Review of CIMT2015 crankshaft camshaft grinding machine

The crankshaft and camshaft grinding machines exhibited at CIMT 2015 are mainly based on CNC tangent point tracking follow-up grinding, but the number of physical objects exhibited by the machine tools is small, and the corresponding new products and new technology achievements are also slightly insufficient.

1 Main exhibits in the territory (1) JKM8320A CNC high speed concave camshaft grinding machine
This machine is an exhibit of Jiangxi Jieke Machine Tool Co., Ltd. It uses large and small grinding wheel to turn the combination and follow-up grinding to realize the roughing and finishing of the whole concave camshaft in one clamping, and can be equipped with automatic loading and unloading mechanism, suitable for the production line. . JKM8320A grinding machine adopts cam numerical control grinding software with independent intellectual property rights, static pressure bearing grinding wheel electric spindle, large and small grinding head turning mechanism, and efficient and low energy circulating filter cooling system.

(2)MK8220/SD double wheel frame CNC cut point tracking crankshaft grinder
This machine is a national major science and technology special product, produced by Shanghai Machine Tool Works Co., Ltd., and has reached an order with Shanghai General Motors (SGM). The machine tool is a double-wheel CNC cutting point tracking crankshaft grinding machine, which can realize the external cylindrical grinding of the crankshaft main journal and the connecting rod neck in one clamping. It is suitable for the crankshaft grinding of the four-cylinder and six-cylinder machines of the engine production line of the automobile whole machine factory. . The machine tool adopts a horizontal layout and the wheel frame moves. The grinding machine adopts a monolithic casting bed, and the front and rear beds are integrated. The workbench is a single-layer cast iron platform surface that is fixedly mounted on the front of the bed. The grinding wheel shaft adopts hydrostatic bearing and built-in motor, and the motor is arranged between hydrostatic bearings. The lateral feed of the two grinding wheel frames is driven by a linear motor to achieve the high dynamic performance requirements of the follower grinding of the grinding wheel frame. The rail pair is a closed static pressure rectangular rail that is pressure lubricated by a separate oil supply system.

(3) B2-K1018 double wheel frame follower type CNC crankshaft grinder
Developed by Beijing No. 2 Machine Tool Works Co., Ltd., this machine is an ultra-high-speed precision grinding equipment for the precision grinding of the crankshaft connecting rod neck and spindle neck of automobile engine. It can realize the batching of crankshaft connecting rod neck and main journal with one clamping. Precision machining, suitable for use in crankshaft production lines. B2-K1018 is the scientific and technological achievement of the National 863 Program and the National Major Science and Technology Project, and won the 2014 China Machinery Industry Science and Technology Award. The machine tool is fixed by a workbench, and the double-wheeled wheel frame is moved to the rear. The double-wheel frame cross slide slides in the form of rear movement to realize the lateral and longitudinal movement of the wheel carrier (X1, X2, Z1, Z2). The two grinding wheel frame feed shafts are directly driven by a linear motor, and the closed static pressure rail structure reduces the transmission error of the intermediate link and improves the positioning accuracy and response speed of the X axis. The carriage drive is driven by an AC servo motor + ball screw pair. The headstock spindle adopts the spindle structure of high-precision rolling bearing and is equipped with an angle encoder for closed-loop control. It is equipped with crankshaft link neck follower grinding software and user-specific grinding interface software.

2 Major overseas exhibits
(1)JUCAM 6L camshaft grinding machine
According to the German JUNKER company, two sets of shafts with different diameters of grinding wheels are arranged on the front and rear of the machine wheel frame. The cycloidal tracking grinding process can be used to achieve camshaft grinding with various shapes such as concave and convex surfaces. The coarse and fine grinding can be completed, and the camshafts of various cylinder numbers can be processed through the replacement procedure to achieve high flexibility and high efficiency. The JUCRAM series of camshaft grinding machines are made of a single bed made of polymer concrete. The head frame is supported by rolling bearings, which is driven by a built-in torque motor to rotate the workpiece. The angle encoder is closed-loop controlled and equipped with a special hydraulic clamp. The carriage adopts a rectangular hydrostatic guide rail, servo motor + rack and pinion drive, and the grating ruler is closed-loop controlled. The feed axis adopts static pressure cylindrical guide rail, servo motor + static pressure screw drive, and grating ruler closed-loop control. The grinding wheel spindle uses an electric spindle supported by a rolling bearing. Equipped with a hydraulic servo center frame. The wheel frame can be swung around the B axis and is suitable for machining different contour camshafts.

(2) LT2 (E) type crankshaft grinder (double wheel frame)
The Cinetic Landis Crankshaft Grinder in the UK is very special. The machine uses the follow-up grinding method to grind the crankshaft connecting rod neck or other journal. The machine has the center height, the whole machine volume, the grinding wheel size, the total power, the processing cycle, etc. The older generation of products has been optimized for better results. The LT2(E) series crankshaft grinder adopts the whole cast iron bed. The CNC system is dedicated to the Landis CNC6400. The head frame is supported by rolling bearings. The built-in torque motor drives the workpiece to rotate, the angle encoder is closed-loop controlled, and the special hydraulic chuck is equipped. Equipped with a hydraulic servo center frame, the center frame hydraulically drives three tows to clamp the main section of the crankshaft in the middle of the crankshaft, which overcomes the weakness of the bending rigidity of the crankshaft workpiece. The diamond wheel dresser is mounted on the rear side of the tailstock. The dresser spindle is supported by angular contact ball bearings and is directly driven by a variable speed motor.

3 Conclusion
The crankshaft and camshaft are key components of the internal combustion engine. Throughout the various crankshaft and camshaft processing equipment of this exhibition, it can be seen that with the development of the automobile industry, the engine has also been upgraded and developed rapidly, and domestic and foreign related grinding products have also developed rapidly, and its main The trend is to increase productivity, increase automation and improve processing quality. For the products of this year's exhibition, the following three obvious characteristics are shown:

(1) In terms of application fields, concentrated in the internal combustion engine industry, especially in the passenger vehicle engine industry, medium and small crankshaft and camshaft grinding machines are developing rapidly, with a large number and fast update.
(2) As far as the technical level is concerned, the cutting point tracking grinding technology has become the mainstream, and the direct drive technology is widely used, and the proportion of the follower type crankshaft and camshaft grinding machine is increasing.
(3) In terms of equipment type, many famous crankshaft and camshaft grinding machine manufacturers no longer only focus on a single crankshaft and camshaft grinding machine, but on the entire crankshaft and camshaft machining production line, providing users with complete sets of equipment for the production line. And provide a complete technical solution for supporting services.

Of course, through the comparison of the domestic and foreign crankshaft grinding machines, we also clearly found that the development status of China's crankshaft grinding machines is not optimistic, there is still a certain gap in the reliability of domestic grinding machines, and the gap between software and control systems and human-computer interaction operability. Also more obvious. High precision, high efficiency and high reliability are still the direction that domestic crankshaft grinder manufacturers need to work hard.

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