October 7, 2021

CITIZEN MACHINERY ASIA CO., LTD.

Machinery Asia Achieves Cumulative Shipment of NC Automated Lathes

20,000 Units Shipment Memorial Ceremony and New Showroom Opening Ceremony Held

CITIZEN MACHINERY CO., LTD. (Karuizawa Headquarters: Miyota-machi, Kitasaku-gun, Nagano-ken, President: Keiichi Nakajima) will start sales in December 2022 of the Miyano “BNA42SY” fixed headstock type CNC automatic lathe, which will be the first machine with hand scraped slideways to be equipped with its unique LFV (low-frequency vibration cutting) technology that successfully resolves various issues relating to chips.We will exhibit this product at JIMTOF 2022, which will open on November 8, 2022.

The Miyano “BNA42SY” is a best-selling machine with a 2-spindle/1-turret configuration enabling complex machining, and is capable of stable machining with its highly rigid base and turret.Hand scraped slideways are used on all axes, and equipping the turret with LFV technology on this model makes it possible to resolve various issues relating to chips, even with difficult-to-cut materials like inconel and stainless steel that require rigidity on machines used for machining, helping customers achieve more stable production.

Hand scraped slideways are characterized by sliding surfaces that make contact mediated by an oil film, large contact faces and high rigidity, and by taking sufficient time to verify the effects of vibration on these slideways and resolving the issues discovered, we succeeded in equipping LFV in conjunction with them.

Number of Machine Models Equipped with LFV Technology Increased to 12, to be Further Increased Progressively

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Having succeeded in equipping LFV technology with the hand scraped slideways that have been so strongly requested by customers, we will continue to increase the number of machines equipped with LFV.

* Explanation of hand scraped slideways: Broadly speaking, automatic lathes have two slideway mechanisms (mechanisms whereby the machine moves by sliding): “hand scraped slideways” and “roller slideways”.The “hand scraped slideways” have sliding surfaces that make contact mediated by an oil film, leading to the advantages of large contact faces and high rigidity.The “roller slideways” operate by rolling using linear guides and roller guides in their mechanism, leading to the advantages of excellent responsiveness and operability.

About LFV Technology

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The servo axes are vibrated in the axial direction using a unique control technology whereby cutting is performed while synchronizing this cutting with the rotation of the spindle, and chips are broken up into smaller pieces by providing “air-cutting” time where the tool makes no contact during cutting.

Effects of LFV technology

• 1. Improves the efficiency of small-diameter deep hole machining
• 2. Makes it possible to finely break up chips even when turning difficult-to-cut materials, which tends to generate long chips
• 3. Prevents scratching of workpiece surfaces
• 4. Substantially reduces the volume of chips
• 5. Achieves high-precision machining over long periods

* “LFV” is a registered trademark of Citizen Watch Co., Ltd.

About LFV Technology

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The Miyano “BNA42SY” fixed headstock type CNC automatic lathe is a best-selling machine which, despite its compact size, has a highly rigid base and turret with a 2-spindle/1-turret configuration enabling complex machining.

Main Characteristics of the BNA42SY

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1.Base and turret rigidity increased

2.12-station turret featuring a Y axis and left/right simultaneous machining realize high efficiency and complex machining capability

The 12-station turret equipped with an Y-axis and the capability of simultaneous left/right machining using the front and back spindles, including superimposition machining where the back spindle follows machining at the front spindle, realizes high efficiency including shorter machining time, as well as complex machining capability.

3.Rotary tools mountable at all turret stations for improved multifunctional performance

Major Specifications

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Model		BNA42SY
Max. machining diameter of front spindle	Collet	ø42㎜
	Power chuck	6inch
Max. machining length		100㎜
Spindle speed		Max.6,000min-1
Max. chucking diameter of back spindle	Collet	ø34㎜
	Power chuck	4inch
Back spindle speed		Max.5,000min-1
Axis strokes (feed distances)	X axis	140mm
	Y axis	70mm（+35mm/-35mm）
	Z axis	285mm
Number of stations for mounting tools		12 (1 turret)
Revolving tool capacity		Max. 12
Max. drilling diameter by revolving tool		ø10㎜
Max. tapping diameter for revolving tools (cutting tap)		M8
Tool size	Turning tool	□20mm
	Sleeve	ø25mm
Motors	For spindle drive	11/7.5 kW/5.5 kW (15%/15 min/cont.)
	For back spindle drive	5.5/3.7kW(15min/cont.)
	For driving rotary tools	2.8/1.0kW
Required floor space		W2,350 × D1,433mm
Mass		3,650kg