Metal Shear Blades FAQ
Q1: What are the best materials for metal shear blades?
A1: 9CrSi features good impact toughness for common mild steel cutting. D2, Cr12MoV and SKD-11 own strong wear resistance, perfect for cold cutting carbon steel, stainless steel and medium-thin plates. H13 delivers excellent heat resistance and toughness, fit for hot shearing and heavy thick plate cutting.
Q2: How to select proper shear blades for actual cutting work?
A2: Confirm cutting materials first. Choose 9CrSi or D2 for mild steel, D2 or Cr12MoV for stainless and alloy steel, H13 for hot rolled metal and thick plates. Pick high toughness blades for thick sheets to avoid chipping. Use wear resistant blades for long continuous cutting, and cost-effective 9CrSi for intermittent work. Match blade size and hole position with your shear machine.
Q3: Which blade material suits different metal types?
A3: Use 9CrSi and D2 for mild steel and carbon steel. D2, Cr12MoV and high speed steel work well on stainless steel and alloy steel. H13 is ideal for hot rolled metal and thick heavy plates with reliable anti-chipping performance.
Q4: What is the ideal hardness of shear blades?
A4: The standard hardness ranges from HRC 58 to 62. Over hard blades tend to chip easily, while overly soft blades wear quickly and produce cutting burrs.
Q5: How to set reasonable blade clearance?
A5: Basic clearance accounts for 5% to 10% of sheet thickness. Mechanical shears keep around 7% clearance, and hydraulic shears stay between 7% and 15%. Too small clearance causes blade collision and damage. Excessive clearance results in rough cuts and heavy burrs.
Q6: Can a single blade cut various kinds of metal?
A6: It is not recommended. Mixed cutting accelerates blade dulling and uneven wear, greatly shortening service life.
Q7: What leads to heavy burrs on cut surfaces?
A7: Blunt cutting edge, oversized blade clearance and misaligned blade installation are main reasons. Solve the problem by sharpening blades, adjusting clearance and correcting blade position.
Q8: Why do blade edges get chipped or cracked?
A8: Small clearance, mismatched blade material, over-thickness cutting and defective heat treatment will damage blades. Adjust clearance properly, adopt tough blade materials and avoid overload cutting.
Q9: How frequently should we inspect shear blades?
A9: Check blade sharpness and surface damage daily before operation. Examine alignment and clearance every week. Conduct comprehensive maintenance and grinding inspection monthly.
Q10: Is self sharpening of shear blades available?
A10: It can be done with professional grinding machines. Factory precision sharpening is more suggested to ensure flatness and edge accuracy.
Q11: When do we need to replace old shear blades?
A11: Replace blades when obvious cracks and chippings appear, burrs cannot be eliminated after sharpening, or uneven wear brings unstable cutting quality.
Q12: Do you offer customized shear blades?
A12: Yes. We customize blade size, material, hole location, heat treatment and surface coating according to client machine demands.
Q13: How long is the product delivery period?
A13: Standard blades take 7 to 10 working days. Custom blades need 10 to 15 working days.
Q14: What surface coatings can be applied on blades?
A14: TiN, TiCN and DLC coatings are available. They improve wear and corrosion resistance and prolong blade service time.
Q15: What is your product warranty rule?
A15: 3-month warranty applies under normal operation. We provide free replacement for quality defects. Damage from improper use and overload is not within warranty scope.
Q16: What safety rules apply during blade usage?
A16: Stop the machine completely before assembling or removing blades. Tighten fixing bolts with standard torque. Keep hands away from cutting zone while working. Remove metal scraps regularly to protect blades.
