Manufacturing method of pure dry diamond grinding disc

Abstract

This invention discloses a method for manufacturing a pure dry diamond grinding disc, belonging to the field of grinding tool technology. The raw materials for the grinding block are composed of metal powders such as copper, iron, tin, cobalt, nickel, and phosphor bronze alloy, as well as diamond and liquid paraffin. Through the optimized design of the cutting head and the base, this invention provides more chip removal holes on the contact surface of the grinding disc during grinding. This allows for the removal of more sand and dust when cutting concrete and granite. The heat generated during grinding is also carried away more easily with the flow of sand and dust. Simultaneously, high-frequency copper sheet welding is used to weld the grinding block and the base together, improving the bonding strength.

Description

Technical Field

[0001] This invention relates to the field of grinding tool technology, specifically to a method for manufacturing a pure dry diamond grinding disc, which is mainly used for grinding, smoothing, and refinishing reinforced concrete pavements, highways, bridges, and underground civil defense engineering pavements. Background Technology

[0002] In today's rapidly developing economy, energy conservation and environmental protection are receiving increasing attention, and infrastructure construction cannot function without grinding tools. Traditional similar products often require water for cooling, which generates a large amount of dust. Furthermore, the use of water makes on-site management difficult and can even lead to electrical leaks and personal injury during water-based construction.

[0003] Therefore, it is extremely important to develop more efficient and energy-saving grinding tools that are used in a more environmentally friendly manner and do not generate excess wastewater, so as to achieve better economic benefits and reduce the waste of electricity and the excessive consumption of diamond and metal powder. Summary of the Invention

[0004] The purpose of this invention is to provide a method for manufacturing a pure dry diamond grinding disc. Through the optimized design of the cutting head and the substrate, the grinding disc has more chip removal holes on the contact surface during grinding. When cutting concrete and granite, more sand and dust can be removed through the chip removal holes. The heat generated during grinding is also carried away with the flow of sand and dust, thereby reducing the risk of the diamond cutting head burning due to overheating and affecting its use.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A method for manufacturing a pure dry diamond grinding disc, the diamond grinding disc comprising a grinding disc substrate and diamond grinding blocks, wherein the grinding disc substrate is made of 45# steel, and the raw materials of the diamond grinding blocks are composed of copper, tin, nickel, cobalt, phosphor bronze alloy, liquid paraffin, and diamond; the manufacturing method of the diamond grinding disc includes the following steps:

[0007] (1) Matrix processing:

[0008] According to the drawing requirements, the steel plate is processed into the base shape;

[0009] (2) Preparation of diamond grinding blocks:

[0010] Weigh out each raw material according to the composition of diamond grinding blocks and mix them evenly. Then put them into a mold and cold press them into shape. Then hot press and sinter them. After sintering, use a grinding wheel and abrasive belt to grind and produce diamond grinding blocks.

[0011] (3) High-frequency welding:

[0012] Place the grinding block in the corresponding position on the substrate, place the copper solder sheet between the grinding block and the substrate, and then heat to the welding temperature.

[0013] (4) Sandblast the inner surface of the pure dry diamond grinding block obtained after welding, and then grind the working surface of the diamond grinding block with a grinding wheel to expose the diamond.

[0014] The diamond grinding block raw material has a diamond particle size of 40 / 50 or 50 / 60 and a compressive strength of 25-40 kg; the phosphorus content in the phosphorus copper alloy is 8-15 wt.%.

[0015] The raw material composition of the diamond grinding blocks, by weight, is as follows:

[0016] Copper 23-34 parts, iron 29-40 parts, nickel 4-12 parts, cobalt 11-20 parts, tin 5-10 parts, phosphorus copper alloy 5-12 parts, liquid paraffin 0.9-1.6 parts, diamond 1.0-2.4 parts.

[0017] The preferred raw material composition of the diamond grinding block, by weight, is as follows:

[0018] Copper 27-29 parts, iron 30-38 parts, nickel 5-10 parts, cobalt 12-17 parts, tin 6-9 parts, phosphor bronze alloy 6-11 parts, liquid paraffin 1.0-1.5 parts, diamond 1.2-2.2 parts.

[0019] The raw material composition of the diamond grinding block is more preferably as follows, based on parts by weight:

[0020] 28 parts copper, 32 parts iron, 7 parts nickel, 12 parts cobalt, 8 parts tin, 7 parts phosphorus copper alloy, 1.3 parts liquid paraffin, and 1.6 parts diamond.

[0021] In step (2) above, the hot-pressing sintering temperature is 630–680℃, and the pressure is 240–320 g / cm³. 2 The heat preservation time is 200-300 seconds.

[0022] In step (3) above, the high-frequency welding temperature is 700-735℃ and the welding time is 10-15 seconds.

[0023] Preferably, the grinding disc substrate includes an outer ring and an inner ring; the diamond grinding blocks are welded to the outer ring; wherein: the inner ring of the grinding disc substrate is provided with teardrop-shaped drainage holes A, and the number of drainage holes A is 3-6; the diamond grinding blocks are in multiple groups, each group consisting of two L-shaped grinding blocks arranged opposite each other; a 5-10mm gap is left between the two L-shaped grinding blocks in each group to form a drainage channel, and drainage holes B are opened on the substrate corresponding to the drainage channel.

[0024] Preferably, the grinding disc substrate has a mounting hole at its center for mounting on a grinding mill; the grinding disc substrate has a drain groove on the outer edge of the disc and between two adjacent sets of diamond grinding blocks.

[0025] Preferably, the drain hole A is opened between the two sets of diamond grinding blocks, thereby forming convection with the drain groove on the outer ring of the disc.

[0026] The design principle and beneficial effects of this invention are as follows:

[0027] 1. The present invention improves the structure of diamond grinding blocks by designing each set of grinding blocks as a double L-shape. During the cutting process, the debris, sand and dust generated during grinding can be quickly discharged through the drainage groove and drainage hole B between the double L-shaped grinding blocks, and the high heat generated during grinding is also carried away.

[0028] 2. Due to the L-shaped design of the grinding block and its small contact area with the substrate, the grinding block is prone to detachment during grinding. To improve the bonding force between the grinding block and the substrate, and also because copper sheets are used as welding plates, the composition of the grinding block is optimized. A high iron content is used in the grinding block to improve wettability with the substrate material, and a high copper content is used to improve wettability with the copper welding plates. However, copper and iron are prone to oxidation during high-temperature sintering and welding. Therefore, in this invention, part of the copper element is provided by elemental copper, and the other part is provided by a copper-phosphorus alloy to reduce the tendency of elemental copper to oxidize easily during hot-pressing sintering and welding. The copper-phosphorus alloy serves two purposes: providing copper and absorbing oxygen at high temperatures. During sintering and welding, it reduces the oxygen content on the welding surface, lowering the oxidation tendency of copper and iron and thus improving the bonding force.

[0029] 3. The grinding block and the substrate of this invention are bonded by high-frequency welding. Through the design of the grinding block composition (such as the appropriate addition of tin and phosphor bronze alloy), the sintering and welding temperatures are lower, and the welding bond strength is higher, resulting in better safety performance. This ensures that the grinding head can withstand high-speed impacts when grinding hard objects such as steel bars and pebbles, and is not easily detached. At the same time, the strength of the grinding block is guaranteed (e.g., by the appropriate addition of cobalt).

[0030] 4. The present invention has a drainage groove cut between the two grinding blocks in each group of grinding discs, which helps to generate greater airflow and accelerate cooling. The center of the base has 3-6 drip-shaped drainage holes A, which can further discharge the dust and sand generated during grinding and form convection with the drainage hole groove on the outer ring of the grinding disc.

[0031] 5. This invention uses high-frequency welding, and the welding piece is a copper sheet. Because copper has a high melting point, the welding strength can remain unchanged even if the grinding block generates a high temperature during the grinding process after high-temperature welding.

[0032] 6. The diamond grinding disc of this invention does not require water for cooling, thus avoiding the difficulties in handling the construction site caused by adding water and reducing the risk of personal injury due to electric leakage during water-based construction. This invention can be used with dust removal equipment to quickly remove dust. Attached Figure Description

[0033] Figure 1 This is a schematic diagram (front view) of the pure dry diamond grinding disc structure of the present invention.

[0034] Figure 2 This is a schematic diagram of the structure of the pure dry diamond grinding disc of the present invention (radial sectional view of the disc body).

[0035] In the figure: 1-Grinding disc base; 2-Grinding block; 3-Drain hole A; 4-Drain hole B; 5-Drain groove; 6-Drain groove opening. Detailed Implementation

[0036] To further understand the present invention, the present invention is described below with reference to examples. However, the examples are only for further illustrating the features and advantages of the present invention, and are not intended to limit the scope of the claims of the present invention.

[0037] This invention provides a method for manufacturing a pure dry diamond grinding disc, the diamond grinding disc comprising a grinding disc substrate 1 and diamond grinding blocks, such as... Figure 1-2 As shown. The grinding disc base is made of 45# steel and includes an outer ring and an inner ring. The diamond grinding blocks are welded to the outer ring. The inner ring of the grinding disc base has teardrop-shaped drainage holes A3, and the number of drainage holes A is 3-6. The diamond grinding blocks are in multiple groups, each group consisting of two L-shaped grinding blocks 2 arranged opposite each other (the free ends of the two L-shaped grinding blocks are arranged opposite each other). A drainage groove 5 is formed between the two L-shaped grinding blocks in each group with a spacing of 5-10mm. Drainage holes B4 are opened on the base corresponding to the drainage groove.

[0038] The grinding disc base has a mounting hole at its center for mounting on a grinding mill; the grinding disc base has a drain groove 6 on the outer edge of the disc and between two adjacent sets of diamond grinding blocks.

[0039] The drain hole A is located between the two sets of diamond grinding blocks (the drain hole A is located inside the drain groove), thereby forming convection with the drain groove of the outer ring of the disc.

[0040] In the following embodiments, the raw materials of the diamond grinding blocks are composed of copper, tin, nickel, cobalt, phosphor bronze alloy, liquid paraffin and diamond, wherein the diamond particle size is 40 / 50 or 50 / 60 and the compressive strength is 25-40 kg; the phosphorus content in the phosphor bronze alloy is 12 wt.%.

[0041] Example 1:

[0042] The diamond grinding disc preparation process in this embodiment is as follows:

[0043] 1. According to the drawing requirements, the base material is made of steel plate, which undergoes quenching and heat treatment, tempering, laser cutting of shape, tempering, grinding of surface, grinding of inner hole, grinding of outer circle, deburring and other processes.

[0044] 2. Take 2.85 kg of copper powder, 3.55 kg of iron powder, 0.9 kg of nickel powder, 1.2 kg of cobalt powder, 0.6 kg of tin powder, and 1.0 kg of phosphor bronze alloy. Mix them in a mixing tank for 40 minutes. Then add 0.11 kg of liquid paraffin and 0.21 kg of diamond, and continue mixing for 3 hours. Next, pour the powder into a mold and cold-press it into shape, followed by hot-press sintering. Grind the mixture using a grinding wheel and belt. The hot-press sintering temperature is 665℃, and the pressure is 300 g / cm³. 2 The heat preservation time is 240 seconds.

[0045] 3. Place the grinding block and the substrate together in the corresponding position on the substrate as required by the drawing. Place a copper solder pad between the grinding block and the substrate. Adjust the high-frequency welding machine to the appropriate position for the grinding block and the substrate, and start the high-frequency welding machine to weld. The welding temperature is 725℃, and the welding time is 12 seconds. After the grinding block and the substrate are welded together, apply a pressure of 600 N / mm². 2 The strength standard tested the welding strength of each diamond grinding block, and the test results were qualified.

[0046] 4. Polish the substrate surface with a grinder until it is smooth, then grind the working surface of the diamond grinding block with an abrasive wheel to expose the diamond. Next, spray paint the surface and dry it to prevent rusting. Finally, apply a 600 N / mm polishing solution. 2 The strength standard involves testing the welding strength of each diamond grinding block. After passing the test, the surface is painted, dried to prevent rusting, and finally screen-printed, laser-marked, packaged, and put into storage.

[0047] Example 2:

[0048] The diamond grinding disc preparation process in this embodiment is as follows:

[0049] 1. According to the drawing requirements, the base material is made of steel plate, which undergoes quenching and heat treatment, tempering, laser cutting of shape, tempering, grinding of surface, grinding of inner hole, grinding of outer circle, deburring and other processes.

[0050] 2. Take 2.8 kg of copper powder, 3.2 kg of iron powder, 0.7 kg of nickel powder, 1.2 kg of cobalt powder, 0.8 kg of tin powder, and 0.7 kg of phosphor bronze alloy. Mix them in a mixing tank for 40 minutes. Then add 0.13 kg of liquid paraffin and 0.16 kg of diamond, and continue mixing for 3 hours. Next, pour the powder into a mold and cold-press it into shape, followed by hot-pressing and sintering. Finally, grind the mixture using a grinding wheel and belt. The hot-pressing sintering temperature is 665℃, and the pressure is 300 g / cm³. 2 The heat preservation time is 240 seconds.

[0051] 3. Place the grinding block and the substrate together in the corresponding position on the substrate as required by the drawing. Place a copper solder pad between the grinding block and the substrate. Adjust the high-frequency welding machine to the appropriate position for the grinding block and the substrate, and start the high-frequency welding machine to weld. The welding temperature is 725℃, and the welding time is 12 seconds. After the grinding block and the substrate are welded together, apply a pressure of 600 N / mm². 2 The strength standard tested the welding strength of each diamond grinding block, and the test results were qualified.

[0052] 4. Polish the substrate surface with a grinder until it is smooth, then grind the working surface of the diamond grinding block with an abrasive wheel to expose the diamond. Next, spray paint the surface and dry it to prevent rusting. Finally, apply a 600 N / mm polishing solution. 2 The strength standard involves testing the welding strength of each diamond grinding block. After passing the test, the surface is painted, dried to prevent rusting, and finally screen-printed, laser-marked, packaged, and put into storage.

[0053] Example 3:

[0054] The diamond grinding disc preparation process in this embodiment is as follows:

[0055] 1. According to the drawing requirements, the base material is made of steel plate, which undergoes quenching and heat treatment, tempering, laser cutting of shape, tempering, grinding of surface, grinding of inner hole, grinding of outer circle, deburring and other processes.

[0056] 2. Take 2.85 kg of copper powder, 3.75 kg of iron powder, 0.6 kg of nickel powder, 1.5 kg of cobalt powder, 0.85 kg of tin powder, and 0.9 kg of phosphor bronze alloy. Mix them in a mixing tank for 40 minutes. Then add 0.13 kg of liquid paraffin and 0.18 kg of diamond, and continue mixing for 3 hours. Next, pour the powder into a mold and cold-press it into shape, followed by hot-press sintering. Finally, grind the mixture using a grinding wheel and belt. The hot-press sintering temperature is 670℃, and the pressure is 300 g / cm³. 2 The heat preservation time is 240 seconds.

[0057] 3. Place the grinding block and the substrate together in the corresponding position on the substrate as required by the drawing. Place a copper solder pad between the grinding block and the substrate. Adjust the high-frequency welding machine to the appropriate position for the grinding block and the substrate, and start the high-frequency welding machine to weld. The welding temperature is 715℃, and the welding time is 12 seconds. After the grinding block and the substrate are welded together, apply a pressure of 600 N / mm². 2 The strength standard tested the welding strength of each diamond grinding block, and the test results were qualified.

[0058] 4. Polish the substrate surface with a grinder until it is smooth, then grind the working surface of the diamond grinding block with an abrasive wheel to expose the diamond. Next, spray paint the surface and dry it to prevent rusting. Finally, apply a 600 N / mm polishing solution. 2The strength standard involves testing the welding strength of each diamond grinding block. After passing the test, the surface is painted, dried to prevent rusting, and finally screen-printed, laser-marked, packaged, and put into storage.

Claims

1. A method for manufacturing a purely dry diamond grinding disc, characterized in that: The diamond grinding disc includes a grinding disc base and diamond grinding blocks. The grinding disc base includes an outer ring and an inner ring. The diamond grinding blocks are welded to the outer ring. The inner ring of the grinding disc base has 3-6 teardrop-shaped drainage holes A. The diamond grinding blocks are in multiple groups, each group consisting of two L-shaped grinding blocks arranged opposite each other. A drainage groove is formed between the two L-shaped grinding blocks in each group with a spacing of 5-10 mm. Drainage holes B are opened on the base corresponding to the drainage groove. The grinding disc substrate is made of 45# steel, and the raw materials for the diamond grinding block consist of copper, tin, nickel, cobalt, phosphor bronze alloy, liquid paraffin, and diamond; the manufacturing method of the diamond grinding disc includes the following steps: (1) Matrix processing: According to the drawing requirements, the steel plate is processed into the base shape; (2) Preparation of diamond grinding blocks: Weigh out each raw material according to the composition of diamond grinding blocks and mix them evenly. Then put them into a mold and cold press them into shape. Then hot press and sinter them. After sintering, use a grinding wheel and abrasive belt to grind and produce diamond grinding blocks. (3) High-frequency welding: Place the grinding block in the corresponding position on the substrate, place the copper solder sheet between the grinding block and the substrate, and then heat to the welding temperature. (4) Sandblast the inner surface of the pure dry diamond grinding block obtained after welding, and then grind the working surface of the diamond grinding block with a grinding wheel to expose the diamond.

2. The method for manufacturing a pure dry diamond grinding disc according to claim 1, characterized in that: The diamond grinding block raw material has a diamond particle size of 40 / 50 or 50 / 60 and a compressive strength of 25-40 kg; the phosphorus content in the phosphorus-copper alloy is 8-15 wt.%.

3. The method for manufacturing a pure dry diamond grinding disc according to claim 2, characterized in that: The raw material composition of the diamond grinding blocks, by weight, is as follows: Copper 23-34 parts, iron 29-40 parts, nickel 4-12 parts, cobalt 11-20 parts, tin 5-10 parts, phosphorus copper alloy 5-12 parts, liquid paraffin 0.9-1.6 parts, diamond 1.0-2.4 parts.

4. The method for manufacturing a pure dry diamond grinding disc according to claim 2, characterized in that: The raw material composition of the diamond grinding blocks, by weight, is as follows: Copper 27-29 parts, iron 30-38 parts, nickel 5-10 parts, cobalt 12-17 parts, tin 6-9 parts, phosphor bronze alloy 6-11 parts, liquid paraffin 1.0-1.5 parts, diamond 1.2-2.2 parts.

5. The method for manufacturing a pure dry diamond grinding disc according to claim 2, characterized in that: The raw material composition of the diamond grinding blocks, by weight, is as follows: 28 parts copper, 32 parts iron, 7 parts nickel, 12 parts cobalt, 8 parts tin, 7 parts phosphorus copper alloy, 1.3 parts liquid paraffin, and 1.6 parts diamond.

6. The method for manufacturing a pure dry diamond grinding disc according to claim 1, characterized in that: In step (2), the hot-pressing sintering temperature is 630–680℃, and the pressure is 240–320 g / cm³. 2 The heat preservation time is 200-300 seconds.

7. The method for manufacturing a pure dry diamond grinding disc according to claim 1, characterized in that: In step (3), the high-frequency welding temperature is 700-735℃ and the welding time is 10-15 seconds.

8. The method for manufacturing a pure dry diamond grinding disc according to claim 1, characterized in that: The grinding disc base has a mounting hole at its center for mounting on a grinding mill; the grinding disc base has a drain groove on the outer edge of the disc and between two adjacent sets of diamond grinding blocks.

9. The method for manufacturing a pure dry diamond grinding disc according to claim 1, characterized in that: The drain hole A is located between two sets of diamond grinding blocks, thereby forming convection with the drain groove on the outer ring of the disc.

Images