What Factors Affect Cutting Speed of the Crosscutting Machine?
During a crosscutting job, the speed of the crosscutting machine can be affected by several factors. These factors include the feed force, the workpiece alignment, and the motor speed.
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Motor speed
During the cross sawing process, the motor speed of the sawing machine plays a crucial role. It affects the cutting speed and also the cutting power. Moreover, the speed affects the energy efficiency.
The motor speed of a sawing machine is measured in Surface Feet per Minute (sfm). This is similar to miles per hour on a car. A typical machinist calculates the RPM needed to produce a proper cutting speed.
As the speed increases, the power also increases. This is because larger blades present more teeth to material in a minute. A larger blade also has a faster outside edge. Similarly, the diameter of the blade is also an important figure in the selection of the correct blade.
The most common machining condition is the feed. The power value increases almost linearly with the increase in the feed rate. A good surface finish is obtained at the lowest feed setting.
The other most significant machining condition is the cutting speed. As the feed increases, the cutting speed increases.
Feed force
Using a crosscutting machine to harvest timber is a process that requires a certain amount of fuel. The fuel consumed is a function of the diameter of the stem. The duration of the process is also influenced by the size of the tree. Detailed knowledge of the guide bar and chain movements can lead to the development of more intelligent machinery. This study aimed to estimate the relative time and fuel consumption of different cross-cutting operations. The study also evaluated the influence of machine configuration and engineering quality on the quality of the surface.
The duration of the crosscutting machine phases was assessed by comparing the video and CAN bus data. This proved to be a satisfactory way to collect accurate information. The study was conducted at two sites. Each site had a different diameter. For each site, 10 sample cross-cuts were randomly selected from the video.
The average width of the kerf was narrow for the specimen. The lowest feed rate achieved the best surface finish. Increasing the feed rate resulted in a linear increase in power. The maximum power was achieved at a cutting speed of 6.81 m x s-1. The average roughness (Ra) was 0.72 at the lowest cutting speed.
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Cutting model
Various factors contribute to the cutting speed of cross cutting machine and high speed slitting machine is increasing the speed leads to increased power, which in turn increases energy efficiency. For a cross cutting machine with a wide web, the dimensions of the cutter drum must be large enough to avoid flexure. This arrangement may be achieved by a non-uniform gearing. Other means of non-uniform gearing may include a crank drive, adjustable crank drive, or elliptical gear drive.
To eliminate the disadvantages of conventional cross cutting machines, the present invention provides a cross cutting machine with rotary cutter drums. The cross cutting machine of this invention comprises: a stable core that exerts a supporting function, and a lightweight jacket supported by the stable core. The lightweight jacket is non-uniformly rotatable. The core is driven so that it is accelerated when the jacket retards.
The cores are mounted eccentrically relative to the jackets. This arrangement minimizes the chance of oscillation. The cores also support the jacket without friction.
Workpiece alignment
Several factors influence the quality of wood surfaces: the type of wood, the machining conditions, the tool, and the machine configuration. In this paper, an experimental investigation was conducted to study the influence of these variables on chip formation.
The researchers tested the effect of cutting machine on routing across grain. Initially, they conducted an experiment with logs in the green state. They measured eight profiles for each board for assessment across grain. They found that the maximum depth of torn grain was positively related to surface roughness and waviness across the grain. The smallest cutting speeds of 3 and 62.2 m/s were not enough to detect the effect of cutting speed on cant surface quality. The results confirmed the benefits of feeding logs below the center of the cutting circle.
Next, they examined the effects of cutting speed on energy efficiency. They reported that higher cutting speeds decreased the average roughness (Ra) value, while reducing cell wall deformation. They also reported that lower cutting speeds were more energy efficient.
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