JPS5922907Y2 - Structure of suction pipe for vacuum molding - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a suction pipe that is attached to a flask used in vacuum molding and is used to uniformly vacuum the flask.

Vacuum molding generally involves forming a hollow part 1a as shown in Figure 1.
A suction port 1b is formed protruding from the outer circumferential surface, and sand 2 is filled in a casting flask with a large number of suction holes protruding from the inner circumferential surface. Films 3 and 4 made of synthetic resin are stretched on the upper and lower surfaces of the suction port 1, respectively.
From b, the hollow part 1a of the flask 1 and the small suction holes 1c, 1c.
By suctioning the air in sand 2 through...
is solidified and molded, and a model (
A casting space 5 is formed as a recessed portion of the part (not shown) extracted.

In this case, there is no problem when the flask is small, but when the flask is large and the volume of sand is large, the small suction holes 1c, 1c...
If only the suction is performed from the outside, the suction effect will be insufficient and the hardening of the sand will be incomplete. Therefore, as shown in Fig. 2, a suction vibro with many pores around the periphery is used as an auxiliary suction port in the casting flask 1. It is also common practice to communicate with the hollow portion 1a so that a more uniform suction effect can be exerted on the sand 2 in the flask 1.

As shown in FIG. 3, the conventionally used suction pipe has rod-shaped wire rods 8, 8... and ring materials 9, 9...
- are assembled into a block to constitute the support 7, and the outer periphery of this support 7 is wrapped with a fine reticular membrane 10, and although not shown, the support 7 is constructed of square timber, or there are many surrounding parts. They were made of a tubular material with small holes.

However, when molding work is carried out using the suction pipe mentioned above, the sprue for injecting molten metal into the mold, the lift for removing gas from the mold, and the removal of the mold body from the flask are There was a drawback that the reticular membrane was often damaged by contact with the suction pipe.

In other words, if molding is carried out without noticing this damage, a large cavity will be created in the sand around the damage, and the suction effect will be reduced, making the mold unusable. Not only does the work efficiency drop significantly as the vacuum pump must be repaired and molded again, but it also reduces the efficiency of the vacuum pump and shortens its lifespan.

In view of the above-mentioned drawbacks, the present invention was devised to provide a device in which the reticular membrane is not easily damaged. A suction pipe for vacuum forming is characterized in that the outer periphery of the reticular membrane is covered with reinforcing bars formed by combining bar-shaped vertical bars and ring-shaped horizontal bars in a block.

This will be explained in detail based on the embodiment shown in FIG. 4 and FIG.・It is composed of a combination of blocks.

In addition, this vertical stripe 12.12... and horizontal stripe 13.13.
... is used in Figure 3 with a cross-section, and in Figure 4 with a rectangular cross-section, but when using a rectangular cross-section, the long side should be radial. It is preferable to do so in terms of strength and prevention of damage to the reticular membrane 10.

Then, the reinforcing bar 11 is made of straight wire rods 8, 8, . . . and ring materials 9, 9, .
A suction vibro according to the present invention is constructed by covering the outer periphery of a supporting body 7 constructed by assembling .

By reinforcing the suction pipe with the reinforcing bars 11 in this way, the suction pipe as a whole has appropriate strength, and direct contact between the mesh membrane 10 and the sprue, the nozzle, and the casting body is prevented as much as possible to prevent this damage. It is.

Note that although the illustrated embodiment shows scales having a circular cross section, the scales are not limited to a circular cross section, and of course can be used for scales of all shapes.

Since the present invention has the above-mentioned structure, the suction pipe can be reinforced with reinforcing bars to provide sufficient strength, and the degree of direct contact between the mesh membrane, the sprue, the nozzle, and the casting body can be reduced. This damage can be prevented by reducing the amount of damage.

Therefore, the mold can be formed stably, which not only improves work efficiency, but also prevents sand from being sucked into the vacuum pump, thereby preventing a decrease in efficiency and a shortened lifespan. It has the effect of being able to

[Brief explanation of drawings]

Figure 1 is a cross-sectional view showing the working state of vacuum molding, Figure 2 is a cross-sectional view also using a suction pipe, Figure 3 is a partially cutaway perspective view showing a conventional suction pipe, and Figure 4 is the present invention. FIG. 5 is a partially cutaway perspective view showing one embodiment of the present invention, and FIG. 5 is a perspective view showing reinforcing bars of another embodiment of the present invention. 6... Suction pipe, 10... Reticular membrane, 11... Reinforcement bar, 12... Vertical bar, 13... Horizontal bar.

Claims (1)

[Scope of utility model registration request] A suction pipe for vacuum molding whose surface is covered with a fine reticular membrane, characterized in that the outer periphery of the reticular membrane is covered with reinforcing bars composed of a block-like combination of rod-shaped longitudinal striations and ring-shaped horizontal striations. Suction pipe for vacuum molding.