In China, the use of sliding guide rails is still the majority due to the low speed of the machine tool
and the manufacturing cost, but the number of machine tools using ball guides and roller guides is
rising rapidly. Since the rolling guide has the advantages of high speed, long life, preloading, and
convenient installation, with the improvement of machine tool performance and numerical control
requirements, the increase of the use ratio of the rolling guide is an inevitable trend. (The moving
speed of the machining center of the JIMT exhibition from 1996 to 2002 The number of units
displayed on the left vertical axis and the moving speed of the horizontal axis machine tool) To
improve the production efficiency of the machine tool, it is necessary to increase the speed of the
The velocity statistics of the machining center exhibited at the Japan International Machine Tool
Show from 1996 to 2002, the Y-axis is the number of units, and the X-axis is the fast-forward speed.
In Japan, the feed rate of machine tools is refreshing every year, which is obviously a trend of high
speed. For example, machine tools with a speed of 60 m/min are increasing every year, and these
machines use NSK products extensively. In China, machining centers with a speed of 60 m/min have
been started, and the demand for high-speed ball screws and linear guides has also increased
NSK has been developing bearings since 1916 and has a history of producing bearings for 90 years
and ball screws for 45 years. In recent years, NSK has also developed high-speed silent ball screws
and high-load roller linear guides, which will provide strong support for the development of high-
performance machine tools in China. Bearing manufacturing technology is the strength of NSK. Based
on this rolling technology, it continuously develops and produces ball screws, linear guides, spindle
units and all rolling parts used in almost every part of the machine. In the 1980s, NSK's precision
bearings and precision ball screws played a very important role in the process of CNC machine
tooling in Japan.
At CCMT2006, NSK will showcase some advanced products.
A few years ago, Japan began to produce machine tools with speeds exceeding 100 m/min. In
order to meet its high-speed demand, NSK has developed a BSS series high-speed ball screw with a
DN value of 220,000 (DN = shaft diameter x number of revolutions), a quiet, new lubrication structure
and a new circulation method.
The high speed of the machine tool and the high acceleration and deceleration requirements make
the load of the ball screw increase. In order to meet the requirements of high speed, a large lead ball
screw can generally be used. However, the use of a large lead ball screw can cause insufficient load
capacity and insufficient rigidity. The new BSS series high-speed ball screw developed by NSK
features low noise and low vibration. Thanks to the new cycle method, the DN value, which is the
product of the shaft diameter and the number of revolutions, can reach 220,000, which is double the
existing product. Moreover, the noise can be reduced by 5 to 7 decibels. In addition, because there is
no steel ball circulation pipe, the outer diameter of the nut can be reduced by 15% to 30% compared
with the existing similar products. A high dust seal and a maintenance-free automatic lubrication
element K1 can be added as needed. It has many specifications for medium lead and large lead, and
its products have been well received by many large machine tool manufacturers in Japan.
For more than 20 years, NSK has focused on the development of linear ball guides.
In terms of rigidity, the FEN analysis technology is used to optimize the design to minimize the
internal deformation. For the slider, the deformation of the opening is small, thus ensuring the
In recent years, China's auto industry has developed rapidly. By 2010, the annual domestic
production of automobiles in China is expected to reach 10 million units. The development of the
automotive industry has also driven the development of other industries, and the demand for
injection molding machines has also increased substantially. The demand for injection molding
machines is not only in the automotive industry, but also in the IT and semiconductor industries in
China as a pillar industry. There is also a high demand for high precision, high performance and high
efficiency. The special screw for injection molding machine - HTF series is developed according to this
At present, the injection molding machines produced in China are basically hydraulic. In recent
years, electric injection molding machines have been rapidly developed in Japan. The main difference
between the electric injection molding machine and the hydraulic injection molding machine is the
driving method. The electric injection molding machine is not driven by hydraulic pressure but driven by a servo motor or a ball screw. So far, in Japan, electric injection molding machines have
accounted for 75% of the total number of injection molding machines. According to the survey data
of the company, the ratio of electric type to hydraulic type is increasing year by year, and the electric
injection molding machine has achieved 1000t maximum.
The hydraulic injection molding machine is converted into an electric injection molding machine.
The main part that needs to be modified is the injection molding part and the mold clamping part.
Others include the injection nozzle positioning part and the mold release part. Among them, the
injection molding and clamping part require high load bearing capacity, especially the ball screw of
the injection part, and the plastic material with higher viscosity needs to be shot at a high speed and
maintained, with a stroke of 20-150 mm, 100-250 mm/ The slower speed of sec, repeated movement
under high load conditions. Therefore, for the ball screw of the injection molding part, the ability to
move under a small stroke and have a good ability to withstand high loads is a design must pay
attention to the ball screw.
Due to the electrification of the injection molding machine, the bearing capacity of the ball screw is
required. For the high load requirements of the full electric injection molding machine, NSK has
developed the world-leading screw for the injection molding machine - HTF series ball screw At
present, the market share of electric injection molding machines in Japan is 80%. The shape of the
HTF series large load ball screw.
The machine tool industry, like other industries, must pay attention to environmental issues.
Therefore, there are certain restrictions on the use of lubricating oil and waste oil treatment. To this
end, NSK has developed a long-term maintenance-free automatic lubrication element K1 that can be
used on bearings, ball screws and linear guides, and promises to operate for 5 years or 10,000 km
NSK has four technical research centers (Japan, USA, Europe, China) around the world. The
Technology Research Center is responsible for the evaluation tests, life tests and product quality
verification required for product development research. Technical strength. The research center of
the technology research center has played a great role in the research of product development and
the management of product quality, making NSK products fully trusted by customers.
NSK prides itself on its market share in the world's number one ball screw. The market share of
bearings is the highest in Japan and the third in the world. The market share of linear guides is the
third in the world. The ball screw is at the highest level in the industry in terms of speed, precision
and other major technical parameters, and is at the forefront of the world's machine tools and
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