Coating device and method for evaporative pattern sample of thin-wall shell piece

Abstract

The invention belongs to the field of machine manufacturing, and particularly relates to a coating device and a method for an evaporative pattern sample of a thin-wall shell piece. The coating device for the evaporative pattern sample of the thin-wall shell workpiece comprises a stirring mechanism (1), a spraying mechanism (2), a coating tank mechanism (3), an auxiliary mechanism (4) and a power controlling cabinet (5), wherein the stirring mechanism (1) is fixedly connected with the spraying mechanism (2); the spraying mechanism (2) is fixedly connected to the coating tank mechanism (3); the coating tank mechanism (3) is fixedly connected with the stirring mechanism (1); a foot table in the auxiliary mechanism (4) is placed beside the coating tank mechanism (3); and the dynamical power of each mechanism is independent. According to the invention, the method integrates spraying and curtain coating, the stirring mechanism, the spraying mechanism, the coating tank mechanism and the auxiliary mechanism are utilized for coating of a large-sized and complex-structured evaporative pattern sample of the thin-wall shell workpiece, so that the deformation or fracture of the sample is avoided during the coating process, the work intensity is reduced, and the normal operation is guaranteed.

Description

technical field [0001] The invention belongs to the field of mechanical manufacturing, and in particular relates to a coating device and method for disappearing patterns of thin-walled shell parts. Background technique [0002] In recent years, lost foam casting has developed rapidly due to its characteristics of high efficiency, high quality, low cost and environmental protection. In China's lost foam casting production, the castings of automobiles, construction machinery and tractor gear transmission housings, and clutch housings are the fastest growing and largest lost foam castings. [0003] The lost foam pattern is made of polystyrene beads foamed in the mold. Due to the low strength and poor rigidity of the polystyrene foam pattern, in order to prevent the pattern from being damaged or deformed during transportation, sand filling and vibration, casting Coating is applied to the surface of the pattern to improve the strength and rigidity of the pattern. Therefore, the ...

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Problems solved by technology

[0004] However, for mass production of large and complex thin-walled shell parts using lost foam casting technology, due to the high density of the coating, the density of the foamed plastic pattern is small (tens of times different from the density of the coating), and the strength and rigidity of the pattern itself is low. The dip coating method is used to apply the pattern, because the density of the paint is too high, the pattern will be deformed or even damaged due to the buoyancy during dip coating, and mass production cannot be realized.

For example, if the overall size is 1050×925×750 (㎜), the solid volume of the casting is about 0.085m 3 The transmission box shell with a theoretical weight of about 615kg is mass-produced by lost foam casting technology. If the pattern is applied by dip coating, it will inevitably cause deformation or even damage to the pattern due to buoyancy during dip coating; Manual flow coating, in the absence of special equipment, not only has low production efficiency and high labor intensity, but also it is difficult to guarantee the coating quality of the inner cavity surface with complex structure

[0005] At present, the lost foam casting technology is used to mass-produce shell castings in China. The shape of the lost foam shape is small in size. Manufacturers often use the dip coating method to apply the shape, that is, add a stirrer to the tank filled with paint. The pattern is dip-coated in the low-speed stirring paint. This method and device for coating and hanging the paint cannot be used for the application of the lost foam pattern of large and complex thin-walled shell parts. The main reasons are: 1. Higher density, generally (1.6-1.65) g / cm 3 , for the above-mentioned large-volume shell-like pattern, if the pattern is applied by dip coating, the buoyancy generated by the pattern in the paint tank is as high as about 130kg, and such a large buoyancy will cause deformation or even breakage of the pattern; 2. In order to ensure The thickness of the coating and the pattern often need to be painted and hanged 2-3 times. With the increase of the number of pattern coating and hanging, the pattern weight of the painted pattern will reach 6-10 times of the original weight of the pattern. If the pattern is applied by manual flow coating Coating, operation is difficult, can not guarantee the uniformity of the inner cavity and outer surface coating of the pattern, and at the same time increases the labor intensity and low productivity

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