( 1) Electric shear cutting
Electric shear cutting is currently the most common application in the production of bags a cutting method. Electric shear cutting, first of all, after laying material, a number of layers of fabric neatly laid on the cutting table (cutting bed). Cutting, hand pushing the electric cutting machine so that it runs along the traces of the marking process in the cutting bed, the use of high-speed movement of the cutting knife will be cut off the fabric.
This cutting method, the use of equipment is mainly electric cutting machine, referred to as electric shears. Electric cutting machine is divided into two types of straight edge type and round blade type.
Production is more used in the straight edge type electric shears, this electric shears cutter is straight ruler-shaped, it is driven by the motor to do vertical up and down the high-speed movement to cut the fabric. The speed of the motor has 1800, 2800, 3600r / min three. The specifications of the electric shears are distinguished by the length of the cutting knife, the commonly used cutting knife length of 13 ~ 33cm. the cutting capacity of this electric shears that the maximum cutting thickness, usually the length of the cutting knife minus 4cm, for example, the length of the cutting knife 33cm then its maximum cutting thickness of about 29cm.
Straight edge electric shears in the production of bags in a very wide range of applications, on a variety of materials, a variety of shapes (straight or curved) can be
48 comfortable cutting, cutting thickness can be from dozens of layers to hundreds of layers, so there are "universal cutting machine" called, is the main cutting equipment in the production of bags.
Round-blade type electric shears cutting knife is disc-shaped, driven by an electric motor to do high-speed rotary motion to cut the fabric. The cutting capacity of this electric shears, depending on the size of the diameter of the cutting knife, the general diameter of the knife 6 ~ 25cm, so their cutting thickness - generally not more than 10cm maximum (less than the radius of the knife). This electric shear light and flexible, especially cutting straight line shape, because it is continuous cutting, than straight edge electric shear speed, good results. But cutting curves, especially curves of greater curvature, the effect is not as good as straight edge electric shears. Round art edge electric shears cutting thickness is also smaller than the straight edge electric shears, so this electric shears suitable for cutting small quantities of products, in mass production can do auxiliary
(2) Desktop cutting
The equipment used in this cutting method is a tabletop cutting machine. Table cutting machine is the width of about 1cm band cutter mounted on a cutting table, by the motor
It is driven by an electric motor in a continuous circular motion. When cutting, the fabric is laid close to the moving ribbon cutter, and the fabric is pushed through the cutter in the required shape, and the fabric is cut into the required pieces. This cutting method is similar to the electric saw used in wood processing. With this cutting method, the width of the cutter is small and the cutter is continuously cutting the fabric, so the cutting accuracy is high, especially for cutting small pieces, more concave and convex. However, because the equipment is too large, it does not have the characteristics of light and flexible electric cutting machine. Therefore, the scope of application is small. Usually, this cutting method is operated in conjunction with the first one.
(3) Press cutting
According to the process characteristics of cutting and cutting mechanism, it can be divided into two kinds of punching and shearing. Punch with an edge (die) along the perpendicular direction with the surface of the fabric or leather, a punch to cut the fiber, so that the cutting piece once formed. Punching is characterized by regular cutting, high accuracy, short action time and high efficiency, but the cutting force required is large, the tool structure is more complex, and it is suitable for mass production. Punching requires only the cutting motion of the cutter die and no feeding motion. When cutting, the tool cuts the leather fibers continuously in segments along the direction parallel to the leather surface. Shearing is characterized by the ability to cut out complex-shaped parts, but the cutting time is long, inefficient, labor-intensive and time-consuming, suitable for small or small batch production. Shearing - generally requires two kinds of tool shearing and feeding movements. Through the analysis of the cutting process, shearing is more suitable for cutting leather materials than punching, but from the analysis of productivity and process, punching is better than shearing.
Punching machine can be used in machining to press and process metal materials into various shapes required. This processing method is applied to the bag cutting, is stamping and cutting. Using this cutting method, first of all, we have to make various cutting molds according to the shape of the sample, install the molds on the press, and use the huge pressure generated by the press to cut the fabric into the required cut pieces according to the shape of the mold. The main feature of this cutting method is that it is very accurate and can cut a number of pieces at a time, so it is suitable for parts that require high accuracy. In addition, because of the need to make a mold, the processing cost is relatively high, so it is suitable for fixed style, press cutting and cutting off pieces of leather. Products with large production volume. Products with large variations and small lot sizes are not suitable for this Cutting method.
