DE29803398U1 - Improvement of tool cooling and their sealing - Google Patents

Description

[File:ANM\LI5501 B1 .doc] Description,

Improvement of tool cooling and its sealing

Chih-miao LIN, Shenkang Hsiang, Taichung

Improvement of tool cooling and its sealing

The present invention describes the improvement of a cooling device for tools including their seal, in particular a cooling with a uniform, hermetically sealed water circuit for the purpose of quickly cooling the tool.

As can be seen in Figure 1, conventional tools for injection molding machines consist of an upper mold 10 and a lower mold 11, between which the workpiece 12 is injected. Since the molding process is only possible at high temperatures, the mold must be cooled before removal in order to prevent the workpiece 12 from deforming. In order to accelerate the cooling process, a water circuit is introduced into the lower part of the mold 11 in a cooling block 13, sealed with an O-ring 19 in an annular groove 133, whereby the water flows in a T-shaped cavity 130 with a partition wall 14, thus forming an inflow path 131 and an outflow path 132, while the partition wall extends into a cavity 110 in the lower part of the mold 11 and the mold is thus cooled by water which is introduced into the U-shaped cooling path 111 via the inflow path 131 and discharged from the mold via the outflow path 132.

The conventional design of the cooling device shown above has the following disadvantages:

CD The O-ring 19 is inserted directly into the annular groove 133 and is not firmly attached there, so that it is displaced in its position by the force of the water flow and thus endangers the tightness of the water circuit.

@ The sealing by the O-ring 19 in the groove 133 occurs at individual contact points instead of a contact surface and is therefore not of optimal quality.

[File:ANM\LI5501 B1.doc] Description, 25.02.4S98 *·.". ., ,J.

Improvement of tool cooling and its sealing

Chih-miao LIN, Shenkang Hsiang, Taichung

(3) Since the water flows in and out of the water path 11 in one direction, a first cooling zone 15 is created in the inflow path 131 and a second cooling zone 16 in the outflow path 132, in which, however, the water has already been warmed up by the first cooling zone 15 and has thus lost part of its cooling power. The cooling effect in both cooling zones is therefore not uniform, and consequently the shrinkage of the workpiece is greater in the front part and smaller in the rear section - a workpiece of inferior quality is the result.

® The U-shaped flow channel 111 creates an accelerated water flow with a short circulation time and thus uniform cooling is not achieved, which can lead to difficulties in post-processing.

For this reason, the inventor of the present claim, considering the disadvantages of conventional solutions, based on many years of experience in the manufacture and sale of tools for injection molding machines, after long studies, numerous experiments and constant improvements of the original design, has created the present invention with the following objectives:

Φ It is a main aim of the present invention to use an O-ring firmly embedded in a base to prevent it from slipping due to the forces of the water, thus hermetically sealing the system.

( ¹ I) It is a further object of the present invention to install an O-ring so that it lies between the lower mold part and the ring groove and achieves a higher degree of sealing with contact surfaces instead of contact points.

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[File:ANM\U5501 B1.doc] Description, 25.02.flS98~Si ' ······

Improvement of tool cooling and its sealing

Chih-miao LIN, Shenkang Hsiang, Taichung

@ It is a further object of the present invention to produce a ring base made of heat-resistant and heat-insulating material which cannot be deformed even in an oil circuit taking place at high temperatures and guarantees the secure position of the O-ring in order to hermetically seal the system.

Φ It is a further object of the present invention to design the water flow in the cavity of the molded part in a helical manner in order to achieve a uniform shrinkage amount of the workpiece, to extend the cooling period, and thus to create a higher quality workpiece.

The functional principle and structure of the present invention are described in detail below using figures.

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[File:ANM\LI5501 B1.doc] Description, 25.021998"**" ·· ··,

Improvement of tool cooling and its sealing

Chih-miao LIN, Shenkang Hsiang, Taichung

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Figure 1 is a cross-section of a conventional tool cooling device.

Figure 2 is an exploded view of the tool cooling device of the present invention.

Figure 3 is a cross-sectional view of the tool cooling device of the present invention.

[File:ANM\Ll5501 B1.doc] Description, 25.02>»998~ _ss Improvement of a tool cooling system and its sealing Chih-miao LIN, Shenkang Hsiang, Taichung

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Legend

10 Upper molding

11 Lower mold part 110 Cavity 111, 112 Cooling path 113, 133 Ring groove

12 Workpiece

13 Cooling circuit

131 Water influence

132 Water outlet 14, 23, 32 Partition wall

15 cooler zone

16 warmer zone 19,21,22,31 O-ring

2 Sealing device

201, 202 annular groove 203 passage

3 Cooling device 30 Base ring

301 Influence opening

302 Outlet opening 33 Screw

[File:ANM\LI5501 B1.doc] Description, 25.02.4998 "&« Improvement of a tool cooling system and its seal Chih-miao LIN, Shenkang Hsiang, Taichung

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As can be seen in Figures 2 and 3, the present invention essentially consists of a sealing device 2 and a cooling device 3, the sealing device 2 consisting of a non-metallic, heat-resistant and heat-insulating ring base 20, each having an annular groove 201, 202 on the top and bottom, into which an O-ring 21, 22 is fitted, the ring base 20 having a passage 203 in its center through which a partition wall 23 extends. This sealing device 12 is placed on the annular groove 133 of the cooling block 13, so that a T-shaped cavity 130 is formed by the partition wall 23 and is divided into a left and a right area and thus an inflow path 131 and an outflow channel 132. The design of the base 20 exerts strong pressure on the two O-rings 21 and 22 and prevents them from slipping while at the same time ensuring heat resistance.

The cooling device 3 consists of a base ring 30, an O-ring 31 on top of it, in the interior of the ring a partition 32 with a screw-shaped attachment 33, whereby the base ring 30 is attached to the ring groove 113 of the lower mold part 11, above the sealing device 2, so that the screw 33 penetrates into the cavity 110 of the lower mold part 11, and divides this into a screw-shaped flow channel 112 with an inlet opening 301 and an outlet opening 302, both of which are sealed off from one another by the partition 23 in the sealing block 2, so that the inlet path 121 leads to the inlet 301, and thus a more uniform cooling and a uniform shrinkage of the workpiece is achieved by the screw-shaped cooling path 112.

The operating principle of the present invention is described in detail below:

[File:ANM\LI5501 B1 .doc] Description, 25.02.1 S98 ··
Improvement of tool cooling and its sealing
Chih-miao LIN, Shenkang Hsiang, Taichung

1. Cooling circuit

As can be seen in Figure 3, after the mold is injected, the cooling process begins and cooling water is introduced into the cooling block 13 via the inlet path 131 and prevented from entering the outlet path 132 by the partition wall 23, instead the water flows through the inlet opening 301 into the base ring 30, then along the screw 33 from left to right, from front to back, from bottom to top, to the top of the cavity 110 and then along the back of the screw from left to right, from front to back and from top to bottom to the outlet opening 302 and the outlet path 132, so that the workpiece is better cooled due to the even distribution and flow direction of the water in the cavity 110 and, according to the laws of hydraulics, the flowability of the water is increased (the screw creates a mixing effect), thus accelerating heat dissipation. In addition, this prevents the formation of water spots or the accumulation of dirt deposits in the cooling path 112 and prevents it from becoming blocked. At the same time, this solution increases the cooling effect, ensures even heat dissipation and thus uniform shrinkage of the workpiece, and thus simplifies the post-processing of the molded part.

2. Sealing effect

As can be seen in Figure 3, the sealing device sits on the annular groove 133 of the cooling block 13, and on top of it the lower mold part 11, whereby the O-rings 21 and 22 lying in the annular groove 20 are pressed together, thus creating a wide contact surface between the annular groove 133 and the cavity 110 of the lower mold part 11, so that the water flows in via the inflow path 131 and the inflow opening 301 along the screw 33 and out via the outflow opening 302 and the outflow path

[File:ANM\LI5501 B1.doc] Description,

Improvement of tool cooling and its sealing

Chih-miao LlN, Shenkang Hsiang, Taichung

132 leaves the system without changing the position of the O-rings 21 and 22 (due to their tight fit in the groove 20).

From the above description, the following advantages of the present invention become apparent:

CD The helical cooling path ensures uniform shrinkage of the workpiece, increases the cooling time and thus improves the quality of the workpiece.

© The tight fit of the O-rings in the ring-shaped groove and the watertight seal with the ring groove of the cooling block ensure the tightness of the system.

&Phi; The tight fit of the O-rings in the annular groove ensures that the connection between the lower molded part and the annular groove is airtight and watertight.

&Phi; The use of heat-resistant, heat-insulating material prevents changes at high temperatures in oil circuits and prevents the O-rings from slipping.

The foregoing explanation of the present invention, although it explains the features and advantages of the present invention by means of a detailed structural and functional description, is to be understood as illustrative only. Changes in detail, particularly with regard to size, shape and arrangement of parts, are feasible within the scope defined by the following patent claims.

Claims (1)

Protection claims 1. A cooling and sealing device for tools, consisting essentially of a cooling device and a sealing device, wherein, the sealing device consists of a non-metallic, heat-resistant and heat-insulating ring base, which has an annular groove on the top and bottom, into which an O-ring is fitted; the ring base has a passage in its middle through which a partition extends, with the help of which a T-shaped cavity is formed and divided into a left and a right inflow path or outflow path. The design of the base exerts strong pressure on the two O-rings and prevents them from slipping while at the same time being heat-resistant; and the cooling device 3 consisting of a base ring, an O-ring on top of it, in the interior of the ring a partition with a screw-shaped attachment; whereby the base ring is attached to the ring groove of the lower mold part, above the sealing device, so that the screw penetrates into the cavity of the lower mold part and divides it into a screw-shaped flow channel with an inlet opening and an outlet opening *, both of which are sealed off from each other by the partition in the sealing block, so that the inlet path leads to the inlet, and thus a more uniform cooling and a uniform shrinkage of the workpiece is achieved.