JP2019093414A - Method for forming a paint layer - Google Patents

Abstract

To provide a method for forming a coating layer which is not easily worn even when a mold is repeatedly used. In a method for forming a coating layer according to an aspect of the present invention, a mixed powder 3 placed on a surface 2a of a heated mold 2 is pressurized and pressed against the surface 2a of the mold 2. It is a formation method of the coating type layer provided with the pressurization process (step S2). The mixed powder 3 contains a coating material and carbon, and forms a coating layer 31b on the surface 2a of the mold 2 by reacting the coating material in the pressurizing step (step S2). [Selection] Figure 1

Description

  The present invention relates to a method of forming a moldable layer.

For example, a coating layer is formed on the surface of a mold used for low pressure casting or the like to improve the function of the mold.
Patent Document 1 discloses a method of applying a moldable material to the surface of a mold using a spray gun to form a moldable layer.

JP, 2011-212714, A

The inventor has found the following problems with the method of forming a mold-coating layer.
In the method of forming the mold coating layer disclosed in Patent Document 1, the mold coating material is applied under atmospheric pressure. However, when the mold is used repeatedly, the mold coating layer is worn away, and the heat retention and air permeability of the mold are reduced.

  The present invention has been made in view of such problems, and it is an object of the present invention to provide a method for forming a coated layer capable of suppressing the abrasion of the coated layer when the mold is repeatedly used. .

  The method for forming a mold-forming layer according to an aspect of the present invention includes the step of pressing the mixed powder placed on the surface of the heated mold and pressing the mixed powder against the surface of the mold, The mixed powder contains a mold wash and carbon, and in the pressing step, the mold wash is reacted to form a mold wash layer on the surface of the mold.

  In the method for forming a mold coating layer according to the present invention, in the pressing step, the mold coating material is reacted to form the mold coating layer on the surface of the mold. When the coating material is reacted, a chemical bond is formed between the surface of the mold and the mold and between the molds in the mold layer. Therefore, the moldable layer formed in the pressing step is stronger than the moldable layer formed using a spray gun or the like, and the wear of the moldable layer is suppressed when the mold is repeatedly used. it can.

  ADVANTAGE OF THE INVENTION According to this invention, the formation method of the mold-coating layer which can suppress abrasion of the mold-coating layer at the time of using a metal mold | die repeatedly can be provided.

It is sectional drawing of the formation apparatus of the mold-coating layer which concerns on embodiment. It is a flowchart of the formation method of the mold-coating layer which concerns on embodiment. It is sectional drawing of the formation apparatus of the mold-coating layer which concerns on embodiment.

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments. Further, in order to clarify the explanation, the following description and the drawings are simplified as appropriate.

First, with reference to FIG. 1, the structure of the apparatus (formation apparatus of a mold-coating layer) for enforcing the formation method of the mold-coating layer which concerns on this Embodiment is demonstrated.
FIG. 1: is sectional drawing of the formation apparatus of the mold-coating layer which concerns on embodiment. As shown in FIG. 1, the device for forming a mold layer 1 includes a heater 4 and a pressure vessel 5. In the cross-sectional view of FIG. 1, the mold 2, the mixed powder 3, and the moldable layer 31 b are also illustrated.

  As a matter of course, the right-handed system xyz orthogonal coordinates shown in FIG. 1 and the other drawings are convenient for describing the positional relationship of components. Usually, the positive z-axis direction is vertically upward, and the xy plane is a horizontal plane, which is common to the drawings.

  The pressure vessel 5 has a main body 51 and a lid 52. Specifically, the main body 51 is a tubular structure extending in the z-axis direction (longitudinal direction). The main body 51 has a bottom on the z-axis negative direction side (lower side) and an open end on the z-axis positive direction side (upper side). The bottom of the main body 51 is a plane parallel to the xy plane (in other words, a plane perpendicular to the longitudinal direction of the main body 51).

  The lid 52 is inserted from the open end and fitted to the inner peripheral surface of the main body 51. The lid 52 is a plate-like member that can slide along the inner wall of the main body 51 and is parallel to the xy plane. The edge of the lid 52 is always in contact with the inner wall of the main body 51, and the atmosphere in the main body 51 is sealed using the lid 52. Therefore, as shown in FIG. 1, when the lid 52 is slid in the arrow direction (z-axis negative direction), the atmosphere in the main body 51 is pressurized.

  The heater 4 is placed in the main body 51. The place where the heater 4 is placed is not particularly limited as long as it is in the main body 51, but for example, as shown in FIG. 1, the heater 4 is placed in contact with the bottom of the main body 51.

  The mold 2 is placed on the heater 4. When the heater 4 is heated, heat is transferred to the mold 2 and the mold 2 is heated. Although details will be described later, a moldable layer is formed on the surface 2 a of the mold 2. Therefore, it is preferable that the mold 2 be placed such that the surface 2 a is in contact with the mixed powder 3. For example, as shown in FIG. 1, it is preferable that the mold 2 be placed so that the surface 2a faces the z-axis positive direction side. The mold 2 is configured using, for example, steel.

The mixed powder 3 is placed on the mold 2. The mixed powder 3 contains a mold material and carbon. The mold wash is, for example, a powdered inorganic compound selected from silicon dioxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ), and magnesium oxide (MgO). Moreover, carbon is a particle comprised using graphite.

  Next, with reference to FIG. 2, a method of forming a mold coating layer according to the present embodiment will be described. FIG. 2 is a flowchart of the method for forming a mold layer according to the present embodiment.

  First, as shown in FIG. 1, a step (step S1) of heating the mold 2 using the heater 4 in the pressure vessel 5 is performed. Specifically, the lid 52 is fitted to the main body 51 in which the heater 4, the mold 2, and the mixed powder 3 are disposed, and the atmosphere in the main body 51 is sealed. When performing step S1, for example, nitrogen gas is used as an atmosphere in the main body portion 51. Nitrogen gas is injected into the main body 51 using, for example, a pump (not shown). With the nitrogen gas injected into the main body 51, the heater 4 is heated to heat the mold 2 to approximately 1400 ° C. The heat of the heated mold 2 is transmitted to the mixed powder 3 to heat the mixed powder 3 located in the vicinity of the mold 2. Since nitrogen gas is used as the atmosphere, almost no oxygen gas is present in the main body 51. Therefore, the carbon contained in the mixed powder 3 does not burn even if it is heated in step S1.

  Next, the mixed powder 3 placed on the surface 2 a of the heated mold 2 is pressurized, and a pressing step (step S 2) is performed to press the mixed powder 3 against the surface 2 a of the mold 2. Specifically, the lid 52 is slid in the z-axis negative direction to press the inside of the main body 51. Then, the mixed powder 3 is pressurized in the main body 51 and pressed against the surface 2 a of the mold 2. In particular, since the mixed powder 3 located in the vicinity of the mold 2 and the mold 2 is heated in step S1, it has a high temperature and a high pressure. Under high temperature and high pressure, the mold wash dissolves in the mold 2 and forms a chemical bond between the mold rinses. Therefore, when the mixed powder 3 is pressed onto the surface 2 a of the mold 2, a mold forming layer 31 b having a chemical bond between the mold forming material and the mold 2 and between the mold forming materials is formed.

  Step S2 is performed until the thickness of the mold coating layer 31b becomes 200 micrometers or more and 200 micrometers or less. Moreover, when performing step S2, it is preferable that the contact pressure of the surface 2a of the metal mold | die 2 and the mixed powder 3 is hold | maintained at 1 Mpa or more.

  Note that step S1 and step S2 may be performed simultaneously, or step S2 may be performed before step S1.

  Next, a step (step S3) of removing the mixed powder 3 (unreacted mixed powder 3) that did not form the moldable layer 31b in step S2 is performed. In step S 3, the lid 52 is slid in the z-axis positive direction to reduce the pressure in the main body 51, and the lid 52 is removed from the main body 51. Then, the unreacted mixed powder 3 is removed from the main body 51. The moldable layer 31 b formed in step S 2 remains on the surface 2 a of the mold 2 in step S 3.

  Next, a step (step S4) of heating the mold-forming layer 31b formed in step S3 and firing the porous mold-forming layer is performed. In step S4, first, the lid 52 is fitted to the main body 51 from which the unreacted mixed powder 3 is removed, and the atmosphere in the main body 51 is sealed. In step S4, oxygen gas is used as an atmosphere in the main body 51. Oxygen gas is injected into the main body 51 using, for example, a pump (not shown).

  FIG. 3 is a cross-sectional view of a mold forming layer forming apparatus. When performing step S3, as shown in FIG. 3, the heater 4 is heated and the mold 2 is heated to approximately 700.degree. The heat of the heated mold 2 is transferred to the mold layer 31b, and the mold layer 31b is heated. In step S4, since oxygen gas is used as the atmosphere gas, carbon contained in the moldable layer 31b is burned off when heated and forms a large number of holes. Therefore, when the mold coating layer 31 b is heated, the porous mold coating layer 31 c is fired. The porous mold coating layer 31c is a structure having a large number of holes, and therefore, is superior in heat retention and air permeability to the mold coating layer 31b before firing.

  As described above, in the method for forming a moldable layer according to the present embodiment, the mixed powder 3 placed on the surface 2 a of the heated mold 2 is pressed to the surface 2 a of the mold 2. A pressing step (step S2) to press is performed. In step S2, the mold forming material forms a solid solution in the mold 2 and forms a chemical bond between the mold forming materials, so that a chemical bond is formed between the mold forming material and the mold 2 and between the mold forming materials. The mold-coating layer 31b which has is formed. The moldable layer 31 b is stronger than the moldable layer formed using a spray gun or the like. Therefore, it is possible to suppress the wear of the mold layer when the mold 2 is used repeatedly.

  The invention according to the present embodiment described above can provide a method for forming a mold coating layer that can suppress wear of the mold coating layer when the mold is repeatedly used.

  The present invention is not limited to the above embodiment, and can be appropriately modified without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Forming device of a coating layer 2 Mold 2a surface 3 Mixed powder 31b Coating layer 31c Porous coating layer 4 Heater 5 Pressure vessel 51 Body part 52 Cover part

Claims (1)

Pressing the mixed powder placed on the surface of the heated mold and pressing the mixed powder on the surface of the mold;
The mixed powder contains a mold material and carbon,
In the pressing step, the mold-coating material is reacted to form a mold-forming layer on the surface of the mold.
Method of forming a paint layer.

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