CN102161183A - High-speed resin heavy-load grinding wheel - Google Patents
High-speed resin heavy-load grinding wheel Download PDFInfo
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- CN102161183A CN102161183A CN2010105170180A CN201010517018A CN102161183A CN 102161183 A CN102161183 A CN 102161183A CN 2010105170180 A CN2010105170180 A CN 2010105170180A CN 201010517018 A CN201010517018 A CN 201010517018A CN 102161183 A CN102161183 A CN 102161183A
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Abstract
The invention relates to a high-speed resin heavy-load grinding wheel and a preparation method thereof. In the method, special material formulas of an outer grinding layer, core material and a hole core are designed separately, wherein used materials include four parts, namely a binding agent which is special for a high-performance modified high-polymer-based phenolic resin grinding wheel and prepared from phenolic resin, new phenolic resin and polysulfone resin, grinding materials such as fused zirconia alumina, alumina sintering corundum and black silicon carbide, fillers such as pyrite, cryolite and calcium carbonate (lime), and reinforcing materials such as mixed fine-particle-size grinding material, fiber, steel rings (local reinforcement) and the like; and a two-phase reinforced compound technology and structure are used to prepare the high-speed resin heavy loading grinding wheel. In the invention, the tensile strength, the folding strength and the grinding rate of the grinding wheel are greatly improved; under heavy load, the grinding range condition has wide adaptability, the linear speed is high, and the primary grinding rate is up to 1cm in thickness, so that the difficulty that the traditional grinding wheel can not be suitable for heavy load grinding of steel billets and steel material is better solved, and the need of increasing development of the steel industry is met.
Description
Technical field
The present invention relates to a kind of high speed resin heavy load grinding emery wheel and preparation method thereof.
Background technology
At present, steel enterprise steel blank regrinding operation is used is generally plain wheel, working strength of workers is big, the operating environment inclement condition influences workman's health of human body etc., emery wheel uniformity of hardness, physical dimension, low precision, be difficult to reach more than 80 meter per seconds, can not adapt to automation grinding and grinding at regular time and quantity, crushing often, complex procedures.Consume greatly, its quality can not satisfy high-end special steel enterprise demand far away, can not adapt to the grinding of steel billet such as steel industry, steel, and some improvement have also been done by domestic part producer, but DeGrain.
Summary of the invention
The present invention adopts a kind of high speed resin heavy load grinding emery wheel.The mechanization and the grinding efficiency problem of steel blank regrinding have been solved, grinding wheel grinding load is big, be convenient to realize mechanization and automation mechanized operation, thereby grinding efficiency improves greatly, per hour worn amount of metal can be up to 500～800Kg, grinding wheel adopts a kind of compound with high polymerization high-performance large-scale structural composite material modified resin bond and special-purpose high-end removing material, at the cold and hot molded curing reaction of specific process using, realize that high-strength polymer based anchoring agent two-phase strengthens the high speed resin heavy load grinding emery wheel of NEW TYPE OF COMPOSITE structure again.
Technical parameter or index: 1) use linear velocity 90-100m/s, 2) the static balance coefficient :≤0.32,3) pressure: 800-1000kgf, 4) axiality≤0.5mm, 5) uniformity of hardness :≤0.3h, (H is the phase difference, 6) grinding efficiency: 〉=1: 55.Under heavy load, the tension rupture strength is big, and grinding area requirement wide adaptability is under dry grinding or wet-milling condition, adapt to the grinding of various material, the grinding rate requires high, and linear velocity is fast, one time the grinding rate reaches 1cm thickness, and grinding steel billet cost can reduce greatly, is original 1/5th.It is compared with plain grinding, can improve to come into force rate 3-6 doubly; Because the raising of grinding speed, surface of the work formed bump height after the abrasive particle ploughing reduces, thereby the surface roughness of grinding is reduced; The life-span of emery wheel is improved about 1 times; Grinding force improves 50%, and the precision of processing is corresponding also to be improved.This project technology has the following advantages: the one, and under the situation of using conventional method and equipment, technology is simple, realizes easily producing in batches.The 2nd, the material comprehensive mechanical property is good, and its Tensile strength remains on the higher level; Adopt high-end abrasive material and engineering high-performance polymer structure simultaneously, percentage elongation remains on the higher level, improves tensile strength, the difficult point of percentage elongation reduction in the prior art though solved.The growing needs of China's steel and iron industry are satisfied in the modern production that adapts to China's steel and iron industry.
The technical problem to be solved in the present invention is, high speed resin heavy load grinding emery wheel is made up of marginal grinding area, core space, cast iron edge hole, the local steel loop of strengthening,
Have following characteristics:
A, employing grinding layer, core material, the different dual combination process design of institutional framework of hole core, be made in the high speed resin steel blank regrinding emery wheel that is different from the plain wheel structure, improve bond strength and use linear velocity to bring up to 90-100m/s, improve grinding ratio, grinding ratio 〉=1: 55.
B, the low-cost and high-performance polymer matrix composite is compound and forming processing technology has been strengthened hold and internal structure between abrasive material and the bond, the porosity is suitable, self-sharpening is good, the workpiece of not burning has improved an index such as uniformity of hardness of grinding tool inside simultaneously.
C, integrated application the complex technique of high strength and high-performance high-polymer resin structure, the inner different tissues structure of emery wheel.At the specific cold and hot molded curing reaction of process using large-tonnage shaping machine set, realize that high-strength polymer based anchoring agent two-phase strengthens advanced composite material (ACM) again.The one, under the situation of using conventional method and equipment, technology is simple, realizes easily producing in batches.The 2nd, the material comprehensive mechanical property is good, and its Tensile strength remains on the higher level; Adopt high-end abrasive material and engineering high-performance polymer structure simultaneously, the uniformity of intensity, hardness, hardness, linear velocity, grinding scope, grinding ratio are better than the existing market product significantly, percentage elongation remains on the higher level, be convenient to user's automation especially, though solved and improved tensile strength, the difficult point of grinding ratio percentage elongation reduction in the prior art.
One of technical scheme of the present invention, possesses superior tension rupture strength, prescription design of the special-purpose bond of the novel high-performance high polymer base phenol-formaldehyde resin modified emery wheel of high conjugation emery wheel and outer grinding layer, core material and hole core tripartite system difference in functionality structure division and preparation method thereof.
1, material selection:
(1) special-purpose bond main material---high polymer base phenol-formaldehyde resin modified preparation method:
The phenolic resins 90% that contains methenamine, novel phenolic resin 6%, polysulfone resin 4%,
The specification requirement of phenolic resins: free phenol content≤5%, methenamine content 7.5%-9% flows long 35-55mm, softening point: 100 ℃-108 ℃ of 100 ℃-105 ℃ summers in winter, 180# residue on sieve＜0.2%, water content≤2%.
Novel phenolic resin specification requirement: free phenol content≤3%, methenamine content 7.5%-9%, 100 ℃-108 ℃ of softening point 100 ℃-105 ℃ summers, density 1.65g/cm3,180# residue on sieve＜0.2%
Polysulfone resin specification requirement: slightly amber linear polymer.Relative density 1.24, water imbibition (24h) 0.22%, molding shrinkage 0.7%, 190 ℃ of melt temperatures, 150 ℃ of vitrification points, 174 ℃ of heat distortion temperatures (1.82MPa), hot strength 71.54MPa.Bending strength 105.8MPa, compressive strength 95.1MPa, stretch modulus 2.56Pa, notched Izod impact strength 6.9-7.8kJ/m2, specific insulation 10e15 Ω? cm.180# residue on sieve＜0.2%
With the respectively weighing in proportion of above-mentioned raw material, after putting bell batch mixer and evenly mixing 60min. and cross the 80# sieve, standby.High polymer base phenol-formaldehyde resin modified has increased substantially the durability and the intensity of bond, and Heat stability is good hear resistance height, and chemical stability is good, and product size is stable, and intensity improves 40～60%, and hear resistance improves 20%, and the anti-folding of tension improves more than 40%.
(2) removing material is selected for use and preliminary treatment:
The removing material selected for use of design need pass through preliminary treatment, the selecting for use and preprocess method of the heavy-load abraded steel billet wheel grinding of high speed resin material.Zirconia corundum abrasive (ZA) and alundum abrasive material composition grinding grain through putting in order, the alundum abrasive material is through special granulation technique with fine brown alumina grain, the cylinder grinding grain of making regulatory specifications passes through calcinations and sintering again, abrasive material after it is calcined is indeformable, the thermal expansion distortion is little, strengthened the bond strength of abrasive particle and bond, the bulky grain abrasive particle is adapted to the corase grind reconditioning of finished steel process more simultaneously, because the alundum abrasive material is to do a fine abrasive sintering by promise to form, form sharp one by one grinding sword during grinding, strengthened the grinding efficiency of grinding tool significantly, anti-burn ability with grinding tool, with high strength hold high polymer phenolic resin binder composite technology, establish for the realization of high speed heavy load grinding emery wheel technical indicator and to have stood the basis.
Raw material abrasive material, fiber, steel loop are all handled with coupling agent KH550, and it gives treatment process: principle is that a kind of reinforcing material is answered on film and high-grade abrasive material, fiber, the steel loop, with bond strength and the composite performance between enhancing and the bond equably.Respectively with the raw material abrasive material, the supporting material fiber, put in the adverse current batch mixer, start mixer, add the coupling agent KH550 of 1: 3 ratio and the mixed solution 75ml of industrial alcohol, behind the stirring 5min, take the dish out of the pot, put drying box with 120 ℃ of dry 1h after, handled material surface forms the multiple film of coupling agent KH550 and gets final product, and is standby.
2, prescription: the percentage by weight raw material that the preparation emery wheel uses has:
Table 2-1 limit bond material formula:
Table 2-2 core bond material formula:
Grinding wheel formula:
Table 2-3 limit material formula:
Table 2-4 core material formula:
1. material will be dried 90 ℃～110 ℃ of inorganic materials, 50 ℃～60 ℃ in organic material
2., fiber, abrasive material, steel loop are all used coupling agent treatment.
3, the special-purpose bond preparation method of high speed resin heavy load grinding emery wheel:
By table 2-1, table 2-2 prescription is preparation limit material bond and core material bond respectively, the bell batch mixer of device therefor: 150L,
Limit material bond preparation method: take by weighing raw material by prescription, limit material bond charging sequence is: phenol-formaldehyde resin modified, pyrite, SiC (400#), lime, butyral (Dai Sharan) is put bell batch mixer, starts mixer mixing 3-5min and adds zinc sulfate or zinc sulphide successively, and dibasic lead phosphite stirs 3-5m
Core material bond preparation method: take by weighing raw material by prescription, core material charging sequence is: phenol-formaldehyde resin modified, pyrite, SiC (400#), lime, butyral (Dai Sharan) is put bell batch mixer, start mixer mixing 3-5min, add dibasic lead phosphite and stir 3-5min, cross the 80# sieve, can be standby.
4, high speed resin heavy load grinding abrasive wheel forming preparation method for material:
By table 2-1, table 2-2 preparation limit material bond and core material bond, mixing equipment: two pots of adverse current batch mixers,
Limit material molding mass preparation method: charging sequence is:: take by weighing removing material by prescription, pour pot into, start mixer, add furfural+coal tar, dibutyl ester stirs 3-5min, pours into and cooks, start mixer, add bond, fiber (processing) stirs 3-5min and can change down the road molding procedure over to.
High speed resin heavy load grinding emery wheel its preparation method: with this basis bond and removing material (fused alumina zirconia, the alumina sintering corundum, the palm fibre corundum, black silicon carbide), inserts: troilite, ice crystal, calcium carbonate (lime), supporting material: mix the fine granularity abrasive material, fiber, steel loop (local repair) waits four part materials by force, by outer grinding layer, the proprietary formula that core material and hole core tripartite system design respectively feeds intake, the heavy-load abraded steel billet emery wheel of a kind of high strength efficient high-speed resin that the high strength dual phase reinforced composite preparation method who adopts complex technique and structure innovation to invent is prepared into.
Two of technical scheme of the present invention: the composite molding technique of the heavy-load abraded steel billet emery wheel of preparation high speed resin.
Adjust the tension rupture strength of emery wheel by the institutional framework that changes emery wheel, emery wheel is divided into three partial design, it is marginal grinding area, the core space that emery wheel and grinding machine or abrasive machine are fixing, with hole core three parts, it is that emery wheel is realized the zone that grinding function is realized that grinding area removing material and bond auxiliary material filler are formed, it is that emery wheel realizes being fixed to the zone on the lathe that core space is made up of different fine granularity removing material that is different from grinding area and bond auxiliary material filler, core requires than grinding area stronger tension rupture strength is arranged, higher conjugation is arranged, and the endoporus heart adopts cast iron heart to keep higher precision.
Different designs by grinding area core material realizes the designing requirement of emery wheel and superior cost performance.One-step forming at the beginning of 500 tons of shaping machine set are colded pressing, three kinds of structure one-shot formings of emery wheel base substrate, the high pressure low temperature thermosetting guarantees that emery wheel has higher tissue density and uniformity on 3000 tons of large-tonnage shaping machine set, thus the static and dynamic equilibrium coefficient of emery wheel by 0.63 of common heavy-load abraded steel billet emery wheel bring up to≤0.32.
Step of preparation process:
The technological process of high speed resin heavy load grinding emery wheel is referring to Fig. 1;
A, abrasive wheel forming:
Molding procedure is the process with powdery polymer phenol-formaldehyde resin modified abrasive tool moulding primary solidification, program and method according to this process stipulation, with the molding mass that mixes according to certain substance, with mold pressing typing pressurization, make the heavy-load abraded steel billet emery wheel of the high speed resin semi-finished product of all size, the quality of grinding tool blank should meet the regulation of grinding tool semi-finished product technical conditions.
This operation mainly adopts die pressing, and molding mass is evenly distributed in touching tool, the upper and lower surface uniform-compression, and it is even to reach the grinding tool green density, conforms to quality requirements.Use cold moudling on 500 tons of abrasive wheel forming press, by the moulding of following basic moulding substance, briquetting pressure: 17.5Mpa exerts pressure at twice, is the 1/4-1/3 of gross pressure for the first time, removes the grinding tool parallels then, exerts pressure by gross pressure, and keeps 1 minute.Deliver to hot-press solidifying on 3000 tons of emery wheel press together with a whole set of grinding tool by transfer system.Emery wheel semi-finished product base substrate is pressurize heating hot-press solidifying on 3000 tons of emery wheel press, exerts pressure at twice, finishes the primary solidification of grinding tool to the set point of temperature, 160 ± 5 ℃ of hot pressing temperature temperature, pressure 40～50Mpa, molding time 40 minutes.Mould unloading is put on the supporting plate, meet the molding mass technical conditions on inspection after, change next procedure over to.
| Trimmed size mm | Core molding mass (kg) | Limit molding mass (kg) | Remarks |
| 510×100×203 | 12.8 | 43.7 | ? |
| 610×75×203 | 12.4 | 48.1 | ? |
| 760×75×203 | 34.9 | 71.1 | ? |
B, consolidation and sclerosis
This technology is the final process of the consolidation and sclerosis of emery wheel blank, by the program and the method for this process stipulation, to emery wheel blank heat treated after the demoulding, making it to become has solid shape, and certain degree of hardness intensity and heat resistance are arranged, and conforms to quality requirements, change hardening process, firm time is about 30 hours.Solidification temperature: 120-183 ℃.Grinding tool finished product and this technology of semi-finished product.
Comprise:
The goods shove charge-→ sclerosis solidifies-→ come out of the stove-→ check-→ change next procedure over to
C, hardening curve,
The maximum temperature of sclerosis selects for use 183 ℃ of heating curves to select the 30h hardening curve for use, concrete curve:
(1) room temperature-→ 120 is ℃ 3 hours, (2) 120 ℃ of insulations 1 hour
(3) 120 ℃-→ 150 ℃ insulations (4) 150 ℃ of insulations in 3 hours 1 hour,
(5) 150 ℃-→ 183 ℃ 4 hours, (6) 183 ℃ the insulation 18 hours. the cooling. come out of the stove
D fine finishining and check
Emery wheel after sclerosis finished carries out a size and the row position tolerance that machining makes it to reach standard code, and the equipment of use comprises: metalworking lathe, plane of grinding wheel grinding machine, multi-functional emery wheel lathe etc.
Qualified goods also need be by the state-set standard inspection.
Below the present invention made further specify.
The present invention is with the special-purpose bond of high-performance modified high polymer base phenolic resins emery wheel, with removing material (fused alumina zirconia, the alumina sintering corundum, the palm fibre corundum, black silicon carbide), inserts: troilite, ice crystal, calcium carbonate (lime), supporting material: mix the fine granularity abrasive material, fiber, steel loop (local repair) waits four part materials by force, by outer grinding layer, the proprietary formula that core material and hole core tripartite system design respectively feeds intake, the heavy-load abraded steel billet emery wheel of a kind of high strength efficient high-speed resin that the high strength dual phase reinforced composite preparation method who adopts complex technique and structure innovation to invent is prepared into.
Integrated application of the present invention the complex technique of high strength and high-performance high-polymer resin structure, the inner different tissues structure of emery wheel.The cold and hot molded curing reaction of cold and hot molded curing reaction process using large-tonnage shaping machine set realizes that high-strength polymer based anchoring agent two-phase strengthens advanced composite material (ACM).Compound and the forming processing technology of low-cost and high-performance polymer matrix composite has been strengthened hold and the internal structure between abrasive material and the bond, and the porosity is suitable, self-sharpening is good, and the workpiece of not burning has improved an index such as uniformity of hardness of grinding tool inside.1) use linear velocity to bring up to 90-100m/s by 〉=60-80m/s, 2) static balance coefficient :≤0.63 bring up to≤0.32,3) pressure: 800-1000kgf, 4) axiality≤0.5mm, 5) uniformity of hardness: bring up to by≤1.2h ,≤0.3h, (H is the phase difference, 6) grinding efficiency: by grinding ratio 〉=1: 36 bring up to 〉=1: 55.Grinding efficiency is that the worn amount of metal per hour reaches 800～1000Kg, under heavy load, the tension rupture strength is big, and grinding area requirement wide adaptability is under dry grinding or wet-milling condition, adapt to the grinding of various material, the grinding rate requires high, and linear velocity is fast, and one time the grinding rate reaches 1cm thickness, grinding steel billet cost can reduce greatly, is original 1/5th.It is compared with plain grinding, can improve to come into force rate 3-6 doubly; Because the raising of grinding speed, surface of the work formed bump height after the abrasive particle ploughing reduces, thereby the surface roughness of grinding is reduced; The life-span of emery wheel is improved about 1 times;
This technology has the following advantages: the one, and under the situation of using conventional method and equipment, technology is simple, realizes easily producing in batches.The 2nd, the material comprehensive mechanical property is good, and its Tensile strength remains on the higher level; Adopt high-end abrasive material and engineering high-performance polymer structure simultaneously, the uniformity of intensity, hardness, hardness, linear velocity, grinding scope, grinding ratio are better than the existing market product significantly, percentage elongation remains on the higher level, be convenient to user's automation especially, though solved and improved tensile strength, the difficult point of grinding ratio percentage elongation reduction in the prior art.Utilize cold and hot molded curing reaction technology in the large-scale emery wheel manufacturing, the low-temperature setting technology is compared with traditional emery wheel manufacturing, and energy-saving and emission-reduction have reduced environmental pollution and exhaust gas discharging.
Description of drawings
Fig. 1 is the technological process of emery wheel; Fig. 2 is the vertical surface construction figure of emery wheel, among Fig. 2:
(1) marginal grinding area micro-structure diagram
(2) core space micro-structure diagram
(3) cast iron edge hole
(4) the local steel loop of strengthening
The specific embodiment:
Below in conjunction with description of drawings: the heavy-load abraded steel billet emery wheel of high speed resin is made up of outer grinding layer, core material and hole core tripartite system the complex technique and the structure innovation research and development of the special-purpose bond high-performance of high-performance modified high polymer base phenolic resins emery wheel abrasive material, inserts, wetting agent, reinforcing material.At first carry out high polymer base phenol-formaldehyde resin modified preparation and abrasive material preliminary treatment 1 select materials (raw and auxiliary material technical conditions)
1, raw material: fused alumina zirconia, alumina sintering corundum, brown corundum are by country and the fixed excessively technical conditions of industry standard.
2, each explains modified resin more than the component.
3, dibutylester, DBP: commercial grade, chemical name: dibutyl phthalate (DBP) outward appearance: transparent oily liquid, color and luster (APHA)≤60, acidity (in phthalic acid) %≤0.030, ester content % 〉=99.0 heating loss (125 ℃ 3 hours) %≤0.7 flash-point (opening agar diffusion method) ℃ 〉=160 proportion D
30 MD0.044-0.048.
4, furfural: commercial grade, molecular formula C5H4O2.Claim 2 furan carboxyaldehyde again.Colourless liquid has and the similar smell of benzaldehyde.Fusing point-38.7 ℃, 161.7 ℃ of boiling points, relative density 1.1594 (20/4 ℃).
5, pyrite dust: commercial grade, ferrous disulfide: FeS2, ((more than the Fe 〉=50%min), the order number is at 350 orders, proportion 4.9-5.2 for the iron-holder of S 〉=47%min) for sulfur content
Fiber: adopt glass fibre.The use length of glass fibre is generally 0.5～10mm.
6, butyral (Dai Sharan) resin, commercial grade, type: thermoplastic resin, density 1.07g/cm3, molecular weight is from 30-45k refractive index 1.488 (20 ℃).Water absorption rate is not more than 4%.Softening temperature 60-65 ℃.Vitrification point 66-84 degree.
7, dibasic lead phosphite: commercial grade, [molecular formula] 2PbOPbHPO
31/2H
2The O[molecular weight] 742.66, be white or little bloom end, lead content (in PbO) 89.5-91.5%, phosphorous acid (H
3PO
3) 9.0-12.0%, heating loss≤0.60, residue on sieve (75 μ m)≤0.80%
The heavy-load abraded steel billet emery wheel preparation of high speed resin
1) mixed ingredients technology
Respectively according to Recipe will give abrasive material after the processing, bond, bond, wetting agent, filler in accordance with regulations quantity and program by mechanical agitation, be stained with uniformly and be coated in the qualified molding mass that makes it to become qualified processability on the abrasive material with good processability.Be ground to moulding mixture and the heart molding mass is formed by skin, prepare bond, molding mass batch mixing respectively by prescription.
2) moulding process
According to grinding tool blank specification shape, correctly select and assemble mould for use.
In order to make in-mold molding material two sides pressurized make base substrate even tissue up and down, when moulding, all use the parallels moulding.
Weighing and feeding intake: in the mould that assembles, cast iron hole heart is put into the position, aperture, grinding part molding mass and the hole core molding mass gradation that weighs up dropped in the mould, adopt diverse ways that it is evenly distributed.
3) hardening process (curing process):
(1) selecting for use of hardening furnace selects for use suitable hardening equipment to select electrical heating type hot air circulation hardening furnace for use according to the specification quantity of grinding tool blank and the purpose of sclerosis.
(2) check whether the hot blast system of hardening furnace equipment normal, thermometric instrument indicate whether with stove in coincide, whether the temperature difference meets the requirements in the stove.
(3) audit program intelligent regulator, hardening curve imported instrument after, whether furnace temperature can detect its temperature measurement accuracy, antijamming capability and sensitivity by predefined heating curve follow procedure A.T.C.Reliability.
(4) select suitable sclerosis backing plate and cover plate for use.
(5) shove charge sclerosis
4) fine-processing technique:
Technical process comprises: the emery wheel blank-→ aperture processing-→ plane processing-→ cylindrical processing.
5) inspection process
The inspection process process: outward appearance-→ revolving strength-→ the thickness form and position tolerance-→ aperture, hardness
Revolving strength check: should on φ 1800mm intelligence rotation test machine, carry out, the revolving strength check is divided into destructive testing and safety testing, destructive testing is to indicate to use the linear velocity twice, safety testing is to indicate to use 1.5 times of linear velocities, keeping must the time, destructive testing is by technological procedure sampling observation, safety testing one hundred percent inspection.
Claims (1)
1. high speed resin heavy load grinding emery wheel and preparation method thereof is made up of marginal grinding area, core space, cast iron edge hole, the local steel loop of strengthening, and it is characterized in that this emery wheel processing method is:
(1) by outer grinding layer, core material and hole core tripartite system difference design specialized prescription, percentage or percent by volume raw material that preparation preparation emery wheel uses have:
A, high-performance modified high polymer base phenolic resins percentage by weight raw material has: contain the phenolic resins 90% of methenamine, novel phenolic resin: 6%, polysulfone resin 4%;
B, marginal material formula:
C, the core material formula:
D, the inner edge of emery wheel hole is a cast iron materials, will handle surface galling at its cylindrical, with the bond strength of reinforcement and core material.
(2) step of preparation process:
A, mixed ingredients: prepare bond respectively by above-mentioned formula table and strengthen phenolic resins with modification, take by weighing the above-mentioned modification for preparing and strengthen phenolic resins and prepare limit material bond and core material bond respectively by above-mentioned formula table, prepare bond after, can carry out the preparation of abrasive wheel forming material.
B, moulding: on 500 tons of abrasive wheel forming press, use cold moudling, place and install emery wheel foundry goods edge hole behind the mould, by following basic moulding substance respectively weighing drop into core material and molding mass successively, take out the barrier film between coring portion material and the molding mass, exert pressure at twice, briquetting pressure: 17.5Mpa is the 1/4-1/3 of gross pressure for the first time, removes the grinding tool parallels then, exert pressure by gross pressure, and kept 1 minute.Deliver to hot-press solidifying on 3000 tons of emery wheel press together with a whole set of grinding tool by transfer system, pressure 40～50Mpa exerts pressure at twice, finishes the primary solidification of grinding tool to the set point of temperature, 160 ± 5 ℃ of hot pressing temperature temperature, molding time 40 minutes.Next procedure is changeed in the demoulding.
The moulding substance:
C, consolidation and sclerosis: to emery wheel blank heat treated after the demoulding, making it to become has solid shape, and certain degree of hardness intensity and heat resistance are arranged, and conforms to quality requirements, and the maximum temperature of sclerosis selects for use 183 ℃ of heating curves to adopt 30 hours 120-183 ℃ of hardening curves:
(1) room temperature-→ 120 is ℃ 3 hours, (2) 120 ℃ of insulations 1 hour
(3) 120 ℃-→ 150 ℃ insulations (4) 150 ℃ of insulations in 3 hours 1 hour,
(5) 150 ℃-→ 183 ℃ 4 hours, (6) 183 ℃ the insulation 18 hours. the cooling. come out of the stove
D after sclerosis is finished, also need carry out size and the tolerance of machining to reach regulation, and standard inspection is in accordance with regulations made.
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Application publication date: 20110824 |