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Saw beads with reduced flattening behavior and a saw cord comprising such beads

A technology for sawing cords and sawing beads, which is used in manufacturing tools, stone processing tools, metal sawing equipment, etc., can solve problems such as flattening of sawing beads, and achieve the effect of constant wear rate and constant wear rate.

Inactive Publication Date: 2019-10-22
NV BEKAERT SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But even then, the saw bead starts to flatten and it happens

Method used

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  • Saw beads with reduced flattening behavior and a saw cord comprising such beads
  • Saw beads with reduced flattening behavior and a saw cord comprising such beads
  • Saw beads with reduced flattening behavior and a saw cord comprising such beads

Examples

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Embodiment Construction

[0056] Figure 1a and Figure 1b A prior art saw bead 100 is shown. The saw bead consists of a metal sleeve 102 with an abrasive layer 104 attached to the top of the metal sleeve 102 . The metal sleeve 102 has an axis of symmetry 112 and an outer sleeve diameter Dmin. Abrasive layer 104 is comprised of abrasive particles 108 held in a metal matrix 106 . The abrasive layer extends from Dmin up to Dmax, where Dmax is the radially outermost diameter. Lmax is the average working length at Dmin. In prior art beads, L(D) remains equal to this Lmax.

[0057] During use, a force "F" with a point of action at the center "C" of the bead pushes the bead into the workpiece. This force is equal to the longitudinal tension on the wire divided by the radius of curvature of the bow times the length of the bead. As long as the bead is round, there is no impediment to the bead's rotation as it interacts with the workpiece.

[0058] However, if for one reason or another the bead is tempor...

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Abstract

A recurring problem in the use of saw cords for sawing natural or man-made stone-like materials, such as marble, granite, brick, concrete and the like, is that during the use of the saw cord the beadsmay develop a flat face inhibiting the rotation of the saw cord and hence leading to a preferred wear at one side of the saw cord. As only one side of the saw cord beads is eroded away the saw cordshave to be discarded prematurely. The inventors have found that in order to overcome this flattening problem it is beneficial that the average working length, that is the average axial length of the bead that contacts the workpiece, must increase monotonically with decreasing diameter. In this way the loss in contact area between the bead and the workpiece due to the reduced diameter of the bead is compensated by an increased working length. As a result the contact pressure on the bead remains about constant throughout the useful life of the bead which is not the case for prior art beads. In prior art beads the contact pressure on the bead increases as the contact area diminishes with decreasing diameter.

Description

technical field [0001] The present invention relates to saw beads for use in saw cords. Saw cords are used to cut materials such as natural or man-made stone such as marble, granite, brick, concrete, etc. The invention also extends to saw cords using the saw beads of the invention. Background technique [0002] Saw cords are increasingly being used in saw machines for laying large blocks of natural or man-made stone. In such machines, multiple saw cord rings (sometimes as many as 50 or more) are driven by large pulleys and sunk into the stone to be sawed. The saw cord runs at high speed (120km / h). Coolant is sprayed on the saw cord for cooling and evacuating chips. In one single operation, the entire block is cut into slabs at a saw speed of about 30 cm per hour. [0003] Saw cords are made from a carrier rope (usually a steel wire rope) with saw beads threaded on the cord. The carrier rope is closed into a loop by means of joints (eg as described in Applicant's WO2016...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23D61/18B28D1/08
CPCB23D61/185B28D1/08
Inventor J·瓦尼克T·贝克兰特
Owner NV BEKAERT SA