EN-CARBO

Vacuum Carburizing Furnace

Vacuum Carburizing Furnace

EN-CARBO

Vacuum Carburizing Furnace

NVC Series

EN-CARBO

High-temperature carburizing reduces carburizing time

2.5
Vacuum carburizing
1040˚C

Carburizing depth (mm)2

Vacuum carburizing
980˚C
Vacuum carburizing
930˚C
Conventional gas
carburizing 950˚C

1000.5

1Carburizing time (hours)

1.5

2Features of EN-CARBO

Advantages of ethylene as a carburizing gas
Ethylene gas, used in (C2H4) EN-CARBO (patent pending), has the following properties good for decompressed carburizing.
●Less than 5% the gas emissions compared to gas carburizing●As easy to manage as propane●Simple exhaust system reduces maintenance work

Safe and clean environment
Flameless operation eliminates worries of fire for a safe and clean work environment. Easy to configure
assembly lines with production machinery and heat treatment, which is not possible with conventional gas
carburizing, to eliminate dangerous dirty and demanding work.

Reducing running costs
Saves energy and reduces heat loss by using a cold wall method and can operate unattended all night to greatly
reduce operating costs.

Operation so easy even someone inexperienced with heat treatment can do it
Atmosphere control is not required so carburizing depth is easy to control just by setting the time andtemperature. Once the carburizing pattern is set, operations can be easily done from the touch panel. Afterinstallation, full automation from processing to finished work is possible.

Flexibility
Installation is easy for a wide selection of equipment to match production targets (laboratory or factory setups)
so that it is easy to handle production many products in small lots.

Carburizing quality of EN-CARBO

High performance pulse carburizing and super carburizing are
possible with vacuum carburizing
Results of pulse carburizing
Comparison photos of surface for carburizing depth of 0.7 mm (Hv550)

55

Conventional vacuum carburizing

Pulse carburizing

Example of excess carburizing of sharp edge

Improved results with pulse carburizing

Image of texture of supercarburizing

Globular carbide is produced to (1)improve fatigue strength and (2) increaseabrasion resistance. (Hv900 for SCM415)

Carburizing workflow diagram

Preparation work(from previous process)Process complete(to next process)Oil cooling(quenching)

Heat upand soaking

Evacuation

Drain solvent
Exhaust fumes

Inject nitrogen gas andcontrol chamber pressure

Evacuate heating chamber
to low pressure state

Evacuation

EN-CARBOt
Ethylene

Evacuation

Evacuation

Temperature fallto quenchingtemperature

Carburizing
Carburizing and diffusion are repeateddepending on processing conditions

Diffusion

Typical heat cycle

Heating chamber
temperature
Heating chamberpressure

Risingtemperature

Soaking

Temperature
fall toquenchingtemperature

Carburizing/Diffusion

CoolingoilPulse carburizing
Carburizing gas
Low pressure conditions (0.1 kPa abs)

E

E

Automated NVC line

E

Automated vacuum carburizing line (NVC-6)

Automated line (options)
A fully automated line can be set up by combining the clean vacuum carburizing furnace (NVC) and vacuum degreasing
equipment (NVD) and tempering furnace (ERD).
Stock table

Loading Unloading

ConveyorsystemTempering furnace

Vacuum Degreasing Equipment
Clean Master

Vacuum Carburizing Furnace
EN-CARBO

OpTempering

Pre and post washing

Carburizing process

ERD Series

NVD Series

NVC Series

Ref

Remove any press oil orcutting oil, post washingremove any quenching oil.

Perform carburizing and quenching (refined quenching)

Perform tempering

CarConRemCon

Equipment check and quality assurance offered by NACHI

Aut

Supporting assurance of quality for our customers.

Setting goals for quality

Customers

Fixing heat
treatment
conditions

Test run withsampleproduct

Equipment quality check andquality assurance processes
Test run at fullproduction
volumeTesting heat
treatmentwith actual
equipment

Heat treatment quality check

Heat treatment quality check●Product deformation and microstructure,
hardness etc●Product durability inspection●Product deformation and microstructure,hardness, distortion etc●Product durability inspection

TokyToya

CleanInternEaste●ForOg
PhE-M

Specwitho

EN-CARBO
Exterior dimensions

Top view

Side view

Vacuum pump

Nitrogen gas surge tank(option)

MaintenancespaceW
Entrance

H
Entrance

PowerPanel
Control panel
Floor level
L

Standard specifications
NVC-1

NVC-3

NVC-6

NVC-8

NVC-10400×400×400

460×620×550

610×950×610

680×1,100×680

760×1,220×760

Maximum capacity (Kg/G.C.)

100300

600

800

1000

Heater capacity (kW)3545100

110160Exterior dimentions(W x L x H mm)

2,700×3,500×2,900

3,500×5,100×2,900

4,800×6,200×3,100

4,800×6,300×3,400

4,800×6,700×3,400

1500

3,500

8,000

9,000

11,000Model
Effective dimensions(W x L x H mm)

Oil volume (L)Options
Refining mechanism

Required for super carburizing, high-temperature carburizing, and reheating.

Carbonitriding mechanism

Required to nitro carburizing structure.

Convection heating mechanism

Required to shorten soaking time with convection fan installed in heating chamber.

Remote monitoring system

Required to diagnose malfunctions via a telephone line.

Conveyor equipment (front table and automated carts)

Required to load and unload the tray from the furnace.

Automated line system

A fully automated cycle can be configured by combining the vacuum carburizing furnace (NVC) andvacuum degreasing equipment (NVD), tempering furnace (ERD) and a stock table.

Tokyo Head Office:Toyama Head Office:Shiodome Sumitomo Bldg. 17F, 1-9-2 Higashi-shinbashi,
Minato-ku, Tokyo 105-0021, Japan
Phone: +81-(0)3-5568-5111 Fax: +81-(0)3-5568-5236
1-1-1 Fujikoshi-Honmachi, Toyama 930-8511, JapanPhone: +81-(0)76-423-5111 Fax: +81-(0)76-493-5211

Clean Thermo - Tech Div.
International Trade Div.
Eastern Japan Main Branch

Phone: +81-(0)76-471-2981 Fax. +81-(0)76-471-2987
Phone: +81-(0)3-5568-5240 Fax. +81-(0)3-5568-5236
Phone: +81-(0)3-5568-5287 Fax. +81-(0)3-5568-5292●For engineering questions contact Clean & Thermo-Tech Div. at 176-12
Ogake, Namerikawa-shi, Toyama 936-0802, Japan
Phone: +81-(0)76-471-2981 Fax: +81-(0)76-471-2987
E-Mail: cthinfo@nachi-fujikoshi.co.jp
Specifications and configurations may change due to product developments
without prior notice.

CATALOG NO.

F5246E2006.01.Z-MIZUNO