Precision Casting Mold Ejector Pin

Product Specifications

Technical details and manufacturing context for Precision Casting Mold Ejector Pin

Definition

A precision-engineered cylindrical component used in metal casting molds to forcibly eject solidified castings from mold cavities. These pins are critical for automated foundry production lines, ensuring consistent part release without damage to delicate castings. They withstand extreme thermal cycling and mechanical stress during repeated casting cycles. Proper ejector pin design prevents casting defects and maintains dimensional accuracy in high-volume manufacturing. The pin is typically made from hot-work tool steels such as H13 or SKD61, or tungsten carbide for enhanced wear resistance. Available diameters range from 1.0 to 25.0 mm, with lengths from 50 to 400 mm, conforming to ISO 6751. Surface hardness is specified at 58–62 HRC per ISO 18265, and straightness tolerance is 0.01 mm/m per ISO 1101. Thermal conductivity ranges from 25 to 50 W/m·K (ASTM E1225), and surface finish is Ra 0.2–0.4 (ISO 1302). Material grades include H13, SKD61, and 4Cr5MoSiV1 (ASTM A681). Operating temperature range is -40 to 600°C, with tensile strength of 1200–1500 MPa (ASTM E8) and impact toughness of 20–40 J (ISO 148-1). Optional corrosion-resistant coating provides 72 hours salt spray resistance (ASTM B117). Weight varies from 0.01 to 2.5 kg depending on dimensions. These pins are used in die casting, injection molding, and other foundry processes. They are installed in ejector systems and actuated by hydraulic or mechanical force. Selection requires consideration of casting material, ejection force, cycle time, and operating temperature. Verification of model-specific values and standards with the legal manufacturer or supplier is essential.

Working Principle

Hydraulic or mechanical force pushes the pin through the mold, contacting the casting surface to dislodge it from the cavity after solidification. The pin moves axially within a guide bushing, transferring force to the casting. As the mold opens, the ejector plate advances, driving the pins forward. The pin tip presses against the casting, breaking any adhesion and pushing it out. After ejection, the pins retract for the next cycle. The design must account for thermal expansion, friction, and wear. Proper pin placement and force distribution prevent deformation or damage to the casting. The pin's surface finish and hardness reduce friction and wear. Cooling channels may be integrated to manage thermal cycling. The working principle relies on precise timing and alignment to ensure reliable ejection without sticking or distortion.

Common Materials

H13 Tool Steel, SKD61 Alloy Steel, Tungsten Carbide

Technical Parameters

Parameter	Typical range	Notes & selection driver
Pin DiameterRequired	1.0–25.0 mm	Nominal diameter with manufacturing toleranceISO 6751
Pin LengthRequired	50–400 mm	Total working length from head to tipISO 6751
Surface HardnessRequired	58–62 HRC	Rockwell C scale hardness for wear resistanceISO 18265
Straightness ToleranceRequired	0.01/100 mm/m	Maximum deviation from perfect straightnessISO 1101
Thermal Conductivity	25–50 W/m·K	Heat transfer coefficient for thermal cyclingASTM E1225
Surface Finish	Ra 0.2–0.4 Ra	Surface roughness average for smooth ejectionISO 1302
Material Grade	H13, SKD61, 4Cr5MoSiV1	Hot-work tool steel; alternative grades available.ASTM A681
Operating Temperature	-40–600 °C	Continuous service; above 600°C reduces hardness.
Tensile Strength	1200–1500 MPa	After heat treatment; ensures resistance to bending.ASTM E8
Impact Toughness	20–40 J	Charpy V-notch; prevents fracture under shock loads.ISO 148-1
Corrosion Resistance	Salt spray 72 h	Optional coating; standard pins not corrosion-resistant.ASTM B117
Weight	0.01–2.5 kg	Depends on dimensions; approximate per piece.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Pin Shaft Part
Main cylindrical body that contacts casting

Material: Tool steel or alloy steel
Head Part
Retention feature that prevents pin from falling through mold

Material: Same as shaft material
Tip Part
Contact surface that interfaces with casting

Material: Hardened steel or carbide
Cooling Channel Optional Part
Internal passage for coolant circulation

Material: Integrated into shaft

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Precision Casting Mold Ejector Pin.

Manufacturers of Precision Casting Mold Ejector Pin

Manufacturer profiles associated with Precision Casting Mold Ejector Pin.

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Frequently Asked Questions

What materials are available for ejector pins?

Common materials include H13 tool steel, SKD61 alloy steel, and tungsten carbide. Material grade options are H13, SKD61, and 4Cr5MoSiV1 per ASTM A681. The choice depends on the casting temperature, wear resistance, and cost requirements.

What are the standard dimensions?

Pin diameter ranges from 1.0 to 25.0 mm, and length from 50 to 400 mm, per ISO 6751. These are reference ranges; exact dimensions must be confirmed for the specific application.

How is surface hardness specified?

Surface hardness is typically 58–62 HRC, measured per ISO 18265. This hardness provides wear resistance during ejection cycles.

What is the operating temperature range?

The continuous operating temperature range is -40 to 600°C. Above 600°C, hardness may decrease. Verify the actual limits with the supplier for your process.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Up to 150 MPa (ejection force), 50 MPa (mold clamping)
other spec:	Max ejection stroke: 300 mm, Surface finish: Ra 0.4 μm, Wear resistance: >100k cycles (typical)
temperature:	Ambient to 1200°C (continuous), 1400°C (peak)