Cast iron product white cast sample preparation mold and method for manufacturing white cast sample

Abstract

The invention discloses a cast iron product white cast sample preparation mold and a method for manufacturing a white cast sample, the cast iron product white cast sample preparation mold comprises a metal outer mold with an assembly cavity and a metal inner mold which is installed in the assembly cavity and is in clearance fit with the assembly cavity, and a mold cavity is formed in the metal inner mold; the cavity comprises a pouring opening distributed in the first end of the metal inner mold and a forming groove formed in the end face, away from the pouring opening, of the metal inner mold and communicated with the pouring opening, the end opening of the forming groove abuts against the assembling cavity, the depth of the forming groove does not exceed 2 mm, the diameter of the forming groove does not exceed 30 mm, and the end opening of the forming groove abuts against the assembling cavity. By means of the sample preparation mold, the white cast part can be machined through quenching under the condition that cutting and grinding are not conducted, the sample preparation time is saved, the sample preparation steps are simplified, and on-the-spot analysis can be rapidly and efficiently completed.

Description

Technical Field

[0001] The invention belongs to the technical field of cast iron product processing, and in particular relates to a cast iron product white cast sample making mold and a method for manufacturing the white cast sample. Background Art

[0002] The spark direct reading spectroscopy detection method is currently the most widely used component detection method in the casting field. The composition of cast iron is complex, and the existence form of carbon has a significant impact on the spectral analysis results. White cast iron refers to the absence of graphite precipitation during the crystallization process, and all the carbon in the casting exists in the form of infiltrated carbon bodies. When there is free carbon on the surface of cast iron (such as graphite in gray iron), it will affect the results of spectral analysis, because graphite will interfere with the reading of spectral lines, thereby affecting the accurate determination of element content. Therefore, in order to obtain accurate spectral analysis results, it is necessary to ensure that the analysis surface of the cast iron sample is white, that is, carbon exists in the form of carbides, rather than free graphite.

[0003] The traditional method of manufacturing white cast iron product samples usually uses a columnar sand mold or iron mold to pour molten steel into the mold from the mold mouth. After the sample is demolded, it is necessary to cut the sample to obtain a white cast sample, and then grind the cut end face to obtain a flat end face for easy observation and analysis by spectrometers and other equipment. Such a sample preparation process is cumbersome and complicated, and cannot meet the requirements of fast and efficient furnace analysis. Summary of the invention

[0004] In view of the technical problems in the prior art of making white cast samples, the process is complicated, the operation is cumbersome, and the requirements for fast and efficient furnace front analysis cannot be met, the present invention provides a cast iron product white cast sample making mold and a method for making white cast samples.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A mold for making a white cast iron product sample, comprising a metal outer mold having an assembly cavity and a metal inner mold installed in the assembly cavity and loosely matched with the assembly cavity, wherein the metal inner mold has a mold cavity inside, wherein the mold cavity comprises a pouring port distributed at a first end of the metal inner mold, and a molding groove arranged on an end surface of the metal inner mold away from the pouring port and communicating with the pouring port, wherein a port of the molding groove abuts against the assembly cavity, and a groove depth of the molding groove does not exceed 2 mm, and a groove diameter does not exceed 30 mm.

[0007] Furthermore, the assembly cavity is recessed from the top end toward the bottom end of the metal outer mold, and the assembly cavity is a structure in which the radial dimension gradually decreases from the top end to the bottom end.

[0008] Furthermore, the shape of the metal inner mold is adapted to the shape of the assembly cavity, and the metal inner mold includes two symmetrically arranged mold cores, each of which is provided with a sample-making part, and the sample-making parts on the two mold cores can be assembled to form a mold cavity, and the first end port of the mold cavity is defined as the pouring port, and the end face of the pouring port is at the same horizontal level as the top surface of the assembly cavity.

[0009] Furthermore, the mold cavity also includes a first molding cavity recessed from the top of the pouring port toward a direction away from the pouring port, and a second molding cavity arranged between the first molding cavity and the molding groove, the first molding cavity and the second molding cavity are connected by a first chamfered portion, and the second molding cavity and the molding groove are connected by a second chamfered portion.

[0010] Furthermore, one end of the first molding cavity away from the second molding cavity is defined as a first end, and the other opposite end is defined as a second end. The first molding cavity is a structure in which a radial dimension gradually decreases from the first end to the second end.

[0011] Furthermore, the inner diameter of the molding groove is smaller than the inner diameter of the pouring port.

[0012] Furthermore, the metal outer mold and the metal inner mold are both made of iron or steel.

[0013] A method for manufacturing a white cast iron product sample using the above-mentioned white cast iron product sample making mold comprises the following steps:

[0014] S1, placing the sample preparation mold on a casting table;

[0015] S2, pouring the melted molten steel into the metal inner mold from the pouring port;

[0016] S3, let stand for 10 seconds;

[0017] S4, taking the white sample out of the sample making mold;

[0018] S5. Put the white mouth sample into cold water to cool it down.

[0019] Furthermore, the pouring temperature of the molten steel in step S2 exceeds 1400°C.

[0020] Furthermore, in step S4, the sample making mold is flipped so that the pouring port contacts the pouring table, and the outer wall of the metal outer mold is knocked with a metal tool. The metal inner mold assembled in the assembly cavity with a clearance fit can be separated from the metal outer mold, and the two mold cores that are against each other are separated to obtain a white mold sample.

[0021] In summary, the beneficial effects of the present invention are as follows: 1. Through the sample making mold, the molten steel in the molding groove and the metal mold form a rapid cooling effect, and the molten steel in the molding groove can be quickly cooled to directly form a white mouth part, and the opening of the molding groove is offset against the assembly cavity, so the end face of the white mouth part after molding is smooth, so there is no need for cutting and grinding to have a white mouth part to be tested, which simplifies the sample making process and can quickly and efficiently produce white mouth samples for furnace pre-analysis. 2. The sample making mold has a simple structure, fast disassembly and assembly, and is convenient for assembly and use. 3. The sample making mold can shorten the sample making time, simplify the sample making process, and make the sample making operation simple and easy, which can reduce the difficulty of production. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention is a schematic structural diagram of a mold for preparing a white cast iron product sample.

[0023] Figure 2 yes Figure 1 Vertical cross-sectional view of .

[0024] Figure 3 yes Figure 1 Schematic diagram of the structure of the middle molding with white mouth.

[0025] Figure 4 It is a structural schematic diagram of the metal outer mold in the present invention.

[0026] Figure 5 It is a structural schematic diagram of the metal inner mold in the present invention.

[0027] Figure 6 It is a structural schematic diagram of a white mouth sample produced by the sample making mold in the present invention.

[0028] In the figure, 100-metal outer mold, 110-assembly cavity, 200-metal inner mold, 210-mold core, 220-pouring port, 230-molding groove, 240-first molding cavity, 250-second molding cavity, 260-first chamfered corner portion, 270-second chamfered corner portion, 300-white mouth sample, 310-white mouth portion, 320-handle portion. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with specific drawings.

[0030] See also Figure 1 , Figure 2 and Figure 4The present invention provides a mold for preparing a white cast iron product sample, comprising a metal outer mold 100 having an assembly cavity 110 and a metal inner mold 200 installed in the assembly cavity 110 and having a clearance fit with the assembly cavity 110. The metal inner mold 200 has a cavity inside, and the cavity includes a pouring port 220 distributed at the first end of the metal inner mold 200, and a molding groove 230 provided on the end surface of the metal inner mold 200 away from the pouring port 220. The end of the molding groove 230 abuts against the assembly cavity 110, and the groove depth of the molding groove 230 does not exceed 2 mm, and the groove diameter does not exceed 30 mm. The metal inner mold 200 and the metal outer mold 100 are cold metals. The molten steel enters the metal inner mold 200 through the pouring port 220 until it enters the molding groove 230. Due to the limitation of the groove depth and groove diameter of the molding groove 230, after the molding groove 230 and the assembly cavity 110 are offset, the molten steel capacity in the molding groove 230 is small. After the molten steel contacts the cold metal inner mold 200, the molten steel contained in the molding groove 230 can contact the metal inner mold 200 to produce a rapid cooling effect. Therefore, the molten steel in the molding groove 230 cools very quickly, so that a white part 310 can be formed to realize the whitening of the sample. The white sample 300 processed by the sample making mold can have a white structure for testing without cutting. In addition, the end face is flat and does not need to be polished. After demolding, the composition can be tested, which simplifies the sample making process and meets the requirements of fast, efficient and accurate furnace analysis.

[0031] The assembly cavity 110 is recessed from the top of the metal outer mold 100 toward the bottom, and the assembly cavity 110 is a structure in which the radial dimension gradually decreases from the top to the bottom. The shape of the metal inner mold 200 is adapted to the shape of the assembly cavity 110. The assembly cavity 110 of such a structure will form a certain taper. The matching metal inner mold 200 will fit tightly during the insertion process due to the extrusion force generated by the taper, thereby generating sufficient friction to achieve self-locking. Locking the metal inner mold 200 is simple and convenient, and the mold can be quickly disassembled and assembled.

[0032] See also Figure 2 and Figure 5 The metal inner mold 200 includes two symmetrically arranged mold cores 210, each of which is provided with a sample preparation part. The sample preparation parts on the two mold cores 210 can be assembled to form a mold cavity. The first end of the mold cavity is defined as the pouring port 220. The end surface of the pouring port 220 is at the same level as the top surface of the assembly cavity 110. The two mold cores 210 are inserted into the assembly cavity 110 and assembled to form a sample preparation cavity. The mold structure is simple and easy to manufacture. Moreover, since the assembly cavity 110 is a structure with a larger diameter at one end and a smaller diameter at the other end, when demolding, the metal inner mold 200 is turned over, and the demolding operation is very simple and easy.

[0033] Please continue reading Figure 2The mold cavity also includes a first molding cavity 240 recessed from the top of the pouring port 220 toward a direction away from the pouring port 220, and a second molding cavity 250 arranged between the first molding cavity 240 and the molding groove 230. The end of the first molding cavity 240 away from the second molding cavity 250 is defined as the first end, and the other opposite end is defined as the second end. The first molding cavity 240 is a structure with a radial dimension gradually decreasing from the first end to the second end. The first molding cavity 240 is similar to a funnel-shaped structure. The pouring port 220 with the largest diameter is used to pour molten steel, which facilitates the molten steel to enter the mold cavity. Moreover, the first molding cavity 240 with such a structure can also quickly guide the molten steel into the molding groove 230.

[0034] For the parts formed in the first forming cavity 240 and the second forming cavity 250, please refer to Figure 6 It is actually an integrally formed extension of the white mouth portion 310, wherein the portion formed by the second molding cavity 250 is limited to the handle portion 320. The staff can conveniently take the white mouth sample 300 for testing by holding the handle. The handle portion 320 processed by the second molding cavity 250 can also facilitate clamping with pliers, and the clamped white mouth sample 300 can be put into cold water for cooling.

[0035] Please continue reading Figure 2 The first molding cavity 240 and the second molding cavity 250 are connected by a first rounded corner portion 260, and the second molding cavity 250 and the molding groove 230 are connected by a second rounded corner portion 270. The two rounded corner portions are helpful for the transmission of pressure and the flow of molten metal, reducing eddy current air inclusion, and facilitating the forming of the white mold sample 300. The first rounded corner portion 260 and the second rounded corner portion 270 can also prevent the white mold sample 300 from generating stress concentration at the sharp angle and causing cracks, thereby improving the strength of the white mold sample 300 itself. The rounded corner treatment can remove the residual stress and cracking defects at the edge of the part, and increase the strength and life of the part.

[0036] See also Figure 5 The inner diameter of the molding groove 230 is smaller than the inner diameter of the pouring port 220. The size of the molding groove 230 determines the size of the white part 310 after processing. The smaller the molten steel volume in the molding groove 230, the more obvious the rapid cooling effect after contacting the metal mold, the faster the cooling speed, and the faster the white part can be formed. However, in order to optimize the detection effect of the spectrometer, the inner diameter of the molding groove 230 is preferably controlled to be no more than 30 mm.

[0037] The metal outer mold 100 and the metal inner mold 200 are preferably made of materials such as iron or steel. When the molten steel enters the molding cavity, the molten steel and the cold iron or cold steel produce a rapid cooling effect to complete the rapid whitening of the molten steel in the molding groove 230.

[0038] A method for manufacturing a white mouth sample, using the above-mentioned sample making mold, comprises the following steps:

[0039] S1. Place the sample preparation mold on a casting platform, with the pouring port facing away from the casting platform.

[0040] S2. Please refer to Figure 3 The melted molten steel is poured into the metal inner mold 200 from the pouring port 220. The pouring temperature of the molten steel is preferably more than 1400°C. The molten steel first enters the first molding cavity 240. Since the first molding cavity 240 is similar to a funnel shape, the end with the largest port is the pouring port 220, which is convenient for pouring.

[0041] S3. After the molten iron enters the forming tank 230, it is left to stand for about 10 seconds, waiting for the molten steel in the forming tank 230 to produce a rapid cooling effect with the cold iron or cold steel, so that the molten steel in the forming tank 230 can be quickly cooled to form a white cast iron.

[0042] S4, the white mold sample 300 is removed from the sample making mold. When removing the mold, the sample making mold is turned over so that the pouring port 220 contacts the pouring platform. In this state, the pouring port 220 abuts against the pouring platform, and the outer wall of the metal outer mold 100 is knocked with a metal tool to facilitate the separation of the metal inner mold 200 and the metal outer mold 100. The metal inner mold 200 assembled in the assembly cavity 110 with clearance fit can be separated from the metal outer mold 100, and the two abutting mold cores 210 are separated to obtain the white mold sample 300.

[0043] S5. Clamp the handle 320 of the white mouth sample 300 with a clamp, and put the white mouth sample 300 into cold water for cooling. The cooled white mouth sample 300 is sent to the spectrometer for component detection.

[0044] The sample making mold and the method for manufacturing a white-mouth sample: 1. Through the sample making mold, the molten steel in the molding groove 230 forms a rapid cooling effect with the metal mold, and the molten steel in the molding groove 230 can be quickly cooled to directly form a white-mouth portion 310, and the notch of the open molding groove 230 is against the assembly cavity 110, so the end surface of the white-mouth portion 310 after molding is flat, so there is no need for cutting and grinding to have the white-mouth portion 310 to be tested, which simplifies the sample making process and can quickly and efficiently produce a white-mouth sample 300 for furnace analysis. 2. The sample making mold has a simple structure, fast disassembly and assembly, and is convenient for assembly and use. 3. The sample making mold can shorten the sample making time, simplify the sample making process, and make the sample making operation simple and easy, which can reduce the difficulty of production.

[0045] The above are only implementation modes of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure made using the contents of the present invention's specification and drawings, directly or indirectly used in other related technical fields, are also within the patent protection scope of the present invention.

Claims

1. A mold for making white cast iron product samples, characterized in that: It comprises a metal outer mold having an assembly cavity and a metal inner mold installed in the assembly cavity and loosely matched with the assembly cavity, wherein the metal inner mold has a mold cavity inside, wherein the mold cavity comprises a pouring port distributed at a first end of the metal inner mold, and a molding groove arranged on an end surface of the metal inner mold away from the pouring port and communicating with the pouring port, wherein a port of the molding groove abuts against the assembly cavity, and a groove depth of the molding groove does not exceed 2 mm, and a groove diameter does not exceed 30 mm.

2. The white cast iron product sample making mold according to claim 1, characterized in that: The assembly cavity is recessed from the top end toward the bottom end of the metal outer mold, and the assembly cavity is a structure in which the radial dimension gradually decreases from the top end to the bottom end.

3. The white cast iron product sample making mold according to claim 2, characterized in that: The shape of the metal inner mold is adapted to the shape of the assembly cavity. The metal inner mold includes two symmetrically arranged mold cores, each of which is provided with a sample-making portion. The sample-making portions on the two mold cores can be assembled to form a mold cavity. The first end port of the mold cavity is defined as the pouring port, and the end face of the pouring port is at the same level as the top face of the assembly cavity.

4. The white cast iron product sample making mold according to claim 3, characterized in that: The mold cavity also includes a first molding cavity recessed from the top of the pouring port toward a direction away from the pouring port, and a second molding cavity arranged between the first molding cavity and the molding groove, the first molding cavity and the second molding cavity are connected by a first chamfered portion, and the second molding cavity and the molding groove are connected by a second chamfered portion.

5. The white cast iron product sample making mold according to claim 4, characterized in that: One end of the first molding cavity away from the second molding cavity is defined as a first end, and the other opposite end is defined as a second end. The first molding cavity is a structure in which the radial dimension gradually decreases from the first end to the second end.

6. The white cast iron product sample making mold according to claim 5, characterized in that: The inner diameter of the molding groove is smaller than the inner diameter of the pouring port.

7. The white cast iron product sample making mold according to claim 2, characterized in that: The metal outer mold and the metal inner mold are both made of iron or steel.

8. A method for manufacturing a white cast iron product sample using the white cast iron product sample making mold according to any one of claims 1 to 7, characterized in that: The steps include: S1, placing the sample preparation mold on a casting table; S2, pouring the melted molten steel into the metal inner mold from the pouring port; S3, let stand for 10 seconds; S4, taking the white sample out of the sample making mold; S5. Put the white mouth sample into cold water to cool it down.

9. The method for manufacturing a white mouth sample according to claim 8, characterized in that: In step S2, the pouring temperature of the molten steel exceeds 1400°C.

10. The method for manufacturing a white mouth sample according to claim 9, characterized in that: In step S4, the sample making mold is turned over so that the pouring port contacts the pouring platform, and the outer wall of the metal outer mold is knocked with a metal tool. The metal inner mold assembled in the assembly cavity with a clearance fit can be separated from the metal outer mold, and the two mold cores that are against each other are separated to obtain a white mold sample.

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