Method for suppressing casting burr

Abstract

To suppress the occurrence of burrs in each shot when continuous casting is performed.SOLUTION: There are provided: molds 11 which form parting lines and face each other; a main mold 12 which is provided on the back side of the mold 11; a heat insulating part 13 which is provided between the mold 11 and the main mold 12 and performs heat insulation; a deformation part 14 which is provided between the heat insulating part 13 and the main mold 12 and extrudes the mold 11; and a measurement part 15 which measures a gap between the facing molds. A method for suppressing casting burr comprises the steps in which: the measurement part 15 measures the amount of gap between the facing molds 11; and the deformation part 14 is deformed according to the measured amount of gap.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a method for suppressing casting burrs during casting using a mold. [Background technology]

[0002] In recent years, in order to prevent the occurrence of gaps due to deformation during casting of the opposing parting line (PL) surfaces of molds that are combined to form a pair, the surface pressure acting on the corresponding PL surface during casting has been calculated, and the PL surface is molded into a concave shape based on the calculated surface pressure.

[0003] As a result, even if the PL surface is deformed during casting, the concave mold expands, causing the PL surface to take a convex shape, thereby preventing gaps from occurring at the mating surfaces of the mold. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2012-091183 A Summary of the Invention [Problem to be solved by the invention]

[0005] In such casting, casting is performed continuously. The temperature distribution differs depending on the number of continuous castings. For example, even when 100 continuous castings are performed, the heat accumulation in the first shot is small and the heat accumulation in the 100th shot is large, and the deformation and surface pressure differ depending on the magnitude of the heat accumulation, so the amount of gap on the PL surface also differs for each shot. Here, the mold design device described in Patent Document 1 is expected to suppress the occurrence of burrs in the temperature field of a certain shot, but the effect of suppressing the occurrence of burrs in another shot is considered to be limited. Therefore, there has been a demand for suppressing the occurrence of burrs even when casting is performed continuously.

[0006] The present disclosure provides a casting burr suppression method for suppressing the occurrence of burrs in each shot when casting is performed continuously. [Means for solving the problem]

[0007] The casting burr suppression method according to the present disclosure includes opposing dies forming a parting line, a master die provided on the back side of the dies, an insulating section provided between the dies and the master die and providing insulation, a deformation section provided between the insulating section and the master die and performing deformation to push out the dies, and a measurement section measuring a gap between the opposing dies, and includes the steps of: measuring an amount of the gap between the dies by the measurement section; and deforming the deformation section in accordance with the measured amount of the gap. This makes it possible to reduce the amount of gap between the opposing dies by pushing out the dies through deformation of the deformation portion provided on the rear side of the dies. Effect of the Invention

[0008] According to the present disclosure, it is possible to provide a casting burr suppression method that suppresses the occurrence of burrs in each shot when casting is performed continuously. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram showing an example of the arrangement of a casting device according to a first embodiment. [Diagram 2] FIG. 3 is a diagram showing an operation flow for suppressing casting burrs by the casting device according to the first embodiment. [Diagram 3] FIG. 1 is a diagram of a casting apparatus having a split mold. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] First embodiment Hereinafter, a casting apparatus 1 according to the present embodiment will be described with reference to the drawings. As shown in Fig. 1(a), the casting apparatus 1 includes a mold 11, a master mold 12 disposed on the rear side of the mold 11, a heat insulating section 13 provided between the mold 11 and the master mold 12, a deformation section 14 provided between the mold 11 and the master mold 12, a measurement section 15, a calculation control section 16, and a heating section 17. As shown in Fig. 1(a), in the casting apparatus 1, a gap is formed on the PL surface formed between the opposing molds 11, and the opposing side also has a similar structure including the mold 11, the master mold 12, the heat insulating section 13, and the deformation section 14, so its description is omitted.

[0011] 1(a) and 1(b) are diagrams showing an example of a cross section of the mold 11, main mold 12, heat insulating section 13, and deformation section 14 in the casting apparatus 1, but some hatching has been omitted to avoid making the diagram difficult to understand. Furthermore, in Fig. 1(a), the casting apparatus 1 is shown as having a measurement section 15, a calculation control section 16, and a heating section 17, which are shown as functional blocks, but are omitted in Fig. 1(b).

[0012] As shown in Fig. 1(a), the mold 11 is a pair of opposing molds 11, and is the part that comes into contact with the molded product. For the sake of simplicity, it is assumed that the centers of the molds 11 are particularly close to each other, and that there are gaps between the upper ends and between the lower ends. Here, based on the description of Fig. 1(a), the explanation will be given with a focus on the mold 11 etc. arranged on the right side.

[0013] In the following, the front side of the mold 11 is the side where the parting line with the opposing mold is provided, and is taken to be the left side in Fig. 1(a). On the other hand, the back side of the mold 11 is the right end face side of the mold 11 shown in Fig. 1(a), and the main mold 12 is disposed on the right side of the mold 11, i.e., in the back direction.

[0014] The master mold 12 is a fixed part disposed on the rear side of the metal mold 11, and is a mold that surrounds the outside of the object to be molded by casting.

[0015] The heat insulating section 13 is disposed between the back surface of the mold 11 and the main mold 12. Specifically, the heat insulating section 13 is disposed in a state of being thin in the left-right direction while being in contact with the mold 11 on the back side of the mold 11 at the upper side where a gap is generated between the opposing molds 11 and on the back side of the mold 11 at the lower side, and these thin portions in the left-right direction are referred to as heat insulating sections 13a.

[0016] The heat insulating portion 13 is provided thick in the left-right direction in the center in the up-down direction where no gap is generated between the molds 11 and the main mold 12. This portion is referred to as heat insulating portion 13b.

[0017] The deformation section 14 is provided between the mold 11 and the master mold 12, between the heat insulating section 13a and the master mold 12, and has a structure that expands or contracts. As described later, the deformation section 14 deforms in accordance with the size of the gap between the opposing molds 11 measured by the measuring section 15 so as to impart a deformation amount equivalent to the gap amount.

[0018] Here, the deformation section 14 is deformed in the left-right direction, i.e., so that the distance between the die 11 and the master die 12 increases, by applying heat from the heating section 17 in accordance with the measurement results of the measurement section 15. Fig. 1(b) is a diagram showing a state in which a part of the die 11 is pushed out by the deformation of the deformation section 14. At this time, since the master die 12 in the casting device 1 has high rigidity, when a force that expands in the front-back direction, i.e., in the left-right direction, occurs in the deformation section 14, the deformation section 14 extends to the left side, which is the front side, and the die 11 is pushed out.

[0019] Here, the amount of deformation in the left-right direction of the deforming portion 14 may be a maximum of about 0.5 mm, assuming that the gap between the opposing dies 11 will be about 0.4 mm, and the material and structure can be changed as appropriate.

[0020] Although the deformation section 14 is described as being arranged between the insulating section 13a and the main mold 12, this can be rephrased as the insulating section 13a being arranged between the mold 11 and the deformation section 14.

[0021] The measuring unit 15 measures the gap amount between the pair of opposing dies 11. Here, the measuring unit 15 outputs the measured gap amount to the calculation control unit 16. The measuring unit 15 can measure the gap amount, temperature, contact surface pressure, etc., but the measurement targets are not limited to these.

[0022] The calculation control unit 16 judges whether or not the gap between the dies 11 measured by the measurement unit 15 is within a set value. Furthermore, when the gap between the dies 11 measured by the measurement unit 15 is out of the set value and an operation is performed to fill the gap by deforming the deformation unit 14, the calculation control unit 16 calculates the amount of heat to be applied from the heating unit 17 to deform the deformation unit 14 from the measured gap between the dies 11.

[0023] Heating unit 17 is a heat source that applies heat to deformation unit 14. More specifically, heating unit 17 operates according to the control of calculation control unit 16 so that deformation unit 14 undergoes deformation equivalent to the measured gap amount.

[0024] Next, a description will be given of an example of the operation of the casting apparatus 1. Fig. 2 is a diagram showing an example of the operation flow of the casting apparatus 1.

[0025] The measuring unit 15 measures information about the molds 11 and identifies the amount of gap between the opposing molds 11 (step S1).

[0026] The calculation control unit 16 judges whether the gap amount measured by the measurement unit 15 is within a preset value (step S2). If the gap amount is within the set value (Yes in step S2), the process ends. If the gap amount is out of the set value (No in step S2), the process proceeds to step S3.

[0027] The arithmetic and control unit 16 sets a deformation control area (step S3). In other words, the arithmetic and control unit 16 determines which of the deformation units 14 should receive heat from the heating unit 17 to cause deformation.

[0028] The calculation and control unit 16 controls the deformation unit 14 to deform to an amount equivalent to the gap amount (step S4). That is, the calculation and control unit 16 controls the operation of the heating unit 17 to apply heat to the deformation unit 14 set in step S3.

[0029] As a result, the deformed portion 14 expands and pushes out the mold 11 at the location where a gap was generated between the opposing molds 11. Therefore, the opposing molds 11 move in directions approaching each other, eliminating the gap.

[0030] Since the heat insulating portion 13a is disposed between the mold 11 and the deformation portion 14, even if the deformation portion 14 is heated, the heat is not transferred to the mold 11.

[0031] As a result, in the casting apparatus 1, by utilizing the deforming portion 14, which is a deformable structure, gaps between the dies 11 that occur with each casting shot can be filled, and casting burrs can be suppressed.

[0032] In the casting apparatus 1, it is possible to deform only the target structure, and it is possible to keep the mold 11 that comes into contact with the casting from being thermally deformed.

[0033] Furthermore, the casting apparatus 1 has a deforming part 14 that is separate from the mold 11 where burrs are generated, which allows for localized response. That is, in the casting apparatus 1, in places where there is a gap between the opposing molds 11, the deforming part 14 can deform to eliminate the gap, while at the same time, in places where there is no gap, the deforming part 14 is not deformed, so that it is possible to avoid any influence.

[0034] The present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the spirit of the present invention. In other words, the above description has been omitted or simplified as appropriate for the purpose of clarity, and a person skilled in the art can easily modify, add, or convert each element of the embodiment within the scope of the present invention.

[0035] In the above description, the deformation portions 14 are provided only at two locations on the rear side of the mold 11, but a greater number of deformation portions 14 can be arranged.

[0036] Further, the deformation of the deformation portion 14 has been described as being caused by thermal control of heating from the heating portion 17, but this is not limiting, and physical control of the amount of change may be performed.

[0037] More specifically, aluminum steel material with a large thermal expansion coefficient can be used for the deformation portion 14, and a mechanical, liquid-operated, or air-operated jack can be used for physical control. In addition, the thermal control device can use a temperature control circuit using hot water or oil for heat input, a cooling circuit using cold water or air for heat removal, and a Persier element connected to an electric circuit for heat input and removal, but is not limited to these.

[0038] Furthermore, as shown in FIG. 3, even when the mold 11 is divided into several parts, by providing a deformation portion 14 on the back side of each divided mold 21, the gap between the opposing molds can be filled in the same manner.

[0039] In particular, in the case of split dies, the heat amount held by the dies themselves is likely to differ due to differences in the cooling, volume, and physical properties of the dies. As a result, the amount of pushing against each other differs, and a significant gap between the opposing dies may occur. However, by arranging the deformation parts 14 corresponding to the positions of the respective dies and changing the deformation amount according to the gap amount, it is possible to appropriately suppress the occurrence of the gap. [Explanation of symbols]

[0040] 1 Casting equipment 11 Mold 12 Main Type 13 Insulation section 13a Insulation section 13b Insulation section 14 Deformation section 15 Measuring part 16 Calculation control unit 17 Heating section

Claims

[Claim 1] A mold that faces each other and forms a parting line; A master mold provided on the back side of the mold; a heat insulating section provided between the die and the master die for heat insulation; a deformation section that is provided between the heat insulating section and the main mold and deforms to push out the mold; A measuring unit that measures the gap between the opposing dies, a step of the measuring unit measuring the gap amount of the mold; and deforming the deformation portion according to the measured gap amount. Cast burr suppression method.

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