Sawing Technology Drives the Development of Precision Machining
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Sawing Technology Drives the Development of Precision Machining

Modern manufacturing is developing in the direction of high efficiency, high precision, and economy. Band saws are the most efficient tools for the primary processing of metal and non-metal materials.
Published: Jun 06, 2022
Sawing Technology Drives the Development of Precision Machining

What is a Hacksaw?

A hacksaw is mainly used for sawing metal materials, but also for sawing small pieces of wood, plastic products, etc., and sometimes for cutting cables and wires. Common hacksaw frames are available in two types: adjustable length and fixed length, and are made of steel plates or steel pipes.

A hacksaw is a common tool for fitters, which can cut small-sized round steel, angle steel, flat steel, and workpiece. The hacksaw consists of a saw frame and a saw blade. When using the saw blade, install the saw blade on the saw frame. Generally, install the saw blade with the tip of the tooth facing forward. However, if you find that it is easier to adze the teeth during use, install the tip of the tooth in your direction. Relieves adze teeth and prolongs the service life of the saw blade. After the hacksaw is used, the saw blade should be removed or the tension nut should be loosened, which can prevent the saw frame from being deformed, thereby prolonging the service life of the saw frame. There are two types of saw blades: unilateral teeth and bilateral teeth, and there are several specifications of coarse teeth, medium teeth, and fine teeth, which are suitable for sawing different materials.

What is a Power Hacksaw?

A chainsaw is a cutting tool that uses electricity as a power to cut wood, stone, steel, etc., and has sharp teeth on the edge. Divided into fixed and portable, saw blades are generally made of steel, with round, bar, and chain types.

Types of Power Hacksaw and Their Selection Point

A power hacksaw is commonly used by lumberjacks, with teeth designed to be attached to a chain to facilitate cutting wood. It usually judges the scale suitable for the operation according to the length of the chain plate, which can be mainly divided into small, medium, and large.

  1. Small Power Hacksaw: For light work
    Products with a chain plate length of fewer than 8 inches (25cm) are small chainsaws suitable for gardening work such as trimming branches and leaves. It is usually divided into two types: plug-in type and rechargeable type, which can be freely selected according to the situation of the job site. Also, due to its small size and easy handling, it is a good entry-level option.
  2. Medium Power Hacksaw: The Most Versatile
    The length of the chain plate of the medium-sized chainsaw falls between 8 to 14 inches (25 to 40 cm). Due to the full power and the choice of power supply methods, consumers can easily find the type that matches the purpose. For example, when it is necessary to control the air volume and sound volume for gardening work, you can choose the electric model; and in the mountains and outdoor work where it is difficult to ensure the power supply, you can choose the engine model.
  3. Large Power Hacksaw: For Large Job Sites
    A large chainsaw is a model with a chain plate longer than 14 inches (40 cm). Most of them have powerful horsepower, and their power type is mainly engines, so they can cut items that are difficult for medium and small machines such as thick trees, and can greatly improve work efficiency in difficult job sites such as logging. However, the operation of large chainsaws is very difficult, and the chainsaw itself has certain dangers. Based on safety considerations, it must be operated by professionals.

Market Overview of Sawing Technology:

Precision manufacturing has become an irreversible trend in global machining. Not only do consumer electronics products have this demand, but industry, aerospace, construction, transportation, and equipment manufacturers are also moving towards more sophisticated manufacturing. On the other hand, the components and materials involved in precision machining are more diverse than in the past, such as more powerful composite materials, which not only need to achieve higher precision but also the performance and output are the items that the industry cares about. Therefore, how to meet the needs of the industry and break through this challenge, the improvement of processing technology is a key link.

With the diversification of sawing materials and the demand for high-speed sawing, the demand for tungsten carbide saw blades have also increased in recent years. Welded tungsten steel particles and grinded to form the blade. Tungsten carbide saw belts can achieve more than twice the cutting rate of ordinary saw belts and produce a smoother sawing surface. The cost is more than three times that of bimetal saw belts, but the sawing life has not increased as much as expected. The reason is that Tungsten steel has hard and brittle characteristics, so the vibration of the band saw machine during sawing will seriously affect the sawing life of the tungsten steel saw belt.

What are the Application Fields of Hacksaw?

Nowadays, to meet the requirements of high-speed sawing, the surface coating of the saw belt, the wavy band-back saw the belt, the sine wave feeding mechanism, and the intelligent feeding and monitoring technology have been successively applied to the new generation of band saw machines.

Band sawing applications include steel structures, bridges, construction, equipment manufacturing, machining, precision technology, automobile manufacturing, air transportation manufacturing, marine shipping manufacturing, petrochemical equipment, mold manufacturing, and wind power generation. A hacksaw is a sawing tool machine for metal materials such as front-end material or equipment cutting in various industries.

Recently, due to the demand for many composite materials in the aerospace and automotive industries to achieve the purpose of energy-saving and environmental protection, the demand for precision cutting of composite materials (such as honeycomb, glass fiber, and carbon fiber composite materials) is also increasing. The annual output value of the sawing machine industry can reach billions of Taiwan dollars.

Global Sawing Machine Development Trend: High Speed and Intelligence

The world's major producers of bimetal band saw blades are Europe, the United States, Japan, and Germany. At present, the bimetallic band saw blade market is mature and stable, and the growth in demand mainly comes from emerging economies such as China and India. In recent years, due to the increasing demand for high-speed and difficult-to-cut materials, the selection of cutting conditions depends on experience, and the use of improper cutting conditions will reduce the production rate and increase the wear and tear of the saw band. How optimize the selection of cutting conditions to increase the cutting rate and prolong the service life of the saw blade is the only way to reduce the cutting cost and improve the efficiency. Therefore, the development of high-speed and intelligent sawing machines is the current global development trend.

In recent years, the development of intelligent band saw machines have also become increasingly competitive. From the health diagnosis of sawing conditions to the status monitoring and troubleshooting of the machine, its development pace is like the development of the intelligent development of machine tools, but its tools face the problem is different from general processing tools. The saw belt itself has a long tool path and few support points, so the measurement of sawing conditions is difficult, and the unit price of the band saw machine is not as high as that of general tools. Therefore, how do develop an effective, cheap, and reliable tool? Diagnostic methods for the current efforts of major band sawmills.

n addition, the high-speed band sawing machine has the advantage of a high cutting rate, but the high cutting rate will increase the risk of the vibration of the saw belt during cutting, and increase the load loss of the tool. The design must be like that of the machine tool, and the structure should be simplified to achieve a higher degree of shock resistance, strengthen the effective support of the tool and the rigidity of the saw bow, monitor the uniform tooth load, and start to achieve fast and smooth cutting, increase sawing speed and stability. Due to the wide variety of materials sawn by the band saw machine, it is necessary to select the corresponding saw band for different sawing materials and sawing conditions and adjust to the appropriate sawing conditions. Traditionally, it is judged by the operator's experience whether it is a normal saw or not. However, operators without deep experience cannot know the sawing conditions and the residual life of the saw belt, so an intelligent system is urgently needed to assist. Cutting conditions, extend the life of the saw belt, high-efficiency sawing, and save labor and costs.

Protective Coating Technology is Indispensable

The sawing mechanism of the band saw machine belongs to continuous cutting, so the cutting teeth on the saw belt are closely interdependent. The research and development of a special tooth profile can make each tooth bear the cutting force on average, which is the key to achieving high efficiency and long saw belt life. The protective coating technology can reduce the sawing resistance and protect the geometry of the saw teeth. However, there are not many saw blades with protective coatings at present.

Published by Jun 06, 2022 Source :kknews, Source :hope

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