JP2879507B2 - Inoculant automatic weighing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention is used in a foundry. The present invention relates to a series of automatic devices that analyze a raw iron material, calculate the type and amount of an inoculant to be mixed with a small amount of the raw iron material, and correctly cut out the inoculant based on the calculation result.

[0002]

2. Description of the Related Art There is widely known a technique for maintaining a desired quality of a cast product by mixing a small amount of a metal material or an alloy material as an inoculant in cast iron. The composition of the inoculant depends on the type of casting to be produced and the specifications of the customer, and is prepared each time the process is entered or whenever the cast iron is supplied. Heretofore, a skilled worker had to work carefully so that there was no error in the weighing and blending.

[0003] Here, inoculation refers to the physical and physical processes beyond the effect of alloying by adding a small amount of metal or alloy into the molten metal poured into the mold during the casting operation of cast iron. Refers to a process that gives a chemical change. The metallurgical meaning is to give the melt a “seed” or “crystal nucleus” for the solid phase that grows during solidification, and, phenomenally, to promote heterogeneous nucleation and reduce the graphite crystallization state. They are trying to improve. It varies slightly depending on the inoculant, processing conditions, and time, but is used to improve the material, such as reducing the thickness sensitivity by increasing the number of graphite eutectic cells and improving the machinability by preventing the generation of cementite.

[0004]

However, even if a skilled worker works carefully, mistakes in the blending may occur, and a skilled worker may not always be able to assign a skilled worker to the blending worker. . Once a mixing error occurs, many defective products will be manufactured. Further, the work for this compounding may involve a confirmation work by a plurality of workers, and the drawback is that the number of working steps is large.

The present invention is an improvement of the present invention, in which the operation is extremely simplified, the components are automatically analyzed from the cooling characteristics of the molten metal to be measured, and the type and amount of the inoculant to be added are set and the weighing is performed. It is an object of the present invention to provide an apparatus that can reduce errors and reduce the number of work steps.

[0006]

According to the present invention, there is provided a cooling characteristic measuring apparatus for storing a molten metal to be measured and transmitting the cooling characteristic of the molten metal as an electric signal. Molten metal component analyzer to be sent out,
A control device having a calculating device for taking in the analysis result and calculating the type and amount of inoculum to be added to the analysis result, and a type of inoculant specified in the calculation result by taking in the calculation result of the calculation device And a material weighing device for cutting out the amount.

[0007] The molten metal component analyzer includes means for converting a carbon equivalent value (CE value) into an analysis result from the cooling characteristic,
The control device includes a storage circuit, and the type of the inoculant to be added is stored in the storage circuit in advance by holding the type and amount of the inoculant to be added corresponding to the carbon equivalent value in a table, and referring to this table. And a means for calculating the amount, and further, the material weighing device is arranged with a plurality of hoppers in which a plurality of types of inoculants are individually accumulated, provided at an outlet of the hopper, and provided from the control device. Cutting means for cutting out the material accumulated in the hopper in response to the control signal, and an inoculum which is moved near the outlets of the plurality of hoppers in response to a drive signal from the control device and cut out from the outlet of the hopper. A receiving cup, and weighing means for weighing the weight of the cup and outputting the weighed value as an electric signal, wherein the control device comprises: an input means; It is desirable that only the weight specified type of inoculant was designated respectively by signals applied to means comprises control means for cutting the said cup.

[0008]

The cooling characteristic measuring device measures the cooling characteristic of the molten metal to be measured and sends it out as an electric signal. The molten metal component analyzer takes in the electric signal, analyzes the molten metal component, and sends out the result as an electric signal. The arithmetic unit calculates the type and amount of the inoculant to be taken in by taking in the analysis result, and the material weighing unit cuts out the inoculation and the amount specified by the calculation result.

The cutting of the inoculant by the material weighing device is performed under the control of the control device. The control device sends a drive signal to a motor that moves the cup, moves the cup to the position of the first material and stops it, and subsequently sends a control signal to operate the cutting means of the hopper of the first material, An electric signal indicating the weighed value is taken in and monitored, and when the increment of the weighed value reaches a preset value, the operation of the extracting means is stopped. Next, the cup is moved to the position of the hopper of the second material and stopped, and the cutout means of the hopper is controlled while monitoring the weighed value. When cutting is completed for all the materials by repeating such an operation, a signal indicating completion of cutting is displayed.

[0010] The operator confirms the signal of completion of the cutting, takes out the inoculated material cut out from the cup, stirs it, and mixes it with a predetermined cast iron material. In this way, the process from setting to cutting of a plurality of types of inoculants can be automatically performed by a simple input operation based on the cooling characteristics of the raw material to be cast. In addition, the reliability of the work process can be improved, and the number of work steps can be reduced.

[0011]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.
FIG. 1 is a diagram showing a configuration of a material weighing device according to an embodiment of the present invention,
FIG. 3A is a front view of a material weighing apparatus and hopper equipment in the apparatus according to the embodiment of the present invention, and FIG. 3B is a side view thereof.

As shown in FIG. 1, in the embodiment of the present invention, a cooling characteristic measuring apparatus 1 for containing a molten metal to be measured and transmitting its cooling characteristic as an electric signal, taking in the electric signal, analyzing the molten metal component, and analyzing the result of the analysis. And a control unit 4 having an arithmetic unit 3 for taking in the analysis result and calculating the type and amount of the inoculant to be added to the analysis result, and the arithmetic unit 3 And a material weighing device 10 for taking in the result of the calculation and cutting out the type and amount of the inoculant designated in the result of the calculation.

Further, the molten metal component analyzer 2 includes means for obtaining a carbon equivalent value (CE value) from the cooling characteristics as an analysis result, the controller 4 includes a storage circuit 5, and the arithmetic unit 3 includes the storage circuit. 5 is provided with a table 5a which stores in advance the type and amount of inoculant to be added corresponding to the carbon equivalent value and calculates the type and amount of inoculant to be added by referring to this table 5a.

As shown in FIGS. 2 and 3, the material weighing device 10 includes a plurality of hoppers 11 in which a plurality of types of inoculants (powder materials) are individually stored.
A cutting means 12 provided at the outlet of the hopper 11 for cutting out the material stored in the hopper 11 in response to a control signal from the control device 4; A cup 14 for receiving the inoculum, which is moved accordingly and cut out from the corresponding outlet of the hopper 11, and a weighing means 15 for weighing the weight of the cup 14 and outputting the weighed value as an electric signal. An input means for receiving an electric signal through an interface, and a cup 1 containing an inoculum of the type specified by the signal given to the input means, each of the weight being specified.
4 is provided.

Next, the operation of the embodiment of the present invention configured as described above will be described. FIG. 4 is a diagram showing a flow of an automatic inoculation weighing operation by the apparatus of the embodiment of the present invention.

The molten metal to be measured melted in the electric furnace is sampled and accommodated in the cooling characteristic measuring device 1 to measure the cooling characteristic including the solidification starting point and the solidification completion point. The measurement result is sent to the molten metal component analyzer 2 as an electric signal. The molten metal component analyzer 2 takes in the electric signal, analyzes the molten metal component, determines a carbon equivalent value (CE value) from cooling characteristics, and controls as an electric signal. It is sent to the arithmetic unit 3 of the device 4.

The arithmetic unit 3 takes in the analysis result and calculates the type and amount of the inoculant to be added to the analysis result. This calculation is performed with reference to the type and amount of the inoculant to be added corresponding to the carbon equivalent value recorded in advance in the table 5a provided in the storage circuit 5.
An example is shown in FIG. In this example, the carbon equivalent value is 0 to 13
Are determined in advance, and the pattern corresponding to the result of the molten metal component analysis is determined, and the calculation is performed in accordance with the inoculant set for each pattern and the addition rate. The result calculated in this way is the material weighing device 10
And the material weighing device 10 selects the type of inoculant specified in the calculation result and cuts out the specified amount.

The cut-out by the material weighing device 10 is performed by, for example, compounding types shown in [Table 1].
Contains 230 g, C contains 460 g, and D contains 120 g. According to the compounding type II, material A has 160 g, B has 50 g, and C has 16
0g and 100g of E are contained.
Is 110 g, B is 50 g, C is 110 g, D is 50 g,
E contained 50 g, and in the compounding type IV, the material A contained 120 g.
Assuming that g and C are contained in 120 g, the “combination type I”
Is designated and a drive signal is sent from the control device 4 to the drive device 24, the drive device 24 drives the motor 23 by the drive signal and moves the cup 14 moved by the drive screw 22.
Is moved to, for example, a position corresponding to the popper 11 in which the material A is stored and stopped. Inocula include, for example, S
b, Inogura G, CaSi, FeCr, carbon and the like.

When the position sensor 25 detects that the cup 14 has stopped at the position of the material A and the detection signal is transmitted, the control device 4 transmits a control signal to the cutting means 12, and the material A is Cutting means 12 of stored hopper 11
Drive. The material A is cut out from the hopper 11 into a cup 14, the weighing means 15 weighs the cut out material A, and sends an electric signal indicating the weighed value to the control device 4.

The control device 4 monitors while taking in the electric signal, and when the weighing increment reaches a preset value (230 g), stops the operation of the cutting means 12. Thus, the cutting of the material A is completed.

Subsequently, a drive signal for moving the cup 14 to the position of the hopper 11 of the material C required for the "mixing type I" is sent to the driving device 24, and the motor 23 is driven to move the cup 14 to the material. Move to a position corresponding to the hopper 11 in which C is stored and stop.

When a detection signal indicating that the cup 14 has stopped is sent from the position sensor 25, the control device 4 sends a control signal to cut out the hopper 11 for the material C, as in the case of the material A. 12 is driven. The material C is cut out from the hopper 11 into a cup 14, and the weighing means 15 weighs the cut out material C, and sends an electric signal indicating the weighed value to the control device 4.

The control device 4 monitors while taking in the electric signal, and the weighing increment is set to a preset value (46).
0g), the operation of the cutting means 12 is stopped, and the cutting of the material C is terminated.

Thereafter, the above operation is repeated to cut out the material D, and when the cutting of all the materials is completed, the completion of the cutting is displayed. The operator transfers the inoculum cut out of the cup 14 to the ladle 21 and mixes it with the raw iron material.

[0025]

[Table 1] FIG. 6 shows a comparison of weighing accuracy between the embodiment of the present invention and the conventional example, where (a) shows the weighing accuracy of ferrochrome.
(B) shows the measurement accuracy of inoculin, and (c) shows the measurement accuracy of calsil. In the figure, N is the number of samples, [1] is the average value, and σ is the standard deviation.

[0026]

[Outside 1] In the case of ferrochrome, as shown in FIG.
In the conventional example, the average value of the sample 20 was 2.504 and the standard deviation was 0.09 as a result of measurement. However, when the sample 30 was measured by the apparatus of the present invention, the average value was 2.39, The standard deviation is 0.012, and the deviation of the center of the distribution of the measured values is greatly reduced.

In the case of inoculin, FIG.
As shown in (b), in the conventional example, as a result of weighing the sample 20, the average value was 1.052, and the standard deviation was 0.041.
Was measured for the sample 30 by the apparatus of the present invention, the average value was 1.052, and the standard deviation was 0.00.
5, which also shifts at the center of the distribution, but the variation is reduced.

Further, in the prior art, the average value of the sample 20 was 1.102 and the standard deviation was 0.045 when the sample 20 was weighed. However, according to the apparatus of the embodiment of the present invention, the average value of the sample 30 was 1 .204, standard deviation 0.
017, the center of the distribution is shifted, but the variation is greatly reduced.

As described above, it is shown that the variation is reduced in any of the weighing, and the weighing accuracy is improved.

FIGS. 7 (a) and 7 (b) show a comparison of the hardness and tensile strength of the cast products manufactured by the measurement according to the embodiment of the present invention and the conventional apparatus.

In the case of hardness, as shown in FIG. 2A, the average value of 4.08 and the standard deviation of 0.138 were measured for the sample 23 calculated and cast in the conventional example. Sample 3 calculated and cast by the apparatus of the embodiment of the invention
3, the average value is 4.07 and the standard deviation is 0.082, and the variation is reduced without substantially changing the center of the distribution.

As for the tensile strength, the measurement result of the sample 82 weighed and cast by the conventional apparatus is an average value of 31.02,
Although the standard deviation was 1.706, the measurement result of the sample 32 weighed and cast by the apparatus of the embodiment of the present invention was an average value of 30.99 and a standard deviation of 1.382. Almost unchanged, the variability is decreasing.

As described above, when the measurement is performed with high accuracy, the variation in hardness and tensile strength when cast is reduced, and the production quality can be improved.

[0034]

As described above, according to the present invention, the analysis of the iron material for casting, the calculation of the addition amount of the inoculant mixed with the iron material, and the cutting of the inoculant based on the calculation result are all automatically performed. In addition, since the type and amount of inoculant are set based on the analysis result of the raw iron material, the setting and weighing are performed with high accuracy, and the quality and reliability of the cast product are improved. This has the effect that the number of work steps can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a material weighing device according to an embodiment of the present invention.

FIG. 3A is a front view of a material weighing device and a hopper facility according to an embodiment of the present invention, and FIG. 3B is a side view thereof.

FIG. 4 is a diagram showing a flow of an automatic inoculation weighing operation by the apparatus according to the embodiment of the present invention.

FIG. 5 is a diagram showing an example of an inoculant addition rate standard in an example of the present invention.

6 (a), (b), and (c) are diagrams showing a comparison of weighing accuracy between the embodiment of the present invention and the conventional apparatus.

FIGS. 7 (a) and (b) are diagrams showing a comparison of hardness and tensile strength of a cast product manufactured by weighing with the examples of the present invention and the conventional apparatus.

DESCRIPTION OF SYMBOLS 1 Cooling characteristic measuring device 2 Molten component analyzing device 3 Computing device 4 Control device 5 Storage circuit 5a Table 10 Material weighing device 11 Hopper 12 Cutting means 14 Cup 15 Weighing means 21 Hand ladle 22 Drive screw 23 Motor 24 Drive device 25 Position sensor

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B22D 1/00 B22D 27/20

Claims (3)

(57) [Claims] 1. A cooling characteristic measuring device for containing a molten metal to be measured and transmitting its cooling characteristic as an electric signal, a molten metal component analyzing device for capturing the electric signal, analyzing the molten metal component, and transmitting an analysis result as an electric signal; A control device having a calculating device for taking in the analysis result and calculating the type and amount of inoculum to be added to the analysis result, and a type of inoculant specified in the calculation result by taking in the calculation result of the calculation device And a material weighing device for cutting out an amount. 2. The molten metal component analyzer includes means for converting a carbon equivalent value (CE value) into an analysis result based on the cooling characteristics. The controller includes a storage circuit, and the storage circuit stores a carbon equivalent value in advance. 2. The automatic inoculation weighing system according to claim 1, further comprising means for holding the type and amount of the inoculant to be added as a table in accordance with the table and calculating the type and amount of the inoculant to be added with reference to the table. apparatus. 3. The material weighing device according to claim 1, wherein a plurality of hoppers in which a plurality of types of inoculants are individually accumulated are arranged, and the hopper is provided at an outlet of the hopper, and is provided to the hopper in response to a control signal from the control device. A cutting means for cutting out the accumulated material, a cup which moves near the outlets of the plurality of hoppers in response to a drive signal from the control device and receives an inoculum cut out from the outlet of the hopper, and a weight of the cup. Weighing means for weighing and outputting the weighed value as an electric signal, wherein the control device comprises an input means and an inoculum of a type designated by a signal given to the input means, each of which is designated by the designated weight. The automatic inoculant weighing device according to claim 1, further comprising control means for cutting into cups.