CN101368594B - Miniature linear bearing and manufacturing method thereof - Google Patents
Miniature linear bearing and manufacturing method thereof Download PDFInfo
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- CN101368594B CN101368594B CN2008101210800A CN200810121080A CN101368594B CN 101368594 B CN101368594 B CN 101368594B CN 2008101210800 A CN2008101210800 A CN 2008101210800A CN 200810121080 A CN200810121080 A CN 200810121080A CN 101368594 B CN101368594 B CN 101368594B
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Abstract
Disclosed is a mini size linear bearing which comprises a cylinder ring, a plastic maintaining frame and a steel ball; the cylinder ring is formed through the punching and drawing of a metal plate; 4-8 parallel steel ball rolling grooves with equal intervals are arranged on the cylinder ring along the axial direction; the cavity wall of the plastic maintaining frame is provided with ellipse raceways corresponding to the axial rolling grooves on the cylinder ring; annular surfaces with central openings bent inwards are arranged on both ends of the cylinder sleeve. The manufacturing method includes that the cylinder ring adopts a rolled low carbon steel sheet which is punched by a punching mould on a punching machine tool and is drawn by a precious drawing mould on a hydraulic machine tool for three times until the steel sheet is thin, so as to obtain the cylinder ring green body; a hole is punched on the bottom; the gap and the upper end are flatted; then a plurality of axial rolling grooves are punched on the cylinder ring in the axial direction; then the cylinder ring is polished to eliminate the burrs by a polisher; the carbon-nitrogen co-cementation treatment is processed on the cylinder ring; the backfire softening treatment is processed on the upper end of the cylinder ring; then the cylinder ring is processed with shaping and cleaning to finish the machining of the cylinder ring. Compared with the linear bearing, the volume of each set with the same specification is reduced by 30%; the weight is reduced by 50% and the cost of each set is saved by 40%.
Description
Technical field
The present invention relates to a kind of linear bearing, particularly become the miniature linear bearing and the manufacture method thereof of cylinder lasso by sheet metal stretch.
Background technique
The cylinder lasso of linear bearing adopts Gr15 bearing steel pipe precision rolling to become the circular arc type steel tubing in different shapes, cut off through blanking, again by the internal external diameter of lathe, raceway step and the processing of inside and outside groove cutting, heat-treat to reach regulation hardness and mechanical strength, by grinding machine external diameter in it is carried out thick fine ginding then, grinding reaches the tolerance grade requirement to internal diameter by lapping machine again, and both ends of the surface are carried out plain grinding, and the processing of cylinder lasso is just finished like this.Because the cylinder lasso of linear bearing adopts the bearing steel pipe, many with material, the manufacturing procedure complexity, difficulty is big, the difficult control of tolerance grade, quality be cannot say for sure to demonstrate,prove, cause the product process-cycle long, the cost of production height, and cylinder lasso internal diameter steel ball rolling channel contacts with steel ball and is the some contact, surface of contact is little, during as heavy load cut is appearred in axle easily; Also fragile linear bearing when working time is long, thereby reduction of service life.
Summary of the invention
The present invention be directed to present generic linear bearing cylinder lasso and adopt the processing of Bearing Steel steel tubing in different shapes, the consumption of every cover metallic material is big, manufacturing procedure is many, difficulty is big, and the manufacture cycle is long, the difficult control of quality, to design a kind of processing simple for this reason, with short production cycle, manufacture method and the individual configurations that can enhance productivity and reduce manufacture cost are small and exquisite, lightweight miniature linear bearing.
The present invention realizes above-mentioned target by the following technical solutions.
The cylindrical sleeve circle manufacturing method of miniature linear bearing, miniature linear bearing comprises cylinder lasso, plastic cage and steel ball, the cylinder lasso is by the die-cut drawing and forming of sheet metal, axially establish 4～8 equidistant steel ball slot rollings that are parallel to each other in cylinder lasso upper edge, the chamber wall of plastic cage be provided with the cylinder lasso on the axial corresponding oval raceway of slot rolling, the two ends of cylinder lasso are for inwardly curving the toroidal surface of middle opening.
1, the manufacture method of cylinder lasso may further comprise the steps:
1), the low carbon steel cold rolled sheet is die-cut into circular base substrate;
2), circular base substrate is carried out on the press machine of drawing die stretching the first time being equipped with, tensile elongation is 25～35% of a cylinder lasso total length;
3), will carry out stretching second time on the hydraulic machine of drawing die being equipped with through the base substrate that stretches for the first time, tensile elongation is a cylinder lasso total length 80～90%;
4), will carry out the destressing soft temper through the cylinder lasso base substrate that stretches for the second time, tempering furnace is the sealing pit-type furnace, 500～600 ℃ of tempering temperatures, arrive temperature after insulation came out of the stove in 1 hour, in air, cool off, and with cleaning solution clean surface impurity;
5), the cylinder lasso base substrate of crossing through temper stretches for the third time, with stretching and the attenuation mould is stretched to 105～110% of total length on hydraulic machine, and the two ends of cylinder lasso are respectively accounted for length 15～20% positions stretch progressively that attenuation becomes the inclined-plane;
6), smooth to carry out end face through the cylinder lasso opening end after three stretchings;
7), opening end being passed through smooth cylinder lasso is being equipped with on the press machine of blanking die the locating notch on its bottom centre punched openings toroidal surface and the toroidal surface;
8), the cylinder lasso that will stamp out toroidal surface is placed on and carries out die-cut slot rolling on the punch press that many side blows groove cylinder mould is housed;
9), the cylinder lasso that carries out die-cut raceway groove is carried out surface finish, flash removed and treating selvedge with buffing machine, surface roughness reaches 0.8 μ m;
10), the cylinder lasso that carries out surface finish, flash removed and treating selvedge is carried out carbonitriding heat treatment and vacuum heat treatment, surface hardness reaches HV660～790, carburized layer thickness 0.2mm～0.3mm.
2, plastic cage adopts engineering plastics with supporting injection machine and each specification mold injection molding;
3, the steel ball rank is 10 grades, and the rule value is between ± 10;
4, above-mentioned cylinder lasso, plastic cage, steel ball through being up to the standards carried out combine and assemble after, the toroidal surface of punching press middle opening at one end, adopt accurate plug skewer flexibly at last again in the aperture, and on the air pressure clamp device, internal diameter ball group is adjusted to smooth and easy flexible with air pressure.
The cylinder lasso of miniature linear bearing is a critical component of the present invention, select the high-quality cold rolled sheet for use, by die cutting die and accurate drawing die on press machine and hydraulic machine through one-step punching, three drawing and formings, the toroidal surface of punching press middle opening on the cylindrical sleeve circle body of bottom sealing, axially adopt the accurate punching mould to cut equally spaced parallel slot rolling, deburring again to cylinder lasso base substrate again in precision stamping lathe upper punch.Then through carbonitriding heat treatment and cleaning, carry out whole shaping on the press machine of accurate plug being equipped with.
The present invention adopts no cutting technology, and the material-saving saving of labor shortens the manufacture cycle, enhances productivity.On saving cost of production basis, compare with the generic linear bearing, the same every cover volume of specification dwindles 30%, weight reduces 50%, it is typical microminiature series linear bearing, also save cylinder lasso high-quality steel 60% simultaneously, every cover is saved cost 40%, and can be widely used in small-sized machinery and instrument, in use can keep the performance and the function of generic linear bearing, on indexs such as cost performance, be better than the generic linear bearing greatly.
Description of drawings
Fig. 1 is the miniature linear bearing structural drawing, and wherein A is axial half-sectional view, and B is half-sectional view radially.
Fig. 2 is cylindrical sleeve coil structures figure, and A is axial sectional view, and B is a radial cross-section.
Fig. 3 is the plastic cage structural drawing, and A is axial half sectional view, and B is half sectional view radially.
Fig. 4 is a cylinder lasso manufacturing process schematic representation, and A is that blanking is die-cut, and B stretches for the first time, and C stretches for the second time, and D is for stretching for the third time, and two ends skew face, and E is the axial section of D, and F presses off a mouthful toroidal surface for curved, and G is die-cut slot rolling.
Embodiment
The miniature linear bearing structure as shown in Figure 1, comprise cylinder lasso 1, plastic cage 2 and steel ball 3, by the die-cut cylinder lasso that is drawn into of sheet metal, axially establish 4～8 equidistant parallel steel ball slot rollings 5 in cylinder lasso upper edge, the chamber wall that is enclosed within the plastic cage 2 in the cylinder lasso 1 be provided with cylinder lasso 1 on the axial relative oval raceway 4 of slot rolling.
The raw material of plastic cage are engineering plastics, select the high-quality acetal resin for use, because hardness and other plastics height of strength ratio of polyoxymethylene, and it is moderate, contraction deformation is little in molding and forming, and injection moulding rate height is the desirable feedstock of more suitable manufacturing plastic cage.
Die cavity core material in the mould of making plastic cage, select for use intensity big, the surface abrasion resistance heat resisting corrosion-proof is good, the alloyed steel trade mark that heat treatment deformation is little is made the die cavity core for 3Gr2W8V die steel, after high-temperature heat treatment adds medium-temperature tempering and handles, make it reach good heat resistance, shock-resistant, wear resistance is strong, long service life.
It is 60KN-100KN that plastic molding press can be selected pin mould power for use, and model is the accurate plastic molding press of YJ80/60.Injection moulding process is conventional injection technique, earlier qualified raw material at the baking oven drying, and the product mold upper and lower mould is respectively installed on the work block of regulation plastic molding press.Mould carries out preheating earlier, just can carry out injection work after reaching set point of temperature, and temperature-time is all by the automatic control operation of automatic controlling instrument, and the plastic cage of molding and forming is carried out the unhairing deburring after cooling.In order to improve finished product accuracy, strengthen heat resistance and impact resistance, prevent the manufactured good craze and transfiguration, the assurance tolerance grade is stable, and the plastic cage of making type is carried out Low Temperature Heat Treatment, is heated to 80 ℃～100 ℃ at baking oven, time is about 1 hour, and is stable to guarantee the plastic cage end product quality.
The structure of cylinder lasso as shown in Figure 2,4～8 equidistant parallel steel ball slot rollings 5 axially are set on cylinder lasso 1 outer peripheral surface, be the inner arc surface 6 of projection a little between the steel ball slot rolling 5 of cylinder lasso 1 inwall, its two ends be to cylinder lasso opening end inclination inclined- plane 7,7 '.Cylinder lasso 1 two ends are the open circles anchor ring 10,11 that inwardly curves, and one of them toroidal surface 10 is provided with the breach 8 with projection 9 tablings of plastic cage end face.
Cylinder lasso working process is shown in A～G of Fig. 4, for making cylindrical sleeve loop-shaped structure reach the tolerance grade of designing requirement, on press machine and hydraulic machine, carry out the streamlined operation by die cutting die and accurate drawing die, to increase work efficiency, adopt no cutting manufacturing, may further comprise the steps:
1), adopt high-quality low carbon steel cold rolled sheet, the trade mark is DC04 or DC05, it is two kinds of 1.2mm and 1.8mm that specification is divided into thickness according to the product size, with die cutting die at pressure is to be punched to the circular base substrate that leaves certain surplus, Fig. 4 A on the press machine of 10 tonnages;
2), circular base substrate that upper track is fallen is put on the 35 tonnage press machines that drawing die is housed and stretches for the first time, tensile elongation is 25～35% of a cylinder lasso total length, Fig. 4 B;
3), will put on the hydraulic machine of 60 tonnages that drawing die is housed through the back base substrate that stretches for the first time and carry out stretching second time, tensile elongation is a cylinder lasso total length 80～90%, Fig. 4 C;
4), can produce the internal stress of sclerosis, fragility through succeeding stretch cylinder lasso base substrate, for eliminating the internal stress defective, must carry out the destressing soft temper one time, tempering furnace is the sealing pit-type furnace, 500～600 ℃ of tempering temperatures, insulation was come out of the stove in 1 hour after temperature reaches, and cooled off in air, and, make its any surface finish free from admixture to cylinder lasso base substrate cleaning solution clean surface;
5), the cylinder lasso base substrate with tempered processing stretches for the third time, the precision die that stretches with the attenuation one is installed on 60 tonnage hydraulic machines, tensile elongation is 105～110% of a cylinder lasso total length, 15～20% extension position at the two ends of cylinder lasso are carried out progressively attenuation become the inclined-plane, middle 60～70% projectioies, the bevel altitude difference is 0.05～0.1mm, the arc surface 6 of intermediate projections is a steel ball motion raceway, inclined-plane, two ends 7 and 7 ' move Fig. 4 D and E for steel ball reaches smooth transition at bend;
6), to cylinder lasso after stretching for three times, it is smooth that open end carries out end face, reaches the specific length of product specification;
7), will be through the smooth back of tack cylinder lasso locating notch 8 on punched openings toroidal surface 10 and the toroidal surface in the middle of being equipped with on the 10 tonnage punch presses of blanking die to its bottom, punching hole diameter is than the big 0.1mm～0.2mm of steel ball size specification, Fig. 4 F;
8), the cylinder lasso that will stamp out toroidal surface carries out die-cut slot rolling on the 15 tonnage accurate punching machines that accurate dark many side blows of tube groove mould is housed, according to each cylinder lasso of deisgn product size 4～8 equidistant parallel slot rollings 5, Fig. 4 G arranged axially;
9), the cylinder lasso that carries out die-cut slot rolling is carried out surface finish, deburring and treating selvedge, on the GST vibratory finishing machine, adopt small abrasive grains of 3～5mm and lapping liquid to carry out deburring unhairing cleaning, every case is adorned 30～50KG, polishing time is 30～40 minutes, reach bright and clean no burr, surface roughness reaches 0.8 μ m;
10), carry out carbonitriding heat treatment to handle back cylinder lasso through surface finish, the cylinder lasso is put into the carbonitriding stove, temperature is 820～870 ℃, holding time is 1～1.5 hour, under equality of temperature, carry out vacuum heat treatment then again, 160 ℃～180 ℃ low-temperature temperings, reach surface hardness HV660～790 again, carburized layer thickness is 0.2mm～0.3mm;
11), for preventing that the cylinder lasso is behind the assembling finished product, crackle or rough surface injustice appear in really up to the mark the sealing in upper-end surface, influence the quality of outward appearance, therefore be 5mm～8mm to sealing upper-end surface length, adopt small-sized high frequency induction heater that it is carried out the softening processing of prompt tempering, make hardness be reduced to HB150～200N/mm2;
12), abovely on 15 tonnage punch presses, adopt extraordinary core rod to carry out whole shaping to the cylinder lasso for preventing the distortion, overproof after heat treatment and the tempering, reach tolerance;
13), above cylinder lasso carried out surface roughness once more handle, specifically by the GST vibratory finishing machine, adopt φ 3～φ 5 abrasive materials with lapping liquid and brightening agent, every case dress weight 40～50KG, polishing milling time 30～40 minutes makes the surface-brightening free from admixture, and roughness reaches 0.4 μ m;
For making the cylinder lasso reach the machining accuracy grade, requirements such as figure tolerance and inner and outer surface roughness to the choices of raw materials outbalance, are adopted the cold rolled sheet of homemade high-quality Baosteel product, and the trade mark is DC04 and DC05; External as Japanese ST14 or the ST15 high-quality cold rolled sheet that produces is all available, this strength of materials is little, and plasticity and toughness are very high, good punching press extension property is arranged, be suitably ultra-deep stretching, under the less condition of drawing coefficient, do not ftracture after the stretching, and price is moderate, is the good material of doing the cylinder lasso.
In addition because cylinder lasso id tolerance≤0.02mm, wall thickness difference≤0.02mm, roughness is 0.4 μ m, required precision belongs to the bigger product of difficulty in no cutting like this, therefore each mould process is improved, particularly various drawing dies, select for use wear resistance good, impact resistance is strong, and the Hardmetal materials that hardness is high, the trade mark are Gr20 material mould, because of this material hardness 〉=HRC80, and common cold-working die material chromium alloyed steel, the trade mark is Gr12, after heat treatment hardness is HRC60～62.So alloy on the make acquires a certain degree of difficulty, the conventional mould process of making of change adopts retrofit, reach to meet each working procedure processing requirement, and steady following some the critical process point of work in-process:
One of critical process: add in the attenuation processing technology in stretching for the third time, this mould outside above mould processing technology, is also increased fine-processing techniques such as lappingout finishing polish, make the last accuracy tolerance≤0.05mm of mould, mold work surface roughness≤0.2 μ m.The assurance of mould and die accuracy has been arranged, the processed product quality is guaranteed.Also can prolong die life simultaneously.Be equipped with the working machine tool that is complementary with mould in addition, stretched and attenuation processing by the high YF-60 type four-column hydraulic press bed of precision, to make the inclined-plane, two ends be steel ball can smooth transition at bend, makes cylinder lasso global tolerance and wall thickness difference reach designing requirement simultaneously.
Two of critical process: to the Punching Technology of the axial slot rolling of cylinder lasso, the overproof or overproof displacement of location gap as die-cut groove, when not meeting tolerance, steel ball on slot rolling during linear movement operation dumb or produce the retardance phenomenon, can not carry out proper functioning.Same axial slot rolling width tolerance≤0.05mm, each raceway pitch of grooves tolerance≤0.10mm, therefore adopt many Side Cuttings of the dark tubular of the axial precision mould on the cylinder lasso, on 15 tonnage accurate punching machines, carry out die-cut raceway groove, crucial knife edge due in the die material is adopted Rapid Tool Steel, and the trade mark is the W18Gr4V material.This material after heat treatment, hardness is HRC64～68.The common knife edge due of its hardness ratio, the trade mark are that Gr12 exceeds 10%, all are better than common knife edge due in thermoplasticity and wear resistance, and can improve 50% working life, also can guarantee the stable of die-cut raceway groove precision and quality simultaneously.
Three of critical process: last end annulus opening surface behind cylinder lasso, plastic cage, three kinds of part combine and assemble of the steel ball finished product forms technology.At first cylinder lasso one end face that higher hardness is arranged is made the temper softening treatment process, adopt the novel high-frequency indcution heater, its model is CX2030C, and this equipment can carry out surface heat to round finding to be handled and tempering, also has brazed shank tool finding function.In tempering operation, the induction coil of difformity and size can be installed on the equipment heating source, the high frequency frequency adjustable is whole, and temperature can be transferred to required scope; To cylinder lasso soft temper, temperature is 450～550 ℃.And special fixture and feed mechanism are arranged in operation, and temper time also is adjustable to correct position, and is responsible for operation by the special messenger.5mm～8mm position hardness with cylinder lasso one end face by the indcution heater tempering remains on HB150～200N/mm
2Carry out flanging with press machine below 5 tons then and form the open circles anchor ring.Microgroove crack or coarse uneven phenomenon can appear in the crooked position that seals in punching press really up to the mark, and soft excessively at punched openings end face area meeting puckering phenomena, the both will influence the product appearance quality, also is three of critical process therefore.
Each accessory of miniature linear bearing is prepared to put in place, can assemble it.Manufacturing process is as follows: at first the cylinder lasso of machine shaping, plastic cage are cleaned clean the processing once more, then the cylinder lasso is measured grouping with ending drift, what conform to apolegamy assembling steel ball gauge puts same position again.Adopt special-purpose assembly fixture in the assembling earlier, this anchor clamps internal diameter size is identical with cylinder lasso internal diameter by the steel cylindrical body, and wherein a steel ball groove position is to put the used breach of steel ball to open, and steel ball is put into the usefulness of plastic cage raceway in assembling.
During assembling plastic cage is filled in the cylindrical body anchor clamps, steel ball rolling channel 4 in opening aligning plastic cage 2, be put into the steel ball rolling channel 4 of plastics maintenance from opening adorning steel ball, after piling plastic cage being rotated next raceway position aligns with chucking opening, steel ball is put into again in the raceway 4 of plastic cage, with with quadrat method all piling steel ball in the raceway on the plastic cage, a raceway 4 steel balls that expose up, again adorning cylinder lasso 1 and cylindrical body grip alignment on same linear position.Simultaneously, cylinder lasso one end aligns with the projection 9 of plastic cage end face towards jagged 8, sealing raceway 4 on the plastic cage that has steel ball is aimed at steel ball slot rolling 5 on the cylinder lasso, together push in the cylinder lasso steel ball, plastic cage are housed like this, plastic cage end face projection and cylinder ring face breach are matched.Steel ball is relative with cylinder lasso slot rolling 5 on the sealing raceway 4 on the plastic cage.Next, the gap of this product is checked, adopted special-purpose air pressure holding device, the cylinder lasso that steel ball is housed is put into air clamp, pressurization clamps the back with ending the drift check.Found pine or tension, when tolerance is overproof, transposing steel ball gauge size, after reaching tolerance range, seal by adopting special fixture that flanging is carried out in the upper end on the little press machine again, for keeping product reliability, the back product is sealed in flanging on air clamp, carry out integral body adjustment inspection for the last time with the flexibility rod, qualified to reach product 100%.
Claims (3)
1. the cylindrical sleeve circle manufacturing method of miniature linear bearing, miniature linear bearing comprises cylinder lasso, plastic cage and steel ball, the cylinder lasso is by the die-cut drawing and forming of sheet metal, on cylinder lasso (1), establish 4～8 equidistant steel ball slot rollings (5) that are parallel to each other vertically, the chamber wall of plastic cage (2) be provided with the cylinder lasso on the axial corresponding oval raceway of slot rolling (5) (4), the two ends of cylinder lasso (1) is characterized in that for inwardly curving the toroidal surface (10,11) of middle opening the manufacture method of described cylinder lasso may further comprise the steps:
1), the low carbon steel cold rolled sheet is die-cut into circular base substrate;
2), circular base substrate is carried out on the press machine of drawing die stretching the first time being equipped with, tensile elongation is 25～35% of a cylinder lasso total length;
3), will carry out stretching second time on the hydraulic machine of drawing die being equipped with through the base substrate that stretches for the first time, tensile elongation is a cylinder lasso total length 80～90%;
4), will carry out the destressing soft temper through the cylinder lasso base substrate that stretches for the second time, tempering furnace is the sealing pit-type furnace, 500～600 ℃ of tempering temperatures, arrive temperature after insulation came out of the stove in 1 hour, in air, cool off, and with cleaning solution clean surface impurity;
5), the cylinder lasso base substrate of crossing through temper stretches for the third time, with stretching and the attenuation mould is stretched to 105～110% of total length on hydraulic machine, and the two ends of cylinder lasso are respectively accounted for length 15～20% positions stretch progressively that attenuation becomes the inclined-plane;
6), smooth to carry out end face through the cylinder lasso opening end after three stretchings;
7), opening end being passed through smooth cylinder lasso is being equipped with on the press machine of blanking die the locating notch on its bottom centre punched openings toroidal surface and the toroidal surface;
8), the cylinder lasso that will stamp out toroidal surface is placed on and carries out die-cut slot rolling on the punch press that many side blows groove cylinder mould is housed;
9), the cylinder lasso that carries out die-cut slot rolling is carried out surface finish, flash removed and treating selvedge with buffing machine, surface roughness reaches 0.8 μ m;
10), the cylinder lasso that carries out surface finish, flash removed and treating selvedge is carried out carbonitriding heat treatment and vacuum heat treatment, surface hardness reaches HV660～790, carburized layer thickness 0.2mm～0.3mm.
2. the cylindrical sleeve circle manufacturing method of miniature linear bearing according to claim 1, the mould and die accuracy tolerance≤0.05mm that stretches for the third time of cylinder lasso, mold work surface roughness≤0.2 μ m.
3. the cylindrical sleeve circle manufacturing method of miniature linear bearing according to claim 1 is characterized in that the axial slot rolling width tolerance≤0.05mm on the same cylinder lasso, each slot rolling spacing tolerance≤0.10mm.
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| CN2008101210800A CN101368594B (en) | 2008-09-24 | 2008-09-24 | Miniature linear bearing and manufacturing method thereof |
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| CN2008101210800A CN101368594B (en) | 2008-09-24 | 2008-09-24 | Miniature linear bearing and manufacturing method thereof |
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| CN101368594B true CN101368594B (en) | 2011-02-02 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI500856B (en) * | 2012-12-11 | 2015-09-21 | Chieftek Prec Co Ltd | Circulating channel structure of linear slide |
| CN103470634B (en) * | 2013-09-25 | 2016-04-13 | 宁波恒力汽配轴承有限公司 | A kind of linear bearing retainer and processing technology thereof |
| CN104841720B (en) * | 2015-05-12 | 2017-06-16 | 攀钢集团成都钢钒有限公司 | The method that heavy caliber thick wall Gr15 bushed bearings are produced with steel ingot |
| CN106402156A (en) * | 2016-11-01 | 2017-02-15 | 宁波美亚特精密传动部件有限公司 | Cage and linear bearing with same |
| TWI661135B (en) * | 2018-01-03 | 2019-06-01 | 直得科技股份有限公司 | Structure of micro sliding base and linear slide rail |
| US11852192B2 (en) * | 2018-11-27 | 2023-12-26 | Thk Co., Ltd. | Motion guide apparatus |
| CN112222261A (en) * | 2020-09-25 | 2021-01-15 | 中国航发哈尔滨轴承有限公司 | Machining method for joint bearing notch |
| CN114242952B (en) * | 2021-12-17 | 2023-12-08 | 蜂巢能源科技(无锡)有限公司 | Forming method and forming device for electrode plate of lithium ion battery |
| CN114905340A (en) * | 2022-05-06 | 2022-08-16 | 宁波鸿云精密机械有限公司 | Surface grinding process for bobbin case of sewing machine |
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