Bumper Plastic Mould

Definitely machining should follow the confirmed 3D data of the bumper mould design, and then there should be some tips as followed for processing various holes at different parts of the injection mould.

Non part area grooves and holes:tolerance each side +0.02mm and position tolerance ±0.02mm, angle deviation 0.01/50.0mm, with surface smooth and shinning but no steps.

Sides: 5 degree swear plate groove to peripheral mill, bottom clear corners R3.0, screw at center point; clamping groove, spacer plate hole and core pulling groove hole to CNC mill to perfect smooth.

Hot sprue holes: for front side Ф20.0mm fine milling & boring and process deep to 5mm, hole diameter tolerance +0.02mm, position tolerance ±0.02mm, standard column fitting solid, and horizontal spade drill (132°) to process for the back side by one time.

Waterline holes: deep hole for water tube quick connector space to be processed, make sure all holes connected especially angled holes penetrated.

Core pulling holes: firstly deep hole drilling according to measures of 3D data, allowance of 0.02mm each side, then deep-drill for guide holes and at last CNC boring for back end bush hole with position tolerance ±0.05 and measure tolerance 0～﹢0.02mm.

Precise holes: boring and reaming for dowel pin hole, position tolerance 0~±0.02mm, concentricity required 0.01mm, hole diameter tolerance +0.04mm, standard column fitting loosely and smoothly.

Guide pillar: boring for square guide pillars with tolerance ±0.02mm, position ±0.02mm, no steps.

Truly there has to be some other holes and those processing details related to bumper plastic mould core and cavity, which we don’t introduce here but must take them in consideration and documents before machining steps goes.

http://www.automotive-mold.net/