JPH02258143A - Apparatus for making mold - Google Patents

Abstract

PURPOSE:To easily and surely made a mold of complicated shape by arranging a rectangular frame body to a blow plate in a blow head as freely ascending/ descending and also fixing a pressing plate boring gas vent holes at outside of the blow head. CONSTITUTION:A cylinder 12 for raising flask is descended and a squeeze cylinder 8 is ascended to pressing-contact the raising flask 10 with a casting flask 11. By shrinking a cylinder 16 for blow head, the blow head 1 is descended, and molding sand together with compressed air from a compressed air supplying hole 3 are blown into the raising flask 10 and casting flask 11 from the blow plate 6. The molding sand is moved through gap between the rectangular frame body 17, and packed into every corners in the raising flask and casting flask, and the compressed air is caused to flow through the casting flask, raising flask and gas vent holes 14 in the pressing plate 13 in order and discharged to the outside air. At the time of ascending a pattern surface plate 9 by ascending the blow plate 6 in the blow head 1 to the pressing plate face 13, the molding sand near the raising flask and casting flask is packed at high density. By this method, packing of the molding sand even in the complicated shape, can be uniformly executed over the whole casting flask.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an improvement in a mold making device, and more particularly, to a mold making device that can make mold hardness substantially uniform.

(Prior art) There is a conventional mold making device as shown in Fig. 4 (for example, "New version casting method" (March 3, 1988)).
Casting Technology Promotion Association, pp. 28-30). This one includes a fixed flow head 21, a model surface plate 22 connected to a squeeze cylinder 23 facing negative, and a cylinder 24 around the joint frame 24 facing downward connected to a joint frame 26.
The blow head 21 is equipped with blow plays 1 to 2.
5 is attached, and a joint frame 26 is attached to the model surface plate 22.
and a casting flask 27 are placed thereon.

(Problem to be solved by the invention) Lowered joint frame peripheral cylinder 24 and raised model surface plate 22
After crimping the joint frame 26 and the casting flask 27, when compressed air of 2 to 3 kg/mm is supplied to the blow head 21, the molding sand 28 is blown together with the compressed air from the blow plate 25, and the joint frame 26 and the casting flask are compressed. It is blown into 27. Next, the hydraulic pressure of the joint frame circumferential cylinder 24 is released, and the squeeze cylinder 23 is raised one more step to raise the blow head 21.
However, compressed air cannot be sufficiently removed from the injected molding sand 28 to make the sand density uniform, and mold deformation due to the conveyance process or the passage of time occurs. and firmness due to casting pressure. Therefore, the present invention has been made to solve this problem, and provides a mold making device that can quickly remove the compressed air from the foundry sand and easily make the entire foundry sand to the required hardness. be.

(Means for Solving the Problems) The present invention provides a mold in which a rectangular frame is provided on the flow plate of the flow head 1 which can be raised and lowered freely, and a press plate with J1'' holes is fixed on the outside of the flow head 5. It is a molding device.

(Function) When molding sand is blown into the joint frame and H frame, the sand moves through the gap between the rectangular frame and the model, filling every corner of the joint frame and casting flask, and the compressed air flows through the flask, joint frame, and plowing holes in the pressing plate in order and is discharged into the atmosphere. Next, blow play 1~ of the flow head to the pressing plate surface 1~
51 and the model surface plate is raised, the molding sand near the joint frame and casting flask is filled in a high density state.

(Example) An example of the present invention will be explained based on FIGS. 1 to 3.
FIGS. 1 and 2 show a mold making apparatus according to the present invention, and a part of a blow head 1 that can be raised and lowered has a sun tank for filling the inside with ifJ sand (not shown). +-2 is attached, and a compressed air supply port 3 and a compressed air discharge port 4 are provided for supplying and discharging compressed air to the flow head 1, and a flow hole 5 is provided in the lower part of the blow play 1. 6 and a rectangular frame 7 are provided.

A squeeze cylinder 8 that can be raised and lowered is provided in the Z direction of the flowhenos 1 to 1, and a model surface plate 9 is attached to the squeeze cylinder 8.
are connected, and a joint frame 10 and a casting flask 11 are placed on the model surface plate 9.

Four downward connecting cylinders 12 are installed around the sides of the flow eights 1~, and these cylinders 12 are connected to the four corners of the upper surface of the connecting frame 10, and the cylinders 12 are connected to the lowered cylinders 12. The joint frame 10 and the casting flask 11 are formed so as to be pressed together by the raised model surface plate 9. A pressure plate 13 made of a rectangular hollow frame is fixed on the outside of the blow head 1, and a large number of exhaust holes 14 are bored in the pressure plate 13. A pipe 15 is connected to the pipe 15, and four upper 1r+:l broad cylinders 16 are installed adjacent to the flow head 1, and the cylinders 16 are connected to the flow head 1 and the pressure plate 13. There is.

Next, the operation will be described.

As shown in FIG. 1, the joint frame square cylinder 2 is extended in the -1 direction, and the squeegee cylinder 8 is extended upward to press the joint frame 10 and the casting flask.

Next, the cylinder 16 for the flow 71' is contracted downward to lower the flow 71', and then compressed air is supplied into the blow head 1 from the compressed air supply port 4.
Molding sand (not shown) is sent to the blow plate 6 along with compressed air.
It is blown into the flask 10 and the flask 11 from above. The molding sand (not shown) is moved through the gap between the rectangular frame 7 and the model 17 to the model 17 by d-7, and is moved to the joint frame 10 and the casting flask 11.
The compressed air is filled to every corner of the flask 11° and the joint frame 10.
, flows through the exhaust hole 14 of the press plate 13 and the exhaust pipe 15 in order and is discharged. After that, the cylinders 16 for blowhens 1 to 16 are extended in one direction to move the flowhens 1-1 upward H1, and the probe retro is raised to the surface of the press plate 13, and the hydraulic pressure of the cylinder 12 for connecting plugs is released and the squeegee When the cylinder 8 is extended in three directions and molding sand (not shown) filled in the splicing frame 10 and the flask 11 is pressed by the model surface plate 9, the moldings near the splice [O] and the flask [11] are pressed. As the sand (not shown) is filled in a dense state, the entire foundry sand (not shown) becomes even more dense, so that the entire foundry sand (not shown) has the required hardness.

After the molding sand (not shown) hardens, the squeeze cylinder 8 is contracted downward to lower the model surface plate 9, and the plug cylinder 12 is moved 1. The joint frame 1 is contracted in the direction
When the mold 0 is cut out and the molded flask 11 is then taken out from the model surface plate 9, a mold as shown in FIG. 3 is obtained. After that, another empty casting flask 11 is placed on the model surface plate 9,
The flow chamber 1-1 is filled with molding sand (not shown) from the sand chambers 1 and 2.

(Effects of the Invention) According to the present invention, 51. When a rectangular frame is provided on the flow play 1 to the freely descendable flow spatula 1, a pressure plate with holes perforated is fixed on the outside of the flow spatula 1-, so it can be used even if the shape of the model is complicated. However, filling the molding sand evenly over the entire flask makes it easy to form a mold with the required hardness. , noise and vibration can be reduced, making molding work easier and faster.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway top view showing one embodiment of the present invention;
3 is a sectional view showing a mold that has been formed, and FIG. 4 is a partially cutaway front view of a conventional mold making apparatus showing a state in which molding sand is blown into the mold. ■...Flow Hera 1-16...Flow Play 1~.
7... Frame body, 13... Pressing plate, 14... Opening hole. Procedural amendment (method) 1. Indication of the case 1999 Patent Application No. 81762 2. Name of the invention Mold making device 3. Person making the amendment Relationship to the case Patent applicant address 473 Takaoka Shinmachi Tenno, Toyota City, Aichi Prefecture No. 1 4, Date of amendment order 1999 (Despatch date: June 12, 1999, July 4, 1999) 5. Amendment of procedure subject to amendment (voluntary) July 19, 1999 1. Indication of incident Heisei 1 Year Patent Application No. 81762 2, Name of the invention Mold making device 3, Relationship with the case of the person making the amendment Patent applicant address 1-1 Tenno, Takaoka Shinmachi, Toyota City, Aichi Prefecture 473 (Telephone: 0565-52-1133) 5. Column 6 of "Detailed Description of the Invention" of the specification to be amended, contents of the amendment (1) Delete "3. Detailed Description of the Invention" in line 10 of page 1 of the specification. (2) Add the following items between lines 10 and 11 on page 1. "3. Detailed Description of the Invention" 6. Contents of Amendment (1) "Compressed air supply port 4" on page 5, line 11 of the specification is corrected to "compressed air supply port 3." (2) "Upward extension action" on page 6, line 4 is corrected to "upward extension action."

Claims (1)

[Claims] In a mold making device that blows foundry sand from a blow head into a joint frame and a casting flask, a rectangular frame is provided on the blow plate of the blow head that can be raised and lowered, and an exhaust hole is bored on the outside of the blow head. A mold making device characterized by a fixed plate.