JPH0216830Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a core forming machine, and more specifically, the present invention relates to a core forming machine, and more specifically, the supply of core forming sand to the cavity of a mold is arranged at the bottom of the mold. This invention relates to a core forming machine using a blow-type sand feeder.

(Prior art) In this type of core molding machine, sand for core molding is filled into the already heated cavity of the mold using the blow-type sand feeder, and the heat of the mold is used. The core is formed by melting the resin in the sand and firing it directly.
In forming this core, for cost reasons, the core is not formed using all the sand in the cavity, but by adjusting the upper track heating time, a predetermined thickness is obtained from the inner surface of the mold. A core is formed using just enough sand, that is, a hollow core is formed, and the sand in the center is collected. However, in conventional core forming machines, one end is opened on the top surface of the box-shaped blow body, and the sand inside the blow body is fed into the downward sand supply passage of the mold through a blow pipe that hangs down inside the blow body. However, even if the blowing is stopped, the sand in the blow pipe of the sand feeder will remain, so when the sand feeder is removed from the mold, the sand in the center of the core will pass through the blow pipe. There was a problem that the sand could not be returned to the inside of the sand supply machine and would scatter.

(Purpose of the invention) Therefore, an object of the present invention is to provide a core forming machine that can reliably collect the sand at the center of the core.

(Structure of the invention) The core forming machine according to the invention has a pair of halves, which are arranged so as to be able to be approached and separated in the horizontal direction, and in which a cavity for forming the core and a sand supply passage extending from the cavity to the lower surface are formed in the mating part. In a core forming machine for forming a hollow core, the sand supply means is equipped with a mold consisting of The upper part has an opening that communicates with the sand supply passage when connected to the mold, and the side part has a sand supply port and an air supply port. a box-shaped blow body provided with a supply port; a first drive means for moving the blow body up and down; a blowing pipe having a connection part to the blowing pipe and having an opening at the lower end that serves both for supplying and discharging sand; and a blowing pipe arranged inside the blowing body and movable up and down with respect to the lower end of the blowing pipe. a sand receiving member,
For the lower end of the blow pipe inside the blow body,
The present invention is characterized by having a second driving means for vertically moving the sand receiving member to control the stored sand on the sand receiving member between a buried state and a separated state.

(Embodiments) Hereinafter, a core forming machine according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

The drawing is a longitudinal sectional view of a core forming machine 1 according to an embodiment of the present invention.

The core forming machine 1 consists of a mold and a sand feeder 3. Mold 2 is vertically divided,
That is, it consists of a pair of half parts 4a and 4b that are arranged so as to be able to move toward and away from each other in the horizontal direction. One of these pair of halves 4a, 4b is of a fixed type, supported by a fixed support 5, and the other is of a movable type, supported by a horizontally movable movable support 6. The mold 2 includes a core-forming cavity 7 at the joint of the pair of half parts 4a and 4b, and this cavity 7.
A sand supply passage 8 is formed extending from the bottom surface 2a to the bottom surface 2a. The lower part 8a of the sand supply passage 8 is enlarged in diameter into a truncated cone shape as shown in the figure for the purpose of explanation later.

The sand supply machine 3 is for supplying core-forming sand S into the cavity 7 of the mold 2 from below by blowing, and includes a drum-shaped blow main body 1.
It is equipped with 0. The blow main body 10 has a protruding part 11 formed at the center of its upper end, and the upper part 11a of the protruding part 11 has a conical shape that can be fitted into the lower part 8a of the sand supply passage 8. It is trapezoidal. This protrusion 11 is formed with an opening 12 that communicates with the cavity 7 of the mold 3 when the sand feeder 3 is connected to the mold 2 as shown in the figure. In this way, the sand feeder 3 can take either the upper position connected to the mold 2 or the lower position away from the mold 2, and the sand feeder 3 can be placed in either of the above two positions. A cylinder device 13 is provided for movement between the two. Note that a heat-resistant sealing material 14 is applied to the contact surface of the protrusion 11 with the mold 3 in order to prevent heat from the mold 2 from being transmitted to the sand feeder 3.

Inside the blow main body 10, the opening 1 is provided.
A blow pipe 15 extending downward from 2 is provided. The lower end of this blow pipe 15 extends slightly below the middle of the blow main body 10, and a bottom receiving box 16 is located at the lower end position.
is located. This bottom receiving box 16 is
It accommodates sand S for core modeling. An air supply port 17 and a sand supply port 18 are provided on the side of the blow body 10 above the bottom receiving box 16. The air supply port 17 blows air into the blow body 10, blows up the sand S in the box 16, and fills the sand S into the cavity 7 of the mold 2 through the blow pipe 15 and the opening 12. belongs to. On the other hand, the sand supply port 18 is for supplying sand S from the outside of the blow main body 10 to the box 16, and has a door-like member 19 that opens inwardly but not outwardly.
is provided. Due to the structure described above, this door-like member 19 prevents air and sand from being blown out from inside the blow body 10 when air is blown into the blow body 10 from the air supply port 17. There is.

After filling the cavity 7 of the mold 2 with sand S, the mold 2 is heated to form the core C. In order to effectively utilize the sand S, the mold 2 is By adjusting the heating time, only the resin of the sand having a predetermined thickness T is melted, and the core C is formed using only this portion. Therefore, the sand in the center of the cavity 7 remains in its original state and can be reused as is. However, at the stage when the molding of the core C is completed, the blow pipe 15 and the opening 12 are still filled with sand, so even if the blow body 10 is simply lowered by the cylinder device 13, the mold 3 The sand S in the center of the cavity 7 only spills outside.

Therefore, in the present invention, the bottom receiving box 16 is slidably arranged inside the blow main body 10. This box 16 can assume either an upper position, shown in solid lines, or a lower position, shown in chain lines, and movement between these two positions is effected by a cylinder device 20. The sand supply device 3 is configured to take in air from the air supply port 17 when the bottom receiving box 16 is in the above-mentioned upper position, and supply sand S to the cavity 7 of the mold 2 by the action of this air. It's summery. After filling the cavity 7 with the sand S, the core C is shaped, and then the bottom receiving box 16 is lowered to the above-mentioned lower position by the action of the cylinder device 20. When the bottom support box 16 is lowered in this way, the blow pipe 15
The sand inside falls into the bottom receiving box 16 and the blowing pipe 15 becomes empty, so the sand in the center of the cavity 7 also falls through this blowing pipe 15 and is collected into the bottom receiving box 16. be done. If the sand in the center of the cavity 7 is difficult to fall, the mold 2 may be vibrated. This vibration of the mold 2 is also effective in peeling off the molded core C from the mold 2. As described above, the mold 2 and the sand supply device 3 are connected by fitting the conical concave and convex portions, so the vibration of the mold 2 is transmitted to the sand supply device 3, especially the blowing pipe Since the sand is transmitted to the blow pipe 15, the sand in the blow pipe 15 can be efficiently dropped.

(Effects of the invention) In the core forming machine of the present invention, as described above, the bottom receiving box, that is, the sand receiving member containing the sand for forming the core, is movable up and down, and is lowered after forming the core. As a result, the blowing pipe can be emptied, making it possible to efficiently collect the sand in the center of the cavity before separating the mold and sand feeder. This series of modeling operations can be performed stably over a long period of time.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional view of a core forming machine according to an embodiment of the present invention. 2... Mold, 3... Sand feeder, 4a... Fixed type, 4b... Movable type, 7... Cavity, 8...
Sand supply passage, 10... Blow body, 12... Opening, 15... Blow pipe, 16... Bottom receiving box, 17... Air supply port, 18... Sand supply port, 13, 20... Cylinder Device.

Claims (1)

[Scope of utility model registration request] A mold consisting of a pair of halves that are arranged so as to be horizontally removable and have a cavity for molding the core in the mating part and a sand supply passage extending from this cavity to the lower surface, and a mold in which the core is formed in the cavity of the mold. In a core shaping machine that is equipped with a supply means for supplying sand for modeling and that shapes a hollow core, the sand supply means is movable up and down below the mold so that it can be connected to the lower part of the mold. a box-shaped blow body, which has an opening in the upper part that communicates with the sand supply passage when connected to the mold, and has a sand supply port and an air supply port in the side parts; a first drive means for moving up and down the blow body, a first drive means fixedly installed inside the blow body, extending downward from the opening of the blow body, having a connection part to the mold at the upper end, and a first drive means for supplying and discharging sand at the lower end. a sand receiving member disposed inside the blow main body and movable up and down with respect to the lower end of the blow pipe; A core forming machine characterized by having a second drive means for moving the sand receiving member up and down in order to control the stored sand on the sand receiving member into a buried state and a separated state with respect to the lower end portion.