Today, I would like to share with you an ultra-precision pneumatic chuck, also known as a vertical pneumatic chuck. This chuck is produced by China's Bedford Machinery Technology (Changzhou) Co., Ltd. It is powered by air pressure and needs to be equipped with special accessories. It has a three-claw vertical appearance and an outer clamping range between ? (148~200). So what are the features of this pneumatic chuck? 1. Bedford's ultra-precision three-claw pneumatic chuck has high processing efficiency and stable clamping; 2. High positioning accuracy, and the repeated clamping accuracy can reach μ level; 3. The raw claw is precisely positioned and equipped with positioning pins to maintain good positioning accuracy during repeated disassembly and assembly of the raw claw. 4. Built-in cylinder, fully enclosed design, no pollution, ensuring the clamping stability and service life of the operation. Read More »

　Hydraulic power chucks are widely used in CNC machine tools! Today we mainly introduce the hydraulic chuck structure! 1. Wedge hydraulic power chuck The wedge structure is a commonly used structural form of hydraulic power chuck. It converts the axial movement of the chuck piston into the radial movement of the claw through the wedge groove mechanism (the most common type of hydraulic chuck) 2. Helical tooth slider hydraulic power chuck This structure of the chuck first uses a wedge groove mechanism to convert the axial movement of the chuck piston into the movement of three sliders in its chute. The tops of these three sliders are equipped with helical teeth, which form a bevel meshing relationship with the teeth at the bottom of the claw. Through the movement of the slider, The movable jaw moves radially to clamp the workpiece. It has large clamping force, high clamping accuracy and small mechanism wear. Since the moving direction of the slider in the chute of the chuck is basically perpendicular to the direction of the centrifugal force of the jaw, the clamping force of the chuck is very little affected by the centrifugal force, and the chuck has good high-speed performance. 3. Wedge-lever type movement Read More »

1. Determine the processing location and specific content of the workpiece ① The situation of the workpiece before processing in this process. For example, castings, forgings or bars, shape, size, machining allowance, etc. ②The shape and size of the parts processed in the previous process require the datum surface, datum hole, etc. processed in the previous process. ③The parts and specific contents to be processed in this process. ④In order to facilitate the preparation of processes and procedures, the rough drawing before processing of this process and the processing drawing of this process should be drawn. 2. Determine the workpiece clamping method and design the fixture. Select or design the fixture based on the determined workpiece processing location, positioning datum and clamping requirements. CNC lathes mostly use three-jaw self-centering chucks to clamp workpieces; shaft workpieces can also use tailstock tips to support the workpieces. Since the spindle speed of CNC lathes is extremely high, in order to facilitate workpiece clamping, hydraulic high-speed power chucks are often used. Because they have passed strict balance in the production plant, they have high speeds (the limit speed can reach 4 Read More »

　Today let’s talk about machine tool power chucks. 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. Lathe chuck chuck 1. Classification Common chuck power sources are hydraulic and pneumatic (lathe chuck hydraulic is more common, our company specializes in the production of pneumatic chucks and hydraulic power chucks) Hydraulic power diagram 1) Hydraulic power chuck consists of a chuck, a rotary cylinder, a directional valve, and a fuel tank. The chuck is installed on the front of the lathe spindle, the rotary cylinder is installed on the rear, and the middle is connected by a tie rod. Read More »

　There are two commonly used methods of drilling center holes. (1) Drill a center hole on the lathe, clamp the piece on the chuck, extend it as short as possible, align the flat end of the rear lathe, and then shake the tailstock handwheel slowly and evenly to drill the center hole. After drilling to the size, let the center drill remain in the original position for a few seconds to make the center hole round before exiting; or feed gently so that the cutting edge of the center drill cuts a thin layer of chips from the 60° cone surface to reduce the surface roughness of the center hole. During the process of drilling the center hole, you should also pay attention to retracting the tool frequently, clearing the chips in time, and providing sufficient cooling and lubrication. This method is suitable for shaft workpieces with smaller diameter and lighter weight. (2) Drill the center hole after setting the center. For workpieces with larger diameters, heavier weights, or more complex workpieces that cannot drill the center hole on a lathe, the center is often marked on the workpiece, and then the center hole is drilled with an electric drill on a drilling machine or on a boring machine. Read More »

　When turning general shaft workpieces with one clamp and one top clamping, especially heavier workpieces, one end of the workpiece can be clamped with a three-jaw self-centering or four-jaw single-action chuck, and the other end can be supported with a rear center tip, as shown in Figure 2-11. This method is called one-clamp and top clamping. In order to prevent axial displacement of the workpiece due to the feed force, a limit support can be installed in the tapered hole at the front end of the spindle, as shown in the figure. The workpiece steps can also be used for position limiting, as shown in the figure. This method of clamping is safer and more reliable and can withstand larger feed forces, so it is widely used. This method is best used when turning shaft workpieces. When using the rear center to install the support workpiece, you must first drill a center hole on the end face of the workpiece. The center hole is the positioning reference for the finishing of shaft workpieces (such as finishing turning and grinding), and has a great influence on the processing quality of the workpiece. If the roundness of the central hole is poor, the roundness of the processed workpiece will be poor, the cone surface of the central hole will be rough, and the surface roughness of the workpiece will be poor. Read More »

Today I will tell you about the difference between installing a three-claw and a four-claw chuck? What are the advantages? First of all, when turning, the workpiece must be clamped in the machine tool fixture, aligned and clamped, so that it always maintains the correct position during the entire cutting process. The quality and speed of workpiece installation directly affect the processing quality and production efficiency of the workpiece and should be taken seriously. When turning the outer circle, according to the shape, size, quantity and machining accuracy of the workpiece, it can generally be divided into the following four clamping methods, namely, three-jaw self-centering chuck, four-jaw single-action chuck, one-clamp-one-top clamping and two-pin clamping. The structure of the three-jaw self-centering chuck The structural shape of the three-jaw self-centering chuck is as shown in the figure. It is a universal fixture widely used on lathes. It mainly consists of an outer shell, three claws, three small bevel gears, a large bevel gear and other parts. When the square row of the chuck wrench is inserted into the square hole 1 of the small bevel gear 2 and rotated, the small bevel gear takes Read More »

　With the rapid development of electromechanical technology and automation technology, the basic and strategic position of the machine tool industry in the manufacturing industry is becoming more and more important. As an important functional component of machine tools, the chuck plays an increasingly prominent role. It is a key basic component to achieve the performance, accuracy, reliability and other indicators of the machine tool host. Its advantages and disadvantages directly restrict the development of the machine tool industry. Compared with power chucks, machine tool manual chucks have the advantages of wide application range, strong versatility, convenient adjustment, and low price. They are especially widely used on horizontal lathes. 'Design, Manufacturing and Selection of Manual Chucks for Machine Tools' focuses on the relevant knowledge of manual chucks for machine tools. It is divided into nine chapters, including an overview of machine tool manual chucks, machine tool manual chuck structural types and parameters, machine tool manual chuck optimization design and analysis, machine tool manual chuck process flow analysis and preparation of key parts, machine tool manual chuck detection and analysis, machine tool manual chuck accessories, and machine tool manual chuck selection. Read More »

　The power chuck is a functional component of the machine tool that clamps and positions the workpiece through hydraulic, pneumatic or electric means, using the radial movement of the movable jaws distributed on the chuck body. With the popularization of CNC machine tools and the increasing demand for improving production efficiency, power chucks are increasingly used, including hydraulic power chucks and supporting cylinders. Working principle of power chuck: According to the different power sources of current power chucks, common power chucks are divided into three categories: hydraulic power chuck, pneumatic power chuck (referred to as pneumatic chuck) and electric chuck. Among them, the hydraulic power chuck combines hydraulic transmission technology and self-centering chuck technology. It takes advantage of the large power density ratio of hydraulic transmission and has the advantages of large clamping force, high speed, and compact structure. Hydraulic power discs have been widely used in CNC machine tools and have become indispensable basic functional components for medium and high-speed CNC lathes, CNC grinders and CNC turning and milling centers. Hydraulic Read More »

The method of transforming ordinary chucks into 'elastic clamps' When using CNC lathes to turn bearing rollers, the machine tool's own clamps have certain problems: they are only suitable for turning bars with relatively thin dimensions; when the bars are thicker (larger than Φ45mm), there will be insufficient clamping force, causing problems such as damage to tools and fixtures. For this reason, after actual analysis, it was decided to transform the self-contained clamp into an elastic clamp. Lathes mainly machine bearing rollers. The original design of the lathe comes with an ordinary wedge-type hollow hydraulic power three-jaw chuck, as shown below. ▲ Hydraulic power three-jaw chuck This type of chuck uses a hollow pull rod to push the connection plate to move upward under the action of oil pressure. The slider moves accordingly, transmitting the force to the clamping jaws, and the squeeze jaws move along the slideway to clamp the workpiece; when the hollow pull rod pushes the connection plate downward under the action of oil pressure on the other side, it drives the clamping jaws to move away from the center of the circle, that is, the clamping jaws are opened. ▲ Hydraulic clamping mechanism in order to reduce material Read More »

Several ways to use the safety chuck. The safety chuck intersecting line cutting machine has a simple structure. When calculating the system, one rotation of the chuck is used as a parameter. It has a correct degree measurement. Relatively speaking, the roundness requirements of the pipe are also lower. Sometimes the pipe is slightly curved, and it can be cut by adjusting the position of the bracket. During operation, it is very important to pay attention to the adjustment of the bracket position at all times to maintain the level of the pipe. If this position is not adjusted well, large cutting errors will occur. In addition, there is always a blind area close to the chuck area that cannot be cut, which affects the yield rate of the pipe. Safety chucks are generally used for small-diameter pipes with a diameter not exceeding 600mm, and this type of structure is often used. The outer chuck can be provided with corresponding transmission slots and release slots. The outer chuck can be provided with a boss, and the inner chuck can be provided with a groove that matches the boss. The positioning mechanism can be a positioning spring set on the outer chuck. The hydraulic chuck is set at the drill pipe connecting end of the spindle to slow down the Read More »

　　What are the types of indexing chucks? The indexing chuck uses a belly tower wrench to rotate a bevel gear, which drives a flat rectangular thread, and the three jaws move in a central motion. The pitch of the flat rectangular thread is the same, so the three claws move at the same distance and function as an automatic center. The three-claw disc consists of a large bevel gear, three small bevel gears and three claws. Three small bevel gears mesh with a large bevel gear. The back of the large bevel gear has a plane thread structure, and three claws are evenly installed on the plane thread. When the indexing chuck pulls the small gear with a wrench, the large bevel gear will rotate, and the flat threads on the back will cause the three claws to approach or withdraw from the center at the same time. Because the four acromions are used to move the four feet respectively, the common four-foot clamps do not play a self-centering role. However, the position of the four legs can be adjusted to clamp various rectangular and irregular workpieces. When turning a large number of workpieces with an indexing chuck, a soft jaw plate can be used during processing to improve the process. Read More »