CN1060928A

CN1060928A - A kind of manufacture method of used in high-speed motor brush

Info

Publication number: CN1060928A
Application number: CN 90102963
Authority: CN
Inventors: 钱玉章; 顾庙昌; 季慧琴; 刘新华; 孙美玉
Original assignee: ELECTRIC CARBON FACTORY HAIMEN COUNTY
Current assignee: ELECTRIC CARBON FACTORY HAIMEN COUNTY
Priority date: 1990-10-22
Filing date: 1990-10-22
Publication date: 1992-05-06
Anticipated expiration: 2005-10-22
Also published as: CN1029715C

Abstract

The present invention relates to a kind of manufacture method of used in high-speed motor brush, brush is by the special fine graphite powders of spraying carbon black, coal tar, stage material powder, living pitch coke powder, suffering medium pitch 1134 resins, industrial alcohol, form by proportioning, by prolongation roasting time in roasting technique with in impregnation technology, with the maceration extract and the Delanium impregnation process of the 1134 resins preparation of 80% industrial alcohol dilution 20%, make brush have high abrasion, voltage drop is little, spark is little premium properties.

Description

A kind of manufacture method of used in high-speed motor brush

The present invention relates to a kind of manufacture method of used in high-speed motor brush.Brush for electromachine is widely used in the high speed commutator machine.

The D374L brush of domestic production at present expects that by one stage of D308 powder, semi-reinforcing carbon black, suffering medium pitch, lead hydroxide, phosphoric acid forms.Through heat mix, roll sheet, cooling, roasting, broken green compact and the bituminizing that sieves, is pressed into geometry put into cellar for storing things roasting more again, after Overheating Treatment, form the carbon goods, again it is carried out 2500 ℃ heat treatment, form Delanium after the graphitization, make maceration extract with aluminium hydroxide and phosphorylated ligand again and carry out making with machining after the impregnation process.This brush has directly influenced the performance and the useful life of brush because the limitation of prescription and roasting, impregnation technology.When being used for high-speed electric expreess locomotive, the stable use after 300 hours, it is big to produce spark, and motor heats up high, so that motor can't normally move.The material prescription of D374L brush sees Table 1, one stage roasting temperature rise timetable and sees Table 2, and green compact temperature rise timetable sees Table 3.

Table 1:D374L brush material prescription

Sequence number	Title material	Processing compound (kilogram)	Remarks
				1	The D308-stage is expected powder	480
2	Semi-reinforcing carbon black	200
				3	The suffering medium pitch	320
4	Aluminium hydroxide	115
				5	Phosphoric acid	60

Table 2: stage material roasting temperature rise timetable

Temperature	Temperature rise speed	Time (hour)
			Room temperature-500 ℃	Freely rise	4
500～550℃	25 ℃/4 hours	8
			550℃	Keep	24
550～850℃	15 ℃/4 hours	80
			850～1150	60 ℃/4 hours	20
1150℃	Keep	48

Table 3: green compact roasting temperature rise timetable

Temperature ℃	Order of classes or grades at school	Temperature ℃	Order of classes or grades at school	Temperature ℃	Order of classes or grades at school	Temperature ℃	Order of classes or grades at school
								Room temperature-400	1	660	9	740	17	900	25
500	2	670	10	750	18	950	26
								530	3	680	11	760	19	1000	27
560	4	690	12	770	20	1050	28
								590	5	700	13	780	21	1100	29
610	6	710	14	790	22	1200	30
								630	7	720	15	800	23	Insulation	31－36
650	8	730	16	850	24

Annotate: per tour amounted to 288 hours in inferior 8 hours

The manufacture method that the purpose of this invention is to provide a kind of used in high-speed motor brush by changing prescription, roasting and impregnation technology, makes brush have that voltage drop is little, spark is little, the good property of high abrasion, and the useful life that can improve motor.

Technical characterictic of the present invention is: a kind of prescription of used in high-speed motor brush is made up of the raw material in the table 4: (with 1000 kilograms of proportionings)

Table 4: used in high-speed motor brush prescription

Sequence number	Title material	Processing compound (kilogram)	Remarks
				1	The spraying carbon black	45	A-17-stage material powder
2	Special fine graphite powders	5
			3	Coal tar	50
4	The A-17-stage is expected powder	500				Two-stage material powder
			5	Give birth to the pitch coke powder	250
6	The suffering medium pitch	250
			7	1134 resins	20		Maceration extract
	Industrial alcohol	80				Maceration extract

Owing in the preparation of stage material powder, add the special fine graphite powders of certain proportioning, can improve the lubrification of brush, improve resistance to wear.

In roasting technique, bakes to burn the article time lengthening to 304 hour, after baking time lengthening to 480 hour.Because change stage material powder roasting temperature rise technology through test of many times, green compact roasting temperature rise technology prolongs temperature retention time, sees table 5, table 6 for details.Can prevent effectively that brush from ftractureing after roasting.In impregnation technology, the industrial alcohol of employing 80% and 20% 1134 resins dilute, and when put into the dipping cellar for storing things through the brush blank after the electrification after, pressurize in the lump in the 1134 resin suction dipping of dilution is stored and carry out impregnation process.Because the material mixture ratio in the above-mentioned prescription, roasting and impregnation technology are improved, and make its resistivity reach 23-40 ohm millimeter ²/ rice is reduced to 1.5～2.5V to the touch voltage of brush, and coefficient of friction is not more than 0.25,50 hour attrition value and is not more than 0.1 millimeter, and nominal current density is 10 amperes/centimetre ², allowing peripheral speed 80 meter per seconds, spark is not more than 1 1/2 grades.

Advantage of the present invention is: owing to put into lubrification and the resistance to wear that the special fine graphite powders of certain proportioning has improved brush in raw material; Owing in first and second roasting technique, change the temperature control time, solved the defective of cracking in the former brush manufacturing effectively; Owing in impregnation technology, adopt industrial alcohol to dilute the maceration extract good penetrability of preparing behind 1134 resins, through with brush green compact impregnating by pressure after, mechanical strength and raising useful life that can strengthen brush.Examine through 700 hours continuous life tests of row in the lump with the present invention motor brush of making (A-17) and the C-1 brush that Japan makes through No.20 Inst., Ministry of Machine-Building and Electronics Industry, conclusion is: " aspects such as spark, useful life can reach the advanced level of Japanese C-1 brush, maintain the leading position at home ".Therefore the alternative imported product of A-17 brush of the present invention's manufacturing has highly application value.Its main performance index comparison of test results sees Table 7.

Embodiments of the invention: the manufacture method that exemplifies the A-17 brush.Its formula for raw stock is seen the table 4 in the technical characterictic, presses the proportion ingredient of 1000 kilograms of unit product net weight.At first will spray carbon black, special fine graphite powders, coal tar adds the two slurry mixing machines of 500 liters in proper order by the ascending principle of proportion, heat mixed, and when mixed the adding binding agent.Behind the temperature and time that reaches routine, the powered-down discharging.Have plasticity, be easy to die mould by the mixed material powder that makes, improve the compaction rate of material powder.Pour the material powder into flaking machine and roll into the thick tablet of 5mm earlier, reroll into the thick tablet of 2mm.Reach the air that expels in the material powder by rolling sheet, make tablet closely knit, improve suppression performance, reduce the required unit pressure of compacting.Tablet after rolling is placed on natural cooling or forced ventilation cooling in the case, with cooled tablet send into universal mill routinely milling process oarse-grained tablet is ground the granularity of process stipulation.Material powder after grinding is put into hanger supported shaking screen, sieve, remove bulky grain and exogenous impurity in the material powder.300 tons hydraulic presses are good by proportion, the pressure debugging of the green compact of process stipulation, the material powder with mark of conformity is put into hydraulic press, by compacting binder is pressed under certain pressure is suppressed have certain geometrical shape, the green compact of certain weight proportion.Green compact are packed into carry out the phase I roasting in the cellar for storing things, the temperature and time of one stage material roasting is seen the table 5 in the technical characterictic.Put into broken again impurity and the bulky grain removed of disintegrating machine after the cooling, become stage material powder, give birth to asphalt powder with 50% stage material powder, 25% again, 25% medium pitch is broken again, pressed compact after mixed, the hot rolling sheet of heat, the cooling again, carry out the roasting second time, the temperature and time of its roasting is seen the table 6 in the technical characterictic.Prolong the temperature retention time of temperature by after baking, solved former manufacturing center brush problem easy to crack after roasting.By after baking, improved the mechanical strength of goods; Reduce resistance, strengthen anti-wear performance.Handle the back through roasting heat and form the carbon goods, again the carbon goods are placed in the graphitizing furnace energising and by the high-temperature process more than 2500 ℃, pass through graphitization, improve the conductivity of heat and electricity, improve chemical stability, despumation improves purity, improves abrasion resistance, reduce hardness, improve machining property.The Delanium that forms after graphitization carries out impregnation technology again, and 1134 resins of the industrial alcohol dilution 20% with 80% are mixed with maceration extract, and the Delanium after graphitization is put into the dipping cellar for storing things, vacuumizes earlier, then with in the maceration extract suction cellar for storing things.Closed shutter pressurizes 8 kilograms, and pressurize was opened dipping Jiao Gai and taken out goods greater than 5 hours, put into baking oven, low temperature drying.Require to be machined into the brush of various how much shapes again according to product design document.

Table 5: one-phase material roasting temperature rise timetable

Temperature	Temperature rise rate	Time (hour)
			Room temperature-500 ℃	Freely rise	8
500℃～550℃	25 ℃/8 hours	16
			550℃	Keep	48
550℃～850℃	15 ℃/8 hours	120
			850～1150℃	60 ℃/8 hours	40
1150℃	Keep	72

Table 6: green compact roasting temperature rise timetable

Temperature ℃	Order of classes or grades at school	Temperature ℃	Order of classes or grades at school	Temperature ℃	Order of classes or grades at school	Temperature ℃	Order of classes or grades at school
								Room temperature-400	1	660	9	740	17	900	25
500	2	670	10	750	18	950	26
								530	3	680	11	760	19	1000	27
560	4	690	12	770	20	1050	28
								590	5	700	13	780	21	1100	29
610	6	710	14	790	22	1200	30
								630	7	720	15	800	23	Insulation	31～50
650	8	730	16	850	24

Annotate: per tour 8 hours, public meter 400 hours

Claims

1, a kind of manufacture method of used in high-speed motor brush is characterized in that brush is made up of spraying 45 kilograms of carbon blacks, 5 kilograms of special fine graphite powders, 50 kilograms in coal tar, a stage 500 kilograms in powder of material, the proportioning of giving birth to 250 kilograms of pitch coke powders, 250 kilograms of suffering medium pitch, 20 kilograms of 1134 resins, 80 kilograms of industrial alcohol.

2, a kind of manufacture method of used in high-speed motor brush is characterized in that the bakes to burn the article time is 304 hours in roasting technique, and temperature rise is from 500 ℃～1150 ℃, and the after baking time is 480 hours, and temperature rise is from 400 ℃～1200 ℃; In impregnation technology, the maceration extract and the Delanium of the 1134 resins preparation of the industrial alcohol dilution 20% with 80% are put into the dipping cellar for storing things, and vacuum pressed, pressurize are handled.