Protects the rotor body
Rotor caps absorb the wear that would otherwise reach the rotor itself, the costliest part in the mill.
Shredder Wear Parts
Shredder Anvils & Rotor Caps
Anvils that take the hammer strike and rotor caps that protect the rotor body between hammer positions.
Overview
About shredder anvils & rotor caps
The anvil is the fixed surface a shredder hammer drives material against, and it absorbs the same energy the hammer does. Rotor caps sit between hammer positions and protect the rotor body itself, the one component in the mill that is genuinely expensive to replace.
Melco casts both in austenitic manganese steel and, where abrasion dominates, in high chrome. The choice follows the same logic as blow bars: manganese where impact and tramp metal dominate, high chrome where the wear is abrasive and steady.
Rotor caps in particular are cheap insurance. Allowing them to wear through exposes the rotor body to direct impact, which turns a routine wear part change into a major rebuild.
Applications
- Automobile and scrap shredder anvils
- Rotor cap protection between hammer positions
- VSI crusher anvils and impact surfaces
- Hammer mill breaker plates and impact surfaces
Features
What you get
Manganese or high chrome
Grade selected for whether your failure mode is impact damage or steady abrasion.
Cast to existing geometry
Produced from your drawing or a sample so caps seat correctly and the gap setting is preserved.
Supplied with hammers as a package
Anvils, caps, grates and hammers from one schedule, so a full change-out arrives together.
Specifications
Manufacturing specification
Applies to shredder anvils & rotor caps produced at our works. Castings outside this range can usually be accommodated, so please ask.
| Moulding | No-bake resin sand and green sand |
|---|---|
| Melting | Induction furnace, spectrometer-controlled |
| Piece weight | 5 kg – 2,000 kg |
| Heat treatment | In-house, computer-controlled cycles |
| Dimensional control | Template and CMM check against drawing |
| Documentation | Chemical, hardness and dimensional report per heat |
Material grades
| Grade | Typical composition | Hardness | Suited to |
|---|---|---|---|
| ASTM A128 Grade A | 1.05–1.35% C, 11.0–14.0% Mn | 200–229 BHN as-cast, 500+ BHN work-hardened | Standard high-impact duty |
| ASTM A128 Grade B-3 | 0.9–1.05% C, 11.5–14.0% Mn | 200–229 BHN as-cast, 500+ BHN work-hardened | Heavier sections, improved toughness |
| ASTM A532 Cl. II Type B (15Cr-3Mo) | 14–18% Cr, 2.5–3.5% Mo, 2.4–3.0% C | 58–64 HRC | General high-abrasion impact crushing |
| ASTM A532 Cl. II Type D (20Cr-Mo) | 18–23% Cr, 1.5% Mo max, 2.0–3.3% C | 58–63 HRC | Abrasive limestone and secondary duty |
Composition ranges are quoted against the published standard. Actual analysis for your heat is issued with the castings.
Gallery
From our works
-
Anvils and rotor caps after machining of the seating faces. -
Grate sections: opening pattern cast to the customer product spec. -
Export packing: palletised, strapped and heat-number marked.
Questions
Shredder Anvils & Rotor Caps: common questions
How does anvil wear affect shredder performance?
The gap between hammer and anvil sets how effectively material is broken. As the anvil wears the gap opens, throughput drops and product size drifts coarser, often before anyone identifies the anvil as the cause.
Why replace rotor caps if they still have metal left?
Because the cost of being wrong is disproportionate. Once a cap wears through, impact reaches the rotor body directly, and rotor repair means extended downtime and a far larger bill than a set of caps.
Can you supply anvils for VSI crushers as well?
Yes. Vertical shaft impactor anvils are cast in the same alloy families, typically high chrome where the feed is abrasive and manganese where impact dominates.
More from our range
Related products
Enquiry
Enquire about shredder anvils & rotor caps
Tell us the machine, the feed and the quantity. If you have a drawing or photographs of the worn part, mention it and we will send an upload link.
Melco Castings is an independent manufacturer of replacement wear parts. Machine and OEM names are used only to identify the equipment our castings fit. We are not affiliated with, endorsed by, or a distributor for any of these manufacturers.