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Precision Mould Has A High Thermal Stability And Good

Jie Mei Precision Mould Ltd | Updated: Jul 18, 2017

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

The Precision Mould part of the guiding ideology is for different Precision Mould parts, different materials, different shapes and different technical requirements to develop the appropriate process program. The general process of Precision Mould parts is: rough preparation - roughing - semi-finishing - heat treatment (quenching, quenching and tempering) - precision grinding - 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

Precision Mould 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 Precision Mould 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 grinding control

Grinding is the key process of precision Precision Mould 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 grinding process.

(1) choose grinding wheel: for the Precision Mould 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 Precision Moulding 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 grinding into the small amount of grinding, grinding in the cooling to full, 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.

Precision Mould design must pay attention to Precision Mould flow analysis, data age, and do Precision Mould to use professional software analysis, make full use of analytical data to guide the Precision Mould design. Many people do not trust the flow analysis results, or even simply do not understand the analysis of data, the data will not be analyzed. Some Precision Mould factory Precision Mould flow analysis is the fundamental purpose to do to customers to see, customers do not ask not to do their own do not have to analyze the results, a lot of Precision Mould technicians do not understand the analysis results. Obvious analysis of the results of irrational gate location, filling imbalance, the pressure distribution is not balanced, not adjusted, resulting in local product pressure is too large, a serious imbalance in the Precision Mould, Precision Mould long-term production in the imbalance, not bad strange. Analysis results to remind the product shrinkage risk and the combination of line but not to advance prevention. Precision Mould test mode no problem, the production of a period of time will repeatedly repair mode, and these do not matter? Do not understand is necessary to learn, it is necessary to train, keep up with the times only to be eliminated.

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