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What is the crankshaft? What is the Hardness
Most crankshafts are made of ductile iron, and the quenching hardness varies depending on the grade. The hardness is mostly between HB130 and -240.
The crankshaft bears the force transmitted by the connecting rod and converts it into torque, which is output by the crankshaft and drives other accessories on the engine to work.
The crankshaft is subjected to the combined action of centrifugal force from rotating mass, periodic gas inertia force, and reciprocating inertia force, which causes the crankshaft to withstand bending and torsional loads. Therefore, it is required that the crankshaft has sufficient strength and stiffness, and the surface of the journal should be wear-resistant, work evenly, and have good balance.
Surface Strengthening Technology for Crankshaft
Nodular cast iron crankshaft fillet rolling strengthening will be widely used in crankshaft processing. In addition, composite strengthening processes such as fillet rolling strengthening and journal surface quenching will also be widely used in crankshaft processing. Forged steel crankshaft strengthening methods will more often use journal and fillet quenching treatment.
Crankshaft soft nitriding
For mass-produced crankshafts, in order to improve product quality, a microcomputer controlled nitrogen based atmosphere gas soft nitriding production line will be adopted in the future. The nitrogen based atmosphere gas soft nitriding production line consists of a front cleaning machine (cleaning and drying), a preheating furnace, a soft nitriding furnace, a cooling oil tank, a rear cleaning machine (cleaning and drying), a control system, and a gas production and distribution system.
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What is the function of the crankshaft?
The function of the crankshaft is that it is an important component in the engine. It bears the force transmitted by the connecting rod and converts it into torque, which is output through the crankshaft and drives other accessories on the engine to work. The crankshaft is subjected to a combined action of centrifugal force from rotating mass, periodic gas inertia force, and reciprocating inertia force, causing it to withstand bending and torsional loads.
The following are the functions of the crankcase:
1. The crankcase is an important component in the engine. It bears the force transmitted by the connecting rod and converts it into torque, which is output through the crankshaft and drives other accessories on the engine to work;
2. The crankshaft is subjected to the combined action of centrifugal force from rotating mass, periodic gas inertia force, and reciprocating inertia force, causing the crankshaft to withstand bending and torsional loads;
3. Prevent oil deterioration; Prevent leakage of crankshaft oil seal and crankcase gasket.
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What is the function of a car crankshaft
The crankshaft is the main rotating part of the engine, which is responsible for transforming the up and down reciprocating motion of the piston into its own Circular motion.
Moreover, the engine speed we usually refer to is the speed of the crankshaft, and the gas pressure on the plug becomes rotational power, which is transmitted to the transmission mechanism of the chassis and drives the valve train and other auxiliary devices.
When the engine is working, the crankshaft bears the effects of gas force, inertia force, and inertia moment. The force is large and complex, and it can withstand the impact of alternating loads. At the same time, the crankshaft is a high-speed rotating component, so it is required to have sufficient stiffness, strength, and balance, good ability to withstand impact loads, good wear resistance and lubrication.
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What is the difference between bolts and studs
Bolts often refer to those with heads or large points, such as outer hexagonal bolts;
Screws often refer to small points, such as Allen screws, pan head/flat head/large flat head/round head machine screws, etc;
The studs should have no heads and cannot be turned with tools.
1、 Bolt
(1) Machine element, cylindrical threaded fasteners with nuts. A type of fastener consisting of a head and a screw (cylindrical body with external threads), which needs to be matched with a nut to securely connect two parts with through holes.
(2) This type of connection is called bolt connection. If the nut is unscrewed from the bolt, it can separate these two parts, so bolt connection is a detachable connection.
(3) There are many names for bolts, and each person's name may be different. Some people call them screws, some call them bolts and nails, and some call them fasteners. Although there are so many names, the meaning is the same, they are all bolts.
(4) Bolt is a common term for fasteners. A bolt is a tool that utilizes the physical and mathematical principles of the oblique circular rotation and friction of an object to gradually tighten the mechanical components of the object.
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How to quickly distinguish between bolts and nuts
Bolts, nuts, and screws are all fasteners. Bolts and nuts can be used together, and screws can be used separately. The difference between a bolt and a stud is that one end of the bolt has a polygon that can be twisted, while the stud only has an external thread on a cylindrical piece.
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The difference between anchor bolts and bolts
Bolt is a kind of fastener which is a Machine element and consists of head and screw. It needs to be used together with nut to fasten and connect two parts with through holes. There are many names for bolts, some people refer to them as screws, fasteners, and screws. A bolt is a tool for gradually tightening objects due to the mathematical and physical principles of oblique circular rotation and friction.
Anchor bolts are a type of bolt connection, and there are many other types of bolt connections
Anchor bolts fix the screw part and the concrete substrate together in some form and cannot be separated. The only detachable parts are nuts; A bolt is a detachable connection that separates two parts by unscrewing the nut from the bolt.
Anchor bolts belong to post anchoring technology, which requires drilling first and then screwing in screws for anchoring; The bolts are pre drilled.
The head of the anchor bolt is buried in the concrete substrate, while the head of the bolt is exposed outside.
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