CN114248080A - Preparation method of twist drill and twist drill - Google Patents
Preparation method of twist drill and twist drill Download PDFInfo
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- CN114248080A CN114248080A CN202111606079.9A CN202111606079A CN114248080A CN 114248080 A CN114248080 A CN 114248080A CN 202111606079 A CN202111606079 A CN 202111606079A CN 114248080 A CN114248080 A CN 114248080A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/28—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools
- B23P15/32—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools twist-drills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B51/00—Tools for drilling machines
- B23B51/02—Twist drills
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/22—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for drills; for milling cutters; for machine cutting tools
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
Abstract
The application relates to the field of alloy preparation, and particularly discloses a twist drill and a preparation method thereof. The preparation method of the twist drill is simple to operate,easy to control and can realize batch production. The twist drill is prepared by the preparation method of the twist drill, the hardness of the cutting part in the twist drill is more than 50HRC, and the impact toughness is 120-140J/cm2(ii) a The hardness of the clamping part in the twist drill is 30-40HRC, and the impact toughness is 180J/cm2The above. In addition, the twist drill has higher wear resistance, can prolong the service life of the twist drill, reduces the waste of materials and meets the requirements of energy conservation and environmental protection.
Description
Technical Field
The application relates to the field of alloy preparation, in particular to a twist drill and a preparation method thereof.
Background
Twist drills are tools for machining holes from solid materials, and are one of the most widely used tools for machining holes. The twist drill is composed of a cutting portion, a guide portion and a clamping portion. The cutting part is responsible for the main cutting work and needs better wear resistance; the guide portion serves as a guide for the cutting portion after it has cut into the working hole and also as a backup portion for the cutting portion. The clamping part is used for transmitting torque, plays a role in supporting and needs good impact toughness.
At present, twist drills can be classified into approximately three categories: the first type is common, the twist drill is obtained by casting, processing and heat treatment, and the twist drill has the advantages of low price, simple process and the like, but the wear resistance of the twist drill is insufficient, and the service life of the twist drill is short. The second type is the cladding material class, and cladding material class fluted drill needs increase one deck cladding material (titanium, cobalt etc.) in cutting part and guide part, can increase fluted drill surperficial wearability, and along with the extension of live time, the cladding material is gradually worn away, directly leads to scrapping of fluted drill. The third type is hard alloy, and the hard alloy blocks are embedded in the contact part of the cutting part and the workpiece of the twist drill, so that the wear resistance of the twist drill can be improved; however, cemented carbide is expensive and has poor impact toughness. When the hard alloy twist drill is used, the hard alloy is easy to break, and the twist drill fails.
The application improves the preparation method of the twist drill on the basis of the common twist drill, and can increase the hardness, the wear resistance and the impact toughness of the twist drill, thereby prolonging the service life of the twist drill and avoiding the waste of materials.
Disclosure of Invention
In order to improve the hardness and impact toughness of the twist drill, the application provides a preparation method of the twist drill and the twist drill.
In a first aspect, the present application provides a method of making a twist drill, comprising the steps of,
s1: casting, namely smelting and casting the alloy raw materials to obtain an alloy ingot;
s2: forging, namely forging the alloy cast ingot to obtain a bar;
s3: rolling, namely performing primary rolling and secondary rolling on the bar to respectively obtain a primary blank and a secondary blank, wherein the heating temperature of the primary rolling and the secondary rolling is 900-;
s4: machining and forming, namely machining the secondary blank to obtain a twist drill semi-finished product, wherein the twist drill semi-finished product comprises a cutting part, a guiding part and a clamping part;
s5: and (3) performing heat treatment, namely heating the twist drill semi-finished product to 910-950 ℃, preserving heat for 0.5-1.5h, and then placing the cutting part and the guide part in a 280-300 ℃ salt bath furnace for preserving heat for 1-2h to obtain the twist drill.
In this application, five steps such as casting, forging, rolling, machine-shaping and thermal treatment need be passed through in the preparation of fluted drill, can improve fluted drill's hardness and impact toughness, and then improve fluted drill's wearability, prolong fluted drill's live time, reduce the waste of material, reach energy-concerving and environment-protective purpose. The twist drill prepared by the application is mainly used under the condition that the use environment is severe, for example, in the drilling of concrete, red brick walls and metal.
In the casting process, a method of high-temperature tapping and low-temperature casting is adopted. Firstly, adding alloy raw materials into an induction furnace for smelting to form molten iron, and detecting chemical components of the molten iron when the smelting temperature reaches 1570-; and discharging the molten iron after the chemical components of the molten iron are qualified, pouring the molten iron into a mold when the temperature is reduced to 1430-1470 ℃, and cooling to room temperature to obtain an alloy ingot.
When the smelting temperature is lower than 1570 ℃, the alloy raw material with high melting point can not be completely melted; when the smelting temperature is higher than 1600 ℃, the burning loss of the alloy raw material with low melting point is serious, and the material waste is caused. When the pouring temperature is higher than 1470 ℃, the problem of 'gas coiling' can occur, so that a large amount of shrinkage cavities and shrinkage porosity exist in the alloy cast ingot, and the impact toughness of the twist drill is further influenced; when the casting temperature is lower than 1430 ℃, the fluidity of the molten iron is affected.
In a specific embodiment, the temperature of the melting is 1590 ℃ and the temperature of the pouring is 1450 ℃.
Preferably, the alloy ingot comprises the following components in percentage by weight: 0.50-0.60%, Cr: 1.86-2.01%, Mn: 2.1-2.4%, Mo: 0.2-0.27%, Cu: 0.2-0.3%, Ni: 0.2-0.25%, Si: 1.1-1.25%, Al: 1.0-1.3%, P is less than or equal to 0.03%, S is less than or equal to 0.002%.
In the casting process, the alloy raw materials are as follows: 0.50-0.60%, Cr: 1.86-2.01%, Mn: 2.1-2.4%, Mo: 0.2-0.27%, Cu: 0.2-0.3%, Ni: 0.2-0.25%, Si: 1.1-1.25%, Al: 1.0-1.3 percent of elements, less than or equal to 0.03 percent of P, less than or equal to 0.002 percent of S and the like, and smelting and casting to obtain the alloy ingot. The carbon content in the alloy cast ingot is 0.50-0.60%, the alloy cast ingot belongs to the range of medium carbon steel, and the hardenability of the twist drill can be improved by adding other elements, so that the hardness and the impact toughness of the twist drill are improved.
In the forging process, the alloy ingot is heated to 950 ℃ and 1000 ℃, and then free forging is carried out on a forging machine to obtain the bar. After the alloy cast ingot is forged, the size of the alloy cast ingot can be changed, the grain structure in the alloy cast ingot is refined, the number of shrinkage cavities and shrinkage porosity is reduced, and the hardness and impact toughness of the twist drill are further improved. The deformation of the alloy ingot is 45-65%, the cracking of the alloy ingot is small in the deformation range, and the core structure of the alloy ingot is refined.
In the application, the alloy ingot casting obtains the bar after forging, carries out rolling treatment with the bar again, further refines the inside tissue of bar, improves the impact toughness and the hardness of bar. The rolling process comprises primary rolling and secondary rolling. Along with the increase of the rolling times, the structure in the bar is gradually thinned, and the mechanical property is also gradually improved; however, the increase of the rolling times inevitably leads to the reduction of the working efficiency, and the performance and the cost of the bar cannot be correspondingly matched. Therefore, in the present application, the rolling is preferably performed twice.
The heating temperature of the primary rolling and the secondary rolling is 900-1020 ℃; when the heating temperature is higher than 1020 ℃, the structure in the bar gradually grows up, so that the mechanical property of the bar is reduced; when the heating temperature is lower than 900 ℃, the temperature of the bar is low, which is not beneficial to the deformation of the bar and increases the risk of the cracking of the bar.
Preferably, the heating temperature of the primary rolling and the secondary rolling is 940-.
Further preferably, the heating temperature of the primary rolling is 950 ℃ and the heating temperature of the secondary rolling is 980 ℃. After the bar is rolled for one time, the diameter of the bar is reduced, and the cooling rate is improved. Therefore, the heating temperature of the secondary rolling is higher than that of the primary rolling, and the deformation and the structure refinement of the bar are facilitated in the secondary rolling process.
The deformation of the primary rolling and the secondary rolling is also an important factor in the rolling process; when the deformation is higher than 50%, the production efficiency can be improved, the structure inside the bar can be refined, but when the deformation is gradually increased from 50%, the cracking property of the bar is increased, irreparable damage is caused, and the bar is directly scrapped. When the amount of deformation is less than 33%, although the cracking of the bar can be reduced, the rolling speed is reduced, resulting in a reduction in production efficiency; as the amount of deformation gradually decreases from 33%, the deformation distance from the surface to the center of the rod gradually decreases, that is, after the rod is rolled, only the structure of the surface of the rod can be refined, and the hardness and impact toughness of the rod cannot be effectively improved.
Preferably, the primary rolling and the secondary rolling have a deformation amount of 35 to 45%.
More preferably, the primary rolling deformation amount is 45% and the secondary rolling deformation amount is 40%. In the present application, the deformation amount in the primary rolling is larger than that in the secondary rolling. The deformation amount is large in the primary rolling, the structure of the core part of the bar can be refined, and the deformation amount is small in the secondary rolling, and the structure of the surface of the bar can be refined. After the bar is subjected to primary rolling and secondary rolling, the hardness and impact toughness of the bar are improved, and the wear resistance of the bar is improved.
The alloy raw material is cast, forged and rolled to obtain a secondary blank. And (4) processing and forming the secondary blank according to the models of different products to obtain a twist drill semi-finished product. The twist drill semi-finished product includes a cutting portion, a guide portion and a clamping portion. The cutting portion mainly functions to cut a drilled hole and requires high wear resistance. The guide part is a spiral guide groove formed on the cutting part and can guide the waste in the hole out. The clamping part mainly plays a connecting role, one end of the clamping part is fixedly connected to the cutting part, the other end of the clamping part is clamped on the machine equipment, the clamping part is driven to rotate through high-speed rotation of the machine equipment, and then the cutting part and the guide part continuously rotate, so that the aim of cutting and drilling empty is achieved.
In the application, the twist drill semi-finished products with different models are prepared after machining and forming, and the twist drill is prepared after heat treatment. Firstly, heating the twist drill semi-finished product in a heating furnace to 910-. Then placing the cutting part and the guiding part in the heated twist drill semi-finished product in a salt bath furnace at the temperature of 280-300 ℃, and preserving the heat for 1-2h at the temperature; naturally cooling the clamping part in the twist drill semi-finished product in the air; and finally, placing the cutting part and the guide part in the salt bath furnace in the air for natural cooling, and cooling the whole semi-finished product of the twist drill to obtain the twist drill.
The twist drill is prepared by carrying out heat treatment on the semi-finished product of the twist drill and can be directly used. The structure of the twist drill within the cutting and pilot portions includes a significant amount of lower bainite, as well as a portion of the retained austenite and martensite. The cutting portion and the guiding portion have a high hardness and impact toughness.
In a specific embodiment, the heating temperature in the heat treatment step is 930 ℃, and the holding time is 1.0 h; the temperature in the salt bath furnace is 290 ℃, and the heat preservation time is 1.5 h.
In a second aspect, the present application provides a twist drill. The twist drill is prepared by the preparation method of the twist drill.
Preferably, the hardness of the cutting part of the twist drill is more than 50HRC, and the impact toughness is 120-140J/cm2The above; the clamping part of the twist drill has the hardness of 30-40HRC and the impact toughness of 180J/cm2The above.
In the application, alloy raw materials are mixed according to predetermined chemical components, melted into molten iron at the melting temperature of 1570-; then the alloy cast ingot is freely forged on a forging machine, and the core structure of the alloy cast ingot is mainly refined to prepare a bar; rolling the bar material on a rolling mill for two times, wherein the bar material is rolled for one time to obtain a primary blank, the heating temperature of the primary rolling is 900-1020 ℃, and the deformation of the primary rolling is 33-50%; then, carrying out secondary rolling on the primary blank to obtain a secondary blank, wherein the heating temperature of the secondary rolling is 900-1020 ℃, and the deformation amount of the secondary rolling is 33-50%; after the bar is rolled, the structures of the core and the surface of the bar are thinned, and the hardness and the impact toughness of the bar are improved, namely the hardness and the impact toughness of the twist drill are improved.
And processing and forming the secondary blank according to different models to prepare a twist drill semi-finished product. Finally, heating the twist drill semi-finished product to 910-; and naturally cooling the clamping part in the air to obtain the twist drill. The hardness of the cutting part of the twist drill is more than 50HRC, and the impact toughness is 120-140J/cm2The above; the clamping part of the twist drill has the hardness of 30-40HRC and the impact toughness of 180J/cm2The above.
In summary, the present application has the following beneficial effects:
1. the method has the advantages that the preparation combining casting, forging, rolling, machining and forming and heat treatment is adopted, so that the hardness and impact toughness of the twist drill can be improved, the wear resistance of the twist drill is further improved, the service life of the twist drill is prolonged, the waste of materials is reduced, and the energy-saving and environment-friendly requirements are met;
2. the preparation method is simple to operate, easy to control and capable of achieving batch production;
3. the hardness of the cutting part in the twist drill is more than 50HRC, and the impact toughness is 120-140J/cm2；
4. The hardness of the clamping part in the twist drill is 30-40HRC, and the impact toughness is 180J/cm2The above.
Drawings
FIG. 1 is a schematic view of a twist drill;
FIG. 2 is a schematic view of a twist drill in a salt bath furnace;
in the figure, 1, cutting part; 2. a guide portion; 3. a clamping portion; 4. salt bath furnace.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples.
Examples
Example 1
S1: casting, wherein the chemical elements are as follows: 0.55 wt%, Cr: 1.9 wt%, Mn: 2.2 wt%, Mo: 0.2 wt%, Cu: 0.25 wt%, Ni: 0.22 wt%, Si: 1.1 wt%, Al: 1.2 wt%, P less than or equal to 0.03 wt% and S less than or equal to 0.002 wt% to prepare alloy raw materials; adding alloy raw materials into an induction furnace to be smelted into molten iron, and stopping heating when the smelting temperature reaches 1590 ℃; when the temperature is gradually reduced to 1450 ℃, molten iron is poured into the mold, and an alloy ingot with the diameter of 200mm is obtained after the molten iron is cooled to the room temperature.
S2: forging, namely placing the alloy ingot into a heating furnace to heat to 980 ℃, and then placing the alloy ingot on a forging machine to carry out free forging to obtain a bar material with the diameter of phi 100mm (the deformation is 50%); then the bar with the diameter of phi 100mm is put into a heating furnace to be heated to 990 ℃, and then the bar is placed on a forging machine to be freely forged again, so that the bar with the diameter of phi 50mm (the deformation is 50%) is obtained.
S3: rolling, namely putting a bar with the diameter of phi 50mm into a heating furnace to heat to 950 ℃, then putting the bar into a rolling mill to perform primary rolling to obtain a primary blank with the diameter of phi 27.5mm (the deformation is 45%), putting the primary blank with the diameter of phi 27.5mm into the heating furnace to heat to 980 ℃, then putting the primary blank into the rolling mill to perform secondary rolling, and obtaining a secondary blank with the diameter of phi 16.5mm (the deformation is 40%) after the secondary rolling.
S4: and (4) machining and forming, namely machining the secondary blank to prepare a twist drill semi-finished product with the diameter of phi 14 mm. As shown in fig. 1, the twist drill semi-finished product is composed of a cutting portion 1, a guide portion 2 and a holding portion 3.
S5, performing heat treatment, namely putting the twist drill semi-finished product into a heating furnace to be heated to 930 ℃, and preserving heat for 1.0h at the temperature; after being taken out, the cutting part 1 and the guide part 2 in the twist drill semi-finished product are placed in a salt bath furnace 4 (shown in figure 2), the temperature in the salt bath furnace 4 is 290 ℃, and the temperature is kept for 1.5 hours at the temperature; and (3) placing the clamping part 3 in the semi-finished product of the twist drill in the air for natural cooling to prepare the twist drill.
The parameters for distinguishing examples 2-12 from example 1 are shown in Table 1.
Table 1 parameters distinguishing examples 2-12 from example 1
Comparative example
The parameters for distinguishing comparative examples 1 to 7 from example 1 are shown in Table 2.
TABLE 2 parameters distinguishing comparative examples 1 to 7 from example 1
Comparative example 8
Comparative example 8 is different from example 1 in that comparative example 8 does not include step S2. After the alloy raw material is subjected to step S1 (casting), an alloy ingot with the diameter of phi 50mm is prepared.
Comparative example 9
Comparative example 9 is different from example 1 in that comparative example 9 does not include step S3. After multiple times of forging, a bar with the diameter of phi 20mm is obtained, and then the bar is processed and formed.
Comparative example 10
The difference between the comparative example 10 and the example 1 is that in the comparative example 10, the twist drill semi-finished product is placed into a heating furnace to be heated to 930 ℃, and the temperature is kept for 1.0 h; taking out, and putting the twist drill semi-finished product into water for quenching.
Performance test
Firstly, component determination of alloy cast ingot
Samples were taken from the alloy ingots prepared in examples 1 to 7 and comparative examples 1 to 10, and the elements and contents of the alloy ingots were measured by wet chemical method or spectrochemical method according to ASTM E354 standard, and the results are shown in Table 3.
TABLE 3 EXAMPLES 1-7 AND COMPARATIVE EXAMPLES 1-10 alloy ingot chemistry (wt%)
| Categories | C | Cr | Mn | Mo | Cu | Ni |
| Content (wt.) | 0.552 | 1.92 | 2.25 | 0.231 | 0.249 | 0.221 |
| Categories | Si | Al | P | S | Fe | |
| Content (wt.) | 1.094 | 1.202 | 0.01 | 0.001 | Balance of |
Examples 1 to 7 and comparative examples 1 to 10 are alloy ingots cast from the same molten iron.
Second, mechanical property test
The twist drills prepared in examples 1 to 7 and comparative examples 1 to 10 were tested for hardness and impact toughness, and the hardness and impact toughness were measured 5 times and averaged. The results are shown in Table 4.
TABLE 4 test results
As can be seen by combining examples 1-7 with Table 4, the hardness of the cutting part in the twist drill was above 50HRC, and the impact toughness was 120-140J/cm2(ii) a The hardness of the clamping part in the twist drill is 30-40HRC, and the impact toughness is 180J/cm2The above. In particular, the twist drill prepared in example 1, was cutThe part hardness is 62.2HRC, and the impact toughness is 139.7J/cm2(ii) a The hardness of the clamping part in the twist drill is 35.1HRC, and the impact toughness is 192.9J/cm2。
As can be seen by combining example 1 and comparative example 8 with table 4, comparative example 8 did not employ forging to produce a twist drill having poor hardness and impact toughness.
As can be seen by combining example 1 and comparative example 9 in combination with table 4, comparative example 9 did not use rolling to prepare a twist drill, which was inferior in hardness and impact toughness.
As can be seen by combining example 1 and comparative example 10 and table 4, in comparative example 10, the heated twist drill semi-finished product was directly put into water for quenching to obtain a twist drill, and although the hardness of the cutting portion in the twist drill satisfied the requirement, the impact toughness of the cutting portion was poor; in addition, the impact toughness of the clamping portion of the twist drill is also poor.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (8)
1. A preparation method of a twist drill is characterized by comprising the following steps,
s1: casting, namely smelting and casting the alloy raw materials to obtain an alloy ingot;
s2: forging, namely forging the alloy cast ingot to obtain a bar;
s3: rolling, namely performing primary rolling and secondary rolling on the bar to respectively obtain a primary blank and a secondary blank, wherein the heating temperature of the primary rolling and the secondary rolling is 900-;
s4: machining and forming, namely machining the secondary blank to obtain a twist drill semi-finished product, wherein the twist drill semi-finished product comprises a cutting part, a guiding part and a clamping part;
s5: and (3) performing heat treatment, namely heating the twist drill semi-finished product to 910-950 ℃, preserving heat for 0.5-1.5h, and then placing the cutting part and the guide part in a 280-300 ℃ salt bath furnace for preserving heat for 1-2h to obtain the twist drill.
2. The method of making a twist drill according to claim 1, wherein the alloy ingot comprises, in weight percent, C: 0.50-0.60%, Cr: 1.86-2.01%, Mn: 2.1-2.4%, Mo: 0.2-0.27%, Cu: 0.2-0.3%, Ni: 0.2-0.25%, Si: 1.1-1.25%, Al: 1.0-1.3%, P is less than or equal to 0.03%, S is less than or equal to 0.002%.
3. The method of preparing a twist drill according to claim 1, wherein the heating temperature of the primary rolling and the secondary rolling is 940-1000 ℃, and the deformation amount of the primary rolling and the secondary rolling is 35-45%.
4. The method of making twist drills according to claim 3, wherein the heating temperature of the primary rolling is 950 ℃ and the heating temperature of the secondary rolling is 980 ℃.
5. The method of making a twist drill according to claim 3, wherein the deflection of the primary rolling is 45% and the deflection of the secondary rolling is 40%.
6. The method for preparing a twist drill according to claim 1, wherein the heating temperature in the heat treatment step is 930 ℃, and the holding time is 1.0 h; the temperature in the salt bath furnace is 290 ℃, and the heat preservation time is 1.5 h.
7. A twist drill, characterized in that it is produced by the method of producing a twist drill according to any one of claims 1 to 6.
8. The twist drill of claim 1, wherein the drill bit is a drill bitThe hardness of the cutting part of the twist drill is more than 50HRC, and the impact toughness is 120-140J/cm2(ii) a The hardness of the clamping part of the twist drill is 30-40HRC, and the impact toughness is 180J/cm2The above.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN112080704A (en) * | 2020-09-27 | 2020-12-15 | 天津钢研海德科技有限公司 | High-toughness high-hardness cold and hot combined type die steel and preparation method thereof |
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| CN114248080B (en) | 2022-09-23 |
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