CN110026611A - A kind of cutting part and its manufacturing method - Google Patents

Abstract

The invention discloses a cutting part. The cutting part comprises a base body, a cutting edge and a welding part; the base body is composed of a first metal part, and the first metal part has a first side surface; the cutting edge consists of a second metal part and a third metal part for the cutting edge. The metal parts are formed by cladding, the second metal part is high-strength alloy steel and has a second side surface; the third metal part is high-speed tool steel and has a third side surface; the welding part connects the first metal part and the second metal part, The present invention also provides a method for manufacturing a cutting part, wherein the composite steel strip is welded to a base body to form an embryonic body of the cutting part, and then the welded part is subjected to low temperature tempering treatment. The cutting part of the present invention adopts a three-metal structure, and uses low-cost medium and high carbon steel or low-alloy steel as the base material, which can reduce the cost when it is applied to a larger size hand saw, and the hand saw teeth use M2, M42, M35 For high-speed steel materials such as high-speed steel, the wear resistance is greatly improved, and the service life of the saw is increased.

Description

A cutting part and its manufacturing method

technical field

The present invention relates to a cutting member, in particular to a cutting member formed by welding metal materials, and a manufacturing method thereof.

Background technique

The common plate sawtooth tip materials mostly use overall medium and high carbon steel or low alloy steel, such as 65Mn, SK5, 50#, etc., but due to material limitations, the tooth tip wear resistance of the plate saw with this material as a whole is poor.

If the entire panel saw uses an ultra-wide bimetallic clad steel strip, the width of which is more than 90mm, because the back material of the bimetallic clad steel band saw blade is generally made of high-strength alloy steel, the total content of alloy elements exceeds 5.0%, the cost is too high, and the market is competitive Not very powerful.

In addition, after using the ultra-wide bimetallic clad steel strip, the high-speed steel wire, such as M2, M42, etc., is butt welded with the high-strength alloy steel as the backing material, such as D6A, X32, etc., the subsequent heat treatment process should be in accordance with the high-speed The overall heat treatment of the steel process requires high temperature tempering, which will lead to low hardness of the saw blade matrix, only about HRC30, poor strength, large deformation of the saw blade and difficult to control.

SUMMARY OF THE INVENTION

In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a cutting part with both wear resistance, toughness and high hardness.

The present invention provides a cutting member,

The cutting part includes the base body, the blade and the welding part;

The base body is composed of a first metal part, and the first metal part is medium and high carbon steel or low alloy steel, and has a first side surface;

The blade is formed by cladding a second metal part and a third metal part for the cutting edge, the second metal part is high-strength alloy steel and has a second side surface; the third metal part is high-speed tool steel and has a third side surface ;

The welding portion connects the first metal portion and the second metal portion.

Further, the cutting edge is a composite steel strip formed by cladding the second metal part and the third metal part for the cutting edge.

Further, the hardness of the high-speed tool steel is 58-72HRC.

Further, the hardness of the high-strength alloy steel is 38-52HRC.

Further, the hardness of medium and high carbon steel or low alloy steel is 38-52HRC.

Further, the carbon content of the second metal part is 0.30-0.60%, and the total content of alloy elements is 2.0-8.0%.

Further, the alloying elements include any one or more of Cr, V, Mo, Ni, W, Ti, Si and Mn.

Further, the high-strength alloy steel includes any one or more of D6A, X32 and 50CrV.

Further, the third metal part is high-speed tool steel with a carbon content of not less than 0.70%.

Further, the high speed tool steel includes M2, M42 or M35.

Further, the hardness of medium and high carbon steel or low alloy steel is 38-52HRC.

Further, the first metal part includes 65Mn, SK5 and 50# steel.

Further, the width of the third metal portion is 1.0-4.0 mm.

Further, the width of the second metal portion is 2.0-30.0 mm.

Further, the width of the first metal portion is 30.0-100.0 mm.

The present invention also provides a hand panel saw, which includes the cutting member as described above.

The present invention also provides a method for manufacturing a cutting part, the manufacturing method comprising welding a composite steel strip composed of a second metal part and a third metal part to a base body to form a blank of the cutting part, and the welding process occurs in the second metal part and the first metal part of the base body, after welding, a welding part is formed between the second metal part and the first metal part, and then the welding part is subjected to low temperature tempering treatment to eliminate the welding stress of the welding part.

Further, the tempering temperature of the low-temperature tempering treatment is 180-450° C., and the holding time is 60-240 minutes.

Further, after the low temperature tempering treatment, the hardness of the third metal part is reduced by no more than 1.0HRC, and the hardness of the first metal part and the second metal part is reduced by no more than 2.0HRC.

Further, the composite steel strip composed of the second metal part and the third metal part is welded to the base body by high-energy beam welding to form the blank body of the cutting part.

Further, the high-energy beam welding includes laser welding, electron beam welding or ion beam welding.

Further, the metallographic structure of the second metal part close to the welding part is cryptoneedle martensite and partial carbide structure.

Further, the metallographic structure of the first metal near the welded portion contains martensite, ferrite and carbide structures.

Further, the depth of the welding heat affected zone of the first metal part and the second metal part is not more than 3.0 mm.

Further, pulse laser welding with a wavelength of 1064 nm is used, and the movement speed of the welding torch is 5-50 mm/s.

Further, when using continuous laser welding with a wavelength of 1070nm±10nm doped with rare earth, the movement speed of the laser welding head is 5-50mm/s.

The present invention has the following beneficial effects:

1. The cutting part of the present invention adopts a three-metal structure, and uses low-cost medium and high carbon steel or low-alloy steel as the base material, which can reduce the cost when it is applied to a larger size hand saw, and the hand saw tooth tips use M2, M42 , M35 and other high-speed steel materials, the wear resistance has been greatly improved, and the service life of the saw has been improved.

2. The cutting part of the present invention can adopt the bimetallic composite steel strip produced by mature commercialization, and the bimetallic composite steel strip can be welded after heat treatment, so as to ensure the hardness of the saw blade and the tooth part, so that the tooth tip can obtain high wear resistance, and at the same time. The high toughness of the saw blade is guaranteed.

3. The conventional saw blade is used as the base body, and the narrow bimetallic composite steel belt is used as the tooth material, and the saw has a high cost performance.

Description of drawings

Fig. 1 is a kind of schematic diagram of a kind of cutting part provided by the present invention;

Fig. 2 is the partial sectional view of Fig. 1;

Fig. 3 is the partial enlarged schematic diagram of Fig. 2;

FIG. 4 is a process flow diagram of a method for manufacturing a cutting part provided by the present invention.

In the figure, the base body 1 , the first metal part 11 , the blade 2 , the second metal part 21 , and the third metal part 22 .

Detailed ways

The present invention will be described in further detail below with reference to the accompanying drawings and data. It should be understood that the embodiments are only intended to illustrate the invention and not to limit the scope of the invention in any way.

As shown in Figures 1-3, the present invention provides a cutting part,

The cutting part includes a base body, a blade and a welding part; it adopts a three-metal structure, that is, it is formed by combining three metal materials with different properties.

The base body is composed of a first metal part, and the first metal part is medium and high carbon steel or low alloy steel, and has a first side surface;

The blade is formed by cladding a second metal part and a third metal part for the cutting edge, the second metal part is high-strength alloy steel and has a second side surface; the third metal part is high-speed tool steel and has a third side surface ;

The welding portion connects the first metal portion and the second metal portion.

The medium and high carbon steel or low alloy steel is selected as the substrate of the cutting part, which bears most of the back material of the cutting part, and greatly reduces the overall cost of the cutting part.

High-strength alloy steel is selected as the transition part of the welding. The welding occurs between the first metal part and the second metal part. After welding, low temperature tempering is directly used to eliminate the welding stress at the weld of the first metal part and the second metal part. , so the structure of this product can realize the low temperature treatment to realize the welding stress relief of the first metal part and the second metal part, and obtain a cutting part with low cost and excellent cutting edge wear resistance.

Among them, the hardness of high-speed tool steel is 58-72HRC, and the carbon content is not less than 0.70% of high-speed tool steel. In a preferred embodiment, the high-speed tool steel includes M2, M42, and M35.

The hardness of high strength alloy steel is 38-52HRC. The carbon content of the high-strength alloy steel of the second metal part is 0.30-0.60%, and the total content of alloy elements is 2.0-8.0%. Alloying elements include, but are not limited to, Cr, V, Mo, Ni, W, Ti, Si, and Mn. In a preferred embodiment, D6A, X32 and 50CrV can be selected as high-strength alloy steels.

The hardness of medium and high carbon steel or low alloy steel is 38-52HRC, and the hardness of the first metal part is 38-52HRC. In a preferred embodiment, the first metal part includes 65Mn, SK5 and 50#. Preferably, the width of the first metal portion is 30.0-100.0 mm.

In one embodiment, the width of the blade is narrow, specifically, the width of the third metal portion is 1.0-4.0 mm, and the width of the second metal portion is 2.0-30.0 mm.

In one embodiment, the cutting edge is a composite steel strip formed by cladding the second metal part and the third metal part for the cutting edge. The clad steel strip can be a mature commercial production bimetallic steel strip.

In one embodiment, the present invention provides a hand panel saw, which includes the above-mentioned cutting part, preferably, the width of the first metal part of the hand panel saw is 30.0-100.0 mm.

As shown in FIG. 4 , the present invention also provides a method for manufacturing a cutting part, the manufacturing method includes welding a composite steel strip composed of a second metal part and a third metal part to a base body to form a blank body of the cutting part, and the welding process Occurs between the second metal part and the first metal part as the base. After welding, a welded part is formed between the second metal part and the first metal part, and then the welded part is subjected to low temperature tempering treatment to eliminate the welding part. Welding stress.

The welding process is as follows:

The composite steel strip composed of the second metal part and the third metal part is welded to the base body by high-energy beam welding to form the blank body of the cutting part. After welding, the metallographic structure of the second metal part close to the welded part contains hidden needle martensite and partial carbide structure. The metallographic structure of the first metal near the welded part contains martensite, ferrite and carbide structures. The depth of the welding heat affected zone of the first metal part and the second metal part is not more than 3.0mm. Preferably, when using pulsed laser welding with a wavelength of 1064 nm, the movement speed of the welding torch is 5-50 mm/s; or when using continuous laser welding with a wavelength of 1070 nm±10 nm doped with rare earths, the moving speed of the laser welding head is 5-50 mm/s.

In one embodiment, a panel saw blade is used as the base.

In one embodiment, the high-energy beam welding adopts laser welding, electron beam welding, and ion beam welding.

The low temperature tempering treatment is as follows:

The tempering temperature of the low temperature tempering treatment is 180-450°C, and the holding time is 60-240 minutes.

After the low temperature tempering treatment, the hardness of the third metal part is reduced by no more than 1.0 HRC, and the hardness of the first metal part and the second metal part is reduced by no more than 2.0 HRC.

The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make many modifications and changes according to the concept of the present invention without creative efforts. Therefore, all technical solutions that can be obtained by those skilled in the art through logical analysis, reasoning or limited experiments on the basis of the prior art according to the concept of the present invention shall fall within the protection scope determined by the claims.

Claims (26)

1. a kind of cutting part, which is characterized in that

The cutting part includes matrix, blade and weld part；

Described matrix is made of the first metal portion, and first metal portion is medium and high carbon steel or low-alloy steel, has first side；

For the blade by the second metal portion and for the laminating formation of third metal portion of cutting edge, second metal portion is high intensity Steel alloy, and there is second side；The third metal portion is high-speed tool steel, and has third side；

The weld part connects first metal portion and the second metal portion.

2. a kind of cutting part as described in claim 1, which is characterized in that the blade is by the second metal portion and to be used for sword The composite steel band of the laminating formation of third metal portion of mouth.

3. a kind of cutting part as described in claim 1, which is characterized in that the hardness of the high-speed tool steel is 58- 72HRC。

4. a kind of cutting part as described in claim 1, which is characterized in that the hardness of the high strength alloy steel is 38- 52HRC。

5. a kind of cutting part as described in claim 1, which is characterized in that the hardness of the medium and high carbon steel or low-alloy steel is 38-52HRC。

6. a kind of cutting part as described in claim 1, which is characterized in that the phosphorus content of second metal portion is 0.30- 0.60%, and alloying element total content is 2.0-8.0%.

7. a kind of cutting part as claimed in claim 6, which is characterized in that the alloying element include Cr, V, Mo, Ni, W, Any one or more in Ti, Si and Mn.

8. a kind of cutting part as described in claim 1, which is characterized in that the high strength alloy steel include D6A, X32 and Any one or more in 50CrV.

9. a kind of cutting part as described in claim 1, which is characterized in that the third metal portion is not less than for phosphorus content 0.70% high-speed tool steel.

10. a kind of cutting material as described in claim 1, which is characterized in that the high-speed tool steel include M2, M42 or M35。

11. a kind of cutting part as described in claim 1, which is characterized in that the hardness of the medium and high carbon steel or low-alloy steel For 38-52HRC.

12. a kind of cutting part as described in claim 1, which is characterized in that first metal portion include 65Mn, SK5 and 50# steel.

13. a kind of cutting part as described in claim 1, which is characterized in that the width of the third metal portion is 1.0- 4.0mm。

14. a kind of cutting part as described in claim 1, which is characterized in that the width of second metal portion is 2.0- 30.0mm。

15. a kind of cutting part as described in claim 1, which is characterized in that the width of first metal portion is in 30.0- 100.0mm。

16. a kind of panel saw, which is characterized in that the panel saw includes cutting part described in claim 1-15.

17. a kind of manufacturing method of cutting part, which is characterized in that the manufacturing method includes will be by the second metal portion and third The composite steel band of metal portion composition is soldered to the idiosome that the cutting part is formed on matrix, and welding process occurs in the second metal Between portion and the first metal portion of matrix, weld part is formed after welding between the second metal portion and the first metal portion, it is then right Weld part carries out lonneal processing, to eliminate the welding stress of weld part.

18. a kind of manufacturing method of cutting part as claimed in claim 17, which is characterized in that the lonneal processing Tempering temperature is 180-450 DEG C, and soaking time is 60-240 minutes.

19. a kind of manufacturing method of cutting part as claimed in claim 17, which is characterized in that in lonneal processing Afterwards, the hardness of the third metal portion, which reduces, is no more than 1.0HRC, and the hardness of first metal portion and the second metal portion reduces No more than 2.0HRC.

20. a kind of manufacturing method of cutting part as claimed in claim 17, which is characterized in that will using high energy beam current welding The idiosome that the cutting part is formed on matrix is soldered to by the composite steel band that the second metal portion and third metal portion form.

21. a kind of manufacturing method of cutting part as claimed in claim 20, which is characterized in that the high energy beam current welding packet Include laser welding, electron beam welding or ion-beam welding.

22. a kind of manufacturing method of cutting part as claimed in claim 17, which is characterized in that second metal portion is close The structure of weld part is cryptocrystalline martensite and partially carbonized object tissue.

23. a kind of manufacturing method of cutting part as claimed in claim 17, which is characterized in that first metal is close to weldering The structure of socket part contains martensite, ferrite and carbide tissue.

24. a kind of manufacturing method of cutting part as claimed in claim 20, which is characterized in that first metal portion and the The welding heat affected zone depth of two metal portions is no more than 3.0mm.

25. a kind of manufacturing method of cutting part as claimed in claim 20, which is characterized in that using the arteries and veins of wavelength 1064nm Impulse photocoagulation, the movement velocity of welding gun is in 5~50mm/s.

26. a kind of manufacturing method of cutting part as claimed in claim 20, which is characterized in that using the wavelength for supporting by the arm rare earth When the continuous laser welding of 1070nm ± 10nm, the movement velocity of laser welding head is in 5~50mm/s.