36results about How to "Guaranteed coaxiality accuracy" patented technology

The invention provides a low-temperature and high-speed floating ring sealing test device for a rocket engine, which includes a casing, which includes a casing I, a casing II and a casing III; a stepped main shaft arranged inside the casing; The front floating ring seal assembly and the rear floating ring seal assembly; the front floating ring seal assembly and the rear floating ring seal assembly form a test chamber in the housing II. The low-temperature and high-speed floating ring sealing test device for a rocket engine according to the present invention has strong functionality, good compatibility, good performance at low temperature and high speed, and can carry out various low-temperature sealing tests of floating rings, which can verify the integrity of the floating ring assembly. The sealing performance can also be used to assess the rationality of the floating ring structure.

The invention discloses a processing technology of a robot RV speed reducer needle gear shell, and belongs to the technical field of robot RV speed reducer processing. The processing technology includes the steps that precise casting or forging is carried out on a needle gear shell blank; the needle gear shell blank is clamped after the surface of the needle gear shell blank is machined, and the rotation center of the needle gear shell blank is taken as a positioning reference; the end face of the needle gear shell blank, a bearing position of a roller pin bearing and bearing positions of two main bearings are machined; finish machining is carried out on the inner surface of the roller pin bearing according to the positioning reference; finish machining is carried out on a roller pin groove in line contact with a roller pin of the roller pin bearing according to the positioning reference; inner grooves are simultaneously machined in the bearing positions of the two main bearings in a finish machining mode according to the positioning reference; finish machining is carried out on the outer surface of the needle gear blank. The needle gear shell machined according to the steps improves machining precision and the parallelism degree of the bearing positions of the main bearings, guarantees coaxiality, the position degree and cylindricity of the main bearings after installation, achieves one-time clamping, can meet requirements of multiple process parameters, improves machining precision and installation precision of the needle gear shell, reduces accumulated errors, meets the high-precision requirements, and prolongs service life.

The invention discloses a device and method to machine root fitting holes in the sidewall of an inner chamber of a composite part. The device is a six-DOF (degree of freedom) cantilever machining device, comprising an X-directional linear moving part, a Y-directional linear moving part, a Z-directional linear adjusting part, an X'-axis cantilever hole-making unit, a Y'-axis rotary adjusting part and a Z-axis rotary adjusting part. A pneumatic motor is used as a rotary spindle power source, so that the device has small size and high speed and is suitable for machining boreholes in composites innarrow spaces. A grinding hole-making mode herein can provide reduced X'-axis force, thereby reducing deformation of cantilever structure and improving drilling precision. The six-DOF cantilever machining device and a fitting hole machining method provided herein provide integral machining for fitting holes in a deep cavity of semi-enclosed structure by single tool adjusting on a single station,and coaxiality and dimensional precision can be ensured for fitting holes of different diameters in a multi-wall plate.