CN104960046A

CN104960046A - Eccentric nail cutting auger bit

Info

Publication number: CN104960046A
Application number: CN201510455210.4A
Authority: CN
Inventors: 张华�
Original assignee: ZHEJIANG BISON TOOL CO Ltd
Current assignee: ZHEJIANG BISON TOOL CO Ltd
Priority date: 2015-07-30
Filing date: 2015-07-30
Publication date: 2015-10-07

Abstract

The invention discloses an eccentric nail cutting auger bit. The eccentric nail cutting auger bit is simple in structure, high in strength of a wood drill, small in cutting resistance and high in drilling efficiency, and an iron nail driven in wood can be cut off. The eccentric nail cutting auger bit comprises a bit body, a cutting blade is arranged at the front end of the bit body, a spiral chip groove is manufactured in the bit body, a bit handle to be clamped is manufactured at the tail end of the bit body, a conical screw tip is manufactured at the front end of the center of the bit body, the vertex angle of the cutting blade is 180 degrees, a tool orthogonal rake E at the outer edge of the cutting blade ranges from 25 degrees to 30 degrees, and a tool orthogonal clearance ranges from eight degrees to ten degrees. The eccentric nail cutting auger bit is characterized in that the distance A between an auger bit center formed by the bit handle and the conical screw tip and the outer edge of the cutting blade is larger than the reverse distance B between the auger bit center and the outer edge of the cutting blade, and an eccentric distance S exists between the midpoint between the outer edge of the cutting blade and the reverse outer edge of the cutting edge and the rotating center of the auger bit. In the drilling process, the reverse surface of the outer edge of the cutting blade cannot be in contact with a hole wall, and friction resistance is greatly reduced.

Description

Bias cuts nail Zhiluo driller

Technical field

The invention belongs to wood working tool, the bias that particularly carpenter is boring cuts nail Zhiluo driller.

Background technology

Common carpenter's auger is by main cutting edge and side cutting edge, main cutting edge mainly cuts the timber in the middle of hole, the hole wall of side cutting edge to boring cuts, and makes the hole wall in bored hole smooth, and size is unified regular, because the material of carpenter's auger institute drilling is usually more loose, quality is not hard, and therefore, their cutting edge is all sharper, forward and backward angle is comparatively large, and the angle between front and rear knife face is less.The material manufacturing carpenter's auger is also employing No. 45 steel, and the hardness after quenching is 45-48HRC.But in the use of boring, man-hour is added particularly to old timber, often go up face nailing and have iron nail, common carpenter's auger encounters iron nail, due to the intensity of blade and hardness more weak, can tipping be there is, wiredrawn edge etc. and damage the cutting edge of carpenter's auger, cause carpenter's auger cannot continue use, or boring quality and efficiency decline.Therefore, market have for cutting in timber the Zhiluo driller that cuts nail (also claiming straight sieve brill that cuts nail) that may have iron nail, this drill bit intensity is high, but bores without side cutting edge owing to cutting nail, therefore, the hole wall holed is crude, cut nail the head bored and the frictional resistance boring body and hole wall large, greatly, heating is many for consumed power, even there is the situation that hole wall burns, the quality of impact boring.

Summary of the invention

The object of this invention is to provide that a kind of structure is simple, the intensity of carpenter's auger is high, cutting resistance is little, the efficiency of boring is high, the bias can cut off nail iron nail in wood cuts nail Zhiluo driller.

In order to reach above-mentioned requirements, the present invention is achieved by the following technical solutions: it includes brill body, the front end of boring body is cutting edge, bore and be shaped with spiral chip area with it, the drillstock for clamping is shaped with at the tail end boring body, the front end at Zuan Shen center is shaped with taper spiral shell point, the drift angle of described cutting edge 180 degree, the anterior angle 30-25 degree of the anterior angle E at cutting edge outer rim place, relief angle 8-10 degree, it is characterized in that drillstock and the Zhiluo driller center that formed of taper spiral shell point are greater than the reverse distance B of Zhiluo driller center to cutting edge outer rim place to the distance A of cutting edge outer rim, there is eccentric distance S in the mid point between cutting edge outer rim and the reverse outer rim of cutting edge and the centre of gyration of Zhiluo driller.

The cut nail material C65 material of Zhiluo driller of described bias is made.

The hardness of described cutting edge is 52-60HRC.

Described eccentric distance S is A/12-A/8.

To cut nail Zhiluo driller according to the bias of such scheme manufacture, due to the existence of eccentric distance S, when holing, the reflecting surface of cutting edge outer rim can not contact with hole wall, substantially reduce frictional resistance, the situation that hole wall burns also can not occur, and the quality of boring increases.

Accompanying drawing explanation

Fig. 1 is that bias cuts nail the front view of Zhiluo driller;

Fig. 2 is the A-A profile in Fig. 1;

Fig. 3 looks up enlarged drawing in Fig. 1.

In figure: 1, bore body; 2, cutting edge; 3, chip area; 4, drillstock; 5, taper spiral shell point.

Detailed description of the invention

Below in conjunction with the drawings and specific embodiments, the invention will be further described.

Fig. 1, Fig. 2, Fig. 3 are that bias cuts nail the structural representation of Zhiluo driller.As seen from the figure, bias cut nail Zhiluo driller (also claim bias cut nail straight sieve bore) include bore body 1, the front end of boring body 1 is cutting edge 2, bore on body 1 and be shaped with spiral chip area 3, the drillstock 4 for clamping is shaped with at the tail end boring body 1, the front end of boring body 1 center is shaped with taper spiral shell point 5, and the drift angle B of described cutting edge 2 is 180 degree, and the anterior angle E at cutting edge 2 outer rim place is 30-25 degree, relief angle F is 8-10 degree.The cut nail material C65 material of Zhiluo driller of described bias is made.Wherein the hardness of cutting edge 2 is 52-60HRC.The Zhiluo driller center that its drillstock 4 and taper spiral shell point 5 are formed is greater than the reverse distance B of Zhiluo driller center to cutting edge 2 outer rim place to the distance A of cutting edge 2 outer rim, and the mid point between cutting edge outer rim and the reverse outer rim of cutting edge and the centre of gyration of Zhiluo driller exist eccentric distance S.Described eccentric distance S is A/12-A/8, and the diameter D holed equals 2A.As can be seen from Figure 3, when holing, only contact with hole wall in the position at cutting edge 2 outer rim place, remaining whole surface does not contact with hole wall, substantially reduces frictional resistance.

Claims

1. bias cuts nail Zhiluo driller, it includes brill body, the front end of boring body is cutting edge, bore and be shaped with spiral chip area with it, the drillstock for clamping is shaped with at the tail end boring body, the front end at Zuan Shen center is shaped with taper spiral shell point, the drift angle of described cutting edge 180 degree, the anterior angle 30-25 degree of the anterior angle E at cutting edge outer rim place, relief angle 8-10 degree, it is characterized in that drillstock and the Zhiluo driller center that formed of taper spiral shell point are greater than the reverse distance B of Zhiluo driller center to cutting edge outer rim place to the distance A of cutting edge outer rim, there is eccentric distance S in the mid point between cutting edge outer rim and the reverse outer rim of cutting edge and the centre of gyration of Zhiluo driller.

2. the bias according to claim l cuts nail Zhiluo driller, it is characterized in that the cut nail material C65 material of Zhiluo driller of described bias is made.

3. the bias according to claim l cuts nail Zhiluo driller, it is characterized in that the hardness of described cutting edge is 52-60HRC.

4. the bias according to claim l cuts nail Zhiluo driller, it is characterized in that described eccentric distance S is A/12-A/8.