A method of manufacturing a relief cavity forming tool

 

(57) Abstract:

The inventive method comprises pre-forming cavity of the extruded with a cross-sectional dimension exceeding 0.1 ... 1.9% of the size of the finished cavity, at temperatures of thermal and wire EDM. 1 C.p. f-crystals.

The invention relates to the processing of metals by pressure, in particular to the production of a molding die tools.

Tool manufacturer for die forging with precise relief cavities is the most difficult in the production of tooling.

A known method of manufacturing a relief cavity forming tool, comprising pre-forming cavity, thermal and electrical discharge processing, which is carried out in two or more transitions. If necessary, apply metal-mechanical lapping of individual sections of the stamps.

The disadvantage of this method are: a significant duration EDM processing; increased consumption of electrodes; metalwork finishing individual plots (radius, and so on).

The main disadvantage is unchanged cont the key to the destruction of the matrix. Resistance matrices for stamping performance 60-250 PCs/min significantly reduced.

The technical result of the invention is expressed in the reduction of the process time and the exclusion of hazardous micro-watersheds contributing to the destruction of the molding die tools.

According to the invention in the method of manufacturing a relief cavity forming tool, comprising pre-forming cavity, thermal and electrical discharge processing, pre-forming cavity is performed by extrusion with a cross-sectional dimension exceeding 0.1-1.9% of the size of the finished cavity. The extrusion cavity is carried out at temperatures ASC1- (10-100)aboutC.

The method is as follows. Heated to 810aboutWITH AC1- [(10--100)aboutWith] the blank matrix with a diameter of 58 mm of tool steel HM served on a landing machine (A). Forming polyhedral cavity of the matrix carry out multi-faceted master punch of steel R6M5 with cross-sectional dimension of 24,16 mm for 1 transition. After landing procurement matrix is fed to heat, and then the final wire EDM is CLASS="ptx2">

Extrusion, hardening heat treatment and pressing molding cavity in the band accompanied by a reduction (shrinkage) of the cross-sectional sizes. Total shrinkage is defined as

=1+2+3where1the transverse shrinkage of the size of the cavity after the extrusion is determined by the temperature-speed conditions of extrusion parameters extruding cavity and preform 1= 0,1-0,9%;

2the shrinkage during hardening heat treatment depends on the type of material and heat treatment,2= 0-0,6%;

3- shrinkage surfaces depends on the ratio of the cavity and the workpiece in which it is extruded, form fitting and radial preload3= =0-0,4%.

Thus, the total shrinkage = =0.1 to 1.9 per cent.

In the above example, the total shrinkage for steel HM is

= 1.3%) and its components

1= 0.75 to shrinkage during extrusion

2= 0,30 - the same, in heat

3= 0.25 to the same, during the pressing.

Thus, based on these consolidation-the exact size of the master punch is 24,16 mm

The interval of heating temperature ANDC1- (10--100aboutWith grounded practical zoobentosis measuring instruments and so on, giving a total error of at least 40aboutC.

Thus, the method of forming a relief cavities in the die tool provides accurate configurations relief cavities by stamping, with reduced flight operations.

Precision accounting for the effects of factors on the change of the size and temperature of heating provides relief forming cavities with a high degree of accuracy, while finishing EDM with minimal metal removal ensures the high quality of the produced compound instrument.

1. A METHOD of MANUFACTURING a RELIEF CAVITY FORMING TOOL, comprising pre-forming cavity, thermal and electrical discharge processing, wherein the pre-forming cavity is performed by extrusion with a cross-sectional dimension exceeding 0.1-1.9% of the size of the finished cavity.

2. The method according to p. 1, characterized in that the extrusion cavity is carried out at temperatures Ac1- (10-100)oC.

 

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