Vertical vacuum furnace assists in vacuum heat treatment of metal components for an electrical appliance company in Shandong.

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Vertical vacuum furnace assists in vacuum heat treatment of metal components for an electrical appliance company in Shandong.

1. Client Introduction

Client Name: Shandong Electrical Appliance Company (A well-known domestic manufacturer of electrical components)

Industry: Manufacturing of low-voltage electrical appliances, relays, and precision metal components

Core Needs: High-cleanliness, oxidation-free heat treatment of metal components to eliminate processing stress and improve contact reliability

This client has long provided high-reliability relays, contactors, and precision terminal assemblies for power systems, industrial control, and household appliances. With the trend towards miniaturization and high load capacity in products, higher requirements are placed on the surface condition, hardness consistency, and residual stress control of internal metal components (such as contacts, springs, and armatures) after heat treatment. Traditional air furnace heat treatment leads to oxide scale and surface discoloration, severely affecting electrical contact performance and welding processes. Therefore, the client urgently needs a dedicated system capable of performing batch heat treatment of metal components in a vacuum environment.

2. Equipment Introduction

Equipment Name: Vertical Vacuum Furnace

Model : PT-VM500-3LWG
Operating Temperature: ≤500℃
Ultimate Vacuum: 1×10⁻² Pa (Mechanical pump + Roots pump or molecular pump combination)

Furnace Structure: Lightweight ceramic fiber refined furnace chamber, low heat capacity, rapid heating and cooling

Heating Element: Molybdenum-containing resistance wire, strong oxidation resistance, fast heating rate

Temperature Control System: PID intelligent program temperature control, SCR power regulation, temperature control accuracy ±1℃

Insulation Material: High-purity alumina polycrystalline fiber, free of impurities, high tensile strength, significantly better energy-saving effect than ordinary fibers.

Core Features: Three independent heating chambers share one vacuum chamber, allowing for separate or simultaneous heat treatment of different processes, greatly improving production efficiency.

Control System: Independent electrical control cabinet, touch screen + PLC, capable of storing multiple process curves, real-time display of parameters such as temperature, vacuum, and heating current.

Safety Protection: Over-temperature alarm, vacuum pump interlock, cooling water under-voltage protection, emergency gas/power outage protection.

This vertical vacuum furnace is specifically designed for high-volume, oxidation-free heat treatment of small-sized metal components. Three independent heating chambers can operate different programs under the same vacuum environment, meeting the needs of multi-variety, small-batch production.

3. Equipment Application

Specific Process: Vacuum heat treatment of metal components (including stress-relief annealing, reduction treatment, vacuum degassing, aging treatment, etc.)

Typical Processing Objects:

Copper alloy contacts (AgCdO, AgNi, AgSnO₂ contacts);

Iron-nickel alloy springs and armatures;

Stainless steel precision stampings;

Beryllium bronze elastic elements;

Main Advantages of Vacuum Heat Treatment:
Completely avoids oxidation and discoloration, maintaining a metallic luster on the workpiece surface

Removes residual processing stress, improving dimensional stability

Eliminates adsorbed gases within the material, enhancing weldability and electrical contact reliability

Three chambers with independent temperature control allow for simultaneous processing of parts made of different materials or with different process requirements.

Customer Actual Usage Results:
Simultaneous operation of different temperature profiles significantly increases single-batch throughput;

No oxide film on the contact surface after treatment, with a stable decrease in contact resistance;

The hardness fluctuation range of the springs is greatly reduced;

Product yield is significantly improved.

4. Customer Feedback

"We previously tried various atmosphere-protected furnaces and ordinary vacuum furnaces, but either the oxidation control was unsatisfactory or the production efficiency was too low. What attracted us most to this vertical vacuum furnace was its design of three independent heating chambers sharing a single vacuum chamber—we can simultaneously process different grades of copper contacts and iron-nickel springs without interference, and the vacuum level remains stable at 10⁻² Pa, leaving the workpiece surface bright and new after processing. The molybdenum-containing resistance wire heats up very quickly, from room temperature to 400℃ in less than 10 minutes, and the alumina fiber furnace chamber provides excellent insulation, with the outer wall temperature only about 30℃ higher than room temperature. The electrical control cabinet is easy to operate; our operators mastered the programming in half a day. After a year of operation, the equipment has had almost no malfunctions, and the energy-saving effect is significant, saving about 25% more electricity than expected. Our next plan is to transfer the heat treatment of all sensitive metal parts to this equipment."

— Production Manager, Shandong Electrical Appliance Company

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