Overview
Sample mold round bars are cylindrical tooling components designed for prototyping and small-batch production in manufacturing. They serve as cores or inserts in molds to create precise circular features in plastic, metal, or composite parts. These bars are critical in industries requiring rapid sample validation before mass production. Manufacturers typically produce them from tool steels like H13 for thermal resistance or carbides for extended wear life. Their dimensional tolerances often meet ISO h6/h7 standards, ensuring compatibility with industrial mold bases. The bars may feature ground or polished surfaces (Ra ≤ 0.8μm) to facilitate part ejection.
Structure and Working Principle
A standard sample mold round bar consists of a precisely machined cylindrical shaft with optional mounting features like threads or flanges at one end. The working end maintains tight diameter tolerances (typically ±0.01mm) to form accurate mold cavities. During operation, the bar is press-fit or bolted into mold plates. In injection molding, it withstands melt pressures up to 150MPa while maintaining circularity. Some designs incorporate cooling channels to regulate temperature during high-cycle operations. The bars may also include ejection sleeves for automated part removal in production environments.
Key Features
High-performance sample mold round bars offer several distinguishing characteristics. Material selection prioritizes hardness (58–62 HRC for steel variants) coupled with toughness to resist cracking under cyclic loading. Premium grades feature through-hardening to ensure uniform properties across the cross-section. Surface treatments like nitriding or TiN coating enhance wear resistance, extending service life in abrasive applications. Thermal stabilization processes minimize distortion during heat cycles. Some manufacturers provide anti-stick coatings (e.g., PTFE-impregnated) for challenging polymer releases. Dimensional stability is maintained across operating temperatures up to 300°C for hot-runner systems.
Application Areas
These components are indispensable in multiple industrial sectors. In automotive prototyping, they create precise guide holes for interior components. Electronics manufacturers use them to form connector housings during design validation. Medical device producers rely on them for sterile packaging trial runs. Beyond plastics, the bars serve in die casting for aluminum prototype gears and in rubber molding for sealing element development. Specialized versions with ultra-fine finishes (Mirror Class A1) are employed for optical lens sampling. The aerospace sector often specifies corrosion-resistant variants for composite material tooling.
Maintenance and Precautions
Proper care extends the service life of sample mold round bars. After each use, clean with non-abrasive solvents to remove resin residues or metal buildup. Periodic inspection should check for diameter wear using micrometer measurements at multiple points along the length. Storage requires VCI (volatile corrosion inhibitor) paper wrapping in climate-controlled environments. Avoid stacking unprotected bars to prevent surface damage. For coated variants, use pH-neutral cleaners to preserve surface treatments. Reconditioning through regrinding is possible for steel bars with wear under 0.05mm, though carbide versions typically require replacement.
B2B Procurement Guide
When sourcing sample mold round bars, prioritize suppliers with ISO 9001-certified tool room capabilities. Key specifications to confirm include: material certification (e.g., Uddeholm AISI H13), straightness tolerance (≤0.01mm/100mm), and surface finish requirements. For high-volume applications, consider vendors offering PVD coating services in-house. Lead times vary from stock items (3–5 days) to custom geometries (2–4 weeks). Request samples for dimensional verification before bulk orders. Many manufacturers provide CAD models for integration with mold design software. For international procurement, verify compliance with regional standards like DIN (Germany) or JIS (Japan) where applicable.
Related Manufacturers
- 主营：电镀锌、热镀锌、电工钢、镀铝锌、汽车钢、冷轧板、热轧酸洗板卷
- 主营：抓斗、炉底板、落煤管、圆棒、离心铸管、垫铁炉枕、吊具、料框、料盘、坩埚、滑块、高铬铸板、炉辊、溜渣槽、钢板、无缝管
- 主营：温合金、固溶车、镍钛鑫、圆棒板、钼合金、尔合金、无缝管、传感器、时效钢、无缝棒、中厚板、冷轧板、镍合金、合金板、合金棒、锆合金、铜合金、金锻件、钛合金、棒板管、母合金、纯镍板、圆管板、磁合金、钢板材
- 主营：sa675gr70、f11圆钢、f92圆钢、HC22圆棒、f51圆钢、f91圆钢、34crnimo6、60si2crva、30crmntih、20crnimoa、b16圆钢、20crmnmoa、25#圆钢、30crnimo8、17crnimo6、h13圆钢、f53圆钢、f52圆钢、30crmnsia、40crmnmoa、f55圆钢、a36圆钢、f22圆钢、20crni2mo、f60圆钢、35crmnsia
- 主营：空心管、黄铜棒、弹簧钢、轴承钢圆棒、铬锆铜、铝合金、红铜带、磷铜管、黄铜管、白铜带、锆铜板、紫铜带、钛卷带、铍青铜、合金钢、铬青铜、紫铜卷、磷铜板、磷铜带、黄铜板、紫铜棒、冷拉棒、纯钛板、紫铜板、雕刻板、铍铜带
- 主营：高温合金钢板 圆棒、镍基合金钢管
- 主营：马氏体时效钢、哈氏合金、纯镍合金、329圆棒、圆棒材、光圆棒、400圆棒、718圆棒、钛合金、不锈钢丝、黑皮板、轧板材、718锻板、合金丝、研磨棒、光亮棒、电渣料、无缝管、718圆钢、双相钢、合金板、630棒材、318圆钢、440锻棒
- 主营：耐热钢铸件
- 主营：白铜系列产品、镍基合金产品、哈氏合金产品、圆棒、高温合金产品
- 主营：无缝管、镍基合金、合金圆钢、耐热钢、高温合金、铜镍合金、C70600
- 主营：无缝管、c22钢板、inconel625、圆棒切割、光亮圆棒、不锈钢圆棒、不锈钢板、钢板检测、哈氏合金、钢板切割、弯头标准、无缝钢管、合金b3钢板、不锈钢锻造、耐高温钢板、高温合金钢板、合金钢管工艺、钢板固溶时效、镍基合金钢板、带颈对焊法兰、耐高温合金板、对焊法兰标准、合金光亮圆钢、钢耐高温铸件、合金钢板复合
- 主营：铜镍合金、镍基合金、哈氏合金、高温合金、蒙乃尔合金
- 主营：密封球、铣刀棒料、钝化滚珠、硬质合金圆棒、钨钢毛坯圆棒、钨钢圆棒铣刀、钨钢单孔棒、机械密封环、硬质合金圆柱、钨钢拉伸模具
- 主营：22锻造合金圆棒、不锈钢板、不锈钢管、不锈钢圆钢
- 主营：600钢板、f51钢板、inconel600、inconel625、合金c276、不锈钢板、钢板镍基、incoloy800ht、00cr22ni5mo3n