Schunk Sinter Metals
Suraj Components is popular among the design, development, manufacture and supply of sintered bearings and is well placed to serve the local as well as the international market. With the increase in the price of copper in recent years, there has been greater demand for sintered bearings made of materials that can be used as a substitute for bronze bearings. In the event that your requirements cannot be met by stock items, our bespoke service enables us to produce both bronze and iron Oilite bearings and customer specific structural parts that are specifically designed to meet individual requirements. You might also be interested in the range of Pulleys – Blocks – Eye – Fixed on the Miniature Bearings Australia site. When the content of C contained in the Cu—Ni raw material powder is less than 0.02 mass%, there is nothing that suppresses the sintering of the raw material powders, so that the sintering is promoted and the size is reduced by the sintering. To summarize, much larger amount of oil was retained in the bearing clearance for the PTFE-coated shaft (i.e., low wettable shaft) than that for the noncoated shaft (i.e., highly wettable shaft), and oil circulation in the bearing clearance (along with shaft rotation) was observed for the PTFE-coated shaft. The area occupied by the Cu phase relative to the area of the inner circumferential aluminium bronze surface S in the central portion 6AS of the straight hole portion 6a formed in the first region 6A is preferably 80% or more and preferably 100% or less, but is not limited thereto. The area ratio of the Cu phase in the central portion 3CS along the shaft line of the third region 3C can also be computed in the same manner. We focused on the oil amount on the shaft and in the bearing clearance first as a cause of the friction reduction of the PTFE-coated shaft. There is a report that a low oil-wettable surface showed low friction due to the slip between the oil and the surface especially under fluid lubrication condition 9 Some processing, coating, doping, etc., on the surface is usually necessary to provide low oil wettability to metal surfaces and needs additional cost. Low oil-wettable shaft could retain a larger amount of oil in the bearing clearances and indicated lower friction than highly wettable shaft. A sintered bearing unit (comparative example 1) in which a sintered bearing impregnated with normal lubricating oil is unitized according to the configuration shown in FIG. The energized sintered bearing unit according to any one of claims 1 to 9, wherein an axial position restricting portion that restricts an axial relative movement of the energized sintered bearing and the shaft is provided on the shaft. The area occupied by the Cu phase relative to the area of the inner circumferential surface S in the central portion 4AS of the straight hole portion 4a formed in the first region 4A is preferably 80% or more and preferably 100% or less, but is not limited thereto. Note that bearing frictional torque is usually different from that of the shaft. Through unequaled metallurgical expertise, industry-leading manufacturing capabilities, and comprehensive product testing, we provide innovative sintered bearings that maximize long-term reliability, and minimize production and maintenance costs. The pressure of the oil film formed in the bearing gap increases, and the rotation support function improves. It is also possible to configure a1 and the relief portions 50a2, 50a3 (the entire inner peripheral surface 50a) by one R surface (convex arc surface). Friction coefficients of oil-impregnated sintered bearings with stainless steel shafts were measured. In the straight hole portion 4a, the lubricant is caused to flow out from the inside of the bearing main body 1 by a pumping action by the rotation of the rotating shaft 2 and thermal expansion by friction heat, and the friction surface is lubricated. Oilite bearings continue to set the standard for all other self-lubricating bearings and Bowman International is proud to be the sole supplier of genuine Oilite bearings in the UK and Europe in partnership with Beemer Precision Inc. The bearing main body (sintered body) 1 is formed of a Fe—Cu-based sintered metal (Fe—Cu-based sintered body). Designed for harsh operating conditions, the AuGlide lead-free bearings feature a bimetal composition—steel backing and a bronze overlay—that earns RoHS compliance. The bearing 20 having the above-described configuration is used in a state in which, for example, the bearing main body 1 is impregnated with a lubricant and the rotating shaft 2 is inserted into the bearing hole 4. FIG. The Sn high-concentration alloy layer 14 includes inner surfaces of internal pores 12a that are present in the Cu-based sintered member 10, inner surfaces of open pores 12b that are formed open on the surface of the Cu-based sintered member 10, and open pores 12b. A larger range of Bearings – Self Clinching – Miniature – Self Aligning might be available on the Bearing Shop Online site.
The combination of these properties with the excellent oxidative stability and superior anti-wear performance makes the Tacbecon Sintered Bearing Oil Series the popular choice to lubricate sintered bearings, optimising the equipment uptime. In a bearing obtained through the above-described steps, the area ratio of the Cu phase has been adjusted not to change significantly throughout the entire inside surface of the bearing hole by the core rod sliding step, and even when the rotating shaft is rotated at a high speed, it is possible to reliably prevent the local abrasion of the inner circumferential surface of the bearing hole that is configured to receive the rotating shaft or a local increase in the friction force. Most of the sintered bronze bearings supplied by THN are made from SINT A51 or a comparable material, and are 18% – 20% impregnated with mineral oil. 1 shows a ring-shaped bearing (Cu-based sintered bearing) 1 made of a Cu-based sintered member 10 of the present embodiment. Along with the above operation, the inner peripheral surface 11a of the sintered bearing material 11 is pressed against the master form 13a of the core rod 13, and the region pressed against the maser form 13a becomes plastic deformation. Next, the obtained sintered body was stored in a mold, and sizing was performed by applying a predetermined pressure within a range of 200 MPa to 700 MPa. 3. The oil-impregnated sintered bearing according to claim 1, wherein the Cu phase formed of Cu powder including Cu-based flat raw material powder is formed in the first region, and an area occupied by the Cu phase relative to an area of the inner circumferential surface in a center along the shaft direction of the first region is 50% or more. The pores 12 impregnate and store the lubricating oil, and have an effect of increasing the wear resistance of the bearing 1 by supplying the lubricating oil when the bearing 1 slides with the counterpart member (for example, the shaft 2 shown in FIG. To allow efficient stacking of product in the furnace during sintering and to prevent parts sticking together, many manufacturers separate ware using ceramic powder separator sheets. In the present embodiment, the first region 3A, the second region 3B, and the third region 3C set in the inner circumferential surface S of the bearing hole 3 are set to evenly trisect the entire length of the bearing hole 3 along the shaft line The first region 3A, the second region 3B, and the third region 3C can be set to divide the entire length of the bearing hole 3 along the shaft line at random proportions. The electric sintered bearing 50 is formed in the cylindrical shape with a porous material made of sintered metal, inner pores of which are impregnated with conductive oil. Specifically, Fe powder and Cu powder are introduced into a mold having a core rod inserted into a cavity, and a Fe—Cu-based sintered body is shaped, thereby shaping a sintered body including a through hole that is a straight hole as a whole. Such stress concentration can lead to undesirable effects for the oil-impregnated sintered bearing, such as wear of the bearing surface of the oil-impregnated sintered bearing and generation of unusual noise. In such a case, it is possible to improve the ratio of the Cu phase in the surface of the pressurization portion of the core rod 34 during pressurization. Genuine Oilite Sintered Bronze designed to be fitted in H7 housings and f7 shafts. In the present embodiment, the first region 4A, the second region 4B, and the third region 4C set in the inner circumferential surface S of the bearing hole 4 are set to evenly trisect the entire length of the bearing hole 4 along the shaft line The first region 4A, the second region 4B, and the third region 4C can be set to divide the entire length of the bearing hole 4 along the shaft line at random proportions. In an oil-impregnated sintered bearing, the inside of a sintered body is impregnated with a lubricant in advance, the oil is caused to flow out by a pumping action by the rotation of a shaft and thermal expansion by friction heat, and a friction surface is lubricated. In Fe—Cu-based sintered bearings of the related art, the areas occupied by the Cu phase significantly differ in a portion that has been in the upper side of the cavity during shaping and a portion that has been present in the lower side, and there have been cases where local abrasion or the like occurs during the high-speed rotation of rotating shafts. Oil wettability of the shaft surfaces was found to have a large effect on the friction of those bearings. The most important characteristics of sintered bronze sliding bearings is that the bearings are mainly suitable for hydrodynamic, lubricated conditions or high rotation speeds. The above oil-impregnated sintered bearing device can be suitably incorporated for use into a power transmission mechanism for an automotive power window.
Therefore, it becomes possible to rotate the rotating shaft 2 at a high speed even in any of a state in which the rotating shaft 2 comes into contact with the straight hole portion 4a without bending and a state in which the rotating shaft 2 bends and comes into contact with the enlarged diameter portions 4b and 4c. It becomes possible to reliably prevent the local abrasion of the inner circumferential surface S of the bearing hole 4 that is configured to receive the rotating shaft 2 in any of the straight hole portion 4a or the enlarged diameter portions 4b and 4c or a local increase in the friction force. Describes the features of the LED and LES which are often used as the alternatives for the sintered bearings, and those of the sintered bearings. Miniature Bearings Australia products are not authorised for sale into the USA or Canada due to the reluctance of Australian insurers to provide product liability insurance into those two countries. The oil-impregnated sintered bearing 1 is produced, for example, by the following process. Bearings—including ball, roller, and others used in critical applications—require high-quality oils and greases to ensure smooth-running performance. That is, an oil-impregnated sintered bearing that is an aspect of the present invention has the following configuration. The dimensions of the sintered body (sintered sliding material) after sintering were measured, and the dimensional change rate before and after sintering was calculated. In the method for producing a Cu-based sintered bearing of the present invention, graphite powder is mixed in addition to the raw material powder, and the total of C contained in the raw material powder and C derived from the graphite powder is 0. It is good also as 0.02 mass% or more and 4 mass% or less. Sintered bearings are also called self-lubricating bearings and are manufactured from a pressed metal powder that forms a porous bearing material. Figure 5 shows the friction coefficients of the bearings calculated by Eq. (1) with PTFE-coated and noncoated shafts. The cross-sectional shape of the bearing hole 3 in a surface orthogonal to a shaft line in the longitudinal direction of the rotating shaft 2 forms a circular shape, and the inner diameter of the bearing hole is set to be constant throughout the entire length along the shaft line In the present invention, in an inner circumferential surface S of the bearing hole 3, a first region 3A forming a central portion along the shaft line , a second region 3B forming a first end portion 3A1 of the first region 3A through a first opening 3E1 of the bearing hole 3, and a third region 3C forming a second end portion 3A2 of the first region 3A through a second opening 3E2 of the bearing hole 3 are set. 3A, the die 12 is at a lower axial position with respect to the sintered bearing material 11, and the core rod 13 and the upper punch 14 are at upper axial positions with respect to the sintered bearing material 11. The lower punch 15 is slidably inserted into the shaping hole of the die 12, and the forward end of the lower punch 15 is at the same position as the upper end of the shaping hole of the die 12 or slightly protrudes from the upper end of the shaping hole of the die 12. The sintered bearing material 11 as a workpiece is arranged on the forward end surface of the lower punch 15. The radial sizing interference S of the sintered bearing material 11 is set, for example, within the range of 30 μm to 300 μm. Further, the maximum radial gap between the sintered bearing material 11 and the core rod 13 at the time of insertion of the core rod 13 is set somewhat smaller than the sizing interference S. These powders are formed to parts under high-pressure conditions and then sintered. In the figure, the sintered bearing material 11 is formed by compacting a powder mainly consisting, for example, of the above metal, or an alloy obtained through an arbitrary combination of the above-mentioned materials, into the configuration as shown in the figure, and by burning it. At the stage prior to the sizing, the configuration of the sintered bearing material 11 is such that the region of its inner peripheral surface 11a corresponding to the bearing surface is straight over the total axial length. Keystone manufactures sintered bearings in bronze and a proprietary high-graphite iron. 1 is a cross-sectional view showing an oil-impregnated sintered bearing according to a first embodiment of the present invention. 2 is a cross-sectional view showing the oil-impregnated sintered bearing according to the second embodiment of the present invention along a shaft direction of a rotating shaft. That is, the core rod sliding step is a step of collecting the Cu powder in a portion with which the core rod comes into contact in the cavity and adjusting the disposition of the Cu powder.
- The current-carrying sintered bearing according to claim 12, wherein relief portions are provided in both end regions of the inner peripheral surface. The aerospace industry requires low friction bearings with excellent wear resistance to help reduce labor costs. Therefore, it is possible to mix the Fe powder 41 and the Cu powder 42 in the cavity P and selectively dispose the Cu powder 42 in the powder mixture 43 around the core rod. Specifically, Fe powder and Cu powder including Cu-based flat raw material powder are introduced into a mold having a core rod inserted into a cavity, and a Fe—Cu-based sintered body is shaped, thereby providing the bearing main body 1 including the bearing hole 3. A production method for the above-described bearing 10 will be described below. An oil-impregnant sintered bearing is made by providing an internal diameter (4), which a rotating axis is inserted through, in a bearing main body (3), formed by a porous sintered alloy having internal pores therein, and providing a sliding face (5) in one region of the inner peripheral face (2) of the internal diameter, the sliding face (5) being obtained by closing the pores which have been opened in the inner peripheral face. Specimens used are described in Table 1 The oil-impregnated sintered bearing used is commercially available mainly for OA equipment, and the size was relatively small. This property may have caused the oil droplet circulation in the bearing clearance for the PTFE-coated shaft. In a durability test actually conducted by the present inventors, the wear amount of the oil-impregnated sintered bearing 1 after 500 hours of testing was 3 μm, and the wear amount of the oil-impregnated sintered bearing 1 after 3000 hours of testing was 5 μm. Thus, after either testing, no marked deterioration in the power transmission function of the power transmission mechanism for a power window was to be observed, thus proving the usefulness of the present invention. In the measurement, a sliding test was carried out by rotating the rotating shaft 2 in a state in which a load was applied to the central portion 3AS along the shaft line of the first region 3A in the oil-impregnated sintered bearing 10 shown in FIG. That’s what makes us a strong and reliable partner for slide bearings, finished products and everything to do with non-ferrous metals and steels – shake on it. The electro-sintered bearing 50, the shaft 51 inserted through the inner periphery of the electro-sintered bearing 50, and the washer 52 as an axial position restricting portion. Therefore, in the inner circumferential surface of the bearing hole, the area occupied by the Cu phase increases as the region comes closer to the upper side during shaping. In the bearing that is the aspect of the present invention, in the inner circumferential surface of the bearing hole, the area ratio of the Cu phase in the central portion of the second region is set to 80% or more and 100% or less of that in the central portion of the third region. When the above-described powder mixture 43 is simply dropped from the upper side of the cavity P in the vertical direction in the material loading step, the amount of the Cu powder 42 is attached to the surface of the core rod 34 increases toward the upper side of the cavity P; however, in the present invention, the core rod sliding step of sliding the core rod 34 upwards in the cavity P is carried out together with the material loading step, and thus the disposition of the Cu powder (Cu foil pieces) 42 is also adjusted in the lower side of the cavity P (refer to FIG. Sintered metal powder is used to make frangible shotgun shells called breaching rounds , as used by military and SWAT teams to quickly force entry into a locked room. For example, the clearance was set to approximately 10 μm in the sample 9 and set to approximately 70 μm in the sample 10. In addition, for comparison, an oil-impregnated sintered bearing in which the taper angle θ1 was 0°, that is, the same bearing hole 3 as in the first embodiment has a straight tube shape was regarded as a sample 8 (comparative example). 9, it was confirmed that the friction coefficient of the sample 7 was significantly higher than those of the samples 5 and 6 and an effect for decreasing the friction coefficient could be obtained by setting the ratio of the Cu phase in the central portion 3AS in the oil-impregnated sintered bearing 10 shown in FIGS. Most sintered bronze bearings are oil-filled. The porosity was measured according to the open porosity test method JPMA M 02-1992 for sintered metal materials. Moreover, since the electrically conductive sintered bearing made of sintered metal can be manufactured at lower cost than the rolling bearing, the cost can be reduced. The manufacturing method of the Cu-based sintered bearing 1 will be described in detail later.
By using the Cu-based sintered member 10 having a composition in which Cu is dominant as the bearing 1, seizure with the shaft made of the Fe-based alloy is less likely to occur. The porosity of the surface is preferably set in the range of 10 to 40% from the viewpoint of ensuring proper circulation of the energized oil and a good rotation support function. 1.1 Sintered Bronze bearings are all self-lubricating and maintenance free. An enlarged photograph of the central portion 3BS along the shaft line of the second region 3B and an enlarged photograph of the central portion 3CS along the shaft line of the third region 3C in the bearing 10 shown in FIG. Since 0a2 and 50a3 are provided, the electro-sintered bearing 50 can perform centering movement (oscillation displacement in the axial direction) with respect to the shaft 51, whereby the charging roller (40) has a non-printing area ( 30a, 30b) can always be in close contact. Our team of engineers can aid your design department in the application and design of bearings and their associated components, along with sintered shapes. In addition, in Fe—Cu-based sintered bearings of the related art, the areas occupied by the Cu phase significantly differ between a portion of the cavity that was the upper side and a portion that was the lower side during shaping, and local abrasion or the like is caused when the rotating shaft is rotated at a high speed. The present invention relates to an oil-impregnated sintered bearing obtained by impregnating a porous body formed of a sintered metal with a lubricant (lubricating oil or lubricating grease). The schematic view of the shaft and bearing is shown in Figure 2 As can be considered from these oil supply mechanisms, oil amount in the bearing gap is usually smaller than fully lubricated bearings and sometimes insufficient for good lubrication. In this electrically conductive sintered bearing unit, the washer 52 is restrained from slipping off in one axial direction (leftward in FIG. Métafram sintered bearings are porous, lubricant-containing plain bearings made of bronze BP 25 or iron FP 20. The rotating shaft removes lubricating oil from the pores by means of a suction effect. To discover more about how the technology has revolutionised component production, browse our Introduction to Powder Metallurgy. Smaller friction of the PTFE-coated shaft was probably attributable to this oil-rich condition. This wear test assumes that the sintered bearing is rotated at a high speed with a high surface pressure. THN can also supply sintered iron or bronze bearings with MoS2. In the related art, in the production of an oil-impregnated sintered bearing made of a Fe—Cu-based sintered metal for which the above-described Cu-based flat raw material powder is used, a mold is installed so that a shaft direction lies in the vertical direction, and a powder mixture made up of Fe powder and Cu powder is loaded from an upper side of a cavity into which a core rod has been inserted. Furthermore, the diameter of the through hole in the sintered body is expanded up to a predetermined depth on both sides by sizing, thereby forming the bearing main body 1 including the straight hole portion 6a and the enlarged diameter portions 6b and 6c. 1 (comparative example 1), a rolling bearing in which a conductive grease is filled in a metal shaft is attached to a conductive rolling bearing ( Regarding Comparative Example 2), the current-carrying characteristics were measured under the following conditions. 3. An oil-impregnated sintered bearing as claimed in claim 1 or 2, wherein the crowning portion is formed by a tapered surface whose inclination angle ranges from 0.1 to 3 degrees. Their high permissible sliding velocities make these sintered bronze bearings ideally suited to rotating applications. 2, in the Cu-based sintered member 10, a plurality of particles (Cu—Ni main phase grains) 11 are integrated with each other through a pore 12 (internal pore 12a and open pore 12b) at the grain boundary portion. The Cu-based sintered bearing according to claim 1, wherein the content of P is 0.2% by mass or more and 0.4% by mass or less. Therefore, on the surface of the core rod 34 for shaping the bearing hole 3, the disposition of the Cu powder 42 is adjusted from the lower side through the upper side of the cavity P. NTN Corporation has announced further additions to its BEARPHITE range of sintered bearings. Mass movements that occur during sintering consist of the reduction of total porosity by repacking, followed by material transport due to evaporation and condensation from diffusion In the final stages, metal atoms move along crystal boundaries to the walls of internal pores, redistributing mass from the internal bulk of the object and smoothing pore walls. Sintered bronze rod is supplied oversized so it can be machine finished to the dimensions shown.