CN2933669Y

CN2933669Y - Drill head for manufacturing crosswise aperture

Info

Publication number: CN2933669Y
Application number: CN 200620131316
Authority: CN
Inventors: 杨贻计; 张健; 谢江盛
Original assignee: Guangxi Yuchai Machinery Co Ltd
Current assignee: Guangxi Yuchai Machinery Co Ltd
Priority date: 2006-08-18
Filing date: 2006-08-18
Publication date: 2007-08-15
Anticipated expiration: 2016-08-18

Abstract

The utility model relates to a drilling head for processing cross hole, adopting dual-edge dual-guide direct trough drilling head, which uses large top angle, wearing the working edge on the back of the drilling head large top angle into larger chamfer angle, with the height of the working edge worn to large chamfer angle with the back guide of the drill rod controlled within one millimeter. Compared with the existing technology, the utility model has the advantages of guaranteeing liner angle of the cutter, guaranteeing the precision of the drilling hole, especially the precision of the cross hole.

Description

The cross bore drill bit for machining

Technical field

The utility model relates to a kind of drill bit, specifically is used for the drill bit in machining cross hole, especially the drill bit of the higher cross bore of requirement on machining accuracy.

Background technology

Often have various cross bore in some plant equipment, at present, cross bore all is the way that adopts subdrilling, cuts with scissors, regrinds at last.But because the existence of cross bore, non-orthogonal especially cross bore exists, and when drill bit was worked into two holes and passes through part mutually, unbalance stress produced skew and vibration inevitably.Its result brings difficulty to processing on the one hand, the more important thing is assurance not due linearity and cylindricity, and the hinge of back and mill are also revised and are not come, so that production efficiency is low or cause waste product easily.

For the processing of the high cross bore of required precision, adopt at present usually following two kinds of methods: fill in the hole of processing earlier with the cast iron bar of appropriate diameter (1), and machining cross hole then is with the assurance machining accuracy; (2) give drill bit with guiding with hard metal tip.The weak point of first method is for comparatively wasting and bothering, and the weak point of the second way is to operate comparatively complexity.

Summary of the invention

At the deficiencies in the prior art, the utility model provides a kind of practical drill bit that is used to improve the cross bore precision, can improve the precision of cross bore during this drill bit machining cross hole greatly, the utility model drill bit is applicable to the processing of the cross bore of common requirement, is more suitable in the processing of the higher cross bore of required precision.

The utility model cross bore drill bit for machining structure is as follows: adopt the two guiding of twolip straight fluted drill, comprise drilling rod and apex point, wherein apex point partly adopts big drift angle, work sharpening behind the big drift angle of apex point bigger chamfering is ground the difference in height that leads behind work edge after the big chamfering and the drilling rod and will be controlled in the scope of 1mm.

Wherein the big drift angle of apex point is 135～150 degree.Chamfering extended line angle is greater than 90 degree, is generally 90～120 degree, preferred 100～110 degree.The difference in height of grinding work edge and back guiding after the big chamfering preferably is controlled in 0～1mm scope, preferentially selects 0.5-0.8mm.

The utility model drill bit partly adopts big drift angle to guarantee the linearity in hole at apex point, and the while has also been improved the durability of cutter.A mill bigger chamfering behind the big drift angle of apex point make radial load that drill bit is subjected to less than axial force, and it is long to increase work edge, reduces cutting force, the intensity and the durability of assurance drill bit outer rim point.Grind the work edge of big chamfering and control within the specific limits, further guarantee drilling accuracy with the difference in height of back guiding.Owing to adopt technique scheme, the utlity model has following beneficial effect: solved common drill bit and had the not high problem of machining accuracy that causes because of cross bore is arranged, be not only applicable to the processing of the cross bore of common requirement, and be more suitable in the processing of the high cross bore of required precision, and can guarantee positional precision, the linearity requirement of machining hole, and be not subjected to the influence of cross bore.

Description of drawings

Fig. 1 is the utility model drill bit structure sketch;

Fig. 2 the utility model machining hole concerns schematic diagram with machining hole position.

Last mark the following drawings mark:

The angle of the big drift angle of 1-apex point; The external profile diameter of the big drift angle of 2-apex point, i.e. drift angle centering size; The angle of the big chamfering of work edge behind the big drift angle of 3-apex point; 4-grinds the work edge and the back difference in height that leads after the big chamfering.

The specific embodiment

Below in conjunction with accompanying drawing the specific embodiment is illustrated:

The utility model adopts the straight-flute drill of the two guiding of twolip, and the standard straight traverse drill that straight-flute drill can directly use cutter manufacturer to provide grinds processing by the utility model structural requirement then.Preferably adopt cold straight-flute drill in the band, be convenient to the cooling of process.Grinding processing can grind at special numerically control grinder, also can grind with common manual grinding machine, grinding method be those skilled in the art technology on top of.

A kind of concrete structure of the utility model cross bore drill bit for machining is as follows: adopt the two guiding of twolip cold in band straight fluted drill.Apex point partly adopts 135～150 degree big drift angles (shown among Fig. 1 1), and big drift angle can guarantee the linearity of cutter, simultaneously also in order to improve the durability of cutter.Drill bit drift angle centering size (shown among Fig. 1 and Fig. 2 2) will be avoided cross bore as far as possible, avoids the local monolateral unsettled work of drill bit.It is the big chamfering of spending greater than 90 (shown among Fig. 1 3) that work edge behind the big drift angle of apex point grinds the extended line angle, big chamfering makes radial load that drill bit is subjected to less than axial force, and it is long to increase work edge, reduces cutting force, guarantees the intensity and the durability of drill bit outer rim point.The difference in height of grinding work edge and back guiding after the big chamfering will be controlled in the scope of 1mm (shown among Fig. 14, this size can be selected suitable numerical value according to the diameter of selected straight-flute drill), has further guaranteed drilling accuracy.

Claims

1, a kind of cross bore drill bit for machining, adopt the two guiding of twolip straight fluted drill, comprise drilling rod and apex point, it is characterized in that: described apex point partly adopts big drift angle, work edge behind the big drift angle of apex point adopts bigger chamfering, and the difference in height that leads behind the work edge of big chamfering and the drilling rod is in the scope of 0～1mm.

2, according to the described drill bit of claim 1, it is characterized in that: the big drift angle of described apex point is 135～150 degree.

3, according to the described drill bit of claim 1, it is characterized in that: described chamfering extended line angle is greater than 90 degree.

4, according to claim 1 or 3 described drill bits, it is characterized in that: described chamfering extended line angle is 90～120 degree.

5, according to claim 1 or 3 described drill bits, it is characterized in that: described chamfering extended line angle is 100～110 degree.

6, according to the described drill bit of claim 1, it is characterized in that: the work edge of described big chamfering is controlled in the 0.5-0.8mm scope with the difference in height of back guiding.

7,, it is characterized in that drill bit drift angle centering size avoids cross bore according to the described drill bit of claim 1.