How to correct the three-jaw chuck in hydraulic chuck? Read More »

　　A brief analysis of the new turning method using a three-claw chuck instead of a dial Abstract: A new turning method using a three-claw chuck instead of a dial can improve productivity, reduce costs, and simplify the installation of workpieces. Analyze and discuss the construction technology of the triangular claw plate. During turning, for shaft workpieces that require high coaxiality and need to be turned around, double centers are often used to clamp the workpiece and rotate with the spindle through the dial and clamp. However, this method has relatively low production efficiency, high cost, and the installation operation is more complicated. The construction technology of using a three-claw chuck instead of the dial has certain advantages compared with it. In the era of competition, enterprises must pay attention to improving production efficiency, reducing production costs, and simplifying construction processes. The turning method of using a three-jaw chuck instead of a dial is a relatively advanced turning method. 1 Types and process improvements of three-jaw chucks With the increasing demand for high-precision and high-speed mechanical processing, in order to meet the diversification and high-standard machines pursued by users, Read More »

　　In order to ensure that the lathe chuck can still maintain good accuracy after long-term use, lubrication becomes particularly important. Incorrect or inappropriate lubrication will lead to abnormal function at low pressure, weakened clamping force, poor clamping accuracy, abnormal wear and jamming, etc., so the chuck must be lubricated correctly. First, apply molybdenum disulfide grease (black in color) at least once a day, and drive the grease into the chuck oil nozzle until the grease overflows the jaw surface or the inner hole of the chuck (the inner hole protective sleeve and the connecting nut). However, if the chuck rotates at a high speed or a large amount of water-based cutting oil is used for processing, more lubrication is required, which must be determined according to different situations. Secondly, be sure to use an air gun or similar tool to clean the chuck body and slide surface at the end of the operation. What you need to do next is to remove the chuck, disassemble it and clean it at least every 6 months, keep the sliding surface of the clamp jaw clean and lubricate it, and extend the life of the chuck. And use anti-rust cutting oil to prevent rust inside the chuck. Read More »

　　A chuck is a mechanical device used to clamp workpieces on machine tools. A machine tool attachment that uses the radial movement of the movable jaws evenly distributed on the chuck body to clamp and position the workpiece. The chuck generally consists of three parts: the chuck body, the movable jaw and the jaw driving mechanism. The minimum diameter of the chuck body is 65 mm and the maximum is 1500 mm. There is a through hole in the center to facilitate the passage of workpieces or bar materials; the back has a cylindrical or short conical structure and is connected to the end of the machine tool spindle directly or through a flange. The chuck is usually installed on lathes, cylindrical grinders and internal cylindrical grinders. It can also be used with various indexing devices on milling machines and drilling machines. In order to achieve better accuracy and stability in machine tool processing, the chuck has become an important 'plus point'. There are currently two main categories of chucks on the market: domestic chucks and imported (Taiwan and foreign) chucks. In terms of domestic chucks, Changzhou Bidefu occupies a larger market share. chuck pins in Taiwan Read More »

　In machining, rectangular workpieces or special-shaped workpieces are often encountered. For the processing of rectangular workpieces, if a four-jaw chuck is used for clamping, the adjustment is time-consuming, the positioning accuracy is low, and a high level of lathe technology is required. If a V-shaped vise is used to position the clamping mechanism, the attachments are complicated and manufacturing is difficult. For special-shaped workpieces, such as designing special fixtures, there are many processes, long time, low efficiency, high cost, manufacturing and assembly accuracy are limited by certain conditions, and special fixtures lack versatility. As one of the most basic and common fixture types in machining, the three-claw chuck moves equally radially when clamping the workpiece. Therefore, the three-claw chuck is used to clamp the workpiece. The clamping part is generally a cylindrical surface or a flat surface. But if the workpiece does not have a suitable surface for clamping by the claw, how to clamp it? From a simple attachment for clamping square materials with a rectangular cross-section, to a special clamp design for clamping blanks with irregular cross-sections, to a modified three-jaw chuck (soft jaw) for processing special shapes Read More »

　　In the current domestic industrial environment, whether it is CNC punch machines or CNC equipment such as punch machine tools, hydraulic chucks and pneumatic chucks are used to clamp workpieces to ensure the accuracy of CNC equipment. Hydraulic chucks and pneumatic chucks are manufactured through specialized processing techniques to ensure the normal operation of CNC equipment without quality problems. Chucks can be divided into two-claw, three-claw, four-claw, etc. All kinds of chucks produced by Bedford can perform clamping work on CNC lathes to help produce more perfect workpieces on CNC lathes and machine tools. Hydraulic chucks and pneumatic chucks are commonly used in CNC punch machines, CNC lathes, etc. The leap-forward development of the machinery manufacturing industry has to overcome the technical difficulties of one road and cannot be separated from the development of CNC lathes. In order to better handle all types of workpieces, chucks are used to hold workpieces during production, so that the workpieces can be specifically processed according to reasonable design dimensions. High-quality pneumatic and hydraulic chucks are now Read More »

An automatic indexing chuck is a mechanical device used to hold workpieces on machine tools. A machine tool accessory that uses the radial motion of the movable jaws evenly distributed on the chuck body to clamp and position the workpiece. Automatic indexing chuck generally consists of a chuck body, a moving claw and a claw driving mechanism. The diameter of the chuck body is as small as 6S mm and as large as 1500 mm. There is a through hole in the center, which can penetrate the workpiece into the bar; the back is a cylindrical or short conical structure, connected to the end of the machine tool spindle directly or through a flange. The chuck is usually installed on lathes, cylindrical grinders and internal cylindrical grinders, and can also be used with various indexing devices on milling machines and drilling machines. There are several methods for daily maintenance of automatic indexing chuck: 1. After the operation, be sure to use an air gun or similar tool to clean the chuck body and sliding surface. 2. Use anti-rust cutting oil to prevent rust inside the chuck, because rust on the chuck will reduce the clamping force and make the workpiece unsafe. Read More »

　Using cutting oil with anti-rust effect can prevent rust inside the chuck, because rust in the chuck will reduce the clamping force and prevent the workpiece from being clamped. 'Bedford' brand three-jaw chuck is produced by its own brand and has been specialized in manufacturing chucks and jaws for more than 10 years. It has cooperated with many domestic and foreign chuck manufacturers. In line with the principle that quality is the productivity of the enterprise, strict inspection is required one by one before leaving the factory. Customers can buy with confidence. The power is output through a 0.75KW three-phase asynchronous motor fixed at the end of the machine tool. The power is transmitted to the transmission shaft through the coupling. The transmission shaft directly drives the reduction device inside the chuck, thereby driving the coil wire to rotate and causing the claws to move centripetally or centrifugally, thereby achieving the purpose of holding the workpiece. Our company's chuck is a mechanical device used to clamp workpieces on machine tools. A machine tool attachment that uses the radial movement of the movable jaws evenly distributed on the chuck body to clamp and position the workpiece. Chuck is average Read More »

　When operating machine tools, we must first definitely understand what the scope of the work we are doing includes. Here are nine types for you. How to clamp the workpiece firmly during use? This will use a clamp. Now I will summarize the clamps we often use in operation. The following is a detailed introduction, I hope it will be helpful to everyone. 1. Summary of commonly used fixtures 1. Chuck. It can be said that the chuck is familiar to our robots but not the familiar clamp. The chuck is hundreds of years old. It can be said to be a very classic fixture. 2. T-shaped workbench. The T-shaped workbench can be said to be very classic. Wherever there is machinery, there is a T-shaped workbench. 3. T-shaped block, screw, pressure plate and nut. It is difficult to imagine how the workpiece would be clamped on the machine tool without these combinations. 4. Vise, Max. For workpieces that cannot be pressed by the pressure plate, you can consider using a bench vise or Max clamp. 5. Magnetic Read More »

　Manual three-claw chuck structure: The three-claw chuck is composed of a claw plate body, a small bevel gear, a large bevel gear (the other end is a plane thread) and three claws. The three claws have the same threads as the plane threads to match them. The three claws are evenly distributed at 120 degrees in the guide groove in the claw plate body. The tapered hole of the claw plate body cooperates with the outer conical surface of the front end of the lathe spindle to play a centering role. The torque is transmitted through the key, and then the chuck body is locked on the spindle with a nut. When one of the small bevel gears is rotated, the large bevel gear is driven to rotate, and the plane thread on it drives the three claws to move toward the center or outward at the same time, thereby achieving automatic centering. The centering accuracy is not high, about 0.05~0.15mm. The three claws are divided into positive claws and reverse claws. In some chucks, the claws can be reversed to form reverse claws. When the reverse claws are replaced, larger diameter workpieces can be installed. When the diameter is small, the workpiece is clamped between three long claws (a below), and the three claws can be Read More »

　　1. When processing a large number of workpieces with high concentricity, piece-by-piece correction will increase a lot of auxiliary time and affect productivity. The previous solution was to add a set of rings, machine a cast iron ring to fit the workpiece inside the ring, and use a chuck to tighten the ring. 2. Due to the wear and tear of the three-jaw chuck during application, three types of accumulated errors have occurred. In order to control the cost, it is usually used improvised, and the cast iron ferrule is modified and a Ф85 elastic ring is added. When manufacturing the elastic ring, the shape and position tolerance must meet the drawing design standards. An opening parallel to the axis direction is cut on the elastic ring, with a width of about 5mm. The material is spring steel, the hardness after quenching and tempering is HRC35~45, because the elasticity is better in this hardness range. When installing the elastic ring, it must be placed correctly to avoid tilting. The centering accuracy of the ground three-claw chuck can be good, and the three-claw chuck should be cleaned before grinding. Read More »

　　1. The manufacturing errors of the positioning parts, guide parts and tool parts on the three-jaw chuck and the amount of wear during use will change the correct positional relationship between the machine tool, the tool and the workpiece, and can cause processing deviations. 2. The size of these machining deviations can also be determined based on the calculation of manufacturing tolerances of key components of the fixture. It is also possible to measure the actual deflection of a current set of fixtures or a set of fixtures that have been used and worn. According to the measurement results, the centering error of the three-claw self-centering chuck usually can reach 0.1~0.15mm. 3. From the structure of the three-claw self-centering chuck, basically every part of it is a clearance fit. There are certain gaps between each part. For example, the I-shaped groove of the claw and the three-claw chuck housing slide back and forth, creating a certain gap; the plane thread is sleeved on the mandrel of the housing and needs to be rotated, so there is a gap; the three-claw chuck is locked on the flange and also has radial movement. Read More »