Wire saw
Encyclopedia
A wire saw is a machine using a metal
wire
or cable for cutting
. There are two types of wire saw machines: continuous (or endless or loop) and oscillating (or reciprocating). Sometimes the wire itself is referred to as a "blade".
The wire can have one strand or many strands braided together. The wire saw uses abrasion
to cut. Depending on the application, diamond
material may or may not be used as an abrasive. A single-strand saw can be roughened to be abrasive, abrasive compounds can be bonded to the cable, or diamond-impregnated beads (and spacers) can be threaded on the cable. Wire saws are often cooled and lubricated
by water or oil.
industries commonly used a wire saw to cut hard stone into large blocks that can then be shipped to processing plants to be further refined. These wire saws are large machines that use diamond-impregnated beads on a cable. The saws allow the bottom of a quarry slab to be cut free (after the cable is passed through access drill holes); with the bottom cut, back and side charges (explosives) can cleanly cleave the slab.
, as compared to a blade. Another is the precision of the cut. Their main disadvantage is the slower speed. Other disadvantages include a greater chance the wire will break and any surface imperfections can cause the errors in the cut.
s and length
s, impregnated with diamond dust of various sizes to cut through materials. Because of the hardness of diamonds, this cutting technique can cut through almost any material that is softer than the diamond abrasive. DWC is also practical and less expensive than some other cutting techniques, for example, thin diamond wire only costs around 10-20 cents per foot ($0.7/m) in 2005 for 140 to 500 micrometre diameter wire, to manufacture and sells around $1.25 a foot ($4.10/m) or more, compared to solid diamond impregnated blade cutters costing thousands of dollars. Thus a 1,000 foot (300 m) spool of diamond wire costs around $200 to manufacture and sells for around $1,250. Selling cost may vary because of wire grade and demand. Other diamond wire cutting can use shaped diamond rings threaded through cables. These larger cables are used to cut concrete and other large projects.
Metal
A metal , is an element, compound, or alloy that is a good conductor of both electricity and heat. Metals are usually malleable and shiny, that is they reflect most of incident light...
wire
Wire
A wire is a single, usually cylindrical, flexible strand or rod of metal. Wires are used to bear mechanical loads and to carry electricity and telecommunications signals. Wire is commonly formed by drawing the metal through a hole in a die or draw plate. Standard sizes are determined by various...
or cable for cutting
Cutting
Cutting is the separation of a physical object, or a portion of a physical object, into two portions, through the application of an acutely directed force. An implement commonly used for cutting is the knife or in medical cases the scalpel...
. There are two types of wire saw machines: continuous (or endless or loop) and oscillating (or reciprocating). Sometimes the wire itself is referred to as a "blade".
The wire can have one strand or many strands braided together. The wire saw uses abrasion
Abrasion (mechanical)
Abrasion is the process of scuffing, scratching, wearing down, marring, or rubbing away. It can be intentionally imposed in a controlled process using an abrasive...
to cut. Depending on the application, diamond
Diamond
In mineralogy, diamond is an allotrope of carbon, where the carbon atoms are arranged in a variation of the face-centered cubic crystal structure called a diamond lattice. Diamond is less stable than graphite, but the conversion rate from diamond to graphite is negligible at ambient conditions...
material may or may not be used as an abrasive. A single-strand saw can be roughened to be abrasive, abrasive compounds can be bonded to the cable, or diamond-impregnated beads (and spacers) can be threaded on the cable. Wire saws are often cooled and lubricated
Lubricant
A lubricant is a substance introduced to reduce friction between moving surfaces. It may also have the function of transporting foreign particles and of distributing heat...
by water or oil.
Applications
- Outdoors type: The simplest type of wire saw is the inexpensive "survivalist" (emergency) type sold in hunting and climbing shops. These are intended for sawing branches.
- Construction: Continuous type wire saws are used to cut walls and other large constructions.
- Semiconductor industry: Continuous type saws are used to cut silicon wafers for the semiconductorSemiconductorA semiconductor is a material with electrical conductivity due to electron flow intermediate in magnitude between that of a conductor and an insulator. This means a conductivity roughly in the range of 103 to 10−8 siemens per centimeter...
industry. - Machine shops: Diamond-impregrated wire saws are used in machine shops to cut metal parts.
- Research and engineering: Wire saws are used in laboratories to cut fragile crystals, substrates, and other materials.
- Foam rubber: Oscillating type saws are used to cut foam rubber.
- Stained glass: Both continuous and oscillating type saws are used to cut intricate shapes in stained glass.
Stone
MiningMining
Mining is the extraction of valuable minerals or other geological materials from the earth, from an ore body, vein or seam. The term also includes the removal of soil. Materials recovered by mining include base metals, precious metals, iron, uranium, coal, diamonds, limestone, oil shale, rock...
industries commonly used a wire saw to cut hard stone into large blocks that can then be shipped to processing plants to be further refined. These wire saws are large machines that use diamond-impregnated beads on a cable. The saws allow the bottom of a quarry slab to be cut free (after the cable is passed through access drill holes); with the bottom cut, back and side charges (explosives) can cleanly cleave the slab.
Advantages and disadvantages
One major advantage of wire saws is their smaller kerfKerf
Kerf and similar can mean:* kerf, the width of a cut* Kerf, a poetry collection by Peter Sanger* Kerala E.N.T. Research Foundation , a hospital at Kollam in Kerala in India...
, as compared to a blade. Another is the precision of the cut. Their main disadvantage is the slower speed. Other disadvantages include a greater chance the wire will break and any surface imperfections can cause the errors in the cut.
Diamond wire cutting
Diamond wire cutting (DWC) is the process of using wire of various diameterDiameter
In geometry, a diameter of a circle is any straight line segment that passes through the center of the circle and whose endpoints are on the circle. The diameters are the longest chords of the circle...
s and length
Length
In geometric measurements, length most commonly refers to the longest dimension of an object.In certain contexts, the term "length" is reserved for a certain dimension of an object along which the length is measured. For example it is possible to cut a length of a wire which is shorter than wire...
s, impregnated with diamond dust of various sizes to cut through materials. Because of the hardness of diamonds, this cutting technique can cut through almost any material that is softer than the diamond abrasive. DWC is also practical and less expensive than some other cutting techniques, for example, thin diamond wire only costs around 10-20 cents per foot ($0.7/m) in 2005 for 140 to 500 micrometre diameter wire, to manufacture and sells around $1.25 a foot ($4.10/m) or more, compared to solid diamond impregnated blade cutters costing thousands of dollars. Thus a 1,000 foot (300 m) spool of diamond wire costs around $200 to manufacture and sells for around $1,250. Selling cost may vary because of wire grade and demand. Other diamond wire cutting can use shaped diamond rings threaded through cables. These larger cables are used to cut concrete and other large projects.
Advantages
DWC produces less kerf and wasted materials compared to solid blades (slurry wire may be similar). On very expensive materials, this could save hundreds or thousands of dollars of waste. Unlike slurry saws that use bare wire and contain the cutting material in the cutting fluid, DWC uses only water or some fluid to lubricate, cool the cut, and remove debris. On some materials DWC may not need water or cutting fluid, thus leaving a clean dry cut.Disadvantages
Using diamond wire for cutting does have the problem of being less robust (snapping when fatigued, bent, jammed or tangling) than solid cutting blades and possibly more dangerous because when the wire breaks it can whip. Because of the unique nature of DWC, most saws are expensive and are tailor made to handle Diamond Wire. Commercial saws that utilize solid blades can be augmentented with diamond dust blades and thus may be more economical to operate in some areas. Another problem is when the diamond wire breaks in say, the middle of a 3000 ft (914.4 m) reel leaving two 1500 ft (457.2 m) reels of wire, thus requiring up to twice the saw direction change cycles to do the same cut and wearing out the wire saw and remaining diamond wire quicker. If the diamond wire breaks more towards an end, these shorter pieces (500 ft (152.4 m) or less) of wire are practically unusable and are commonly disposed of due to the hundreds of feet required to thread the saw, leaving little wire to use for process cutting. Because the diamond abrasive is mechanically attached to the wire, the wire loses cutting effectiveness after a few cuts because most of the abrasive is worn off the wire. This means that the last cut may take much longer than the first cut making production timing less predictable. Diamond wire lasts around six cuts then either breaks in several places or is functionally worn out. The longevity greatly depends on the material cut and the number of slices per cut. Quality control of smaller diameter diamond wire is also greatly affects wire life and getting a bad batch is not unknown.Surface Quality
The surface quality in wire saw process is important for semi conductor and photo voltaic industry. The surface quality is also important in cutting stone and concrete for construction industry. Wire saw process develops surface roughness on the cut surface. The relation between process parameters ( wire speed, feed rate and wire tension)and surface roughness was analyzed in the literature (Teomete , E, 2011).External links
- http://findarticles.com/p/articles/mi_qa3983/is_200612/ai_n17196346/pg_4
- Information and Photos on Cutting with Diamond Wire
- Example of DWC by DOE
- Cutting up a WW2 U-boat using DWC
- Cutting a fire engine in half using DWC