lock forming machine, also known as reeling machine, seaming machine, undercutting machine, duct biting machine, duct reeling machine. It is a multi-functional machine type, mainly used for the biting processing of plate connection and circular duct closed connection. It can meet the different shapes of bone types manufactured by air ducts. The thickness of the processed plate is 0.5-1.5mm. All gears, shafts, and rolls of the machine are made of high-quality steel. After strict heat treatment process, the machine is durable, stable in quality, easy to install, beautiful in appearance, reasonable in mechanical principle, flexible in movement, and convenient in operation. It can satisfy users. Different requirements. The biting machine is suitable for the production of air ducts for ventilation, air conditioning, purification and other devices. According to requirements, it can be produced into various square and rectangular thin-plate air ducts. It is an indispensable mechanized equipment for various sheet metal processing and air duct production.

There are many types of lock forming machine.The biting machine is divided into a multi-function biting machine, a joint angle biting machine, an insert biting machine, a flat biting machine, and an elbow biting machine.

The structure of the biting machine is composed of three parts: the feeding part; the transmission part; the forming part.
1. The forming part mainly refers to the main machine part, and the core part is the roll. When there is too much feeding between the two pressure rollers or the extrusion between the rollers.
2. The feeding part is mainly manual feeding, using the gap between the rolls to feed.
3. In the transmission part, the main transmission system is: a motor, a triangle belt, a reducer, an open gear, and a roller. The main engine is powered by an electromagnetic speed-regulating motor, which is transmitted to the driving shaft through a belt pulley, a cylindrical gear reducer, and a rod-pin coupling.

The use of lock forming machine.
1. The thickness of the bite plate should be within the scope of the product of various specifications. If it is less than the minimum thickness, defects such as cracks and wrinkles are likely to occur when biting; if it is greater than the maximum thickness, the thickness of the plate is inversely proportional to the square of the thickness. The forming roller will be abnormally destroyed due to the increase of the bending force, and the transmission system will be overloaded and the car will be blocked.
2. The minimum length of the bite section of the plate should not be less than 300MM, otherwise the resistance of the bite is greater than the friction force of the forward feeding plate due to too little battle between the plate and the forming roller at the same time, so that the plate is between the forming rollers. Slip and accelerate the wear of the roller forming part.
3. Before use, the feed rail should be debugged strictly in accordance with the equipment's debugging requirements, and the feed rail should be adjusted to the designated size and firm. If the actual position of the feed rail is smaller than the defined position size, the bite will not be formed; if it is larger than the defined position size, because the feed is too wide, the bite size will be out of tolerance, causing the two plates to be unable to bite or Waste material; if the feed rail is tilted tightly, it is prone to misalignment of uneven width of the bite.
4. The processing ability of the biting machine is planned according to the processing of ordinary steel plates. The commonly used ordinary thin steel plates, galvanized thin steel plates and plastic composite steel plates all have excellent biting forming functions. The strength of stainless steel plate is higher than that of ordinary steel plate. Before using stainless steel plate to bite, the first step is to form it to avoid overloading the equipment, causing excessive wear or machine disorder. Because the aluminum plate has poor plasticity, it is easy to crack when the bite is formed. Forming experiments must be done before construction. At the same time, because the aluminum plate lacks elasticity, the aluminum plate air duct cannot be snapped.
5. The adjustment of the radial reserved gap between the upper and lower forming rollers requires not only compliance with tightness, but also the same front and back. If the reserved gap is too small, it is difficult to feed the material, even after forced feeding, the bite will be cracked and tense; if the reserved gap is too large, the bite shape will be irregular or the sheet will slip between the forming rollers. When using stainless steel or aluminum plates to bite, the radial reserved gap should be adjusted larger than the gap required by steel plates of the same thickness, otherwise it will cause signs of equipment overload or bite cracking.

The processing capacity of the biting machine is designed for processing ordinary steel plates. The commonly used ordinary thin steel plates, galvanized thin steel plates and plastic composite steel plates all have good bite forming properties. The strength of the stainless steel plate is higher than that of the ordinary steel plate. Before using the stainless steel plate to bite, the forming experiment must be done first to avoid overloading the equipment, causing excessive wear or mechanical accidents. Due to the poor plasticity of the aluminum plate, it is easy to crack when the bite is formed, and the forming test must be performed before construction. At the same time, because the aluminum plate lacks elasticity, the aluminum plate air duct cannot be snap-type bite.
Before the biting machine is used, the feed rail should be debugged in strict accordance with the equipment's debugging requirements, and the feed rail should be adjusted to the specified position and size and then fixed. If the actual position of the feed rail is less than the specified size, the bite will not be formed; if it is greater than the specified size, the bite size will be out of tolerance due to the feed being too wide, causing the two plates to be unable to bite or waste material ; If the feed rail is skewed severely, it is easy to cause deviation defects with uneven width of the bite.
The thickness of the bite plate of the biting machine should be within the specified range of various specifications. If it is less than the minimum thickness, it is easy to cause defects such as cracks and wrinkles when biting; if it is greater than the maximum thickness, the thickness of the plate is proportional to the square of the thickness of the plate. The significant increase in bending force may cause abnormal damage to the forming roller, overload of the transmission system, and failure of the car.

Lock forming machine is a necessary equipment for HVAC air duct manufacturing. Multi-function lock forming machine can form 6 shapes (7-function is available) to finish sheet jointing. Six shapes include Pittsburgh(Female), Right angle(Male), Standing seam, C shape locking pin, Curving angle and Z shape. What’s more, we can customize S shape and snap lock for sheet locking. The standard machine can make 0.5-1.5 mm thickness galvanized sheet. The lock forming machine usually has two model, one's max thickness is 1.2 mm, another's max thickness is 1.5 mm. Our company specially introduce high-strength rolling reel made of GCR 15 steel which can prolong the machine life by more than 5 times and greatly heighten the efficiency. The lock forming machine can be divided into two types according to duct shape. One type is square duct lock forming machine, for example, 6-function lock forming machine. Second is round duct lock forming machine, for example, longitudinal seam connection lock forming machine. The square duct lock forming machine is a part of rectangular ventilation air tube forming machines, it can be used with other rectangular HVAC duct forming machines together to achieve a whole duct production, such as TDF flange forming machine, pneumatic TDF sheet metal folding machine, grooving machine, electric cutting machine, square duct lock seam closing machine, clips cutting machine, etc. The round duct lock forming machine can be used with the electric rolling machine, round duct lock seam closing machine, bead roller and so on. BLKMA company has both CNC duct production line which can make air duct automatically and separate machines which are easier to move. You can contact us at any time via email, mob, WhatsApp, Skype, facebook, youtube and WeChat if you have any question about HVAC duct manufacturing machines. We will reply you and help you to solve all problems as soon as possible. About after-sales service, we have professional technicians who can teach you how to operate machines by video and we can also provide engineer overseas service or you can send your workers to our factory in China to learn operation method.