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Working principle of slow wire processing

 Slow wire walking, also called low-speed wire walking, is a kind of CNC machining machine tool that uses continuously moving fine metal wire as an electrode to pulse spark discharge on the workpiece to generate a high temperature of over 6000 degrees, ablate metal and cut into a workpiece. The principle of wire processing is the phenomenon that there is a gap between the wire electrode and the workpiece, and the metal is removed by continuous discharge. Since the slow-moving wire cutting machine adopts the method of wire electrode continuous feeding, that is, the wire electrode is processed during the movement, so even if the wire electrode is worn out, it can be continuously supplemented, so it can improve the machining accuracy of the parts and slow the wire. The surface roughness of the workpiece processed by the cutting machine can usually reach Ra=0.8μm and above, and the roundness error, linear error and dimensional error of the slow-moving wire cutting machine are much better t

How Do Cnc Swiss Machines Work

How Do Cnc Swiss Machines Work Save 0 What Is Swiss Machine –The full name of the walking CNC lathe, it can also be called the spindle box mobile CNC automatic lathe, the economical turning and milling compound machine tool or the slitting lathe. It belongs to precision machining equipment, which can complete compound  machining such as turning, milling, drilling, boring, tapping, and engraving at one time. It is mainly used for batch  machining of precision hardware and special-shaped shafts. This machine tool first originated in Germany and Switzerland. In the early stage, it was mainly used for precision machining of military equipment. With the continuous development and expansion of industrialization, due to the urgent needs of the market, it was gradually applied to the  machining of civilian products; the development of similar machine tools in Japan and South Korea Earlier than China, it was mainly used in the military industry in the early days. After the war, it was gradually

Spring Design Attention And Roll Forming Method

Spring Design Attention And Roll Forming Method The coiling characteristics and methods of springs are divided into cold coiling method and hot coiling method. Cold winding method: When the diameter of the spring wire is less than 8mm, the cold winding method is adopted. High-quality carbon spring steel wire is usually first cold drawn and then heat treated. After winding, it is generally not quenched, but only tempered at low temperature to eliminate the internal stress during winding. Hot-rolling method: Springs with larger diameter (>8mm) spring wire should use hot-rolling method. Hot rolled springs must be quenched and tempered at medium temperature. The Design Process Of Various Springs ·          Installation space: When designing a  compression spring , it is necessary to have a clear understanding of the space required for the installation of the spring, in order to effectively grasp the basic manufacturing conditions of the compression spring, including the outer diam

The development trend of crankshaft manufacturing technology in the future

The crankshaft is one of the key components of a car engine, and its performance directly affects the life of the car. The crankshaft is subjected to heavy loads and constantly changing bending moments and torques during operation. The common failure modes are bending fatigue fracture and journal wear. Therefore, the crankshaft material is required to have high rigidity, fatigue strength and good wear resistance.

1. Casting technology
(1) Smelting

For the melting of high-grade cast iron, a large-capacity intermediate frequency furnace or a frequency conversion intermediate frequency furnace will be used for smelting, and a direct-reading spectrometer will be used to detect the composition of the molten iron. The treatment of ductile iron adopts subcontracting to develop new varieties of spheroidizing agents, and adopts advanced inoculation methods such as flow inoculation, in-mold inoculation and compound inoculation. The parameters of the  cnc manu facturings are controlled by a computer and displayed on the screen.

(2) Modeling

Lost foam casting will be developed and promoted. In sand casting, boxless injection molding and extrusion molding will receive attention and will continue to be promoted and applied in new plants or remodeled plants. The original high-voltage molding line will continue to be used, and some of the key components will be improved to realize automatic core assembly and core setting.

2. Forging technology
Automatic lines with hot die forging presses and electro-hydraulic hammers as the main engine are the development direction of forging crankshaft production. These production lines will generally use precision cutting, roll forging (cross wedge rolling) billet, intermediate frequency induction heating, etc.

3. medical machining technology
Crankshaft roughing will widely use advanced equipment such as CNC lathes, CNC internal milling machines, CNC lathes and broaching machines for CNC turning, internal milling, and turning-broaching of the main journal and connecting rod journal to effectively reduce the deformation of the crankshaft. Crankshaft finishing will widely use CNC-controlled crankshaft grinders to finish grinding its journals.

This kind of grinding machine will be equipped with automatic dynamic balance device of the grinding wheel, automatic tracking device of the center frame, automatic measurement, automatic compensation device, automatic dressing of the grinding wheel, constant linear speed and other functional requirements to ensure the stability of the grinding quality. The status quo of high-precision equipment reliance on imports is expected to remain unchanged in the short term.

4. Heat treatment technology and surface strengthening technology
(1) Intermediate frequency induction hardening of crankshaft

The intermediate frequency induction hardening of the crankshaft will adopt a microcomputer-controlled closed-loop intermediate frequency induction heating device, which has the characteristics of high efficiency, stable quality, and controllable operation.

(2) Soft nitriding of crankshaft

For mass-produced crankshafts, in order to improve product quality, a microcomputer-controlled nitrogen-based atmosphere gas nitrocarburizing production line will be used in the future. Nitrogen-based atmosphere gas nitrocarburizing production line is composed of front cleaning machine (cleaning and drying), preheating furnace, nitrocarburizing furnace, cooling oil tank, post cleaning machine (cleaning and drying), control system and gas production and distribution systems.

(3) Crankshaft surface strengthening technology

Nodular cast iron crankshaft fillet rolling strengthening will be widely used in crankshaft machining. In addition, compound cnc machining such as fillet rolling strengthening and journal surface quenching will also be widely used in crankshaft machining. Forged steel crankshaft strengthening methods will be more The ground adopts the shaft journal and fillet quenching treatment.

The main cause of crankshaft fracture:
(1) The engine oil has deteriorated after long-term use; serious overload and overhang, causing long-term overload operation of the engine and occurrence of bush burning accidents. The crankshaft was severely worn due to the engine burning.

(2) After the engine is repaired, the loading period has not passed the running-in period, that is, overload and overload, and the engine has been overloaded for a long time, cnc operating the crankshaft load to exceed the allowable limit.

(3) Surfacing welding was used in the repair of the crankshaft, which destroyed the dynamic balance of the crankshaft, and did not perform balance check. The unbalance amount exceeded the standard, which caused the engine to vibrate greatly and caused the crankshaft to break.

(4) Due to poor road conditions, the vehicle is seriously overloaded and overloaded, the engine often runs within the critical speed of torsional vibration, and the failure of the shock absorber will also cause the crankshaft torsional vibration fatigue damage and fracture.

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