3, the development of sharpening machine
Figure 3 Drill sharpening machine motion schematic


In theory, the six coordinate motions of the space can realize the arbitrary motion of the space, so that the processing of any shape of the space can be completed. How to choose the six coordinates is a key issue to be considered when designing the machine structure. The structure of the sharpening machine we have developed is shown in Figure 3. The sharpening machine can achieve the above grinding process. The movement in the X and Y directions is to achieve the feed motion in the X and Y directions, so that the cutting point of the grinding wheel forms a desired movement trajectory with respect to the blade portion of the drill bit; a is a rotary motion of the drill bit about its own axis, having 180 The indexing and positioning function of ° achieves the symmetrical grinding of the left and right cutting edges of the drill bit. At the same time, the drill bit can be arbitrarily rotated and positioned in the direction around its own axis to complete the cutting edge of the cutting edge and achieve different rear angle grinding. The angle between the bit axis and the X axis is 30°, which ensures that the cutting edge of the bit moves in the horizontal direction (Y axis), forming a 120° angle of the drill bit; b is the rotation of the clamp around the Z axis, which can achieve different angles of repair. Grinding; Z-direction movement has three fixed positions, which are realized by the handle. When the handle and the grinding wheel head frame are rotated around the fixed fulcrum, the height of the grinding wheel relative to the drill bit will change, thereby realizing the first flank of the drill bit and the second time. The flank and chisel edge are ground to form a main rear corner, a secondary rear corner and a transverse edge. The adjustment method is simple in structure, convenient in operation and good in accuracy, and only requires three simple movements of the handle to realize a complicated adjustment and positioning movement of the grinding wheel. For grinding wheel wear or drills of different diameters, the grinding wheel can be accurately positioned by the fine adjustment device to ensure the angle of the drill bit.

The sharpening machine has the following advantages:

The new drill bit shape can be easily ground, the sharpening quality is stable, and the consistency is good;

The structure is simple, and the complicated screw motion is converted into a simple linear motion, which greatly simplifies the machine tool structure and reduces the cost;

The machine tool adjustment is simple and convenient, the operation saves time and labor, and cooperates with the special fixture to quickly complete the grinding of the various parts of the drill blade;

The wheel contour correction is very convenient and the operation is very simple.

4, sharpening difficulty conclusion <br> <br> new drill bit smaller than the standard group, and drilling performance has improved significantly. The new type of drill bit will better solve the re-grinding problem of a large number of blunt drill bits existing in the enterprise, and can realize mechanized sharpening, the re-grinding time is greatly shortened, and the durability and drilling efficiency are obviously improved. Tests have shown that under the same conditions, the axial resistance of the new drill bit is reduced by 8.3% to 19.4% and the drilling torque is reduced by 2.6% to 21.7% compared with the basic group drill. The sharpening machine has a simple structure, convenient operation and low cost, which can guarantee the promotion of new drilling types, which is bound to promote the machinery industry in China.

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