Manufacturing process method of bimetal composite cutting edge tool

Abstract

The invention discloses a manufacturing process method of a bimetal composite cutting edge tool. The manufacturing process method comprises the following steps that S1, a bimetal composite die steel mortise and tenon joint structure is manufactured; s2, manufacturing a sheath structure; s3, the whole sheath structure manufactured in the step S2 is heated while vacuumizing is conducted through an exhaust pipe till the temperature reaches 600 DEG C, vacuumizing operation is kept while heating is conducted till the internal pressure reaches 5 * 10 <-4 > Pa, and then the exhaust pipe is welded and plugged; s4, further slowly heating the bimetal composite die steel vacuumized in the step S3 to 1150-1160 DEG C, wherein the whole heating process lasts for 8-10 hours; s5, hot rolling to obtain a finished product; and S6, the bimetal composite die steel obtained after hot rolling and calendering in the step S5 is sheared according to the size of the tool, finishing is conducted, and the bimetal cutting edge tool is obtained. According to the technological method, the double-metal-cutting-edge tool is manufactured through a new method, the overall price cost of the manufactured tool is greatly reduced compared with a tool manufactured through a traditional mode, and the performance is not affected.

Description

Technical Field

[0001] This invention relates to the field of high-end equipment manufacturing technology, and in particular to a manufacturing process for a bimetallic composite cutting edge tool. Background Technology

[0002] During the cutting process, the hardness and toughness of cutting tool and tool materials are two important parameters. Currently, common cutting tool and tool materials are mainly high-speed steel, cemented carbide, ceramic materials, PCBN (cubic boron nitride), or PCD (polycrystalline diamond). Because ceramic materials, diamond, and cubic boron nitride have poor toughness and high hardness, mold steels that combine two materials have been developed for use in cutting tools and tools in order to balance the hardness and toughness of cutting tool and tool materials. However, many existing composite mold steels currently use adhesives to bond two different metals together. The reliability of the bonding varies with the strength of the adhesive, which can significantly affect the service life of the cutting tool.

[0003] Chinese invention patent publication number CN115747792 A discloses a laser cladding composite material, laser cladding equipment, and a method for preparing the material. It discloses the use of cold-rolled carbon structural steel as the matrix material, with a CuSn8Ni alloy coating laser-clad onto the surface of the matrix material. This laser cladding method produces a lead-free tin bronze alloy CuSn8Ni / steel bimetallic composite material with low porosity, high hardness, and high bonding strength. This composite material can be used to manufacture high-performance heavy-duty diesel engine bearings. While this patented technology uses laser cladding to bond the two materials together, the laser cladding method has drawbacks such as easy detachment of the composite layer, high cost, a yield rate of only 90%, and a composite strength of only 50%. More importantly, the die steel currently used for cutting tools and knives uses the same material for both the cutting edge and the handle. The cutting edge requires high hardness, while the handle requires high toughness, with less stringent hardness requirements. This results in an inability to effectively coordinate the performance of the two materials. Furthermore, the market price of cutting edge material is generally as high as 20,000 yuan per ton, while the price of ordinary material for the handle is only 4,000 yuan per ton. Therefore, relatively ordinary knives are expensive because they are currently made using the same cutting edge material, which inadvertently increases the overall production cost of knives. Summary of the Invention

[0004] The purpose of this invention is to address the above-mentioned issues by providing a manufacturing process for bimetallic composite cutting edge tools. This process employs a novel method to manufacture bimetallic cutting edge tools, resulting in a significantly lower overall cost compared to tools manufactured using traditional methods, without compromising performance.

[0005] The specific solution of this invention is: a manufacturing process for a bimetallic composite cutting edge tool, comprising the following steps:

[0006] S1. Fabrication of bimetallic composite mold steel tenon and mortise structure: The tenon and mortise structure is composed of base mold steel and blade mold steel. The base mold steel has a female groove with a cross-section of upright trapezoidal along the length direction. The cross-section of the blade mold steel is also trapezoidal and matches the female groove. The blade mold steel is inserted into the female groove to form the bimetallic composite mold steel with tenon and mortise structure.

[0007] S2. Making the encasing structure: First, weld a sealing steel plate to each end of the tenon structure. The sealing steel plate is welded to the outer port of the mother groove and seals it. A steel pipe is also connected to the sealing steel plate. The air extraction pipe is connected to the gap inside the mother groove. At the same time, the upper port of the mother groove is welded and sealed to the blade mold steel and the sealing steel plate respectively.

[0008] S3. While heating the entire casing structure produced in step S2, simultaneously evacuate the vacuum through a vacuum pipe until the temperature reaches 600°C. Continue evacuation during heating until the internal pressure reaches 5 × 10⁻⁶. -4 Pa, then melt and seal the extraction pipe;

[0009] S4. The bimetallic composite mold steel that was vacuumed in step S3 is further slowly heated to 1150-1160°C. The entire heating process lasts for 8-10 hours.

[0010] S5. Hot rolling: The bimetallic composite die steel billet heated in step S4 is fed into the rolling mill and hot rolling and pressing process is adopted to produce the product in multiple passes until it is rolled into the required specifications and dimensions.

[0011] S6. The bimetallic composite die steel obtained by hot rolling in step S5 is cut and finished according to the required tool size to obtain a bimetallic cutting edge tool.

[0012] Furthermore, the base mold steel material mentioned in this invention is any one of 1.2311 steel, Q235 steel, and 45# structural steel; the blade mold steel material is any one of 5H12 powder mold steel, 6542 powder high-speed steel, and a8b powder mold steel; the sealing steel plate and the material used for welding the upper port perimeter of the mother groove to the blade mold steel include any one of 304 stainless steel, EDPCrMo-A4-03, and Cr5MoV.

[0013] Furthermore, the rolling mill in step S5 of this invention is a reversible rolling mill.

[0014] Furthermore, the base mold steel described in this invention has a width and height of 480mm and 120mm before rolling, and a width and height of 460mm and 20mm after rolling, respectively.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] (1) Compared with the prior art, the bimetallic composite mold steel obtained by the present invention, under the premise of unchanged performance, only accounts for a small part of the entire cutting tool material, about 1 / 10 to 1 / 8. The cost of the entire cutting tool material is reduced by about 90%, the processing cost is reduced by 40 to 50%, and the overall cost is reduced by 50 to 60%, which creates very good economic benefits for enterprises.

[0017] (2) The bimetallic composite in this invention is physical composite without the use of adhesive. Before rolling, a tenon and mortise structure is used, that is, a vertical trapezoidal groove is opened on the base mold steel, and the blade mold steel is also a trapezoidal structure inserted into the groove. Since the trapezoidal structures are interlocked to form a tenon and mortise structure, the composite is more compact. In addition, the gaps inside are vacuumed more tightly before rolling, which greatly improves the vacuum degree. Thus, the composite degree of the two metals is higher, tighter, and more stable. Finally, the bimetallic composite steel is rolled into shape in one piece, with good composite strength and higher working surface material grade, which is suitable for mass production.

[0018] (3) The bimetallic composite steel of the present invention can be made into cutting tools and blades with only simple processing in the later stage, which reduces various other processing processes and reduces production costs for downstream customers.

[0019] (4) In the process of the present invention, the interior of the mortise and tenon structure is vacuumed and the entire workpiece is heated to 600°C during the vacuuming process, which causes the gas in the internal gap to almost completely dissipate. This makes the two metals more tightly bonded during the subsequent rolling process, and the service life of the cutting tools will be longer and the performance will be better. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the bimetallic composite die steel before integral rolling in this invention;

[0021] Figure 2 This is a schematic diagram of the main view structure of the base mold steel and the blade mold steel together in this invention;

[0022] Figure 3 yes Figure 2 A top-view structural diagram;

[0023] Figure 4 This is a schematic diagram of a cutting tool that has been rolled and calendered to cut into two halves.

[0024] In the figure: 1—weld, 2—base mold steel, 3—blade mold steel, 4—sealing steel plate, 5—evacuation pipe, 6—mother groove, 7—blade back plate base, 8—blade. Detailed Implementation

[0025] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention. In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," etc., indicating orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use. They are only for the convenience of describing the present invention or simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0026] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] See Figures 1-3 This invention relates to a manufacturing process for a bimetallic composite cutting edge tool, comprising the following steps:

[0028] S1. Fabrication of bimetallic composite mold steel tenon and mortise structure: The tenon and mortise structure is composed of base mold steel 2 and blade mold steel 3. The base mold steel has a female groove 6 with a cross-section of upright trapezoidal along the length direction. The cross-section of the blade mold steel is also trapezoidal and matches the female groove. The blade mold steel is inserted into the female groove to form a bimetallic composite mold steel with a tenon and mortise structure.

[0029] S2. Fabrication of the Encasing Structure: First, weld a sealing steel plate 4 to each end of the tenon and mortise structure. This sealing steel plate is welded to the outer port of the mother groove and seals it. A suction pipe 5 made of steel tubing is also connected to the sealing steel plate, communicating with the gap inside the mother groove. Simultaneously, the upper port of the mother groove is welded and sealed to the cutting die steel and the sealing steel plate at its four edges. Figure 1 Weld 1 shown;

[0030] S3. While heating the entire casing structure produced in step S2, simultaneously evacuate the vacuum through a vacuum pipe until the temperature reaches 600°C. Continue evacuation during heating until the internal pressure reaches 5 × 10⁻⁶. -4 Pa, then melt and seal the extraction pipe;

[0031] S4. The bimetallic composite mold steel that was vacuumed in step S3 is further slowly heated to 1150-1160°C. The entire heating process lasts for 8-10 hours.

[0032] S5. Hot Rolling: The bimetallic composite die steel billet heated in step S4 is fed into a rolling mill and subjected to a hot rolling process with light rolling and pressing in multiple passes until it reaches the required specifications and dimensions. Furthermore, the rolling mill in step S5 of this invention is a reversible rolling mill. Further, the width and height of the base die steel before rolling are 480mm and 120mm respectively, and the width and height after rolling are 460mm and 20mm respectively.

[0033] S6. The bimetallic composite die steel produced by hot rolling in step S5 is sheared and finished according to the required tool size to obtain a bimetallic cutting edge tool. The sheared cutting edge tool is shown in the attached figure. Figure 4 The blade body consists of a back plate substrate 7 and a blade 8, which is the final product for application.

[0034] Furthermore, in this embodiment, the base mold steel material is any one of 1.2311 steel, Q235 steel, and 45# structural steel; the blade mold steel material is any one of 5H12 powder mold steel, 6542 powder high-speed steel, and a8b powder mold steel; the sealing steel plate and the material used for welding the upper port of the mother groove to the blade mold steel include any one of 304 stainless steel, EDPCrMo-A4-03, and Cr5MoV.

[0035] The specific fabrication of a bimetallic cutting tool according to this embodiment is described below, using 1.2311 steel as the base material and 5H12 die steel as the cutting edge material, and includes the following steps:

[0036] (1) Hot rolling: Heat 1.2311 steel to 1150-1180 ℃, the thickness of hot rolling billet is 90-150 mm, the width depends on the product specifications, and leave 30 mm for secondary rolling; control the initial rolling temperature of 5H12 die steel to 1050-1100 ℃, and the final rolling temperature to 850-900 ℃;

[0037] (2) Finishing: After the above-treated 1.2311 steel and 5H12 mold steel are fully annealed according to the standard process, they are sent to shot blasting machine to remove the surface oxide scale. After shot blasting, the surface cracks and pits are polished by grinding wheel to remove surface cracks, folds and pits. Finally, the steel is sawn according to the process requirements, with one end sawn evenly and the sawing line is accurately marked to ensure the sawing length.

[0038] (3) Milling the mother groove and making bimetallic composite steel: Keep the outer surface of 1.2311 steel and 5H12 mold steel clean and smooth. According to the process drawings and specifications, the gap is matched. First, the middle part of 1.2311 steel is milled to form the mother groove of the required size. At the same time, the 5H12 mold steel is milled to form a trapezoidal surface that matches the mother groove to ensure milling accuracy. The cutting edge mold steel 3 made of 5H12 mold steel and the base mold steel 2 made of 1.2311 steel are tightly inserted into each other to form a whole, and a bimetallic composite steel billet is obtained.

[0039] (4) Vacuum treatment: The two ends of the obtained bimetallic composite steel billet are sealed by welding with sealing steel plates. Then, welds are simultaneously welded to the upper edges of the blade die steel and the base die steel to form welds. Finally, the vacuum inside the mother tank is evacuated through the air extraction pipe opened on the sealing steel plate until the pressure reaches 5×10. -4 Pa, by drawing a vacuum, the gas between the cutting edge die steel and the base die steel can be almost completely extracted, avoiding the phenomenon of inclusion and gas trapping at the composite interface between the two, thus giving them better physical composite properties.

[0040] (5) Hot rolling: The obtained bimetallic composite steel billet is heated to 1100-1150 ℃, and hot rolling is carried out using a reversible rolling mill with a rolling pressure of less than 750 t. The billet is rolled multiple times until the reduction is less than 10% of the billet thickness. The composite steel billet is then placed in the furnace again for reheating. The furnace temperature is 1150 ℃. Finally, it is rolled into the required specifications and dimensions.

[0041] (6) Finishing: The rolled bimetallic composite steel is annealed and shot blasted. After annealing according to the normal process temperature curve, it is sent to the shot blasting machine to completely remove the surface oxide scale. After shot blasting, the surface cracks and pits are polished by grinding with a grinding wheel. The surface cracks, folds and pits are removed. The steel is then sawn to the required length according to the process requirements, with one end cut evenly. The sawing length is accurately marked.

[0042] The bimetallic composite mold steel prepared in this embodiment was subjected to crystal phase detection. The microstructure at the junction of the two metals was uniform, and the bonding depth of the two metals reached 64μm. The ultrasonic non-destructive testing was passed, and there was basically no waveform loss. Taking the domestically produced 5H12 cutting edge material in this embodiment as an example, its market price is approximately 15,000-18,000 yuan / ton. The base material, 1.2311 steel, has a market price of approximately 4,000 yuan / ton. The manufacturing dimensions are 300mm*145mm*17mm, and the weight is 5.805kg of composite steel. The cutting edge material used has dimensions of 300mm*50mm*5mm and a weight of 0.588 kg. The company's cost is 0.588*15,000 + (5.805-0.588)*4,000 = 29.688 yuan. However, the cost of a knife made entirely from the cutting edge material is 5.805*15,000 = 87.075 yuan. The cost savings are 87.075 - 29.688 = 57.387 yuan, representing a 65.9% reduction in material costs. This is a significant achievement for cost reduction and efficiency improvement for relevant enterprises.

[0043] According to the national standard GB-T1299-2014, the hardness is based on the Rockwell hardness section of GB / T 230.1, and the depth of the composite joint is based on the section of GB / T 224. The bimetallic composite steel prepared in this embodiment was tested for hardness and the depth of the composite joint, and both met the relevant requirements.

[0044] Of course, the above embodiments are only one implementation method, and the cutting edge material and the base material can be selected according to actual needs.

[0045] Compared with the prior art, the bimetallic composite mold steel obtained by this invention, under the premise of unchanged performance, only accounts for a small part of the entire cutting tool material, about 1 / 10 to 1 / 8. The overall material cost of the cutting tool is reduced by about 90%, the processing cost is reduced by 40 to 50%, and the comprehensive cost is reduced by 50 to 60%, creating very good economic benefits for enterprises.

[0046] The bimetallic composite in this invention is physically bonded without the use of adhesives. Before rolling, a mortise and tenon structure is used, where a trapezoidal groove is opened on the base die steel, and the cutting edge die steel is also a trapezoidal structure inserted into the groove. Because the trapezoidal structures are interlocked to form a mortise and tenon structure, the composite is more compact. In addition, the gaps inside are subjected to a more rigorous vacuum treatment before rolling, which greatly improves the vacuum degree. This results in a higher degree of bonding between the two metals, making it more compact and stable. Finally, the bimetallic composite steel is rolled into a single piece, with good composite strength and a higher grade of working surface material, making it suitable for mass production.

[0047] The bimetallic composite steel of this invention only requires simple processing in the later stage to be made into cutting tools, reducing various other processing techniques and lowering production costs for downstream customers.

[0048] In the process of this invention, the interior of the mortise and tenon structure is vacuumed, and the entire workpiece is heated to 600°C during the vacuuming process, causing the gas in the internal gaps to almost completely dissipate. This results in a tighter bonding between the two metals during the subsequent rolling process, and also extends the service life and improves the performance of the cutting tools.

Claims

1. A manufacturing process for a bimetallic composite cutting edge tool, characterized in that, The method comprises the following steps: S1, making a double-metal composite die steel mortise and tenon structure: the mortise and tenon structure is composed of a base die steel and a blade die steel, the base die steel is provided with a female groove with a cross section of a vertical trapezoid along a length direction, and the cross section of the blade die steel is also a trapezoid and matches the female groove, the blade die steel is inserted into the female groove to form a double-metal composite die steel of the mortise and tenon structure; S2, making a cladding structure: welding a sealing steel plate at each end of the mortise and tenon structure, the sealing steel plate is welded at an outer port of the female groove and seals the outer port, the sealing steel plate is further connected with an air extraction pipe made of a steel pipe, the air extraction pipe is connected with a gap in the female groove, and the upper port of the female groove is welded and sealed with the blade die steel and the sealing steel plate at the edges of the upper port; S3, the package structure made in step S2 is heated and vacuumed through the vacuum pipe until it reaches 600°C, and the vacuuming is kept while heating until the internal pressure reaches 5 x 10 -4 Pa, and then the vacuum pipe is welded and sealed; S4, further slowly heating the double-metal composite die steel after the vacuumizing in step S3 to 1150-1160℃, and the whole heating process lasts for 8-10 hours; S5, hot rolling: feeding the double-metal composite die steel after the heating in step S4 into a rolling mill, and adopting a hot rolling process to lightly roll and press, and forming a product in multiple passes until the product with a required size is rolled; S6, shearing and finishing the double-metal composite die steel after the hot rolling in step S5 according to a required tool size to obtain a double-metal blade tool.

2. The process of making a dual metal composite edge knife according to claim 1, wherein, The base die steel material is any one of 1.2311 steel, Q235 steel and 45# structural steel, the blade die steel material is any one of 5H12 powder die steel, 6542 powder high-speed steel and a8b powder die steel, the sealing steel plate and the material for welding the blade die steel at the edges of the upper port of the female groove comprise any one of 304 stainless steel, EDPCrMo-A4-03 and Cr5MoV.

3. The process of making a dual metal composite edge knife according to claim 1, wherein, The rolling mill in step S5 is a reversible rolling mill.

4. The process of making a dual metal composite edge knife according to claim 1, wherein, The width and height of the base die steel before rolling are 480mm and 120mm respectively, and the width and height after rolling are 460mm and 20mm respectively.

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