The tin alloy technology has been widely applied in some factories. It not only effectively controls the quality of the mold – it can prevent it in advance, eliminate it beforehand, and greatly shorten the development cycle of new products and mass production. The cycle has made a contribution that cannot be underestimated for the factory to improve product quality, develop, occupy and consolidate the market.

In the mold-type groove inspection, the commonly used methods are as follows: (1) Check the groove size with a caliper, a depth gauge, a template, etc. 2 Pour the sample with salt, wax or gypsum to check whether the groove is misaligned. These conventional methods can effectively control the mold groove size of some relatively simple forgings, but for some complex forgings, the mold groove size and the like are difficult to completely detect, which will inevitably affect the production schedule and increase the production cost. In this connection, combined with the characteristics of the factory to produce large complex forgings and their actual production situation, the in-depth exploration and research of the inspection and control of the mold was carried out, and a new method to solve this problem--tin-bismuth alloy technology was explored. Compared with the above conventional inspection method, the most outstanding advantage of this technology is that it can reflect the shape, size, spatial position and relationship of each part of the mold groove in a true and undistorted manner.

1. Preparation of tin-bismuth alloy and its main physical properties

Knock into 60 × 60 (mm) tin, bismuth two small pieces of metal, evenly mixed according to a certain percentage (the percentage is a certain value, can not be prepared at will), put into a pot or other heated to 350 ° C Heat the inside of the container. During the melting process, it is continually stirred until uniform. If there is scum, remove it. The homogeneous alloy melt is then cast into strips in angle or channel steel for use in casting the sample.

The tin-bismuth alloy is solid at room temperature, silver-white, with a low melting point of only 1350C, low hardness, and a solid-liquid volume shrinkage of 0.051%, which has strong permeability.

2. Treatment of tin-bismuth alloy technology

In the mold-type groove inspection, the volume shrinkage ratio between the solid and the liquid of the tin-bismuth alloy is extremely small, and the volume between the solid and the liquid can be approximated. The sample of the groove is poured, and then the appearance and the sample are respectively The overall inspection of the part size (the thermal size of the forging) and the geometry, etc., found that the processing or design was insufficient.

3. Casting of tin alloy sample in mold groove

In the first step, an appropriate amount of tin alloy strip is taken according to the volume of the groove, and placed in a pot or other heating vessel that has been heated to 135 ° C, and continuously stirred until it is uniform during the melting process.

In the second step, the mold to be poured is uniformly heated to 160-200 ° C (depending on the size of the module, the temperature is lower).

In the third step, the mold is vertically erected (the salt port is facing upward) by conventional salting method, and the alloy liquid is poured along the salting port until the groove is filled.

In the fourth step, after the mold is completely cooled to room temperature, the mold is opened by an appropriate method, and the sample is taken out (the sample cannot be broken).

In the fifth step, it is checked whether the sample conforms to the shape of the groove. If the groove is truly reflected, the inspection is carried out; if it is not, it is re-cast until it conforms to the shape of the groove.

In the sixth step, the mold is appropriately processed according to the inspection result.

Matters needing attention during the pouring process: 1 The mold heating must be uniform, otherwise the impact on the sample cast by the large mold is particularly prominent; 2 the mold to be poured must be treated before cracking; 3 must be tinned Q The alloy residue is cleaned from the mold-type groove after casting; 4 samples can not be filled with defects, excessive residual flash, bending, local deformation and other defects directly affecting the test results.

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