Blade material for shearing machine and preparation method thereof

Abstract

The invention relates to the technical field of shearing tool materials, and discloses a blade material for a shearing machine and a preparation method of the blade material. The blade material for the shearing machine comprises the following chemical component raw materials: 5.0%-8.0% of Cr, 5.0%-8.0% of Co, 2.0%-3.0% of C, 0.5%-1.5% of Mn, 0.05%-0.1% of N and the balance of Fe. According to the blade material for the shearing machine, the Rockwell hardness can reach HRC65, the 60min abrasion weight loss can reach 104 mg, and the blade material has high mechanical performance and abrasion resistance and can be applied to preparation of shearing blades.

Description

Technical Field

[0001] The invention relates to the technical field of shearing tool materials, and in particular to a blade material for a shearing machine and a preparation method thereof. Background Art

[0002] With the vigorous development of the steel industry, self-produced scrap steel cannot meet the production demand, and the amount of recycled scrap steel is increasing year by year. The main sources of recycled scrap steel are processing scrap steel and depreciation scrap steel, among which depreciation scrap steel is the largest source of recycled scrap steel and also the most difficult to recycle.

[0003] After the scrap steel enters the site, most of it needs to be shortened by hydraulic shears (crocodile shears, gantry shears and box shears, etc.) or combined punching and shearing machines. Since the scrap steel sheets are uneven in thickness and irregular in shape, they are often attached with a small amount of cement and sand, especially the bars in the scrap steel, most of which are rebars scrapped from construction, including illegally produced unbranded and miscellaneous steel bars, which are brittle and hard with high hardness. When using crocodile shears and combined punching and shearing machines to shorten them, the working conditions are very harsh. The existing shear blades are usually made of heat-treated T10 steel. This type of shear blade wears quickly and is prone to curling, deformation, and even collapse. These problems seriously restrict production costs and production cycles. Therefore, the development of a self-hardening iron-based shear blade material with high mechanical properties and wear resistance has become a technical problem that needs to be urgently solved by technicians in this field. Summary of the invention

[0004] The purpose of the present invention is to provide a shearing machine blade material and a preparation method thereof, wherein the shearing machine blade material has higher mechanical properties and wear resistance.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] One of the technical solutions of the present invention:

[0007] A blade material for a shearing machine, comprising the following chemical composition raw materials:

[0008] Cr 5.0%~8.0%, Co 5.0%~8.0%, C 2.0%~3.0%, Mn 0.5%~1.5%, Ni0.05%~0.1%, and the balance is Fe.

[0009] The second technical solution of the present invention:

[0010] The method for preparing the above-mentioned shearing machine blade material comprises the following steps:

[0011] 1) Weigh each raw material according to the above chemical composition;

[0012] 2) mixing the raw materials weighed in step 1) and smelting them to obtain a molten liquid metal mixture;

[0013] 3) pouring the molten liquid metal mixture obtained in step 2) into a mold to obtain an iron-based alloy;

[0014] 4) placing the iron-based alloy obtained in step 3) in a carbon source gas and subjecting it to carburizing treatment to obtain the shear blade material.

[0015] Furthermore, in step 2), the smelting is specifically: smelting at 1300-1500° C. for 1-2 hours.

[0016] Furthermore, in step 4), the carbon source gas is specifically: 60% butane + 40% air.

[0017] Furthermore, in step 4), the carburizing treatment is specifically: carburizing treatment at 800-1000° C. for 5-10 hours.

[0018] Furthermore, in step 4), after the carburizing treatment is completed, the iron-based alloy needs to be subjected to isothermal quenching treatment.

[0019] Furthermore, the isothermal quenching treatment is specifically: isothermal quenching treatment at 350° C. for 1 hour.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention provides a shearing machine blade material with a Rockwell hardness of up to HRC65 and a 60-minute wear weight loss of up to 104 mg. The material has high mechanical properties and wear resistance and can be applied to the preparation of shearing blades. DETAILED DESCRIPTION

[0022] Now, various exemplary embodiments of the present invention are described in detail, and this detailed description should not be considered as a limitation of the present invention, but should be understood as a more detailed description of certain aspects, characteristics and embodiments of the present invention. It should be understood that the terms described in the present invention are only for describing specific embodiments and are not used to limit the present invention.

[0023] In addition, for the numerical range in the present invention, it is understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Each smaller range between the intermediate value in any stated value or stated range and any other stated value or intermediate value in the range is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded in the scope.

[0024] Unless otherwise indicated, all technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art. Although the present invention describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials associated with the documents. In the event of a conflict with any incorporated document, the content of this specification shall prevail.

[0025] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments of the present invention description without departing from the scope or spirit of the present invention. Other embodiments derived from the present invention description will be apparent to the skilled artisan. The present invention description and examples are exemplary only.

[0026] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0027] The raw materials used in the following examples are all commercially available.

[0028] In the following embodiments, a method for preparing a blade material for a shearing machine comprises the following steps:

[0029] 1) Weigh each raw material according to the following chemical composition:

[0030] Cr 5.0%~8.0%, Co 5.0%~8.0%, C 2.0%~3.0%, Mn 0.5%~1.5%, Ni0.05%~0.1%, the balance is Fe;

[0031] 2) mixing the raw materials weighed in step 1), and smelting at 1300-1500° C. for 1-2 hours to obtain a molten liquid metal mixture;

[0032] 3) pouring the molten liquid metal mixture obtained in step 2) into a mold to obtain an iron-based alloy;

[0033] 4) placing the iron-based alloy obtained in step 3) in a mixed atmosphere of 60% butane + 40% air, carburizing it at 800-1000° C. for 5-10 hours, and then isothermally quenching it at 350° C. for 1 hour to obtain the shear blade material.

[0034] Example 1

[0035] A blade material for shearing machine

[0036] 1) Weigh each raw material according to the following chemical composition:

[0037] Cr 5.0%, Co 5.0%, C 2.0%, Mn 0.5%, Ni 0.05%, balance Fe;

[0038] 2) mixing the raw materials weighed in step 1), and smelting at 1300° C. for 1 h to obtain a molten liquid metal mixture;

[0039] 3) pouring the molten liquid metal mixture obtained in step 2) into a mold to obtain an iron-based alloy;

[0040] 4) The iron-based alloy obtained in step 3) is placed in a mixed atmosphere of 60% butane + 40% air, carburized at 800° C. for 5 h, and then isothermally quenched at 350° C. for 1 h to obtain the shear blade material.

[0041] Example 2

[0042] A blade material for shearing machine

[0043] 1) Weigh each raw material according to the following chemical composition:

[0044] Cr 6.5%, Co 6.5%, C 2.5%, Mn 1.0%, Ni 0.07%, balance Fe;

[0045] 2) mixing the raw materials weighed in step 1), and smelting at 1400° C. for 1.5 h to obtain a molten liquid metal mixture;

[0046] 3) pouring the molten liquid metal mixture obtained in step 2) into a mold to obtain an iron-based alloy;

[0047] 4) The iron-based alloy obtained in step 3) is placed in a mixed atmosphere of 60% butane + 40% air, carburized at 800° C. for 5 h, and then isothermally quenched at 350° C. for 1 h to obtain the shear blade material.

[0048] Example 3

[0049] A blade material for shearing machine

[0050] 1) Weigh each raw material according to the following chemical composition:

[0051] Cr 8.0%, Co 8.0%, C 3.0%, Mn 1.5%, Ni 0.1%, the balance is Fe;

[0052] 2) mixing the raw materials weighed in step 1), and smelting at 1500° C. for 2 h to obtain a molten liquid metal mixture;

[0053] 3) pouring the molten liquid metal mixture obtained in step 2) into a mold to obtain an iron-based alloy;

[0054] 4) The iron-based alloy obtained in step 3) is placed in a mixed atmosphere of 60% butane + 40% air, carburized at 800° C. for 5 h, and then isothermally quenched at 350° C. for 1 h to obtain the shear blade material.

[0055] Comparative Example 1

[0056] A blade material for shearing machine

[0057] 1) Weigh each raw material according to the following chemical composition:

[0058] Cr 4.0%, Co 6.5%, C 2.5%, Mn 1.0%, Ni 0.07%, the balance is Fe;

[0059] 2) mixing the raw materials weighed in step 1), and smelting at 1400° C. for 1.5 h to obtain a molten liquid metal mixture;

[0060] 3) pouring the molten liquid metal mixture obtained in step 2) into a mold to obtain an iron-based alloy;

[0061] 4) The iron-based alloy obtained in step 3) is placed in a mixed atmosphere of 60% butane + 40% air, carburized at 800° C. for 5 h, and then isothermally quenched at 350° C. for 1 h to obtain the shear blade material.

[0062] Comparative Example 2

[0063] A blade material for shearing machine

[0064] 1) Weigh each raw material according to the following chemical composition:

[0065] Cr 9.0%, Co 6.5%, C 2.5%, Mn 1.0%, Ni 0.07%, the balance is Fe;

[0066] 2) mixing the raw materials weighed in step 1), and smelting at 1400° C. for 1.5 h to obtain a molten liquid metal mixture;

[0067] 3) pouring the molten liquid metal mixture obtained in step 2) into a mold to obtain an iron-based alloy;

[0068] 4) The iron-based alloy obtained in step 3) is placed in a mixed atmosphere of 60% butane + 40% air, carburized at 800° C. for 5 h, and then isothermally quenched at 350° C. for 1 h to obtain the shear blade material.

[0069] Comparative Example 3

[0070] A blade material for shearing machine

[0071] 1) Weigh each raw material according to the following chemical composition:

[0072] Cr 6.5%, Co 4.0%, C 2.5%, Mn 1.0%, Ni 0.07%, the balance is Fe;

[0073] 2) mixing the raw materials weighed in step 1), and smelting at 1400° C. for 1.5 h to obtain a molten liquid metal mixture;

[0074] 3) pouring the molten liquid metal mixture obtained in step 2) into a mold to obtain an iron-based alloy;

[0075] 4) The iron-based alloy obtained in step 3) is placed in a mixed atmosphere of 60% butane + 40% air, carburized at 800° C. for 5 h, and then isothermally quenched at 350° C. for 1 h to obtain the shear blade material.

[0076] Comparative Example 4

[0077] A blade material for shearing machine

[0078] 1) Weigh each raw material according to the following chemical composition:

[0079] Cr 6.5%, Co 9.0%, C 2.5%, Mn 1.0%, Ni 0.07%, the balance is Fe;

[0080] 2) mixing the raw materials weighed in step 1), and smelting at 1400° C. for 1.5 h to obtain a molten liquid metal mixture;

[0081] 3) pouring the molten liquid metal mixture obtained in step 2) into a mold to obtain an iron-based alloy;

[0082] 4) The iron-based alloy obtained in step 3) is placed in a mixed atmosphere of 60% butane + 40% air, carburized at 800° C. for 5 h, and then isothermally quenched at 350° C. for 1 h to obtain the shear blade material.

[0083] Comparative Example 5

[0084] A blade material for shearing machine

[0085] 1) Weigh each raw material according to the following chemical composition:

[0086] Cr 6.5%, Co 6.5%, C 1.0%, Mn 1.0%, Ni 0.07%, balance Fe;

[0087] 2) mixing the raw materials weighed in step 1), and smelting at 1400° C. for 1.5 h to obtain a molten liquid metal mixture;

[0088] 3) pouring the molten liquid metal mixture obtained in step 2) into a mold to obtain an iron-based alloy;

[0089] 4) The iron-based alloy obtained in step 3) is placed in a mixed atmosphere of 60% butane + 40% air, carburized at 800° C. for 5 h, and then isothermally quenched at 350° C. for 1 h to obtain the shear blade material.

[0090] Comparative Example 6

[0091] A blade material for shearing machine

[0092] 1) Weigh each raw material according to the following chemical composition:

[0093] Cr 6.5%, Co 6.5%, C 4.0%, Mn 1.0%, Ni 0.07%, balance Fe;

[0094] 2) mixing the raw materials weighed in step 1), and smelting at 1400° C. for 1.5 h to obtain a molten liquid metal mixture;

[0095] 3) pouring the molten liquid metal mixture obtained in step 2) into a mold to obtain an iron-based alloy;

[0096] 4) The iron-based alloy obtained in step 3) is placed in a mixed atmosphere of 60% butane + 40% air, carburized at 800° C. for 5 h, and then isothermally quenched at 350° C. for 1 h to obtain the shear blade material.

[0097] Comparative Example 7

[0098] A blade material for shearing machine

[0099] 1) Weigh each raw material according to the following chemical composition:

[0100] Cr 6.5%, Co 6.5%, C 2.5%, Mn 0.1%, Ni 0.07%, balance Fe;

[0101] 2) mixing the raw materials weighed in step 1), and smelting at 1400° C. for 1.5 h to obtain a molten liquid metal mixture;

[0102] 3) pouring the molten liquid metal mixture obtained in step 2) into a mold to obtain an iron-based alloy;

[0103] 4) The iron-based alloy obtained in step 3) is placed in a mixed atmosphere of 60% butane + 40% air, carburized at 800° C. for 5 h, and then isothermally quenched at 350° C. for 1 h to obtain the shear blade material.

[0104] Comparative Example 8

[0105] A blade material for shearing machine

[0106] 1) Weigh each raw material according to the following chemical composition:

[0107] Cr 6.5%, Co 6.5%, C 2.5%, Mn 2.0%, Ni 0.07%, balance Fe;

[0108] 2) mixing the raw materials weighed in step 1), and smelting at 1400° C. for 1.5 h to obtain a molten liquid metal mixture;

[0109] 3) pouring the molten liquid metal mixture obtained in step 2) into a mold to obtain an iron-based alloy;

[0110] 4) The iron-based alloy obtained in step 3) is placed in a mixed atmosphere of 60% butane + 40% air, carburized at 800° C. for 5 h, and then isothermally quenched at 350° C. for 1 h to obtain the shear blade material.

[0111] Comparative Example 9

[0112] A blade material for shearing machine

[0113] 1) Weigh each raw material according to the following chemical composition:

[0114] Cr 6.5%, Co 6.5%, C 2.5%, Mn 1.0%, Ni 0.01%, the balance is Fe;

[0115] 2) mixing the raw materials weighed in step 1), and smelting at 1400° C. for 1.5 h to obtain a molten liquid metal mixture;

[0116] 3) pouring the molten liquid metal mixture obtained in step 2) into a mold to obtain an iron-based alloy;

[0117] 4) The iron-based alloy obtained in step 3) is placed in a mixed atmosphere of 60% butane + 40% air, carburized at 800° C. for 5 h, and then isothermally quenched at 350° C. for 1 h to obtain the shear blade material.

[0118] Comparative Example 10

[0119] A blade material for shearing machine

[0120] 1) Weigh each raw material according to the following chemical composition:

[0121] Cr 6.5%, Co 6.5%, C 2.5%, Mn 1.0%, Ni 0.2%, the balance is Fe;

[0122] 2) mixing the raw materials weighed in step 1), and smelting at 1400° C. for 1.5 h to obtain a molten liquid metal mixture;

[0123] 3) pouring the molten liquid metal mixture obtained in step 2) into a mold to obtain an iron-based alloy;

[0124] 4) The iron-based alloy obtained in step 3) is placed in a mixed atmosphere of 60% butane + 40% air, carburized at 800° C. for 5 h, and then isothermally quenched at 350° C. for 1 h to obtain the shear blade material.

[0125] The mechanical properties and wear resistance of the shear blade materials prepared in Examples 1 to 3 and Comparative Examples 1 to 10 were tested. The results of the mechanical properties and wear resistance tests are shown in Table 1.

[0126] Table 1 Mechanical properties and wear resistance test results

[0127]

[0128] It can be seen from the data in Table 1 that the shearing machine blade material provided by the present invention has high mechanical properties and wear resistance; and changing the chemical composition of the shearing machine blade material will reduce the mechanical properties and wear resistance of the shearing machine blade material to a certain extent.

[0129] Example 4

[0130] A blade material for shearing machine

[0131] 1) Weigh each raw material according to the following chemical composition:

[0132] Cr 6.5%, Co 6.5%, C 2.5%, Mn 1.0%, Ni 0.07%, balance Fe;

[0133] 2) mixing the raw materials weighed in step 1), and smelting at 1400° C. for 1.5 h to obtain a molten liquid metal mixture;

[0134] 3) pouring the molten liquid metal mixture obtained in step 2) into a mold to obtain an iron-based alloy;

[0135] 4) The iron-based alloy obtained in step 3) is placed in a mixed atmosphere of 60% butane + 40% air, carburized at 900° C. for 8 h, and then isothermally quenched at 350° C. for 1 h to obtain the shear blade material.

[0136] Example 5

[0137] A blade material for shearing machine

[0138] 1) Weigh each raw material according to the following chemical composition:

[0139] Cr 6.5%, Co 6.5%, C 2.5%, Mn 1.0%, Ni 0.07%, balance Fe;

[0140] 2) mixing the raw materials weighed in step 1), and smelting at 1400° C. for 1.5 h to obtain a molten liquid metal mixture;

[0141] 3) pouring the molten liquid metal mixture obtained in step 2) into a mold to obtain an iron-based alloy;

[0142] 4) The iron-based alloy obtained in step 3) is placed in a mixed atmosphere of 60% butane + 40% air, carburized at 1000° C. for 10 h, and then isothermally quenched at 350° C. for 1 h to obtain the shear blade material.

[0143] Comparative Example 11

[0144] A blade material for shearing machine

[0145] 1) Weigh each raw material according to the following chemical composition:

[0146] Cr 6.5%, Co 6.5%, C 2.5%, Mn 1.0%, Ni 0.07%, balance Fe;

[0147] 2) mixing the raw materials weighed in step 1), and smelting at 1400° C. for 1.5 h to obtain a molten liquid metal mixture;

[0148] 3) pouring the molten liquid metal mixture obtained in step 2) into a mold to obtain an iron-based alloy;

[0149] 4) The iron-based alloy obtained in step 3) is placed in a mixed atmosphere of 80% butane + 20% air, carburized at 900° C. for 8 hours, and then isothermally quenched at 350° C. for 1 hour to obtain the shear blade material.

[0150] Comparative Example 12

[0151] A blade material for shearing machine

[0152] 1) Weigh each raw material according to the following chemical composition:

[0153] Cr 6.5%, Co 6.5%, C 2.5%, Mn 1.0%, Ni 0.07%, balance Fe;

[0154] 2) mixing the raw materials weighed in step 1), and smelting at 1400° C. for 1.5 h to obtain a molten liquid metal mixture;

[0155] 3) pouring the molten liquid metal mixture obtained in step 2) into a mold to obtain an iron-based alloy;

[0156] 4) The iron-based alloy obtained in step 3) is placed in a mixed atmosphere of 40% butane + 60% air, carburized at 900° C. for 8 h, and then isothermally quenched at 350° C. for 1 h to obtain the shear blade material.

[0157] Comparative Example 13

[0158] A blade material for shearing machine

[0159] 1) Weigh each raw material according to the following chemical composition:

[0160] Cr 6.5%, Co 6.5%, C 2.5%, Mn 1.0%, Ni 0.07%, balance Fe;

[0161] 2) mixing the raw materials weighed in step 1), and smelting at 1400° C. for 1.5 h to obtain a molten liquid metal mixture;

[0162] 3) pouring the molten liquid metal mixture obtained in step 2) into a mold to obtain an iron-based alloy;

[0163] 4) The iron-based alloy obtained in step 3) is placed in a mixed atmosphere of 60% methane + 40% air, carburized at 900° C. for 8 h, and then isothermally quenched at 350° C. for 1 h to obtain the shear blade material.

[0164] Comparative Example 14

[0165] A blade material for shearing machine

[0166] 1) Weigh each raw material according to the following chemical composition:

[0167] Cr 6.5%, Co 6.5%, C 2.5%, Mn 1.0%, Ni 0.07%, balance Fe;

[0168] 2) mixing the raw materials weighed in step 1), and smelting at 1400° C. for 1.5 h to obtain a molten liquid metal mixture;

[0169] 3) pouring the molten liquid metal mixture obtained in step 2) into a mold to obtain an iron-based alloy;

[0170] 4) The iron-based alloy obtained in step 3) is placed in a mixed atmosphere of 60% butane + 40% air, carburized at 700° C. for 8 h, and then isothermally quenched at 350° C. for 1 h to obtain the shear blade material.

[0171] Comparative Example 15

[0172] A blade material for shearing machine

[0173] 1) Weigh each raw material according to the following chemical composition:

[0174] Cr 6.5%, Co 6.5%, C 2.5%, Mn 1.0%, Ni 0.07%, balance Fe;

[0175] 2) mixing the raw materials weighed in step 1), and smelting at 1400° C. for 1.5 h to obtain a molten liquid metal mixture;

[0176] 3) pouring the molten liquid metal mixture obtained in step 2) into a mold to obtain an iron-based alloy;

[0177] 4) The iron-based alloy obtained in step 3) is placed in a mixed atmosphere of 60% butane + 40% air, carburized at 1100° C. for 8 h, and then isothermally quenched at 350° C. for 1 h to obtain the shear blade material.

[0178] The mechanical properties and wear resistance of the shear blade materials prepared in Examples 4 to 5 and Comparative Examples 11 to 15 were tested. The results of the mechanical properties and wear resistance tests are shown in Table 2.

[0179] Table 2 Mechanical properties and wear resistance test results

[0180]

[0181] It can be seen from the data in Table 2 that the Rockwell hardness of a shearing machine blade material provided by the present invention can reach HRC65, and the weight loss after 60 minutes of wear can reach 104 mg, and it has high mechanical properties and wear resistance; while the gas carbon source, time and temperature of the carburizing treatment will reduce the mechanical properties and wear resistance of the shearing machine blade material to a certain extent.

[0182] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A blade material for a shearing machine, characterized in that: Including the following chemical ingredients: Cr 5.0%~8.0%, Co 5.0%~8.0%, C 2.0%~3.0%, Mn 0.5%~1.5%, Ni 0.05%~0.1%, and the balance is Fe.

2. A method for preparing a shearing machine blade material as claimed in claim 1, characterized in that: The following steps are involved: 1) Weighing each raw material according to the chemical composition as claimed in claim 1; 2) mixing the raw materials weighed in step 1) and smelting them to obtain a molten liquid metal mixture; 3) pouring the molten liquid metal mixture obtained in step 2) into a mold to obtain an iron-based alloy; 4) placing the iron-based alloy obtained in step 3) in a carbon source gas and subjecting it to carburizing treatment to obtain the shear blade material.

3. A preparation method according to claim 2, characterized in that: In step 2), the smelting is specifically: smelting at 1300-1500° C. for 1-2 hours.

4. A preparation method according to claim 2, characterized in that: In step 4), the carbon source gas is specifically: 60% butane + 40% air.

5. A preparation method according to claim 2, characterized in that: In step 4), the carburizing treatment is specifically: carburizing at 800-1000° C. for 5-10 hours.

6. A preparation method according to claim 2, characterized in that: In step 4), after the carburizing treatment is completed, the iron-based alloy needs to be subjected to isothermal quenching treatment.

7. A preparation method according to claim 6, characterized in that: The isothermal quenching treatment is specifically: isothermal quenching treatment at 350° C. for 1 hour.

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