LUREN Precision Co.LTD. www.luren.com.tw Head Office: Via Marconi, - - PowerPoint PPT Presentation

Head Office: Li Hsing Factory Location: Hsin Chu Science Park - Taiwan www.luren.com.tw

LUREN Precision Co.LTD.

Distributor for European market Head Office: Via Marconi, 8 Viganò Brianza (LC)- Italy www.fubri.it

LUREN

Distributor for European market

LWT-2080 LWT-3080

LUREN CNC Worm and Thread Grinding Machines

LUREN

With this presentation we want to inform about:

• Basic of thread and worm grinding operation
• Working condition
• Description of Luren thread grinding machines

The most important characteristic of Luren grinding machines are:

• High performances
• High tech design and components
• High flexibility
• Easy to use
• Low cost

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LUREN

Basic technical information about of Thread grinding operation

The accuracy of the thread grinding process to a large extent is very much affected by the type of wheel and by the working condition. We examine now some aspects of this important operation. First examine the different types of thread and worms in accordance with the international normatives.

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The profile of the tooth of a speed reducer screws can be with four different shapes in accordance with the geometrical specification of DIN 3075 normative

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The section of this screw through the plane of its axis shows a tooth profile with rectilinear flanks on this plane. That is to say a rack with symmetrical flanks defined by the axial pressure

• angle. This type of screw is obtained by using tools with straight flanks in the axial section.

ZA–Type

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The profile of the tooth of a speed reducer screws can be with four different shapes in accordance with the geometrical specification of DIN 3075 normative

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This type of screw is obtained using double tapered tools,, with rectilinear flanks, placed along the part’s normal section. These tools may be normal turning tool, tapered finger milling cutter or grinding wheel, double tapered, small diameter milling cutter or disc grinding wheel. In this case a rectilinear flank profile will be obtained in the normal section, but not in the axial section.

ZN –Type

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The profile of the tooth of a speed reducer screws can be with four different shapes in accordance with the geometrical specification of DIN 3075 normative

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This type of screw is obtained using a large diameter double-tapered milling cutter or disc grinding wheel. Once the basic parameters of the screw are defined i.e. inside diameter, number of threads and the pressure angle, the profile will be determined by the wheel

• diameter. The smaller the diameter, the closer the profile will resemble that of screw N.

The larger the diameter, the more curved the profile will be.

ZK–Type

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The profile of the tooth of a speed reducer screws can be with four different shapes in accordance with the geometrical specification of DIN 3075 normative

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The tooth flank has a helical profile. This may be generated, for example, by a flat disc grinding wheel inclined to the pressure angle and the helix angle. It may also be generated by creating a relevant wheel profile which in turn gives a helical

• profile. Precision coupling demands this type of profile.

ZE –Type

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Luren thread grinder can grind every type of worm

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Rolling dies for high production of external thread. The accuracy and the low roughness of this tool are extremely important for the quality of the thread and the life of the roller. Helix Gashes Straight Gashes

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Wheel profiling rollers for different type of grinding machines

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These rollers are manufacturing with a special steel and incorporate differentiated grooves to facilitate the abrasive discharge

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Luren thread grinder can grind every type of worm

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It’s possible to grind special worm in accordance with the customer specification

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Luren produces two models of thread grinding machine

• Mod. LWT-2080

& Mod. LWT-3080

LUREN CNC Worm and Thread Grinding Machines

LUREN

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LUREN CNC Worm and Thread Grinding Machines

Model LWT 2080 LWT 3080 Max workpiece diameter 200 mm 300 mm Min workpiece diameter 5 mm 5 mm Max module 8 mm 12 mm Min/Max N° of gashes 1/99 1/99 Max lead helix angle ± 35˚ ± 35˚ Distance between centers 80 – 800 mm 80 – 1260 mm Max grinding slide travel 430 mm 430 mm Max workpiece weight 40 Kg 60 Kg Max grinding wheel speed 6000 rpm 6000 rpm CNC

FANUC 21i-MB FANUC 21i-MB

Length 3000/3200 mm 4000 mm Depth 2500 mm 3500 mm Height 2300 mm 2300 mm Weight 8000 Kg 8000 Kg

Technical characteristic

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LUREN CNC Worm and Thread Grinding Machines A-axis /LWT-2080/3080 (D.D.-AC Servo Motor ) N-axis B-axis Y-axis Tailstock Z-axis (Linear Motor ) Dressing Unit LWT-2080/3080

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Basic axes of thread grinding machine

LUREN CNC Worm and Thread Grinding Machines Standard dresser use two single point diamond

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LUREN CNC Worm and Thread Grinding Machines

Work-piece Spindle

Direct Drive Torque Motor Low Speed High Torque

• FANUC -

Rated Torque : 1200 Nm 260 Nm Rated Speed : 250 rpm 300 rpm Absolute Accuracy : 15 arc-sec Repeat Accuracy : 1.3 arc-sec

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Oil Cooling Linear Motor

• No backlash,
• High reliability,
• Less components,
• Easy installation,
• Long Life-time.
• CNC Control System
• FANUC Motor
• MAX. Thrust 3000N

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LUREN CNC Worm and Thread Grinding Machines Ground by Luren LWT-2080/LWT-3080 Machine

Full Profile Grinding

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LUREN CNC Worm and Thread Grinding Machines

LUREN

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LUREN CNC Worm and Thread Grinding Machines Grinding Example Grinding Data

Speed : 1600 rpm Feed : 4000 mm/min Removal : 0.2 mm Once Grinding Grinding Time 38 sec. Dressing Time 20 sec.

Worm Accuracy Worm Accuracy

Lead Error Left Tooth Flank : 2.7µm Right Tooth Flank : 2.1µm Lead Wave Left Tooth Flank : 1.3µm Right Tooth Flank : 1.5µm Left Tooth Flank : 3.0µm (max) Right Tooth Flank : 2.2µm (max)

LWT-2080/3080

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LUREN CNC Worm and Thread Grinding Machines

Big lead angle worm

Module (Mn) 6.4850 Lead angle 26˚29' 56" R Pressure angle 20˚00' 00"

• No. of start

4R Outside diameter 65 mm Base diameter 45.3051mm Length 80 mm

LWT-2080/3080

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LUREN CNC Worm and Thread Grinding Machines

Surface Roughness

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LUREN CNC Worm and Thread Grinding Machines Smart Dialogue Interface Software system combines the various design and

calculation programs for worm gears Smart profile modification for ZE ZK ZA ZN and curvature type worms

LWT-2080/3080

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LUREN CNC Worm and Thread Grinding Machines Smart Profile Modification for Worm Grinding LWT-2080/3080

LUREN

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LUREN CNC Worm and Thread Grinding Machines Smart Profile Modification for Worm Grinding LWT-2080/3080

LUREN

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LUREN CNC Worm and Thread Grinding Machines

Small Module Worm

More example of Grinding worm with LWT-2080/3080 machines

Data

Module 1.4975 Lead angle 2˚30' 20" Pressure angle 20º00'00"

• No. of start

1R Outside diameter 38 mm Length 44 mm

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LUREN CNC Worm and Thread Grinding Machines

Big Module Worm

More example of Grinding worm with LWT-2080/3080 machines

 Lead Angle 9°50' 00 "  Pressure Angle 20°00' 00 "  No. of Start 2R  Effective Length 143 mm

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LUREN CNC Worm and Thread Grinding Machines

Double lead of Worm

More example of Grinding worm with LWT-2080/3080 machines

Double Lead Module 1 2.236 Lead angle 5˚01' 44" Flute lead 7.0246 Module 2 2.184 Lead angle 4˚30' 00" Flute lead 6.8401 Pressure angle 20˚00' 00"

• No. of start

1R Outside diameter 32.5 mm Length 40 mm

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LUREN CNC Worm and Thread Grinding Machines

Roller ground by multi-ribs

More example of Grinding worm with LWT-2080/3080 machines

Roller Roller Roller

Roller Roller

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LUREN CNC Worm and Thread Grinding Machines More example of Grinding worm with LWT-2080/3080 machines

Rolling die

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LUREN CNC Worm and Thread Grinding Machines More example of Grinding worm with LWT-2080/3080 machines Worm Data Type ZK Pressure Angle 20˚ Thread 3R Outside Diameter 200 mm Depth :17.85 mm Lead Angle 7˚ 29'40" Lead 76.0479

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LUREN CNC Worm and Thread Grinding Machines High accuracy - good surfaces – short grinding time

LUREN

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LUREN CNC Worm and Thread Grinding Machines

* Max. Workpiece O.D. 130mm

* Movable design Could load longer workpiece. *Through bore in work-head.diameter130mm *Module M12 *Work-piece length 1300mm *Work-piece weight 150kg Special Work-head Design

Thank you for your attention

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