CN112677061B - Brazing diamond grinding disc for steel grinding and preparation method thereof - Google Patents
Brazing diamond grinding disc for steel grinding and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a brazed diamond grinding disc for steel grinding, wherein the granularity interval of diamond particles of the brazed diamond grinding disc is 20-120 meshes, and the particle size floating range of the diamond particles of a single diamond grinding disc is not more than 20%; and the diamond cutting edge is flush, the top end of the diamond abrasive particle is kept to be a profile, and the profile is vertical to the normal direction of the matrix. The diamond grinding disc for steel grinding can process the surface of a steel material with high quality and high efficiency. By controlling the granularity interval of the diamond on the surface of the grinding disc and the position of the surface cutting edge, the surface of the steel material is polished and cleaned on the premise of not reducing the granularity grade of the diamond, and the purposes that the surface roughness meets the requirement and the processing efficiency is high are achieved. The grinding disc not only can be applied to grinding the surface of the steel material, but also can be prepared into other shapes to carry out plane grinding, end face grinding and the like on the material, and is an innovative process with wide adaptability.
Description
Technical Field
The invention belongs to the field of superhard abrasive tool preparation, and particularly relates to a brazed diamond grinding disc for steel grinding and a preparation method thereof.
Background
The conventional method for polishing the surface of the steel material at present is to perform manual polishing by using a manual grinder provided with a resin grinding wheel. The resin grinding wheel is made up by using resin as adhesive material, using metal powder, metal oxide and general abrasive as filler and mixing them to obtain binding agent, mixing the abrasive and binding agent according to the requirements of concentration to obtain formed material, hot-pressing, solidifying and making it into product blank body, then making the product.
The resin grinding wheel for grinding the steel material is manufactured by solidifying the superhard grinding materials such as silicon carbide and the like into a disc shape by utilizing the principle of resin solidification. The grinding wheel is widely applied to the grinding industry, but long-term application and research show that the resin grinding wheel has great defects in the using process: 1. the resin grinding wheel has poor water resistance and alkali resistance and short storage life. 2. The bonding strength is low, and the abrasive material is consumed quickly. 3. The polishing process has the disadvantages of large sparks, large smell and large dust, and has great harm to the environment. 4. The grinding efficiency gradually decreases.
Based on the above problems and environmental protection requirements, a novel grinding and polishing tool with high grinding and polishing efficiency, no dust, little pollution and convenient operation of operators is needed. The grinding disc abrasive needs to be selected according to the efficiency and the service life of steel processing and the economical efficiency of the abrasive.
At present, the industrial production of artificial diamond and CBN (cubic boron nitride) is mature, the cost is continuously reduced, and the superhard tools of diamond and CBN are rapidly developed in recent decades. In order to achieve the aim of efficiently polishing steel materials, the available abrasives, in addition to silicon carbide and corundum, become ideal choices of super-hard abrasives represented by artificial diamond and CBN.
Cubic Boron Nitride (CBN) tools are suitable for hard-to-machine materials such as work-hardened steel, high-hardness alloy steel, gray cast iron, nickel-based superalloy, and the like, and have the biggest disadvantages of low strength and poor toughness, and are mostly used for fine machining with good equipment rigidity. The steel material grinding and polishing equipment is low in rigidity, abrasive particles required by the grinding and polishing process are large in granularity (30-80 meshes), and large-granularity CBN abrasive particles are long in edge angle, are easy to break compared with diamond abrasive particles, and obviously increase the cost. Therefore, it is not preferable to use CBN as the abrasive grain for main machining in grinding work of iron and steel materials.
At present, there are three main combining modes of electroplating, sintering and brazing.
The sintered metal bond diamond tool is mainly used in the grinding and cutting process of hard and brittle materials due to low bonding strength of abrasive particles and small exposure height.
Electroplated diamond tools are made by electroplating a layer of metal (typically nickel and nickel-cobalt alloys) onto a substrate and consolidating diamond abrasive grains within the deposited metal. Since diamond is mechanically embedded, the coating has low holding strength to diamond, and in order to firmly hold the diamond, the diamond needs to be embedded to 50% or more of its own height. Due to the disadvantages of the electroplated diamond tool, diamond abrasive grains are easy to fall off when a load is ground. Therefore, the grinding disc is prepared by firmly welding the diamond on a steel substrate in a brazing mode.
The brazing diamond technology is a technology for brazing connection by using a welding flux which can generate chemical reaction with diamond abrasive particles and generate metallurgical bonding with a steel matrix. Because the solder contains active elements which can react with the diamond, the diamond and the solder interface are combined chemically and metallurgically, so the bonding strength is high, and the diamond is not easy to fall off from the substrate. Compared with the electroplating tool, the abrasive grain exposure is higher than that of the electroplating tool with 1. 2. The space for containing the scraps is large. 3. Good heat dissipation and the like.
However, when the diamond grinding disc grinds the steel material, each diamond abrasive grain is equivalent to one small cutting tool bit, so that dents are smoothly scraped and cut on the surface of the steel material, and when the granularity of the diamond grains is inconsistent, the depths of the dents are different. This requires consistency and contour of the grain size of the diamond table for grinding ferrous materials.
On the other hand, when the surface of the abrasive grain is in contact with the metal material in the direction of the cutting edge, the cutting edge at the tip of the abrasive grain may be broken and ground flat by a large load, and the quality of the processed surface may be affected. Its grit blade direction distributes at random after the diamond grit arranges, and when the grit blade up, the shearing force can cause the load of grit blade big, forms local breakage, influences the life-span. On the other hand, under the condition of large load, the high temperature generated at the tip of the abrasive particle is easy to cause the adhesion of the diamond surface and abrasive dust or a substrate, and the processing efficiency is reduced.
The conventional diamond grinding disc is used for processing steel materials, and the conventional method is that the grain size grade of the diamond is reduced, and certain processing smoothness is ensured by reducing the grain size of the diamond, but the processing efficiency of the diamond is seriously influenced.
Therefore, the application of the diamond tool in the processing of steel materials has certain problems. If the grain size grade is not changed, the contour of the abrasive grains and the controllable crystal profile need to be ensured.
The control of abrasive particles and the like adopts a grinding wheel dressing measure at present, so that the cutting edge of the abrasive particles is flush, and in the dressing process, the leveled high abrasive particles have the phenomenon of local crushing of the abrasive particles to form new micro blades, which is beneficial to grinding, but has the possibility of reducing the grinding service life. And the grinding of the single-layer brazing diamond tool has higher requirements on the grinding tool, high cost and complex process, and is not beneficial to the batch preparation of the diamond grinding disc for grinding steel.
Disclosure of Invention
In order to solve the problems, the invention provides a brazed diamond grinding disc for steel grinding and a preparation method thereof. The brazing diamond grinding disc for steel grinding can be used for processing the surface of a steel material with high quality and high efficiency. By controlling the granularity interval of the diamond on the surface of the grinding disc and the position of the surface cutting edge, the surface of the steel material is polished and cleaned on the premise of not reducing the granularity grade of the diamond, so that the aims of meeting the requirement on surface roughness and having high processing efficiency are fulfilled. The brazing diamond grinding disc prepared by the invention not only can be applied to grinding the surface of a steel material, but also can be prepared into other shapes to carry out plane grinding, end face grinding and the like on the material, and is an innovative process with wide adaptability.
The diamond particle size interval of the brazing diamond grinding disc for steel grinding is 20-120 meshes; the particle size floating range of the diamond particles is not more than 20 percent, namely the value of the maximum value of the particle size of the diamond abrasive particles larger than the minimum value is not more than 20 percent on the surface of the same grinding disc; and the diamond cutting edge is flush, the top end of the diamond abrasive particle is kept to be a profile, and the profile is vertical to the normal direction of the substrate.
As an improvement, the maximum value of the particle size of the diamond abrasive grains is not more than 10% larger than the minimum value.
The brazed diamond grinding disc for steel grinding, provided by the invention, has the advantages that the cross section of the diamond part arranged on the surface of the grinding disc substrate can be planar, cambered, inclined or the combination of the three parts.
The brazing diamond grinding disc for steel grinding provided by the invention has the following outer diameter size ranges: 80 mm-230 mm
The brazing diamond grinding disc for steel grinding is characterized in that the diamond is a synthetic diamond crystal with a regular profile.
The range of the size fluctuation of the diamond particles arranged on the surface of a single grinding disc is not more than 20 percent, and preferably not more than 10 percent. In the field of grinding and processing of steel and iron materials, diamond is similar to a micro lathe tool for cutting when being removed, turning marks scratched on the surface of a grinding particle cutting edge are deep, when the size range of the grinding particles is large, deep scratches are easily left on the surface, the surface quality is affected, only large particles participate in processing, and small-particle-size particles are difficult to play a role. In addition, when the particle size range of the abrasive grains is too large, there is a possibility that when a part of the abrasive grains face, the other part is still in a state where the sharp edge faces upward, and the effect of flattening the whole body cannot be achieved. Therefore, the range of the grain size of the abrasive grain is limited to 20%, which is also close to the single interval range of the conventional diamond grain size interval, and the floating range of the diamond grain size is preferably 10% for further controlling the quality of the processed surface and improving the performance. In addition, the smaller the particle size range is, the better the process effect of the subsequent diamond flattening is.
The diamond granularity interval is 20-120 meshes. The grain size range of abrasive particles required by the conventional steel material grinding processing under the general condition is comprehensively determined according to the processed surface quality and efficiency, the grinding working condition requirements of most of grinding can be met within 20-120 meshes under the normal condition, and due to the treatment of a new process, a workpiece with higher surface quality can be processed by the novel grinding disc under the same grain size condition.
(3) The outer diameter size range of the grinding disc is as follows: 80 mm-230 mm. The conventional grinding disc is installed on a pneumatic or electric angle grinder to remove the surface of materials, and in order to improve the adaptability, the novel grinding disc also adopts the specification range similar to the conventional grinding disc.
(4) The diamond is a synthetic diamond crystal with a regular profile. In order to ensure that the diamond has a profile which is flat and in contact with the binder on the surface of the substrate, the diamond used is a synthetic diamond and has a regular profile. The artificial diamond is prepared at high temperature and high pressure, has a regular profile, and is more suitable for the process than natural diamond.
According to the preparation method of the diamond grinding disc for steel grinding, diamond abrasive grains are welded on the surface of a grinding disc steel matrix in a brazing mode to prepare the diamond grinding disc, and the granularity of diamond is guaranteed to be in a granularity floating interval through screening of the abrasive grains so as to guarantee that the depths of scratches on the processed surface are basically consistent. And secondly, pre-flattening the abrasive particles to control the surface flatness of the diamond abrasive particles.
Because the screening interval of the normal distribution of the conventional diamond particles has the national standard, for example, the screening interval is between 30 meshes and 80 meshes, and can be generally divided into standard particle size intervals of 30/35 meshes, 35/40 meshes, 40/45 meshes, 45/50 meshes, 50/60 meshes, 60/70 meshes, 70/80 meshes and the like. However, according to the particle size distribution in this interval, it can be seen that for 30/35 mesh, the size range of the particle size is 0.500-0.600 mm, the maximum particle size is 20% larger than the minimum particle size, which reaches the limit value required by the invention, and this value is not the optimal value, theoretically, the smaller this value is the better, and the better value is 10% in order to achieve the balance between performance and economy. In order to realize secondary screening of the average grain size of the abrasive grains, a mesh screen with a customized mesh size can be selected for operation, the grain size distribution of the abrasive grains is normally distributed, the abrasive grains need to float within 10% according to the requirement of an optimal value, part of fine grains and part of coarse grains need to be screened, and the larger grains and the smaller grains which are screened and removed can be considered to be the same.
And processing and removing the steel materials by using the firmly welded diamond, wherein the abrasive particles are subjected to leveling treatment in a pre-flattening manner before welding. The diamond on the surface of the grinding disc is selected in a narrow granularity range, and a pre-flattening process is carried out before brazing.
The invention adopts a pre-flattening process to ensure the equal height of the abrasive particles. The pre-flattening process refers to a process of making abrasive particles basically equal in height and flush in cutting edges before vacuum brazing of a grinding disc in the preparation process of the diamond tool, wherein one plane of the abrasive particles is vertical to the normal direction of a matrix, and the morphology of the abrasive particles is still maintained after brazing. Through the pre-flattening process, the damage of grinding to the abrasive particles and the grinding cost are reduced, the preparation efficiency and the economy are improved, and the better selection matching effect is realized on the optimal appearance of the abrasive particles.
The abrasive particles are basically equal in height, so that the contact area of the abrasive particles and the material is a plane, and the load borne by the abrasive particles is small.
The pre-flattening process comprises the following steps:
(1) coating a binder capable of adhering abrasive particles to the surface of the steel matrix on the surface of the millstone steel matrix;
(2) diamond abrasive grains are distributed on the binder.
(3) A pressing plate with a dense and hard surface is placed on the grinding disc distributed with the diamond abrasive particles, and the diamond abrasive particles are in direct contact with the pressing plate.
(4) And applying load to the pressure plate to enable the diamond abrasive particles to rotate under the stress condition, and ensuring that the slave surface is a plane and is in contact with the pressure plate.
(5) And (5) checking the surface morphology of the diamond abrasive particles, and if the surface morphology of the diamond abrasive particles does not meet the requirement, continuing repeating the steps 1-4.
After the steps are carried out, the brazing diamond grinding disc for steel grinding with uniform granularity and smooth surface can be obtained by arranging the welding flux, brazing and heating.
Since the particle size screening is carried out in the previous step, the average particle size of the abrasive particles is in a narrow range, and the diamonds are generally in a regular polyhedron structure and are approximately symmetrical, when a certain plane of the abrasive particles faces upwards, the height difference of the abrasive particles on the surface of the grinding disc in the direction vertical to the surface of the base body can be considered to be in a difference range of not more than 10%, and therefore, the equal height of the abrasive particles on the surface of the grinding disc is controlled.
As an improvement, the thickness of the binder is 5% -15% of the average grain size of the arranged diamonds; in the abrasive particle pre-flattening process, abrasive particles are distributed on the surface of a base body according to the landform requirement, the heights of the abrasive particles and the direction of a cutting edge are basically randomly distributed due to the binding force of a binding agent and the backing effect, the direction of the cutting edge of the abrasive particles is changed by pressing with a pressing plate, the cutting edge of a large abrasive particle is flattened, small abrasive particles are not affected, and the purpose of pre-flattening is basically achieved. The thickness of the binder is 5% -15% of the average grain diameter of the arranged diamond; the adhesive can ensure that diamond abrasive particles are adhered to the surface of the grinding disc base body, and the grinding disc base body is kept in a flattened state after the abrasive particles are flattened, so that the flattened state of the abrasive particles can be maintained during brazing and heating after the grinding disc is manufactured.
As a further improvement, a spacing plate is bonded on the grinding disc base body before the abrasive particles are distributed; the spacing plate can be used for spacing the abrasive particles of a single particle or spacing the abrasive particles of a plurality of particles.
Because the diamond abrasive grains on the surface of the grinding disc have certain topographic requirements during arrangement, the distribution of the diamond abrasive grains on the surface of the grinding disc can be in a single-grain state or can be in cluster-like distribution of a plurality of abrasive grains. And when the spacing plate exists, the abrasive particles are pressed flatly, the displacement is small, and the moving space of the abrasive particles is limited by the gap of the spacing plate, so that the surface and the landform of the abrasive particles in the pressing process can be effectively prevented from being influenced by the process. Of course, when the preparation requirement is lower on the topographic requirement of the surface of the grinding disc, the diamond can be leveled by directly utilizing the pressing plate without using the spacing plate.
The thickness of the spacing plate ranges from 40% to 80% of the average grain diameter of the arranged diamonds.
In order to prevent the diamond from shifting, the spacing plate is used for spacing the diamond, the thickness of the spacing plate cannot be too thin on one hand, so that diamond particles can not cross the spacing plate and roll to other positions when shifting, and on the other hand, the thickness of the spacing plate cannot be too thick, so that the diamond particles cannot be pressed on the surface of the diamond and can not touch the surface of the spacing plate when the pressure plate applies pressure.
The shape of the pressure plate can be pure flat, and the diamond at the flattening part is kept tangent with the pressure plate through the inclination angle of the rotary grinding disc. The platen may also be shaped to complement the abrasive disc, with the diamond on the surface of the disc contacting the platen surface by applying a load in the vertical direction.
When the abrasive grains are loaded to enable the plane to face upwards, two operation modes can be provided, one mode is that the pressing plate is in a pure flat state, the diamond at the flattening part and the pressing plate are kept in a tangent state through rotating the grinding disc along the inclination angle of the central axis of the grinding disc, the grinding disc is required to be operated in the state, when the grinding disc is in the pure plane, the plane pressing plate is pressed vertically, when the surface of the grinding disc is in an inclined plane or arc surface shape, the grinding disc is required to adjust the angle of applied pressure according to the included angle between the tangent line of the contact point when the grinding disc is in contact with the pressing plate and the plane pressing plate, and therefore the stress direction of the abrasive grains is ensured to be the normal direction of the surface of the matrix where the abrasive grains are located.
Of course, the pressing plate can also be made to have a shape complementary to the grinding disc, and the diamond on the surface of the grinding disc is made to contact with the surface of the pressing plate by applying a load in a vertical direction, so that the pressing mode is simple and easy to operate, but the design of the pressing plate is required to be matched with the shape of the grinding disc, and certain requirements are made on the design and preparation of the pressing plate.
The cross section of the diamond part arranged on the surface of the grinding disc substrate can be a plane, an arc surface, an inclined surface or a combination of the three parts. When the diamond grinding disc grinds steel materials, the shapes of workpieces are various, so that the grinding disc can be in various structures, a plane structure, an arc surface structure, an inclined plane structure or a combination of three geometrical profiles, and the pre-flattening process is not limited by the surface shape of the grinding disc and can be suitable.
The applied load is no greater than 80% of the individual hydrostatic strength of the diamonds on which the discs are arranged. Although the diamond is very hard, the diamond still has a certain strength range, in the process of flattening the diamond by the pressing plate, the applied pressure is not suitable to be increased to exceed the range of the compression strength of the diamond, and by combining the characteristic design of the abrasive particles and the pressing plate, when the pressure is applied, the abrasive particles can be effectively flattened by not more than 80% of the single static pressure strength of the diamond.
The invention realizes abrasive grain flattening of the diamond grinding disc before brazing, can still ensure the state of the upward molded surface after welding, achieves the purpose of flattening process after welding of the conventional diamond tool, and has simple process and low cost, thereby being an economic and effective novel preparation process.
The diamond grinding disc prepared by the pre-flattening process has the advantages of high grinding precision, uniform abrasive particle stress and long service life, can be effectively applied to the grinding, deburring and other processing of steel materials, is simple in particle screening and pre-flattening process operation, low in cost, low in equipment requirement and high in economical efficiency, and can effectively realize the batch stable preparation of the brazed diamond grinding disc for steel grinding.
The novel diamond grinding disc for steel grinding can be applied to the grinding and polishing processes of steel materials such as metal, cast iron, general strength steel, carbon steel, alloy steel and the like. In addition, the invention can also be applied to polishing non-metallic materials such as polysilicon, glass and the like and stone materials such as marble, granite and the like.
Drawings
FIG. 1: distribution state diagram of abrasive particle cutting edge on the tool surface.
FIG. 2: comparison graph of abrasive grain cluster shapes before and after pre-pressing flattening
The figure a shows the appearance of 40-mesh abrasive particles in an abrasive particle cluster prepared by the traditional arrangement process, and the appearance of the single abrasive particles in the figure shows that the abrasive particles are randomly distributed without certain directionality, and the top ends of the cutting edges of part of the abrasive particles face upwards and are easy to be subjected to larger shearing stress. And the graph b is the brazing appearance of the surface of the abrasive particle cluster after being pre-flattened, as can be seen from the graph, the abrasive particles are basically equal in height, the top surface is a plane and is basically flush, and the abrasive particles are all provided with a profile positioned at the top end when being observed from the top of the abrasive particle cluster, so that the design requirement is met.
Because the bottom of the abrasive particle is adhered by the adhesive and the position of the abrasive particle is fixed, when the abrasive particle is pressed, the position of the abrasive particle is slightly changed in the horizontal direction when the abrasive particle reaches the position shown in the drawing b from the drawing a, and the position of the spacing plate is determined, so the design of the landform of the abrasive particle is not influenced.
FIG. 3: schematic diagram of abrasive particle pre-flattening process
Detailed Description
Detailed description of the preferred embodiment example 1
A method for preparing a brazing diamond grinding disc for polishing rusts on the surface of carbon steel and the surface of the carbon steel.
The scheme design and steps are as follows:
(1) because the carbon steel surface is required to be polished, the removal amount is small, and the polished surface is expected not to have obvious scratches, the diamond granularity cannot be too large, and the granularity interval is floated within 20 percent. Therefore, yellow river cyclone HSD80 grade 50/60 mesh artificial diamond is selected, the diamond granularity in the interval is 0.25 mm-0.30 mm, and the requirement of granularity is met.
(2) The diamonds adopt a dot array mode on the surface of the grinding disc, a spacing plate with the thickness of 0.2mm is used as a space, and small holes are punched on the diamond distribution part through laser drilling.
(3) The base body is a disk body prepared by machining a 45 steel machine, the diamond distribution part is of a plane structure and an inclined plane structure, and the surface is subjected to deoiling and decontamination treatment and is dried for later use.
(4) The binder adopts oily acrylate and acetone, and adopts the following formula: 3, and uniformly brushing the mixture on the surface of the substrate.
(5) The spacing plate is attached to the surface of the steel substrate, and then the artificial diamond is sprayed in the small holes of the spacing plate.
(6) Alumina ceramic with the purity of 96 percent is used as a pressure plate, processed into a shape which is complementary with the surface structure of the matrix and attached to the surface of a grinding disc on which diamonds are distributed.
(7) A pressure of 10kg was applied vertically to the platen and a slight rotation moved the tips of the abrasive particles to become profile up.
(8) And removing the pressing plate and the spacing plate, and basically flattening the diamond profile.
(9) Spraying nickel-based alloy solder, and performing vacuum brazing by using a vacuum brazing furnace. And (4) carrying out vacuum brazing at 1025 ℃ and keeping the temperature for 15 min.
Detailed description of the preferred embodiment example 2
A method for preparing a brazing diamond flat grinding disc for polishing and casting surface burrs and risers.
The scheme design and steps are as follows:
(1) because the cast steel surface is required to be polished, burrs need to be polished, and the dead head needs to be cut and ground, the planar grinding disc is most suitable to be used. Because the machining allowance is large, the machining efficiency is expected to be high, the surface is not required to have obvious scratches after being polished, the diamond granularity cannot be too small, and the granularity interval floating is ensured to be within 15 percent as much as possible. Therefore, yellow river cyclone HSD80 grade 35/40 mesh artificial diamond is selected, the diamond granularity in the interval is 0.425 mm-0.500 mm, the range interval is more than 15% and less than 20%, secondary screening is carried out on the granularity for further controlling the precision, and the granularity range is controlled to be 0.45 mm-0.50 mm.
(2) Because the burr and riser of polishing mostly adopt mill edge and inclined plane to polish, the diamond adopts the mode of even densely covered on mill surface.
(3) The base member adopts 45 steel machine tooling preparation disk body, and the diamond portion of arranging is little cambered surface structure, and the surface is deoiled, decontamination treatment, dries for use.
(4) The binder adopts oily acrylate and acetone, and adopts the following formula: 2.5, and uniformly brushing the mixture on the surface of the matrix.
(5) Alumina ceramic with the purity of 96% is used as a pressing plate, and the pressing plate is of a pure flat structure.
(7) The grinding disc is clamped, the edge of the grinding disc is in contact with the pressure plate, 10kg of pressure is applied along the vertical direction of the pressure plate, and the pressure plate is always perpendicular to the normal direction of the contact point of the grinding disc according to the cambered surface structure and the inclination angle of the grinding disc.
(8) And after the pressure is applied, the pressing plate and the spacing plate are removed, and the diamond profile is basically flattened.
(9) Spraying nickel-based alloy solder, and performing vacuum brazing by using a vacuum brazing furnace. And (4) carrying out vacuum brazing at 1025 ℃ and keeping the temperature for 15 min.
Claims (12)
1. The brazing diamond grinding disc for steel grinding is characterized in that the granularity interval of diamond particles of the brazing diamond grinding disc is 20-120 meshes, the particle size floating range of the diamond particles of a single diamond grinding disc is not more than 20%, namely the ratio of the maximum value to the minimum value of the particle size of the diamond abrasive particles on the surface of the same grinding disc is not more than 20%; the diamond cutting edges are flush, the top ends of the diamond abrasive particles are kept to be profiles, and the profiles are perpendicular to the normal direction of the matrix;
the preparation method of the brazed diamond grinding disc for steel grinding comprises the steps of welding diamond abrasive grains on the surface of a grinding disc steel matrix in a brazing mode to prepare the brazed diamond grinding disc, and firstly, screening the abrasive grains to ensure that the granularity of diamond is within the grain size range of the diamond so as to ensure that the depths of scratches on the processed surface are basically consistent; secondly, controlling the surface flatness of the diamond abrasive particles by abrasive particle pre-flattening;
the pre-flattening process refers to a process of enabling abrasive particles to be basically equal in height and have flush cutting edges before a grinding disc is subjected to vacuum brazing in the preparation process of the diamond tool, enabling the top ends of the abrasive particles to be a plane and perpendicular to the normal direction of a matrix, and keeping the shape of the abrasive particles after brazing.
2. The brazed diamond grinding disc for steel grinding according to claim 1, wherein the maximum value of the grain size of the diamond abrasive grains is not more than 10% larger than the minimum value.
3. The brazing diamond grinding disc for steel grinding according to claim 1, wherein the cross-sectional shape of the diamond part arranged on the surface of the grinding disc substrate is a plane, an arc surface, an inclined surface or a combination of the three parts.
4. The brazing diamond grinding disc for steel grinding according to claim 1, wherein the outer diameter of the grinding disc is in the range of: 80 mm-230 mm.
5. The brazed diamond grinding disc for steel grinding according to claim 1, wherein the diamond is a synthetic diamond crystal with a regular profile.
6. The method of making a brazed diamond grinding disc for steel grinding according to any of claims 1 to 5, wherein the pre-flattening process is:
(1) coating a binder capable of adhering abrasive particles to the surface of the steel matrix on the surface of the millstone steel matrix;
(2) diamond abrasive grains are distributed on the adhesive;
(3) a pressing plate with a dense and hard surface is placed on the grinding disc distributed with diamond abrasive grains, and the diamond abrasive grains are directly contacted with the pressing plate;
(4) applying a load to the pressing plate to enable the diamond abrasive particles to rotate under the stress condition, so that a plane is ensured to be in contact with the pressing plate;
(5) checking the surface morphology of the diamond abrasive particles, and if the surface morphology does not meet the requirements, continuing repeating the steps 3-4;
after the steps are carried out, the brazing diamond grinding disc for steel grinding with uniform granularity and smooth surface can be obtained by arranging the welding flux, brazing and heating.
7. The method of claim 6, wherein the binder has a thickness of 5% to 15% of the average grain size of the arranged diamonds.
8. The method of claim 6, wherein a spacer plate is bonded to the disc substrate prior to dispensing the abrasive particles; the spacer plate can separate the abrasive grains of a single grain or separate the abrasive grains of a plurality of grains.
9. The method of claim 8, wherein the spacer plate has a thickness in the range of 40% to 80% of the average diameter of the diamond arranged.
10. The method of claim 7 or 8, wherein the platen is substantially flat, and wherein the diamond at the flattening area is maintained tangential to the platen by rotating, moving or tilting the disc, and wherein the load is applied in a direction perpendicular to the tangential direction.
11. The method of claim 7 or 8, wherein the platen is shaped to complement the abrasive disc, and wherein the diamond particles are pressed to a profile facing upward by applying a load in a vertical direction such that the platen surface contacts the diamond particles on the surface of the abrasive disc.
12. The method of claim 6, wherein the applied load is no greater than 80% of the single hydrostatic strength of the diamonds on which the discs are arranged.
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| CN113618648B (en) * | 2021-08-18 | 2022-08-16 | 全立传感科技(南京)有限公司 | Preparation method of regular fine diamond particle grinding tool |
| CN113977467A (en) * | 2021-10-29 | 2022-01-28 | 江苏韦尔博新材料科技有限公司 | Preparation method of brazed diamond dresser for chemical mechanical polishing |
| CN114083452A (en) * | 2021-11-11 | 2022-02-25 | 深圳市前海科创石墨烯新技术研究院 | Method and tool for manufacturing small trimming disc ingot |
| CN115026730B (en) * | 2022-07-11 | 2024-03-01 | 河北锟洲科技有限公司 | Roller diamond arrangement implantation method based on 3D printing |
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| US7124753B2 (en) * | 1997-04-04 | 2006-10-24 | Chien-Min Sung | Brazed diamond tools and methods for making the same |
| CN102059423B (en) * | 2010-11-30 | 2012-11-21 | 中原工学院 | Method for manufacturing diamond tool with self-lubrication function |
| CN102896590B (en) * | 2012-09-21 | 2015-03-11 | 南京航空航天大学 | Process for distributing grinding materials of grinding disc of ship body made of brass solder super-hard grinding material |
| CN104070469B (en) * | 2014-06-19 | 2017-04-26 | 南京航空航天大学 | Multi-abrasive collaborative arrangement process based on hole template technology |
| CN107520770B (en) * | 2017-05-04 | 2019-03-08 | 漳州职业技术学院 | A kind of wear-resisting skive preparation method of abrasive grain crystal orientation distribution |
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