A positioning method of a positioning device for assembling a power tool holder housing, using the positioning device for assembling a power tool holder housing, the positioning device comprising the power tool holder housing, a positioning table and elastic key blocks D, wherein the positioning device comprises the power tool holder housing, the positioning table and the elastic key blocks D, a lower cross keyway is formed in a bottom surface of the power tool holder housing, an upper cross keyway is formed in an upper surface of the positioning table;
- the lower cross keyway and the upper cross keyway are disposed in up-down correspondence;
- and the elastic key blocks D are respectively mounted in corresponding keyways of the upper cross keyway in four directions;
- each of the elastic key blocks D comprises an elastic key block body D and a trapezoidal key block;
- the trapezoidal key block is configured in a shape of a right-angle trapezoid having a larger upper side and a smaller lower side;
- and a middle of a bevel of the trapezoid key block is provided with an elongated boss in a length direction of the middle of the bevel of the trapezoid key block;
- the trapezoid key block body D is configured in a shape of a right-angle trapezoid having a smaller upper side and a larger lower side;
- a bevel of a lower portion of the boss is in contact with a bevel of the elastic key block body D, a clearance is formed between the bevel of an upper portion of the boss and the bevel of the elastic key block body D;
- and an elongated semicircular slot B is formed in a middle of the elastic key block body D corresponding to the boss;
- a tapped hole D is formed in an upper surface of the trapezoidal key block;
- four bolt mounting holes disposed in up-down correspondence with the tapped holes D are formed in a bottom of the upper cross keyway, the bolt mounting holes are eccentric holes;
- the tapped holes D in the trapezoidal key blocks are corresponding to the bolt mounting holes in the bottom of the upper cross keyway, and the tapped holes D in the trapezoidal key blocks are fixedly connected to the bolt mounting holes in the bottom of the upper cross keyway by means of bolts;
- the positioning method comprises specific operation steps as follows:
- a, fixing the positioning table to a machining table top by means of long bolts in table mounting holes at four corners of the positioning table;
- b, corresponding four sets of elastic key block bodies D to bevels of the trapezoidal key blocks, placing the four sets of elastic key block bodies D into the upper cross keyway in the upper surface of the positioning table, respectively placing the four sets of elastic key block bodies D in the four directions of the upper cross keyway;
- and bottom surfaces of the trapezoidal key blocks being higher than bottom surfaces of the elastic key block bodies D, the bottom surfaces of the elastic key block bodies D being located at the bottom of the upper cross keyway;
- the bottom surfaces of the trapezoidal key blocks being not in contact with the bottom of the upper cross keyway, and top surfaces of the trapezoidal key blocks protruding out of top surfaces of the elastic key block bodies D;
- c, pressing down the bolts in the tapped holes D to pass through the tapped holes D of the elastic trapezoidal key blocks, tightening the bolts in the bolt mounting holes of the upper cross keyway;
- compressing the trapezoidal key blocks and the elastic key block bodies D downward, and descending the trapezoidal key blocks during downward compression;
- tightly expanding lower portions of the elastic key block bodies D and the trapezoidal key blocks in the upper cross keyway, pressing the lower cross keyway of the power tool holder housing on upper portions of the elastic key block bodies D and the trapezoidal key blocks;
- corresponding side walls of the lower cross keyway compressing the elastic key block bodies D, deforming the elastic key block bodies D toward clearances between the bevels of the upper portions of the bosses and the bevels of the elastic key block bodies D, to allow two side surfaces of each of the elastic key blocks D to be completely attached to two corresponding side inner walls of the lower cross keyway, and thereby achieving clearance-free fit;
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- d, tightening compression screws at four corners of an upper surface of the power tool holder housing in four compression screw holes of the upper surface of the positioning table.