Full mold casting technique for diesel engine cylinder body

Abstract

The invention relates to casting methods, in particular to a full mold casting technique for a diesel engine cylinder body. The full mold casting technique for the diesel engine cylinder body comprises the following steps that a, prefoaming is conducted; b, curing is conducted; c, foam forming is conducted; d, models are combined into a cluster; e, the models are coated; f, a mold bed is prepared; g, a full mold model is placed; h, sand filling is conducted; i, sealing and shaping are conducted; j, pouring and displacing are conducted; and k, cooling and cleaning are conducted. The full mold casting technique for the diesel engine cylinder body has the beneficial effects that firstly, excellent foam plastic beads are used for further reducing the amount of residual carbon; secondly, the reasonable bead prefoaming density is effectively controlled, so that the situation that a white mold deforms and even breaks due to the fact that the strength of the white mold is insufficient is avoided, and the defects, such as pores and carbon defects, of castings are also avoided; and thirdly, the problem that the quality of the castings is low is solved, and thus volume production of diesel engine cylinder bodies is achieved.

Description

technical field

[0001] The invention relates to a casting method, in particular to a lost foam casting process for a cylinder body of a diesel engine. Background technique

[0002] Diesel engine cylinder block is a relatively complex casting. Clay sand casting is mainly used in China, and a few enterprises use cold box or hot box casting. However, these casting methods generally have high labor intensity, serious environmental pollution, less recycling of molding sand, waste There are a series of problems such as sand cannot be processed, raw material consumption is heavy, casting weight is heavy, and casting quality cannot be guaranteed (wrong box, sand hole, slag inclusion, air hole, etc.). The emergence of lost foam casting has completely solved the defects of traditional sand casting, such as wrong box, trachoma, slag inclusion, pores, rough surface, etc., and the castings produced by lost foam casting process can effectively control casting defects, and the smoothness h...

Examples

Embodiment Construction

[0018] The present invention will now be further described in conjunction with specific examples, and the following examples are intended to illustrate the present invention rather than further limit the present invention.

[0019] A lost foam casting process for a diesel engine cylinder block, comprising the following steps: selecting expandable methyl methacrylate and styrene copolymer resin beads, and the particle size of the original beads is equal to 1 / 10 of the minimum wall thickness of the casting , inject 1 kg of expandable methyl methacrylate and styrene copolymer resin beads into the intermittent steam pre-expansion machine at a time, and use time relay and temperature controller to control synchronously. The pre-expansion time is 35s and the temperature is 95°C. Simultaneously, control the pre-expansion density to be 23g / l; Place the pre-foamed expandable methyl methacrylate and styrene copolymer resin beads in a dry, ventilated silo for aging for 12 hours; Methyl m...

technical field

[0001] The invention relates to a casting method, in particular to a lost foam casting process for a cylinder body of a diesel engine. Background technique

[0002] Diesel engine cylinder block is a relatively complex casting. Clay sand casting is mainly used in China, and a few enterprises use cold box or hot box casting. However, these casting methods generally have high labor intensity, serious environmental pollution, less recycling of molding sand, waste There are a series of problems such as sand cannot be processed, raw material consumption is heavy, casting weight is heavy, and casting quality cannot be guaranteed (wrong box, sand hole, slag inclusion, air hole, etc.). The emergence of lost foam casting has completely solved the defects of traditional sand casting, such as wrong box, trachoma, slag inclusion, pores, rough surface, etc., and the castings produced by lost foam casting process can effectively control casting defects, and the smoothness h...

Examples

Embodiment Construction

[0018] The present invention will now be further described in conjunction with specific examples, and the following examples are intended to illustrate the present invention rather than further limit the present invention.

[0019] A lost foam casting process for a diesel engine cylinder block, comprising the following steps: selecting expandable methyl methacrylate and styrene copolymer resin beads, and the particle size of the original beads is equal to 1 / 10 of the minimum wall thickness of the casting , inject 1 kg of expandable methyl methacrylate and styrene copolymer resin beads into the intermittent steam pre-expansion machine at a time, and use time relay and temperature controller to control synchronously. The pre-expansion time is 35s and the temperature is 95°C. Simultaneously, control the pre-expansion density to be 23g / l; Place the pre-foamed expandable methyl methacrylate and styrene copolymer resin beads in a dry, ventilated silo for aging for 12 hours; Methyl m...