CN87207941U - Circular saw blade for hot-cutting metal - Google Patents

Abstract

The utility model relates to a high-performance circular saw blade for hot-cutting metal. The circular saw blade for hot-cutting metal is characterized in that the circular saw blade for hot-cutting metal is thin (the thickness is only 60%-65% of the thickness of an ordinary saw blade); the circular saw blade for hot-cutting metal is provided with a backlash, a declivous cutting edge and a large arc tooth back. The circular saw blade for hot-cutting metal can be made into double sharp teeth or three sharp teeth. Compared with an ordinary saw blade, the service life of the circular saw blade for hot-cutting metal is increased by three to four times, the cutting force is reduced by 20%-30%, the cutting efficiency is reduced by about 30%, and the cutting width is reduced by about 30%. Consequently, the cutting ability is improved and the metal lost is reduced. The circular saw blade for hot-cutting metal is especially suitable to be used on a large diameter saw machine (the diameter is more than 800 mm).

Description

Circular saw blade for hot-cutting metal

The profile of tooth of used fervent metal circular saw is divided into three kinds basically both at home and abroad at present: mouse tooth form, wolf's fang type and triangular form (correspondingly are called I, II, III type, as shown in Figure 1) among China professional standard ZBJ41001-85.The profile of tooth of existing saw blade is fairly simple, but has many problems.At first, when the big section metal rolled piece of cutting the saw blade side with the friction of saw kerf side-wall metallic binding, especially binding is even more serious when saw blade takes place to vibrate, generally the power loss that causes of binding accounts for 30%～60% of whole power consumption; Secondly, be that cutting edge is a straight line perpendicular to the saw blade two sides because of the sawtooth top is straight, cut a certain amount of metal rear tooth point a, b two place's blunt (see figure 2)s, cause rolled piece saw kerf place to stay burr.Be the no burr cutting of realization, U.S. Pat 4,137,808 once proposed a kind of novel saw blade, but this profile of tooth is complicated, processing difficulties.In addition, existing three kinds of flute profiles, its front flank and tooth back all are the planes, tooth root part intensity difference, especially root often cracks when sawtooth blunt and saw blade vibration, and the big teeth groove that stops up easily of smear metal causes the paste tooth in addition, and saw blade can't be cut.For improving this situation, French Patent (FRP) FR2,414,380 once proposed several novel tooth forms with bidentate point, but their rake angle is quite big, is difficult to cut metal, and the big and crown frangibility of cutting force is so application is restricted.Therefore, at the problems referred to above, the novel saw blade (Fig. 3) that the present invention's proposition has following feature.

One, saw blade two sides (A and B) side clearance is all arranged at the sawtooth position is that r, the degree of depth are the small sideshake of S, shown in Fig. 3 a, thereby avoid binding, reduce power consumption about 15%.

Two, change the sawtooth front shape, make the front flank (C) that is the plane depart from a distance of profile of tooth center line (I-I) (e), and have a negative rake angle (α), tooth back (D) to be one to have radius r ₀Cambered surface, front flank (C) and tooth back (D) are intersected and are formed the crown that the addendum angle (β) less than the right angle is arranged.The front flank (C) of tooth back (D) and adjacent teeth is that the cambered surface of r is connected with radius, and constituting the degree of depth is the teeth groove of H, sees shown in Fig. 3 b.The intensity of this tooth is higher, and combination property is best.This tooth also can make has identical serration point and gullet depth is two pointed tooths or the tritubercular profile of tooth (see figure 4) of h, can further reduce cutting force and cutting power.

Three, as can be known from Fig. 3 C, front flank (C) intersects the cutting edge that forms with tooth back (D) on saw blade thickness (δ) direction be a broken line that two oblique basils (θ and φ) arranged, tiltedly the basil (θ) is less than the oblique basil (φ), the floor projection of broken line (L) is perpendicular to two sides (A and B) of saw blade, and the oblique basil direction of adjacent two teeth is opposite, cutting edge also can be a trapezoidal broken line with oblique basil (φ ') of two symmetries, shown in Fig. 3 d, the floor projection of trapezoidal broken line (L ') is still perpendicular to two sides (A and B) of saw blade.These two kinds of cutting edges can both realize not having the burr cutting.

Four, guaranteeing that saw blade does not take place under the prerequisite of elastic instability and wooden dipper song, it is the thinnest that saw blade reduces to, its thickness (δ) only is 60%～65% of common saw blade thickness, thus, make sawing force reduce 20%～30%, sawing power reduces about 30%, and the saw blade axis runout correspondingly reduces and the saw kerf width is reduced about 30%, thereby has improved cutting ability greatly and reduced metal loss.

For example, the saw blade of diameter 1000mm, rake angle α=0 °～(15) °, tooth back cambered surface radius r ₀=16.3mm, addendum angle β=75 °, tooth fillet radius r=4mm, saw blade thickness δ=4mm～6mm, side clearance r=15 ', oblique basil θ=2 °～5 °, φ=20 °～45 °.At saw blade peripheral speed V=103m/s, under the condition of the marching speed u=235.8mm/S, sawing 53,000 ton of all kinds of steel, improve 210%～338% service life, promptly originally just will change with class of common saw blade (eight hours), existing new saw blade can use four to five classes continuously.

In sum, the present invention is a kind of dynamical fervent metal circular saw, is characterized in: thin specification, and the band sideshake, declivous cutting edge, the big curved tooth back of the body also can make two pointed tooths or three pointed tooths.Novel saw blade is particularly useful for the saw of major diameter (more than the diameter 800mm).

Claims (1)

1, a kind of fervent metal circular saw is characterized in that:

(1) side clearance is all arranged at the sawtooth position is that r, the degree of depth are the small sideshake of S in two of saw blade sides (A and B),

(2) front flank of saw blade (C) is a plane, it departs from a distance of profile of tooth center line (I-I) (e), and a less negative rake angle (α) is arranged, the tooth back (D) of saw blade is a cambered surface with radius r o, front flank (C) intersects crown that the addendum angle (β) less than the right angle is arranged of formation with tooth back (D), the front flank (C) of said tooth back (D) and adjacent teeth is that the cambered surface of r links to each other by radius, and constituting the degree of depth is the teeth groove of H

(3) can also to make be two pointed tooths or tritubercular to the crown that forms of said front flank (C) and tooth back (D), and two pointed tooths or three pointed tooths have identical serration point and gullet depth (h),

(4) intersecting the cutting edge on saw blade thickness (δ) direction that forms by said front flank (C) with tooth back (D) is a broken line with two oblique basils (θ and φ), the said oblique basil (θ) is less than the oblique basil (φ), the floor projection of said broken line (L) is perpendicular to said two sides (A and B), and the oblique basil direction of adjacent two teeth is opposite

(5) said front flank (C) can also be a trapezoidal broken line with oblique basil (φ ') of two symmetries with the crossing cutting edge that forms in tooth back (D), and the floor projection of this trapezoidal broken line (L ') is still perpendicular to said two sides (A and B).

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