Plastic Molding Applications

Transcription

1 Plastic Molding Applications

2 Plastic Injection Molding Comprehensive Product Range Böhler-Uddeholm mold steel grades have been developed specifically to meet the demanding requirements of the plastics molding industry. Our comprehensive mold and holder steel program offers grades specifically designed to resist corrosion and wear, while maintaining a high-level of polishability and ductility. The use of Böhler-Uddeholm mold steel for your core, cavity and component needs ensures that you are using the very best material for consistent and reliable performance. Thermal Conductivity (W/mºC) Uddeholm Elmax SuperClean 18 Uddeholm Corrax Uddeholm Stavax ESR Thermal Conductivity of Selected Plastic Mold Steel at 200ºC/390ºF Uddeholm Mirrax 40 Uddeholm Mirrax ESR 20 Uddeholm Sleipner 23.3 Bohler-Uddeholm D2 BOHLER K294 MICROCLEAN BOHLER S693 MICROCLEAN Bohler-Uddeholm M Uddeholm Ramax Uddeholm Caldie Uddeholm Orvar Superior Uddeholm Vanadis 8 SuperClean 27 Bohler-Uddeholm A2 28 Uddeholm RoyAlloy Bohler-Uddeholm Premium P Uddeholm Compax Supreme / Bohler-Uddeholm S7 Mold Quality Uddeholm Vanadis 4 Extra SuperClean Uddeholm Dievar 31 BOHLER W360 ISOBLOC BOHLER W400 VMR Stainless Steels Prehardened Stainless Steels Prehardened Non Stainless Steels Non Stainless Steels Copper Alloys 35.3 BOHLER M268 VMR 41 Buderus Thruhard Supreme HH** 145 Uddeholm Coolmould HH 160 BeCu Alloy 172 LH ** at 250 C Thermal Conductivity (W/mºC) Mold Steel Thermal Conductivity The cycle time of a mold is dependent, in part, on the ability of the tooling material to transfer heat from the resin to the cooling media. The thermal conductivity of highly alloyed mold steels will be reduced to some degree. However, investigations indicate that it is in fact the plastic resin that dominates the heat transfer, due to its extremely low thermal conductivity relative to the mold steel. Good corrosion resistance is also of importance when the goal is a uniform production rate. The use of a stainless mold steel has the additional benefit of maintaining clear and open cooling channels. This provides for consistent heat transfer from the mold steel to the cooling media. The use of Uddeholm Stavax ESR, Uddeholm Mirrax ESR, Uddeholm Mirrax 40, Uddeholm Corrax, Uddeholm Elmax SuperClean and Uddeholm RoyAlloy will all offer this advantage. A relative comparison of the thermal conductivity characteristics of our mold steel program is shown in the figure above.

3 Stainless Mold Steels Often plastic resins will produce corrosive by-products that degrade the mold steel surface. Operation or storage of mold components, under humid conditions, may also promote corrosive attack. Therefore, Böhler-Uddeholm has developed a series of stainless mold steels that have become an industry standard. Our Uddeholm Stavax ESR is considered the benchmark for customers interested in a modified, type 420 stainless mold steel. For larger, more complex molds, Böhler-Uddeholm offers the Uddeholm Mirrax ESR with superior corrosion resistance and improved ductility. A prehardened version, referred to as Uddeholm Mirrax 40 is also available. For those unique applications that require a combination of corrosion resistance and extreme wearability, we offer the highly-alloyed, powder metallurgical Uddeholm Elmax SuperClean. Uddeholm RoyAlloy, a prehardened, free-machining stainless grade for the holder block portion of the tool, completes our program. Corrosion Resistant, Stainless Mold Steels MIRRAX ESR DUCTILITY MIRRAX 40 CORRAX The size of the sphere corresponds to the relative corrosion resistance STAVAX ESR ELMAX ROYALLOY WEAR RESISTANCE Stainless Mold Steels GRADE DESCRIPTION Uddeholm Stavax ESR 420 modified stainless steel Uddeholm Mirrax ESR 400 series stainless for medium to large molds Uddeholm Mirrax series stainless delivered in the prehardened condition Uddeholm Corrax Precipitation hardening stainless with outstanding corrosion resistance Uddeholm Elmax SuperClean PM stainless steel with an excellent combination of corrosion and wear resistance Uddeholm RoyAlloy Prehardened, free-machining stainless holder material Uddeholm Coolmould HH Prehardened, alloy 172 beryllium copper for high thermal conductivity 40 BeCu Alloy 172 LH Prehardened, alloy 172 beryllium copper for high thermal conductivity 30 WORKING HARDNESS (HRC) ( BHN)

4 Mold Steel Polishability & Texturing Characteristics To ensure that a high-quality surface finish is achievable, it is recommended to use a mold steel that has been electroslag remelted (ESR) or vacuum arc remelted (VMR). These additional refining processes take place during the steelmaking operation at our production mills. These processes remove detrimental micro-inclusions and provide for a very homogeneous microstructure. This will help reach the required surface finish and provide for uniform, consistent texturing. Please refer to our charts for our ESR and VMR-quality mold steels. Filler Metal for Welding Plastic Mold Materials GRADE GTAW/TIG DIAMETER (mm) ELECTRODE / SMAW DIAMETER (mm) Uddeholm Impax 1.0, , 3.2, 4.0 Uddeholm Caldie 1.0, , 3.2 Uddeholm Stavax * 1.0, 1.6 Uddeholm Mirrax 1.0, 1.6 Uddeholm Corrax 1.0, 1.6 BeCu Alloy , 2.4, 3.2 *Available as 0.2, 0.3, 0.4, 0.5 and 0.6 mm diameter for laser and microwelding.

5 Non-Stainless Mold Steels For applications where corrosion resistance is not a factor, Böhler-Uddeholm offers a series of extremely tough, crack-resistant mold steels capable of achieving a lens-quality surface finish. Uddeholm Orvar Superior, along with increasingly tougher grades such as Uddeholm Dievar and BOHLER W400 VMR, provide the mold builder with numerous options within the 44 to 52 HRC hardness range. The BOHLER W360 ISOBLOC and Uddeholm Caldie are capable of reaching higher hardness levels and therefore, offer improved resistance BOHLER W400 VMR to indentation and wear. Both of Uddeholm Dievar these grades are ESR-quality and Conventional Steels are often used as an upgrade from Uddeholm Orvar Superior (PREMIUM H13) ESR/P-ESR/VMR Steels the more conventional H13 or S7 PM Cold Work Tool Steels alloys. When extreme wear BOHLER W360 ISOBLOC resistance is required, the PM High Speed Steels Uddeholm Compax Supreme / powder metallurgical grades BOHLER-UDDEHOLM S7 (MOLD QUALITY) Uddeholm Vanadis 4 Extra Uddeholm Caldie SuperClean, Uddeholm Vanadis Uddeholm Vanadis 4 Extra SuperClean 8 SuperClean and BOHLER Uddeholm Vanadis 8 SuperClean K294 MICROCLEAN. Ductility BOHLER S693/S692 MICROCLEAN Uddeholm Sleipner AISI 01 AISI A2 BOHLER K294 MICROCLEAN (PM A11) AISI M2 AISI D2 Abrasive Wear Resistance Non-Stainless Mold Steels GRADE DESCRIPTION WORKING HARDNESS (HRC) P1-FM Holder Stable, improved machinability holder steel Brinell BOHLER-UDDEHOLM PREMIUM P20 MODIFIED General purpose, prehardened mold steel Brinell BUDERUS EDELSTAHL THRUHARD SUPREME HIGH HARD Prehardened mold steel with improved wear resistance and very high thermal conductivity Brinell Uddeholm Orvar Superior Premium H13, excellent toughness and polishability Uddeholm Dievar Increased toughness (greater than H13) BOHLER W400 VMR Optimal toughness level and polishability Uddeholm Compax Supreme / BOHLER-UDDEHOLM S7 MOLD QUALITY Moderate toughness and wear resistance BOHLER W360 ISOBLOC Higher toughness level than S7 along with better wear characteristics Uddeholm Caldie Very good toughness level and increased wearability Uddeholm Sleipner 8% Chromium tool steel with good toughness and moderate wear resistance Uddeholm Vanadis 4 Extra SuperClean PM - 4% Vanadium, excellent toughness. Excels in mixed wear applications Uddeholm Vanadis 8 SuperClean PM - 8% Vanadium, excellent toughness, extremely high wear resistance, abrasive and adhesive BOHLER K294 MICROCLEAN PM 10% Vanadium, extreme abrasive wear applications

6 PLASTIC MOLDING APPLICATIONS Bohler-Uddeholm Corporation 2505 Millennium Drive, Elgin, IL This information is based on our present state of knowledge and is intended to provide general notes on our products and their uses. It should not therefore be construed as a warranty of specific properties of the products described or a warranty for fitness for a particular purpose. Rev. June 19, 2017 BU-B005 info@bucorp.com (800) MATERIALIZING VISIONS 2016, Bohler-Uddeholm Corporation