1, standard parts / fasteners manufacturing industry with bolts, nuts connected fasteners a lot, should ensure that it has enough preload, but it can not be tightened too tight. If the screw is too tight, on the one hand will make the joint under the action of external force to produce permanent deformation; the other hand will make the bolt to produce permanent deformation, preload but decreased, and even cause slippery wire or broken phenomenon, and high quality service. 2, motorcycle manufacturing industry with a bolt on the motorcycle, nuts connected to a lot of fasteners, should ensure that it has enough preload, but it can not be screwed too tight. If the screw is too tight, on the one hand will make the joint under the action of external force to produce permanent deformation; the other hand will make the bolt tensile deformation, preload force but decreased, and even cause slip wire or broken phenomenon. And quality service 3, the automotive industry in the field with bolts, nuts connected a lot of fasteners, should ensure that it has enough preload, but can not be too tight tight. If the screw is too tight, on the one hand will make the joint under the action of external force to produce permanent deformation; the other hand will make the bolt tensile deformation, preload force but decreased, and even cause slip wire or broken phenomenon. And quality service 4, the construction area of steel structure with bolts, nuts connected a lot of fasteners, should ensure that it has enough preload, but it can not be too tight. If the screw is too tight, on the one hand will make the joint under the action of external force to produce permanent deformation; the other hand will make the bolt tensile deformation, preload force but decreased, and even cause slip wire or broken phenomenon. And quality service
A fastener is a generic term for a class of mechanical parts that are used when two or more parts (or components) are fastened together. Depending on the use of different cold heading machines to produce different types of fastening equipment. The types of fasteners produced by the cold heading machine are bolts, studs, screws, nuts and tapping screws. The bolts are a kind of fasteners consisting of two parts: head and screw (with external thread). Used to fasten the connection of two parts with through holes. This type of connection is bolted. If the nut is screwed off from the bolt, it is possible to separate the two parts, so the bolt connection is a detachable connection. One end must be screwed into the parts with internal screw holes, A type of fastener that has only the ends of the head that are internally threaded. When connected. The other end through the through-hole parts, and then screw the nut, even if the two parts fastened into a whole. This type of connection is called a stud connection and is a detachable connection. Mainly used for one of the connected parts of a larger thickness, requiring a compact structure, or because of frequent demolition, should not use bolted connections. By use can be divided into three categories: machine screws, set screws and special purpose screws. The machine screw is mainly used for a part that tightens the threaded hole, 3. Screw: also by the head and screw two parts of a class of fasteners. The fastening connection to a part with a through hole does not require a nut fit (this type of connection is called a screw connection and is also detachably connected; it can also be fitted with a nut for two The fastening connection between the parts is mainly used to fix the relative position between the two parts.Special use of screws such as rings and screws for the lifting parts used in the shape of the general was flat hexagonal cylindrical, 4. Nuts: with internal thread holes. Also has a flat cylindrical or flat cylindrical, with bolts, studs or machine screws, used to fasten the connection of two parts, making it a whole. But the thread on the screw for the special tapping screw thread. For fastening the connection of two thin metal members, 5. Self-tapping screw: similar to machine screw. So that it becomes a whole, the components need to make a small hole in advance, because of this screw has a high hardness, can be directly screwed into the hole in the component, so that the formation of the reaction of the internal thread. This connection is also a detachable connection. But the thread on the screw for the special wood screw with a rib, 6. Wood screw: also similar to the machine screw. The wood screws produced by the cold heading machine can be screwed directly into the woodwork (or parts) for fastening a metal (or nonmetal) part with a through hole with a wooden member. This connection also belongs to the assembly connection. Play to increase the contact parts connected surface area, 7. Washer: a shape of a flat ring of a class of fasteners. Placed between the support surface of the bolt, screw or nut and the connection part. Reduce the pressure per unit area and maintain the appearance of the connected parts is not damaged; another type of elastic washer, but also play a role in preventing the nut from loosening. Acts to prevent the movement of parts on the shaft or hole.
Currently used for cold heading machine material, in many materials, the longest is divided into two categories: a black metal and nonferrous metals two categories. Cold heading machine materials are ferrous metals mainly include steel, carbon and some other materials. From the process point of view, the use of steel in the habit of the following classification methods. According to the quality of steel sub-ordinary carbon steel, high-quality carbon structural steel, special cold heading machine steel, alloy steel; according to the composition of low-carbon steel, carbon steel, high-carbon steel, special steel; Boiling steel. Cold heading machine Non-ferrous metal materials: aluminum, copper and its alloys and other materials. Domestic commonly used copper grades are T1, T2, etc., and more for upsetting rivets, contact screws and other electrical parts. Common copper alloy with zinc brass H62, tin brass HSn62-1, lead brass HPb63-3, hardness 40-65Hv0.2 or 60-85 Hv0.2 for wear-resistant, corrosion-resistant fasteners, upsetting Rivets, machine screws, nuts and other special performance fasteners.
As the cold heading machine is in the case of heavy load, continuous production, coupled with a higher degree of automation, and most of the body movement by the crankshaft or cam control for cyclical reciprocating motion or swing, so that the acceleration caused by the impact and impact Force is very large, and the cold heading machine and the main parts of the material selection is also imperfect, so easy to use in the damage. In the practice of production and maintenance of the cold heading machine made some improvements. Improvement of the main drive section For the upsetting speed of the cold heading machine, the productivity of the large cold heading machine (the diameter of the screw rod is 10 mm or more) per minute is 60 to 70 pieces (refers to the double-heading cold heading machine), the number of stroke For 120 to 140 times / min. According to the cold heading process requirements, the initial heading speed is between 0.4 and 1 m / s. As the cold and cold machine is in the case of heavy load, speed production, coupled with a higher degree of automation, and most of the movement by the crankshaft or convex control for the cyclical reciprocating motion or swing, so that the acceleration caused by the force And the impact force is very large, and the cold heading machine and the main parts of the material selection is also imperfect, so easy to use in the bad.
1. Hardware field connection. Install the proximity switch on the device and connect the components according to the electrical schematic. 2. parameter settings. According to the requirements of the user unit, by setting the acceleration / deceleration time parameter (2202), set the starting frequency of the inverter from 1Hz to 50Hz (ie, the motor speed from 0r / min up to 1500r / min) set time is set to 3s. 3. Processing test. First in the manual mode to start the device processing parts, equipment operation is correct, to automatic mode. Set the total number of machined parts on the counter to 30, start the device, when the number of processing up to 30, the device stops running. In manual and automatic mode, turn the speed potentiometer, parts processing speed changes, the digital display shows the speed of different periods. Multi - station automatic cold heading machine 4. Emergency stop and keep. Press the emergency stop button on the control panel operator panel to stop the device. Pull the total power supply, the data on the counter remains unchanged. After the power is restarted, the machine then processes the part until it reaches the preset number and stops. 5. Reset. Press the two reset switches on the counter control panel to reset the preset number and the machining number, respectively. 6. Key protection. After the cold heading machine and the rotary key switch (SA1), the key operation on the counter operation panel is disabled.
Cold heading process (1) cold heading machine According to the theory of metal plastic deformation, at room temperature on the metal blanks to exert a certain pressure, so that in the cavity produced plastic deformation, according to the provisions of the shape and size of the shape. (2) cold heading machine must choose high quality "plastic change" good metal materials, such as riveting screw steel, its chemical composition and mechanical properties are strict standards. (3) cold heading bolts, nut molding machinery has been more models, more series of models. Cold heading machine equipment performance is reliable, high efficiency, product quality and stability. (4) cold heading machine molding upsetting force, configuration power, equipment, a large investment. So the production specifications M24 below the most economical. (5) have better surface quality, higher dimensional accuracy. Cold forging machine in the process of upsetting there is cold hardening, deformation should not be too large. Be sure to reduce cracking. (6) cold heading machine technology for the scope of large quantities, all kinds of specifications of the product, so as to reduce costs in order to produce greater efficiency.
The history and working principle of cold pier machine Cold heading machine history and working principle The world's first cold heading machine from Germany. At that time the development of cold heading machine is mainly for the purpose of a large number of World War II when the large number of shells cold heading process (1) According to the theory of metal plastic deformation, at room temperature on the metal blanks to exert a certain pressure, so that in the cavity produced plastic deformation, according to the provisions of the shape and size. (2) must choose high quality "plastic change" good metal materials, such as riveting screw steel, its chemical composition and mechanical properties have strict standards. (3) cold heading bolts, nut forming machinery has many models, multi-series models. Equipment performance is reliable, high efficiency, product quality and stability. (4) product forming upsetting force, configuration power, equipment, a large investment. So the production specifications M24 below the most economical. (5) have better surface quality, higher dimensional accuracy. Due to the process of upsetting there is cold hardening, deformation should not be too large. Reduce cracking. (6) cold heading process applicable to the bulk of large, all kinds of specifications of the product, so as to reduce costs. Modern cold heading machine has been increased from the past two simple stations to more than the current domestic newer varieties are 6 mold, 7 mold, 8 mold and other long cold heading machine, is the blank of the special cold heading equipment, On the material through the roller feed, and then followed by cutting, pressure ball, pressure angle, punching, forming six processes, a machine can be automatically completed, for batch or professional production of production of standard parts and a large number of manufacturers Large and medium-sized enterprises using standard nuts. Note: According to user requirements special production of seven stations, eight stations and other non-standard automatic cold heading machine. Multi-station automatic nuts Cold heading machines are arranged horizontally. Using cold-drawn plate material by cutting, the first punch, fine red, and other processes to produce finished products. This product is the most advanced models, can produce all kinds of special-shaped pieces, especially with the hole of the special parts and standard nut production, with high precision (diameter tolerance 0.03mm, diameter 0.03mm) speed Fast (80-240 per minute), and the production of smaller sound, fully sealed production to make production safer and cleaner. Safety operation procedure for cold heading machine 1. Do not wear gloves to operate cold heading machine. 2. Before driving, you must carefully check whether the fastening of the equipment is tight, the safety device is intact, and the work should be checked regularly to prevent the vibration and loose, resulting in accidents. 3. After the equipment is adjusted, first pull the flywheel, check the work of the agencies are normal, to be removed after the switch with the trigger, before starting the motor. Do not pull the side of the car, while starting the motor. 4. Before driving all the breakdown should be ruled out, and for short time after the air, before the test upsetting. 5. Equipment in operation, the operator should stand in a safe position, is strictly prohibited in the concave mold at the workpiece, only in the bottom to view the product. 6. In the replacement of products, you must carefully adjust the mold and punch, and carefully check the components are normal. 7. In the production process, in the event of failure, you must immediately stop, identify the reasons to eliminate hidden dangers. Brake failure, driving is strictly prohibited. 8. The bumper (bumper) must be fitted with a protective device to prevent rupture. All protective devices shall not be disassembled or lost. Features 1, crankshaft and the body, the impact of connecting rods are used in Sweden imported bearings and high wear-resistant alloy copper tile connection, flexible operation, bearing capacity, long life, low maintenance costs. 2, the body with the addition of alloy made of ductile iron 500, high tensile strength, good wear resistance. 3, equipped with brake to reduce motor power consumption. 4, cutting system using guide plate drive cutter rod, guide reciprocating motion, cutting force straight line transmission, large stability and good dynamic balance. 5, the clamp system can be 180 degrees flip or translation. Conducive to forming process arrangements. 6, equipped with frequency control device, can be in a certain range of speed. 7, equipped with fault detector and safety protection device, equipment failure automatically shut down, to give equipment and mold the largest protection. 8, the feed box to install the thrust device to improve the feeding accuracy.Read more >>