CN113635213B - Enhanced honing emery stick and preparation method thereof - Google Patents
Enhanced honing emery stick and preparation method thereof Download PDFInfo
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- CN113635213B CN113635213B CN202110954443.4A CN202110954443A CN113635213B CN 113635213 B CN113635213 B CN 113635213B CN 202110954443 A CN202110954443 A CN 202110954443A CN 113635213 B CN113635213 B CN 113635213B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B33/00—Honing machines or devices; Accessories therefor
- B24B33/08—Honing tools
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
- B24D18/009—Tools not otherwise provided for
Abstract
The invention provides a diamond enhanced emery stick for cylinder sleeve honing, which is used for discharging in honing country VI, wherein cerium oxide with a polishing effect is used as a filler, so that the integral hardness of the emery stick is improved, the threshing uniformity of abrasive grain diamond is ensured, the evenness of reticulate patterns is ensured, metal folding is reduced, the roughness of a core part is smoother, the ratio of Rvk/Rk is improved, the oil storage effect is better, and the better honing effect is achieved. The invention uses cerium oxide with polishing effect, so that the inner surface of the cylinder sleeve has certain rapid polishing effect in the honing process; the integral hardness of the abrasive bars is improved, the diamond abrasive grains are threshed more uniformly during honing, the metal folding phenomenon rarely exists, and the reticulate patterns are more uniform; the sintering process adopts a three-step sintering method, so that the sintering is more complete and the particle distribution is more uniform. The invention also provides a preparation method of the enhanced honing emery stick.
Description
Technical Field
The invention belongs to the technical field of grinding materials, and particularly relates to an enhanced honing emery stick and a preparation method thereof.
Background
With the increasing requirements of the country on the engine displacement, the engine with national V displacement is stopped from the next half year of 2021, so that new requirements are also put forward to the cylinder sleeve industry, the honing reticulate pattern of the cylinder sleeve must meet or exceed the new requirements of national VI displacement, the honing sand used in the past is a silicon carbide sand strip or a diamond sand strip, the honing particles are diamond or silicon carbide, and the bonding part usually uses copper powder and tin powder to ensure rapid sintering and uniform threshing during honing. Cobalt powder and silver powder are added for reducing sintering temperature, and iron powder is added for reducing cost. No matter which bonding material, all only play quick bonding effect or the effect of threshing easily when the honing, its bonding part's hardness is on the low side, and the life of emery stick is shorter, simultaneously because the bonding material that bonding part used does not basically have the grinding and polishing effect, because thresh sooner, the random line of appearance of regularity makes the reticulation after the honing not reach national VI standard requirement, is difficult to satisfy national VI or is higher than the requirement of national VI reticulation.
Disclosure of Invention
In view of the above, the present invention provides an enhanced honing stick and a preparation method thereof, and the enhanced honing stick provided by the present invention can improve the qualification rate of honing reticulate patterns of a cylinder liner, so that the emission of the enhanced honing stick meets or exceeds the requirement of the country VI.
The invention provides an enhanced honing emery stick, which comprises:
cobalt powder: 2.5 to 4.5 weight percent,
copper powder: 35 to 45 weight percent of the total weight of the mixture,
tin powder: 12 to 16 weight percent of the total weight of the mixture,
cerium oxide: 12 to 18 weight percent of the total weight of the alloy,
cerium fluoride: 2 to 3 weight percent;
the balance being diamond.
Preferably, the particle size of the cobalt powder, copper powder, tin powder, cerium oxide and cerium fluoride is less than 100 micrometers.
Preferably, the diamond has a particle size of D76.
Preferably, the hardness of the enhanced honing emery stick is 100-120 HRE.
Preferably, the diamond distribution density in the enhanced honing emery stick is 85-110 diamond/mm 2 。
The invention provides a preparation method of an enhanced honing emery stick in the technical scheme, which comprises the following steps:
and mixing, die filling and sintering cobalt powder, copper powder, tin powder, cerium oxide, cerium fluoride and diamond to obtain the enhanced honing emery stick.
Preferably, the sintering method comprises:
and sintering and forming by using vacuum hot-pressing sintering.
Preferably, the sintering is performed under vacuum; the vacuum degree of the vacuum is 180-220 Pa.
Preferably, the sintering method comprises:
sequentially carrying out first-stage sintering, second-stage sintering and third-stage sintering by using a stepped sintering forming method;
the pressure of the first stage sintering, the second stage sintering and the third stage sintering is 35-38 MPa.
Preferably, the sintering temperature of the first stage is 330-370 ℃, and the heat preservation time is 3-7 min;
the temperature of the second stage sintering is 530-570 ℃, and the heat preservation time is 3-7 min;
the temperature of the third stage sintering is 700-750 ℃, and the heat preservation time is 8-12 min.
The invention utilizes the grinding effect of diamond, the sintering and forming effect of copper powder, tin powder and cobalt powder, the filling effect of cerium oxide and cerium fluoride and the polishing and hardening effect of cerium oxide, thereby achieving the improvement of the quality and effect of honing reticulate patterns and meeting or exceeding the requirement of state VI reticulate patterns. The discharge of the cylinder sleeve honed by the abrasive band can reach or even exceed the requirement of national VI standard, the reticulate pattern of the cylinder sleeve is clear and fine, the folding and disordering phenomena are not generated, all parameters are stable, and powerful guarantee is provided for the engine which can realize national VI discharge in 2021 year.
Drawings
FIG. 1 is a microscopic image of the diamond density of a sand bar prepared in example 1 of the present invention;
FIG. 2 is an SEM image of a fracture of a sand bar prepared in example 1 of the present invention;
FIG. 3 is an SEM image of the cross-hatched surface of a cylinder liner honed by the sand strip prepared in example 3 of the present invention;
FIG. 4 is a cross-hatched contour diagram of a cylinder liner honed sand strip prepared in example 2 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other examples, which may be modified or appreciated by those of ordinary skill in the art based on the examples given herein, are intended to be within the scope of the present invention. It should be understood that the embodiments of the present invention are only for illustrating the technical effects of the present invention, and are not intended to limit the scope of the present invention. In the examples, the methods used were all conventional methods unless otherwise specified.
The invention provides an enhanced honing emery stick, which comprises:
cobalt powder: 2.5 to 4.5 weight percent,
copper powder: 35 to 45 weight percent of the total weight of the alloy,
tin powder: 12 to 16 weight percent of the total weight of the mixture,
cerium oxide: 12 to 18 weight percent of the total weight of the mixture,
cerium fluoride: 2 to 3 weight percent;
the balance being diamond.
In the present invention, the cobalt powder preferably has a mass content of 3 to 4%, more preferably 3.5%.
In the present invention, the particle size of the cobalt powder is preferably 100 micrometers or less, more preferably 80 to 100 micrometers, and most preferably 90 micrometers.
In the present invention, the mass content of the copper powder is preferably 38 to 42%, more preferably 40%.
In the present invention, the particle size of the copper powder is preferably 100 μm or less, more preferably 80 to 100. Mu.m, and most preferably 90 μm.
In the present invention, the mass content of the tin powder is preferably 13 to 15%, more preferably 14%.
In the present invention, the particle size of the tin powder is preferably 100 micrometers or less, more preferably 80 to 100 micrometers, and most preferably 90 micrometers.
In the present invention, the content of the cerium oxide is preferably 13 to 17% by mass, more preferably 14 to 16% by mass, and most preferably 15% by mass.
In the present invention, the particle size of the cerium oxide is preferably 100 μm or less, more preferably 80 to 100 μm, and most preferably 90 μm.
In the present invention, the mass content of cerium fluoride is preferably 2.2 to 2.8%, more preferably 2.4
-2.6%, most preferably 2.5%.
In the present invention, the particle size of the cerium fluoride is preferably 100 micrometers or less, more preferably 80 to 100 micrometers, and most preferably 90 micrometers.
In the present invention, the diamond preferably has a particle size of D76, more preferably 65 to 85 microns, more preferably 70 to 80 microns, and most preferably 75 microns.
In the invention, the length of the enhanced honing emery stick is preferably 120-160 mm, more preferably 130-150 mm, and most preferably 140mm; the width is preferably 2 to 4mm, more preferably 2.5 to 3.5mm, most preferably 3mm; the height is preferably 4 to 8mm, more preferably 5 to 7mm, most preferably 6mm.
In the invention, the hardness of the enhanced honing emery stick is preferably 100-120 HRE, more preferably 105-115 HRE and most preferably 110HRE. .
In the invention, the diamond distribution density in the enhanced honing emery stick is preferably 85-110 diamond/mm 2 More preferably 90 to 105 pieces/mm 2 Most preferably 95 to 100 pieces/mm 2 。
The invention provides a preparation method of an enhanced honing emery stick in the technical scheme, which comprises the following steps:
and mixing, die filling and sintering cobalt powder, copper powder, tin powder, cerium oxide, cerium fluoride and diamond to obtain the enhanced honing emery stick.
In the present invention, the usage ratio and the particle size of the cobalt powder, the copper powder, the tin powder, the cerium oxide, the cerium fluoride and the diamond are the same as those described in the above technical solution, and are not described herein again.
In the present invention, the mixing is preferably carried out in a mixer; the mixing time is preferably 25 to 35 minutes, more preferably 28 to 32 minutes, most preferably 30 minutes to ensure adequate mixing.
In the present invention, the method of die-filling preferably comprises:
weighing a mixed product with the same mass as that of the required sand strip, filling the mixed product into a mold, and covering the mold.
In the present invention, the method of sintering preferably comprises:
and sintering and forming by using vacuum hot-pressing sintering.
In the present invention, the sintering is preferably performed in a vacuum hot-press sintering furnace.
In the present invention, the sintering is preferably performed under vacuum; the degree of vacuum of the vacuum is preferably 180 to 220Pa, more preferably 190 to 210Pa, and most preferably 200Pa.
In the present invention, the method of sintering preferably comprises:
the first stage sintering, the second stage sintering and the third stage sintering are sequentially performed by using a step sintering molding method.
In the present invention, the pressure of the first stage sintering, the second stage sintering and the third stage sintering is preferably 35 to 38MPa, and more preferably 36 to 37MPa.
In the present invention, the temperature of the first stage sintering is preferably 330 to 370 ℃, more preferably 340 to 360 ℃, and most preferably 350 ℃; the holding time is preferably 3 to 7min, more preferably 4 to 6min, and most preferably 5min.
In the present invention, the temperature of the second stage sintering is preferably 530 to 570 ℃, more preferably 540 to 560 ℃, and most preferably 550 ℃; the holding time is preferably 3 to 7min, more preferably 4 to 6min, and most preferably 5min.
In the invention, the temperature of the third stage sintering is preferably 700-750 ℃, more preferably 710-740 ℃, and most preferably 720-730 ℃; the holding time is preferably 8 to 12min, more preferably 9 to 11min, and most preferably 10min.
In the invention, the sintering process is preferably carried out by starting heating and carrying out hot press molding when the pressure reaches 6 MPa.
In the invention, before sintering, the mould filled with the mixed product is preferably placed in a vacuum hot-pressing sintering furnace, a screw is screwed tightly to compress the sample, and a cover door is closed.
In the present invention, before the sintering, a vacuum is preferably performed, and the vacuum method preferably includes:
and opening a vacuum pump switch, and closing an exhaust valve when the vacuum degree reaches 200Pa.
In the present invention, it is preferable that the sintering further includes:
and cooling and demolding the sintered product.
In the present invention, the method of cooling and demolding preferably comprises:
and opening the water cooling machine, cooling the mold, and taking out the sand bars after complete cooling.
In the present invention, after obtaining the sand strip, it is preferable to further include:
and (5) trimming the sand strip.
In the present invention, the dressing is preferably performed on a grinder.
In the present invention, it is preferable that the finishing is completed by further including:
and detecting the hardness and the diamond density distribution of the trimmed sand bars.
In the present invention, the method for detecting hardness is preferably a rockwell hardness tester; the diamond density detection method is preferably a microscope.
In the invention, the preparation method of the enhanced honing emery stick preferably comprises the following steps:
respectively weighing cobalt powder, copper powder, tin powder, cerium oxide, cerium fluoride and diamond according to the mass ratio, putting the cobalt powder, the copper powder, the tin powder, the cerium oxide, the cerium fluoride and the diamond into a mixer, starting the mixer to mix for 30 minutes, and ensuring full mixing to obtain a mixture;
weighing a mixture with the same mass as the required sand strips, filling the mixture into a mold, and covering the mold;
putting the mold filled with the mixture into a corresponding position in a vacuum hot-pressing sintering furnace, screwing a screw to compress the sample, and closing a cover door;
opening a vacuum pump switch, and closing an exhaust valve when the vacuum degree reaches 200 Pa;
a step sintering forming method is used, the pressure is set to be 35-38 MPa, the temperature is set to be 350 ℃ in the first stage, the temperature is kept for 5min, 550 ℃ in the second stage, the temperature is kept for 5min, 730 ℃ in the third stage, and the temperature is kept for 10min;
after the setting is finished, a switch of the press machine is turned on, and when the pressure reaches 6MPa, a switch power supply of a temperature control system is turned on, and hot-press molding is carried out;
after the hot press molding is finished, opening the water cooling machine, cooling the mold, and taking out the sand bars after the sand bars are completely cooled, wherein the sand bars are 140mm long, 3mm wide and 6mm high;
finishing and polishing the sand bars on a grinding machine;
hardness was measured using a rockwell hardness tester; the distribution density of diamond was measured using a microscope.
The invention utilizes the grinding effect of diamond, the sintering and forming effect of copper powder, tin powder and cobalt powder, the filling effect of cerium oxide and cerium fluoride and the polishing and hardening effect of cerium oxide, thereby achieving the improvement of the quality and effect of honing reticulate patterns and meeting or exceeding the requirement of state VI reticulate patterns. The emission of the cylinder sleeve honed by the abrasive bars provided by the invention can reach or even exceed the requirements of national VI standards, the reticulate pattern of the cylinder sleeve is clear and exquisite, folding and random pattern phenomena are not generated, all parameters are stable, and powerful guarantee is provided for engines which can realize national VI emission in 2021 years.
Example 1
The embodiment provides an enhanced honing emery stick, which comprises the following components in percentage by mass: cobalt powder: 3.0%, copper powder: 40%, tin powder: 15%, cerium oxide: 15%, cerium fluoride: 2.3 percent, and the granularity of the components is less than 100 mu m; the balance of diamond, and the granularity adopts D76.
The preparation method comprises the following steps:
1. mixing materials: weighing the materials according to the proportion, and then putting the materials into a mixer for mixing for 30min.
2. Die filling: and weighing the mixed materials by the same weight as that of the required finished sand strip, putting the mixed materials into a sand strip mould, and covering the mould for later use.
3. Hot-press molding: putting the mould filled with the mixed materials of the sand bars into a vacuum hot-pressing sintering furnace for sintering and forming, wherein the specific operation and parameters are as follows:
placing a sample: putting the mold filled with the mixture into a corresponding position in the furnace, screwing a compression screw to compress the sample, and closing a cover door;
vacuumizing: at the moment, a vacuum pump switch is opened, and when the vacuum degree reaches 200Pa, the air escape valve is screwed;
setting pressure, temperature and heat preservation time: setting the pressure at 38MPa, setting the temperature at 350 ℃ in the first stage, keeping the temperature for 5min, setting the temperature at 550 ℃ in the second stage, keeping the temperature for 5min, setting the temperature at 730 ℃ in the third stage, and keeping the temperature for 13min;
pressurizing: after the setting is finished, a switch of the press machine is turned on, and when the pressure reaches 6MPa, a switch power supply of a temperature control system is turned on, and hot-press molding is carried out;
cooling and demolding: and after the hot press molding is finished, opening a water cooling machine, cooling the sand strip mold, and taking out the sand strip after the sand strip mold is completely cooled, wherein the sand strip is 140mm long, 3mm wide and 6mm high.
4. Trimming: and finishing and polishing the sand bars on a grinding machine.
5. And (3) detection: hardness was measured using a rockwell hardness tester, and the measurement result was HRE:112, a first electrode;
measuring the distribution density of the diamond by using a microscope, and detecting the distribution density of the diamond to be 101/mm 2 。
The surface of the sand strip prepared in example 1 of the present invention was examined by means of a Scheink VHX-2000 ultra-depth microscope, and the examination results are shown in FIG. 1, from which the number of diamond particles can be seen in FIG. 1.
The fracture of the sand bar prepared in example 1 was detected by a german zeiss EVO18 type scanning electron microscope, and the detection result is shown in fig. 2, and the bonding condition of the diamond and the adhesive and the polyhedral shape of the diamond can be seen from fig. 2.
Example 2
The embodiment provides an enhanced honing emery stick which comprises the following components in percentage by mass: cobalt powder: 3.5%, copper powder: 36%, tin powder: 18%, cerium oxide: 12%, cerium fluoride: 2.5 percent, and the granularity of the components is below 100 mu m; the balance of diamond, and the granularity adopts D76.
The preparation method comprises the following steps:
1. mixing materials: weighing the materials according to the proportion, and then putting the materials into a mixer for mixing for 30min.
2. Die filling: and weighing the mixed materials, putting the mixed materials into a sand bar die, and covering the die for later use, wherein the weight of the mixed materials is equal to that of the sand bar finished product.
3. Hot-press molding: and (3) putting the mould filled with the sand bar mixed material into a vacuum hot-pressing sintering furnace for sintering and forming, wherein the specific operation and parameters are as follows:
sample placement: putting the mold filled with the mixture into a corresponding position in the furnace, screwing the compression screw to compress the sample, and closing the cover door;
vacuumizing: opening a vacuum pump switch, and screwing the air escape valve when the vacuum degree reaches 200 Pa;
setting pressure, temperature and heat preservation time: setting the pressure at 35MPa, setting the temperature at 350 ℃ in the first stage, keeping the temperature for 5min, setting the temperature at 550 ℃ in the second stage, keeping the temperature for 5min, setting the temperature at 750 ℃ in the third stage, and keeping the temperature for 10min;
pressurizing: after the setting is finished, a switch of the press machine is turned on, and when the pressure reaches 6MPa, a switch power supply of a temperature control system is turned on, and hot-press molding is carried out;
cooling and demolding: and after the hot press molding is finished, opening a water cooling machine, cooling the sand strip mold, and taking out the sand strip after the sand strip mold is completely cooled, wherein the sand strip is 140mm long, 3mm wide and 6mm high.
4. Trimming: and finishing and polishing the sand bars on a grinding machine.
5. And (3) detection: hardness was measured using a rockwell hardness tester, and the measurement results were: HRE:107;
the distribution density of diamond was measured using a microscope: the detection result is 97/mm 2 。
The emery stick prepared in the embodiment 2 is installed on a honing machine to hone a cylinder sleeve, the honing equipment is the honing machine, the honing emery stick is installed on a honing head, the cylinder sleeve (heavy steam MC 13-0497) is placed on a cylinder sleeve fixing tool of the machine, parameters such as the rotating speed, the reciprocating speed, the allowance removing pressure, the net pulling pressure, the flat top pressure and the polishing pressure of the honing head are set, and then honing is carried out; the set parameters are that the rotating speed is 102m/min, the reciprocating speed is 30m/min, the allowance removing pressure is 29MPa, the net pulling pressure is 22MPa, the flat top pressure is 16MPa, and the polishing pressure is 10MPa, and the Quick002 honing liquid is used, so that the honing effect reaches and is superior to the state VI standard reticulate pattern.
The T8000 roughness meter of Germany Huo Meier is adopted to detect the reticulate pattern contour after the cylinder sleeve is honed, and the reticulate pattern contour is detected according to GB/T3505-2009 product geometric technical Specification (GPS) surface structure contour method terms, definitions and surface structure parameters, and the reticulate pattern contour diagram is obtained through detection and is shown in figure 4.
Example 3
The embodiment provides an enhanced honing emery stick, which comprises the following components in percentage by mass: cobalt powder: 4.0%, copper powder: 42, tin powder: 13%, cerium oxide: 17%, cerium fluoride: 2.3 percent, and the granularity of the components is less than 100 mu m; the balance of diamond, and the granularity adopts D76.
The preparation method comprises the following steps:
1. mixing materials: weighing the materials according to the proportion, and then putting the materials into a mixer for mixing for 30min.
2. Die filling: and weighing the mixed material of the sand bars, putting the mixed material which is equal to the weight of the required finished sand bars into a sand bar die, and covering the die for later use.
3. Hot-press molding: putting the mould filled with the mixed materials of the sand bars into a vacuum hot-pressing sintering furnace for sintering and forming, wherein the specific operation and parameters are as follows:
placing a sample: putting the mold filled with the mixture into a corresponding position in the furnace, screwing the compression screw to compress the sample, and closing the cover door;
vacuumizing: opening a vacuum pump switch, and screwing the air escape valve when the vacuum degree reaches 200 Pa;
setting pressure, temperature and heat preservation time: setting the pressure at 35MPa, setting the temperature at 350 ℃ in the first stage, keeping the temperature for 5min, setting the temperature at 550 ℃ in the second stage, keeping the temperature for 5min, setting the temperature at 720 ℃ in the third stage, and keeping the temperature for 10min;
pressurizing: after the setting is finished, a switch of the press machine is turned on, and when the pressure reaches 6MPa, a switch power supply of a temperature control system is turned on, and hot-press molding is carried out;
cooling and demolding: and after the hot press molding is finished, opening a water cooling machine, cooling the sand strip mold, and taking out the sand strip after the sand strip mold is completely cooled, wherein the sand strip is 140mm long, 3mm wide and 6mm high.
4. Trimming: and finishing and polishing the sand bars on a grinding machine.
5. And (3) detection: hardness was measured using a rockwell hardness tester, and the measurement results were: HRE:115, 115;
the distribution density of the diamond was measured by a microscope, and the measurement result was 94 pieces/mm 2 。
The emery stick prepared in the embodiment 3 is installed on a honing machine to hone a cylinder sleeve, the honing equipment is the honing machine, the honing emery stick is installed on a honing head, the cylinder sleeve (Cummins 5483362) is placed on a cylinder sleeve fixing tool of the machine, parameters such as the rotating speed, the reciprocating speed, the allowance removing pressure, the net pulling pressure, the flat top pressure and the polishing pressure of the honing head are set, and then honing is carried out; the set parameters are that the rotating speed is 105m/min, the reciprocating speed is 28m/min, the residual removing pressure is 29MPa, the net pulling pressure is 23MPa, the flat top pressure is 15MPa, and the polishing pressure is 10MPa, and the Quick002 honing solution is used, so that the honing effect reaches and is superior to the state VI standard reticulate pattern.
And (3) detecting the reticulate pattern on the inner surface of the honed cylinder sleeve by adopting a German Zeiss EVO18 type scanning electron microscope, wherein the detection result is shown in figure 3, as can be seen from figure 3, the reticulate pattern is clear, the surface has no defects of metal fragments, cracks, inclusions and the like, and the cutting in two directions is uniform.
Performance detection
The cylinder sleeve honing is carried out by adopting the diamond emery stick and the common diamond emery stick prepared by the embodiment of the invention, the honing equipment is a honing machine, the honing emery stick is firstly arranged on a honing head, the cylinder sleeve (Yuchai J3300) is arranged on a cylinder sleeve fixing tool of the machine, the parameters of the rotation speed, the reciprocating speed, the allowance removing pressure, the net pulling pressure, the flat top pressure, the polishing pressure and the like of the honing head are set, and then the honing is carried out; the set parameters are that the rotating speed is 110m/min, the reciprocating speed is 32m/min, the residue removing pressure is 30MPa, the net pulling pressure is 20MPa, the flat top pressure is 15MPa, the polishing pressure is 10MPa, and Quicker 002 honing solution (with the viscosity of 2.5 mm) is used 2 Water/s, 0.05%) was added.
The common diamond sand strip is a product with the model number DR D76-3 produced by Dingrui company.
Detecting reticulate pattern parameters of the honed product, wherein the parameters Rz, rk, rpk and Rvk are detected according to GB/T10610 rules and methods for evaluating the surface structure by a product geometric technical specification (GPS) surface structure profile method; parameters Mr1 and Mr2 are in accordance with JB/T5082.7-2011 part 7 of the internal combustion engine cylinder liner: detecting the technical specification and the detection method of the platform honing reticulate pattern; calculating according to GB/T3505-2009 terms, definitions and surface structure parameters of surface structure contour method of product geometric technical Specification (GPS); the results are shown in table 1:
TABLE 1 comparison of the results of the reticulate pattern parameters after honing the sand bars prepared by the embodiment of the invention and the common diamond sand bars
As can be seen from Table 1, all the parameters of the emery stick honing reticulate pattern prepared by the embodiment of the invention can meet the requirements of the national VI standard, and are more stable and less in change than the parameters of the ordinary emery stick honing.
From the above examples, the present invention utilizes the grinding effect of diamond, the sintering and forming effect of copper powder, tin powder and cobalt powder, the filling effect of cerium oxide and cerium fluoride, and the polishing and hardening effect of cerium oxide, so as to improve the quality and effect of honing reticulate patterns, and meet or exceed the requirement of national VI reticulate patterns. The emission of the cylinder sleeve honed by the abrasive bars provided by the invention can reach or even exceed the requirements of national VI standards, the reticulate pattern of the cylinder sleeve is clear, fine and uniform, the phenomena of folding and random patterns do not occur, all parameters are stable, and powerful guarantee is provided for engines which can completely realize national VI emission in 2021.
While only the preferred embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (9)
1. An enhanced honing emery stick, which comprises:
cobalt powder: 2.5 to 4.5 weight percent,
copper powder: 35 to 45 weight percent of the total weight of the alloy,
tin powder: 12 to 16 weight percent of the total weight of the mixture,
cerium oxide: 12 to 18 weight percent of the total weight of the alloy,
cerium fluoride: 2 to 3 weight percent;
the balance of diamond;
the particle size of the cobalt powder, the copper powder, the tin powder, the cerium oxide and the cerium fluoride is less than 100 microns.
2. The enhanced honing stick of claim 1 wherein said diamond is of D76 grit size.
3. The enhanced honing stick of claim 1, wherein the enhanced honing stick has a hardness of 100-120 HRE.
4. The enhanced honing stick of claim 1 wherein the diamond distribution density in said enhanced honing stick is from 85 to 110 diamond/mm 2 。
5. A method of making the enhanced honing stick of claim 1, comprising:
and mixing, die filling and sintering cobalt powder, copper powder, tin powder, cerium oxide, cerium fluoride and diamond to obtain the enhanced honing emery stick.
6. The method of claim 5, wherein the method of sintering comprises:
and sintering and forming by using vacuum hot-pressing sintering.
7. The method of claim 6, wherein the sintering is performed under vacuum conditions; the vacuum degree of the vacuum is 180-220 Pa.
8. The method of claim 6, wherein the method of sintering comprises:
using a step sintering forming method to sequentially carry out first-stage sintering, second-stage sintering and third-stage sintering;
the pressure of the first stage sintering, the second stage sintering and the third stage sintering is 35-38 MPa.
9. The method according to claim 8, wherein the temperature of the first stage sintering is 330-370 ℃, and the holding time is 3-7 min;
the temperature of the second stage sintering is 530-570 ℃, and the heat preservation time is 3-7 min;
the temperature of the third stage sintering is 700-750 ℃, and the heat preservation time is 8-12 min.
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| US8308530B2 (en) * | 2009-08-31 | 2012-11-13 | Ati Properties, Inc. | Abrasive cutting tool |
| CN102233540B (en) * | 2011-04-12 | 2013-05-29 | 安泰科技股份有限公司 | Honing strip and manufacturing method thereof |
| CN102205525B (en) * | 2011-05-24 | 2012-11-14 | 河南工业大学 | Diamond resin honing stone for ultra-precisely machining cylinder sleeve platform anilox roller and preparation method thereof |
| CN102825537A (en) * | 2012-08-24 | 2012-12-19 | 河南省中原内配股份有限公司 | Efficient honing stick for cylinder sleeve |
| CN105619271B (en) * | 2015-12-25 | 2017-09-01 | 郑州磨料磨具磨削研究所有限公司 | A kind of abrasive cut-off wheel method for machining bore |
| CN106244883B (en) * | 2016-08-12 | 2018-02-16 | 中原内配集团鼎锐科技有限公司 | A kind of diamond honing abrasive belt and its preparation technology |
| CN107030617A (en) * | 2017-05-04 | 2017-08-11 | 中原内配集团鼎锐科技有限公司 | A kind of resin bonding agent diamond honing abrasive belt and preparation method thereof |
| CN111975663B (en) * | 2020-08-26 | 2021-11-02 | 苏州信能精密机械有限公司 | Oilstone for honing TB6 titanium alloy material and preparation method and application thereof |
| CN112621580B (en) * | 2020-12-17 | 2022-08-26 | 广东纳德新材料有限公司 | Composite diamond grinding block and preparation method thereof |
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2021
- 2021-08-19 CN CN202110954443.4A patent/CN113635213B/en active Active
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