Sand mold milling method and apparatus based on double-processing primary shaft

Abstract

The invention discloses a sand mould milling method based on a double processing main shaft and a device adopting the method. The method comprises the following steps: according to a cast drawing, a three dimensional solid model of the part is established, and according to the solid model, a cast mould cavity is reversely worked out; according to the size and the number of the processing sand moulds, the cutter selection, the path planning and the milling parameter set are performed; NC codes are generated; the sand moulds which are cured to form in advance are fixed on a worktable; according to driving codes, a double main shaft machine tool is control to carry out the milling process of the sand moulds; and the processed sand moulds are subjected to post treatment. The used devices comprises a machine tool body provided with a worktable, the machine body is provided with a guide rail, the guide rail is provided with a cross beam, the cross beam is provided with a left slide frame and a right slide frame respectively provided with z shafts capable of moving up and down, the processing main shafts are fixed on the z shafts, and the lower surfaces of the processing main shafts are provided with cutter heads. The processing method has the wider processing range and higher processing efficiency, and is particularly applied to the manufacturing of large-sized sand moulds in single piece and small batch.

Description

technical field [0001] The invention belongs to the intersecting technical field of casting and numerical control machining, and in particular relates to a sand mold milling method and a device thereof based on double machining spindles. Background technique [0002] Casting can produce complex parts and is one of the most important processing methods for metal forming. With the globalization of the market and the intensification of competition, the speed of product upgrading is accelerating, and the demand for single-piece and small-batch castings is increasing. The production process of single-piece, small-batch, especially large-scale castings requires a short production cycle. , the manufacturing method is more flexible. However, the vast majority of manufacturers in my country still use the traditional wood foundry process, which not only has a long manufacturing cycle, high production costs, but also consumes a lot of resources. [0003] At present, there are three p...

AI Technical Summary

Problems solved by technology

[0004] Traditional wooden sand mold manufacturing is suitable for the production of large quantities of castings. Due to the long processing period and high cost of wooden molds, it is difficult to manufacture high-precision and good surface quality molds, which cannot meet the processing requirements of single pieces and small batches.

The use of rapid prototyping technology to manufacture sand molds has the following disadvantages: layer-by-layer processing, low processing efficiency, and not suitable for processing large molds; binders or laser sintering will bond sand particles together to form a mold with a dense inner surface, poor air permeability, and castings Defects are prone to occur; layered processing will produce a step effect when processing some complex surfaces

The use of single-spindle CNC machine tools for sand cutting has the following disadvantages: the milling efficiency of large sand molds is not high

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