D Shape HSS punches are precision high-speed-steel press-tool punches whose exact meaning must be defined by drawing. The term may describe a flat-sided D cutting profile or a recognised punch form. Vardhman lists M2, M35 and M42, 50–100 mm and custom lengths, 64 ± 2 HRC, MOQ of 25 pieces and India/export supply.
A D Shape HSS punch is a high-speed-steel press-tool punch whose exact form must be defined by drawing or standard. The term may describe a round cutting profile with one flat side, or a recognised punch body/head form. Buyers should not order from the name alone.
The press drives the HSS cutting profile into a matching die opening. The sheet first deforms and shears, then fractures to release a slug. If the cutting profile has a flat side, orientation must remain aligned throughout the stroke so clearance is consistent around the complete perimeter.
A D-profile normally combines a curved portion with one flat side, while a square punch has four straight sides and a block punch may use any custom profile. Each shape requires a matching die opening, shape-specific dimensions, corner or transition radii and orientation control.
The live page lists HSS M2, M35 and M42. Buyers should request the exact grade and heat-treatment certificate for the quoted punch. Grade selection depends on wear, toughness, hot hardness, profile size, flat transition, sheet material, production volume and expected shock.
The page does not state DIN 9861 or ISO 6752 compliance. FIBRO lists an HSS punch identified as DIN 9861 Shape D / ISO 6752, but that does not prove Vardhman's product follows the same standard. Request a standard declaration and dimension drawing before specifying compliance.
A suitable treatment or coating can reduce friction, galling and abrasive wear in selected applications. It must match the HSS grade, heat treatment, sheet material, lubricant, profile geometry and failure mode. Coating cannot correct poor orientation, clearance or mounting.
HSS generally offers a useful balance of toughness, grindability and wear resistance for shaped profiles. Carbide can provide greater wear resistance but is more sensitive to shock, bending, rotation and sharp transitions. The profile, support, carbide grade and volume must justify the choice.
Replace it when cracked, rotated, bent, severely chipped, below minimum usable length, outside profile or angular tolerance, or repeatedly failing because of unsuitable material or design. Inspect the retainer, guide, stripper and die before fitting the replacement.
M2 is a widely used HSS grade offering a practical balance of wear resistance, toughness, grindability and cost. It can suit general shaped-punch applications where profile transitions, clearance, guidance and impact are well controlled. Final suitability depends on the sheet material and heat treatment.
The live Vardhman page does not clarify this. A D-flat cutting profile needs diameter, flat or chord dimension and orientation. DIN 9861 Shape D / ISO 6752 is a standard punch-form designation with its own dimensional structure. The quotation must identify which interpretation applies.
Cobalt-bearing M35 and M42 may be considered where hot hardness and wear demands exceed those of general-purpose M2. A narrow flat transition, small point or shock loading still requires adequate toughness. Select the grade from actual material, thickness, volume and failure mode.
Diameter alone cannot define a D-profile because different flat positions create different shapes from the same circle diameter. The page should publish the flat or chord dimension, centre offset, transition radii and orientation. If Shape D refers to a standard body form, the applicable standard dimensions must be shown instead.
The drawing may specify chord length, distance from the circle centre to the flat, remaining height across the profile or a recognised shape code. Use one unambiguous method, include tolerances and show the reflected or working view so the die opening is not manufactured as a mirror image.
A non-round D-profile must align with the matching die opening. Angular error changes local clearance and can cause burr, side load, galling, chipping or breakage. The drawing should define the orientation datum, viewed direction, key, flat or dowel location and allowable angular tolerance.
Shaped punch drawings often use a defined plan or reflected view to prevent mirror-image errors between the punch, guide and die opening. The drawing should state the viewing direction clearly and show the orientation feature. Do not rely on an unlabelled sketch or verbal description of the flat position.
Then the cutting point may still be round, and the key selection data become the applicable DIN or ISO form, shank diameter, head diameter or shape, head height, overall length, point diameter and fit. The product page should state this explicitly to avoid targeting the wrong buyer intent.
The page states 64 ± 2 HRC. This should be confirmed for the exact M2, M35 or M42 grade and heat-treatment route. If the punch is headed or has a high-stress orientation feature, point, shaft and head hardness may need separate acceptance values.
Not always. The cutting profile needs wear resistance, while the head, flange or locking feature may require greater toughness. The correct hardness distribution depends on the punch form and manufacturing process. Request hardness test locations and allowable values on the approved drawing.
The live page does not identify whether the value is Ra, Rz or another parameter or which surface it covers. A D Shape punch needs finish requirements for the cutting profile, flat, relief, shank and guided surfaces. An unidentified micron range is incomplete.
The curved profile, flat and shank must be located relative to the mounting axis and orientation datum. Position error creates uneven clearance, side load, asymmetric wear and a shifted hole profile. The inspection plan should include profile location, runout and angular orientation.
The two transition points can concentrate cutting stress and are sensitive to clearance and grinding quality. A controlled radius or broken corner may reduce chipping, but it changes the pierced profile. The punch and die must use compatible corner geometry and the part drawing must allow it.
Clearance depends on sheet material, thickness, strength, required edge quality and tool-life target. It must be applied consistently around the curved and flat portions, including transition areas. One universal percentage should not be used without validating the actual work material and profile.
Local tight clearance can increase cutting and stripping force, heat, secondary shear, chipping, galling and side load. Transition points may fail first. Measure the punch profile, matching die opening, orientation and alignment before changing the nominal clearance.
Excessive clearance can increase rollover, burr, taper, flat-edge distortion and profile inaccuracy. The flat may appear shifted or poorly defined. Acceptable clearance depends on the part function, burr direction, downstream operation and balance between hole quality and tool life.
A shifted flat can result from punch rotation, incorrect drawing view, angular mounting error, profile grinding error, die mismatch, guide wear or press deflection. Check the orientation datum and inspect both punch and die before changing the flat dimension.
Unequal burr normally indicates non-uniform clearance, angular misalignment, worn guides, profile mismatch, chipped transitions or press deflection. Compare burr around the curved side, flat and both transition points. Replacing only the punch will not solve a die-alignment problem.
Yes. A non-round slug can rotate, wedge or bridge if die relief, clearance, chute geometry or slug retention is unsuitable. Burr buildup, double slugs and misalignment can worsen the problem. The slug path should accommodate the complete D profile and orientation.
Slug pulling can result from vacuum, lubricant, magnetism, worn tooling, unsuitable clearance or punch-face condition. The non-round face may make suction and rotation effects more complex. Remedies must match the die design and should not weaken the cutting profile.
The flat and transition areas can increase contact and friction, especially if clearance, relief, finish or alignment is poor. High stripping force applies tension, bending and torque to the punch and retainer. Check penetration depth, lubricant, back taper, stripper bore and orientation.
Breakage can result from rotation, misalignment, side load, excessive unsupported length, tight or uneven clearance, high stripping force, unsuitable grade or heat treatment, sharp transition points, damaged retainers, feeder error or press deflection. Correct the root cause before replacement.
These locations combine changing curvature with concentrated cutting stress. Chipping can result from a sharp transition, brittle heat treatment, local tight clearance, die mismatch, rotation, slug interference or unsuitable coating. Inspect which corner fails and compare it with die alignment.
Rotation can result from an inadequate locking feature, loose retainer, asymmetric cutting load, off-centre stripping, slug interference or damaged key or dowel features. Verify mounting torque, keying, dowels, retainer fit, profile orientation and die alignment.
Uneven wear usually indicates angular or radial misalignment, non-uniform clearance, die-profile mismatch, guide wear, press deflection or asymmetric stripping. Compare wear on the curved side, flat and transition points and inspect the matching die opening.
Galling is adhesive transfer of sheet material to the punch and is promoted by friction, heat, rough finish, poor lubrication, unsuitable clearance and adhesive work materials. Buildup along the flat or guided surface can increase stripping force and rotate or deflect the punch.
The same profile may need different clearance, grade, coating, relief and lubricant for different sheet materials. Stainless can gall and require higher stripping force, while aluminium can build up. Specify alloy, temper, thickness, finish requirement and production volume.
High-strength sheet increases cutting load, snap-through shock, stripping force and transition stress. The design may require stronger support, suitable HSS grade, larger allowable transition radii, increased clearance, coating, improved guidance and verified press rigidity.
A suitable stamping lubricant can reduce friction, heat, galling and stripping force. It should reach the curved side, flat and transition areas and remain compatible with the coating and downstream operations. Excess or unsuitable lubricant may contribute to slug pulling or contamination.
Sharpen when burr, profile accuracy, transition condition, press load or maintenance records show wear. Regrinding must preserve the curved diameter, flat position, transition geometry, orientation and point length. Inspect the matching die and clearance at the same time.
Use a controlled setup referenced to the shank and orientation datum. Remove material uniformly from the cutting face, preserve the circle diameter, flat dimension, transition radii and angular position, and record reduced point length. Confirm that the reconditioned profile still matches the die opening.
A D-profile drawing should define the full circle or arc diameter, flat position, chord length, distance from the centre to the flat or remaining height, transition radii, orientation angle, point length, shank, head or retainer, overall length, tolerances, material, hardness and coating.
The page lists 50 mm, 70 mm, 80 mm and 100 mm lengths plus customised lengths. The final drawing should distinguish overall length, cutting-point length, guided length, head thickness and minimum usable length after regrinding.
Yes. The live page states that customisation and customised lengths are available. Send the die stack-up, stripper position, required penetration, guide support, profile dimensions, overall and working length, mounting style, HSS grade and quantity for technical review.
The report should cover the circle or arc diameter, flat, chord or offset dimension, transition radii, angular orientation, profile position, shank and head dimensions, overall and point length, concentricity, runout, finish, hardness zones and coating. The drawing must define datums and view direction.
Send a dimensioned PDF and available STEP, IGES or native CAD file showing whether D means a flat-sided cutting profile or a standard punch form, all profile dimensions, orientation, shank or head, lengths, radii, grade, hardness, coating, tolerances, finish, sheet material and quantity.
Price depends on the exact D-shape interpretation, profile and flat dimensions, orientation and locking, head or shank style, lengths, M2, M35 or M42 grade, heat treatment, finish, coating, tolerances, quantity, inspection, packaging and destination. A complete drawing is required.
The live page states a minimum order quantity of 25 pieces. Confirm whether the MOQ applies to each unique profile, standard, grade, length and coating and whether mixed sizes can be combined. Highly customised or precision-oriented punches may have different conditions.
The page states carton packaging or packing to client requirements. The cutting profile, flat transitions, precision shank, orientation features and coating should be protected against impact, corrosion and mixing. Confirm individual sleeves, labels, inspection documents and export packing.
The live page states that standard items are maintained in stock. Actual availability depends on whether D refers to profile or standard form, dimensions, grade, length, head or retainer, coating and quantity. Request confirmation against a part number or approved drawing.
Vardhman operates from the Bhayandar/Mumbai region of Maharashtra, supplies buyers across India and positions D Shape HSS punches for worldwide export. Send the drawing, standard or profile definition, grade, quantity and destination for technical confirmation, price, inspection, packaging and delivery terms.
Use the enquiry page and send the exact D-shape definition, dimensioned drawing, orientation and view, shank or head, lengths, M2, M35 or M42 preference, hardness, coating, tolerance, sheet material and thickness, quantity, inspection, packaging and destination. Approve the final drawing before production.
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