Casting method

Abstract

The present invention provides a casting method that can suppress the temperature drop of the material during the roll forming process, which is a pre-forming step. [Solution] The casting method according to the present disclosure is a casting method comprising a roll forming step in which a material to be cast is roll-formed using a roll mold 10 heated by a heater 11, and a quenching step in which the material is quenched, wherein in the roll forming step, the temperature of the roll mold 10 is maintained at 400°C or higher by the heater 11.

Description

Technical Field

[0001] This disclosure relates to a casting method.

Background Art

[0002] When manufacturing a metal casting part, the material used for casting is preformed before the casting process. For example, in Patent Document 1, roll forming is performed as the preforming.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Regarding the roll forming disclosed in Patent Document 1, the inventor has found the following problems. Since the contact time between the material and the roll die in roll forming is long, the amount of heat transferred from the material to the roll die is large, and the temperature of the material decreases. Therefore, when the material enters the quenching process after roll forming, it is at a lower temperature than the required temperature, and the time for the quenching process becomes longer.

[0005] The present invention has been made to solve such problems, and an object thereof is to provide a casting method capable of suppressing a temperature drop of a material in a roll forming process, which is a preforming process.

Means for Solving the Problems

[0006] The casting method according to the present disclosure is a casting method including a roll forming step of roll forming a material to be cast by a roll die heated by a heater, and a quenching step of quenching the material, wherein in the roll forming step, the temperature of the roll die is maintained at 400°C or higher by the heater.

Effects of the Invention

[0007] The present invention provides a casting method that can suppress the temperature drop of the material during the roll forming process, which is a pre-forming step. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a flowchart of the casting method according to Embodiment 1. [Figure 2] Figure 2 is an explanatory diagram showing the roll mold used in the roll forming process according to Embodiment 1. [Figure 3] Figure 3 shows the temperature changes of the workpiece in the flow of the casting method according to Embodiment 1. [Modes for carrying out the invention]

[0009] The following describes specific embodiments of this disclosure in detail with reference to the drawings. However, this disclosure is not limited to the following embodiments. Also, for clarity, the following descriptions and drawings have been simplified as appropriate.

[0010] (Embodiment 1) <Casting Method> First, the casting method according to Embodiment 1 will be described with reference to Figures 1 and 2. Figure 1 is a flowchart of the casting method according to Embodiment 1. Note that the order of the steps is not limited to this and may be rearranged as appropriate. Figure 2 is an explanatory diagram showing the roll mold used in the roll forming process according to Embodiment 1.

[0011] As shown in Figure 1, the casting method according to this embodiment 1 comprises a solution treatment step (step S101), a roll forming step (step S102), a crushing step (step S103), a rough forming step (step S104), a finish forming step (step S105), a quenching treatment step (step S106), and an aging treatment step (step S107).

[0012] In the pre-forming roll forming process (step S102), as shown in Figure 2, the workpiece W, which is the material to be cast, is conveyed and pressurized as a pair of roll molds 10 rotate. In this embodiment, the workpiece W is roll-formed using roll molds 10 equipped with heaters 11. At this time, the heaters 11 heat the roll molds 10 so that the temperature of the roll molds 10 is maintained at 400°C or higher. This suppresses the loss of heat from the workpiece W to the roll molds 10, i.e., the decrease in the temperature of the workpiece W. Therefore, the necessary temperature of the workpiece W can be maintained in the quenching process (step S106), and the time required for the quenching process (step S106) can be shortened.

[0013] The heater 11 shown in Figure 2 is located on the surface or inside the roll mold 10, but is not limited to this. The heater 11 may be located at a distance from the roll mold 10.

[0014] The material of the workpiece W is not particularly limited as long as it is a castable metal. For example, carbon steel, alloy steel, aluminum alloy, copper, titanium, magnesium, etc. may be used as the material of the workpiece W. In addition, although the roll mold 10 is heated to maintain a temperature of 400°C or higher in the above description, the temperature of the roll mold 10 may be changed depending on the material of the workpiece W.

[0015] <Examples> The following describes an example of the casting method according to Embodiment 1. Figure 3 is a diagram showing the temperature changes of the workpiece in the flow of the casting method according to Embodiment 1. The dashed line in Figure 3 represents an example in which the roll forming process (step S102) of the workpiece W is performed using a roll mold 10 heated by the heater 11. On the other hand, the solid line in Figure 3 represents a comparative example in which the roll forming process (step S102) of the workpiece W is performed using a roll mold 10 that is not heated by the heater 11. Note that the implementation conditions other than whether or not the roll mold 10 is heated are the same for the example and the comparative example.

[0016] In the comparative example shown by the solid line in FIG. 3, it can be confirmed that the temperature of the workpiece W drops rapidly in the roll forming process (step S102). On the other hand, in the embodiment shown by the broken line in FIG. 3, since the workpiece W is roll processed using the roll die 10 heated by the heater 11 in the roll forming process (step S102), it can be confirmed that the temperature drop of the workpiece W is suppressed. Therefore, the temperature of the workpiece W when entering the quenching process (step S106) is higher in the embodiment shown by the broken line in FIG. 3 than in the comparative example shown by the solid line in FIG. 3.

[0017] As described above, in the casting method according to Embodiment 1, in the roll forming process (step S102) which is a preforming process, the workpiece W is roll formed using the roll die 10 provided with the heater 11. At this time, the heater 11 heats the roll die 10 so that the temperature of the roll die 10 becomes 400°C or higher. Thereby, the heat loss from the workpiece W to the roll die 10, that is, the temperature drop of the workpiece W can be suppressed. Therefore, since the temperature of the workpiece W required in the quenching process (step S106) can be maintained, the time required for the quenching process (step S106) can be shortened.

[0018] Note that the present invention is not limited to the above embodiments, and can be appropriately modified without departing from the gist.

Explanation of Reference Numerals

[0019] 10 Roll die 11 Heater W Workpiece

Claims

[Claim 1] The roll forming process involves using a roll mold heated by a heater to roll-form the material to be cast, A casting method comprising a quenching step of quenching the aforementioned material, In the roll forming process, the temperature of the roll mold is maintained at 400°C or higher by the heater. Casting method.

Images