KR20100040268A - An acute nozzle device for a hot runner probe - Google Patents

Abstract

PURPOSE: An acute nozzle device of a hot runner probe is provided to remove machining tolerance of micron size by forming a tip portion to enable different setting of the diameter of a gate. CONSTITUTION: A hot runner probe(1) has a runner passage, wherein the front end of the probe is formed in a conical shape and nozzle holes(9) are pierced in the tip portion of the front end. An external heating tip heater(5) is wound and a probe cover covers the outer circumference of the probe which has the tip portion. A groove is formed at the front part of the probe cover. The thermal energy of the tip heater is transmitted to the gate of a mold and resin in the mold is heated to be melted and molded. The resin is cooled and hardened by cutting off the current applied to the tip heater and a nozzle opens/closes the gate of the mold.

Description

AN ACUTE NOZZLE DEVICE FOR A HOT RUNNER PROBE}

The present invention relates to a sharp nozzle device having a tip heater of a hot runner probe.

Generally, in hot runner injection molding, a nozzle connected to a gate is provided at the tip of a runner passage provided with a molten resin passage, and a heating heater is wound around the nozzle to inject the heating heater. It is configured to control the molding operation on and off, and to control the molten resin of the nozzle portion by heating, melting or cooling to open and close the gate to perform molding with high precision.

And recently, the hot runner probe of the structure shown to Fig.8 (a) is known.

Referring to the drawings, 1a is a probe body, 2a is a runner portion formed in the probe body 1a in the longitudinal direction, 3a is a body heater wound around the probe body 1a, and 4a is a bush shape projecting in a cylindrical shape at the tip of the probe body 1a. Nozzle portion 5a is a tip heater of external heating wound around the outer circumference of the nozzle portion 4a, and 6a is a body cover which covers the external heating tip heater 5a and the body heater 3a of the nozzle portion 4a, and protrudes the nozzle portion 4a. It has a cone-shaped tip in a state.

7a represents a pair of molds to be opened and closed at the contact separation surface X, and the nozzle portion 4a needs a bush-shaped cylindrical portion Y to be correctly inserted into the recess Z of the gate 8a of the mold 7a.

By the way, in the conventional hot runner probe shown to Fig.8 (a), in the nozzle part 4a heated by the tip heater 5a, the bush-shaped cylindrical part must insert correctly into the recessed part Z of the gate 8a of the metal mold 7a. It is necessary to finish the precision of the gate 8a to a micron, and furthermore, the gate diameter G also becomes a limited diameter, and disadvantages such as high cost and prolonged time in the machining surface are inevitable. Moreover, in the case of a multistage structure, there existed a problem that the dimension of a gate space | interval cannot be reduced.

The present invention has been made in view of the above, and has a topless structure in place of the conventional bush-shaped cylindrical portion Y, and has a pointed tip portion by an external heating heater system, It is an object of the present invention to provide a sharp nozzle apparatus for a hot runner probe that can be provided in a similar configuration and at the same time obtain a hot runner probe having a narrow gate spacing.

The present invention for achieving the above object is as follows.

(1) A probe having a runner passage used in an injection molding machine of a hot runner, wherein the tip of the probe is formed in a conical shape, and at least one nozzle hole is drilled in the tip of the sharpest point, while a tip heater for external heating is used. The coil cover is covered with the probe cover on the outer circumference of the probe having the tip-shaped tip, and a groove is provided in the front portion of the probe cover to prevent the thermal energy of the tip heater from affecting the heat of the probe body, and thus the gate of the mold. The resin that is cooled and solidified in the nozzle hole is energized by the tip heater of the external heating to be melted and injected, and the resin is cooled and solidified by stopping the energization of the tip heater of the external heating. Stopping the injection, the nozzle is configured to open and close the gate of the opening and closing mold Sharp nozzle device for hot runner probe.

(2) The sharp nozzle apparatus of the hot runner probe of claim 1, wherein the nozzle holes are provided at two inclined sides opposite to each other in the direction of expansion and opening at the front end portion of the runner passage leading to the nozzle hole.

(3) A sharp nozzle apparatus for hot runner probes according to (1) or (2), wherein two or more probes can be provided in succession to form a multi-stage gate.

(4) A hot runner probe comprising two or more continuously installed probes as described in (3) above, by cutting both side surfaces that are continuously installed to each other to form a wound state of the body heater in an elliptical shape, and having the entire flat structure. Sharp nozzle device.

According to the present invention, since the pointed tip portion wound with a tip heater for external heating can be installed facing the gate of the mold, unlike a probe having a cylindrical cylindrical portion Y in the prior art, it is topless. It can be configured as an external heating similar to conventional internal heating. In addition, the pointed tip configuration allows the gate diameter to be set arbitrarily, eliminating the need for machining tolerances in the micron range, suitable for degrees of freedom and versatility, and in particular for multistage nozzle configurations. It has the effect of providing a hot runner probe of the gate.

Best Mode for Carrying Out the Invention Embodiments of the present invention will be described below with reference to the drawings.

Example 1

With reference to the drawings, numerals 1a to 8a denoted by reference numerals all show the conventional example as shown in Fig. 8 (a), and all numerals without a indicate the structure of the embodiment of the present invention.

1 is a probe body (hereinafter simply referred to as a 'probe'), 2 is a runner portion, 3 is a body heater, 4 is a pointed tip portion formed in a conical shape at the tip of the probe body 1, 5 is an external heating tip heater, 6 shows the body cover which covered the body heater 3 with the tip heater 5, and has the tip of the conical-shaped alpha in the state which protruded the said tip part 4 of the said sharp shape.

In addition, a ring-shaped groove U is formed on the inner circumference of the body cover 6 to prevent the thermal energy of the tip heater 5 from heat affecting the body portion, thereby improving molding accuracy.

7 denotes a pair of molds to be opened and closed at the contact separation surface X, and the tip 44 of the pointed tip 4 faces the gate 8 of the mold 7.

By the way, in the said tip part 4, the nozzle hole 9 which leads to the runner part 2 is provided in two places facing each other in the direction which expands and opens at the front-end | tip part of a runner passage. However, this nozzle hole 9 can also be provided in only one place of the other side.

In addition, in the figure, 10 represents a lead wire, and the electricity supply to the body heater 3 and the tip heater 5 is enabled. 11 is a ground line, 12 is a gate land portion formed annularly around the tip 44 of the pointed tip 4 leading to the nozzle hole 9 between the mold 7 and the gate diameter G can be formed.

According to the present embodiment, when the tip 4 of the conical pointed shape provided at the tip of the runner portion 2 meets the gate 8 of the mold 7, the alignment degree is matched with the mold in a topless structure, unlike the conventional bushing method. Since it is good, there is no need of high precision precision processing, and it can manufacture with high efficiency.

In addition, since the nozzle holes 9 are radially inclined in two directions facing each other, only the bidirectional or one direction can be used at the same time.

In addition, since the tip portion 4 has a pointed shape, the tip heater 5 can be formed to be sufficiently larger than the conventional example, similarly to the internal heating method, regardless of whether the tip heater 5 is an external heating method.

[Example 2]

This embodiment is based on the structure of the said Example 1, and arrange | positions it in parallel with two or more, and it is related with the hot runner probe provided with the some gate.

In the drawings, the same reference numerals are the same as the configuration of the first embodiment, so description is omitted.

Probe 1, 1... … Silver is installed and fixed as many as necessary on the fixed side of the single mold 7.

Each probe 1, 1... … The runner part 2, the body heater 3, the pointed tip 4, the tip heater 5, the body cover 6 and the nozzle hole 9 are the same as in the above embodiment. Another configuration is such that both sides of each of the runner portions 2 are cut to form the cut portions 13 so that the intervals between the gates 8 adjacent to each other can maintain a minute interval of 7 mm ² or less.

As a result, the body heater 3 wound on the outer circumference of the runner portion 3 becomes an ellipse shape, which allows the heater wire to be wound long, thereby ensuring a high capacity and a high density heater, and enabling high-performance and high-precision resin molding. .

In addition, since the effect is the same as that of Example 1 including an assembling work, description is abbreviate | omitted.

1 is a longitudinal side view of a hot runner probe showing one embodiment of a sharp nozzle apparatus of a hot runner probe according to the present invention;

2 is a front view of FIG. 1,

3 is an enlarged cross-sectional view of a tip portion having a pointed shape;

4 is a side view showing another embodiment of the present invention;

5 is a front view of the same combination state as above;

6 is a longitudinal cross-sectional side view of a single probe;

7 is an enlarged cross-sectional view taken along the line VII-VII of FIG. 6;

Fig. 8 is a longitudinal sectional side view of the conventional example (a) and a mold in order to prepare the structure of the present invention (b).

※ Explanation of code for main part of drawing

1,1a: probe body (probe) 2,2a: runner

3,3a Body heater 4,4a: Nozzle part

5,5a: Tip heater 6,6a: Body cover

7,7a: mold 8,8a: gate

9: nozzle hole 10: lead wire

11: Ground line 12: Ground gate part

13: The cutting edge 44: The cutting edge

α: conical G: gate diameter

X: Contact separation surface Y: Cylindrical section

Z: recess U: groove

Claims (4)

A probe having a runner passage used in an injection molding machine of a hot runner, the tip of the probe is formed in a conical shape, one or more nozzle holes are drilled in the tip portion of the pointed shape at the highest end, and the tip heater for external heating is wound. While covering the probe cover on the outer circumference of the probe having the tip-shaped tip, a groove is provided in the front portion of the probe cover to prevent the heat energy of the tip heater from reaching the probe main body to reach the gate of the mold. The resin that is cooled and solidified in the nozzle hole is energized by the tip heater of the external heating to be melted to enable injection, and at the same time, the resin is cooled and solidified by stopping the energization of the tip heater of the external heating to perform the injection. Stop and the nozzle is configured to open and close the gate of the opening and closing mold. Of the pointed nozzle device. The sharp nozzle apparatus of claim 1, wherein the nozzle holes are provided at two inclined sides opposite to each other in the direction of expansion and opening at the leading end of the runner passage. The sharp nozzle apparatus of claim 1 or 2, wherein the probe can be provided in succession to form a multi-stage gate. 4. The hot runner probe according to claim 3, wherein the two or more continuous probes are formed in a flat structure by cutting both side surfaces that are continuously installed with each other so that the wound state of the body heater is an elliptical shape. Nozzle unit

Images