Classification of Mold Parts

Based on stamping mold scenarios, this classification covers multiple dimensions: function, wear characteristics, application scenarios, and management attributes. It marks wear frequency and management points to facilitate warehousing, issuing, and inventory counting.

I. Classification by Function (Most Common, Suitable for On-site Assembly/Maintenance)

(A) Guide and Positioning Parts

Function: Ensure mold opening/closing and clamping accuracy, prevent offset and mold damage.

• Guide pillars, guide bushings, guide pillar auxiliary sleeves

• Dowel pins, lifting pins, floating pins, stop pins

• Positioning blocks, limit pins, limit sleeves, stoppers

• Stock guide plates, stock guide pins, side guide plates

Features: High precision required, mostly standard parts; long lifespan under normal use, prone to wear from impact or eccentric load.

(B) Forming and Cutting Edge Parts (Core Functional Parts)

Function: Perform stamping, shearing, bending, drawing, and forming – directly determine product dimensions and appearance.

• Blanking: Punches, dies, insert cutting edges, segmented cutting inserts, cut-off blades

• Bending/Forming: Bending inserts, forming punches, forming dies, radius inserts

• Drawing/Flanging: Drawing punches/dies, flanging inserts, pressure pad inserts

• Shearing: Side cut-off blades, cut-off knives, corner cutting punches

Features: Core parts of the mold; highest wear rate, prone to chipping/wear/fracture; mostly non-standard parts, strict control, issue requires approval.

(C) Stripping and Ejection Parts

Function: Strip material, eject product/strip, prevent jamming and sticking.

• Stripper plate assembly: stripper inserts, stripper bushings

• Ejector pins, ejector plates, ejector rods, ejector blocks

• Springs (rectangular springs, round wire springs, nitrogen gas springs)

• Stripper bolts, height sleeves, ejection sleeves

Features: High-frequency moving parts, main source of consumables; mandatory exchange of old for new.

(D) Cam and Slide Parts (Side-action Mechanisms)

Function: Used in stamping dies with undercuts or side forming/piercing.

• Cam drivers, slide bodies, slide inserts

• Slide wear plates, thrust plates, clamps, gibs

• Slide springs, return pins, limit blocks, slide stops

Features: High friction during movement; wear parts are routine consumables; overall mechanism has long lifespan.

(E) Fastening and Connection Parts

Function: Assembly and fixation of all components – common across molds.

• Socket head cap screws, hex head screws, bolts, nuts

• Washers, spring washers, flat washers, lock washers

• Shoulder bolts, height bolts, tie rods

Features: Common standard small parts, high volume, low unit cost; maintain regular safety stock.

(F) Auxiliary, Protection and Accessory Parts

Function: Mold protection, lifting, lubrication, identification, insulation, etc.

• Lifting: Lifting rings, lifting lugs, lifting bolts

• Lubrication/Cooling: Grease nipples, oil pipes, oil cups, dust covers

• Protection: Dust plates, protective covers, insulation plates

• Others: Mold nameplates, identification tags, mold clamps, bumpers

II. Classification by Wear Frequency & Management Attributes (Warehouse + Cost Control)

1. High-frequency consumables: Springs, ejector pins, lifting pins, dowel pins, small punches, small inserts, screws, washers, wear plates, stripper bushings.
   → High consumption, set safety stock, regular issue, mandatory exchange old for new.

2. Medium-frequency wear parts: Guide pillars/bushings, limit pins, positioning blocks, stock guide parts, standard ejector assemblies.
   → Periodic replacement, purchase according to maintenance schedule.

3. Low-frequency core parts: Large punches/dies, monolithic cutting edges, bending/forming inserts, slide bodies, cam drivers, pressure pad inserts.
   → Rarely replaced, purchase as needed (no stocking), issue requires approval.

4. Standard common parts: Guide pillars/bushings, springs, screws, dowel pins, lifting rings, limit pins, standard ejector pins.
   → Readily available in market, uniform specifications, can be shared across multiple molds.

5. Custom non-standard parts: Shaped punches, special inserts, non-standard cutting edges, custom forming blocks, special slide inserts.
   → Dedicated to a single mold, not interchangeable; machined per mold drawing.

6. Repairable/reusable parts: Slightly worn cutting edges, deformed ejector rods, scored bushings, slightly damaged inserts.
   → Can be ground, welded, corrected, and reused after repair; store separately in a dedicated area.

7. Scrap parts: Broken, severely chipped, deformed, or out-of-tolerance components.
   → Isolate in a separate area, prohibit reuse; dispose of regularly.

III. Classification by Storage/Form (5S Warehouse Arrangement)

1. Small loose parts (screws, nuts, washers, small dowel pins) → Store in compartmentalized parts bins.

2. Long rod-type parts (ejector pins, guide pillars, long dowels) → Store vertically to prevent bending.

3. Plate/block-type parts (inserts, limit blocks, stoppers, wear plates) → Store flat on shelving.

4. Springs → Segregate by outer diameter, wire diameter, and color code; store in separate boxes.

5. Precision cutting edge parts (punches, dies, cutting edges) → Store individually in boxes, apply anti-rust oil, protect against impact.

6. Large mechanism parts (slides, cam drivers, large inserts) → Store on bottom shelving, prevent tipping.

IV. Quick Reference Table (Can be used as warehouse identification signs)