Iron-based binding agent honing abrasive strip and preparation method thereof

Abstract

The invention provides an iron-based binding agent honing abrasive bar. The iron-based binding agent honing abrasive bar is composed of the following raw materials of, by mass, 40%-60% of iron powder, 10%-30% of copper powder, 3%-15% of tin powder, 2%-15% of nickel powder, 1%-10% of tungsten carbide powder, 0.1%-5% of cerium oxide, 0.5%-5% of additives and the balance cubic boron nitride. The formula of the binding agent with the iron powder as the main body is adopted, the defects that an existing copper-based binding agent abrasive bar is short in service life and high in cost are overcome, and the honing abrasive bar has the advantages of being long in service life, good in machining quality and low in cost. The iron powder is non-toxic, and the binding agent with the iron powder as the main body can protect the health of a sand bar maker to the maximum extent. The iron-based binding agent honing abrasive strip can improve the qualified rate of reticulate patterns of a cylinder sleeve, optimize the oil storage and lubrication functions, reduce the risk of cylinder scoring and prolong the service life of an engine. Meanwhile, the phenomenon of engine oil burning can be reduced through the good reticulate patterns, emission of particulate matter and hydrocarbon is reduced, and then the environment is protected.

Description

Technical Field

[0001] This invention belongs to the field of abrasive technology, specifically relating to an iron-based bonded honing abrasive strip and its preparation method. Background Technology

[0002] Honing is a crucial process in engine cylinder liner manufacturing, and its quality directly affects engine fuel consumption, emissions, and service life. Honing abrasive strips are the core tool in the honing process, consisting of three parts: abrasive, bonding agent, and pores.

[0003] Currently, most high-end honing abrasive strips on the market (especially diamond or CBN strips) use copper-based bonds. While copper-based bonds (commonly bronze bonds) offer good toughness and decent abrasive holding power, their poor wear resistance results in a short lifespan, requiring frequent replacements, impacting processing efficiency and increasing unit costs. Cobalt is often added to copper-based bonded abrasive strips to improve wear resistance; however, cobalt is extremely expensive and highly volatile, leading to high production costs.

[0004] Therefore, there is an urgent need in this field for a new type of binder formulation that can maintain the excellent performance (good processing quality) of copper-based binders, improve the service life of abrasive strips, and reduce production costs. Summary of the Invention

[0005] In view of this, the technical problem to be solved by the present invention is to provide an iron-based binder honing strip and its preparation method. The iron-based binder honing strip provided by the present invention has the advantages of long service life, good processing quality and low cost.

[0006] This invention provides an iron-based binder honing strip, composed of the following raw materials by mass percentage:

[0007] Iron powder: 40%-60%, copper powder: 10%-30%, tin powder: 3%-15%, nickel powder: 2%-15%, tungsten carbide powder: 1%-10%, cerium oxide: 0.1%-5%, additives: 0.5%-5%, balance is cubic boron nitride.

[0008] Preferably, the additive is selected from one or more of graphite, molybdenum disulfide, zinc stearate, and naphthalene.

[0009] Preferably, the cerium oxide has a particle size of 20~30μm;

[0010] The particle size of the iron powder, copper powder, tin powder, nickel powder, tungsten carbide powder and additives is ≤80μm;

[0011] The cubic boron nitride has a particle size of 200 / 230.

[0012] Preferably, the overall hardness of the iron-based binder honing strip is 90-110 HRB.

[0013] Preferably, in the iron-based binder honing strip, the distribution density of cubic boron nitride is 30-100 particles / mm². 2 .

[0014] The present invention also provides a method for preparing the above-mentioned iron-based binder honing strip, comprising the following steps:

[0015] A) Iron powder, copper powder, tin powder, nickel powder, tungsten carbide powder, cerium oxide, additives and cubic boron nitride are mixed to obtain a mixture;

[0016] B) After the mixture is molded, it is hot-pressed and sintered to obtain iron-based binder honing strips.

[0017] Preferably, step A) includes the following steps:

[0018] Iron powder, copper powder, tin powder, nickel powder, tungsten carbide powder, cerium oxide, and additives are mixed for 6-8 hours, and then mixed with cubic boron nitride for 3-5 hours to obtain a mixture.

[0019] Preferably, the molding process includes the following steps:

[0020] (1) Assemble the mold: Select an appropriate graphite mold according to the size of the sand strip and assemble it;

[0021] (2) Feeding: Weigh a certain amount of the mixture and feed it into the assembled graphite mold layer by layer, and smooth the material with a scraper;

[0022] (3) Mold closing: Install the mold cover one by one into the mold after the material has been fed and press it tightly.

[0023] Preferably, the hot pressing sintering includes the following steps:

[0024] Staged hot pressing is performed under vacuum conditions:

[0025] The first stage temperature is set at 450-500℃, held for 2-3 minutes, and the pressure is set at 20-25MPa.

[0026] The second stage temperature is set at 650-700℃, held for 2-3 minutes, and the pressure is set at 30-35MPa.

[0027] The third stage temperature is set at 750-800℃, held for 3-4 minutes, and the pressure is set at 40-45MPa.

[0028] Preferably, after hot pressing and sintering, the process further includes cooling, trimming, and inspection.

[0029] Compared with existing technologies, this invention provides an iron-based bonded honing abrasive strip, composed of the following raw materials by weight percentage: iron powder: 40%-60%, copper powder: 10%-30%, tin powder: 3%-15%, nickel powder: 2-15%, tungsten carbide powder: 1%-10%, cerium oxide: 0.1%-5%, additives: 0.5%-5%, with the balance being cubic boron nitride. This invention uses an iron powder-based binder formulation, overcoming the shortcomings of existing copper-based bonded abrasive strips, such as short lifespan and high cost, providing a honing abrasive strip that combines long lifespan, good processing quality, and low cost. Iron powder is non-toxic, and using an iron powder-based binder can maximize the protection of the health of abrasive strip makers. The iron-based bonded honing abrasive strip provided by this invention can improve the qualification rate of cylinder liner texture, optimize oil storage and lubrication functions, reduce the risk of cylinder scoring, and extend engine life. At the same time, a good texture can reduce oil burning, reduce particulate matter and hydrocarbon emissions, and thus protect the environment. Attached Figure Description

[0030] Figure 1 A photograph of the iron-based honing strip prepared in Example 1;

[0031] Figure 2 SEM image of the microstructure of the iron-based honing strip prepared in Example 1;

[0032] Figure 3 This is a schematic diagram of the cylinder liner texture after honing with the iron-based honing sand strips prepared in Example 1.

[0033] Figure 4 This is a schematic diagram of the cylinder liner texture after honing with the iron-based honing sand strips prepared in Example 2.

[0034] Figure 5 This is a schematic diagram of the cylinder liner texture after honing with the iron-based honing sand strips prepared in Example 3. Detailed Implementation

[0035] This invention provides an iron-based binder honing strip, composed of the following raw materials by mass percentage:

[0036] Iron powder: 40%-60%, copper powder: 10%-30%, tin powder: 3%-15%, nickel powder: 2%-15%, tungsten carbide powder: 1%-10%, cerium oxide: 0.1%-5%, additives: 0.5%-5%, balance is cubic boron nitride.

[0037] The raw materials for preparing the iron-based binder honing abrasive strips provided by this invention include 40%-60% iron powder, which can be 40%, 45%, 50%, 55%, 60%, or any value between 40% and 60%. The particle size of the iron powder is ≤80μm. The iron powder is non-toxic, and using an iron powder-based binder can maximize the protection of the health of the abrasive strip maker while improving the pass rate of cylinder liner texture.

[0038] The raw materials for preparing the iron-based binder honing strip provided by this invention also include 10%-30% copper powder, which can be any value between 10%, 15%, 20%, 25%, 30%, or 10%-30%. The particle size of the copper powder is ≤80μm.

[0039] The raw materials for preparing the iron-based binder honing strip provided by this invention also include 3%-15% tin powder, which can be any value between 3%, 5%, 7%, 9%, 10%, 12%, 14%, 15%, or 3%-15%. The particle size of the tin powder is ≤80μm.

[0040] The raw materials for preparing the iron-based binder honing strips provided by this invention also include 2%-15% nickel powder, which can be any value between 2%, 3%, 5%, 7%, 9%, 10%, 12%, 14%, 15%, or 2%-15%. The particle size of the nickel powder is ≤80μm.

[0041] The raw materials for preparing the iron-based binder honing strips provided by this invention also include 1%-10% tungsten carbide powder, which can be 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, or any value between 1% and 10%. The particle size of the tungsten carbide powder is ≤80μm. This invention uses an iron-based binder system and, by adding the high-hardness, wear-resistant component tungsten carbide, significantly improves the durability of the honing strips while significantly reducing production costs.

[0042] The raw materials for preparing the iron-based bonded honing abrasive strips provided by this invention further include 0.1%-5% cerium oxide, which can be any value between 0.1%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, or 0.1%-5%. The particle size of the cerium oxide is 20~30μm, which can be any value or range between 20, 25, 30, or 20~30μm. This invention adds cerium oxide to the abrasive strips. This rare earth oxide has the functions of refining grains, purifying the material surface and interface, and adsorbing harmful impurities such as O, S, and P. At the same time, it can increase the brittleness of the abrasive strips, making the abrasive easier to release its edge.

[0043] The raw materials for preparing the iron-based binder honing strip provided by this invention further include 0.5%-5% of additives, which can be 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, or any value between 0.5% and 5%. The additives are selected from one or more of graphite, molybdenum disulfide, zinc stearate, and naphthalene. The particle size of the additives is ≤80μm.

[0044] The raw materials for preparing the iron-based binder honing strips provided by this invention also include a balance of cubic boron nitride. The particle size of the cubic boron nitride is 200 / 230.

[0045] The iron-based bonded honing strip provided by this invention has an overall hardness of 90-110 HRB. In the iron-based bonded honing strip, the distribution density of cubic boron nitride is 30-100 particles / mm². 2 It can be 30, 40, 50, 60, 70, 80, 90, 100, or 30-100 pieces / mm. 2 Any value between.

[0046] This invention utilizes the grinding action of cubic boron nitride (CBN) and designs a binder formula with iron powder as the main component. By adding the high-hardness, wear-resistant component tungsten carbide, the durability of honing abrasive strips is significantly improved. Adding rare earth oxide cerium oxide to the abrasive strips refines grains, purifies material surfaces and interfaces, adsorbs harmful impurities, and increases the brittleness of the abrasive strips, making it easier for the abrasive to exit its cutting edge. Iron powder is non-toxic and inexpensive; using honing abrasive strips with iron powder as the main component maximizes the protection of the abrasive strip maker's health while significantly reducing production costs. The abrasive strips provided by this invention can improve the pass rate of cylinder liner texture, reduce the risk of cylinder scoring, and extend engine life.

[0047] The present invention also provides a method for preparing the above-mentioned iron-based binder honing strip, comprising the following steps:

[0048] A) Iron powder, copper powder, tin powder, nickel powder, tungsten carbide powder, cerium oxide, additives and cubic boron nitride are mixed to obtain a mixture;

[0049] B) After the mixture is molded, it is hot-pressed and sintered to obtain iron-based binder honing strips.

[0050] Specifically, step A) includes the following steps:

[0051] Iron powder, copper powder, tin powder, nickel powder, tungsten carbide powder, cerium oxide, and additives are mixed for 6-8 hours, and then mixed with cubic boron nitride for 3-5 hours to obtain a mixture.

[0052] The mixture is then molded, and the molding process includes the following steps:

[0053] (1) Assemble the mold: Select an appropriate graphite mold according to the size of the sand strip and assemble it;

[0054] (2) Feeding: Weigh a certain amount of the mixture and feed it into the assembled graphite mold layer by layer, and smooth the material with a scraper;

[0055] (3) Mold closing: Install the mold cover one by one into the mold after the material has been fed and press it tightly.

[0056] After the mold is filled, place the mold containing the mixture into the designated position in the vacuum hot pressing sintering furnace, close the door, and evacuate the furnace. Under vacuum conditions, perform staged hot pressing:

[0057] The first stage temperature is set to 450-500℃, which can be 450, 460, 470, 480, 490, 500, or any value between 450-500℃. The holding time is 2-3 minutes, which can be 2, 2.5, 3, or any value between 2-3 minutes. The pressure is set to 20-25MPa, which can be 20, 21, 22, 23, 24, 25, or any value between 20-25MPa.

[0058] The second stage temperature is set to 650-700℃, which can be any value between 650, 660, 670, 680, 690, 700, or 650-700℃. The holding time is 2-3 minutes, which can be any value between 2, 2.5, 3, or 2-3 minutes. The pressure is set to 30-35MPa, which can be any value between 30, 31, 32, 33, 34, 35, or 30-35MPa.

[0059] The third stage temperature is set to 750-800℃, which can be any value between 750, 760, 770, 780, 790, 800, or 750-800℃. The holding time is 3-4 minutes, which can be any value between 3, 3.5, 4, or 3-4 minutes. The pressure is set to 40-45MPa, which can be any value between 40, 41, 42, 43, 44, 45, or 40-45MPa.

[0060] After hot pressing and sintering, the process also includes cooling, finishing, and inspection. Specifically, after cooling to room temperature in the furnace, the mold is removed from the workbench, the sanding strips are disassembled with a wrench, the burrs are removed with a grinding wheel, and then the strips are sent for inspection. If the inspection is qualified, the final iron-based binder honing sanding strip product is obtained.

[0061] Compared with the prior art, the present invention has the following significant advantages:

[0062] (1) Extremely long service life: Under the same processing conditions, the service life of the sanding strips provided by this invention is more than 100% longer than that of traditional copper-based sanding strips.

[0063] (2) Significantly reduced production costs: The price of iron powder is much lower than that of copper powder and cobalt powder. The abrasive strip of this invention uses iron powder as the main binder, replacing most of the copper and all of the cobalt, which can reduce the cost of raw materials by 30%-50%, resulting in significant economic benefits.

[0064] (3) Mature process and easy to promote: The powder metallurgy hot pressing sintering process used in this invention is a mature process in the abrasive industry. No additional equipment is required, the production process is stable and reliable, and it is easy to carry out large-scale industrial production.

[0065] To further understand the present invention, the iron-based binder honing strip and its preparation method provided by the present invention will be described below with reference to the embodiments. The scope of protection of the present invention is not limited by the following embodiments.

[0066] Example 1

[0067] A honing strip with an iron-based binder, the raw material composition (by mass percentage) is as follows:

[0068] Iron powder: 45%, copper powder: 25%, tin powder: 10%, nickel powder: 9%, tungsten carbide powder: 2%, cerium oxide: 0.5%, graphite: 3%. Except for cerium oxide, which uses a particle size of 20-30 micrometers, all other particles have a particle size below 80 μm. The balance is cubic boron nitride (CBN), with a particle size of 200 / 230.

[0069] Its preparation method is as follows:

[0070] (1) Mixing: Weigh out iron powder, copper powder, tin powder, nickel powder, tungsten carbide powder, cerium oxide, and additives in sequence and mix them in a three-dimensional mixer for 6 hours to ensure thorough and uniform mixing. Then weigh out cubic boron nitride and mix it in the three-dimensional mixer for 4 hours to ensure uniform distribution of each component.

[0071] (2) Molding:

[0072] ① Assemble the mold: Select an appropriate graphite mold for assembly;

[0073] ② Feeding: Weigh 16.91g of the mixture and feed it into the assembled graphite mold layer by layer. Use a scraper to smooth the material and ensure that the thickness is uniform in each place.

[0074] ③ Mold closing: Install the mold cover one by one into the mold after the material has been fed, and press it down gently by hand.

[0075] (3) Hot pressing and sintering:

[0076] ① Place the mold filled with the mixture into the designated position in the vacuum hot press sintering furnace, close the cover door, and evacuate the vacuum.

[0077] ② Set the temperature, pressure, and holding time: The first stage temperature is set to 450℃, holding time is 2 minutes, and the pressure is set to 20 MPa; the second stage temperature is set to 650℃, holding time is 3 minutes, and the pressure is set to 30 MPa; the third stage temperature is set to 770℃, holding time is 4 minutes, and the pressure is set to 40 MPa.

[0078] ③ Press the hot press switch to start hot pressing until hot pressing and sintering are completed.

[0079] (4) Cooling, finishing and inspection: After the furnace cools to room temperature, remove the mold from the workbench, and use a wrench to remove the sanding strip. The sanding strip is 100mm long, 4mm wide, and 6mm high. After removing the burrs with a grinding wheel, send it for inspection. Use a Rockwell hardness tester to test the hardness: HRB: 102. Use a microscope to measure the distribution density of cubic boron nitride: 42 particles / mm². 2 .

[0080] See Figures 1-3 , Figure 1 This is a photograph of the iron-based honing strip prepared in Example 1. Figure 2 This is a SEM image of the microstructure of the iron-based honing strip prepared in Example 1. Figure 3 This is a schematic diagram of the cylinder liner texture after honing with the iron-based honing sand strips prepared in Example 1.

[0081] Depend on Figure 2 It can be seen that the binder effectively encapsulates the abrasive and provides good holding force. From... Figure 3 It can be seen that the mesh pattern is evenly distributed and the intersection angle of the mesh patterns is consistent.

[0082] Example 2

[0083] A honing strip with an iron-based binder, the raw material composition (by mass percentage) is as follows:

[0084] Iron powder: 50%, copper powder: 20%, tin powder: 11%, nickel powder: 8%, tungsten carbide powder: 1.5%, cerium oxide: 1%, molybdenum disulfide: 3.5%. Except for cerium oxide, which uses a particle size of 20-30 micrometers, all other particles have a particle size below 80 micrometers. The balance is cubic boron nitride (CBN), with a particle size of 200 / 230.

[0085] Its preparation method is as follows:

[0086] (1) Mixing: Weigh out iron powder, copper powder, tin powder, nickel powder, tungsten carbide powder, cerium oxide, and additives in sequence and mix them in a three-dimensional mixer for 6 hours to ensure thorough and uniform mixing. Then weigh out cubic boron nitride and mix it in the three-dimensional mixer for 4 hours to ensure uniform distribution of each component.

[0087] (2) Molding:

[0088] ① Assemble the mold: Select an appropriate graphite mold for assembly;

[0089] ② Feeding: Weigh 24.87g of the mixture and feed it into the assembled graphite mold layer by layer. Use a scraper to smooth the material and ensure that the thickness is uniform in each place.

[0090] ③ Mold closing: Install the mold cover one by one into the mold after the material has been fed, and press it down gently by hand.

[0091] (3) Hot pressing and sintering:

[0092] ① Place the mold filled with the mixture into the designated position in the vacuum hot press sintering furnace, close the cover door, and evacuate the vacuum.

[0093] ② Set the temperature, pressure, and holding time: The first stage temperature is set to 450℃, holding time is 2 minutes, and the pressure is set to 20MPa; the second stage temperature is set to 650℃, holding time is 3 minutes, and the pressure is set to 30MPa; the third stage temperature is set to 770℃, holding time is 4 minutes, and the pressure is set to 40MPa.

[0094] ③ Press the hot press switch to start hot pressing until hot pressing and sintering are completed.

[0095] (4) Cooling, finishing and inspection: After the furnace cools to room temperature, remove the mold from the workbench, and use a wrench to remove the sanding strip. The sanding strip is 150mm long, 4mm wide and 6mm high. After removing the burrs with a grinding wheel, send it for inspection. Use a Rockwell hardness tester to test the hardness: HRB: 99. Use a microscope to measure the distribution density of cubic boron nitride: 38 particles / mm². 2 .

[0096] See Figure 4 , Figure 4 This is a schematic diagram of the cylinder liner texture after honing with the iron-based honing abrasive strips prepared in Example 2. Figure 4 It can be seen that the mesh pattern is evenly distributed and the intersection angle of the mesh patterns is consistent.

[0097] Example 3

[0098] A honing strip with an iron-based binder, the raw material composition (by mass percentage) is as follows:

[0099] Iron powder: 60%, copper powder: 15%, tin powder: 9%, nickel powder: 6%, tungsten carbide powder: 1%, cerium oxide: 1.5%, naphthalene: 2%. Except for cerium oxide, which uses a particle size of 20-30 micrometers, all other particles have a particle size below 80 μm. The balance is cubic boron nitride (CBN), with a particle size of 200 / 230.

[0100] Its preparation method is as follows:

[0101] (1) Mixing: Weigh out iron powder, copper powder, tin powder, nickel powder, tungsten carbide powder, cerium oxide, and additives in sequence and mix them in a three-dimensional mixer for 6 hours to ensure thorough and uniform mixing. Then weigh out cubic boron nitride and mix it in the three-dimensional mixer for 4 hours to ensure uniform distribution of each component.

[0102] (2) Molding:

[0103] ① Assemble the mold: Select an appropriate graphite mold for assembly;

[0104] ② Feeding: Weigh 16.82g of the mixture and feed it into the assembled graphite mold layer by layer. Use a scraper to smooth the material and ensure that the thickness is uniform in each place.

[0105] ③ Mold closing: Install the mold cover one by one into the mold after the material has been fed, and press it down gently by hand.

[0106] (3) Hot pressing and sintering:

[0107] ① Place the mold filled with the mixture into the designated position in the vacuum hot press sintering furnace, close the cover door, and evacuate the vacuum.

[0108] ② Set the temperature, pressure, and holding time: The first stage temperature is set to 450℃, holding time is 2 minutes, and the pressure is set to 20MPa; the second stage temperature is set to 650℃, holding time is 3 minutes, and the pressure is set to 30MPa; the third stage temperature is set to 770℃, holding time is 4 minutes, and the pressure is set to 40MPa.

[0109] ③ Press the hot press switch to start hot pressing until hot pressing and sintering are completed.

[0110] (4) Cooling, finishing and inspection: After the furnace cools to room temperature, remove the mold from the workbench, and use a wrench to remove the sanding strip. The sanding strip is 100mm long, 4mm wide and 6mm high. After removing the burrs with a grinding wheel, send it for inspection. Use a Rockwell hardness tester to test the hardness: HRB: 98. Use a microscope to measure the distribution density of cubic boron nitride: 41 particles / mm². 2 .

[0111] Comparative Example 1 (Copper-based abrasive strips)

[0112] Raw material composition (by weight):

[0113] Copper powder: 65%, tin powder: 20%, nickel powder: 8%, graphite: 2%. All powders have a particle size of less than 80 μm. The balance is cubic boron nitride (CBN) with a particle size of 200 / 230.

[0114] The preparation method is the same as in Example 1.

[0115] Hardness was tested using a Rockwell hardness tester; HRB: 101. Cubic boron nitride distribution density was measured using a microscope: 42 particles / mm². 2 .

[0116] Comparative Example 2 (Copper-based abrasive strips)

[0117] Raw material composition (by weight):

[0118] Copper powder: 60%, tin powder: 20%, cobalt powder: 13%, graphite: 2%. All powders have a particle size of less than 80 μm. The balance is cubic boron nitride (CBN) with a particle size of 200 / 230.

[0119] The preparation method is the same as in Example 1.

[0120] Hardness was tested using a Rockwell hardness tester; HRB: 102. Cubic boron nitride distribution density was measured using a microscope: 43 particles / mm². 2 .

[0121] Comparative Example 3 (Iron-based Sand Strips)

[0122] Raw material composition (by weight):

[0123] Iron powder: 47%, copper powder: 25%, tin powder: 10%, nickel powder: 9%, cerium oxide: 0.5%, graphite: 3%. Except for cerium oxide, which uses a particle size of 20-30 micrometers, all other particles have a particle size below 80 μm. The balance is cubic boron nitride (CBN), with a particle size of 200 / 230.

[0124] The preparation method is the same as in Example 1.

[0125] Hardness was tested using a Rockwell hardness tester; HRB: 99. Cubic boron nitride distribution density was measured using a microscope: 41 particles / mm². 2 .

[0126] Comparative Example 4 (Iron-based Sand Strips)

[0127] Raw material composition (by weight):

[0128] Iron powder: 45.5%, copper powder: 25%, tin powder: 10%, nickel powder: 9%, tungsten carbide powder: 2%, graphite: 3%. All powders have a particle size of less than 80 μm. The balance is cubic boron nitride (CBN) with a particle size of 200 / 230.

[0129] The preparation method is the same as in Example 1.

[0130] Hardness was tested using a Rockwell hardness tester; HRB: 102. Cubic boron nitride distribution density was measured using a microscope: 42 particles / mm². 2 .

[0131] Performance testing:

[0132] Honing was performed on the same batch of gray cast iron cylinder liners using the same model of honing machine. The number of cylinder liners that could be machined by each abrasive strip until it was completely worn out, as well as the pass rate of the honing pattern, were recorded.

[0133] Results: In Example 1, 2950 pieces were processed with sanding strips, and the mesh pattern qualification rate was 86%.

[0134] Example 2: 2942 pieces were processed with sanding strips, with a mesh pattern qualification rate of 90%;

[0135] Example 3: 2961 pieces were processed with sanding strips, with a mesh pattern qualification rate of 89%;

[0136] Comparative Example 1 (copper-based) abrasive strips were used to process 1182 pieces, with a mesh pattern qualification rate of 71%;

[0137] Comparative Example 2 (copper-based) abrasive strips were used to process 1456 pieces, with a mesh pattern qualification rate of 69%;

[0138] Comparative Example 3 (iron-based) abrasive strips were used to process 1438 pieces, with a mesh pattern qualification rate of 75%;

[0139] After processing 1331 pieces with Comparative Example 4 (iron-based) abrasive strips, the grinding efficiency decreased, the abrasive strips were removed from the machine, and the mesh pattern qualification rate was 65%.

[0140] Test results show that the lifespan of the abrasive strips of this invention far exceeds that of copper-based abrasive strips, and the mesh pattern qualification rate is also better than that of copper-based abrasive strips. The simultaneous addition of tungsten carbide and cerium oxide to iron-based abrasive strips significantly improves the effect.

[0141] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A honing strip with an iron-based binder, characterized in that, From the following mass percentage of raw materials composition: Iron powder: 40%-60%, copper powder: 10%-30%, tin powder: 3%-15%, nickel powder: 2%-15%, tungsten carbide powder: 1%-10%, cerium oxide: 0.1%-5%, additives: 0.5%-5%, balance is cubic boron nitride.

2. The iron-based binder honing strip according to claim 1, characterized in that, The additive is selected from one or more of graphite, molybdenum disulfide, zinc stearate, and naphthalene.

3. The iron-based binder honing strip according to claim 1, characterized in that, The cerium oxide has a particle size of 20~30μm; The particle size of the iron powder, copper powder, tin powder, nickel powder, tungsten carbide powder and additives is ≤80μm; The cubic boron nitride has a particle size of 200 / 230.

4. The iron-based binder honing strip according to claim 1, characterized in that, The overall hardness of the iron-based binder honing strip is 90-110 HRB.

5. The iron-based binder honing strip according to claim 1, characterized in that, In the iron-based binder honing strip, the distribution density of cubic boron nitride is 30-100 particles / mm. 2 .

6. A method for preparing an iron-based binder honing strip as described in any one of claims 1 to 5, characterized in that, Includes the following steps: A) Iron powder, copper powder, tin powder, nickel powder, tungsten carbide powder, cerium oxide, additives and cubic boron nitride are mixed to obtain a mixture; B) After the mixture is molded, it is hot-pressed and sintered to obtain iron-based binder honing strips.

7. The preparation method according to claim 6, characterized in that, Step A) includes the following steps: Iron powder, copper powder, tin powder, nickel powder, tungsten carbide powder, cerium oxide, and additives are mixed for 6-8 hours, and then mixed with cubic boron nitride for 3-5 hours to obtain a mixture.

8. The preparation method according to claim 6, characterized in that, The molding process includes the following steps: (1) Assemble the mold: Select an appropriate graphite mold according to the size of the sand strip and assemble it; (2) Feeding: Weigh a certain amount of the mixture and feed it into the assembled graphite mold layer by layer, and smooth the material with a scraper; (3) Mold closing: Install the mold cover one by one into the mold after the material has been fed and press it tightly.

9. The preparation method according to claim 6, characterized in that, The hot pressing sintering includes the following steps: Staged hot pressing is performed under vacuum conditions: The first stage temperature is set at 450-500℃, held for 2-3 minutes, and the pressure is set at 20-25MPa. The second stage temperature is set at 650-700℃, held for 2-3 minutes, and the pressure is set at 30-35MPa. The third stage temperature is set at 750-800℃, held for 3-4 minutes, and the pressure is set at 40-45MPa.

10. The preparation method according to claim 6, characterized in that, After hot pressing and sintering, the process also includes cooling, trimming, and inspection.

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