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Precision Mould With High Thermal Stability And Good Tissue Condition

Jie Mei Precision Mould Ltd | Updated: Aug 08, 2017

From the signing of the Precision Mould manufacturing orders to the qualified molds to deliver the customer to each part of the process may affect the quality of the mold, precision mold manufacturing process according to the system engineering control, must control each link, is the premise of precision mold manufacturing.

The mold part of the guiding ideology is for different mold parts, different materials, different shapes and different technical requirements to develop the appropriate process program. The general process of mold parts is: rough preparation - roughing - semi-finishing - heat treatment (quenching, quenching and tempering) - Precision Mould - electrical processing - fitter finishing and surface processing. Through the processing of the process control, to achieve the required processing accuracy.

1. Material and heat treatment control

Mold parts heat treatment to obtain the required parts of the material hardness at the same time, but also to make the parts processing and processing after the size of the shape can be stable for the different parts of the material and structural features, there are different heat treatment methods, parts must heat treatment stress To control the development of heat treatment process to take full account of the material through the hardenability of hardenability and decarburization sensitivity of the thin-walled parts to use pressure quenching process.

(1) precision mold material selection: In addition to the selection of CrWMn, Cr12, 40Cr, GCr15, Cr12MoV, 9Mn2V carbide, the work of some of the strength, stress hatch, punch, can be used with a high thermal stability And the excellent state of the alloy steel S2, S3, V10, APS23S1, G2, G3, G4, G8 and so on.

(2) after quenching to stress treatment: after quenching the workpiece are retained internal stress, easily lead to follow-up after the workpiece size changes or even crack, so after quenching parts should be hot tempering to eliminate the quenching stress on the complex shape, both inside and outside the corner Of the workpiece, the tempering is not enough to eliminate the quenching stress, finishing before the need for stress relief annealing or multiple aging treatment, the full release of stress.

2. Precision Mould control

Grinding is the key process of precision mold processing. Finishing Grinding must strictly control the appearance of grinding deformation and grinding cracks, and even control the surface cracks in the workpiece. The following aspects should be considered when developing a Precision Mould process.

(1) choose grinding wheel: for the mold material of high tungsten, high vanadium, high molybdenum, high alloy, high hardness characteristics, can choose PA chrome steel jade wheel and GC green silicon carbide wheel; when processing carbide, quenching High hardness of the material, the use of organic binder diamond grinding wheel, organic binder grinding wheel self-grinding good, grinding the workpiece accuracy in IT5 above, roughness up to Ra = 0.16um requirements. CBN cubic boron nitride grinding wheel used in CNC molding grinder, coordinate grinding machine, CNC internal and external grinder for finishing, the effect is better than other types of grinding wheel. Grinding process in time to repair the grinding wheel, to maintain the sharp wheel, when the wheel passivation in the workpiece surface after the friction, scribing, extrusion, resulting in surface burns, micro-cracks or trenches, affecting the processing accuracy.

(2) Feeding amount selection: Precision Mould into the small amount of grinding, grinding to be sufficient to cool, try to choose the cooling medium, processing allowance within 0.01 mm parts to constant temperature grinding.

(3) workpiece clamping: shaft parts are characterized by a number of rotary surface composition, precision machining methods are generally used in the internal and external grinder grinding process, the use of grinding machine chuck and tailstock top clamping positioning workpiece or with the tail The top of the positioning of the workpiece, then the chuck and the top center of the connection is the center line after grinding the workpiece, if the center line beating, the workpiece after the coaxial degree of the workpiece can not meet the requirements, so before processing to do the chuck And the top of the concentric detection and the top of the top of the check hole in the examination of the wall hole grinding to consider the use of clamping process, that is, leaving a thick part of the car processing, to be grinding after the completion of the hole to be removed.

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