JPH09193201A - Hot runner mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out an injection mold of a plastic suitable for multikind and small quantity production by improving the resin melting mechanism in a resin cannel from the manifold block of a hot runner mold to a parting line and enabling to reduce in shape the structure of a hot probe opposed to a cavity gate and a runner bush mounted to cover the probe as much as possible. SOLUTION: This hot runner mold 1 comprises in combination a hot probe 3 containing a gate heater 4 at the core end side for a manifold block 2 and disposed oppositely to a cavity gate 5 at the end of the heater 4, and a runner bush 6 combined in structure to cover the body outside of the probe 3 to secure a resin channel 3a. A body heater 8 is mounted on the outer periphery of the bush 6, and the molded parts of the upper side from the parting line are integrated so as to make it possible to be assembled and disassembled.

Description

Detailed Description of the Invention

[0001]

An object of the present invention is to improve a hot runner mold, which is one of the typical molds of plastic injection molds, and to connect a manifold block of the hot runner mold to a parting line. By improving the resin melting mechanism in the resin flow path, the hot probe desired for the cavity gate and the runner bush attached to it in a crown form a two-part structure, making it possible to miniaturize the hot runner mold as much as possible. , A hot runner mold with an improved structure that enables plastic injection molding suitable for high-mix low-volume production.

[0002]

2. Description of the Related Art In comparison with molding methods such as blow molding, synthetic resin injection molding has less burrs and shrinkage after molding, and the finishing process can be eliminated. Because it is effective for higher precision and cost reduction,
It is a typical plastic molding method in Japan, and the hot runner mold injection molding method, in particular, is a molding method that warms the runner, that is, the resin flow path, in advance to make the flow of the molten resin smoother. Since it is possible to improve the molding efficiency,
It has been adopted in many molding factories, but from the practical point of view, there is a structure in which the hot part (hot runner part) and the cold part (molded part) are very close to each other in the same mold. Therefore, it is difficult to control and manage such heat, and various improvements have been made to improve the heat.

The hot runner mold system is provided in the gate portion of the injection molding mold and heats and melts the resin between the injection molding machine heating cylinder and the cavity.
Many products have been developed and put into practical use in order to realize efficient synthetic resin molding without producing wasteful runner moldings. Among them, as a hot runner die adopting an internal heating method using a hot tip, a side sectional view of a main part of the conventional hot runner die of FIG. 3 and another conventional hot runner die of FIG. It is represented by the one shown in the side sectional view of the main part.

An outline of the structure of these conventional hot runner molds is as follows. The type shown in FIG. 3 which is inserted into the manifold block 51 in a penetrating state, and the tip side of which is provided so as to project toward the cavity block side disposed below the parting line L (normally movable side). The hot probe 53 of is formed into a shell shape having a substantially conical tip,
The cavity gate 54 is assembled so as to substantially coincide with the inside thereof. Further, on the outside of the hot probe 53, the base end portion is concentrically arranged and the base end portion is the manifold block 51.
The runner bush 56 has a cylindrical shape and is fitted to the cavity block 55, and a resin flow path 57 is formed between the runner bush 56 and the hot probe 53.

The resin flow path 57 is formed in the manifold block 5.
1 extends from a spool bush (not shown), has a tubular shape, passes through the outer peripheral portion of the hot probe 53, passes through the gate 54, and reaches the mold portion 52a of the lower cavity block 52. The hot probe 53 has a hollow portion 53a extending to the tip inside thereof, a gate heater 58 formed of a spear chip is provided in the tip portion, and a coiled body heater 59 is provided in the body portion. Lead wires 58a and 59a for supplying an electric current are connected, and a temperature sensor (not shown) is provided. The resin is heated and melted or cooled and solidified according to the injection timing of the resin, and the gate 54 is substantially It is possible to open and close the upper part, and by controlling the gate heater 58,
It is possible to easily take measures against the string pulling phenomenon from the gate and change the gate sealing time.

In the hot probe 53 having the built-in gate heater 58 and body heater 59 as described above, the fluidity of the resin can be secured within the range of 1 to 2 mm facing the hot probe 53. In the portion located outside the resin flow channel 57, heat radiation to the cavity block 55 or the back plate side thereabove is remarkable, and sufficient synthetic heat is not secured, and the synthetic resin is retained in the resin flow channel 57 as the retained material 57a. Especially runner bush 56
It is unavoidable that the resin 57 solidifies and remains on the inner peripheral surface side of the resin and remains in the resin flow channel 57.
Although it is recyclable, it requires a recycling process such as crushing, which is not economical and complicates maintenance work after the molding work is completed, which hinders rationalization of synthetic resin molding work. It was also one of the major factors.

On the other hand, the hot probe 63 of the type shown in FIG. 4 having a shape different from that described above is provided with a gate heater 68 and a body heater 69 therein, and has bifurcated groove portions 63a and 63a on the peripheral wall. Resin passages 67, 67 are formed by engraving from the base end to the tip, and the outer sides of the groove portions 63a, 63a are closed by a cylindrical runner bush 66 provided on the outer side thereof, and the outer side of the hot probe 63 is formed. It is configured so that two lines of molten resin flow.

However, even in the case of molding a synthetic resin by such a hot runner, it is difficult to prevent the adverse effect that the resin flowing in the runner portion, particularly the resin flowing outside, is accelerated, and as a result, the retained material 67a is formed. It remains, hinders the smooth flow of the resin, and lowers the cavity block 6
It is extremely important to ensure good molding conditions such that the resin pressure supplied into the second mold portion 62A is reduced, and the retained material 67a is accumulated on the cavity gate 64, which causes abnormally high injection pressure. It may become difficult and may cause defective molding.
A solution that suppresses or eliminates the occurrence of 7a has been strongly desired until now.

In order to meet such a demand, the inventor of the present application has started the development of a new hot runner die for preventing the cured resin stagnation 57a, 67a from being generated near the gate. As a result of reconfirming the effectiveness of the body heaters 59, 69 provided conventionally, the synthetic resin supplied from the manifold blocks 51, 61 side is in a high temperature state from the injection molding machine heating cylinder side (not shown). Supplied by the cartridge heater 51
Manifold block 5 heated by a and 61a
The resin flow paths 57, 67 between the hot probes 53, 63 heated by the body heaters 59, 69 and the runner bushes 56, 66 via the resin flow paths 57, 67 in 1, 61.
While passing through the portions, the high temperature is maintained in the central portions of the resin flow passages 57 and 67 to maintain the fluidity, but the heat of the molten resin on the peripheral wall surface side of the resin flow passages 57 and 67 is The heat of the body heaters 59 and 69 in the hot probes 53 and 63 is less likely to be transmitted to the peripheral wall surface side of the resin flow paths 57 and 67, in addition to being propagated and radiated to each part of the mold to cause the molten resin temperature to decrease. In addition, adverse conditions are added. Especially, in the outer portions of the cavity blocks 55, 65 near the water holes 55a, 65a, etc., heat is radiated to the cavity blocks 55, 65 side to lose fluidity, and the resin flow paths 57, 67 are surrounded by the peripheral wall surface side. Accumulated in 57
It has been found that a and 67a are generated for a while and adhere and remain without being melted.

Therefore, the inventor of the present application has found that the hot probe 5
I also tried to increase the heat capacity of the body heaters 59 and 69 in 3, 63, but to do so, it is necessary to increase the size of the hot probes 53 and 63 themselves, which is an important condition for the recent molding machines. Contrary to certain miniaturization,
The result is also against the demand for energy saving, and further, the heat insulation treatment for the gate heaters 58 and 68 becomes difficult, which makes the overall structure complicated and the durability with the gate heaters 58 and 68. Also, since there is a lack of balance in terms of the above, there is a risk of increasing the chances of maintenance and inspection due to a failure, which may affect the operation efficiency, leading to an increase in the size of the hot probes 53 and 63. We have come to know that there are limits to improvement measures.

The present invention is based on the above findings.
The hot runner mold heating section, which was finally reached as a result of repeated trial and error, aimed at improving and developing a hot runner mold that does not lead to the increase in size of the hot probes 53 and 63. The body heaters 59, 69 are separated and independent from the outside of the runner bushes 56, 66 by the one-part method of embedding them in the hot probes 53, 63 in the same manner as before, and only the gate heater is hot probe 53, 63. We have succeeded in completing and putting into practical use a hot runner mold with a new structure that was built into the 63 by the two-part system of the heating part.
In the following, the configuration will be described in detail with some embodiments representative of the present invention shown in the drawings.

[0012]

As clearly understood from the embodiments of the present invention shown in the drawings, the hot runner of the present invention basically has the following structure. That is, with respect to the manifold block of the hot runner mold, the hot probe with a built-in gate heater or a partially exposed internal part on the tip side of the core is arranged in a protruding shape in the resin flow path direction, And the cooling mechanism are arranged so as to face the cavity gate, and the resin flow path is secured outside the hot probe body protruding from the manifold block. The runner bush is assembled in a crowned shape, except for a predetermined area on the tip side including the heater built-in portion, while the heat generation and cooling action of the gate heater built in the tip side of the hot probe core on the outer peripheral surface of the runner bush. At least the body heater is attached to the outer peripheral surface that does not interfere with the cooling action, and the mounting plate, Two holding blocks, the back plate, in which the upper side of the mold each part from cab Byi tee block other parting line is a hot runner mold formed by the assembly and disassembly possible integrated.

The hot runner mold of the present invention having this basic structure is shown as a hot runner mold having a more preferable structure. A gate heater is provided on the tip end side of the core with respect to the manifold block of the hot runner mold. The built-in or partially exposed hot probe is arranged so as to project in the resin flow path direction, and the tip of the gate heater is combined so as to face the cavity gate in which the cooling mechanism is arranged. Together with the hot probe main body protruding from the manifold block, there is a combined structure in which a resin flow path is secured, and except for the tip side predetermined range portion including the gate heater built-in portion,
While the runner bushes are assembled in a crowned manner, a body heater is mounted on the outer peripheral surface of the runner bushes, and the hot probe body including the body heaters has a manifold block and mold parts other than a heat insulating ring interposed at the tip. It is a combination structure that is non-contact with the mounting plate, manifold block, back plate, cavity block and other parts on the upper side of the parting line so that they can be assembled and disassembled. It becomes a hot runner mold.

The gate heater is arranged on the tip end side of the core of the hot probe, and is arranged so as to substantially match the gate of the cavity block. The molten resin is pressure-fed through the cavity gate over the parting line. It is heated or cooled by turning off the power, and the cavity block cooling mechanism arranged in parallel near the place, for example, water temperature cooling in the water hole, temporarily cures the resin near the cavity gate and releases it. It eliminates the stringing phenomenon at the time, shortens the gate sealing time as much as possible, and again plays the function of melting the resin around the gate at the resin pressure feeding stage. Formed by bending and bending, made of an inorganic heating element called silicon, which is called Tecorundum (trade name), a superalloy, etc. In addition to materials that are already known or well-known, such as materials that generate heat when applied, or heaters that generate heat using arc discharge, electromagnetic induction heating, etc., new materials that will be developed in the future, It is of course possible to adopt a new structure or the like, and the hot probe is built in on the tip side of the core portion or partly as a protrusion from the tip of the hot probe.

In the core space of the hot probe, a lead wire for energizing the above-mentioned gate heater is wired, and is drawn to the outside from the upper end or midway thereof and connected to the control mechanism, and turned on / off at the molding timing. Is configured to be done. If necessary, a sensor for resin temperature can be built in a suitable place of the hot probe. As shown in the examples described below, the structure for incorporating the hot probe into the manifold block includes a built-in structure in which the hot probe is mounted in a penetrating manner from the upper end in the thickness direction, and the upper end of the hot probe is in close contact / contact form. Both of them are aligned with the outflow direction of the resin flow path of the manifold block and are arranged in a protruding shape on the cavity block side.

The runner bush is combined with the above-mentioned hot probe on the lower side of the manifold block in a crowned manner on the outside of the main body, and is a combination in which a resin flow path is secured between the hot probe and the outer peripheral surface. It must have a structure, and is formed into a cylindrical structure with a length that does not reach the tip side predetermined range part including the gate heater built-in part of the hot probe. Integrally combined with the road, so-called conventional hot runner mold structure or adopted in combination with the cavity block and other parts of the mold that will be arranged above the parting line, or, as in the examples below, The cavity block is not integrated so that it can be assembled and disassembled by a combined structure with a heat insulating ring. Re must.

The runner bush thus assembled may have a structure integrally combined with the outer peripheral surface of the runner bush, or a body heater may be combined with the runner bush so as to be detachable from the runner bush. The body heater is a tubular stainless steel heating element,
Alternatively, it is a heating element such as a nichrome wire wound around the outer circumference of the runner bush in a coil shape, and further, like the gate heater, it can be applied to arc discharge or electromagnetic induction heating. The principle of heat generation is not particularly limited, and in addition to all known or well-known materials and structures, it is naturally possible to adopt new materials and new structures that will be developed in the future. Needless to say, the material / structure is not particularly limited as long as it is a structure capable of efficiently and uniformly supplying the heat of fusion to the resin in the resin flow path from the outside.

However, this structure of the body heater combined with the outer surface of the runner bush has an outer periphery that does not interfere with at least the cooling function of the heat generation / cooling function of the gate heater built in at the tip side of the hot probe core. It must be confined to the surface, and the adoption of an insulating ring is extremely effective to alleviate this limitation. It is desirable to use a metal or an inorganic material, which has extremely low thermal conductivity, as this heat insulating ring, which is hard and can withstand pressure contact between the cavity block and the runner bush, and can withstand large temperature changes that occur when opening and closing the gate. With thermal shock resistance, it is optimal to be formed of, for example, ceramics, and the resin in the resin flow path with the heat insulating ring as a boundary is formed into a structure that does not interfere with each other in heat propagation,
It is desirable to make the function of the gate heater more accurate.

The desired heat insulating function can be ensured even if the heat insulating ring has a simple cylindrical shape.
By changing the shape of the resin flow passage by narrowing the diameter of the flow passage, the shape of the resin flow passage can be changed, the fluidity of the resin can be improved, and the generation of stagnant matter can be effectively suppressed. By applying helical processing to the opposite end of the hot probe, more efficient resin flow can be achieved, and heat transfer interference between resins in the resin flow path with the heat insulating ring as a boundary. The structure may be such that the action can be further reduced.

The runner bush including the body heater, except for the base end side and the tip end side (in the case of the structure having the heat insulating ring interposed, the front end side through the heat insulating ring), Combined with each part of the mold arranged above the parting line in a non-contact manner,
It is desirable to have a structure in which the heat from the body heater is concentratedly propagated to the runner bush side, and by adopting that structure, a structure that makes repairing or replacing the body heater or the runner bush including the body heater advantageous. It also leads to realization. In addition, the hot runner mold that is basically composed of the above structure does not restrict the number of gates formed in one cavity block, so that the resin can be sent to multiple cavity blocks at the same time. It can also be used as a molding die having the above structure. Hereinafter, the configuration of the hot runner included in the present invention will be described in detail with reference to the embodiments shown in the drawings.
It should be possible to grasp more concretely and clearly.

[0021]

Embodiment 1 First, the case shown in the side cross-sectional view of the main part of the hot runner die in FIG. 1 is the most typical embodiment having the basic configuration of the present invention. , One of the cases where the manifold blocks are combined so as to penetrate in the thickness direction. The hot runner mold 1 includes a pair of hot probes 3, 3 having the same structure and having the same structure, which are penetrated by the manifold block 2.
The hot probe 3 is also formed in a conical shape in which the tip side is gradually reduced in diameter, and the core portion is formed in a hollow shape by hanging from the base end portion to the tip portion, and the tip portion, The gate heater 4 composed of a spear chip is mounted in an embedded state, and the lead wire 4a is connected through the body portion.
Thus, the heating state is automatically controlled from the outside according to the molding conditions such as the molding cycle and the detected value of the temperature sensor.

Further, in the manifold block 2, resin flow paths 2b, 2b, which are branched from the spool bush 2a and communicate with each other, extend in an intersecting manner at the respective bases of the pair of hot probes 3, 3, both of which are provided. It joins the flow paths 3a, 3a formed along the outer wall of the housing of the hot probe 3,
It is formed so as to reach the cavity gates 5 and 5.
A runner bush 6 having a base end fitted to the manifold block 2 and a tip joined to the heat insulating ring 6a is detachably attached to the outside of the hot probe 3. The heat insulating ring 6a uses a metal or an inorganic material having a low thermal conductivity to prevent the heat of the hot probe 3 from being radiated toward the cavity block 7 side, and the flow paths 3a, 3a.
Has a diameter-reduced portion so as to narrow a part of the inner peripheral surface of the inner peripheral surface of the inner peripheral surface, which has a slit effect. Furthermore, the heat insulating ring 6a
Helical processing (not shown) is performed on the hot probe 3 in the vicinity in order to eliminate the retention of the resin.

A cylindrical body heater 8 having a cylindrical shape is fitted on the outer peripheral wall surface of the runner bush 6, and is provided so as to be removable from the runner bush 6 or the manifold block 2 together with the runner bush 6. . That is, the tubular body heater 8 is provided separately from the hot probe 3, and has a structure in which it can be detached as a completely separate component when disassembled.

A cooling water hole 7a is formed near the gate 5 of the cavity block 7, and the gate 5 is closed by cooling and hardening the resin, and the cavity block below the parting line L is closed. (Normal,
It is used to ensure the effect of rapidly cooling the molded product in the mold part 9a of the movable side cavity block) 9. On the other hand, the manifold block 2 is provided with a thermocouple 2c and a cartridge heater 2d. The hot runner 1 is feedback-controlled by a control device (not shown) based on the detected temperature to automatically cool and heat.

[0025]

[Embodiment 2] In the case shown in the side cross-sectional view of the main part of another hot runner die 21 in FIG. 2, the hot probe 23 is in close contact with and abuts on the lower surface side of the manifold block 22, and the tip portion thereof is One of the typical embodiments is shown in which the gates are combined with the cavity block 27 so as to face the gate 25. The hot probe 23 has a hollow portion formed from the base end of the core to the tip.
A lead wire 24a inserted through the hollow portion is adapted to apply a predetermined voltage to the gate heater 24 embedded in the tip portion.

A pair of tubular flow passages 23a, 23a are formed on the outer side of the hot probe 23, and the upper and lower ends of the flow passages 22 are formed in the manifold block 22.
It communicates with b and the gate 25. Hot probe 23
A runner bush 26, the base of which is joined to the manifold block 22 at a predetermined pressure, is attached to the outside of the crown block in a coronal shape. The heat insulating ring 26 is provided in a portion facing the cavity block 27 on the tip side of the runner bush 26.
a is provided and is joined to the cavity block 27 via the heat insulating ring 26a. In addition, the inner wall surface of the heat insulating ring 26a is formed in a convex shape inwardly so as to narrow a part of the resin flow path 23a and to provide a slit effect.

Further, a cylindrical body heater 28 having a cylindrical shape is fitted on the outer peripheral wall surface of the runner bush 26, and is provided so as to be removable from the runner bush 26. In other words, the cylindrical body heater 28 is incorporated as a separate body from the hot probe 23, and realizes a two-part structure as a heating part, and in the case of disassembly, it can be taken out as a completely separate part individually. It is configured. In the vicinity of the gate 25 of the cavity block 27,
A cooling water hole 27a is provided, and the manifold block 22 is provided with a thermocouple 22c, a cartridge heater 22d, and the like.

[0028]

[Operation] In the hot runner 1 of the present invention configured as described above, the resin pressure-fed from the injection molding machine heating cylinder (not shown) toward the cavity 9
High flowability is ensured by heating by the tubular body heater 8 when reaching the gates 5, 5 through the flow paths 3a, 3a, ... Positioned outside the respective hot probes 3, 3 through b, 2b. Generation of stagnant substances is prevented. The runner bush 6 with the tubular body heater 8 exterior is supplied from the tubular body heater 8 because the heat transfer is blocked by the heat insulating ring 6a interposed at the joint with the cavity block 7. The generated heat is efficiently supplied to the resin in the flow paths 3a, 3a, ... Without being radiated to the cavity block 7 side.

Further, the gate heaters 4 and 4 provided at the tips of the hot probes 3 and 3 are automatically controlled from the outside to receive the applied voltage and generate heat to generate the gate 5.
After the resin is opened as a molten state and the resin is sufficiently supplied to the cavity 9, the voltage application is stopped and the resin is rapidly cooled by the cooling water passing through the cooling water holes 7a, 7a ,. The cavity gates 5 and 5 are configured to be quickly cured to be closed.

[0030]

[Effect] Above all, the hot runner die of the present invention configured as above is, above all, the gate heater 4 provided at the tip of the hot probe 3 and the tubular body heater 8 provided outside the runner bush 6. The main feature is that the heating parts of the two-parts structure are configured by assembling them separately and assembling them, and only the gate heater is arranged in the hot probe, By simplifying the internal structure of the device, the gate heater part, which had to be divided into structures in the conventional structure, can be integrated with the hot probe, and the wiring etc. can be simplified so that there is no error due to wiring mistakes. The non-defective rate can be reduced and the manufacturing cost can be reduced. In addition, the body heater is provided separately from the hot probe, so it can be easily attached and detached. It is possible not only to remove the target body heater at the time of inspection and maintenance or replacement, but also for the gate heater, the inspection and maintenance and replacement of parts do not involve the hot probe at all. Since it can be carried out easily, the man-hours for maintenance and inspection can be greatly reduced as a whole, and the excellent effect that it will be very useful for labor saving can be obtained.

Furthermore, since the conventional hot probe has a large number of internal structures, when trying to accommodate them in a limited member cross section, the hot probe main body becomes thin-walled, and the temperature difference between the parts becomes so severe. While the heat may adversely affect the resin, the internal structure of the hot probe of the hot runner mold of the present invention can be simplified and the hot probe can be downsized accordingly. Since the thickness of the resin itself can be increased, the effect of heat transfer can be made uniform, and local abnormal heating can be eliminated. It has almost no adverse effect, which makes it possible to reliably manufacture high quality resin molded products. To have.

On the other hand, the body heater can be easily attached without impairing the function of the gate heater, and the heating performance can be improved as compared with the conventional body heater of the hot probe. Therefore, it becomes easier to maintain the fluidity of the resin in a better condition than before.In particular, with the structure that a heat insulating ring is interposed between the cavity block and the runner bush,
Since the adverse effect that the heat from the body heater is radiated to the cavity block side can be minimized, the effect can be more remarkable, and further, the resin flow path is partially narrowed by forming a convex shape inward. With such a configuration, the effect can be further enhanced and the effect of smoothing the resin flow in the cavity gate direction can be expected. It can be realized.

In particular, according to the first embodiment, the length of the hot probe 3 (that is, the length of the runner bush 6) as well as the general operation and effect of the present invention described above.
Even if the temperature is changed, it is possible to easily replace only the body heater 8 with one that matches the length, heat the entire resin flow path in that portion substantially uniformly, and manage the temperature to the optimum temperature. Since all the resins in 3a are kept in a very good molten state, there is no need to use the resin flow paths 57, 67, etc. that predict the generation of resin stagnation unlike the conventional ones. Can be set to a small value, which is particularly excellent for downsizing the hot runner mold 1, and in the case of the hot runner mold 21 according to the second embodiment, the description based on the basic configuration of the present invention. Of course, the branched tubular resin flow path 23
With a and 23a, the cross section of each resin flow path 23a can be kept small, which enables molding with a reduced injection pressure, and enables the manufacture of extremely high quality and highly accurate resin molded products without resin burning. Is.

As described above, the hot runner according to the present invention has to spend a great deal of time as a countermeasure against the above-mentioned hot runners already in widespread use, because the residual resin remains inevitably. On the other hand, it succeeded in almost eliminating the residuals of the resin residue, and made it possible to largely omit the working process for removing them, and also without waste of the resin raw material. ,
Moreover, since the heating part of the hot runner mold can be easily made into parts, and repairs and inspections can be simplified, leading to savings in parts costs, it is possible to secure extremely high production efficiency and greatly reduce product prices. It will be possible to make a contribution, and it is expected that an extremely high evaluation will be made by the plastic product industry in Japan, which is intensifying due to the increase in imported products from overseas.

[Brief description of the drawings]

The drawings show some typical examples and conventional examples embodying the technical idea of the hot runner mold of the present invention.

FIG. 1 is a side sectional view of a main part of a hot runner die included in the present invention.

FIG. 2 is a side sectional view of a main part of another hot runner die included in the present invention.

FIG. 3 is a side sectional view of a main part of a conventional hot runner die.

FIG. 4 is a side sectional view of a main part showing another conventional hot runner die.

[Explanation of symbols]

 1 Hot Runner Mold 2 Manifold Block 2a Spool Bushing 2b Resin Flow Path 2c Thermocouple 2d Cartridge Heater 3 Hot Probe 3a Resin Flow Path 4 Gate Heater 4a Lead Wire 5 Cavity Gate 6 Runner Bush 6a Insulation Ring 7 Cavity Block 7a Cooling Water Hole 8 Body Heater 9 Cavity Block 21 Hot Runner Mold 22 Manifold Block 22a Spool Bushing 22b Resin Flow Path 22c Thermocouple 22d Cartridge Heater 23 Hot Probe 23a Resin Flow Path 24 Gate Heater 24a Lead Wire 25 Cavity Gate 26 Runner Bush 26a Insulation Ring 27 Cavity block 27a Cooling water hole 28 Body heater

Claims (6)

[Claims] 1. A hot runner die manifold block, wherein a hot probe having a built-in gate heater or a partially exposed internal portion on the tip side of the core is arranged in a protruding manner in the resin flow path direction, and the gate thereof is provided. A combination structure in which the heater tip portion is combined so as to face the cavity gate in which the cooling mechanism is provided in parallel, and a resin flow path is secured outside the hot probe main body protruding from the manifold block, In addition, the runner bush is assembled in a crowned shape except for a predetermined area on the tip side including the gate heater built-in portion, while the heat generated by the gate heater built in the tip side of the hot probe core portion on the outer peripheral surface of the runner bush.・ Attach the body heater to at least the outer peripheral surface that does not interfere with the cooling action. A hot runner mold in which parts such as attached plates, manifold blocks, back plates, cavity blocks, and other parts above the parting line are assembled and disassembled into a single unit. 2. A hot runner mold manifold block is provided with a hot probe having a built-in or partially exposed gate heater on the tip end side of the core, and the hot probe is arranged so as to project in the resin flow path direction, and the gate thereof is provided. A combination structure in which the heater tip portion is combined so as to face the cavity gate in which the cooling mechanism is provided in parallel, and a resin flow path is secured outside the hot probe main body protruding from the manifold block, Moreover, the runner bush is assembled in a coronal shape except for a predetermined range portion on the tip side including the gate heater built-in portion, and a body heater is attached to the outer peripheral surface of the runner bush, and a hot probe including the body heater. The main body is not attached to each part of the mold except the heat insulating ring that is interposed at the manifold block and the tip. A hot runner mold in which the mounting plate, manifold block, back plate, cavity block and other parts on the upper side of the parting line are assembled and disassembled into a single contact structure. . 3. A crowned shape in which a runner bush or a runner bush and a heat insulating ring are provided outside the hot probe body protruding from the manifold block, and a predetermined gap is secured between the runner bush or the inner circumferential surface of the runner bush and the outer circumferential surface of the hot probe body. 3. The hot part according to claim 1 or 2, wherein a main portion of the gap between the two that is in contact with the inner peripheral surface of the runner bush is a resin flow path under the influence of heating of the body heater. Runner mold. 4. The hot probe main body outer axial direction or the runner bush inner axial direction facing the resin flow path, or both axial directions corresponding to each other, or the runner bush and the heat insulating ring each inner axial direction, or Grooves or through-holes are formed in both the inner axial direction and the corresponding hot-probe main body outer axial direction, and the main portion where the runner bush is crowned is formed in the groove or through hole by the body heater. The hot runner die according to claim 1 or 2, wherein the hot runner die is a resin flow path under the influence of heating. 5. The hot runner mold according to claim 1, wherein the body heater is used alone or is detachably combined with a runner bush. 6. The heat insulating ring is formed in a shape that reduces the diameter of the resin flow passage, and the resin in the resin flow passage having the heat insulating ring as a boundary is less likely to interfere with each other in heat propagation. The hot runner die according to any one of claims 1 to 5, wherein