CN207756972U - A kind of brill for taper hole machined expands chamfering one fluted drill - Google Patents

Abstract

The utility model provides a kind of brill expansion chamfering one fluted drill for taper hole machined, it can not only solve the problem of that efficiency existing for traditional taper hole machined is low, of high cost while can also solve existing brill and expand integrated drill bit not to be suitable for plastic material taper hole machined because of poor rigidity.It includes drill body part and the shank body part of concentric one, shank body part is a cylinder, drill body part is ladder circle cylinder, and drill body part includes drilling portion and taper reamer, and taper reamer periphery offers chip space and chip space forms knife spine in taper reamer periphery；It is linked together between drilling portion and taper reamer by the way that even mill mode is concentric, taper reamer and the junction of shank body part are equipped with chamfered section.

Description

An integrated twist drill for drilling, expanding and chamfering for tapered hole processing

technical field

The utility model relates to the technical field of metal cutting tools, in particular to an integrated twist drill for drilling, expanding and chamfering for tapered hole processing.

Background technique

The traditional taper hole processing is to drill the bottom hole first, then use the reaming tool to taper the hole, and finally use the chamfering tool to interpolate and mill the hole chamfering. This traditional processing method not only takes up many tool magazine locations, but also Low efficiency and high cost cannot meet the requirements of modern industrial efficient processing.

For the tapered hole processing of plastic materials, affected by the characteristics of the plastic material itself and the relatively long conical surface (blade) of the tapered reaming tool, when the above-mentioned traditional method is used for tapered hole processing, the cutting is thin and not easy to break chips, which will form Long curled chips, which in turn lead to heavy load on the machine tool, clogging of the cutter, burning out of the motor and other faults.

In order to solve the above-mentioned problems, a kind of drilling-expanding integrated drill combining the drill bit and the tapered reaming cutter has appeared in the field, as shown in Figure 1, which connects the drill part A and the tapered reaming part C concentrically through the neck B to form One piece, but due to the addition of a neck, the total length of the entire tool is lengthened, resulting in poor rigidity of the tool, so it can only be used in occasions where the rigidity requirements are not very high, such as aluminum alloy materials, and cannot be applied to rigidity. In the processing of taper holes in rigid components with high requirements, its scope of application is small; at the same time, due to the setting of the neck, when the drill part has drilled through the part, the neck is still in the drill hole, so when the taper reaming part cuts into the drill hole This will not only increase the load on the tool but also inevitably cause a deviation in the secondary positioning and alignment, which will affect the machining accuracy.

Utility model content

Aiming at the above problems, the utility model provides a drill, expansion and chamfering integrated twist drill for tapered hole processing, which can not only solve the problems of low efficiency and high cost in traditional tapered hole processing, but also solve the problems of existing drill holes. The integrated drill bit is not suitable for the processing of tapered holes in plastic materials due to its poor rigidity.

The technical solution is, a kind of integrated twist drill for drilling and chamfering for tapered hole processing, which includes a concentric and integrated drill body part and a shank body part, the shank body part is a cylinder, and the drill body part is A stepped cylinder, the drill body part includes a drilling part and a tapered reaming part, the outer periphery of the tapered reaming part is provided with a chip removal groove, and the chip removal groove forms a tool back on the outer periphery of the tapered reaming part, its features It is that: the drilling part and the tapered hole reaming part are concentrically connected as a whole through continuous grinding, and a chamfer is provided at the connection between the tapered hole reaming part and the shank part.

Further, a number of forced chip breakers are provided on the outer peripheral surface of the tapered reaming portion in the axial direction.

Further, the forced chip breaker is V-shaped.

Further, the groove surfaces on both sides of the V-shaped forced chipbreaker are transitionally connected in an R-shaped arc at the bottom of the groove.

Further, the groove surfaces on both sides of the V-shaped forced chipbreaker form an included angle of 90 degrees.

The beneficial effect of the utility model is that: the drilling part and the taper reaming part are concentrically connected as a whole through continuous grinding, on the one hand, the length of the entire tool is effectively reduced, the rigidity of the tool is improved, and the tool can be repaired after use. Grinding can not only prolong the service life of the tool, but also can be applied to the processing of steel parts with high rigidity requirements, and has a wide range of applications; While the drilling part drills through the part, the taper reaming part has cut into the drill hole, thus effectively avoiding the secondary positioning and alignment of the taper reaming part during reaming, so it can effectively improve the machining accuracy of the tapered hole; at the same time, the taper reaming part A chamfer is set between the handle and the shank, so a single feed can realize the one-time processing of the three process steps of drilling, taper reaming and hole chamfering, so it can greatly improve the processing efficiency and reduce the tool cost. Reduce the production cost as a whole; in addition, when the integrated twist drill of the utility model is applied to the taper hole processing of plastic materials, several forced chip breakers can forcibly cut off the long curl chips in the shape of thin sheets produced by the cutting of the taper reaming part, thereby Ensure chips can be discharged smoothly; while the forced chip removal flute has a 90-degree V-shaped angle and an R-shaped arc transition at the bottom of the flute, which can effectively prevent stress concentration and make long curly chips easier to cut and discharge.

In summary, the utility model is an integrated twist drill for drilling, expanding and chamfering taper holes, which directly combines the drilling part and the taper reaming part through continuous grinding, thereby effectively improving the rigidity of the tool and extending the length of the tool. service life, and a chamfer is set between the taper reaming part and the shank body, so that the utility model can complete the drilling, taper reaming and hole chamfering at one time, which can greatly improve the processing efficiency; at the same time, through The forced chip breaker set in the taper reaming part can effectively improve the chip breaking switch during reaming, so that it can completely solve the tapered hole processing from aluminum alloy to steel parts, and even tough materials such as low-nickel stainless steel, effectively improving the cutting tool The scope of application further reduces tool costs.

Description of drawings

Fig. 1 is the structural representation of the drill bit of existing drilling expansion;

Fig. 2 is a structural schematic diagram of an integrated twist drill for drilling, expanding and chamfering for tapered hole processing of the present invention;

Fig. 3 is a right view structural diagram of Fig. 2;

FIG. 4 is a schematic diagram of a partially enlarged structure at point I in FIG. 2 .

Reference signs: 10-drill body part, 11-drilling part, 12-taper reaming part, 13-chip flute, 14-tool back, 15-step root continuous grinding, 16-forced chip breaker, 17-R Arc transition, 20-shank part, 30-chamfering part, A-drill part, B-neck, C-taper reaming part.

Detailed ways

See Fig. 2, the present utility model is a kind of drilling and chamfering integrated twist drill for taper hole processing, and it comprises the drill body part 10 and shank body part 20 of concentric one, and shank body part 20 is a cylinder, and the drill body part 10 is a stepped cylinder, the drill body part 10 includes a drilling part 11 and a tapered reaming part 12, the outer periphery of the tapered reaming part 12 is provided with a chip removal groove 13 and the chip removal groove 13 forms a tool back 14 on the outer periphery of the tapered reaming part 12, The drilling part 11 and the taper reaming part 12 are concentrically connected as a whole by means of continuous grinding. 15 in FIG. .

See Fig. 2 and Fig. 4, there are a number of forced chip breakers 16 along the axial direction on the outer peripheral surface of the taper reaming part 12; the forced chip breakers 16 are V-shaped, and the two sides of the V-shaped forced chip breakers The surface is connected by an R-shaped arc transition 17 at the bottom of the groove, and the angle between the groove surfaces on both sides of the V-shaped forced chipbreaker 16 is 90 degrees, which can effectively prevent stress concentration and make the chips easier to forcibly break , Easy to discharge.

When using the integrated twist drill for taper hole processing of the utility model to process taper holes on plastic material products, the drilling part 11 first cuts into the workpiece to remove the allowance, and then the taper reaming part 12 directly participates in cutting , the flaky long chips produced by the cutting of the taper reaming part 12 are forcibly broken by several forced chip breakers into strip-shaped short chips, and the strip-shaped short chips are discharged along the chip discharge groove 13; the taper reaming process After it is in place, the chamfering part 30 directly chamfers the hole, thereby completing the integrated processing of drilling, reaming and chamfering of the tapered hole, which greatly improves the processing efficiency and reduces the production cost.

The specific implementation of the utility model has been described in detail above, but the content is only a preferred embodiment of the utility model creation, and cannot be considered as limiting the implementation scope of the utility model creation. All equal changes and improvements made according to the invention scope of the utility model should still belong to the scope covered by the patent of the utility model.

Claims (5)

1. A drill expanding and chamfering integrated twist drill for taper hole processing, which comprises a concentric integral drill body part (10) and a shank body part (20), and the shank body part (20) is a cylinder, The drill body part (10) is a stepped cylinder, the drill body part (10) includes a drill part (11) and a tapered reaming part (12), and the outer periphery of the tapered reaming part (12) is provided with rows of A chip flute (13) and the chip flute (13) forms a knife back (14) on the outer periphery of the tapered hole reaming portion (12), characterized in that: the drilling portion (11) and the tapered hole reaming portion (12 ) are concentrically connected together through continuous grinding, and a chamfer (30) is provided at the junction of the tapered reaming portion (12) and the handle portion (20). 2. The integrated twist drill for drilling, expanding and chamfering tapered holes according to claim 1, characterized in that: the outer peripheral surface of the tapered hole reaming part (12) is provided with a number of forced fractures in the axial direction. Chip flutes (16). 3. The integrated twist drill for machining tapered holes according to claim 2, characterized in that: the forced chip breaker (16) is V-shaped. 4. A kind of integrated twist drill for drilling, expanding and chamfering for tapered hole processing according to claim 3, characterized in that: the groove surfaces on both sides of the V-shaped forced chipbreaker (16) are at the bottom of the groove The position is R-shaped circular arc (17) transition connection. 5. A kind of integrated twist drill for drilling, expanding and chamfering for tapered hole processing according to claim 4, characterized in that: the groove surfaces on both sides of the V-shaped forced chip breaker (16) are in the shape of 90 degree included angle.