1, thread cutting Generally refers to the use of forming tools or abrasive tools in the workpiece processing methods, mainly turning, milling, tapping, threading, grinding, grinding and cyclone cutting. When turning, milling, and grinding threads, the machine's drive train ensures that the turning, milling, or grinding wheel moves exactly and evenly along the axis of the work piece, one revolution per revolution of the workpiece. During tapping or threading, the tool (taper or die) rotates relative to the workpiece, and the previously formed thread groove guides the tool (or workpiece) for axial movement. Turning threads on a lathe can use a turning tool or a comb (see threading tools). Turning the thread with a turning tool is a common method for producing single-piece and small-batch threaded workpieces due to the simple structure of the tool; turning the thread with a comb comb cutter has high production efficiency, but the tool structure is complex and is only suitable for medium and large batch production. Short-threaded workpiece turning fine teeth. The pitch accuracy of trapezoidal threads on ordinary turning lathes can only reach 8 to 9 grades (JB2886-81, the same applies hereinafter). When threading is performed on a specialized threaded lathe, productivity or accuracy can be significantly improved. 2, thread milling Milling with a disk or comb cutter on a thread milling machine. Disc cutters are mainly used for milling trapezoidal threads on workpieces such as screws and worms. Comb-type milling cutters are used for milling. Because they use ordinary threads and taper threads, multi-edged milling cutters, the length of their working part is larger than the length of the thread being machined, so the workpiece only needs to rotate 1.25~1.5 rpm to process. Completed, high productivity. The pitch accuracy of thread milling can generally reach 8~9 grades, and the surface roughness is R5~0.63 microns. This method is suitable for mass production of general-precision threading or roughing before grinding. 3, thread grinding Mainly used for precision threading of hardened workpieces on threaded grinders. Thread grinding is divided into two types according to the shape of the grinding wheel: single-line grinding wheel and multi-line grinding wheel. Single-wheel grinding can reach a pitch accuracy of 5-6 grades, and the surface roughness is R1.25-0.08 micron, making it easier to dress the wheel. This method is suitable for grinding precision screw, thread gauges, worms, small batches of threaded workpieces and sharpening hobs. Multi-line grinding wheel grinding vertical grinding method and cut into two kinds. The grindstone width of the longitudinal grind method is less than the length of the grinded thread, and the grindstone can be counter-threaded to the final size by moving it longitudinally once or several times. The width of the grindstone that is cut into the grindstone is greater than the length of the grinded thread. The grindstone cuts into the surface of the workpiece in a radial direction. The workpiece can be grinded after about 1.25 rotations. The productivity is high, but the accuracy is slightly lower and the dressing of the grindstone is more complicated. The plunge cut method is suitable for grinding large batches of taps and grinding certain fastening threads. 4, thread grinding Using a softer material such as cast iron, a nut or screw-type thread lap is used to carry out forward and reverse rotation grinding on the part of the machined thread where the pitch error is present to improve the pitch accuracy. Hardened internal threads are usually also ground to eliminate changes and improve accuracy. 5, tapping and threading Tapping is the use of a certain torque to screw the tap into the pre-drilled bottom hole of the workpiece to process the internal thread. The thread is made by cutting a male thread on a bar (or pipe) workpiece. The accuracy of tapping or threading depends on the accuracy of the tap or die. Although there are many methods for machining internal and external threads, the internal threads of small diameter can only be processed by taps. Tapping and threading can be done manually. Lathes, drilling machines, tapping machines and threading machines can also be used. 6, thread rolling The forming rolling die is used to plastically deform the workpiece to obtain a threading method. Thread rolling is generally in the rolling machine. The reeling machine or the automatic lathe attached with automatic thread rolling heads is suitable for mass production of standard fasteners and other external threads of threaded couplings. The outside diameter of the rolling thread is generally not more than 25mm, the length is not more than 100mm, and the thread precision is up to level 2 (GB197-63). The diameter of all the blanks is approximately equal to the diameter of the machined thread. Rolling generally cannot process internal threads, but it can be used for non-grooved extrusion taps of cold-worked workpieces (maximum diameter up to 30 mm). The working principle is similar to tapping. The required torque when cold-extruding the internal thread is about 1 times larger than the tapping, and the machining accuracy and surface quality are slightly higher than the tapping. The advantages of thread rolling are: 1. The surface roughness is less than turning, milling and grinding; 2. After rolling, the surface of the thread can improve the strength and hardness due to cold hardening; 3, the material utilization rate is high; The productivity is multiplied than the cutting processing, and it is easy to realize automation; 4, rolling die life is very long. However, the rolling thread requires the hardness of the workpiece material does not exceed HRC40; 5, the blank size precision is higher; 6. The requirements for precision and hardness of the rolling die are also high, making the die more difficult; 7, not suitable for rolling asymmetric thread. According to different rolling molds, thread rolling can be divided into two types of wire rolling and rolling. Silk The two screw threads with a thread profile are staggered by 1/2 pitch and are arranged relative to each other. The static plate is fixed and the moving plate makes a reciprocating linear motion parallel to the static plate. When the workpiece is fed between the two plates, the moving plate advances and presses the workpiece to plastically deform the surface into threads. Rolling thread There are three kinds of radial thread rolling, tangential thread rolling and rolling head rolling. Radial thread rolling: Two (or three) thread rolling wheels with thread profiles are mounted on mutually parallel shafts. Workpieces are placed on bearings between two wheels and two wheels rotate in the same direction at the same speed. One round also performs radial feed movement. The workpiece rotates with the thread rolling wheel, and the surface is pressed into the thread by radial extrusion. For some screw rods with low precision, similar methods can be used for roll forming. Tangential rolling: Also known as planetary rolling, the rolling tool consists of a rotating central rolling wheel and three fixed arc-shaped wire plates. During thread rolling, the workpiece can be continuously fed, so the productivity is higher than that of the niobium yarn and the radial one. Rolling thread rolling: It is carried out on an automatic lathe and is generally used for machining short threads on workpieces. The rolling head has 3 to 4 rolling wheels that are uniformly distributed around the workpiece. During thread rolling, the workpiece rotates and the rolling head feeds axially, rolling the workpiece out of the thread. Fast Mounted Concrete Batching Plants Concrete Batching Plants,Cement Concrete Batching Plant,Mini Stationary Automatic Batching Plant,Ready-Mix Fixed Type Concrete Batching PlantChina Electrical Concrete Batching Plants,Cement Concrete Batching Plant,Mini Stationary Automatic Batching Plant,Ready-Mix Fixed Type Concrete Batching Plant, we offered that you can trust. Welcome to do business with us.China Electrical Concrete Batching Plants,Cement Concrete Batching Plant,Mini Stationary Automatic Batching Plant,Ready-Mix Fixed Type Concrete Batching Plant, we offered that you can trust. Welcome to do business with us.The pl series batching machine used in this product consists of a feeding mechanism, a weighing system, an electrical control system and other components. The structure of the batching machine is arranged in a "good" shape, which is conveyed by a belt conveyor and weighed by a plurality of sensors for accurate measurement.
Electrical Concrete Batching Plants,Cement Concrete Batching Plant,Mini Stationary Automatic Batching Plant,Ready-Mix Fixed Type Concrete Batching Plant Shandong Zeyu Heavy Industry Science and Technology Co.,Ltd. , https://www.sdmobileconcretebatchingplant.com
The pl series batching machines are equipped with four aggregate silos, which can be customized according to customer needs. The aggregate bin feeds the weighing hopper, and the material is weighed by the microcomputer control.It is divided into single metering and accumulative metering, and is measured by electronic scale. High precision of ingredients and reliable use.