Fixture for precision hemispherical part milling and grinding machining
A hemisphere and parts technology, applied in the direction of manufacturing tools, metal processing equipment, metal processing machinery parts, etc., can solve the problems of uncontrollable word uniformity, complex mechanism, etc., to ensure reliability and durability, improve positioning accuracy, pressure uniform effect
Active Publication Date: 2020-04-03
BEIJING INST OF AEROSPACE CONTROL DEVICES
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Problems solved by technology
[0004] Currently, the milling buffer mechanism is installed on the grinding wheel, the mechanism is complicated, and the uniformity of the word cannot be controlled during milling
Method used
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Embodiment
[0033] A fixture for milling and grinding precision hemispherical parts, such as figure 1 , It is mainly composed of base and connecting rod.
[0034] Such as figure 2 , The main body of the base is a tapered thin-walled structure with a wall thickness of 1mm. There are 24 horizontal slender grooves evenly distributed on the cone surface. The groove width is 1mm. The vertical distance between the grooves is 1mm. The horizontal section of the grooves is arc-shaped and round. The arc is 270°, and the arc grooves of each layer are distributed across the vertical plane. Both ends of the groove are semi-circular with a radius of 0.5mm to avoid areas of stress concentration due to deformation.
[0035] The base material is beryllium bronze with a modulus of elasticity of 1.28×10 5 MPa, Poisson's ratio 0.29, yield strength 1.17×10 3 MPa, can realize the micro displacement of the flexible structure.
[0036] The top of the base is a positioning plane, the center has a connecting rod mounti...
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The invention relates to a fixture for precision hemispherical part milling and grinding machining. The fixture comprises a hemispherical part, a connecting rod and a base. The base is of a conical thin-wall structure. The top surface of the base is a locating plane with the diameter less than that of the hemispherical part. The center of the plane is provided with a locating hole used for mounting the connecting rod. The diameter of the bottom surface of the base is at least twice larger than that of the top surface of the base. The base is connected with machining equipment. The hemispherical part is mounted at the upper end of the connecting rod and is located through the top surface and the outer circle of the connecting rod. Multiple layers of horizontal long and thin grooves are uniformly distributed on the conical surface of the conical thin-wall structure. The perpendicular distance between the grooves is consistent with the width of each long and thin groove. The horizontal cross section of each groove is in a circular arc shape. Each layer of arcs are distributed in a crossed mode in the vertical plane, generate elastic deformation along with different milling and grinding pressure during machining of the hemispherical part and implement self-adaptive adjustment on locating of the hemispherical part. The two ends of each groove is semicircular to prevent occurrence ofa stress concentration area due to deformation. The fixture for precision hemispherical part milling and grinding machining guarantees the milling and grinding machining quality and efficiency of theprecision hemispherical part and meets the requirements for the precision and surface roughness of the part.
Description
Technical field [0001] The invention belongs to the technical field of mechanical processing, and relates to a fixture for milling and grinding precision hemispherical parts. Background technique [0002] Precision hemispherical parts Precision hemispherical parts have small size (ball diameter less than 15mm) and high accuracy. The roundness of the circular section is less than or equal to 0.3μm, the surface roughness Ra is less than or equal to 0.025μm, and the surface of the part has TiN coating before milling. , The thickness of the film is 0.02-0.03mm, and the amount of the film removed during the milling process is within the range of 0.005-0.015mm; the final accuracy requirements of the parts must be achieved through multiple milling processes. [0003] The milling processing method is more efficient, the amount of material removed per unit time is large, and the cutting force is correspondingly large. If there is a large difference in the pressure of the grinding head on th...
Claims
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IPC IPC(8): B24B41/06B23Q3/06
CPCB23Q3/062B24B41/067
Inventor 唐照芳邱增帅
Owner BEIJING INST OF AEROSPACE CONTROL DEVICES