JP2597165Y2 - Plunger chip for die casting - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die casting machine, and more particularly to a plunger chip used for a horizontal injection type cold chamber die casting machine.

[0002]

2. Description of the Related Art Since a plunger chip of this kind is heated by directly touching a high-temperature molten metal at the time of injection, it is preferable to always cool the plunger chip properly so as not to expand as much as possible, and various methods have been proposed. .

[0003] Among them, in a plunger chip in which a cooling chamber is formed inside the chip body and the cooling water is circulated and supplied into the cooling chamber, the cooling water does not efficiently reach the entire cooling chamber. At the same time as the cooling efficiency is low, the thermal expansion of the tip part of the chip body, which is in direct contact with the high-temperature molten metal, becomes large, causing the chip body to be distorted unevenly as a whole. In addition, there were problems such as shortening the life of the plunger tip and the injection sleeve.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of such a conventional problem, and allows the cooling water to efficiently spread to the tip of the chip body so that the tip of the chip body can be efficiently placed. Another object of the present invention is to provide a die casting plunger chip that can be cooled uniformly.

[0005]

According to the present invention, there is provided a die casting plunger chip for achieving the above object.
A plunger tip in which a tip body having a cooling chamber inside is connected to a tip of a plunger rod having a cooling water passage in a communicating manner, wherein a water-flowing tip is installed in the cooling chamber of the tip body. At the same time, the inside diameter of the cooling chamber at the tip end side is made larger than the other portion to form a cooling water chamber with the outer periphery of the tip portion of the water passing tip, and the cooling water passage is formed in the cooling water passage of the plunger rod. Is provided with a cooling water supply pipe, and the water passage tip has an inlet side passage communicating therewith with the cooling water supply pipe of the plunger rod, and branches off from the inlet side passage and opens into the cooling water chamber. A plurality of branch passages are formed, and a return-side passage communicating with a cooling water passage of the plunger rod is formed on an outer peripheral surface. In the die-casting plunger tip according to the second aspect, a gap is provided between the tip of the water-flow tip and the inner surface of the cooling water chamber, and a bypass passage is formed from the tip of the water-flow tip to the return-side passage. It is characterized by being at least done.

[0006]

An embodiment of the present invention will be described below with reference to the drawings. The chip main body A is formed in a substantially cylindrical shape having an outer dimension adapted to the inner peripheral surface of the injection sleeve C, and the cooling chamber 1 is formed by deeply digging the inside thereof. The tip 2 is installed coaxially in a fitting manner, and is connected to the tip of the plunger rod B in which the cooling water passage 3 is formed in a communicating manner.

The cooling chamber 1 is formed such that the inner diameter of the tip end side (the innermost part) of the tip main body A is larger than that of the other parts, and the water-permeable tip 2 fitted and installed coaxially. The cooling water chamber 11 is formed between the cooling water chamber 11 and the outer periphery of the tip portion, so that the cooling water is slightly stored in the cooling water chamber 11, that is, near the tip portion of the chip body A. At this time, an appropriate gap 13 is provided between the tip of the water passing chip 2 and the inner surface of the cooling water chamber 11 of the chip body A. In the case of the illustrated embodiment, the gap 13 at a required interval is secured by projecting the holding projection 24 at the tip of the water-flowing chip 2.
The holding projection 24 is not always necessary.

[0008] The water-flowing chip 2 receives the cooling water a supplied from the cooling water channel 3 of the plunger rod B in the cooling chamber 1 of the chip body A, specifically in the cooling water chamber 11 and the water-flowing chip 2.
Is formed in a substantially cylindrical shape having an outer diameter substantially equal to that of the small-diameter portion 12 of the cooling chamber 1 and having a length substantially equal to that of the cooling chamber 1. A plurality of branch passages 22 are formed in the core portion, and the plurality of branch passages 22 are formed so as to radially branch from the entrance passage 21 and open into the cooling water chamber 11 of the chip body A.
Further, a plurality of return passages 23 communicating with the cooling water passage 3 of the plunger rod B are formed on the outer peripheral surface.

The inlet side passage 21 of the water passing chip 2 has an opening formed in the shaft portion of the water passing chip 2 from the base end to the vicinity of the front end thereof, and the cooling water installed in the cooling water passage 3 of the plunger rod B therein. By inserting the supply pipe 4, it is connected to the cooling water supply pipe 4 of the plunger rod B so that the cooling water a can be introduced into the inside, and a sealing gasket 5 is installed at the base end side entrance portion. Thus, the return cooling water b in the cooling water passage 3 of the plunger rod B is shut off so as not to enter.

The branch passage 22 of the water-flowing chip 2 is radially branched and formed continuously from the leading end of the entrance-side passage 21.
That is, it is opened toward the inside of the cooling water chamber 11.

Further, the return side passage 23 of the water passing chip 2 is
A plurality of grooves are formed on the outer peripheral surface of the water-flowing chip 2 corresponding to the small-diameter portion 12 of the cooling chamber 1 at appropriate intervals in the circumferential direction from the vicinity of the front end to the base end along the longitudinal direction. , Each of which is communicated with the cooling water passage 3 of the plunger rod B.

At this time, when the return passage 23 is communicated with the cooling water chamber 11 of the cooling chamber 1, the cooling water in the cooling water chamber 11 does not flow to the tip of the water passing chip 2 and is directly returned to the return passage 23. 23, so as in the illustrated embodiment,
The return passage 23 is separated from the cooling water chamber 11 by the small diameter portion 12 of the cooling chamber 1, and at the same time, a bypass passage 25 is formed from the leading end of the water passing chip 2 to each of the return passages 23. It is preferable that the replaced cooling water a be guided from the bypass passage 25 to the return passage 23.

At the time of use, the water-flowing chip 2 is set in the cooling chamber 1 of the chip main body A in a fitting manner, and the chip main body A is screwed and connected to the tip of the plunger rod B.
The return passage 23 of the water passing chip 2 and the cooling water passage 3 of the plunger rod B communicate with each other, and a cooling water supply pipe 4 installed in the cooling water passage 3 of the plunger rod B, and a packing for sealing the water passing chip 2. 5 penetrates the water passing chip 2
To be inserted into the entrance passage 21.

When the cooling water a is supplied from the cooling water supply pipe 4 of the plunger rod B, the cooling water a passes through the plurality of branch passages 22 from the inlet side passage 21 of the water passing chip 2 and the cooling chamber of the chip body A. 1 is radially discharged into the entire cooling water chamber 11, heat exchange is performed while passing through the cooling water chamber 11 and the return side passage 23, and a tip portion of the chip main body A and an outer peripheral portion of the water passing chip 2. Is cooled.

That is, the cooling water a discharged into the cooling water chamber 11 is separated from the inner surface of the cooling water chamber 11 of the chip main body A by the water passing chip 2.
Through the gap 13 provided between the tip of the tip body and the bypass passage 25 of the water passing chip 2, the tip portion of the tip main body A is mainly cooled during this time. Then, the outer peripheral portion of the chip body is cooled while passing through the return side passage 23, and heat is exchanged as the return cooling water b to return to the cooling water passage 3 of the plunger rod B.

[0016]

The plunger tip for die casting according to the present invention has a water-flowing chip installed in the cooling chamber of the chip body in an inserted manner and the inner diameter at the tip end side of the cooling chamber is larger than that of other parts. The cooling water chamber is formed between the outer periphery of the tip portion of the water-flowing chip and formed to have a large diameter, a cooling water supply pipe is installed in a cooling water passage of the plunger rod, and the water-flowing chip has An inlet side passage communicating with the cooling water supply pipe of the plunger rod is formed therein, and a plurality of branch passages branched from the inlet side passage and open to the cooling water chamber are formed, and an outer peripheral surface thereof communicates with the cooling water passage of the plunger rod. Since the return passage is formed, the chip main body can be efficiently and uniformly cooled to its tip. That is, since the cooling water can be efficiently spread to the tip portion of the chip body and also to the entire tip portion of the chip body, particularly, the tip portion of the chip body that directly contacts the high-temperature molten metal is efficiently and uniformly cooled. As a result, the thermal expansion of the chip body can be suppressed, and at the same time, the chip body does not become unevenly distorted as a whole.

Further, according to the die-casting plunger chip of the second aspect of the present invention, a gap is provided between the tip of the water-flowing chip and the inner surface of the cooling water chamber, and the bypass extends from the tip of the water-flowing chip to the return passage. Since the passage is formed, the cooling water in the cooling water chamber surely flows from the gap provided between the tip of the water passing chip and the surface of the cooling water chamber to the return passage through the bypass passage, and therefore, The tip portion of the chip body can be more efficiently cooled.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line (2)-(2) of FIG.

FIG. 3 is a perspective view of the water-flowing chip according to the present invention.

[Explanation of symbols]

 A: Tip body B: Plunger rod 1: Cooling chamber 2: Water passing chip 3: Cooling water channel 4: Cooling water supply pipe 11: Cooling water chamber 13: Gap 21: Inlet passage 22: Branch passage 23: Return passage 25 : Bypass passage

Claims (2)

(57) [Scope of request for utility model registration] 1. A chip body (A) having a cooling chamber (1) inside.
Is connected to the tip of a plunger rod (B) forming a cooling water passage (3) in a communicating manner, and the water passing tip (2) is inserted into the cooling chamber (1) of the tip body (A). )
And the inside of the cooling chamber (1) is formed so that the inner diameter at the tip end side is larger than other parts, and
A cooling water chamber (11) is formed between the cooling water chamber (11) and the outer periphery of the tip of (2), and a cooling water supply pipe (4) is installed in a cooling water passage (3) of the plunger rod (B). The water chip (2) has an inlet passage (21) communicating with the cooling water supply pipe (4) of the plunger rod therein, and the cooling water chamber (11) branched from the inlet passage (21). A plurality of branch passages (22) opened inside and a cooling water passage for the plunger rod on the outer peripheral surface.
A plunger chip for die casting, wherein a return-side passage (23) communicating with (3) is formed. 2. A gap (13) is provided between the tip of the water-flow tip (2) and the inner surface of the cooling water chamber (11), and the return-side passage (from the tip of the water-flow tip (2)) The die casting plunger chip according to claim 1, wherein a bypass passage (25) is formed over the 23).