Oil cylinder

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Cold drawing machine

The precision hydraulic cold drawing machine first inserts a core rod into the inner hole of the pipe when drawing steel pipes. Then, the core body is placed, and the front end of the steel pipe that has been threaded onto the core is pushed out of the extraction block. The pre-tightening oil cylinder is activated to clamp the steel pipe, and the vehicle is pulled to the starting position. The main oil cylinder begins to draw out. At the same time, the gas cylinder is pulled out, the end of the steel pipe is released, and the finished pipe is pulled out from the valve body. The slider moves in the opposite direction, allowing the plug to be quickly extracted from the pipe, facilitating smooth punching. When drawing steel pipes with the cold drawing machine, the core rod is first placed inside the pipe's inner hole, then the core rod head is installed, and the front end of the steel pipe that has been placed on the core rod head is pushed out to the drawing die seat. The pre-tightening cylinder is activated to clamp the steel pipe, and the traction vehicle is in the starting position, while the main cylinder begins to pull. At the end of the drawing process, the pre-tightening cylinder moves, releasing the steel pipe fork, and the finished pipe is pushed out of the vehicle body. The slider moves in the opposite direction, allowing the plug to quickly exit the pipe, ensuring smooth unloading. In the 1990s, with the continuous in-depth research and application of cold drawn steel pipe technology in China, cold drawn steel pipe technology has been widely applied in the manufacturing of hydraulic cylinders and oil cylinders for engineering machinery. The cold drawing machine is the main processing equipment for cold drawn steel pipes, used for cold drawing of black and non-ferrous metal bars at room temperature, as well as secondary processing of waste steel pipes after hot rolling and extrusion. It is used to produce small diameter pipes and is a major processing equipment for precision, thin-walled, and high mechanical performance pipes.

Piston rod

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Hydraulic Press

The precision piston rod undergoes rolling processing to enhance its surface corrosion resistance, delay the occurrence or propagation of fatigue cracks, and thus improve the fatigue strength of the cylinder rod. Through rolling, a layer of cold-worked hardened layer is formed on the rolling surface, which reduces the elastic and plastic deformation of the grinding contact surface, thereby enhancing the wear resistance of the cylinder rod surface and preventing burns caused by grinding. After rolling, the reduction in surface roughness can improve the matching performance. At the same time, when the piston rod moves, the friction damage to the sealing ring or seal is reduced, thereby extending the overall service life of the oil cylinder. Rolling technology is an efficient and high-quality technical means. The processing technology of the piston rod is also an important component of the piston rod. The processing technology directly affects the quality and service life of the piston rod. Rolling processing is generally used for the processing of piston rods because this method can enhance the surface corrosion resistance of the piston rod, delay the occurrence and propagation of fatigue cracks, and thus improve the fatigue strength of the piston rod.

Rolling machine

The precision hydraulic cold drawing machine first inserts a core rod into the inner hole of the pipe when drawing steel pipes. Then, the core body is placed, and the front end of the steel pipe that has been threaded onto the core is pushed out of the extraction block. The pre-tightening oil cylinder is started to clamp the steel pipe, and the vehicle is pulled to the starting position. The main oil cylinder begins to draw out. At the same time, the gas cylinder is pulled out, the end of the steel pipe is released, and the finished pipe is pulled out from the valve body. The slider moves in the opposite direction, allowing the plug to be quickly extracted from the pipe, facilitating smooth punching. When using the cold drawing machine to draw steel pipes, the core rod is first placed into the inner hole of the pipe, then the core rod head is installed, and the front end of the steel pipe that has been placed on the core rod head is pushed out to the drawing die seat. The pre-tightening cylinder is started, clamping the steel pipe with the plate teeth, and the traction vehicle is in the starting position, while the main cylinder begins to pull. At the end of the drawing process, the pre-tightening cylinder moves, releasing the steel pipe fork from the plate teeth, pushing the finished pipe out of the vehicle body, and the slider moves in the opposite direction, allowing the plug to quickly exit the pipe, ensuring smooth discharge. In the 1990s, with the continuous in-depth research and application of cold drawn steel pipe technology in China, cold drawn steel pipe technology has been widely applied in the manufacturing of hydraulic cylinders and oil cylinders for engineering machinery. The cold drawing machine is the main processing equipment for cold drawn steel pipes, used for the cold drawing of black and non-ferrous metal bars at room temperature, as well as the secondary processing of waste steel pipes after hot rolling and extrusion. It is used to produce small diameter pipes, serving as the main processing equipment for precision, thin-walled, and high mechanical performance pipes.

Cylinder

The piston rod is the most important part of the cylinder. It is usually made of high carbon steel, with a hard chrome plating on the surface, or stainless steel to prevent corrosion and improve the wear resistance of the sealing ring. When the cylinder operates, it relies on the oil mist in the compressed air to lubricate the piston. There is also a small portion of lubricating oil in the cylinder. The cylinder is a cylindrical metal part that guides the piston in a linear reciprocating motion within the cylinder. Air is expanded in the engine cylinder to convert thermal energy into mechanical energy; gas is compressed by the piston in the compressor cylinder to increase pressure. The casing of turbines, rotary piston engines, etc., is commonly referred to as the "cylinder." Applications of rollers include printing (tension control), semiconductors (spot welding machines, chip grinding), automation control, robotics, etc. In pneumatic transmission, the pressure of compressed gas can be converted into mechanical energy by pneumatic actuators. There are two types of cylinders: reciprocating linear motion and reciprocating swinging. When the cylinder and the cylinder body are cast as a single piece, it is called a monolithic cylinder. When the cylinder and the cylinder body are cast separately, the single cylinder is referred to as a cylinder sleeve. A cylinder sleeve that directly contacts cooling water is called a wet cylinder sleeve, while one that does not directly contact cooling water is called a dry cylinder sleeve.

Cylinder

Unlike non-standard oil cylinders, a cylinder is a track for piston movement. Gas burns and expands within it. Some residual heat from the gas can be dissipated through the cylinder wall to maintain the operating temperature of the engine. The types of cylinders are integrated and single-cast. Single castings are divided into dry and wet types. The piston rod is the most important load-bearing component in the cylinder. High carbon steel, hard chrome plating, or stainless steel is typically used to prevent corrosion and enhance the wear resistance of the sealing rings. When the cylinder operates, it must be lubricated with an oil mist from compressed air. There are also a small number of non-lubricated cylinders. The sealing of rotating or reciprocating parts of the cylinder is called dynamic sealing, while the sealing of static parts is called static sealing. The connection methods between the cylinder barrel and the end cap are as follows: integral, riveted, threaded, flanged, and tie rod. In addition to the static loads such as the pressure difference inside and outside the cylinder and the weight of various components, the cylinder also bears the reaction force from steam flowing out of the static blades and the forces exerted on the cylinder by various connecting pipes under hot and cold conditions. Under the influence of these forces, the cylinder is prone to plastic deformation and leakage.

Cylinder

Unlike non-standard oil cylinders, when the cylinder and cylinder body are cast as a whole, they are referred to as a monolithic cylinder. When the cylinder and cylinder body are cast separately, a single cylinder is called a cylinder sleeve. The cylinder sleeve is in direct contact with the cooling water, known as a wet cylinder sleeve, while a dry cylinder sleeve does not come into direct contact with the cooling water. To maintain a tight contact between the cylinder and the piston and to reduce friction loss during the piston’s movement, the inner wall of the cylinder should have high machining precision and accurate dimensional shape. The piston is the pressurized component within the cylinder. To prevent the left and right chambers of the piston from intermingling, a piston sealing ring is provided. The wear-resistant ring on the piston can improve the cylinder's directionality, reduce wear on the piston sealing ring, and lower friction resistance. The wear-resistant ring is made from polyurethane, polytetrafluoroethylene, and fabric-reinforced resin. The width of the piston is determined by the size of the sealing ring and the required length of the sliding components. If the sliding components are too short, it can lead to premature wear and jamming. Pistons are typically made from aluminum alloy and cast iron, while pistons for small cylinders are made from brass.

Cylinder

Unlike non-standard oil cylinders, cylindrical metal components guide the piston in a straight reciprocating motion within the cylinder. Air is converted into mechanical energy through expansion within the engine cylinder, and gas is compressed by the piston in the compressor cylinder, thereby increasing pressure. The cavity of the piston is placed on the cylinder block of the internal combustion engine. SMC and CM2 cylinder pistons use a combination sealing ring to achieve bidirectional sealing, and the piston is connected to the piston rod by press riveting, eliminating the need for nuts. The cylinder end cap is equipped with intake and exhaust ports, and some end caps also have a buffering mechanism. The rod side end cap is fitted with a sealing ring and a dust seal to prevent air leakage from the piston rod and to keep dust from entering the cylinder from the outside. A guide sleeve is installed on the piston rod side cover to improve the guiding accuracy of the cylinder, allowing the piston rod to bear a small amount of lateral load, reducing downward bending when the piston rod is extended, and extending the service life of the cylinder. The guide sleeve is usually made of sintered oil-containing alloys and forward-leaning copper castings. In the past, ductile cast iron was commonly used for end caps. To reduce weight and prevent rust, aluminum alloy die-castings are often used, while miniature cylinders are made of brass.

Cylinder

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Cylinder

Unlike non-standard oil cylinders, the end cover is equipped with intake and exhaust ports, and a buffering mechanism is installed on the end cover. The sealing ring and dust-proof ring are placed on the side cover of the rod to prevent air leakage from the piston rod and to keep external dust from entering the cylinder. A guiding sleeve is installed on the side end cover of the rod to improve the guiding accuracy of the cylinder, allowing the piston rod to bear a small amount of lateral load, reducing the bending of the piston rod, and extending the service life of the cylinder. The cylinder body of the internal combustion engine has a cavity for the piston. This is the trajectory of the piston movement, where gas burns and expands. The cylinder wall can also dissipate some of the explosive waste heat from the gas, keeping the engine at a normal operating temperature. The cylinder types include integral casting and single-piece casting. Single-piece casting can be divided into dry type and wet type. When the cylinder and cylinder body are cast as a whole, it is called an integral cylinder. When the cylinder and cylinder body are cast separately, the single cylinder is referred to as a cylinder sleeve. The cylinder sleeve that directly contacts the cooling water is called a wet cylinder sleeve, while the one that does not directly contact the cooling water is called a dry cylinder sleeve. To maintain the tightness of the contact between the cylinder and piston, and to reduce the friction loss during piston movement, the inner wall of the cylinder should have high machining precision and accurate shape dimensions.

Cold drawn pipe

With mighty technical support, powerful design and development ability