A precision lapping and polishing device for external cylindrical surface of the disk part and its taper error adjustment method thereof

A precision lapping and polishing device for external cylindrical surface of the disk part, wherein it comprises:

• a circular baseplate, two slant rails, two baffles, two pressure plates, two copper blocks, a washer bracket, two blanket plates, a set of bead shafting, a friction driving wheel, a DC motor, a mobile power supply, a LED lamp, and a cover body;
• wherein the circular baseplate is made of nodular cast iron and the ratio of its thickness to the diameter is 0.1˜0.3;
• wherein there is an inverted trapezoidal slot whose width is larger than the thickness of the disk part to be ground;
• when the disk part is fixed, the cylindrical surface of it is internally tangent to the bottom of the circular baseplate;
• on the vertical side of the inverted trapezoidal slot to the generatrix of the disk part, there is a plane orthogonal to the circular baseplate with the height of 3˜6 mm where the LED chip is attached to provide the light source for the light-gap measurement method;
• on the opposite to the plane, there is an observation slot with height of 2˜4 mm, and its width is larger than the length of the generatrix of the disk part to be ground;
• several counterbore holes are machined on the circular baseplate for fixing the slant rails and the bracket of the friction driving wheel;
• the two slant rails are connected to the circular baseplate by screws, the inclination angle between the working surface of the slant rails and the bottom surface of the circular baseplate is 60°-75°;
• a T-shaped slot is machined in the middle of each slant rail for fixing the baffles and the pressure plates;
• the two slant rails' working surfaces are coplanar after installing to the circular baseplate;
• the two baffles and two pressure plates are fixed on the slant rails respectively by screws and T-shaped nuts to realize fixing and adjusting the mandrel of disk part;
• the baffle is of L-shaped and its two working surfaces are vertical;
• the location surface with the counterbore hole contacts with the working surface of the slant rail, the other working surface of that is tangent to the cylindrical surface of the mandrel;
• the pressure plate is of inverse Z-shaped whose location surface with the counterbore hole contacts with the working surface of the slant rails;
• the angle between the pressure surface and the location surface of the pressure plate is not larger than the complement angle of the inclination angle of the slant rails' working surface;
• the inner side of the pressing surface of the pressure plate is fixed by fastening screws and the copper block is tightly contacted with the mandrel;
• a set of bead shafting consists of a mandrel, two annular-flat bead plates, a radial bead sleeve, a cross washer, a washer bracket and a lock nut;
• a shaft shoulder with an end surface perpendicular to its axis and three location shaft sections are machined on the mandrel;
• the end of shaft shoulder is an axial location datum of disk part, and its deflection error is not larger than 1 μm relative to the location shaft section of the disk part;
• the diameter deviation between two location shaft sections is not larger than 2 μm and the cylindricity is not larger than 1 μm, which is used as the location datum of the mandrel on the slant rails;
• the annular-flat bead plates and the radial bead sleeve are made of spherical rollers and copper cage;
• taking the rollers in the annular-flat bead plate contact with the mandrel shoulder and the washer bracket by controlling the preload of the lock nut;
• the washer bracket is long strip type whose thickness is 2˜3 mm, wherein there is a hole in the middle of annular-flat plate and cross washers, and the diameter of the hole is larger than the nominal diameter of the spindle thread by 0.5˜1 mm;
• the washer bracket is fixed to the mandrel by the cross washer and the lock nut, and the washer bracket extends symmetrically along the core radial direction to both sides;
• the length of the washer bracket is larger than the maximum diameter of the disk part, but not exceed the inner diameter of the cover body, wherein there is a slot in the middle of the extending section of the washer bracket, and the washer bracket connects with the L-shaped blanket plates by screws;
• the wool blanket whose length is larger than the axial width of the cylindrical surface of the disk part to be ground by 3˜10 mm is adhesive to the L-shaped blanket plate;
• the portable power is fixed on the circular baseplate;
• the DC motor and the friction driving wheel connects to the circular baseplate by the motor bracket;
• the width of the friction driving wheel is larger than the axial width of cylindrical surface of the disk part to be ground;
• the friction driving wheel is made of rubber or silica gel with larger friction coefficient, and it is sheathed on the steel shaft through the interference fit;
• the transparent cover body is covered on the external part of the device and fixed on the circular baseplate by the dowel pins.