CN208976918U - A kind of drill bit for processing aluminium and aluminium alloy - Google Patents

Abstract

The drill bit of a kind of processing aluminium of the utility model and aluminium alloy, belongs to drill bit capable of machining hole technical field, solves the problems, such as that the easy breaking of extraordinary aluminium product, difficult chip removal generate product and cut tumor.This kind of drill bit, for a kind of Ni Zhifu drill drill bit, including the high h of drill bit (chisel edge) point, inner edge sharp angle, the length of outside to cutting edge, outside angle, chisel edge width, the series of parameters of relief angle arc length improves, it effectively solves the problems, such as to generate built-up edge, hole ovality in process, reconditioning is simple and practical in structure.

Description

A kind of drill bit for processing aluminium and aluminium alloy

Technical field

The utility model belongs to drill bit capable of machining hole technical field, is related to being a kind of high-strength aluminum alloy drilling processing Ni Zhifu drill Drill bit.

Background technique

Hole machined is in field of machining using very universal.Common hole machined technology is very mature, but for cutter Use be based primarily upon at present nineteen fifty-three Ni Zhifu team design Ni Zhifu drill technology.As technology constantly upgrades, optimizes, outside vehicle Structure and body part material improvement, aluminum and aluminum alloy board material is gradually to high intensity, high rigidity, high quality development.However for It processes for the cutter of aluminium and aluminium alloy, but without very high improvement and raising.Currently, along with cutter it is improved lag and The decline of employee skill level, processes Al and Al-alloy, and drilling breaking rate improves year by year.Blade drill bit is improved currently on the market It is more, but conventional tool is not improved too much, whole hard alloy cutter head structure still mainly uses setting for Ni Zhifu team Count structure.It is poor that cutter is rigidly weak, row cuts poor performance, circularity and cylindricity, is easy to produce to accumulate in process and cuts tumor, causes to cut Cut that efficiency is limited, processing quality is low.When processing super more five times of draw ratio or more such deep holes, rigidity is obvious insufficient, difficult processing Degree is big, and breaking rate is high, and such hole machined problem not can effectively solve always, becomes the bottleneck in production process.

Utility model content

The purpose of the utility model is to provide a kind of processing aluminium and the drill bits of aluminium alloy, are a kind of Ni Zhifu drill drill bit, solve special The easy breaking of kind aluminium product, difficult chip removal lead to the problem of product and cut tumor.Also solve the cutting effect of new material high intensity aluminium and aluminium alloy The problem that rate is limited, processing quality is low.

The technical solution of the utility model is: a kind of drill bit for processing aluminium and aluminium alloy is a kind of Ni Zhifu drill drill bit, feature It is, the high h=2.02mm of drill bit, inner edge sharp angle are 90 °；There is facet, the facet mistake at the close outside of major flank The angle of outside, the facet and chip plane is 3 degree, and the facet and major flank have a common boundary, between the boundary and outside away from From for 2.7mm-2.9mm；Crescent, which connects, has a concave surface circular arc at major flank, the arc length of concave surface circular arc is not less than 13mm；When bit diameter be 10*k (mm) when, a length of (3.09-3.11) the * K (mm) of outside, i.e. outside front end to cutting edge most The radial distance of outer end is (3.09-3.11) * K (mm).

Preferably, the radial distance of a length of 3.09mm-3.11mm of outside, i.e. outside front end to cutting edge outermost end is 3.09mm-3.11mm。

Preferably, bit diameter 10mm, arc length 13mm-13.25mm.

Preferably, arc length 13mm-13.25mm.

Preferably, the bit diameter is 10mm.

The technical effect of the utility model is:

It effectively solves the problems, such as to generate built-up edge, hole ovality in process.Reconditioning is simple and practical in structure, when in use It is required that described multiple functional.

Since the drill bit has carried out apex point inner edge sharp angle, outside length, special angle and width on the basis of Ni Zhifu drill The modification of outside plane, relief angle circular arc guarantees the circularity in the hole of processing and cylindricity so that centering is steady in process It is good, improve the arc length of relief angle, increases the effect of the cooling cutter of coolant liquid and the effect of chip removal, reduce the production that product cuts tumor It is raw.

The structure keeps generation stress at the tool in cutting sword smaller, for relatively former cutter structure, knife edge part shearing It is transmitted to structure of the cutter body, whole stress can reduce breaking probability when cutter uses.Also improve the service life that cutter uses.Afterwards The circular arc at angle is elongated, increases the space of cutter and machined surface, allows in processing that play the role of coolant liquid good, guarantees Drainage flow direction and cooling length, can be smoothly discharged with chip and do not injure machined surface.

Calculated by actual use, processes 15mm model alloy aluminium plate, process 230 hole conventional drill breakings 32 Average one processes 7 holes drill bit, and roughness about 12.5 in hole needs twice of processing to reach drawing requirement.Use this patent The target drill of content, the hole of same plate and specification process 230 holes and have only used 3 knife, and no breaking shows, only using 3 Because tool wear not can guarantee roughness requirements.Therefore, the target drill of the utility model greatly mentions in actual production High cutter life, reduce production cost.

Super more five times of draw ratio or more such deep holes can be processed, breaking rate is reduced.

Detailed description of the invention

Fig. 1 is the overall structure diagram of the utility model.

Fig. 2 is traditional Ni Zhifu drill front view.

Fig. 3 is traditional Ni Zhifu drill top view.

Specific embodiment

A kind of drill bit of processing aluminium and aluminium alloy of the utility model, belongs to Ni Zhifu drill drill bit, by largely practicing warp It tests to including the high h of drill bit (chisel edge) point, inner edge sharp angle, the length of outside to cutting edge, outside angle, chisel edge width, relief angle circle The series of parameters of arc length improves, and obtains parameters described below and is able to solve problems of the prior art.

The high h=2.02mm of drill bit (chisel edge) point, inner edge sharp angle are 90 °.

Increase outside facet, facet angles 3, the width 2.7mm-2.9mm of facet；

Facet is processed at the close outside of major flank, which crosses outside, and the facet and chip plane are (horizontal Face) angle be 3 degree, the facet and major flank have a common boundary, (boundary and outside less parallel) have a common boundary between outside away from From for 2.7mm-2.9mm.

(processing) grinds a concave surface at crescent connection major flank, and the arc length of concave surface circular arc (rear chamfering) is not less than 13mm.When bit diameter is 10mm, arc length 13mm-13.25mm.

When bit diameter is 10mm, the long l of outside is 3.09mm-3.11mm, i.e. outside front end to cutting edge outermost end Radial distance be 3.09mm-3.11mm.

When bit diameter is 10*k (mm), the long l of outside is (3.09-3.11) * K (mm).

For above-mentioned preferred embodiment, diameter 10mm can choose the drill bit of major diameter, the long proportionally corresponding increasing of outside Add.

The high h=2.02mm of chisel edge point, inner edge sharp angle (2 φ) are 90 degree, can make to play preferably in apex point contact working hour Certralizing ability.Chisel edge point height is difference in height between the endpoint of chisel edge and the highest endpoint of outside, and the increase of the difference in height is being processed The space of chip removal is increased in the process.Chisel edge point a height of 0.4 originally, in process, point of a knife processes plane contact, does not have Chip space influences to process: aluminium alloy work in-process heat generates product and cuts tumor, influences the roughness of product processing, rolls over cutter It is disconnected.

Inner edge sharp angle is changed to 90 degree and the high h=2.02mm of chisel edge point to combine, is easy centering.The inner edge of drill bit originally 100 degree of sharp angle, angle is excessive, it is not easy to feel relieved；Inner edge sharp angle is changed to 90 degree, point of a knife is sharp, and it is steady, fixed that when contact plane enters knife The heart is good.

Outside length l is 3.09mm-3.11mm, and increases outside facet, 3 degree of facet angles, the width of facet 2.7mm-2.9mm to be spent, can make to generate chip breaking when processing the workpiece, chip breaking is generated when processing can be improved workpiece surface roughness, And whole bits are easy to scratch workpieces processing surface, when processing counterbore, it is flat that the outside on both sides also acts as ream.It is existing in drilling The guarantee of Ni Zhifu drill circularity is poor, and the utility model increases outside facet, and 3 degree of facet angles, the width of facet increases in this way Outside area and angle, are positioned with apex point, and both sides chisel edge draws circle, and circularity, the cylindricity in this way processing workpiece hole are close Ideal factor.

Drill bit tool is there are two symmetrical outside, and hole circularity and cylindricity wants when the high increase of drill bit meets processing It asks.

It can be with by a large amount of verification experimental verification it is found that 90 ° of drill bit inner edge sharp angle and when to increase facet be 3 degree, when use Control product quality.

The arc length 13mm-13.25mm of relief angle, circular arc is elongated, increases the space of cutter and machined surface, makes in processing Coolant liquid can be made to play the role of good, ensure that drainage flow direction and cooling length, can be smoothly discharged with chip and not injured Machined surface.

The inner edge sharp angle of the drill bit improves, and increases facet, and the cooperation of arc size guarantees in 0 °~360 ° ranges Interior rotation is flexible.

Claims (6)

1. a kind of drill bit for processing aluminium and aluminium alloy is a kind of Ni Zhifu drill drill bit, which is characterized in that the high h=2.02mm of drill bit, interior Knife edge angle is 90 °；

There is facet, which crosses outside, and the angle of the facet and chip plane is 3 at the close outside of major flank Degree, the facet and major flank have a common boundary, and the distance between the boundary and outside are 2.7mm-2.9mm；

Crescent, which connects, has a concave surface circular arc at major flank, the arc length of concave surface circular arc is not less than 13mm；

When bit diameter is 10*k (mm), a length of (3.09-3.11) the * K (mm) of outside, i.e. outside front end is outermost to cutting edge The radial distance at end is (3.09-3.11) * K (mm).

2. a kind of drill bit for processing aluminium and aluminium alloy according to claim 1, which is characterized in that a length of 3.09mm- of outside The radial distance of 3.11mm, i.e. outside front end to cutting edge outermost end is 3.09mm-3.11mm.

3. a kind of drill bit for processing aluminium and aluminium alloy according to claim 1, which is characterized in that bit diameter 10mm, Arc length is 13mm-13.25mm.

4. a kind of drill bit for processing aluminium and aluminium alloy according to claim 1, which is characterized in that arc length 13mm- 13.25mm。

5. a kind of drill bit for processing aluminium and aluminium alloy according to claim 1, which is characterized in that the bit diameter is 10mm。

6. a kind of drill bit for processing aluminium and aluminium alloy according to claim 1, which is characterized in that crescent connects major flank The concave surface circular arc at place, processing method are to grind.