CN111515338A

CN111515338A - Forming method of cast-in rib plate in iron casting

Info

Publication number: CN111515338A
Application number: CN202010342782.2A
Authority: CN
Inventors: 宋亮; 纳建虹; 苏少静; 姚红汝; 戚梦林
Original assignee: Kocel Machinery Co Ltd
Current assignee: Kocel Machinery Co Ltd
Priority date: 2020-04-29
Filing date: 2020-04-29
Publication date: 2020-08-11
Anticipated expiration: 2040-04-29
Also published as: CN111515338B

Abstract

A method for forming an embedded casting rib plate in an iron casting successfully solves the difficult problem of forming the embedded casting rib plate by winding a heating coil on the embedded casting rib plate and electrifying the heating coil to heat the embedded casting rib plate in the pouring process; by using the method, the cast-in rib plate is preheated to the preset temperature, and the cast-in rib plate in the casting with any shape structure can be heated, so that the temperature of the rib plate is increased, the molten iron wrapping the rib plate can have more heat and can fuse the rib plate for a longer time, the size and the requirement of the cast-in rib plate are ensured, the size accuracy of the casting is high, and the sand core structure is stable.

Description

Forming method of cast-in rib plate in iron casting

Technical Field

The invention relates to a method for forming a cast iron insert, in particular to a method for forming a casting rib plate of an air inlet cylinder of a resin sand iron insert.

Background

The cast-in casting piece is used for forming a complex casting structure, such as a plurality of air inlet cylinder castings, and the structure of the cast-in casting piece is provided with a large cast-in rib plate which is used as a structure for connecting an inner cylinder and an outer cylinder and bears the pressure between the inner cylinder and the outer cylinder. In order to ensure the structure and the size of a product to be accurate and ensure the quality, the rib plate needs to be cast, and the rib plate is designed by adopting the same material as a casting to ensure the one-step molding of the casting. However, for small cast iron insert castings, the size of the relative rib plate is small, the strength often cannot meet the structural strength requirement when the cast iron material is adopted, high-strength steel materials are required, the rib plate is made of steel, and during pouring, the steel rib plate cannot be completely fused due to low molten iron temperature, so that the defect of poor forming is caused, the material strength is low, the castings are scrapped or have quality risks, and the quality problems of casting cracks or size deformation and the like are caused.

Disclosure of Invention

The invention overcomes the problems in the prior art, provides a method for forming the cast-in rib plate in the iron casting, solves the problem of difficult forming of the cast-in rib plate and improves the quality of the casting.

The invention realizes the molding of the cast-in rib plate in the iron casting air inlet cylinder by the following processes:

establishing a three-dimensional model of a product, designing a casting and an embedded casting structure, and improving the fusion of the embedded casting rib plate on the premise of not changing the casting structure; the cast-in rib plate can be cylindrical or in other shapes and is made of conductive metal materials; in order to ensure the strength of the cast-in rib plate, flange structures are adopted at two ends of the cast-in rib plate, which are in contact with molten iron of a casting, and the rib plate is wrapped after the molten iron is cooled, so that the structural strength is increased;

designing a heating coil: the heating coil is a metal coil, and the coil can heat the cast-in rib plate to 500-900 ℃ within 30 min. Wherein, the heating coil wire on the heating coil can twine on the cast-in gusset, and the wire winding connecting wire is outside pulling out the sand mould when the mould assembling. The winding of the heating coil can be simulated and calculated according to the electromagnetic induction principle so as to determine the number of turns N of the winding of the heating coil around the rib plate;

before core making and modeling, a designed heating coil is wound on the cast-in rib plate, before winding, a circle of heat insulation layer is wound on the cast-in rib plate, the heat insulation layer needs to resist high temperature of more than 1000 ℃, the thickness of the heat insulation layer is 10-20mm, the heating coil winding is guaranteed not to be scalded after the cast-in rib plate is heated, then the heating coil winding is wound, and the winding of the heating coil and the setting of a power supply on the outer side position of the cast-in rib plate are completed. Ferromagnetic sand cannot be used during molding and core making; after the molding and core making are finished, coating is applied to the sand mold and the sand core, and the coating cannot be applied to the protective cast-in rib plate in the coating process;

before the box is closed, the cast-in rib plates are cleaned by alcohol and are dried, and impurities such as paint, rust and the like cannot exist; when the box is closed, the winding connecting wire of the heating coil is pulled out of the sand mold and is connected with an external power supply;

before pouring is prepared, the heating coil is electrified, the heating coil is wound to heat the cast-in rib plate, the temperature of the cast-in rib plate reaches over 400 ℃ during pouring, and the temperature of the cast-in rib plate is increased, so that fusion is facilitated;

and after the pouring is stopped, stopping electrifying, boxing and taking out the casting after the temperature of the casting is reduced by 300 ℃, and repeatedly using the cast-in rib plate after the cast-in rib plate is collected by the heating coil.

The method is simple and feasible, and successfully solves the difficult problem of forming the cast-in rib plate in the cast-in piece; by using the method, the cast-in rib plate is preheated to a preset temperature, so that the casting with any shape and structure can be heated, the temperature of the rib plate is increased, the molten iron wrapping the rib plate can have more heat and can fuse the rib plate for a longer time, and the two materials are completely fused; the size accuracy is high, and psammitolite stable in structure has guaranteed the size and the requirement of inlay casting muscle board.

Drawings

FIG. 1: schematic diagram of casting structural formula

FIG. 2: schematic structural diagram of cast-in rib plate

FIG. 3: schematic structure diagram of cast-in rib plate A-A

FIG. 4: schematic structure before modeling

FIG. 5: structural schematic diagram of assembled box and core

FIG. 6: sectional view of the core assembly of the mold box

FIG. 7: sectional view A-A of the core assembly of the mold box

FIG. 8: the section B-B of the rear core assembly of the mould assembling is shown in a schematic diagram 1-a casting structure; 2-casting a rib plate; 3-casting mould sample; 4-heating coil; 5-a heat insulation layer; 6-winding a heating coil; 71, sand-molding; 72, sand molding; 81 power line connector 1; 82 power line connector 2; 9-molten iron; 10-molding sand.

Detailed Description

In order to better embody the technical features and advantages of the present invention, the present invention will be further described in detail with reference to specific embodiments. Note that the following described embodiments are illustrative only for explaining the present invention, and are not to be construed as limiting the present invention.

In the embodiment, fig. 1 is a schematic diagram of a casting structure, and an insert rib plate 2 is cast on the casting structure 1 in an insert manner. A three-dimensional model of a product is established, a casting and an embedded casting structure are designed, in order to ensure the strength of the embedded casting rib plate 2, the embedded casting rib plate 2 is cylindrical, flange structures are adopted at two ends of the embedded casting rib plate 2, which are in contact with casting molten iron 9, and the embedded casting rib plate 2 is wrapped after the molten iron 9 is cooled, so that the structural strength is improved. And designing a heating coil 4, wherein the heating coil 4 can heat the cast-in rib plate 2 to 500-900 ℃ within 30min, and the number N of turns of heating coil winding wound around the rib plate is determined to be 31 turns according to simulation and calculation results.

Before core making and modeling, a heat insulation layer 5 is wound on the cast-in rib plate 2, the heat insulation layer 5 is made of heat-resistant materials resistant to the temperature of more than 1000 ℃, the thickness of the heat insulation layer is 15mm, then a heating coil winding 6 is wound, and winding of coils on the outer side of the cast-in rib plate 2 and setting of a power supply are completed. Fig. 3 is a schematic structural view before molding.

Ferromagnetic sand cannot be used during molding and core making; after the molding and core making are finished, coating is applied to the sand mold and the sand core, and the coating cannot be applied to the protective cast-in rib plate 2 in the coating process;

before the box is closed, the cast-in rib plate 2 is cleaned by alcohol and is dried, and impurities such as paint, rust and the like cannot exist; when the box is closed, the winding connecting wire of the heating coil is pulled out of the sand mold, and two ends of the winding connecting wire are respectively connected with a power wire connector 81 and a power wire connector 82;

before the pouring is prepared, the heating coil 4 is electrified, the heating coil wire 6 heats the cast-in rib plate 2, the temperature of the cast-in rib plate can reach more than 400 ℃ during the pouring, and the temperature of the cast-in rib plate is increased, so that the fusion is facilitated;

and stopping electrifying after pouring is stopped, cleaning molding sand around the casting, the rib plate and the coil after the temperature of the casting is reduced by 300 ℃, boxing the casting, removing the heating coil 4 of the cast-in rib plate, and continuously using the casting after treatment.

Claims

1. A method for forming an embedded rib plate in an iron casting, wherein the embedded rib plate is embedded in the iron casting, is characterized by comprising the following steps: designing a casting and an embedded casting structure, and manufacturing an embedded casting rib plate; designing a heating coil; before core making and modeling, arranging a heat insulation layer on an embedded casting rib plate and then arranging a heating coil on the embedded casting rib plate; before pouring, the heating coil is electrified to heat the cast-in rib plate, and pouring is carried out after the temperature of the cast-in rib plate is raised to a preset temperature.

2. The method for forming the cast-in rib plate in the iron casting according to claim 1, wherein the cast-in plate is made of a metal conductive material.

3. The method for forming the cast-in rib plate in the iron casting according to claim 1, wherein flange structures are provided at both ends of the cast-in plate, which are in contact with molten iron of the casting.

4. The method for forming cast-in-place rib plates in iron castings according to claim 1, wherein the heating coil has two parts of a heating coil winding and a winding connection line.

5. The method for forming cast-in rib plates in iron castings according to claim 4, wherein the heating coil is wound around the cast-in rib plates.

6. The method for forming cast-in rib plates in iron castings according to claim 1, characterized in that the heating coil heats the cast-in rib plates to 500-.

7. The method for forming cast-in rib plates in an iron casting according to claim 1, wherein the heat insulation layer is resistant to a high temperature of 1000 ℃.

8. The method for forming cast-in rib plates in an iron casting according to claim 1, wherein the thickness of the insulation layer is 10-20 mm.

9. The method for forming cast-in-place rib plates in an iron casting according to claim 1, wherein the temperature of the cast-in-place rib plates reaches more than 400 ℃ during pouring.