JP2009107139A - Resin molding mold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin molding mold in which a base material of a pot and a plunger and a base material of a center block respectively have different thermal expansion coefficient and even when a resin enters into a gap between the center block and the pot in resin molding, the deformation of a pot upper end part to the inside of the pot is regulated. <P>SOLUTION: An inclination regulation part 80 for regulating the inclination that opening end side of a pot inner peripheral surface which faces a resin molding part side is inclined to the center side in the diameter direction of the pot is formed on the flat surface position of one or both of the center block 40 and the pot 44 in the resin molding part area where a molten resin 60Y is passed in the resin molding. The inclination regulating part 80 regulates the inclination due to a cured resin 60K formed by curing the molten resin 60Y in the resin molding by allowing the molten resin 60Y to flow into a gap formed in the boundary between a mounting hole 46 and the pot 44 and caused by the difference of the thermal expansion coefficient between the center block 40 and the pot 44. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a resin mold.

  In a resin mold composed of a fixed mold and a movable mold that moves toward and away from the fixed mold, the pot for supplying the resin to the cavity and the plunger are connected to the fixed mold or the movable mold via a center block. Arranged. The center block is made of a stainless steel material, whereas the pot and plunger are made of a so-called super hard material made of tungsten carbide and cobalt.

As described above, as a resin mold using a pot and a plunger formed of super hard material, for example, the one disclosed in Patent Document 1 has been proposed. Adopting a pot or plunger formed of super hard material is widely used because it can provide a resin mold having good releasability and high durability.
Japanese Utility Model Publication No. 6-29137

However, the super hard material is used only for the pot and the plunger, and the stainless steel material is used for the center block where the pot and the plunger are set. Thus, since the base material of the pot and the plunger are different from the base material of the center block in which they are set, the thermal expansion coefficient of the center block is larger than the thermal expansion coefficient of the pot. That is, when the pot and the center block are heated to the mold temperature at the time of resin molding, the thermal expansion amount of the center block becomes larger than the thermal expansion amount of the pot. In this case, a gap is formed between the center block and the pot, and the molten mold resin flows into the gap and then hardens. When the resin mold is cooled in such a state, the gap between the center block and the pot is narrowed, and the end of the pot falls to the inside of the pot by being pressed from the outer peripheral side by the cured resin that has entered the gap. There exists a subject that it will deform | transform so that it may become impossible to reciprocate the inside of a pot in a pot.
In addition, there is a significant temperature change when exchanging and maintaining the resin mold, and a thermal cycle such as a temperature drop when the mold is opened during resin molding or when the resin passes, and a temperature recovery from the lowered mold temperature is added. Even a pot made of super hard material may cause creep deformation. Eventually, the pot would be plastically deformed, and the problem that the plunger could not reciprocate in the pot became clear.

  In recent years, since the filler contained in the resin for resin molding has been miniaturized, the pot and plunger are formed with a very small difference (about 15 μm) between the pot inner diameter and the plunger outer diameter for the purpose of preventing resin leakage. Has been. For this reason, if a deformation occurs that causes the pot to fall inward even a little due to the cured resin cured in the gap between the center block and the pot formed during resin molding, the plunger cannot pass (reciprocate) through the pot immediately. There was no need to replace the plunger or pot.

  Therefore, in the present invention, when the thermal expansion coefficient of the base material of the center block in which the pot is set is larger than the thermal expansion coefficient of the base material constituting the pot, the resin is placed in the gap between the center block and the pot during resin molding. By providing an inclination adjusting part that adjusts (suppresses) deformation that the pot falls toward the center side in the radial direction at the opening end side of the pot when the resin is cured after flowing in, the inner peripheral surface of the pot is An object of the present invention is to provide a resin mold that prevents entry into a passage portion and that allows a plunger to surely pass through a pot during resin molding.

  That is, the present invention has a pot for storing a plunger for extruding a resin tablet, and a center block having a mounting hole for mounting the pot and a coefficient of thermal expansion larger than that of the pot. A resin mold having a resin molding part filled with a molten resin formed by melting the resin, wherein the molten resin passes at least during resin molding in one or both of the center block and the pot Inclination adjustment that adjusts the amount of inclination when the opening end side of the pot inner peripheral surface directed toward the resin molding portion side is inclined toward the center side in the radial direction of the pot at a planar position in the region of the portion And the inclination adjusting portion is used for thermal expansion between the center block and the pot during resin molding. After the molten resin flows into the gap formed at the boundary between the inner peripheral surface of the mounting hole and the outer peripheral surface of the pot due to a difference in coefficient, the molten resin is inclined by the cured resin formed by curing. The resin mold is characterized in that the tilt amount is adjusted.

Further, the center block is characterized in that a center block groove portion in which an inner peripheral surface of the mounting hole is formed in a concave shape on the opening end side is formed as a first inclination adjusting portion.
Further, the pot is characterized in that, as a second inclination adjusting portion, a pot groove portion in which the outer peripheral surface of the pot is formed in a concave shape on the outer peripheral surface of the pot on the opening end side is formed.
Further, the pot is characterized in that a thin-walled portion whose diameter increases as the inner peripheral surface of the pot approaches the opening end is formed as a third inclination adjusting portion.
As a result, even if the gap portion is deformed by the cured resin formed by curing the resin that has flowed into the gap portion during resin molding, the reciprocating movement of the plunger in the pot is not hindered and efficient. Resin molding is possible. The first inclination adjustment unit, the second inclination adjustment unit, and the third inclination adjustment unit may each be used alone, or may be used in combination.

In addition, the thin portion is formed in a tapered shape that gradually becomes thinner toward the opening end.
Further, the thin-walled portion is characterized in that it is formed in a cross-section R shape that increases in diameter so that the gradient with respect to the inner peripheral surface of the pot becomes steep as it approaches the opening end.
With these, when the molten resin that has flowed from the gap during resin molding is cured, even if the cured resin deforms the pot to the inside of the pot, it will not be deformed to the inside than the inner peripheral surface position of the pot, The reciprocating motion of the plunger in the pot is not hindered.

  Furthermore, the inclination adjusting part is formed in the whole area in the circumferential direction of the mounting hole of the pot and the center block. Thereby, the inclination adjustment of the pot by the cured resin can be performed more effectively. Moreover, since the machining of the tilt adjusting portion is facilitated, the manufacturing cost can be suppressed.

  By adopting the configuration of the present invention, the molten resin flows into the gap between the opening end side of the pot and the center block generated during resin molding due to the difference in thermal expansion coefficient, and the mold is cured after the resin is cured. Even if the temperature decreases and the gap width becomes narrow, the inner peripheral surface on the opening end side of the pot can be prevented from entering the passage portion of the plunger. That is, even if the resin is cured in the gap between the pot and the center block, the plunger can surely pass through the pot during resin molding. Since work etc. can be made unnecessary, a resin mold product can be manufactured efficiently.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
(First embodiment)
FIG. 1 is a plan view of a lower mold in the resin mold according to the first embodiment. FIG. 2 is a plan view showing the temperature of the resin mold and the state of the pot portion at room temperature. FIG. 3 is a cross-sectional view showing a state of the pot portion before resin molding. FIG. 4 is an enlarged cross-sectional view showing a state in the resin mold at the pot opening end side portion. FIG. 5 is an enlarged cross-sectional view showing a state after the resin molding of FIG. FIG. 6 is a plan view of a plastically deformed pot.
2, 3, and 4, (A) is a diagram showing a configuration having an inclination adjustment unit in the present invention, and (B) is a diagram showing a conventional configuration that does not have this.

As shown in FIG. 3, the resin mold 10 in the present embodiment is mainly composed of an upper mold 20 and a lower mold 30. Further, as shown in FIG. 1, a cavity 21 (shown by a broken line) is formed in the upper mold 20.
As shown in FIGS. 1 and 3, the upper die 20 is formed with a runner 24 for communicating the cull portion 50 and the cavity 21 after die matching. A space in which a resin portion that is filled and cured (thermoset) with resin during resin molding, such as the cavity 21, the runner 24, and the cull portion 50, corresponds to the resin molded portion in the present invention.

A center block 40 is disposed on the lower mold 30. The center block 40 includes a lower block 40A and an upper block 40B. In the lower block 40A and the upper block 40B, pot mounting holes 46 each having a shape along the outer diameter shape of the pot 44 provided with the projecting portion 42 are formed.
The pot 44 is set up to the height position of the protrusion 42 in the mounting hole 46 of the lower block 40A, and is arranged so that the protrusion 42 is pressed by the upper block 40B. The pot 44 is disposed with a slight gap 70 (about 2.5 μm at room temperature) between the inner peripheral surface of the mounting hole 46 and the outer peripheral surface of the pot 44 in the upper block 40B.
The plunger 48 has a diameter-enlarged portion that slides on the inner peripheral surface of the pot 44 and has an end portion on the side that presses the resin that is thick to a predetermined length. ) Possible arrangement. The resin tablet 60T is formed in a cylindrical shape using a thermosetting resin containing a fine filler, and is set on the plunger 48 for resin molding.

The pot 44 is formed of a so-called super hard material having a linear expansion coefficient (an example of a thermal expansion coefficient) formed by sintering tungsten carbide together with cobalt and having a coefficient of about 5.4 ppm / deg · ° C. On the other hand, the center block 40 in which the pot 44 is set is formed of a stainless steel material having a linear expansion coefficient of approximately 11.1 ppm / deg · ° C. and having a larger linear expansion coefficient than that of the super hard material.
As described above, the linear expansion coefficients of the base material of the center block 40 and the base material of the pot 44 are different, so that heat is generated between the center block 40 and the pot 44 under high temperature conditions such as resin molding. A difference in the amount of expansion will occur. Specifically, under the resin molding temperature (high temperature) condition shown in FIG. 2, the gap 70 between the inner peripheral surface of the mounting hole 46 of the center block 40 and the outer peripheral surface of the pot 44 is larger than the gap at normal temperature. Enlarge significantly. For this reason, a part of the molten resin 60Y (the one in which the resin tablet 60T is melted) that is pumped by the plunger 48 and is filled in the runner 24 and the cavity 21 from the pot 44 enters the gap 70 and hardens.

  Thereafter, when the resin mold molding is stopped for maintenance or the like, and the resin mold 10 is cooled and approaches room temperature, the enlarged gap 70 is gradually narrowed, and the cured resin 60K entering the gap 70 is centered. The block 40 is pressed by the inner peripheral surface of the mounting hole 46 and the outer peripheral surface of the pot 44. For this reason, the opening end side directed to the resin molding portion on the inner peripheral surface of the pot 44 is reversely pressed by the cured resin 60K and falls down toward the center side (inner side) in the radial direction of the pot 44 so that the diameter is reduced. It will be deformed. 2 (B) and 4 (B) are views showing the state around the pot 44 in the conventional configuration, but at the normal temperature, the opening end side (resin molding side) of the pot 44 is centered by the cured resin 60K. It will be in the state which changed greatly so that it may fall down to the side. For this reason, the plunger 48 cannot pass through the pot 44 even when the temperature is raised to the temperature at the time of resin molding.

Therefore, as shown in FIGS. 2A and 3A, in the present embodiment, the mounting hole of the upper block 40B is used as an accommodation destination of the molten resin 60Y that has entered the enlarged gap 70 during resin molding. A center block groove portion 80 as a first inclination adjusting portion in the present invention is formed on the inner peripheral surface of 46.
The center block groove portion 80 is formed as a concave groove that is recessed toward the center block 40 (upper block 40B) side so as to have a rectangular cross section at a position near the opening end of the pot 44. As shown in FIG. 2 (A), the center block groove portion 80 in the present embodiment is formed on the inner peripheral surface of the mounting hole 46 in the upper block 40B so as to form a ring shape along the entire periphery of the outer peripheral surface of the pot 44. It is formed all over the direction. Further, the volume of the center block groove 80 is formed to have a size sufficiently larger than the volume of the gap 70 between the center block 40 and the pot 44 formed at the time of resin molding.
In the present embodiment, as shown in FIG. 3A, the height of the center block groove 80 (the height of the inner wall surface of the center block groove 80 parallel to the outer peripheral surface of the pot 44) is set to 5 mm. The height dimension H2 of the upper block 40B was formed to 14 mm. Moreover, the height dimension H3 from the edge part by the side of the resin molding part of the center block groove part 80 to a parting surface was formed in about 0.3-1.0 mm.

Thus, the center block groove 80 is formed in a sufficiently large volume in the upper block 40B, and the molten resin 60Y that has flowed in during resin molding can be cured in an unfilled state.
More specifically, when the resin molding is first performed with the resin mold 10, the molten resin 60Y that has flowed into the enlarged gap 70 is fed into the center block groove 80 as shown in FIG. 4A. After curing, a cured resin 60K is obtained. In the internal space of the center block groove 80, the molten resin 60Y has a low pressure state compared to a space in which a predetermined resin pressure is applied to the molten resin 60Y filled like a resin molded portion. After it is formed, it hardens in an unfilled state (porous) like pumice. As described above, the cured resin 60K cured in a porous shape in the center block groove portion 80 has a lower density and a very low mechanical strength than the cured resin 60K cured in the resin molding portion.

  When the temperature of the resin mold 10 is lowered, the gap 70 is narrowed due to the difference in linear expansion coefficient between the pot 44 made of super hard material and the center block 40 made of stainless steel material. At this time, the cured resin 60 that has entered the gap 70 is pressed by the outer peripheral surface of the pot 44 and the inner peripheral surface of the mounting hole 46 of the center block 40 to exert a compressive force. In particular, the gap 70 returns to the original width (2.5 μm) for the relatively high-density cured resin 60K that is in the form of a band in the portion that is located above the center block groove 80 and faces the parting surface. A compressive force acts intensively to try. As a result, as shown in FIG. 5A, the relatively high density cured resin 60K cured at the gap 70 is partially destroyed.

However, since the cured resin 60K contains a large amount of filler, not all of the cured resin 60K cured in the gap 70 is compressed and broken, and the filler is elastically deformed or the upper block 40B is elastically deformed. Be made. As a result, the amount of deformation in the direction in which the inner diameter of the pot 44 is reduced is significantly smaller than that of the conventional configuration. For example, when comparing the configuration having the center block groove portion 80 with the dimensions described above and the conventional configuration in which the center block groove portion 80 is omitted from the same configuration, the deformation amount of the pot 44 is about 15 μm in the conventional configuration. Whereas the amount of deformation of the pot 44 is considerably large, the amount of deformation of the pot 44 is greatly reduced to about 2 μm. For this reason, as shown in FIGS. 5 (A) and 6 (A), the deformation inclined to the inner side of the pot 44 can be suppressed to a slight amount, and the pot 44 prevents the plunger 48 from reciprocating. It will not be.
Further, since the deformation amount of the pot 44 can be greatly reduced, the gap between the pot 44 and the plunger 48 can be designed to be small. As a result, the resin molding is performed using a resin filled with a finer filler. be able to. Note that the elastic deformation of the mold 40B returns to its original state when the temperature is raised during resin molding, and therefore does not affect the work during the next resin molding.

In the above, the resin mold mold 10 that can adjust (suppress) the deformation of the cured resin 60K to the inside of the pot 44 by providing the center block groove 80 has been described. Of course, the resin mold 10 provided with is not limited to this form.
In short, the molten resin 60Y that has flowed into the gap 70 generated during resin molding is cured in an unfilled state, and the pot 44 is not deformed so as to fall down in the center direction depending on the cured resin 60K cured at that portion. If you can. In other words, it is only necessary that only the high-density cured resin 60 </ b> K having a band shape in the portion located above the center block groove 80 and facing the parting surface can deform the pot 44. Therefore, as another embodiment, not the outer peripheral surface portion of the center block 40 on the opening end side of the mounting hole 46 but the outer peripheral surface portion of the pot 44 on the opening end side is recessed in the direction of biting into the outer surface of the pot 44. Further, it is possible to adopt a configuration in which a concave groove-like pot groove portion 82 corresponding to the second inclination adjusting portion in the present invention is formed (corresponding to a broken line portion in FIG. 4A). Also in this case, since the molten resin 60Y can be accommodated in the pot groove portion 82 and the deformation amount of the pot 44 can be reduced, the same effect as the above-described embodiment can be obtained. The center block groove portion 80 that is the first inclination adjusting portion or the pot groove portion 82 that is the second inclination adjusting portion is either a gap from the parting surface (the opening end side of the pot 44) toward the lower mold 30. After passing through 70, it is formed on the inner peripheral surface of the center block 40 or the outer peripheral surface of the pot 44 so that a space wider than the width dimension of the gap 70 is faced between the lumens of the mounting holes 46.

  If the resin molding die 10 adopting the configuration shown in the first embodiment is used, even if resin molding is repeatedly performed, the pot 44 is subjected to plastic deformation due to creep deformation. The inner peripheral surface of 44 does not contact and the vertical movement of the plunger 48 in the pot 44 is not inhibited (the state shown in FIGS. 5B and 6B). For this reason, as shown in FIG. 5A, the sliding space of the plunger 48 is reliably maintained between the outer peripheral surface of the plunger 48 and the inner peripheral surface of the pot 44. Therefore, in order to eliminate the problem that the plunger 48 cannot pass through the pot 44, the work of exchanging the pot 44 and the plunger 48 is unnecessary, and the resin molding can be smoothly performed. As a result, productivity is greatly improved. The effect of doing.

  Further, the center block groove portion 80 as the first inclination adjusting portion and the pot groove portion 82 as the second inclination adjusting portion are formed in a ring shape (over the entire circumference) along the outer peripheral surface of the pot 44. Therefore, the workability of the groove is easy, and the groove having a sufficient volume can be easily formed. Thereby, even if a large amount of molten resin 60Y flows from the gap 70, it is convenient because the molten resin 60Y can be accommodated with a sufficient margin.

(Second Embodiment)
FIG. 7 is a cross-sectional view of the vicinity of the pot portion showing a state in which resin molding is performed using the resin mold die according to the second embodiment. FIG. 8 is a cross-sectional view of the vicinity of the pot portion showing the state after the resin molding shown in FIG. FIG. 9 is an enlarged view showing the vicinity of the open end directed to the resin molding portion side of the pot shown in FIG.
As shown in FIG. 7, the resin mold 10 in the present embodiment is a thin portion on the opening end side of the pot 44 which is the third inclination adjusting portion in the present invention in which the member thickness on the opening end side of the pot 44 is thinned. Since the configuration is the same as that of the resin mold 10 of the above-described embodiment except for the point that is formed, description here is omitted.

  Specifically, as shown in FIGS. 7 to 9, the pot 44 has a taper in which the inner peripheral surface thereof increases in diameter and gradually becomes thinner as it approaches the opening end side (parting surface side). A thin portion 44T having a shape is formed. More specifically, the position of the outer surface of the pot 44 in the height range of the upper block 40B is vertical, and the position of the inner peripheral surface of the pot 44 approaches the opening end of the pot 44. Close to the surface position.

In this way, the deformation of the pot 44 during resin molding using the resin mold 10 provided with the center block groove portion 80 serving as the first tilt adjusting portion and the thin portion 44T serving as the third tilt adjusting portion. Will be described.
First, when the resin mold 10 is heated during resin molding, the molten resin 60Y enters the gap 70 formed, and as shown in FIGS. 7 and 8, the molten resin 60Y is cured by the cured resin 60K. The point which the deformation | transformation in which the opening end side of the pot 44 falls into the inside of the pot 44 arises is the same as that of embodiment mentioned above. The center block groove 80 is also adjusted (suppressed) so that the deformation of the opening end side of the pot 44 falling inward does not enter the sliding surface of the plunger 48 is the same as in the above-described embodiment.
In the case where the resin mold 10 of the present embodiment is used, the molten resin 60Y flows between the inner peripheral surface of the thin portion 44T and the outer peripheral surface of the plunger 48 as shown in FIG. Thus, the cured resin 60K is obtained. Subsequently, when the molded product formed in the cavity is removed from the resin mold 10, the cured resin 60K in this portion is removed together with the cured resin 60K in the cull portion 50, as shown in FIG. Only the portion of the center block groove 80 remains.

  In the present embodiment, since the portion on the opening end side of the pot 44 is formed in the thin-walled portion 44T having the one-taper shape as described above, as shown in FIG. Even if there is a large deformation (shown as a broken line in the figure) that causes the opening end side of the pot 44 to fall inward even though a certain center block groove 80 is formed, the inner periphery on the opening end side of the pot 44 It is possible to prevent the surface from entering the passage portion of the plunger 48. For this reason, the plunger 48 can pass through the pot 42 more reliably.

  In addition, although the resin mold mold 10 in the present embodiment has been described with respect to the form having the center block groove portion 80 that is the first inclination adjustment portion and the tapered thin portion 44T that is the third inclination adjustment portion, Of course, the resin mold 10 may be formed with only the thin portion 44T without providing the center block groove portion 80. Further, even with the resin mold 10 having such a configuration, it is possible to sufficiently adjust (prevent) deformation in which the inner peripheral surface on the opening end side of the pot 44 enters the sliding surface of the plunger 48. The vertical movement of the plunger 48 in the pot 44 is not hindered.

(Third embodiment)
FIG. 10 is a cross-sectional view showing a state of the resin mold mold according to the third embodiment at the time of resin molding. The resin mold 10 in the present embodiment is a modification of the second embodiment, and is characterized in that the third inclination adjusting portion is a thin portion 44R formed in a round shape. More specifically, the inner peripheral surface of the pot 44 gradually inclines with respect to the inner peripheral surface on the lower side of the pot as the portion of the required height range on the open end side of the pot 44 approaches the open end portion. It is formed in a thin-walled portion 44R having a rounded cross-sectional shape that is steeply inclined.

The radius of the thin portion 44R is inserted without contacting the lower corner of the enlarged diameter portion of the plunger 48 and the opening end of the pot 44 when the plunger 48 is inserted (attached) to the pot 44. Therefore, the size is sufficiently larger than the rounded portion for insertion provided. More specifically, the rounded portion for insertion is located on the lower side of the plunger 48 even if the lower corner of the enlarged diameter portion of the plunger 48 contacts the opening end of the pot 44 when the plunger 48 is inserted (attached). Since a corner | angular part should just be induced | guided | derived in the pot 44 by the rounded part, it may be comparatively small. On the other hand, the radius of the thin wall portion 44 </ b> R needs to be large enough to prevent the inner peripheral surface on the opening end side of the pot 44 from entering the passage portion of the plunger 48.
By adopting the configuration of the resin mold 10 according to the present embodiment, it is possible to obtain the same effects as those of the second embodiment. Moreover, since the thin-walled portion 44R having the rounded inner peripheral surface on the opening end side of the pot 44 can be used as an insertion rounded portion, it can be said that it is advantageous in terms of workability.
Also in the resin mold 10 in the present embodiment, the third inclination adjusting unit is formed without forming the center block groove portion 80 that is the first inclination adjusting unit, similarly to the resin mold 10 in the second embodiment. Of course, it is possible to have only the round-shaped thin portion 44R.

As described above, the present invention has been described in detail based on the respective embodiments. However, the present invention is not limited to the above embodiments, and other embodiments can be adopted.
For example, in all the embodiments, the center block groove portion 80 that is the first inclination adjustment portion and the pot groove portion 82 that is the second inclination adjustment portion are along the outer peripheral surface of the pot 44 within the plate thickness of the upper block 40B. However, all the inclination adjustment parts including the first inclination adjustment part are at least planar positions in the region of the resin molding part through which the molten resin 60Y passes at the time of resin molding, that is, What is necessary is just to be formed in the position in the area | region of the resin molding part on the top view (FIG. 1) which shows the center block 40 with which the pot 44 was mounted | worn. For example, in the configuration in which the resin passes through the resin molding portion in the above-described embodiment, the first inclination adjustment portion may be formed at least in the width of the runner 24 (see FIG. 1) and may be formed in a width larger than that. May be. Further, the first inclination adjusting portion may be arranged along the inner peripheral surface of the mounting hole 46 at a required interval as long as it is formed at a planar position in the region of the resin molded portion. A large space capacity formed by the first inclination adjusting unit is advantageous because the space for forming the porous cured resin 60K increases, and the adjustment of the inclination inward of the pot 44 is suitably performed. In addition, the cross-sectional shape of the first inclination adjusting portion is a concave shape having a rectangular cross section if the molten resin 60Y flowing from the gap 70 on the opening end side (parting surface side) of the pot 44 can be accommodated and cured in a porous shape. Of course, it is not limited to the shape, and an arbitrary cross-sectional shape can be adopted.

  The tapered thin portion 44T and the rounded thin portion 44R, which are the third inclination adjusting portions, are the openings of the pot 44 when the center block groove portion 80, which is the first inclination adjusting portion, is not formed. It is preferable to form it from a position as far away from the end as possible so that the formation distance of the thin portions 44T and 44R in the extending direction of the pot 44 is increased. In this case, since the opening end of the inner peripheral surface of the pot 44 is located on the outer side (a position away from the center of the pot 44), the opening end is located on the outer side even after deformation. Even if the deformation amount of the pot 44 is increased without the center block groove 80 being formed, it is possible to avoid a situation where the opening end of the pot 44 is inclined to a position where the passage of the plunger 48 is obstructed.

  Moreover, in the above embodiment, although the form which has arrange | positioned the pot 44 and the plunger 48 to the lower mold | type 30 is demonstrated, the form which arrange | positions the pot 44 and the plunger 48 to the upper mold | type 20 is employ | adopted. You can also.

It is a top view of the lower mold | type in the resin mold metal mold | die concerning 1st Embodiment. It is a top view which shows the state of the pot part in the temperature at the time of resin molding, and normal temperature. It is sectional drawing which shows the state of the pot part before resin mold shaping | molding. It is an expanded sectional view which shows the state in the resin mold in the pot opening end side part. It is an expanded sectional view which shows the state after the resin mold of FIG. It is a top view of the pot deformed plastically. It is sectional drawing of the pot part vicinity which shows the state which is resin-molding using the resin mold metal mold | die in 2nd Embodiment. It is sectional drawing of the pot part vicinity which shows the state after the resin mold shown in FIG. It is the enlarged view which took out and showed the opening end vicinity which faced the resin molding part side of the pot shown in FIG. It is sectional drawing of the pot part at the time of the resin molding in the resin mold metal mold | die in 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Resin mold 20 Upper mold 21 Cavity 24 Runner 30 Lower mold 40 Center block 40A Lower block 40B Upper block 42 Projection part 44 Pot 44R, 44T Thin part 46 Mounting hole 48 Plunger 50 Cal part 60T Resin tablet 60Y Molten resin 60K Curing Resin 70 Clearance 80 Center block groove 82 Pot groove

Claims (7)

A pot for accommodating a plunger for extruding a resin tablet, and a mounting block for mounting the pot and a center block having a coefficient of thermal expansion larger than that of the pot, and the resin tablet is melted during resin molding A resin mold having a resin molding part filled with a molten resin,
An opening end directed to the resin molding part side of the inner peripheral surface of the pot at least in a plane position in the region of the resin molding part through which the molten resin passes during resin molding in one or both of the center block and the pot An inclination adjusting portion is formed to adjust the amount of inclination when the side is inclined toward the center side in the radial direction of the pot,
The inclination adjusting portion is formed in a gap portion formed at the boundary between the inner peripheral surface of the mounting hole and the outer peripheral surface of the pot due to a difference in thermal expansion coefficient between the center block and the pot during resin molding. After the molten resin flows in, a resin mold mold characterized by adjusting the amount of inclination inclined by a cured resin obtained by curing the molten resin. 2. The resin according to claim 1, wherein a center block groove portion in which an inner peripheral surface of the mounting hole is formed in a concave shape on the opening end side is formed as the first inclination adjusting portion in the center block. Mold mold. The pot has a pot groove formed as a second inclination adjusting portion, in which the outer peripheral surface of the pot is formed in a concave shape on the outer peripheral surface of the pot on the opening end side. Or the resin mold metal mold | die of 2. 4. The thin pot portion having a diameter that increases as the inner peripheral surface of the pot approaches the opening end is formed as a third inclination adjusting portion in the pot. 5. The resin mold as described. 5. The resin mold according to claim 4, wherein the thin portion is formed in a tapered shape that gradually becomes thinner toward the opening end. 5. The resin mold according to claim 4, wherein the thin-walled portion is formed in a cross-sectional R shape that increases in diameter so that a gradient with respect to the inner peripheral surface of the pot becomes steep as it approaches the opening end. Mold. The resin mold according to any one of claims 1 to 6, wherein the inclination adjusting portion is formed in an entire region in a circumferential direction of the mounting hole of the pot and the center block.

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