Polish carbide tool manufacturer purchases heat-insulated vacuum furnaces for tungsten carbide sintering.

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Polish carbide tool manufacturer purchases heat-insulated vacuum furnaces for tungsten carbide sintering.

1. Client Introduction

Client Name: SEGER Cutting Tools (Poland's leading manufacturer of carbide cutting tools)

Industry: Carbide tool manufacturing, metal cutting

Core Needs: To achieve high-density vacuum sintering of high-quality tungsten carbide (WC-Co) based carbide inserts and milling tools, ensuring excellent hardness, bending strength, and wear resistance to meet the stringent requirements of the European automotive, aerospace, and general machining markets for high-performance cutting tools.

SEGER Cutting Tools is one of Poland's largest manufacturers of carbide cutting tools, a comprehensive enterprise integrating design, manufacturing, and tool services, specializing in the production of solid sintered carbide tools, welded indexable inserts, and combination tools. The company has achieved extremely high technical levels in terms of shape complexity and manufacturing tolerances, and its products are exported to many industrialized countries in Europe. With the Polish carbide market continuing to expand at a CAGR of over 5.6%, and the increasing demand for high-precision machining tools in European manufacturing, SEGER plans to expand its production capacity of high-end carbide products and enhance its independent control over sintering processes.

Previously, SEGER outsourced some sintering processes to external heat treatment service providers, but this resulted in drawbacks such as uncontrollable delivery times, difficulty in optimizing process parameters, and insufficient confidentiality of core formulas. Therefore, the company decided to introduce a small vacuum sintering furnace capable of completing the entire process of dewaxing, sintering, and cooling in a high-vacuum environment for the in-house production of mid-to-high-end cutting tools.

2. Equipment Introduction

Equipment Name: Insulated Vacuum Furnace

Product Model: PT-V1400-64L

Working Area Dimensions: 400×400×400mm, suitable for sintering requirements of small to medium batches of cemented carbide products;

Maximum Temperature: 1400℃ / Continuous Working Temperature ≤1300℃;

Heating Element: Molybdenum belt heating, high temperature resistance, oxidation resistance, uniform heating;

Furnace Structure: Double-layer steel structure furnace shell with built-in water-cooled jacket; furnace door interior is mirror-polished stainless steel; furnace shell is made of high-strength carbon steel with electrostatic spraying treatment;

Vacuum System: Two-stage vacuum system of oil diffusion pump + rotary vane mechanical pump; furnace ultimate vacuum can reach 6.67×10⁻³ **Sealing Method:** Ground chamber seal, ensuring a stable and reliable sealing interface, protected by a water-cooling system.
Temperature Control System: 7-inch touchscreen, PID automatic control, SCR power adjustment, 30-segment programmable time-temperature curve, dual alarms for over-temperature and deviation.
Insulation Material: New furnace lining material, low power consumption, energy-saving and environmentally friendly.
Protection Functions: Over-temperature alarm, thermocouple breakage protection, water pressure undercurrent protection, vacuum pump interlock.

This equipment is specifically designed for vacuum heat treatment, vacuum sintering, vacuum brazing, and vacuum annealing processes for materials such as cemented carbide, high-speed steel, ceramic materials, magnetic materials, and titanium alloys. It can complete the entire process from dewaxing and degassing to high-temperature sintering under high vacuum conditions, ensuring excellent densification and microstructure in cemented carbide products. The compact 400×400×400mm furnace chamber design meets the efficiency requirements of small-batch production while also allowing for flexibility in laboratory-level process development.

3. Equipment Application

Specific Process: Vacuum sintering of tungsten carbide-based cemented carbide (WC-Co)

Processed Material: WC-Co mixed powder compacts

Product Type: Solid cemented carbide end mills, indexable inserts, drills, and special forming tools

Process Objective: To densify WC-Co compacts through vacuum sintering, forming cemented carbide products with high hardness, high bending strength, and uniform microstructure. Sintering in a vacuum environment effectively avoids oxidation and decarburization of tungsten carbide at high temperatures, while utilizing the good wettability of the cobalt binder phase to achieve tight bonding between tungsten carbide particles.

Specific Contributions of the Equipment to Customer Production:

Process Integration: Completes dewaxing, degassing, high-temperature sintering, and partial pressure sintering in the same batch, significantly shortening the production cycle and reducing the risk of contamination from material transfer.

High Vacuum Degree: Ultimate vacuum degree of 6.67 × 10⁻³ Pa, ensuring that tungsten carbide is not oxidized during high-temperature sintering. The sintered product surface is bright silver, requiring no subsequent cleaning process.

Uniform Temperature Field: The molybdenum belt heating element, combined with a new furnace lining material, ensures excellent furnace temperature uniformity. Performance differences between blades in different locations within the furnace after sintering are controlled within ±2%.

Cobalt Volatilization Control: The partial pressure sintering function, using high-purity argon gas at temperatures above 1300℃ and a pressure of 50-100 Pa, effectively suppresses the volatilization loss of the cobalt binder phase, ensuring accurate alloy composition.

Significant Energy Saving: The low heat capacity design of the furnace lining material, combined with efficient water-cooled jacket insulation, reduces operating energy consumption by approximately 25% compared to traditional refractory brick furnaces.

Matching Capacity and Flexibility: The 400×400×400mm furnace can process 200-300 standard blades per batch, perfectly suited to customers' "small batch, multi-variety" production model.

4. Customer Feedback

*“We have been looking for a furnace capable of stably sintering tungsten carbide cutting tools in a vacuum environment, but the investment in large industrial vacuum furnaces on the market is too high, while ordinary tube furnaces cannot meet the needs of mass production. Your company's heat-shielded vacuum furnace PT-V1400-64L perfectly addresses our pain points—the furnace chamber size of 400×400×400mm is just right, which can meet our small-batch production of mid-to-high-end cutting tools without causing idle capacity. What we are most satisfied with is the vacuum system. The ultimate vacuum of 6.67×10⁻³ Pa ensures that the tungsten carbide does not oxidize or discolor after high-temperature sintering at 1410℃, and the tool surface exhibits a uniform metallic luster, with excellent cutting performance. The pressure-partial sintering function is also crucial. In the past, when we outsourced sintering, we occasionally encountered the problem of uneven distribution of the cobalt binder phase. Now, with in-house control, the hardness fluctuation of each batch is controlled within HRA.” Within 0.5 mm. The equipment has a touchscreen interface, making programming intuitive; our process engineers mastered it in just two days. It has been running stably for over a year since delivery without any malfunctions, and the molybdenum strip heating elements remain in excellent condition. This furnace has become a core piece of equipment in our high-end cemented carbide product line, and we will continue to procure more in the future. *

— Mr. Tomasz Kowalski, Technical Director, SEGER Cutting Tools

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Polish carbide tool manufacturer purchases heat-insulated vacuum furnaces for tungsten carbide sintering.

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