JP2009039754A - Die molding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten molding time in a molding machine where a molten metal injected into a molten metal injection chamber of a fixed die is pressurized and molded at a cavity between a fixed die and a movable die. <P>SOLUTION: The molding is formed through: a first stage where, after a movable die is opened to a fixed die, in such a manner that, to the parting face of the fixed die, the parting face of the movable die is retreated to a horizontal direction orthogonal to the die opening/closing direction, the movable die is horizontally moved from the opening state into a retreated state; a second stage B where, in the retreated state of the movable die, a molten metal is injected into a molten metal injection chamber of the fixed die, simultaneously, the fixed die is coated with a release agent, and further, after the discharge of a molding from the movable die, the movable die is coated with a release agent; and a third stage C where, after the movable die is horizontally moved from the retreated state into an opening state, in a state where the fixed die is closed, the molten metal injected into the molten metal injection chamber of the fixed die is pressurized and molded at the cavity between the fixed die and the movable die. According to this method, since, in the retreated state of the movable die, simultaneously with the injection of the molten metal to the fixed die, the discharge of the molding from the movable die and the application of the release agents to the fixed die and the movable die can be performed as well, molding time TS can be shortened. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a mold forming method in a vertical molding machine, for example.

  In a conventional vertical molding machine, as shown in FIG. 7, in a state where the movable mold is opened with respect to the fixed mold, the molded product is first taken out from the movable mold, and then a release agent is applied to the fixed mold and the movable mold. Apply and lubricate, then pour molten metal into the fixed pouring chamber. Further, in a state where the movable mold is clamped with respect to the fixed mold, the molten metal poured into the pouring chamber of the fixed mold is pressed by a cavity between the fixed mold and the movable mold and molded.

However, since the molten metal is injected after the molded product is taken out and the lubricating oil is applied, there is a problem that the molding time TL becomes long.
An object of the present invention is to reduce the molding time in a molding machine that presses and forms a molten metal poured into a fixed mold pouring chamber in a cavity between a fixed mold and a movable mold.

The present invention will be described with reference to the reference numerals of the drawings (FIGS. 1 to 6) of the embodiments described later.
The mold forming method according to the invention of claim 1 manufactures a molded product 21 through the following steps.
First step A: After opening the movable mold 4 with respect to the fixed mold 3, the parting surface of the movable mold 4 is retracted in the lateral direction perpendicular to the mold opening / closing direction with respect to the parting surface of the fixed mold 3. The movable mold 4 is moved laterally from the mold open state P to the retracted state Q.

  Second step B: In the retracted state Q of the movable mold 4, the molten metal 22 is injected into the pouring chamber 13 of the fixed mold 3, and at the same time, a release agent is applied to the fixed mold 3 and the molded article 21 is moved from the movable mold 4. After the mold is taken out, a release agent is applied to the movable mold 4.

  Third step C: The molten metal poured into the pouring chamber 13 of the fixed mold 3 in the state R in which the movable mold 4 is moved from the retracted state Q to the fixed mold 3 through the mold opening state P. 22 is pressed by a cavity 23 between the fixed mold 3 and the movable mold 4 to be molded.

In the second invention based on the first invention, the molten metal 22 is poured into the pouring chamber 13 of the fixed mold 3 also during the first step.
In the invention of claim 3 premised on the invention of claim 1 or claim 2, a mold release agent is applied to the fixed mold 3 also during the first step.

  According to the present invention, the movable mold 4 can be not only in the mold open state P but also in the retracted state Q. In the retracted state Q of the movable mold 4, the movable mold 4 is simultaneously injected with the molten metal 22 into the fixed mold 3. Since the molded product 21 can be taken out from the container and the release agent can be applied to the fixed mold 3 and the movable mold 4, the molding time TS can be shortened.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
In the vertical molding machine schematically shown in FIGS. 1 to 4, a fixed mold 3 is installed at the lower part of the machine frame 2 of the apparatus main body 1, and a movable table (not shown) supported on the upper part of the machine frame 2. A movable mold 4 and a molded product pushing mechanism 5 shown in FIG. The movable table (not shown) is moved up and down above the fixed mold 3 by the movable opening / closing mechanism 6 shown in FIG. 5 to take the lowered position and the raised position, and lifted by the movable lateral movement mechanism 7 shown in FIG. Moves horizontally between the position (non-retracted position) and the retracted position. In the fixed mold 3, a pressurizing table 10 that can move up and down along guide bars 9 erected on both sides of the base 8 is biased upward by the elastic force of the spring 11. A pouring chamber 13 is formed in the pressurizing table 10 below the mold surface 12 formed in the upper central portion, and a pressurizing rod 14 erected in the central portion of the base 8 is provided in the pouring chamber 13. Has been inserted. In the movable mold 4, guide holes 15 are formed on both sides, and a mold surface 16 is formed in the lower center portion. A fixed mold release agent coating mechanism 17, a movable mold release agent coating mechanism 18, a molten metal injection mechanism 19 and the like shown in FIG.

  The controller 20 shown in FIG. 5 drives the drive part 5a of the molded product pushing mechanism 5, the drive part 6a of the movable opening / closing mechanism 6, the drive part 7a of the movable lateral movement mechanism 7, and the fixed mold release agent coating mechanism 17. The drive part 18a of the part 17a, the movable mold release agent application mechanism 18 and the drive part 19a of the molten metal injection mechanism 19 are controlled according to the timing chart shown in FIG.

  In FIG. 1, after the molding operation, the movable base (not shown) is moved from the lowered position to the raised position (non-retracted position) by the drive unit 6 a of the movable mold opening / closing mechanism 6, and the movable mold 4 is in the mold open state P. The molded product 21 is held on the mold surface 16 of the movable mold 4. In this mold open state P, the parting surface of the movable mold 4 opposes the parting surface of the fixed mold 3 in the upper region. On the other hand, in the fixed mold 3, the guide bar 9 is removed from the guide hole 15 as the movable mold 4 is raised, and the pressurizing table 10 is moved upward by the elastic force of the spring 11.

Immediately after the mold opening of the movable mold 4 is started, injection of the molten metal 22 (see FIG. 2) into the molten metal injection chamber 13 of the fixed mold 3 is started by the drive unit 19 a of the molten metal injection mechanism 19.
Immediately after the mold opening of the movable mold 4, as shown in FIG. 2, the movable base (not shown) is moved from the raised position (non-retracted position) to the retracted position by the drive unit 7a of the movable lateral movement mechanism 7. Thus, the movable mold 4 changes from the mold open state P to the retracted state Q. In this retracted state Q, the movable mold 4 is retracted from the mold open state P in the lateral direction perpendicular to the mold opening / closing direction, and the parting surface of the movable mold 4 is disengaged from the region above the parting surface of the fixed mold 3. Prior to the end of the lateral movement of the movable mold 4, application of the release agent to the mold surface 12 of the fixed mold 3 is started by the drive unit 17 a of the fixed mold release agent application mechanism 17.

  Immediately after the end of the lateral movement of the movable mold 4, the molded product 21 held on the mold surface 16 of the movable mold 4 is pushed out and taken out by the drive unit 5 a of the molded product pushing mechanism 5. Application of the release agent to the mold surface 12 of the fixed mold 3 is completed before the removal of the molded product 21 is completed. Immediately after the removal of the molded product 21 is finished, application of the release agent to the mold surface 16 of the movable mold 4 is started by the drive unit 18a of the movable mold release agent application mechanism 18. Note that a lubricating oil may be applied to the mold surface 12 of the fixed mold 3 and the mold surface 16 of the movable mold 4 after the release agent is applied.

Even during the removal of the molded product 21 and the application of the release agent, the molten metal 22 (see FIG. 2) is continuously injected into the pouring chamber 13 of the fixed mold 3.
Immediately after the pouring of the molten metal 22 (see FIG. 2) into the pouring chamber 13 of the fixed mold 3, the movable table (not shown) is retracted by the drive unit 7 a of the movable lateral movement mechanism 7 as shown in FIG. 3. The movable mold 4 returns from the retracted state Q to the mold open state P from the position to the raised position (non-retracted position).

  Next, as shown in FIG. 4, the movable base 4 (not shown) is moved from the raised position (non-retracted position) to the lowered position by the driving unit 6a of the movable mold opening / closing mechanism 6, and the movable mold 4 is in the mold open state. The mold clamping state R starts from P. When moving from the mold opening state P to the mold clamping state R, as the movable mold 4 is lowered, the guide rod 9 of the fixed mold 3 is inserted into the guide hole 15 and the pressure table 10 of the fixed mold 3 is movable. 4 is pushed down against the elastic force of the spring 11, and the molten metal 22 in the pouring chamber 13 is added to the cavity 23 between the mold surface 12 of the fixed mold 3 and the mold surface 16 of the movable mold 4. The pressure rod 14 is pressurized and supplied. Thereafter, the molten metal 22 is cured in the cavity 23, and the movable mold 4 is in the mold open state P as described above, and the molded product 21 is held on the mold surface 16 of the movable mold 4.

This embodiment has the following effects.
* Since the movable mold 4 can be set not only in the mold open state P but also in the retracted state Q, in the retracted state Q, the upper area U (see FIG. 2) of the fixed mold 3 and the lower area D of the movable mold 4 (FIG. 2) can be opened. Accordingly, the fixed mold release agent coating mechanism 17 and the molten metal injection mechanism 19 are disposed in the upper area U (see FIG. 2) of the fixed mold 3, and the movable area 4 is movable in the lower area D (see FIG. 2). A mold release agent application mechanism 18 can be provided.

  * In this retracted state Q of the movable mold 4, simultaneously with the injection of the molten metal 22 into the fixed mold 3, the molded product 21 can be taken out from the movable mold 4 and a release agent can be applied to the fixed mold 3 and the movable mold 4. it can. Accordingly, the molding time TS shown in FIG. 6 is shorter than the molding time TL shown in FIGS. 6 and 7 by the shortened time TC (− = TL−TS), and the molding time TS can be eliminated.

It is sectional drawing which shows schematically the mold opening state of the vertical molding machine concerning this embodiment. It is sectional drawing which shows roughly the retracted state of a movable mold | type in the said vertical molding machine. It is sectional drawing which shows a mold opening state roughly in the said vertical molding machine. It is sectional drawing which shows roughly a clamping state in the said vertical molding machine. It is a schematic electric block circuit diagram in the said vertical molding machine. It is a time chart in the said vertical molding machine. It is a time chart in the conventional molding machine.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 3 ... Fixed mold, 4 ... Movable mold, 13 ... Pouring chamber, 21 ... Molded article, 22 ... Molten metal, 23 ... Cavity, P ... Mold open state, Q ... Retracted state, R ... Clamped state, A ... First Step, B ... Second step, C ... Third step.

Claims (3)

After the movable mold is opened relative to the fixed mold, the movable mold is moved laterally from the mold open state so that the movable parting surface is retracted in a lateral direction perpendicular to the mold opening / closing direction with respect to the fixed mold parting surface. The first step to the retracted state,
With the movable mold retracted, the molten metal is poured into the fixed mold pouring chamber, and at the same time, the mold release agent is applied to the fixed mold, and the mold release agent is applied to the movable mold after taking out the molded product from the movable mold. The second step;
In a state where the movable mold is moved laterally from the retracted state and the fixed mold is clamped with respect to the fixed mold, the molten metal injected into the pouring chamber of the fixed mold is placed in a cavity between the fixed mold and the movable mold. A mold forming method, wherein the molded product is manufactured through a third step of forming by pressing. The mold forming method according to claim 1, wherein the molten metal is poured into the stationary mold pouring chamber even during the first step. The mold forming method according to claim 1 or 2, wherein a mold release agent is applied to the fixed mold also during the first step.

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