A method for correcting the inclination of mold precast hole

Abstract

The invention relates to an inclination correcting method for a mold pre-casting hole, and discloses a method for realizing inclination correction of a pre-casting hole by pre-deflecting of a mold core on a mold. The inclination correcting method is characterized by comprising the following steps that position degree measurement is conducted on the pre-casting hole on an aluminum alloy cylinder body through a three coordinate, then the offset amount of all bit depths of the pre-casting hole is analyzed, the mold is adjusted, the molding mold core corresponding to the pre-casting hole is taken out, hole expanding is conducted on an installing hole of the molding mode core, a guide sleeve is manufactured, the guide sleeve is installed in the installing hole after hole expanding is conducted, the guide sleeve is fixed through a rotation stopping notch, the molding mold core is loaded, the molding end of the mold core inclines under the action of the inner wall of the guide sleeve, so that inclination generated during contraction force action and washing is counteracted, correction is completed, accuracy of the hole position can be ensured, stability of the size of the pre-casting hole is improved, using for subsequent processing is facilitated, and the machining efficiency is improved.

Description

technical field [0001] The invention relates to a method for correcting the inclination of a mold precast hole, relating to a method for correcting the curvature of a precast hole on a cylinder head surface during the casting process of an aluminum alloy cylinder body, and belongs to the field of mold equipment. In particular, it relates to a method for realizing inclination correction of a pre-casting hole by pre-deflecting a core on a mold. Background technique [0002] At present, in the casting process of the aluminum alloy cylinder blank, due to the huge structure of the mold, the cooling speed of each point in the cavity is uneven, and the structural wall thickness of the cylinder itself is different, so on the cylinder, especially the cylinder head There are usually 10 mounting holes for four-cylinder engines and 8 for three-cylinder engines. The pre-casting depth of cylinder head holes is generally between 60-70mm, and the diameter of the mouth is generally between φ...

AI Technical Summary

Problems solved by technology

[0002] At present, in the casting process of the aluminum alloy cylinder blank, due to the huge structure of the mold, the cooling speed of each point in the cavity is uneven, and the structural wall thickness of the cylinder itself is different, so on the cylinder, especially the cylinder head There are usually 10 mounting holes for four-cylinder engines and 8 for three-cylinder engines. The pre-casting depth of cylinder head holes is generally between 60-70mm, and the diameter of the mouth is generally between φ8mm-φ10mm. Due to the pre-casting holes Therefore, in order to ensure the life of the mold, the core corresponding to the pre-casting hole should be made of a material with certain toughness, such as: H13, SKD61 and other grades of metal. During the casting process, due to the erosion of the gate to the core, and The difference in shrinkage will cause the mounting hole on the cylinder head surface to bend during pre-casting, so that the threaded bottom hole can only be machined to one side during machining, and the other side will be machined due to the bending of the pre-cast hole. The incomplete thread of the thread will affect the installation of the subsequent sequence. The existing one will be slightly adjusted through the coordinates of the machining spindle during machining, so that the position of the pre-casting hole is centered and complete machining is ensured. However, after adjustment, the tool When entering the hole, due to the inclination of the pre-casting hole position, the tool vibrates severely. In severe cases, the tool will break and affect the processing progress. The method of adjusting the processing program can only be adjusted within the range of dimensional tolerance and position tolerance. , the range is limited, the damage to the tool is large, and the problem of bending the pre-cast hole cannot be solved from the blank, which directly affects the use of the aluminum alloy cylinder blank in the subsequent automatic processing process

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