Core and cavity inserts contain locating holes, dowel holes, mounting holes, threaded-hole preparation, blind holes, cooling passages, vent holes, stepped holes, flat-bottom features, and small precision holes.
These components are commonly manufactured from pre-hardened mold steel, hardened tool steel, stainless mold steel, copper alloys, or aluminum tooling materials. Their high hardness, compact dimensions, contoured surfaces, limited entry areas, tight tolerances, and internal cooling structures increase the risk of drill walking, cutting-edge wear, chip packing, hole deviation, and inconsistent blind-hole depth.
Landun CNC Tool supports drill selection and custom carbide drill development based on the insert drawing, workpiece material, hardness, hole diameter and depth, entry surface, tolerance, coolant method, and current machining problem.
MACHINING CHALLENGE
Core inserts, cavity inserts, wear inserts, and hardened insert blocks can cause rapid flank wear, cutting-edge chipping, rising cutting forces, unstable hole diameter, or inconsistent tool life.
High material hardness, alloy content, local hardness variation, cutting heat, insufficient coolant delivery, and unsuitable edge preparation can accelerate coating wear and weaken the cutting edge.
Wear-resistant coatings, controlled edge preparation, stable drill-point geometry, and suitable carbide grades help improve cutting-edge strength and tool-life consistency. Drill geometry should be selected according to material hardness, hole depth, coolant conditions, and machine rigidity.
Locating holes, cooling holes, mounting holes, and threaded-hole preparation may begin on angled faces, curved surfaces, drafted walls, narrow bosses, or partially machined insert features.
Uneven initial contact creates unbalanced cutting forces. Excessive tool overhang, high spindle runout, insufficient workholding rigidity, or unsuitable point geometry can cause drill walking, deflection, or cutting-edge damage.
A short and rigid spotting operation, low-runout toolholding, stable clamping, and suitable drill-point geometry help improve entry position. Flat-bottom or drawing-based custom drills may be more suitable for strongly angled or interrupted entry conditions.
Core and cavity inserts often contain blind mounting holes, threaded-hole preparation, spring-related holes, plug holes, and shallow precision features requiring controlled depth and bottom geometry.
Drill-point allowance, chips remaining at the hole bottom, unstable feed, repeated tool changes, and accumulated positioning errors can affect effective hole depth, bottom shape, and shoulder position.
Stable drill geometry, controlled feed, effective chip evacuation, and accurate working-length control help improve blind-hole consistency. Flat-bottom, step, and combination drills can reduce secondary operations and provide more direct control of the finished feature.
Vent holes, small cooling holes, lubrication holes, fine locating features, and compact insert details may experience drill deflection, chip packing, unstable hole diameter, poor straightness, or micro-drill breakage.
Small-diameter carbide drills are sensitive to spindle runout, excessive overhang, unstable entry, limited flute capacity, and insufficient coolant delivery. Hardened materials further increase cutting load and edge wear.
Low-runout toolholding, short overhang, stable point geometry, controlled drilling parameters, and suitable flute design help improve micro-hole stability. Through-tool coolant or controlled drilling cycles may be used when deeper small holes require more reliable chip evacuation.
Core and cavity inserts may contain straight cooling holes, angled channels, intersecting passages, cross holes, inlet and outlet features, and small water passages that must connect accurately.
High depth-to-diameter ratios, inaccurate entry position, excessive runout, unstable coolant pressure, drill deviation, and sudden breakthrough into another passage can cause misalignment, internal burrs, trapped chips, or failed passage intersections.
Accurate pilot-hole preparation, low runout, stable machine rigidity, through-tool coolant, and controlled breakthrough parameters help improve passage position and chip evacuation. Custom drill geometry can be developed according to the channel angle, wall thickness, and intersection condition.
Common drilling applications include locating holes, dowel holes, mounting holes, threaded-hole preparation, blind holes, cooling holes, and repeated precision features in pre-hardened or hardened mold steel.
Typical features include locating holes, assembly holes, mounting holes, threaded-hole preparation, small cooling passages, vent holes, stepped holes, and close-tolerance blind features.
Common applications include pin holes, locating holes, mounting holes, lubrication holes, threaded-hole preparation, blind holes, and small precision features in hardened tool steel and wear-resistant insert materials.
Typical applications include straight cooling channels, angled water holes, intersecting passages, vent holes, plug-hole preparation, locating features, and combined drilling-and-chamfering operations.
For locating holes, mounting holes, dowel holes, threaded-hole preparation, blind holes, and general drilling in core inserts, cavity inserts, and hardened mold blocks.
For vent holes, small cooling holes, lubrication holes, fine locating features, compact mold details, and other small-diameter precision applications.
For long cooling channels, angled water passages, deep insert holes, and high depth-to-diameter drilling in thick core and cavity inserts.
For angled entry, stepped holes, flat-bottom holes, combined diameters, drilling and chamfering, special lengths, and drawing-based non-standard insert features.
| INFORMATION | WHY IT MATTERS |
|---|---|
| Core or cavity insert drawing | Confirms hole positions, cooling-channel layout, angled entry, step features, tolerances, and special requirements. |
| Workpiece material and hardness | Helps determine carbide grade, point geometry, edge preparation, coating, and cutting parameters. |
| Insert dimensions and available clamping area | Helps evaluate workholding stability, tool access, vibration risk, and allowable tool overhang. |
| Hole diameter, depth, and type | Defines drill size, working length, depth-to-diameter ratio, and blind-, through-, micro-, or flat-bottom-hole requirements. |
| Entry surface and drilling angle | Helps assess drill walking, point loading, spotting requirements, and the need for custom entry geometry. |
| Passage intersections and wall thickness | Helps evaluate breakthrough stability, internal burr risk, passage alignment, and remaining material strength. |
| Tolerance, straightness, and bottom requirements | Helps determine drill selection, runout control, depth control, and inspection requirements. |
| Machine, holder, coolant, and current problem | Helps evaluate rigidity, coolant delivery, chip evacuation, tool wear, breakage, and production targets. |
Review the component drawing, workpiece material, hole structure, machine conditions, and current drilling problem.
Select a suitable standard drill series or develop a custom drill based on hole depth, tolerance, entry conditions, and machining requirements.
Produce the drill with controlled geometry, edge preparation, coating selection, and multi-stage inspection to support consistent quality.
Support sample testing, specification confirmation, and stable repeat production after the drill solution is approved.
Walter 5-axis grinding supports stable drill-point geometry, flute consistency, diameter accuracy, and shank concentricity.
Controlled edge preparation helps improve cutting-edge consistency, coating adhesion, wear resistance, and tool-life stability.
Coating selection is matched to the workpiece material and drilling conditions to improve wear resistance, heat control, and cutting stability.
HELICHECK PLUS and 150× / 300× visual inspection help verify dimensions, cutting edges, coating appearance, and overall tool condition.
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