged at 400 degrees Celsius. By performing the heat treatment (solution treatment and quenching) and brazing of the base metal 49 and the blade edge portions 39a and 39b by a single heating and cooling process, the process of manufacturing the blade portion 5 can be simplified. , Energy saving can be achieved.
Also, if solution treatment of the base metal 49 and quenching of the cutting edges 39a and 39b are performed prior to brazing, solute atoms of the base metal 49 precipitate due to heating during brazing, and the toughness of the base metal 49 increases. There is a possibility that the crystallinity of the cutting edge portions 39a and 39b becomes coarse and the toughness of the cutting edge portions 39a and 39b is reduced, but the solution treatment, quenching and By performing brazing, precipitation of solute atoms and coarsening of crystal grains can be prevented.

The Vickers hardness of the base metal 49 of the obtained blade 5 was about 370, and the Vickers hardness of the blades 39a and 39b was about 530. The joint has a shear strength of 50
N / mm ² . Further, the weight of the blade 5 is determined by the upper blade 37.
a and the lower blade 37b weighed about 1.2 kg each.

[Preparation of Frame 3] Next, a method of preparing the frame 3 will be described with reference to FIG. Although only the upper plate 51 of the frame portion 3 is shown in FIG. 6, the lower plate 53 has a shape obtained by inverting FIG.
The processing of No. 3 is performed according to the processing of the upper plate 51.

7000 series aluminum alloy (70
75-T6 alloy) into a predetermined shape,
Prototype was formed. Next, bolt holes 23 were formed in the upper plate 51 and the lower plate 53 with a cutting tool as shown in FIG. Next, as shown in FIG. 6B, the outer diameter of the bolt hole 23 (the upper plate 51 is closer to the upper side, and the lower plate 53 is closer to the lower side) is increased by a cutting tool having a large cutting diameter. Then, using a powder of an Al-33Cu-5Zn-1Mg alloy, a cladding portion 55 was formed on the enlarged diameter portion by plasma powder cladding as shown in FIG. 6C. As a result, the intermetallic compound Cu
Al ₂ can be generated. After the built-up portion 55 was ground into a shape as shown in FIGS. 4C and 4D, a heat treatment (T6 treatment) was performed to produce the frame portion 3.

The Vickers hardness of the obtained frame portion 3 is about 190, and the Vickers hardness of the overlay portion 55 is about 29.
It was 0. The weight of the frame 3 was about 1.7 kg.

[Preparation of Cylinder 11] A base material layer 57 was formed by processing a 7000 series aluminum alloy (the above-mentioned 7075-T6 alloy) into a predetermined shape. This was degreased in acetone, and further degreased for 2 minutes in a 50 ° C. alkaline solution containing 10 g of sodium phosphate and 10 g of sodium gluconate in 1 liter. Further, an etching treatment was performed for 30 seconds in an etching solution containing 50 g of sodium hydroxide and 10 g of sodium gluconate in one liter at 50 degrees Celsius. Furthermore, zinc substitution treatment was performed for 1 minute in a zinc substitution treatment liquid at 230 degrees Celsius containing 500 g of sodium hydroxide, 100 g of zinc oxide, 2 g of ferric chloride, and 10 g of Rochelle salt in 1 liter. did. Further, after the zinc coating was peeled off in nitric acid, the zinc substitution treatment was performed again under the above conditions. By these pretreatments, the oxide film on the surface of the base material layer 57 can be removed, and the elution of the base material layer 57 in a later plating process can be prevented.

One liter contains 23 g of nickel sulfate, 24 g of sodium succinate, 13 g of DL-malic acid and 30 g of sodium hypophosphite.
The pretreated base material was subjected to chemical plating for 30 minutes in a plating solution having a temperature of 5 and a temperature of 80 degrees Celsius to form a surface treatment layer 59. After the plating treatment, it was kept at 120 degrees Celsius for 2 hours. This results in a Vickers hardness of 56
0 was obtained.

[Production of Other Members] Piston rod 2
1. The piston 19, the head cover 15, and the grip handle 7 were made of an aluminum alloy (7075-T6 alloy). Also, the clevis 25, the bolt 13, and the link plates 27a, 27b are made of an α + β type titanium alloy (Ti
-6Al-4V alloy). Further, the clevis pin 35, the blade bolt 45, and the link pins 47a, 47b
With a β-type titanium alloy (Ti-15Mo-5Zr-3Al
Alloy).

[Assembly of Life-Saving Cutting Machine] A life-saving cutting machine as shown in FIGS. 1 and 2 was prepared by combining the above-mentioned members. The lifesaving cutting machine had a maximum load capacity of 20 tons and a total weight of 9.9 kg. As described above, the life-saving rescuer according to the present invention was able to reduce the weight by about 30% compared to the total weight of the conventional life-saver cutting machine having the same maximum load capacity.

[0047]

As described above, according to the present invention,
A life-saving rescuer with a reduced total weight can be provided without impairing the wear resistance of the cutting edge, the frame and the cylinder.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a lifesaving cutting machine according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing the life-saving rescue cutting machine shown in FIG. 1;

3 (a) is a plan view showing a blade portion of the life-saving rescue cutter shown in FIG. 1, and FIG. 3 (b) is a plan view of FIG.
It is sectional drawing along the AA of (a).

FIG. 4 (a) is a plan view showing a frame portion of the life-saving rescue cutting machine shown in FIG. 1, and FIG. 4 (b) is taken along a line BB in FIG. 4 (a). FIG. 4C is a cross-sectional view taken along FIG.
4B is an enlarged sectional view of a portion C surrounded by a dotted circle in FIG. 4B, and FIG. 4D is an enlarged sectional view of a portion D surrounded by a dotted circle in FIG. 4B. .

FIG. 5 is a cross-sectional view illustrating a cylinder of the life-saving remedy cutting machine illustrated in FIG. 1;

FIGS. 6 (a) to 6 (c) are enlarged cross-sectional views showing a state in which a portion near the bolt hole shown in FIGS. 4 (c) and 4 (d) is manufactured.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Cylinder part 3 ... Frame part 5 ... Blade part 7 ... Grip handle 9 ... Handle 11 ... Cylinder 13 ... Bolt 15 ... Head cover 17 ... Hydraulic path 19 ... Piston 21 ... Piston rod 23 ... Bolt hole 25 ... Clevis 27a, 27b ... Link plate 29 ... Clevis hole 31a, 31b ... Front end hole 33a, 33b ... Rear end hole 35 Clevis pin 37a Upper blade 37b Lower blade 39a, 39b Cutting edge 41a, 41b Support hole 43a, 43b Link hole 45 Cutting edge Bolts 47a, 47b Link pin 49 Base metal 51 Upper plate 53 Lower plate 55 Overlay portion 57 Base material layer 59 Surface treatment layer

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-177427 (JP, A) JP-A-8-502210 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B26D 1/00 B23D 29/00

Claims (3)

(57) [Claims] 1. A life-saving rescuer in which a blade is formed by joining a blade made of a steel material to a base made of a titanium alloy , wherein the base is brazed to the blade.
At the time of joining, the above soldering and the solution of the base metal
For life-saving by aging treatment and hardening of the cutting edge
Cutting machine . 2. A piston comprising a piston and a cylinder enclosing the piston, a cylinder portion for reciprocating the piston by hydraulic pressure, and a blade connected to the piston and opening and closing as the piston reciprocates. a lifesaving cutting machine equipped with a section, the blade portion is constituted by the cutting edges made of steel material to a base metal made of a titanium alloy is bonded, the base metal and the blade
When joining the tip with brazing,
Sometimes performed quenching solution treatment and cutting edge of the base metal, the cylinder of aluminum alloy or titanium alloy has a main material, a surface treatment for improve abrasion resistance is given to an inner peripheral surface of the cylinder A life-saving rescue cutting machine. 3. The life-saving rescuer according to claim 2 , wherein said surface treatment is nickel-phosphorus composite plating.