A kind of copper sliding bearing grinding rod and its manufacturing process

Abstract

The invention provides a copper sliding bearing grinding rod and a manufacturing process thereof. It includes a grinding mandrel and a resin plastic grinding head. There are center holes on both ends of the grinding mandrel. Two resin plastic grinding heads are symmetrically arranged on the outer circle of the grinding mandrel. Between the joint surface of the grinding mandrel and the resin plastic grinding head The grinding mandrel between is provided with screw groove; The thickness of the resin plastic grinding head is 2-2.5 millimeters, and its effective grinding length is longer than 1 / 2 of the width of the bearing to be ground; Wherein, the composition weight percentage of the resin plastic grinding head is as follows : Epoxy resin 618: 22-27%, plasticizer dibutyl phthalate: 3-5%, abrasive GB alumina: 65-70%, curing agent triethylenetetramine: 3-5%. The invention has the beneficial effects of convenient processing, low cost, lower hardness than the object to be ground, conforming to the grinding theory, no need for grinding paste during grinding, smooth and smooth bearing after grinding, and high geometric precision.

Description

technical field [0001] The invention relates to a copper sliding bearing grinding rod and a manufacturing process thereof, belonging to the technical field of mechanical processing tools. Background technique [0002] For the terminal processing of the copper sliding bearing working surface, the scraping method has been used for a long time. This method has high requirements for the scraping technology of the fitter, high labor intensity, low productivity, and more importantly, it is not conducive to the establishment of oil film pressure. Therefore, for High-precision bearings are now generally changed from scraping to grinding. From the theoretical requirements of grinding, the material hardness of the grinding rod should be lower than that of the bearing material. The commonly used grinding rod materials are cast iron, 45 # Steel and Babbitt, cast iron and 45 # The hardness of steel material is higher than that of copper, which does not conform to the grinding theory. Th...

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Problems solved by technology

[0002] For the terminal processing of the copper sliding bearing working surface, the scraping method has been used for a long time. This method has high requirements for the scraping technology of the fitter, high labor intensity, low productivity, and more importantly, it is not conducive to the establishment of oil film pressure. Therefore, for High-precision bearings are now generally changed from scraping to grinding. From the theoretical requirements of grinding, the material hardness of the grinding rod should be lower than that of the bearing material. The commonly used grinding rod materials are cast iron, 45 # Steel and Babbitt, cast iron and 45 # The hardness of steel material is higher than that of copper, which does not conform to the grinding theory. The hardness of Babbitt tin-based alloy is lower than that of copper, so it can be used as a grinding material. However, in addition to the difficulty in manufacturing, Babbitt alloy grinding rods also have the following defects: ⑴. Ash inclusion during pouring , resulting in local hard spots, and it is easy to roughen the bearing surface during grinding; ⑵, because the hardness of Babbitt alloy is very low, it can only be processed on a lathe, so the roughness and non-cylindricity of the grinding rod are difficult to meet the requirements; ⑶, Manufacturing higher price

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