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Technical standards for DTH drill bits with pressed alloy teeth
Carbide column teeth must be chamfered and rounded:
When grinding the outer circle, increase the amount of coolant to fully cool the alloy teeth. Pay special attention to controlling the feed amount: the feed amount is <0.03mm during rough grinding, and the feed amount does not exceed 0.01mm during fine grinding. The surface finish reaches 7, and the taper and ovality should be less than 0.008mm
May 29th,2024
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Technical standards for DTH drill bits with pressed alloy teeth
1 Carbide column teeth must be chamfered and rounded:When grinding the outer circle, increase the amount of coolant to fully cool the alloy teeth. Pay special attention to controlling the feed amount: the feed amount is <0.03mm during rough grinding, and the feed amount does not exceed 0.01mm during fine grinding. The surface finish reaches 7, and the taper and ovality should be less than 0.008mm2yk drill low air pressure drill bits drill tooth holes, high air pressure drill bits must drill or drill and ream tooth holes:2.1 Hole diameter requirements:When drilling holes: the total length of ovality and taper is about 0.01mm, the hole surface is smooth, and the finish is equal to or greater than 4When reaming holes: the total length of ovality and taper is about 0.01mm, and the hole finish reaches or exceeds 5.2.2 Hole depth requirements:The height of the ball teeth exposed from the drill body must be equal to or slightly less than the radius of the alloy column teeth, and the height difference of each tooth on the same plane shall not be greater than 0.5mm2.3 Side tooth requirements: The width of the side teeth must be uniform and consistent, generally 0.7-0.9mm.2.4 Hole bottom taper (drilling flower top angle):The taper should match the taper angle of the alloy column tooth end face.3 During the inspection, the hole diameter of each tooth hole needs to be measured. The tolerance of 0.02mm is the first level, and it is marked. According to the hole tolerance, according to the "interference fit of cold pressed alloy column teeth" table, the interference of the alloy column is selected.4 Key points of the process when installing the press teeth:4.1 2-3 pieces of the same or soft iron pads are placed at the bottom of the tooth hole. It is not allowed to not place the pads.4.2 When knocking the alloy column teeth, do not hammer hard. The hammer is made of copper or A3 material and is only used to knock the alloy column teeth.4.3 The hardness of the hydraulic press head shall not exceed HRC39.4.4 When pressing the teeth, adjust the oil pressure. According to the expected pressure of the "interference fit of cold pressed teeth", it can be increased appropriately.When pressing the teeth, the alloy cylinder surface can be smeared with engine oil, and the hole should be clean without burrs, debris and oil.When pressing the teeth, do not pause in the middle and press them into place at one time.5 When installing a high-pressure drill bit, a special clamp must be used.
