FR2806652A1 - PROCESS FOR MANUFACTURING A SAW BLADE AND SAW BLADE THUS PRODUCED - Google Patents

Abstract

A method of manufacturing a saw blade, in particular a thin jigsaw blade, having sufficient strength. The saw is formed by a blade (10) with a row of teeth (11) and a back (12). At least on some segments this back has a profile of rigid section produced by material reinforcements or spacers (14).

Description

State of the art

  The present invention relates to a method of manufacturing a saw blade for portable machine tools.

  The invention also relates to a saw blade.

thus carried out.

  To make precise cuts, after one year

  gle determined solid saw blades are required. However, such solid saw blades are currently produced by taking a blade of appropriate thickness or by choosing the quality

  metals. But thick saw blades are not only-

  expensive due to the higher material and labor cost but they create an excessive chip volume and the

saw progression is slow.

  Advantages of the invention The present invention aims to remedy these drawbacks and proposes to develop a method of

  manufacturing of relatively thin saw blade.

  To this end, the invention relates to a process of the type defined above, characterized in that a thin flat saw blade is transformed by machining processes, in particular without removing chips such as, for example, stamping, rolling, fluting, forging, bending and drawing, to transform the section so that the blade

  present for a minimum weight, a moment of inertia or resistance

  both in torsion and in bending, high.

  The saw blade, produced according to the method of the invention, with a relatively thin section and with a medium metal quality, makes it possible to have good bending stiffness, low vibrations and acceptable behavior.

  in oscillations. The transformation techniques thus evo-

  quées make it possible to reinforce the thickness of the material and to induce proper tensions which have a positive impact on the oscillating behavior of the blade.

saw.

  Advantageously, a saw blade produced according to the method of the invention is a flat, thin blade, with a row of teeth and a back along the row of teeth, this back being continuous or having at least per segment,

  a profile of rigid section in torsion.

  According to a preferred embodiment of the invention, the section profile corresponds to an I or double T profile advantageously formed by triangular grooves stamped in the back of the blade and which alternate by being turned 180 times in the plan, leaving spacers extending along the edges of the triangles. Thanks to the cavities produced by profiling in

  the lateral surfaces of the back of the blade, we reduce before-

  carefully the contact surface with the product to be cut and

  thus the friction resistance during sawing.

  Drawings The present invention will be described below from

  in more detail using exemplary embodiments

  shown schematically in the accompanying drawings in the-

  which: FIG. 1 is a side view of a saw blade for a portable motorized jigsaw,

  - Figure 2 is a section along line II-II of the figure

gure 1,

  - Figure 3 is a section along line III-III of the figure

  gure 1, - figure 4 and figure 5 each represent a section of a saw blade corresponding to two other examples of

realization of the invention.

  Description of the exemplary embodiments

  The saw blade shown in side view at the

  figure 1 for a jigsaw or saw of this type, portable

  tive, motor, is a saw blade 10, flat, thin, with

  a row of teeth 11 and a wide back 12, running along the ran-

  toothache; starting from the free end opposite the fixing end of the saw blade 10, the back occupies most of the length of the row of teeth 11 and has a profile of rigid section in torsion. In the embodiment of FIG. 1, the profile of the

  section is I-shaped or double T-shaped formed by cavi-

  tees or grooves 13, triangular, stamped in the back 12 of the blade. The grooves or cavities 13 which follow one another along the back 12 of the blade are each turned 180 in the plane; between the sides 131 of the triangular cavities 13, there remain spacers 14, inclined. In the two sectional views of Figures 2 and 3, we see the profile in I or double T which corresponds to the cavities 13 stamped in both sides; we also see the row of teeth 11 with

crooked teeth 111.

  The saw blade according to Figures 1 to 3 is manufactured

  than from a thin blade 10, by a process of

  known without removing chips, to put it in

  form in its section as described, to give it

  a moment of inertia or a torque resistant to torsion

  and bending. Such treatment or trans-

  1S training are stamping, laminating, making grooves or ridges, forging, bending and drawing. By transforming the section of the saw blade 10,

  the surface of the section is left unchanged.

  To obtain a moment of inertia or moment of resistance

  as important for a low weight of the saw blade 10, it is also possible to use other profile shapes for the back section 12 of the saw blade produced using the

  processes mentioned above or by other processing processes

  Also with chip removal or processing. Thus the saw blade 12 has in section according to the example of FIG. 4, a wavy profile and according to the embodiment of FIG. 5, a profile in the form of a bar with in each of the two faces, cavities 15 in

  shape of caps or grooves. As it is not

  cut here, we can also give the section profile

  a C or U profile with short U or

  core a simple T profile. If the profile of the back section 12 of the blade is continuous, there may also be interruptions of

  section profile by reinforcements or spacers.

  Such material reinforcements are, for example,

  rods 14 described in Figure 1 and which are between

the cavities 13.

Claims (6)

R E V E N D I C A T IONS   1) Method of manufacturing a saw blade for machines   nes-portable tools in particular a motor jigsaw, characterized in that a thin flat saw blade is transformed by machining processes in particular without removal of shavings such as stamping, rolling, fluting, forging ,   bending and stretching, to transform the cross-section   lesson that the blade has for a minimum weight, a moment   inertia or resistant to torsion and bending, high.   ) Method according to claim 1, characterized in that   the surface of the section remains invariable by the transforma- tion of the saw blade section.   3) Saw blade produced according to the method of any one as claims 1 or 2, characterized in that   it consists of a blade (10), flat and thin with a handrail   tooth row (11) and a back (12) along the row of teeth, this back having at least per segment a section profile   rigid obtained in particular by shaping.   4) Saw blade according to claim 3, characterized in that the rigid section profile in bending, produced continuously in the back (12) of the blade, is interrupted by   material reinforcements or spacers.    ) Saw blade according to any one of claims 3   or 4, characterized in that the section profile is an I or double T profile. 6) Saw blade according to claim 5, characterized in that the I or double T profile is formed by the triangular cavities ( 13) stamped on both sides of the back (12)   of the saw blade, these cavities being rotated one relative   port to the other alternately 180 in the plane and they remain along the sides (131) of the triangles, successive spacers (14).   7) Saw blade according to claim 3 or 4, characterized in that the section profile is a C or U-shaped profile with short U-shaped branches.   8) Saw blade according to any one of claims 3   or 4, characterized in that the section profile is a T profile.   9) Saw blade according to any one of claims 3 or 4, characterized in that   the section profile is a wavy profile.    ) Saw blade according to any one of claims 3   or 4, characterized in that the section profile is a rod-shaped profile with   cavities (15) stamped in both sides.