TWI532550B - Discard drill bit - Google Patents

Description

Discard bit

The invention relates to an improvement of a disposable drill bit, in particular to a composite drill bit which integrates a center drill, a countersunk hole and a chamfer.

Bolt holes are widely used in all kinds of mechanical parts, especially for more precise combination parts. The precision between the bolt holes is very strict. Therefore, the center hole must be used for positioning during drilling. Referring to the fifth figure, the general bolt hole 50 includes a counterbore 52 and a through hole 55. The drill must be drilled into a hole 55 by a drill bit 61 along the center hole 51, and a countersunk bit 62 is processed appropriately. The countersunk hole 52 of the depth is further processed by the two chamfering tools 63, 64 to the chamfers 55 and 53 of the counterbore 55 and the counterbore 52, so that the processing of one bolt hole 50 must be completed using 5 tools, and then In addition to the long tool change time, the cost of machining tools is high, so the processing cost is high and the competitiveness is naturally reduced.

It is customary to use five tools to process the bolt holes in sequence. Therefore, the general manufacturer must prepare five tools for use on the tool master. The cost of the tool and the processing time of each tool will cause high processing costs, plus The tool change time, which results in a very long processing time for the bolt holes, is also the main reason for the high processing cost of the bolt holes.

The disposable drill bit of the present invention has a flat body, and a fixing hole is arranged in the center of the body, and two sides of the fixing hole are provided with semi-circular vacant positioning grooves, and both sides of the discarded drill bit structure The end of the straight side is set as a chamfering edge, the end of the chamfering edge is connected with a countersunk blade body, and the bottom end of the countersunk blade body is provided with a countersunk blade, the countersunk blade Extending horizontally, the end of the disposable drill bit structure is set as a center drill edge, and a connection between the center drill edge and the countersink blade is provided with a chamfering edge.

The utility model integrates a center drill, a countersunk cutter and a double chamfering cutter into one. The general drill bit can simplify the processing procedure of the bolt hole, and the processing speed is faster, the productivity is effectively increased, the production cost is reduced, and the drilling technology is made. More evolutionary.

1‧‧‧Tool body

10‧‧‧Knife

20‧‧‧Tools

21‧‧‧ 刀刀座

221‧‧‧ screw holes

222‧‧‧ column hole

23‧‧‧ Positioning rod

30‧‧‧Disposable drill bits

300‧‧‧ body

31‧‧‧Fixed holes

32‧‧‧ positioning slot

33‧‧‧ Straight side

34, 37‧‧‧Chamfering blade

35‧‧‧Surface

351‧‧‧Sinking blade

36‧‧‧Center Drill

361‧‧‧cutting trough

40‧‧‧ bolt

50‧‧‧Bolt holes

51‧‧‧ center hole

52‧‧‧ countersunk hole

53, 54‧‧‧Chamfering

55‧‧‧Perforation

61‧‧‧ drill bit

62‧‧‧ countersunk bit

63, 64‧‧‧Chamfering tools

The first figure is a three-dimensional system diagram of the present invention

The second drawing is a schematic plan view of the combination of the disposable blade and the tool body of the present invention.

The third figure is a schematic diagram of the disposable blade machining drilling of the present invention.

The fourth picture is a schematic diagram of drilling and perforating with a general drill bit.

The fifth figure is a schematic diagram of a conventional workpiece drilling bolt hole.

As shown in the first figure, the disposable drill bit 30 of the present invention is a flat body 300. The center of the body 300 is provided with a fixing hole 31. The fixing holes 31 are provided with semi-circular notch positioning grooves 32 on both sides thereof. The two sides of the disposable drill bit 30 (on the lower side of the positioning groove 32) are set as a straight side 33, and the end of the straight side 33 is set as a chamfering edge 34, and is tapered inward, the chamfering The end of the blade 34 is connected to a countersunk blade body 35. The bottom end of the countersunk blade body 35 is provided with a countersunk blade 351. The countersunk blade 351 is horizontally extended, and the end of the discarded drill bit 30 is set as a center drill. The blade 36 has the cutting groove 361, and the center cutting edge 36 is matched with different angles (60° and 120°) according to the use conditions. In the shape of a polygonal pyramid, a connection of the center cutting edge 36 and the countersink 351 is provided with a chamfered edge 37.

The body 300 of the disposable drill bit 30 has a symmetrical shape from both ends of the fixing hole 31 at the center of the body 300, so that both ends of the disposable drill bit 30 have a cutting edge, which increases the number of cutting edges of the tool, and can be improved. Cutting capacity and reducing tool costs.

Referring to the first and second figures, the disposable drill bit structure 30 of the present invention is housed in the tool body 1. The tool body 1 includes a shank 10 and a blade body 20. The blade body 20 is provided with a pocket knife. The seat 21 is provided with a screw hole 221. The screw hole 221 is provided with a column-shaped column hole 222 on both sides thereof. The position of the column hole 222 is half in the tool holder 21, and the other half is located in the blade body. In the 20th portion, the column hole 222 is inserted into a positioning rod 23, and the shape of the holder base 21 is provided with a suitable length on both sides and a vertical straight side 211, and the holder holder 21 is accommodated. The disposable drill bit 30, which is flat and has a shape opposite to that of the tool holder, is locked by a bolt 40 to form a highly rigid drill bit structure.

Referring to the third and fourth drawings, an embodiment of the drilling process of the present invention, the disposable drill bit 30 of the present invention (shown in the second figure) has a center drill edge 36, a countersunk edge 351 and a chamfering edge. 34, 37 center drill and other four tools in one structure, the workpiece 5 is synchronously machined center hole 51, counterbore 52, chamfer 53 and a chamfer is cut between the counterbore 52 and the center hole 51. 54, according to this single drill tool to complete the cutting of four tools at the same time, not only can reduce the use of the tool, save the time of tool change, thereby speeding up the cutting speed and reducing the production cost, please refer to the fourth figure, then convert the tool By using a drill bit 61 to machine the perforations 55 (or blind holes of appropriate depth) along the center hole 51, the machining process of the two bolts and the bolt holes is used to effectively increase the productivity, and the design is practical and progressive.

In summary, the disposable drill bit of the present invention integrates the center drill edge, the countersunk head edge and the two chamfering edge, and the like, and the general drill bit simplifies the machining process of the bolt hole and processes The speed is faster, the production capacity is effectively increased, the production cost is reduced, and the drilling technology is more evolved. It is in line with the application requirements of the invention patent, and the application is filed according to law.

1‧‧‧Tool body

10‧‧‧Knife

20‧‧‧Tools

21‧‧‧ 刀刀座

221‧‧‧ screw holes

222‧‧‧ column hole

23‧‧‧ Positioning rod

30‧‧‧Disposable drill bits

300‧‧‧ body

31‧‧‧Fixed holes

32‧‧‧ positioning slot

33‧‧‧ Straight side

34, 37‧‧‧Chamfering blade

35‧‧‧Surface

351‧‧‧Sinking blade

36‧‧‧Center Drill

361‧‧‧cutting trough

40‧‧‧ bolt

Claims (2)

The utility model relates to a disposable drill bit, which is a flat body. The center of the body is provided with a fixing hole, and the two sides of the fixing hole are provided with semi-circular notch positioning grooves, and the sides of the discarded drill bit are set to be straight sides. The flat end of the disposable drill bit is set as a chamfering edge and is tapered inwardly. The end of the chamfering blade is connected with a countersunk blade body, and the bottom end of the countersunk blade body is provided with a countersunk blade. The end of the disposable drill bit is set as a center drill edge, and a chamfered blade connector is provided at the junction of the center drill edge and the countersunk edge. As for the disposable drill bit described in claim 1, the center drill blade is set to match the angle according to the use condition.