Device for centering by using combination of positioning pins and supplementing sleeves
A positioning pin and differential compensation technology, applied in positioning devices, clamping, support, etc., can solve the problems of high price of self-centering positioning components, application restrictions of large workpieces, axial movement of tools, etc., and achieve simple structure and stable product quality , The effect of small workpiece deformation
Inactive Publication Date: 2011-10-05
DALIAN HUARUI HEAVY IND GRP CO LTD
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Problems solved by technology
But they all have some disadvantages: the higher the precision, the higher the price of the self-centering positioning components; the self-centering positioning clamping components are basically mechanically connected, so that the tool cannot move axially around the center, so it is not suitable for Milling and grinding process of internal gear parts
Expensive centering and positioning elements severely limit the application of self-centering mass production fixtures for large workpieces
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[0019] The centering device provided by the present invention is mainly composed of a positioning pin 2, a differential sleeve 3 and a clamp body 4; the positioning pin 2 is fixed on the clamp body 4, and the differential sleeve 3 is set in the positioning On the pin 2; the number of a set of positioning pins 2 is not less than 3; in addition, the axis of the cylinder or the symmetrical center plane of the tangent plane tangent to the positioning surface of a set of positioning pins 2 constitutes the central element of the centering datum C. The wall thickness of every group of supplementary cover 3 is equal. The wall thickness of the differential sleeve 3 should be greater than half of the difference between the size of the contour element of the datum C and the positioning surface of the workpiece 1, and the greater amount should be selected according to the interference fit for centering in the national standard.
[0020] Such as figure 1 and figure 2 As shown, when the ...
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The invention discloses a device for centering by using the combination of positioning pins and supplementing sleeves, which is characterized by comprising the positioning pins, the supplementing sleeves and a fixture body, wherein the positioning pins are fixed on the fixture body; the supplementing sleeves are sleeved on the positioning pins; the number of one group of positioning pins is not less than 3; and in addition, an axis of a cylinder tangential to a positioning plane of the group of positioning pins or a symmetric central plane of a tangential plane forms a central element of a centering reference C. Compared with an equal displacement self-centering method and a uniform elastic deformation self-centering method, the tooling and the method for centering by using the combination of the positioning pins and the supplementing sleeves in the device have the advantages of no movement of positioning elements, simple structure, low cost, small deformation of workpieces, stable product quality and the like, and are suitable to be widely popularized in the process of positioning the workpieces on a machine tool in machining.
Description
technical field [0001] The invention relates to a centering device, in particular to a centering device using a combination of a positioning pin and a differential sleeve. Background technique [0002] At present, there are no more than two working principles of the centering and centering clamping mechanism, one: the positioning and clamping element moves at a constant speed (or equal displacement); the other: the positioning and clamping element is uniformly elastically deformed. Fixtures formed according to the above working principles are more common in the field of mechanical processing, such as three-jaw chucks, mandrels, elastic collets or liquid plastic fixtures. But they all have some disadvantages: the higher the precision, the higher the price of the self-centering positioning components; the self-centering positioning clamping components are basically mechanically connected, so that the tool cannot move axially around the center, so it is not suitable for Millin...
Claims
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IPC IPC(8): B23Q3/18
Inventor 章晓东
Owner DALIAN HUARUI HEAVY IND GRP CO LTD