JPH066224B2 - Peeping nozzle for heating mold - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a peep nozzle for a heating die, and more particularly to a heating die having a shield plate for forming an angle of repose at the nozzle tip and a cooling cavity in the outer peripheral wall of the nozzle. A peep nozzle for molds.

2. Description of the Related Art As a peep nozzle for molding sand injection, a nozzle made of a flexible material is used, and its end face is variously devised.
Nos. 51-8008, 57-29956, 29957 and the like are disclosed in Japanese Patent No. 52-50185, which has a mechanically actuated valve mechanism at the molding sand jet. Kosho 53-2
No. 0250, Japanese Patent Publication No. 57-3452, and Japanese Utility Model Publication No. 57-42587, and a water-cooled sand blowing nozzle having a current plate in the water jacket is disclosed in Japanese Utility Model Publication No. 64-38132. There is.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention It is known that these conventional techniques have the following defects: (1) Replacing a shielding plate for forming an angle of repose of molding sand or a part corresponding thereto, and a worn part Cannot be done, and replacement work is complicated.

(2) In the case of a valve mechanism that opens and closes mechanically, it is not possible to completely prevent the molding sand from falling by its own weight due to wear of the closing part and incomplete operation. With the shield plate mechanism, the sand resting at the angle of repose was shaken off by a slight shock, and the sand filling directly below the shield plate was insufficient.

(3) Although a structure in which the peep nozzle body is cooled is known, the circulation of the refrigerant to the nozzle tip is insufficient.

Means for Solving the Problems The inventors of the present invention succeeded in developing the peep nozzle of the present invention as a result of various studies and experiments to solve the above-mentioned various defects of the conventional method, and the technical constitution of the invention is As described in the claims, the detailed description will be given with reference to the accompanying drawings showing specific examples of the present invention.

FIG. 1 shows an example of the peep nozzle of the present invention to which a water cooling system is applied. The nozzle attached to the blow plate (9) is inserted into the blow opening of the mold (10), and the mold cavity (mold forming part) FIG. 4 is a vertical cross-sectional view showing a state in which molding sand (11) is blown into the).

As shown, the nozzle includes a nozzle body (1) and a nozzle body.
It consists of a nozzle tip (2) that is removable from (1). A large number of refrigerant passages (b) are bored in the nozzle body (1) in parallel with the axis of the nozzle body (1), and a ring-shaped cooling passage (b ') communicating with the refrigerant passage is provided in the nozzle body (1). (5) is an outer cylinder provided near the tip of (1) and closing the ring-shaped cooling passage (b '). The refrigerant passage (b) has a refrigerant supply port (a) and a refrigerant discharge port.
(c) communicates with each other, and its upper end is closed by a plug (6).

The tip of the nozzle (2) is coaxial with the center of the end face.
(h), and a connecting portion (which may be a screw type) to the nozzle body is provided at the other end. (3) is a shielding plate,
It is provided coaxially with the nozzle tip (2) and with a sand passage gap provided between the tip and the inner peripheral surface of the tip. The shielding plate (3)
Has a plurality of locking protrusions (3 ') protruding from the outer periphery thereof, and these protrusions (3') are clamped or fixed between the nozzle body (1) and the nozzle tip (2), or Lock in place by other suitable means.

The peripheral edge of the shield plate (3) has a cross-sectional shape (downward dish shape) slightly inclined downward as shown, and the outer diameter of the dish-shaped bottom edge is slightly larger than the inner diameter of the circumference of the sand blowout port (h). To do. With such a relative relationship, the load of the molding sand (11) above the blow plate and inside the peep nozzle is received, and the angle of repose (r) is generated in the molding sand (11) inside the nozzle tip (2). ,
It is designed to prevent the natural fall of sand. With such a structure, the shield plate (3) and the nozzle tip (2), which are worn parts, can be easily replaced.

With the above mechanism, an unnecessary sand hardening part (called blow candle) is not formed together with the created mold, the hardening phenomenon of sand making in the blow nozzle does not occur, and a smooth molding cycle is achieved. You can continue.

FIG. 2 is a sectional view of the peep nozzle of the present invention which uses compressed air as a refrigerant, and the same reference numerals as those in FIG. 1 denote the same members.

In this specific example using compressed air as the refrigerant, the nozzle body (1)
A large number of air jets (e) are formed in the cooling passage (b ') of the above, and this air jet (e) is the first
The configuration is similar to that shown in the figure.

With this peep nozzle, compressed air is not ejected while the molding sand is being blown, and as shown in the figure, the compressed air is ejected after the nozzle withdraws from the mold (10) to cool the nozzle (10). Is. At this time, since the air ejection port (e) is narrowed, the cooling effect is further enhanced by the volume expansion of the compressed air, and the cooled ejection air hits each other of the peep nozzles implanted in the blow plate to The forced cooling from is performed.

FIG. 3 is almost the same as the mechanism of FIG. 2, except that the communication portion (d ') between the compressed air supply port (d) and the refrigerant passage (b) has a narrow structure in an orifice shape, and the air ejection port ( It is sectional drawing which shows the example of the structure which made the cross section of e) larger than this communicating part (d ').

With such a structure, the compressed air introduced from the air supply port (d) is rapidly expanded when passing through the orifice (d ′), thereby enhancing the cooling effect inside the nozzle body. The air discharged from the jet port (e) is used to forcibly cool a large number of adjacent peep nozzle groups as in the example shown in FIG.

FIG. 4 is a cross-sectional view showing an example of the peep nozzle of the present invention using a liquid refrigerant (normal water), which is an example in which the nozzle body (7) and the inner cylinder (8) are integrated by welding or the like.

The refrigerant passage (b) is provided as a cylindrical space on the outer circumference of the inner cylinder (8), and inside the refrigerant passage, as shown in FIG.
0) is provided radially in relation to the nozzle body axis, and a cooling passage is provided to enhance the cooling effect.

FIG. 5 is a sectional view showing an example having the same configuration as the peep nozzle of FIG. 4, but having a configuration in which the cooling medium is compressed air and cooling can be continued even while the molding sand is being blown.

(f) is an air supply port, and an orifice is provided between it and the refrigerant passage (b).
(f ') is provided and the exhaust port (g) has a large diameter.

With such a configuration, compressed air can be supplied even when the peep nozzle is blowing sand (state shown in the figure), and by providing the orifice (f '), the volume expansion at the time of ejection into the refrigerant passage The cooling effect can be enhanced and the cooling effect can be enhanced by constantly supplying the refrigerant.

EFFECTS OF THE INVENTION (1) Since the nozzle body and the nozzle tip portion are configured to be removable, it is easy to replace the shield plate for the worn portion, the nozzle tip portion, and the like.

(2) Since the angle of repose is formed after the sand load above the shield plate is received by the shield plate, there is no drop of sand due to shock.

(3) Since the sand blown from the outer peripheral portion of the shielding plate is converted to the central portion by the inner peripheral edge of the nozzle tip, the sand filling right under the shielding plate is good.

(4) It is possible to prevent the sand from falling by its own weight without using a mechanical opening / closing valve mechanism.

(5) Since the circulation of the refrigerant at the most heated portion of the peep nozzle is improved, the cooling effect is high and the sand in the nozzle is not hardened due to the influence.

(6) Since the blow mold is not formed in the molding mold, the removing step is unnecessary.

(7) When compressed air is used as a refrigerant, there is no problem of rust generation as in the case of using a liquid refrigerant such as water. Further, in the case of the gas refrigerant, even if there is some leakage at the connection portion, there is no adverse effect on the mechanism and the molding work.

[Brief description of drawings]

1 to 5 are longitudinal sectional views showing various examples of the peep nozzle of the present invention, and FIG. 6 is a perspective view showing a mode of a partition plate provided in the refrigerant passage. In the drawings: 1, 7 ... Nozzle Main body, 2 ... Nozzle tip, 3 ... Shielding plate,
3 '... locking projections, 4 ... packing, 5 ... outer cylinder, 6 ... plug, 8 ... inner cylinder, 9 ... blow plate, 10 ... mold, 11 ...
Molding sand, 12 ... Molding mold, 13 ... Mold injection hole, 20 ... Partition plate,
a ... Refrigerant supply port, b ... Refrigerant passage, b '... Ring cooling passage, c ... Refrigerant discharge port, d ... Supply port, d' ... Orifice,
e ... Air jet, f ... Air inlet, f '... Orifice, g
… Exhaust port, h… Sand blow port, r… Angle of repose,

Claims (5)

[Claims] 1. A nozzle body (1) and a nozzle tip portion (2) which is attachable to and detachable from the nozzle body (1). The nozzle body (1) includes a refrigerant passage and a refrigerant supply port and a discharge port. And a nozzle tip connecting portion at one end, and the nozzle tip (2)
Has a sand blowout port (h) at the center of the end face, has a connecting part to the nozzle body at the other end, and has a shield plate (3) coaxial with the nozzle tip (2) around the inner circumference of the tip. A heating die peeping nozzle, characterized in that a sand passage gap is provided between the surface and the inner surface. 2. The peep nozzle for a heating mold according to claim 1, wherein the refrigerant passage is composed of a large number of holes provided in parallel with the axis of the nozzle body, and a ring-shaped cooling passage is provided near the tip of the nozzle body. 3. The peep nozzle for a heating mold according to claim 1, wherein the refrigerant discharge port is a plurality of air jet holes formed at the tip of the nozzle body. 4. The peep nozzle for a heating die according to claim 1, wherein the refrigerant is liquid or gas. 5. The peep nozzle for a heating die according to claim 1, wherein the cross-sectional area of the communication portion between the refrigerant supply port and the refrigerant passage or the air ejection port is smaller than the cross-sectional area of the refrigerant supply port.