What are three-jaw chucks: Three-jaw chucks are divided into hydraulic chucks, manual chucks, pneumatic chucks, vertical chucks, built-in integrated chucks (cylinder and chuck integrated), electric chucks, mechanical chucks, etc. Among them, the three-jaw hydraulic chuck needs to be used with oil cylinders of the same size. It is easy to install, fast and safe to clamp, and is suitable for processing large quantities of regular parts. Manual chucks are divided into ordinary manual chucks and powerful manual chucks. Ordinary manual chucks are equipped with hard claws and are divided into front and reverse claws. They are suitable for rough processing of irregular-shaped and regular parts. The powerful manual chuck is equipped with hard claws, and optional soft claws are available. The hard claws are used the same as ordinary manual chucks, while the soft claws can directly process parts into finished products. More versatile. Pneumatic chucks are high-precision chucks that generally process large quantities of workpieces with low hardness, stable clamping force and high precision. Vertical chucks require special equipment. Generally processing irregular work with larger specifications Read More »

Inspecting the hollow double-piston cylinder is mainly to detect its degree of wear, that is, the roundness and cylindricity of the cylinder. 1. Measurement of the cylinder bore of the cylinder block ① The measurement part of the hollow double-piston cylinder bore is based on the wear pattern of the cylinder. When measuring the cylinder diameter, measurements should be made in the three axial sections and directions of the cylinder. The upper section is in the upper part of the cylinder, which is equivalent to the position of the piston ring when the top dead center of the piston stroke is about 15mm; it is far away from the top of the cylinder; the second section is in the middle of the cylinder, about 35mm from the top of the cylinder; the third section is in the lower part of the cylinder, close to the lower edge, and about 70mm from the top of the cylinder. ② Adjust the measuring cylinder gauge, measure the length of the connecting rod, select the appropriate measuring connecting rod and fixing nut according to the diameter of the cylinder to be measured, and screw into the lower end of the measuring rod. Adjust the length of the connecting rod so that the total length of the connecting rod and the movable measuring rod adapts to the diameter of the cylinder being measured, even though the measurement range can include the larger and smaller wear diameters of the cylinder. ③ Measure the diameter of the hollow double-piston cylinder with small wear Read More »

A collet is a locking device that clamps workpieces and is commonly used on drilling and milling machines and machining centers. The following is the installation method of the collet chuck shared by the editor. First, the installation steps of the collet chuck 1. Check whether the thread of the connecting nut can be locked into the connecting pipe. 2. Tighten the coupling nut onto the sleeve. 3. Reduce the oil pressure to the lowest level and drive the hydraulic cylinder to stop the piston at the front end. Rotate the chuck to lock the connecting nut into the threads of the connecting pipe. When locking, the taper hole of the chuck must be concentric with the taper of the spindle, and the alignment hole of the chuck must be aligned with the alignment button on the nose of the spindle. 4. Operate the hydraulic cylinder to move the piston backward, combine the taper of the chuck with the spindle, and confirm that the centering button is installed in the chuck. 5. Fix the chuck and the spindle with the locking screw, gradually increase the oil pressure, and repeatedly drive the chuck to the maximum allowable thrust. Then there are the steps to install the collet chuck: 1. Remove the limit cover, 2. Read More »

The pressure plate clamp is a type of fixture that uses a pressure plate to press the upper and lower workpieces together to create indentations on the workpieces. The pressure plate clamp can exert a clamping force on the workpiece, so that the clamped workpiece obtains a certain tightening force, so that the processed surface and the pressure plate closely match, so that the workpiece surface and the positioning element fit accurately and closely, so as to achieve the purpose of correctly positioning the workpiece. Pressure plate clamp is a device used to clamp workpieces. According to the clamping force required by the workpiece, it can be divided into three categories. One type is the commonly used ordinary pressure plate, which is used to clamp general workpieces. The pressure plate clamp is a type of fixture that uses a pressure plate to press the upper and lower workpieces together to create indentations on the workpieces. The pressure plate clamp can apply clamping force to the workpiece, so that the clamped workpiece obtains a certain tightening force, so that the processed surface closely matches the pressure plate. Features of pressure plate clamps: 1) reliable clamping, stable clamping force, the size and direction of the clamping force can be adjusted; 2) the clamping components will not be damaged due to excessive pressure Read More »

During the operation of the pressure plate clamp, we first clearly understand the scope and content of the work we have to do. Today I will summarize the fixtures that we often use in use. 1. Summary of universal pressure plate clamps 1. Chuck, Chuck can be said to be familiar with our robots, rather than familiar fixtures. Chuck is a hundred years old. This is a classic fixture. 2. Vise, wort. If the platen is unable to hold the workpiece, consider using a vise or grain clamp. 3. Magnetic platform. Magnetic platforms are easy to use, but relatively expensive. 4. Spindle and tool holder. The crystallization of human wisdom and technology. 5. Spring sleeve/bushing, through which and the tool holder, tools of different specifications can be clamped. 6. Cylinder clamp is the essence of automatic fixture. 7. Dividing head. It used to be beautiful. It gradually declined with the advent of indexing spindles. 2. Classification of pressure plate clamps 1. Classification of machine tool clamps (1) Classification by professional level 1) General purpose clamps Read More »

The field of CNC machine tool processing is no stranger to fixtures. CNC machine tool processing requires the assistance and stability of fixtures to ensure the accuracy of processed parts, reduce labor intensity, and improve production efficiency. There are many types of machine tools, and different machine tools are used to process different workpieces. Next, I will introduce to you the specific functions of the pressure plate clamp, as well as commonly used clamps. 1. What are the functions of the pressure plate clamp? 1. It can stably ensure the processing accuracy of the workpiece: When clamping the workpiece with the pressure plate clamp, the clamp ensures the positional accuracy of the workpiece relative to the tool and the machine tool. It is not affected by the technical level of workers, so that the processing accuracy of a batch of workpieces tends to be consistent. 2. Reduce auxiliary working hours and improve productivity: the workpiece can be quickly positioned and clamped without alignment. The auxiliary working time is significantly reduced; the clamp is used to clamp the workpiece, which improves the stiffness of the workpiece and increases the cutting volume. Multi-piece multi-station pressure plate clamps are used to clamp the workpiece, and an effective clamping mechanism is adopted. These factors are conducive to improving labor production Read More »

The power chuck is a key component of the machine tool. It is used to clamp the workpiece and drive the workpiece to rotate at high speed to achieve the purpose of surface processing. Existing power chucks are all powered by pneumatics to drive the jaws to clamp or loosen the workpiece. The power chuck structure includes a chuck housing, bottom covers and movable jaw bottom covers respectively located at both ends of the chuck housing, jaws installed on the movable jaw bottom cover, a cylinder bottom cover and a piston in the chuck housing. The piston divides the space between the bottom covers into one and two cylinders, which are connected to the first and second air inlet pipes respectively. During operation, the jaws can be opened or clamped by controlling the air inlets of the first and second air inlet pipes. The clamping force of the jaws is directly related to the air pressure. Although the clamping force of the jaws can be increased by changing the inclination angle of the piston wedge, this can only be achieved by increasing the stroke of the piston. Due to the limitation of the internal space of the chuck, the air pressure of the air inlet pipe can only be increased and a more powerful air compressor can be used, resulting in an improvement in the overall sealing level and cost. Read More »

Power chuck is a fixture used to clamp workpieces in the field of machining, including hollow power chucks and medium-solid power chucks. There is a through hole in the middle of the hollow power chuck, and the matching power source such as a hydraulic cylinder is also hollow. The workpiece can pass through the front end of the hollow power chuck, while the middle part of the medium-solid power chuck and its matching cylinder are solid and are mainly used for processing disc-type workpieces. The medium-solid power chuck is connected to the oil cylinder installed at the rear end of the machine tool's rotating shaft through a tie rod. During the workpiece cutting process, the medium-solid power chuck, the tie rod and the power source rotate at high speed together with the machine spindle. Because the existing medium-solid power chuck is large in size, heavy in mass, and has large inertia when running at high speed, it increases the load on the machine tool spindle, resulting in poor operating stability of the machine tool spindle. In addition, existing power chucks also have problems such as high friction on the mating surface, low mating accuracy, no dust-proof function, and inconvenient assembly. In view of the above shortcomings in the prior art, technicians provide a method Read More »

Installation instructions for pneumatic chuck: 1. Take out the connecting sleeve, screw on the screw, and connect it to the tail of the spindle. Use a dial indicator to correct the outer circle and end face runout of the connecting sleeve to control it within 0.05 mm, and tighten the screws. 2. Take out the chuck, wipe it clean with a rag, and use a caliper to measure whether the lathe flange size is consistent with the chuck connection size. If not, complete the flange to the chuck size. 3. Take out the spiral air duct, set the decorative hoop, and install the air duct on the ventilation joint of the chuck. Then use a vise to clamp the clamp and do not damage the air pipe during installation. 4. Use the capsule to wrap the trachea in sections to ensure smoothness, and then mark No. 1 and No. 2 at the end of the trachea. Then use a thin wire to pass the air pipe through the lathe spindle, so that the air pipe passes through the spindle smoothly, and the support chuck moves backward synchronously and is gently buckled on the flange. 5. Take out the screws, fix the chuck on the flange, and measure the cylinder runout ≦0.05. 6. Tighten the air pipe and cut off the excess at the end. Read More »