JPH0566245B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention provides an axially symmetrical component using a thermoplastic resin.
For example, the present invention relates to an injection compression molding mold used for injection compression molding a plastic lens, and particularly to an injection compression molding mold that aims to improve the axial symmetry of the lens surface shape and the lens surface precision.

[Background of the invention]

Plastic cleansing using thermoplastic resin is
Manufactured using injection compression molding method (Plastics
Age Encyclopedia 1981, p148-163). Using this injection compression molding method, when measuring the lens surface accuracy of a plastic lens molded using a normal injection compression mold with high precision on the micron order, molding shape distortions such as "warpage" and "sink marks" are always observed. There were problems with the lens surface precision, and the axial symmetry of the lens surface shape. According to this conventional injection compression molding method, the heat distortion temperature of the resin (approximately 110℃ for PMMA resin and approximately 130℃ for PC resin)
After injecting high-temperature molten resin at about 190 to 250 degrees Celsius into the injection compression mold, which is maintained at a constant temperature of about 40 to 90 degrees Celsius, it is A plastic lens was molded by applying compressive force to the resin filled inside and cooling and solidifying the resin.

In such conventional injection compression molding methods, there is a large temperature difference between the injection compression mold and the resin injected into the cavity, and the high temperature molten resin injected into the cavity is heated at a temperature of about 50 to 10°C/min. It is cooled at a rapid cooling rate of . Therefore, large temperature non-uniformity occurs in the resin within the cavity, and the resin is cooled and solidified while having large temperature non-uniformity. As a result, the shrinkage of the resin (plastic lens) after molding is large and uneven in each part of the resin, so "sink marks" occur in thick parts that were hot inside the resin, and the temperature of the entire resin is uneven. It is thought that thermal stress caused by this occurs, resulting in "warping" deformation. This can be achieved by traditional injection compression molding methods.
This is believed to be the reason why a high precision plastic lens with a lens surface precision on the micron order cannot be obtained by molding using a normal injection compression mold.

As a prior art related to the molding of plastic lenses, there is Japanese Patent Application Laid-Open No. 187232/1983. The plastic lens molding method described in the same publication compresses the resin in the mold, and when the temperature of the resin in the mold reaches a predetermined temperature, the specific volume of the resin in the mold is reduced by at least a predetermined temperature. In order to keep the mold temperature constant, the compression force and the cavity volume are controlled to keep the cavity volume constant.However, regarding mold temperature control,
``One guideline for the temperature at which the cavity volume begins to remain constant is the glass transition point,'' and ``transition conditions that are mainly based on temperature changes are selected as necessary.'' There is no specific description of the mold temperature conditions necessary to obtain a plastic lens molded product without leaving any residue.

Further, a conventional injection compression mold that has been used will be explained with reference to the drawings.

FIG. 3 is a schematic partial cross-sectional view showing a conventional injection compression mold for two-cavity molding, and FIG. 4 is a lens surface of a concave lens molded by the injection compression mold according to FIG. FIG. 3 is a schematic cross-sectional view of main parts showing the shape.

In FIG. 3, 1 is a cavity, 8 is a side surface of the cavity 1, and 2 and 3 are cooling holes that are parallel to the edges 4 and 5 of the injection compression mold 7 and are bored near the cavity 1. , 6 is a runner gate for supplying resin into the cavity 1, B,
B' indicates the cooling holes 2 and 3 in the cavity side surface 8.
The shortest distance points C and C' from the cavity side 8
Among them, this is the point with the longest distance from the cooling holes 2 and 3.
Although not shown, the left side of the mold has the same configuration as the right side.

A concave lens 10 is molded into the cavity 1 by the injection compression molding mold 7 configured as described above.
has a shape as shown in FIG. That is, for the lens shape a of the optical design,
The lens surface shape corresponding to the BB' cross section was as shown in b, and the lens surface shape corresponding to the CC' cross section was as shown in c, and the axial symmetry with respect to the lens center axis 9 was poor.

For example, in the case of a PC resin concave lens with a diameter of 47 mm, a minimum thickness of 3.5 mm, a maximum thickness of 12.7 mm, and a radius of curvature of 250 mm and 30 mm, the lens surface shape c is at most 1.5 μm with respect to the optically designed lens surface shape a. Furthermore, the difference between lens surface shapes b and c was 1.2 μm at maximum.

This loss of axial symmetry occurs not only in concave lenses but also in convex lenses, and the larger the lens diameter, the worse the axial symmetry of the lens surface shape. Furthermore, in the case of multi-cavity molding, the axial symmetry of the lens surface shape was even worse than in single-cavity molding.

As mentioned above, plastic lenses molded by the conventional injection compression molding method using a normal injection compression mold may have a negative impact on the optical performance of the lens, especially when the lens diameter is large or when molding multiple pieces. There are problems with the axial symmetry of the important lens surface shape and lens surface precision, and improvements to these have been desired.

[Purpose of the invention]

The present invention was made in order to solve the problems of the above-mentioned conventional technology, and the present invention has been made in order to solve the problems of the above-mentioned conventional technology.
To provide an injection compression molding mold capable of molding a plastic lens with excellent axial symmetry of the lens surface shape and excellent lens surface precision with high production efficiency even when the lens surface shape is 40 mm or more or when molding multiple pieces. This is its purpose.

[Summary of the invention]

The configuration of the injection compression molding mold according to the first invention is as follows:
A fixed mold and a movable mold are arranged facing each other and are provided with a sliding piece in at least one of the formworks via a bushing or directly, and a mold or a mold opposite to the said filling piece. a cavity formed between the inserting piece and into which resin can be filled; a hydraulic cylinder that generates a pressing force for pressing the inserting piece; and a heating and cooling of the fixed mold and the movable mold. In the injection compression molding mold, the cooling means is provided on the cavity center axis of the input piece, or on the input piece or the bush, in a circle concentric with the side surface of the cavity, centered on the cavity center axis. Cooling holes are formed in a spiral shape, a spiral shape, or at equal intervals in the circumferential direction, into which a cooling medium can flow; The bush is provided with heating holes that are formed in a spiral shape, a spiral shape, or at equal intervals in the circumferential direction in a concentric circle with the side surface of the cavity, centering on the center axis of the cavity, into which a heating medium can flow. In the case where the bush is interposed between the bush and the formwork, in the case where the bush is not interposed, a heat insulating layer is provided between the insert piece and the formwork in a concentric circle with the side surface of the cavity.

The configuration of the injection compression mold according to the second invention is as follows:
A fixed mold and a movable mold are arranged facing each other and are provided with a sliding piece in at least one of the formworks via a bushing or directly, and a mold or a mold opposite to the said filling piece. a cavity formed between the inserting piece and into which resin can be filled; a hydraulic cylinder that generates pressure for pressing the inserting piece; and heating and cooling the fixed mold and the movable mold. In the injection compression molding mold, the cooling means is provided on the cavity center axis of the input piece, or on the input piece or the bush, in a circle concentric with the side surface of the cavity, centered on the cavity center axis. The cooling holes are formed in a spiral shape, a spiral shape, or at equal intervals in the circumferential direction, into which a cooling medium can flow, and the heating means is arranged on the center axis of the cavity of the entry piece, or the heating means is arranged on the cavity center axis of the entry piece or In the bush, heaters are arranged in a spiral shape, a spiral shape, or at equal intervals in the circumferential direction in a concentric circle with the side surface of the cavity with the center axis of the cavity as the center, and the bush is interposed,
In the case where the bush is not interposed between the bush and the formwork, a heat insulating layer concentric with the side surface of the cavity is provided between the insert piece and the formwork.

[Embodiments of the Invention] Before entering into the description of the embodiments, the basic matters related to the present invention will be explained using FIGS. 3 and 4 again.

In the conventional injection compression molding mold 7 shown in FIG. Alternatively, the distance l' between the cooling hole 3) and point C (or point C') of the cavity side surface 8 is different from each other. The distance l' between the cooling hole 2 and the point C of the cavity side surface 8 is the distance between the cooling hole 2 and the cavity side surface 8.
is larger than the distance l between points B in . Therefore, when cooling the injection compression molding mold 7 by passing a cooling medium through the cooling holes 2 and 3 to cool the resin in the cavity 1, the resin near point C is more sensitive to the cooling holes 2 and 3 than the resin near point B. Cooling is delayed due to the long distance to 3.
Therefore, the resin near point C is cooled at a more or less high temperature than the resin near point B. Therefore, even when the resin cools and solidifies, the temperature of the resin near point C is higher than that of the resin near point B, and the molding shrinkage increases accordingly.
It is thought that a plastic lens having a lens surface shape with poor axial symmetry as shown in the figure is molded.

As described above, the left and right sides of the mold have the same symmetrical configuration, and the same runner gate 6 and cavity 1 on the right side are provided on the left side of the figure. Therefore, when filling a mold with resin and performing injection compression molding, the heat radiated from the resin from the runner gate and cavity on the left (not shown) is transferred to the cavity 1 on the right.
The left side (point C' side) of the cavity side surface 8 becomes hotter than the right side (point C side). This is considered to be the reason why the axial symmetry of the lens surface shape is even worse in the case of multiple molding than in the case of single molding.

Therefore, in the present invention, cooling holes are arranged concentrically with the cavity side surface 8 so that the distances from all points on the cavity side surface 8 of the cavity 1 to the cooling holes are the same, so that The distances from the resin parts located at the same distance from the cavity center axis to the cooling holes are all made the same. Furthermore, a heat insulating layer concentric with the cavity side surface 8 is provided around the cavity 1 to prevent resin heat radiation from the runner and other cavities from being conducted to the cavity 1. By configuring each cavity in this way, the resin temperature distribution in all directions of the cross section of the cavity 1 (all cross sections passing through the cavity center axis) becomes axially symmetrical during the cooling process.
Therefore, the amount of molding shrinkage of all cross sections of the cavity 1 can be made the same in an axially symmetrical manner.

In injection compression molding, in the mold preheating step A, the mold temperature is preheated to the resin flow temperature range prior to the start of injection, and in the next injection step B, the mold temperature is adjusted to the above range. Fill the resin into the cavity while maintaining the flow temperature range. Once the resin is filled into the cavity, pressurization of the resin is started. In the first primary cooling step C, the resin is once rapidly cooled from the flow temperature range to below the heat distortion temperature. After that, in the mold reheating step 2, the mold is heated again to a constant temperature within the heat distortion temperature or the heat distortion temperature + 40°C. After that, while maintaining the resin in Cavity 1 in a state where it can be shaped by compression, the temperature of the resin in Cavity 1 is equalized to minimize molding shrinkage caused by subsequent cooling and to make it uniform in each part of the plastic lens. In the constant temperature process E, the mold temperature is maintained at a constant temperature of the heat distortion temperature or the heat distortion temperature + 40°C so that the mold temperature can be maintained at a constant temperature of 40°C. In this way, the reason why the resin temperature is rapidly cooled to below the heat distortion temperature of the mold in the primary cooling process C before the constant temperature process E is that the resin temperature when filled into the cavity 1 in the injection process B is 230°C. Since the temperature is ~260℃, cavity 1
This is to enable the internal resin temperature to shift to the heat distortion temperature or a constant temperature within the heat distortion temperature +40°C in a short time. That is, by once rapidly cooling the mold temperature to below the thermal deformation temperature in the primary cooling step C, the time of the constant temperature step E can be shortened. In the next slow cooling step, the resin is cooled to a heat distortion temperature of about −20° C., and the pressurization of the resin is finished here. In the next secondary cooling process, the resin (that is, the molded product) is cooled until it can be taken out of the mold, and in the mold release process,
The molded product is taken out of the mold, and one molding cycle is completed.

In this way, by performing injection compression molding using the injection compression molding mold configured as described above,
Even when a plurality of plastic lenses with large lens diameters are molded, a plastic lens with excellent axial symmetry of the lens surface shape and excellent lens surface precision can be obtained.

Examples will be described below with reference to the drawings.

FIG. 1 is a partially sectional front view showing an injection compression mold for two-cavity molding according to an embodiment of the present invention;
FIG. 2 is a mold temperature pattern diagram during a molding process using the injection compression molding mold according to FIG. 1. FIG.

This injection compression mold is used to mold two concave lenses, and as shown in FIG. 1, a fixed mold insert piece 12 is slidably provided in a fixed mold frame 11. A fixed mold 37 and a movable mold 38, in which a movable mold insert piece 18 is slidably provided in a movable mold frame 15 via a movable bush 19, are provided facing each other. A cavity 1 is formed between the fixed mold insert piece 12 and the movable mold insert piece 18 and is filled with resin to form a concave lens, and a cavity 1 is provided to press the movable mold insert piece 18. It has a hydraulic cylinder 20 that generates pressure. In addition, cooling means for cooling the fixed mold 37 and the movable mold 38 include a cooling hole 25 bored in the fixed mold insert piece 12 on the cavity central axis 1a, and a cooling hole 25 formed on the cavity side surface around the cavity central axis 1a. A cooling hole 27 formed in a spiral shape concentric with 8 is arranged, and a cooling hole 26 formed on the cavity center axis 1a is arranged in the movable insert piece 18, and furthermore, in the movable bush 19, Cooling holes 28 are arranged in a spiral shape concentrically with the cavity side surface 8 with the cavity center axis 1a as the center, and a cooling medium can flow into each of the cooling holes 25 to 28. ing. The reason for arranging the cooling holes 25 to 28 in this way is to make the mold temperature distribution axially symmetrical during mold cooling during the molding process, and to make the resin temperature distribution in all cross sections in the cavity 1 axially symmetrical and the same. This is to make it more effective.

On the other hand, the heating means includes a fixed type insert piece 12, a movable type insert piece 18, a movable type bush 19, a band heater 29 related to a heating heater in a spiral shape concentric with the cavity side surface 8, centered on the cavity center axis 1a, 30 and 31 are provided, respectively. The reason for arranging the band heaters 29, 30, and 31 in this way is that the cavity 1
This is to make the temperatures of the fixed type insert piece 12, the movable type insert piece 18, and the movable type bush 19 that constitute the axially symmetrical.

32 is a heat insulating layer provided between the fixed mold insert piece 12 and the fixed formwork 11 and is concentric with the cavity side surface 8; 33 is the movable bushing 19 and the movable formwork 15;
34 is a heat insulating layer provided between the fixed type insert piece 12 and the fixed type mounting plate 14, and 35 is a heat insulating layer provided between the movable type insert piece 18 and the fixed type mounting plate 14. This is a heat insulating layer provided between the hydraulic cylinder 20 and each of the heat insulating layers 32 to 35 is made of stainless steel (its thermal conductivity is approximately 1/4 that of carbon steel, which is a normal mold material). ).

13 is a spool bushing, and a spool 22 is bored inside this spool bushing 13. Furthermore, a runner 23 and a gate 24 are provided in the movable mold frame 15 and the movable bush 19, respectively, to form a flow path for guiding the resin injected from the injection molding machine into the cavity 1. are doing. The cross-sectional area of the runner 23 and gate 24 is made small, and the gate 24 is made elongated so as not to disturb the axial symmetry of the resin temperature distribution.

Thermocouples (not shown) for detecting temperature are embedded in the fixed insert piece 12, the movable insert piece 18, and the movable bush 19, respectively. 16 is a movable mold plate attached to the movable mold frame 15, and 36 is an extrusion pin provided at the center of the movable mold plate 16 and the movable mold frame 15.

The fixed mold 37 is attached to the fixed mold mounting plate 1.
4 to the fixed platen of the injection molding machine, and constitutes the fixed side of the injection compression mold. On the other hand, the movable mold 38, the spacer 17, the hydraulic cylinder 2
0 is attached to the movable platen of the injection molding machine via the movable die mounting plate 21, and constitutes the movable side of the injection compression mold. The left half of Figure 1 has the same configuration as the right half explained above, and has two
It can be molded individually.

The role of the heat insulating layers 32 to 35 described above is to reduce heat leakage from the fixed mold insert piece 12, the movable mold insert piece 18, and the movable bush 19, reduce the effective heat capacity of the injection compression mold, and reduce the effective heat capacity of the injection compression mold. The temperature can be changed in a short time to shorten the molding cycle, and at the same time, the resin heat released from the spool 22, runner 23, and left side cavity (not shown) is prevented from being conducted to the cavity 1, and the above-mentioned cooling Working together with the holes 25 to 28 and the band heaters 29, 30, and 31, the temperatures of the fixed insert piece 12, the movable insert piece 18, and the movable bush 19 that make up the cavity 1 are axially symmetrically uniform with extremely high precision. It is something that makes you change your mind. This also applies to the cavity on the left side of the mold.

With the injection compression mold configured in this way,
The operation of forming a concave lens will be explained using FIGS. 1 and 2.

When the mold is closed and the injection molding machine is turned on,
The band heaters 29, 30, and 31 are energized to heat the fixed mold 37 and the movable mold 38 [mold preheating step A in FIG. 2]. Due to the thermocouple, cavity 1
It is detected that the temperature of the fixed mold insert piece 12, movable mold insert piece 18, and movable bush 19 that make up the mold (hereinafter referred to as mold temperature) has reached the flow temperature range of the resin (175°C or higher for PC resin). Then, the molten resin is injected from the injection molding machine and filled into the cavity 1 via the spool 22, runner 23, and gate 24 [injection process B in FIG. 2]. During this time, the band heaters 29, 30, and 31 are turned ON and OFF to maintain a constant temperature within the above-mentioned flow temperature range, and the weld line that occurs when the molten resin flows inside the cavity 1 (in the case of a concave lens that is thin at the center and thick at the periphery) This weld line can be removed by heat-sealing. When the filling of the resin into the cavity 1 is completed, the hydraulic cylinder 20 is turned on, and the resin in the cavity 1 is pressed with a predetermined pressure via the movable entry piece 18, and the cooling holes 26, 27, 28 are pressed.
A cooling medium flows through the resin, and the mold temperature is once rapidly cooled down to below the thermal deformation temperature of the resin [primary cooling step c in FIG. 2]. Subsequently, the mold is heated to a constant temperature within the heat deformation temperature or the heat deformation temperature + 40° C. [mold reheating step 2 in FIG. 2],
While the mold temperature is maintained for a predetermined period of time, the pressure by the hydraulic cylinder 20 is continued [constant temperature step H in Fig. 2], and then the mold temperature is lowered by -20
Cooled to ℃. As a result, the resin temperature distribution inside the cavity 1 becomes axially symmetrical, and the resin temperature distribution inside the cavity 1 becomes axially symmetrical.
The amount of molding shrinkage of all cross sections of the molding is axially symmetrically the same, achieving extremely similar shrinkage to the cavity 1, which is manufactured with high precision on the order of microns, and molding with a high degree of shape accuracy is achieved. [See the slow cooling process in Figure 2]. And hydraulic cylinder 2
0 turns OFF, pressurization ends, band heaters 29, 30, 31 turn OFF, and cavity 1
The molded product molded inside the mold is cooled until it can be taken out of the mold (secondary cooling step 1 in FIG. 2).
The flow of the cooling medium is stopped, the mold is opened, the movable mold insert piece 18 is pushed up by the hydraulic cylinder 20, and the desired concave lens is taken out from the cavity 1 [mold release step (4) in FIG. )〕. The above also applies to the cavity on the left side of the mold. In this way, highly accurate two-cavity molding of the plastic lens becomes possible.

A specific example will be explained.

Diameter 47mm, minimum thickness 3.5mm, maximum thickness 12.7mm,
Concave lenses made of PC resin with curvature radii of 250mm and 30mm,
When molding was performed using the injection compression mold shown in Figure 1, deviations from the axial symmetry of the lens surface shape were detected.
Two-cavity molding with a lens surface accuracy of 0.3μm and 0.9μm was achieved.

In addition, using the injection compression mold shown in Figure 1 (however, the cavity is shaped like a cavity for molding a convex lens), a diameter of 43 mm and a minimum thickness of
1.0mm, maximum thickness 14.5mm, radius of curvature 87mm and 30mm
When a convex lens made of PMMA resin was molded, a two-cavity molding was achieved with a lens surface shape deviation from axial symmetry of 0.3 μm and a lens surface accuracy of 0.6 μm. In the case of convex lens molding, unlike in the case of concave lenses, the weld line does not occur, so the mold temperature in the mold preheating process (a) and the injection process (b) may be below the thermal deformation temperature of the resin. Other than this point, the convex lens molding process may be performed by heating and cooling in accordance with the mold temperature pattern similar to the above-described concave lens molding process.

According to the embodiment described above, the resin temperature distribution within the cavity 1 becomes axially symmetrical, and the resin temperature distribution within the cavity 1 becomes axially symmetrical.
The amount of molding shrinkage of all cross sections of the lens is axially symmetrically the same, achieving similar shrinkage that is extremely faithful to cavity 1. Even when the lens diameter is large, the axial symmetry of the lens surface shape is excellent and the lens surface shape is This has the advantage that a plurality of plastic lenses (concave lenses and convex lenses) with excellent precision can be molded.

In addition, in this embodiment, the fixed mold 37 also includes:
Although the movable type 38 is also provided with insert pieces (fixed type insert piece 12, movable type insert piece 18), the fixed type does not need to be provided with an insert piece. However, if the injection compression mold is large and has a large cavity (that is, if the heat capacity is large), it is generally better to provide an entry piece.

Furthermore, in this embodiment, the cooling holes 25 to 2
However, if the cavity is small (that is, the lens diameter is small) or if the cooling hole diameter is large, the cooling holes 25 and 26 on the cavity center axis 1a or the spiral cooling Only one of the holes 27 and 28 may be provided. In addition to the shape described in the above embodiment, the shape of the cooling hole is centered around the cavity center axis.
The holes may be formed in a spiral shape or may be formed at equal intervals in the circumferential direction.

Furthermore, in this embodiment, the heat insulating layer 32
~35 is made of stainless steel, but the material of these insulation layers is not limited to stainless steel.
A ceramic composite material, a thermoplastic resin laminate, a composite material of asbestos and cement, etc. may be used, and the space itself may be used as a heat insulating layer.

Next, other embodiments of the present invention will be described.

In the above embodiment, band heaters 29 to 31 were used as the heating means, but the heaters are not limited to this type. Heating holes may be formed in the bush 19 in a spiral or spiral shape concentric with the cavity side surface 8 around the cavity center axis 1a, or at equal intervals in the circumferential direction, into which a heating medium can flow. Further, this heating hole may be used in common with the cooling hole, and a cooling medium and a heating medium may be appropriately flowed into the hole. Although two-cavity molding has been described in each of the above embodiments, the present invention is not limited to this.
It can be applied to both multi-cavity molding of three or more molds and single-cavity molding.

Furthermore, although each of the above embodiments describes lens molding, the injection compression molding mold of the present invention can also be applied to molding axially symmetrical parts such as disks, gears, and rollers with high precision. Needless to say.

〔Effect of the invention〕

As explained in detail above, according to the present invention,
We provide an injection compression molding mold that can efficiently mold plastic lenses with excellent axial symmetry and lens surface precision even when molding multiple lenses with large lens diameters. can do.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view showing an injection compression mold for two-cavity molding according to an embodiment of the present invention;
FIG. 2 is a mold temperature pattern diagram during a molding process using the injection compression molding mold shown in FIG. 1, and FIG. 3 is a partial cross-sectional schematic diagram showing a conventional injection compression molding mold for two-cavity molding. , FIG. 4 is a schematic cross-sectional view of a main part showing the lens surface shape of a concave lens molded by the injection compression mold according to FIG. 3. 1... Cavity, 1a... Cavity center axis, 8... Cavity side surface, 11... Fixed formwork,
12... Fixed type input piece, 15... Movable formwork, 18...
...Movable entry piece, 19...Movable button, 20...
... Hydraulic cylinder, 25, 26, 27, 28 ... Cooling hole, 29, 30, 31 ... Band heater, 3
2, 33...Insulating layer, 37...Fixed type, 38...
Movable type.

Claims (1)

[Scope of Claims] 1. A fixed type and a movable type, which are arranged opposite to each other and have a sliding piece in at least one of the formworks via a bushing or directly;
a cavity formed between the filling piece and the opposing mold or filling piece, into which resin can be filled; a hydraulic cylinder that generates a pressing force for pressing the filling piece; In an injection compression molding mold having means capable of heating and cooling a fixed mold and a movable mold, the cooling means is provided on the center axis of the cavity of the input piece, or on the cavity center axis of the input piece or the bush. Cooling holes are formed in a spiral or spiral shape or at equal intervals in the circumferential direction, concentric with the side surface of the cavity, with the shaft as the center, into which a cooling medium can flow, and the heating means is located at the center of the cavity of the entry piece. Holes are formed on the shaft, or are formed in the input piece or bush in a spiral or spiral shape concentric with the side surface of the cavity, or at equal intervals in the circumferential direction, centering on the cavity center axis, into which the heating medium flows. In the case where the bushing is interposed, there is a heating hole between the bushing and the formwork, and in the case where the bushing is not interposed, there is a heating hole between the insert piece and the formwork, which is concentric with the side surface of the cavity. An injection compression molding mold characterized by providing a heat insulating layer. 2. The injection compression mold according to claim 1, characterized in that the cooling hole and the heating hole are shared. 3. A fixed type and a movable type, which are arranged opposite to each other and have a sliding piece in at least one of the formworks via a bushing or directly;
a cavity formed between the filling piece and the opposing mold or filling piece, into which resin can be filled; a hydraulic cylinder that generates a pressing force for pressing the filling piece; In an injection compression molding mold having means capable of heating and cooling a fixed mold and a movable mold, the cooling means is provided on the center axis of the cavity of the input piece, or on the cavity center axis of the input piece or the bush. Cooling holes are formed in a spiral or spiral shape or at equal intervals in the circumferential direction, concentric with the side surface of the cavity, with the shaft as the center, into which a cooling medium can flow, and the heating means is located at the center of the cavity of the entry piece. The heaters are bored on the shaft or arranged in the insert piece or bush in a spiral shape, a spiral shape concentric with the side surface of the cavity, or at equal intervals in the circumferential direction with the cavity center axis as the center; In the case where a bushing is interposed, a heat insulating layer is provided between the bushing and the formwork, and in the case where the bushing is not interposed, a heat insulating layer is provided between the insert piece and the formwork, concentric with the side surface of the cavity. Injection compression mold.