Miyano bne 51 cnc lathe

Miyano bne 51  cnc lathe 
What are MIYANO's strengths?

Miyano bne 51 mahine tools  
To talk about the strengths of MIYAN0, a brand from Citizen Machinery Miyano's
world famous machine tool product lines, we first have to go back to its roots which lie in the manufacture of precision files that were hand tools produced
for use in industrial applications.
Making use of its technology, from 'MIYAN0 files' becoming the envy of many professional workmen at the time, MIYANO began to produce spark wheels for cigarette lighters.
Here, the indispensable factor to produce the precision and exceptionally durable spark wheel was the use of highly rigid, precise and exceptionally durable automatic lathes.
And since 1948, when M1YAN0 produced the AL-525,
the first cam-type automatic lathe to be made in Japan, the company has focused on
continuous improvement in performance.
MIYAN0 has since cultivated three main characteristics for ìts machine tools:
high accuracy, high rigidity and high durability.
These factors have been very successfully demonstrated in the manufacture of automotive
and other medium-sized precision parts that have become the brand's strength leading to
great acclaim both in Japan and overseas.
Currently, the major features of MIYANO products lie in high rigidity spindles, hand scraped slideways and a platform style construction of the machine bed-all traditions that MIYANO has passed down to the present day.

Manufacturing faithful to the 'fundamentals imparts hígh rígídíty and hígh accuracy.
Optimum bearing combinations
One of MIYANO's major characteristics is the high rigidity spindle design that is the keystone to machining. Spindles with a thick-walled construction and large diameter bearings minimise deflection and enable continuously stable operations. The combination of precision double-row cylindrical roller bearings that bear radial loads and precision angular contact ball bearings that maintain high precision and a stable rotational accuracy are also key elements.
Moreover, MIYANO's unique construction ensures there are influences on machining
accuracy from longitudinal displacement due to heat generation. Numerous technologies such as these enable powerful cutting and the delivery of sufficient rigidity to support the mounting of a heavy duty 8-inch chuck. 5ince the rigidity of the spindle contributes to improved damping characteristics of the machine construction (vibration is easily attenuated) it also helps to extend cutting tool life and reduce running costs. Maintaining stable rotational accuracy improves the quality of machining, giving higher performance in mass production operations and therefore helps reduce the workload of the operator.

Strict quality control
These processes are not special, but rather fundamental to the design and manufacture of MIYANO machine tools. An important task in spindle assembly is the fitting of the bearings. Applying the appropriate preload during the fitting increases the rigidity and run-out accuracy thus helping to maintain machining stability. The fitting of cylindrical roller bearings, which require a high level of skill, is carried out by very experienced technicians. The grease that is injected into the bearings plays an important role in maintaining the rotational accuracy coupled with controlled test running during initial operation. This test running is performed around-the-clock, while controlling any temperature rise, to ensure the grease that was injected into the bearings settles
giving a stable rotating accuracy. 'Faithfulness to the fundamentals' is what characterises MIYANO manufacturing.
Quill constructíon gives excellent maíntainabiiíty
The quill construction should be considered as one that limits machine downtime and
offers high production efficiency. MIYANO spindles are not secured directly to the machine headstock instead, a 3-step quill construction has been adopted so ideal levels of maintenance is ensured. When a spindle has to be replaced on a standard automatic lathe, the spindle bearings are re-assembled at the customer's factory leading to the machine being out of production for an extended period. By using a quill construction, the only work involved is to remove the spindle assembly and replace it with a new one which takes about half a day's work.
Workpiece examples
The end faces of these components commonly feature large diametertapped holes of
M12 or greater which can often lead to slippage in the chuck or tap breakage.
MIYANO machines feature highly rigid spindles which are designed to accommodate large diametertapping work. For example, the entire machining sequence of a hydraulic spool can now be completed on a single machine operation.

The scraping work undertaken by skilled technicíans ensures
hígh rígídity, hígh accuracy and long life.
scraping work that underpins hand scraped slideways
Hand scraped slideways are a key technology area where MIYANO takes príde. The
exceptional rigidity and damping characteristics of these slideways provide a surface contact over a wide area, not only to enable powerful cutting such as required for hard turning operations, but also to extend the life of cutting tools. In scraping, the allowance removed per scraping as minute as 2 microns with slideway surfaces hand finished while checking contact areas by applying red or vermillion dye. It can take up to 10 hours dependant on the stroke of the machine, to complete a single slideway.
With box slideways, scraping is performed across three contact faces per side in order
to compose a single axis which means a total of six locations have to be scraped. Here
skilled technicians take responsibility for all scraped surfaces and in order to eliminate
aпy individual differences, the scraping work is quantitatively managed by measuring
the thrust required.

High frequency induction hardening of slideways
When materials of the same composition and hardness slide against each other,
galling can occur. Sometimes a resin-based material is affıxed to the slideway but this
has the demerit that the material wears quickly which over long periods of operation
affects machining accuracy. Also, the coefflcient of thermal expansion is different from
metal and therefore movement of the slideway can be influenced by any fluctuation i n
temperature. MIYANO focuses on metal fıtting technologies and prevents galling by
subjecting the rail slide (convex side) ofthe slideway to high frequency induction hardening and annealing.
Exceptíonal maíntaínabílíty
Ease of maintenance is a major characteristic of hand-scraped slideways. When repairing age-related wear on rolling slideways, the guide set has to be replaced which takes
a long time and is very expensive. With hand-scraped slideways on the other hand,
high precision machining can easily be recovered simply by adjusting the gibs. 5ome
customers have even maintained levels of accuracy for more than 10 years by simply
adjusting the gibs themselves.
Workpiece examples
Automotive parts are relatively commonly made from materials with high hardness
and toughness such as S45C, SCM or hardened materials which require hard turning.
These are therefore diffiıcult to machine while maintaining high orders of accuracy.
Here, M1YAN0 machines characterised by their hand scraped slideways have a track
record of being adopted by many automotive manufacturers and thus especially adept
at machining parts for transmissions, ABS, airbags and turbochargers.

Prioritizing machining accuracy, yet meeting even more demanding requírements.
Bed with a 'platform construction
The 'platform' refers to a reference flat surface such as a surface plate used for inspecting and measuring components. MIYANO has adopted a construction that models the platform' making it possible to maintain a stable flatness over the longer term. Ribs (elements fixed at right angles to the face) help to suppress deformation. The heavy construction of the bed which includes the ribs is also an important feature helping to achieve exceflent rigidity and damping characteristics. Mounting the spindles and turrets on this highly stable, smooth and uniformly flat surface (slanted at 30 deg) minimises distortion of the units mounting faces due to heat generated from each of the components. Even if the individual units do thermally expand, the associated displacement is in the same direction (perpendicular to the mounting face) so the relative distortion between the workpiece and the cutting tool is suppressed.

Integrated tank
MIYANO continues to use coolant tanks that are integrated with the machine bed. This
prioritizes machining accuracy. The problem normally associated with integrated
coolant tanks is that any heat from the coolant is transferred directly into the bed.
MIYANO avoids this problem by adopting a structure whereby the coolant is distributed
in a uniform fashion around the bed thus minimising any differences in temperature
between individual parts and supressing any deformation of the bed. The tank also has
a synergistic effect with the thick bed as warmed coolant is slow to cool down thus
supressing any influence of abrupt temperature change. With regard to working convenience, the task involved in collecting chips has been reduced by sorting the chips with
fine mesh filters and by designing the ribs so as not to obstruct the chip collection in the
tank. For customers wishing higher efficiency chip processing, MIYANO recommends
the installation ofthe optional chip conveyor.
Thermorevision suppressing changes in dimensions
The use of MIYANO's Thermorevision system on the platform construction bed is
designed to help customers who demand even higher levels of machining accuracy.
The unit is able to accommodate dimensional changes due to thermal displacement by
measuring the temperature of each part using sensors installed inside the machine. Any
changes are compensated by setting the coefficient according to the type of coolant
being used. In order to compensate correctly, it is important to know the characteristics
of the machine and how to apply this information which is effective due to the smooth
thermal displacement control of MIYANO machines.
Workpíece examples
Brass is commonly used for water faucet fittings and hydraulic couplings. In order to
shorten cycle times, form tools are often used however, due to the characteristics of the
material, the maćhining load can become even greater than diffıcult-to-cut materials.
For example, when broaching the key groove geometry on the inside diameter of
coupling components for use in air conditioning units, chipping can occur due to vibration set up in the machine. The MIYANO 'platform' construction bed with its high rigidity
and exceptional damping characteristics delivers a stable performance.

Key facts:
• high accuracy
• high rigidity
• high durability
• high rigidity spindles
• hand scraped slideways
• platform style construction of the machine bed