CN2078667U

CN2078667U - Deep hole drill for many kinds of steels

Info

Publication number: CN2078667U
Application number: CN 90223877
Authority: CN
Inventors: 马尚德; 马侠神
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-11-12
Filing date: 1990-11-12
Publication date: 1991-06-12

Abstract

The utility model provides a deep hole drill which is used for many kinds of steel and has wide application range. The utility model causes various steel to obtain an ideal breaking in the process of machining deep holes according to the breadth variation of breaking and the geometric angle difference of a knife edge, the utility model overcomes the limitation that a common deep hole drill needs different hard alloy in the process of machining different types of steel. Because a supporting block and a leading block of the utility model are made of different materials and an outside circular arc adopts a non drill concentric circle, namely the circular arcs of the supporting block and the leading block are less than the nominal radius of the drill, the comprehensive performance of the drill is enhanced. The utility model has the advantages of high machining smoothness, long service life, etc.

Description

The deep hole drill that is used for multiple steel

The utility model has related to a kind of metal processing cutting tool, is adapted to chip removal drill bit in the carbide alloy of (mould steel, stainless steel, carbon close the knot steel) deep hole processing on the steel grade of wide range especially.

Depth drill cutting of the prior art is because drill change is dark, and except the chip removal difficulty, drill bit is suitable for bigger limitation, the drill bit that is nominal diameter of the same race is when the different steel grade of processing, adopt the different hardness alloy blade, so processing cost is very high, general factory uses very difficult.Existing in addition depth drill is often only noted the general covering of cutting edge on the drill body, and the importing as early as possible of point of a knife, so cutting resistance is big and be difficult to obtain desirable chip breaking, thereby has placed restrictions on the working (machining) efficiency and the service life of deep hole drill.The guide pad and the rest pad that are common drill bit again generally all adopt same series hard alloy, concentric circles when its outer arc also all is drill body, so produce bigger frictional force when cutting, very high for the lubricant medium requirement, processing still can not obtain desirable fineness on different steel grades.Also having existing drill bit is that the linear velocity that overcomes bit central point in the drilling state equals zero, the general distance that all adopts the top and bit central of increasing center sword, but so often strengthened the radial load of drill bit, and can't strengthen the feed speed of drill bit, even when drill body just imports workpiece sword explosion phenomenon in limit takes place.

In order to overcome the deficiency of above-mentioned prior art, the utility model provides a kind of drill bit of deep hole processing, can be applicable to the different steel grades that have a wide reach, and improves processing fineness and service life.

The purpose of this utility model realizes by following measure: on the drill bit basis that is made of blade, rest pad, mouthful guide pad etc., adopt different in width chip-breaker a according to the disconnected cutting of difference material blade, such as 45 ^#It is the drill bit of 2.8mm that steel adopts chip-breaker width a.Adopt the different cutter of blade to go into angle and the different distance of blade incision work, reduced the radial load of drill bit.Adopt the form of cutting edge bus than the suitable incision of bit central bus, under the situation that does not change the blade angle of wedge (promptly not reducing blade strength), strengthened back angle like this, blade is under the condition of identical material, intensity increases greatly, can bear higher cutting hardness and cutting speed.Guide pad and back-up block are selected the carbide alloy of unlike material for use, help high-speed cutting.

Description of drawings of the present utility model is as follows:

Fig. 1 is a front view of the present utility model.

Fig. 2 is A among Fig. 1, B, C cross section view.

Fig. 3 is a left view of the present utility model.

The utility model will be further described below in conjunction with accompanying drawing: as shown in Figure 1 and Figure 2, because different steel grade mechanical performances are different, it is also just different to add chip breaking in man-hour situation.Chip-breaker as same width is processing 45 ^#Produce violent chip breaking during steel, be difficult to chip breaking but when the processing super-low carbon stainless steel, can become.The chip-breaker width a of A, B, C profile 2 adopts just difference according to the workpiece of different mechanical performances among Fig. 1, can obtain desirable chip breaking so need not change the material of blade carbide alloy.Processing 20 ^#During steel grade and to select the chip-breaker width for use be 3mm, 45 ^#During steel grade and to select width a for use be 2.8mm; During the 1G18Ni9Ti steel grade and to select width a for use be 2mm; During the WGMnMo steel grade and to select width a for use be 1.8mm.Adopted the different distance of different entrance angle of blade and blade incision workpiece to reduce the radial load of drill bit among Fig. 1 simultaneously.Sword 1 incision angle in center is 15 °, middle cutter 2 incision angles are 18.5 °, 13 ° of limit sword 3 incision angles, center sword 1 top and middle cutter 2 top interval 0.4mm, center sword 1 is when importing workpiece like this, guide pad 4 among Fig. 3 and rest pad 5 workpiece of all also failing to import, produced very big radial load at that time, but and the middle cutter 2 of center sword 1 top interval 0.4mm also very piece enter the incision workpiece, above-mentioned radial load has been played instantaneous balanced action, but along with the degree of depth of middle cutter 2 incision workpiece strengthens, radial load is increasing, if limit sword 3 cut too early, though can play balanced action to above-mentioned radial load, but increased the resistance of drill bit when beginning to cut also, what limit sword 3 just was chosen in that radial load just begun to increase like this cuts when rising state suddenly, makes drill bit can import workpiece smoothly, until the guide pad 4 of drill body, rest pad 5 imports the endoporus of workpiece, and in the cutting overall process, reduce vibrations, prolonged the service life of drill bit.As shown in Figure 2, adopted the cutting edge bus than the low 0.05mm of bit central bus, like this under the situation that does not change the blade angle of wedge, strengthened back angle, blade is under the condition of identical material, and intensity has increased greatly, can bear higher cutting hardness and cutting speed.Back-up block 5 and guide pad 4 adopt the carbide alloy of unlike material, and guide pad 4 adopts intensity W-Co kind YG8, YG6 alloy blade preferably, and rest pad 5 adopts higher carbide alloy W-Co-Ti kind 798 alloy blades of hardness.Adopt the combination property of the form raising drill bit of its external arc r＜1/2 bit diameter D again, also improve bit life greatly.And limit sword 3 outside cutting edges to the distance of drill body equals 1/2D (drill bit nominal diameter D)+0.05mm, has reduced radial load and moment of torsion, helps high-speed cutting.

The utility model compared with prior art has and is applicable to the different steel grades that have a wide reach, improves the advantages such as processing fineness and service life.

Claims

1. a deep hole drill that is used for multiple steel is made of blade, rest pad, guide pad etc., it is characterized in that:

A. according to its blade chip-breaker width of difference cutting material a difference, wherein cut 45 ^#Steel chip-breaker width a is 2.8mm;

B. blade center's sword incision angle is 15 °, and middle cutter incision angle is 16.5 °, and limit sword incision angle is 18 °, the top and top interval 0.4mm of middle cutter of center sword;

C. blade cut cutting edge bus is lower than cobalt head center bus 0.05mm;

D. back-up block and guide pad adopt the carbide alloy of unlike material, guide pad W-Co kind alloy wherein, rest pad W-Co-Ti kind.

2. deep hole drill according to claim 1 is characterized in that cutting 20 ^#Steel chip-breaker width a is 3mm.

3. want 1 described deep hole drill according to right, it is characterized in that cutting 1G18Ni9Ti steel chip-breaker width a is 2mm.

4. deep hole drill according to claim 1, it is characterized in that cutting WGMnMo steel chip-breaker width a is 1.8mm.

5. deep hole drill according to claim 1 is characterized in that guide pad bores class YG8, YG6 alloy blade with tungsten, rest pad W-Co-Ti kind 798 alloy blades, its external arc r＜1/2 bit diameter D.

6. deep hole drill according to claim 1 is characterized in that the sword outside, limit cutting edge to drill body central point distance is 1/2 bit diameter D+0.05mm.