Plain bearing and method of its manufacture

FIELD: wood working industry.

SUBSTANCE: plain bearing is made from compressed impregnated wood with a radial arrangement of fibres and uniform density along the whole section and contains greasing in amount 7-8% from the wood mass, and metal inclusion. The wood of the bearing contains nano-crystalline cellulose in the amount 0.5-0.8% from the wood mass, and the metal inclusion is implemented as a continuous nickel film in amount 4-6% from the wood mass with the width 0.8 mcm, covering internal surface of wood completely. The method of manufacture of the named plain bearing is also offered which comprises the manufacture of segments (4) of compressed impregnated wood with a radial arrangement of fibres and radiuses of rounding of the future bearing, application of glue, installation into auxiliary cartridge clip (1), pressing through a cone (2) with a cone angle (2), allowing to increase a density up to the value 1350 kg/m3 minimum, glue solidification and, if necessary, machining job along an internal diameter with a minimum rough tolerance.

EFFECT: improvement of quality of a plain bearing and decrease of manufacture complexity.

2 cl, 6 dwg, 1 tbl

 

The invention relates to woodworking industry, in particular the production of parts friction of wood.

Known sliding bearing made of pressed wood with a radial arrangement of fibres and uneven density in the cross section containing anti-friction substances (ed. mon. The USSR №926397, IPC F16C 33/12, 1982)

The disadvantage of bearing is that at high loads the peripheral zone of crushed and the bearing fails.

There is a method of metallization of wood by its saturation vapour tetracarbonyl Nickel and thermal decomposition, resulting in the Nickel content in the wood is 15-20% by weight of the wood (see U.S. Pat. RF 32339505, IPC B27K 5/06, C23C 16/16, 2008) the Disadvantage of this bearing material is its high cost due to the high cost of Nickel.

There is a method of bonding of modified wood, when to increase the strength of the adhesive joint in the adhesive composition type nanocrystalline cellulose as 8-10% by weight of the resin (see Patent RF №2454444, IPC C09J 5/00 C09J 61/24, B82B 1/00, 2012). The disadvantage of this method is that it does not increase the strength of the modified wood.

The prototype is a sliding bearing made of pressed wood with a radial arrangement of fibres with uniform density p the whole section, containing lubricant to 15% by weight (see C. A. Shamaev, A. I. Smolyakov, P. A. Smirnov, B. N. Ivanovskaya, A. E. Chaadayev. Pressed wood in mechanical engineering. Reference, Voronezh, VGTL, 2005, S. 10, Fig.1.18).

This bearing is the most abrasion resistant and can withstand large statistical load. The disadvantage of bearing is a low wear resistance under dynamic loads and low thermal conductivity.

The invention solves the problem of increasing the wear resistance and thermal conductivity of the bearing.

This object is achieved in that the slide bearing made of modified wood with a radial arrangement of fibres and uniform density throughout the cross section containing the lubricant in the amount of 7-8% by weight of wood and metal turning, according to the invention the wood bearing contains nanocrystalline cellulose in the amount of 0.5 to 0.8% by weight of the wood, and metal inclusion is made in the form of a continuous film of Nickel with a thickness of 0.8 μm in an amount of 4-6% by weight of the wood lining the entire inner surface of the wood.

A method of obtaining drevesnoopilochnyh bushings in which the liners are rectangular pressed through the cone forming the sleeve and infiltrating anti-friction substances (see ed. mon. The USSR №863429, IPC B32B 13/00, B27M 1/02, 1981).

N the income method is that it is not possible to obtain a sliding bearing with a uniform density of wood in the cross section.

The closest known (prototype) is a method for bushings, including cutting out segments of pressure-treated wood, glue, forming in the workpiece bushings, bonding in an autoclave and subsequent machining internal and external diameter (see ed. mon. The USSR №409854, IPC B27d 1/08, B29c 27/10, 1974). The disadvantage of this method is its complexity, because there is a necessity of grinding the workpiece on the outer and inner diameter. In addition, according to this method, it is impossible to adjust the final density of the bearing in the direction of increasing that it is not possible to improve the wear resistance.

The invention solves the problem of increasing the quality of the sliding bearing and reduce the complexity of the manufacturing process.

This object is achieved in that in the method of manufacturing a sliding bearing including manufacturing segments of pressure-treated wood, glue application, installation in a satellite cage, pressing through the cone into the receiver, gluing and machining, according to the invention the segments are made with radii of curvature of the future of the bearing, the cone angle is chosen with the possibility of pre-wood to a density of not less than 1350 kg/m3and IU is onicescu processing is made according to the inner diameter of the bearing.

In Fig.1 and 2 shows a diagram of the cutting bar of pressure-treated wood into segments, Fig.3 - ready segment of Fig.4 - the shaping of the workpiece with the adhesive application and installation in the supporting ring of Fig.5 - pressing the workpiece through the cone in the receiver of Fig.6 - the finished bearing.

Low competitiveness of non-metallic bearings in comparison with ball and roller bearings of high-alloy steel due to the fact that non-metallic bearings are 2-3 times lower hardness and, consequently, less wear resistance and low thermal conductivity, which dramatically limits the range of allowable speeds (at high rpm overheating occurs in the friction zone and charred wood). To increase thermal conductivity of the bearing in the wood intended for pressing, introducing metallic Nickel in the amount of 4-6% by weight of the wood, i.e., in the amount of 0.3-0.4% of the volume of wood in the form of a solid film with a thickness of 0.8 μm, lining the entire inner surface of the wood by the method described in patent No. 23390505.

To reduce the coefficient of friction in metallic wood type a lubrication type Biol in the amount of 7-8% by weight of the wood. To give the wood is of high hardness, toughness and wear resistance together with lubricant injected into the wood nanocrystallites the cellulose (NCC) in an amount of from 0.5 to 0.8% by weight of the wood. End the receive operation pressure-treated wood is pressing bars with the method described in patent No. 2340443 to density 1250-1300 kg/m3.

The Nickel content in the wood in the amount of 4-6% provides thermal conductivity of pressed wood 12-15 W/m/K (thermal conductivity of natural wood 0.5 W/m/K), which is sufficient for heat removal from the zone of friction. When the Nickel content less than 4% of the conductivity falls several times due to discontinuities film of Nickel, and the increase in Nickel content more than 6% leads to an increase in the duration of the metallization process with two hours to 5-6 hours.

When the content nanokristallicheskoi cellulose less than 0.5% hardness pressed wood increases slightly, and get the pressed wood with the contents NFPs more than 0.8% is technically impossible due to the large volume of gel NFPs.

Pressed wood with the best indicators of the strength properties is obtained according to the method described in patent No. 2340443, in the density range 1250-1300 kg/m3. In this way it is possible for the density of 1400 kg/m3but the marriage of cracks increases several times, and the process is-low-tech.

Getting a sliding bearing on the proposed method is as follows.

Machine for cutting segments from a bar press vannoy wood cut first side faces, and then cut off the segment with the radius of the future of the bearing, as shown in Fig.1, 2, 3. On the side faces of the segments put glue and assemble them into a supporting yoke (Fig.4). Auxiliary yoke 1 is installed on the cone 2 (Fig.5), in turn, mounted on the receiver 3. The angle of the cone depends on the initial density of the segments 4 and is determined by the formula:

λ=tgρkρoD2-d2

where ρkthe density of the segment, kg/m3;

ρaboutthe density of the bearing, kg/m3;

D - inner diameter of the auxiliary casing, mm;

d - inner diameter of the receiver, mm

Next, the punch 5 procurement of segments 4 through the cone 2 pererisovyvaestsja on a hydraulic press in the receiver 3. After the hot curing glue the finished bearing (Fig.6) are removed from the holder and, if necessary, obtochuyut internal diameter with a minimum allowance of 0.4 to 1.0 mm characteristics of the bearing shown in the table.

№/№Performance propertiesThe prototype unit. mon. No. 409854 The proposed method
1Density, kg/m312001400
2Humidity, %22
3The content of the lubricant, %88
4The content of NFP-0,7
5The Nickel content, %-5
6Thermal conductivity, W/m/K0,916
7The ultimate strength in compression along the grain at
static loads, MPa150222
dynamic loads, MPa3590
8The coefficient Tr is tion at P=5 MPa, V=1.0 m/s0,060,05
9The mechanical hardness, MPa160350
10Wear, microns 1 thousand m284
11Allowable temperature in the friction zone, °C100160
12The service life of the bearing friction of belt conveyors, years (serial W/p # 208 is 1.8 years)1,22,4

Developed bearing design allows you to replace the friction not only the bearings, but the bearings.

A method of manufacturing a sliding bearing allows you to automate the process in the form of a rotary conveyor line by analogy with the process of receiving ball bearings and organize serial production. The time required for the manufacture of a bearing on the proposed method, almost twice less than the method described in the ed. mon. No. 409854.

1. The sliding bearing is made of pressed wood with racialdiscrimination fibers and uniform density throughout the cross-section, containing grease in the number of 7-8% by weight of wood, metal turning, characterized in that the wood bearing contains nanocrystalline cellulose in the amount of 0.5 to 0.8% by weight of the wood, and metal inclusion is made in the form of a continuous film of Nickel in the amount of 4-6% by weight of wood with a thickness of 0.8 μm, lining the entire inner surface of the wood.

2. A method of manufacturing a sliding bearing including manufacturing segments of pressure-treated wood, glue application, installation in a satellite cage, pressing through the cone into the receiver, gluing and machining, characterized in that the segments are made with the radius of the future of the bearing, the cone angle is chosen with the possibility of pre-wood to a density of not less than 1350 kg/m3and machining to produce the inner diameter of the bearing.



 

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