Test block and model for online detection of performance of casting molten iron

Abstract

The utility model relates to the technical field of casting and metallurgy, in particular to a test block and a model for detecting the performance of cast molten iron on line. According to the test block for detecting the performance of the cast molten iron on line, the test block is attached to a casting, the test block comprises a step-shaped test block and a triangular test block, and the step-shaped test block comprises a plurality of steps with different thicknesses. On-site tracking detection can be achieved along with casting forming, the shrinkage porosity and sand burning conditions of casting molten iron are analyzed, the test blocks are arranged to be in a step shape, the shrinkage porosity and sand burning conditions of the test blocks with different thicknesses and different solidification periods of the molten iron are detected and analyzed, and therefore the problem of casting sand burning is effectively solved; the device can also be used for detecting the strength and hardness of test blocks with different wall thicknesses, so that the strength and hardness performance indexes at different thicknesses of a casting can be known.

Description

Technical Field

[0001] This utility model relates to the fields of casting and metallurgical technology, and in particular to a test block and model for online testing of the properties of molten iron. Background Technology

[0002] Currently, in the field of casting metallurgy, the detection of casting composition and inoculation quality is mainly carried out by taking molten iron and casting triangular or spectral test blocks before pouring. However, this detection method requires the preparation of models in advance, and the operation process is relatively complicated. Moreover, the existing test blocks can only estimate the tensile strength and hardness of the casting, and the test results are greatly affected by the position of the test block. At the same time, the existing test blocks cannot effectively detect and analyze the shrinkage porosity and sand adhesion of the casting, so the problem of sand adhesion in the casting cannot be effectively solved. Utility Model Content

[0003] In order to solve the above-mentioned technical problems in the prior art, this utility model provides a test block and model for online detection of the properties of molten iron.

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0005] The first aspect of this utility model is to provide a test block for online testing of the properties of molten iron. The test block is attached to the casting and includes a stepped test block and a triangular test block. The stepped test block includes several steps of different thicknesses.

[0006] The test block for online testing of molten iron properties, as described in this invention, is attached to the casting. It allows for on-site tracking and analysis of shrinkage porosity and sand adhesion in the molten iron as the casting is formed. By setting the test block to a stepped shape, the shrinkage porosity and sand adhesion of test blocks of different thicknesses and at different solidification stages can be analyzed, effectively solving the problem of sand adhesion in castings. After the molten iron has solidified, the strength and hardness of test blocks with different wall thicknesses are tested to understand the strength and hardness performance indicators at different thicknesses of the casting.

[0007] Based on the above technical solution, the present invention can also be improved in the following ways:

[0008] Furthermore, the stepped test block is connected to the casting through an internal gating system.

[0009] Furthermore, the triangular test block is connected to the stepped test block.

[0010] The beneficial effect of adopting the above-mentioned further technical solution is that the performance of the cast iron can be further detected and analyzed by measuring the white iron width of the triangular test block.

[0011] Furthermore, the triangular test block is connected to the end of the stepped test block that is provided with the inner gating system of the test block.

[0012] Furthermore, the length of the gating system in the test block is 25-35 mm, and the thickness is 3-5 mm.

[0013] The beneficial effects of adopting the above-mentioned further technical solution are as follows: by setting the ingate and sprue of the test block as a slender and thin structure, the molten iron can be cooled quickly after entering the test block cavity through the ingate. Among them, the tip of the triangular test block cools the fastest, thereby forming a white iron structure of a certain width. Based on the width of the white iron structure (white iron width), the degree of supercooling of the molten iron and the quality of inoculation can be predicted.

[0014] The second aspect of this invention is to provide a model for manufacturing castings and a test block for online testing of the properties of molten iron.

[0015] Furthermore, the model includes interconnected casting cavities and test block cavities.

[0016] Furthermore, the model is a sand mold.

[0017] Compared with the prior art, the present invention has the following technical effects:

[0018] The test block provided by this utility model for online testing of the properties of molten iron can realize on-site tracking and real-time monitoring of casting quality. By attaching the test block to the casting, on-site tracking and analysis of shrinkage porosity, sand adhesion, undercooling degree, and inoculation quality of the molten iron can be achieved as the casting is formed. By setting the test block into a stepped shape, the shrinkage porosity and sand adhesion of test blocks of different thicknesses and at different solidification stages of molten iron can be detected and analyzed, thereby effectively solving the problem of sand adhesion in castings. The stepped test block can be cut along the center line to detect the strength and hardness of test blocks of different wall thicknesses, thereby understanding the strength and hardness performance indicators of castings at different thicknesses. Attached Figure Description

[0019] Figure 1 A schematic diagram of the structure of the test block of this utility model is shown;

[0020] Figure 2 This diagram shows the structure of the molded part after casting.

[0021] Figure 3 A schematic diagram of the white-faced state of the triangular test block is shown;

[0022] Figure label:

[0023] 1. Test block; 11. Stepped test block; 12. First step; 13. Second step; 14. Third step; 15. Triangular test block; 16. Inner runner of test block; 2. Casting; 3. Gating system; B. White iron structure. Detailed Implementation

[0024] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0025] See Figure 1-2 A test block for online testing of the properties of molten iron is disclosed. The test block 1 is attached to a casting 2. The test block 1 includes a stepped test block 11 and a triangular test block 15 connected together. The stepped test block 11 has three steps of different thicknesses: a first step 12, a second step 13, and a third step 14. The stepped test block 11 is connected to the casting 2 through an inlet sprue 16. The triangular test block 15 is connected to the end of the stepped test block 11 where the inlet sprue 16 is located. In this embodiment, the casting 2 is a brake drum.

[0026] During the casting process, test block 1 and casting 2 are poured simultaneously. After pouring and sand removal, test block 1 is attached to one side of casting 2. By cutting the stepped test block 11 along the center line, the strength, hardness, and other mechanical properties of the test block at different wall thicknesses can be tested. This can truly reflect the mechanical properties at different locations of the casting, thereby reducing the influence of casting thickness variations on the reliability of mechanical property test results. Furthermore, the stepped test block 11 has different thicknesses in the first step 12, the second step 13, and the third step 14. During the pouring process, the cooling rate of the molten iron is different, resulting in different solidification times. This represents the solidification of molten iron at different thicknesses in casting 2. By detecting and analyzing the sand adhesion at different parts of the stepped test block 11, pouring conditions such as molten iron temperature, molten iron composition, gating design, and casting structure can be improved. This can improve the shrinkage porosity and sand adhesion problems of casting 2 and enhance the quality of casting 2.

[0027] The length of the ingate 16 of the test block is 25-35mm and the thickness is 3-5mm. The ingate 16 and the ingate of the test block are set as a slender and thin structure so that the molten iron can be cooled quickly after entering the test block cavity through the ingate 16. Among them, the tip of the triangular test block 15 cools the fastest, thereby forming a white iron structure B of a certain width.

[0028] The solidification transformation of cast iron alloys exhibits dual characteristics, see [link to relevant documentation]. Figure 3 For the pointed tip of the triangular test block, the molten iron cools at a relatively high rate. This excessively rapid cooling causes carbon to precipitate as cementite, forming a white cast iron structure. Cementite is hard and brittle, affecting machinability and performance, and is an undesirable structure in castings. Furthermore, a low carbon-silicon equivalent or a high content of certain trace elements in the molten iron also increases the tendency for white cast iron formation. Conversely, when the molten iron cools at a relatively low rate (i.e.,...)... Figure 3 In the middle triangular test block (the end furthest from the tip), carbon precipitates in the form of graphite, forming a normal gray cast iron structure.

[0029] Therefore, based on the width of the white iron structure B, i.e., the white iron width S2, the degree of undercooling and inoculation quality of the molten iron can be predicted.

[0030] This invention also provides a model for casting. Figure 1 The structure described herein is a sand mold, comprising a connected casting cavity and a test block cavity, so that test block 1 and casting 2 are cast and molded simultaneously.

[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A test block for online testing of the properties of molten iron, characterized in that, The test block is attached to the casting. The test block includes stepped test blocks and triangular test blocks. The stepped test block includes several steps of different thicknesses. The stepped test block is connected to the casting through an internal gating system.

2. The test block for online detection of the properties of molten iron according to claim 1, characterized in that, The triangular test block is connected to the stepped test block.

3. The test block for online detection of the properties of molten iron according to claim 2, characterized in that, The triangular test block is connected to the stepped test block at one end where the internal gating system of the test block is located.

4. The test block for online testing of the properties of molten iron according to claim 1, characterized in that, The length of the gating system in the test block is 25-35mm, and the thickness is 3-5mm.

5. A model, characterized in that, For use in manufacturing castings and for test blocks for online testing of the properties of molten iron as described in any one of claims 1 to 4.

6. The model according to claim 5, characterized in that, The model includes a connected casting cavity and a test block cavity.

7. The model according to claim 5, characterized in that, The model is a sand mold.

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