JPH0692103B2 - Molding equipment - Google Patents

Description

The present invention relates to a molding apparatus such as an in-line screw type injection molding apparatus or an extrusion molding apparatus,
In particular, the present invention relates to a molding apparatus capable of observing the internal state of the heating cylinder.

[Prior Art] In an in-line screw-type injection molding device, kneading / plasticizing and measuring of resin is performed by rotating and retracting the screw which is rotatably arranged in a heating cylinder, and then the screw is moved forward. As a result, the molding process of filling the molten resin into the cavity of the mold device is performed.

That is, in a screw-type injection molding apparatus such as this type of in-line type, as is well known, the resin material supplied from the hopper into the heating cylinder is kneaded by the rotation of the screw inside the heating cylinder while being screwed. It is sent to the tip of the heating cylinder along the groove. And
The resin material is heated and plasticized and melted by the heat transmitted from the heating cylinder heated by a band heater or the like and the frictional heat generated between the resin materials by the kneading action of the screw and between the resin material and the metal surface. It is becoming like this.

Therefore, in order to obtain high-quality molded products, it is necessary to achieve and control uniform and good plasticizing and melting of the resin material.For this reason, the screw design that greatly contributes to the kneading and plasticizing mechanism of the resin Optimal design is one of the important points.

By the way, strict analysis of the plasticization mechanism of the resin due to the external heating and the screw rotation as described above has been extremely difficult, and therefore, conventionally, when constructing various injection molding apparatuses,
The device design including the above-mentioned screen design is usually made based on the geometrical similarity and empirical values from the case studies.

[Problems to be solved by the invention] However, in the plastics industry in recent years, the types of plastics materials are diverse, the blending of materials is sophisticated, and the molding conditions are diversifying, so that the quality and accuracy of molded products are required. Is even higher. Under these circumstances,
When attempting to design a higher quality and high cycle injection molding apparatus, it is no longer possible to deal with the conventional experience values and trial and error methods.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a molding apparatus that can theoretically analyze, for example, the flow behavior of molten resin in a heating cylinder.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention uses a heating cylinder, and in a molding apparatus in which a screw is rotatably arranged in the heating cylinder, the heating cylinder is provided on the peripheral wall of the heating cylinder. A slit-shaped observing portion for observing the inside which extends in the axial direction is provided, and a transparent tempered glass body disposed in the observing portion is formed by vertically dividing the heating cylinder into two parts along the axial direction. The heating cylinder is sandwiched by the divided peripheral wall bodies.

In order to achieve the above-mentioned object, the present invention uses a heating cylinder, and in a molding apparatus in which the screw is rotatably arranged in the heating cylinder, an internal observation extending in the axial direction of the heating cylinder is performed on the peripheral wall of the heating cylinder. And a slit-shaped observing part for use, and the heating cylinder is configured by axially coupling a plurality of short cylinder element bodies, and the observing section is provided on at least one of the cylinder element bodies. And

[Operation] By providing the slit-shaped observing portion extending in the axial direction on the peripheral wall of the heating cylinder in this way, for example, the flow behavior of the resin due to the rotation of the screw, the kneading state of the resins, and the check ring during injection. Behavior or the temperature distribution in the heating cylinder can be directly observed and measured. With such observation and measurement data,
Not only will it be easier to design new screws, but it will also be possible to clarify various failure phenomena.

Further, when the heating cylinder is vertically divided into two along the axial direction, it is easy to form a slit-shaped observation portion for internal observation that extends in the axial direction and is excellent in manufacturability. Become. Further, since the heating cylinder is vertically divided into two along the axial direction, the observation portion can be easily formed over the entire length of the heating cylinder. Therefore, the resin behavior can be observed over the entire length of the heating cylinder.

Further, a heating cylinder is configured by axially coupling a plurality of short cylinder element bodies, and at least one of the cylinder element bodies is provided with an axially extending slit-shaped observation portion for internal observation. In this case, as compared with the case where the slit-shaped observation portion is provided on the long heating cylinder, the slit-shaped observation portion can be formed easily and the manufacturability is excellent. Furthermore, by making the observation part shorter than the entire length of the cylindrical cylinder element body, the length of the glass body of the observation part becomes relatively short, the damage of the glass body due to temperature fluctuation is reduced, and the cylinder Even if a force for crimping the connecting portions of the respective cylindrical element bodies is applied, the glass body is not likely to be damaged, so that it is possible to obtain a structure having a high sealing effect without resin leakage.

[Examples] The present invention will be described below with reference to Examples shown in the drawings. 1 to 6 relate to one embodiment of the present invention, FIG. 1 is a side view of an injection molding apparatus, and FIG. 2 is a partially cut side view showing a heating cylinder, a screw and the like used in the injection molding apparatus. Figures and 3 are cross-sectional views of the heating cylinder cut in a direction orthogonal to the axial direction, FIG. 4 is a side view of the heating cylinder with a partial cross section showing the arrangement state of glass bodies, and FIG. 5 is glass. FIG. 6 is an exploded perspective view showing the body, the spacer and the wedge, and FIG. 6 is a block diagram of the image processing apparatus.

First, the schematic configuration of the injection molding apparatus will be described with reference to FIG.

In the figure, 1 is a base, 2 is an injection part mounted on the base 1, and has a heating cylinder 3, a screw 4, a nozzle 5, a cover 6, and the like. Reference numeral 7 is a hopper connected to the ejection unit 2, 8 is a drive unit provided behind the ejection unit 2,
In addition to having a gear group (not shown), a screw rotation motor 9 and an injection motor 10 are provided.

The pellet-shaped molding material charged from the hopper 7 is kneaded and plasticized in the heating cylinder 3 by the rotation of the screw 4, and is automatically metered by the backward movement of the screw 4. After that, the screw 4 is advanced by a predetermined stroke by the driving of the injection motor 10, and the molten resin is injected and filled from the nozzle 5 into the cavity (not shown).

Next, the structure near the heating cylinder 3 will be described in detail with reference to FIGS.

As shown in FIG. 3, in this embodiment, the heating cylinder 3 is vertically divided into two along the axial direction thereof, and is composed of an arc-shaped upper divided peripheral wall body 3a and a lower divided peripheral wall body 3b. , By combining the divided peripheral wall bodies 3a, 3b,
A hollow portion is formed to accommodate the. Also, both divided peripheral walls 3
At substantially central positions of the side end surfaces of a and 3b, receiving portions 11a and 11b whose outer peripheral sides are further raised are provided so as to face each other.
The receiving portions 11a and 11b are continuously formed over substantially the entire length of the divided peripheral wall bodies 3a and 3b.

Between the receiving portions 11a, 11b, a plurality of transparent heat-resistant rectangular columnar, or columnar high-purity quartz glass with a surface facing the inner side of the cylinder into an arcuate concave surface along the inner surface of the cylinder.
Glass bodies 13a, 13b, 13c of high-strength transparent glass are arranged in a row with spacers 14 made of metal, respectively. Further, on one end side of the glass body 13 rows, a pair of metal wedges 15a,
15b is arranged as shown in FIGS.

Further, as shown in the figure, a sealing tape 16 made of unsintered polytetrafluoroethylene tape is wound around the upper surface, both side surfaces and the lower surface of each glass body 13, spacer 14 and wedge 15. The sealing material is not limited to this, and other sealing material such as heat-resistant rubber mixed with asbestos may be used.

As shown in FIG. 3, the glass bodies 13, the spacers 14, the wedges 15 and the like abut on the receiving portions 11a and 11b and are arranged in a line. At this time, the glass body 13, the spacer 14 and the wedge 15
Each inner surface of is designed so as not to project from the inner peripheral surface of the heating cylinder 3. Then, the bolts 12 arranged at a predetermined interval in the axial direction of the heating cylinder 3 are tightened in the vertical direction while adjusting the torque so as to obtain a predetermined surface pressure. Thus tightened, a slit-shaped observation window 17 is formed along the axial direction of the heating cylinder 3 along substantially the entire length thereof.

On the other hand, as shown in FIG. 4, a holding screw 18 is screwed on one side of the heating cylinder 3 (on the side opposite to the injection side) that faces the upper surface of the wide area of the wedge 15b. Further, a spacer receiving portion 19 is provided at a position facing the spacer 14 at the front end on the other end side (injection side) of the heating cylinder. Therefore, by pushing the holding screw 18 into the wedge 15b, the glass bodies 1 are operated by the action of the wedges 15a and 15b.
3 and the spacer 14 are strongly pressed toward the spacer receiving portion 19 side. Then, by the tightening with the bolt 12, the pressing with the pressing screw 18, and the metal O-ring 32, the seals around the divided peripheral wall bodies 3a and 3b, the glass body 13 and the like are securely held, and the heating cylinder 3 Resin leakage from the can be effectively prevented.

In FIG. 2, 21 is a resin pressure sensor such as a load cell, 22 is a resin temperature sensor such as an infrared radiation thermometer, and as shown in FIG. Near zone), compression zone (intermediate zone), and metering zone (nozzle 5)
The resin pressure and the resin temperature in the zone (close to the zone) are detected with a predetermined sampling period. Further, 23 is a band heater, and the band heater 23 is wound around the outer periphery of the heating cylinder 3 except for the observation window 17 so as not to cover the observation window 17. The band heater 23 is also wound around the nozzle 5.

FIG. 6 is a block diagram of an image processing apparatus for photographing, recording or analyzing the behavior of the resin in each zone (supply zone, compression zone, measuring zone) in the heating cylinder 3 through the observation window 17. . In the figure, 24 is the observation window 17
A video camera main body, a video camera main body 25, a strobe controller 26, and a stroboscopic light emission unit 27 directed to the observation window 17, which constitute a photographing unit. Reference numeral 28 is a video deck, and 29 is a monitor, and a recording unit is configured from these, and a synchronization signal is output from the camera body 25 to the strobe controller 26 and the video deck 28. Reference numeral 30 is a control unit composed of a micro computer, 31 is a printer, and an image processing unit is composed of these.

The resin material (resin pellet) charged from the hopper 7 is heated by heat transfer from the heating cylinder 3 and frictional heat generated between the resin material and the resin material-metal surface due to the kneading action of the screw. The melting of the resin material is started from the portion in contact with the inner surface of the cylinder 3. The molten resin forms a thin molten layer between the inner surface of the heating cylinder 3 and the unmelted pellet layer (solid bed) formed inside the heating cylinder 3. When the thickness of this layer develops beyond the flight clearance, it is scraped off by the flight of the scrilles 4 and collected at the rear of the scrilles groove to form a melt pool. This melt is circulated in the pool,
As the solid bed is kneaded with the previous melt, the above-mentioned solid bed is gradually reduced, and eventually the entire screw groove is filled with the melt.

The behavior of the resin in the heating cylinder 3 is photographed by the above-mentioned video camera, the image signal is input to the video deck, and the desired image processing is performed by the control unit 30. Sensor 21 and resin temperature sensor 22
The resin behavior is obtained as a large number of inhibition images by adding the data from.

7 to 13 relate to another embodiment of the present invention. FIG. 7 is a partially cutaway side view showing a heating cylinder and its peripheral portion, FIG. 8 is a side view of a cylinder element body, and FIG. 8 is a sectional view taken along the line AA in FIG. 8, FIG. 10 is a sectional side view of the cylinder element body, and FIG. 11 is a sectional view of the cylinder element body cut in a direction orthogonal to its axial direction to show the mounting structure of the glass body. FIG. 12 is a cross-sectional view of a main part cut along the axial direction of the cylinder element body to show the mounting structure of the glass body.
FIG. 13 is a side view of an essential part of a portion corresponding to FIG. In FIG. 7, members corresponding to those in the above-mentioned embodiment are designated by the same reference numerals, and the description thereof will be omitted to avoid duplication.

In FIG. 7, reference numeral 33 denotes a heating cylinder, and in this embodiment, the heating cylinder is constituted by connecting five cylinder element bodies 33a to 33e in the axial direction. That is, the cylinder element bodies 33a to 33e are connected by aligning and fitting the concavo-convex portions formed on the end faces of the cylinder element bodies 33a to 33e, as will be described later, and at the base side (the side opposite to the ejection side). The cylinder element body 33e is fixed and held to the headstock 34 (the member to which the hopper 7 is attached in FIG. 1). In addition, this cylinder element body on the base side
The opening 33e communicates with the opening 35 of the headstock 34 to receive the resin material supplied from a hopper (not shown).
36 are provided.

Reference numeral 37 denotes a mounting plate for fixing the cylinder element body 33e to the head stock 34, which is screwed and fixed to the head stock 34 with a screw 38. 39 is a tie rod whose one end is screwed to a mounting plate 37, and 40 is the cylinder element body 33 on the injection side.
By attaching the other end of the tie rod 39 to the attachment plate 40 with the nut 41 with the attachment plate abutting the end face of a, the cylinder element bodies 33a to 33e are integrally connected and held. There is. In the example, the tie rod 39
Are installed at equal intervals.

In this embodiment, among the cylinder element bodies 33a to 33e, four cylinder element bodies 33a to 33d excluding the cylinder element body 33e on the root side are provided with slit-shaped observation windows for internal observation along the axial direction thereof. 42 are formed respectively, and in each observation window 42, a transparent glass body 43 of heat-resistant and high-strength glass made of high-purity quartz glass is arranged. It should be noted that which cylinder element body is provided with the observation window 42 is an arbitrary matter determined by which part of the heating cylinder 33 is required to observe the resin behavior. It may be arbitrarily divided into one cylinder element body or the length of each cylinder element body, but the length of the cylinder element body should be determined in consideration of workability of hole machining described later.

In this embodiment, among the four cylinder element bodies 33a to 33d in which the observation window 42 is formed, the cylinder element bodies 33b to 33d other than the cylinder element body 33a having the threaded portion of the nozzle 5 are excluded.
Have almost the same shape, and this cylinder element body 33b
Structures 33d to 33d will be described below by taking the cylinder element body 33b shown in FIGS. 8 to 10 as a representative.

In each of the drawings, reference numeral 44 denotes a circular center hole that axially penetrates through the central portion of the cylinder element body 33b, and the screw 4 is positioned in the center hole 44. Reference numeral 45 denotes a glass storage hole having a substantially rectangular cross section that communicates with the center hole 44, and is a cylinder element body 33b.
The glass body 43 is mounted in the glass housing hole 45 as will be described later. The glass housing hole 45 is formed by wire electric discharge machining, and its surface is finished as an extremely smooth flat surface. Reference numeral 42 is the observation window described above, which is formed in a slit shape along the axial direction so as to reach the glass storage hole 45 from the outer peripheral surface of the cylinder element body 33b. This observation window 42 is set shorter than the entire length of the cylinder element body 33b,
For example, it is formed by end milling.

46 is a convex portion provided at one end of the cylinder element body 33b, and 47 is a concave portion provided at the other end of the cylinder element body 33b.
A small hole 48 is formed in each of the recesses 47. Then, by inserting a pin (not shown) into the small hole 48, the concave portion 47 of the cylinder element body 33b is fitted into a convex portion (not shown) of the cylinder element body 33a, and the pin described above is inserted into the cylinder element body.
Insert it into the small hole of the convex part of 33a, and
Are aligned and connected in the axial direction. In addition, the convex portion 46 of the cylinder element body 33b is connected to the cylinder element body 3
3c is fitted into a recess (not shown), and the above-mentioned pin is fitted into a small hole of the recess of the cylinder element body 33c so that both cylinder element bodies 33b, 33c are aligned and connected in the axial direction. . All of the cylinder element bodies 33a to 33e described above are connected in the axial direction by the positioning by such pins and the fitting of the concavo-convex portions, and the fastening by the tie rod 39 described above. Combined with the force, the split heating cylinder structure is used, but it has a structure with extremely high sealing effect without resin leakage.

8 to 10, 49 is a cylinder element body 33.
A plurality of screw holes hanging down from the outer peripheral surface of b so as to reach the glass storage hole 45, 50 are formed in a direction orthogonal to the screw hole 49 located on the extension line of the observation window 42. A through hole is formed, 51 is a threaded sensor housing hole for housing the resin pressure sensor 21, and 52 is a threaded sensor housing hole for housing the resin temperature sensor 22. (In FIG. 7, screw holes 49 are drawn only in the cylinder element body 33d for the sake of illustration, but screw holes 49 are similarly formed in the other cylinder element bodies 33a to 33c having the observation window 42. Next, the structure for attaching the glass body 43 to the cylinder element bodies 33a to 33d will be described with reference to FIGS. 11 to 13. Also in this case, since the mounting structure of each glass body 43 to each cylinder element body 33a to 33d is almost the same, the cylinder element body 33b will be described as a representative.

The columnar glass body 43 is shorter than the length of the cylinder element body 33b, and is inserted into the glass housing hole 45. Of course, it goes without saying that the glass body 43 is shaped so as not to project into the central hole 44. The pressing plate 53 is slightly longer than the glass body 43, and is placed on the upper surface of the glass body 43 as shown in FIG. Then, the glass body 43 is reliably positioned in the vertical direction by pressing the glass body 43 downward in the drawing via the pressing plate 53 with the screw 54 screwed into the screw hole 49. Since the glass body 43 is pressed through the pressing plate 53 in this way,
A uniform pressing force acts on the glass body 43, and an unreasonable shearing force does not work, so that damage to the glass body 43 is prevented as much as possible.

Further, on one end side in the longitudinal direction of the glass body 43, a wedge 55 and a wedge 56 are arranged as shown in FIG. 12, and a screw 57 inserted from the through hole 50 is attached to the one wedge 56. It is screwed. Accordingly, by moving the wedge 56 downward in FIG. 12 with the screw 57, a rightward pressing force acts on the glass body 43 in FIG. 12, and the cylinder element bodies 33a to 33e are assembled as described above. Then, the other end of the glass body 43 is brought into contact with the end surface of the adjacent cylinder element body to be positioned.

Thus, in the embodiment, each cylinder element body 33a
Together with the fact that the pressing force in the longitudinal direction on each glass body 43 incorporated in ~ 33d can be adjusted independently, and that the length of the glass body 43 is shorter than that of the above-mentioned embodiment, Glass body 43 due to the difference in elongation between the heating cylinder 33 and the glass body 43 due to a large temperature difference between before and during operation of the device
It is designed to prevent damage to the.

FIG. 14 shows a heating cylinder according to still another embodiment of the present invention.

In the figure, the heating cylinder generally indicated by reference numeral 60 is
For example, six cylinder element bodies 60a to 60f are connected in the axial direction, and only one of the cylinder element bodies 60e is provided with an observation window 61 corresponding to the observation window 42 of the above-described embodiment. There is. The cylinder element body 60e has substantially the same structure as the cylinder element bodies 33b, 33c, 33d in the embodiment shown in FIGS. 7 to 13 and has the same holding structure as that of the above embodiment although not shown. The structure contains a glass body. Further, the cylinder element bodies 60a to 60f are fitted to each other by the concavo-convex portions of the end faces thereof and are aligned by the pins, as in the above embodiment.

And in this embodiment, the cylinder element body on the injection side
Four cylinder element bodies 60b to 60e other than 60a and the cylinder element body 60f on the base side attached to the headstock
Is arranged so that the cylinder element body 60e is at the rightmost position in the figure in the state of FIG. 14 (a), and the cylinder element body 60e is in the state of FIG. 14 (b) to (e). It is schematically shown that they are sequentially positioned to the left side.

In the embodiment having such a configuration, a heating cylinder which requires observation of resin behavior and the like by preparing only one cylinder element body having a glass body and having an observation window.
Since the cylinder element body 60e may be selectively positioned at an arbitrary portion of 60, it is advantageous in manufacturing cost.

In each of the above-described embodiments, the case where the present invention is applied to the injection molding apparatus has been shown, but the present invention is not limited to this and can be applied to, for example, an extrusion molding apparatus.

[Effect of the Invention] As a method of observing the behavior of the resin in the heating cylinder, The entire cylinder corresponding to the heating cylinder is made of a transparent material such as acrylic resin or tempered glass, and instead of the resin material,
Using a mixture of starch syrup and PVC beads or a different material such as foam beads, and observing the internal condition through this cylinder. There is a method in which a plurality of spot-shaped through holes are formed in the peripheral wall of the heating cylinder and the internal state is spot-wise observed through the through holes.

In the former method, the whole process of resin flow can be observed, but different materials have to be used, and the difference between the actual heating cylinder and the transparent cylinder such as acrylic resin and tempered glass is different. Therefore, since various characteristics such as surface roughness and pressure resistance are different, even if image data or the like is obtained, it is not true to the actual injection molding apparatus.

In the latter method, the observation range in the heating cylinder is limited, so that the behavior state of the resin cannot be accurately grasped.

On the other hand, since the present invention is configured as described above, the behavior of the resin in the heating cylinder can be continuously observed throughout the process. Further, since the conditions are almost the same as those of the actual molding apparatus, there is an advantage that a theoretical analysis with truth can be performed, and it is useful for designing the molding apparatus such as a screw design.

Further, when the heating cylinder is vertically divided into two along the axial direction, it is easy to form a slit-shaped observation portion for internal observation that extends in the axial direction and is excellent in manufacturability. Become. Further, since the heating cylinder is vertically divided into two along the axial direction, the observation portion can be formed over the entire length of the heating cylinder. Therefore, the resin behavior can be easily observed over the entire length of the heating cylinder.

Further, a heating cylinder is configured by axially coupling a plurality of short cylinder element bodies, and at least one of the cylinder element bodies is provided with an axially extending slit-shaped observation portion for internal observation. In this case, as compared with the case where the slit-shaped observation portion is provided on the long heating cylinder, the slit-shaped observation portion can be formed easily and the manufacturability is excellent. Furthermore, by making the observation part shorter than the entire length of the cylindrical cylinder element body, the length of the glass body of the observation part becomes relatively short, the damage of the glass body due to temperature fluctuation is reduced, and the cylinder Even if a force for crimping the connecting portions of the respective cylindrical element bodies is applied, the glass body is not likely to be damaged, so that it is possible to obtain a structure having a high sealing effect without resin leakage.

Furthermore, in a heating cylinder having a divided structure composed of a plurality of cylinder element bodies, if an observation portion is formed in each cylinder element body, the inside can be observed in many portions in the longitudinal direction of the heating cylinder.

Further, in a heating cylinder having a divided structure composed of a plurality of cylinder element bodies, if only one cylinder element body with an observation section is prepared and positioned at a desired position, the resin behavior of the desired portion can be observed. , Which is advantageous in manufacturing cost.

Further, in a heating cylinder having a divided structure composed of a plurality of cylinder element bodies, if the glass body is pressed via a pressing plate along its longitudinal direction, a uniform pressing force acts on the glass body, which is impossible. The shearing force does not work, and damage to the glass body can be further prevented.

[Brief description of drawings]

1 to FIG. 6, according to one embodiment, FIG. 1 is a side view of an injection molding apparatus, FIG. 2 is a partially cut side view showing a heating cylinder, a screw and the like used in the injection molding apparatus, Three
The figure is a cross-sectional view of the heating cylinder cut in a direction orthogonal to the axial direction, FIG. 4 is a side view of the heating cylinder with a partial cross-section showing the arrangement state of glass bodies, and FIG. Fig. 6 is an exploded perspective view showing a wedge, Fig. 6 is a block diagram of an image processing apparatus, and Figs. 7 to 13 are related to another embodiment of the present invention. Fig. 7 is a part showing a heating cylinder and its peripheral portion. FIG. 8 is a sectional side view of the cylinder element body, FIG. 9 is a sectional view taken along the line AA of FIG. 8, FIG. 10 is a sectional side view of the cylinder element body, and FIG. FIG. 12 is a cross-sectional view of a main part of the cylinder element body cut in a direction orthogonal to its axial direction to show the mounting structure, and FIG. 12 shows a cylinder element body cut in the direction along its axial direction to show the mounting structure of the glass body. Sectional view, Figure 13 is a side view of the main part of the location corresponding to Figure 12, and Figure 14 is the main It is further an explanatory view showing a heating cylinder according to another embodiment of. 3 ... Heating cylinder, 3a ... Upper divided peripheral wall, 3b ... Lower divided peripheral wall, 4 ... Screw, 5 ... Nozzle, 7 ...
Hopper, 11a, 11b …… Reception part for glass body, 12 ……
Bolt, 13 (13a to 13c) …… glass body, 14 …… spacer, 15 (15a, 15b) …… wedge, 16 …… seal tape, 1
7 ... Observation window, 18 ... Press screw, 21 ... Resin pressure sensor, 2
2 ... Resin temperature sensor, 23 ... Band heater, 33 ... Heating cylinder, 33a to 33e ... Cylinder element body, 34 ... Headstock, 37, 40 ... Mounting plate, 39 ... Ti rod, 4
2 …… Observation window, 43 …… Glass body, 44 …… Center hole, 45 ……
Glass storage hole, 46 ... Convex part, 47 ... Concave part, 48 ... Small hole,
53 …… Pressing plate, 54 …… Screw, 55,56 …… Wedge, 57 ……
Screw, 60 ... Heating cylinder, 60a-60f ... Cylinder element body, 61 ... Observation window.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Seiichi Tsuchiya, No. 523 Nishinoyama, Fukusato, Futami-cho, Akashi-shi, Hyogo Prefecture Toyo Kikai Kinzoku Co., Ltd. (72) Shinji Murakami, Futami-cho, Akashi-shi, Hyogo Prefecture 523 No. 1 Nishinoyama, Fukuzato, inside Toyo Kikai Kinzoku Co., Ltd. (72) Inventor Susumu Hayasaki 523 No. 1 Nishinoyama, Fukuri, Nishimiyama Toyo Kikai Metals Co., Ltd. (72) Inventor Naohiko Tsuzuki No. 523 Nishinoyama, Fukusato, Futami-cho, Akashi-shi, Hyogo Toyo Kikai Kinzoku Co., Ltd. (56) Reference Japanese Patent Laid-Open No. 61-76331 (JP, A) Actual Development 61-24598 (JP, U)

Claims (5)

[Claims] 1. A heating cylinder, wherein a screw is rotatably arranged in the heating cylinder, and a slit-shaped observing portion for observing the interior extending in the axial direction of the heating cylinder is provided on a peripheral wall of the heating cylinder. The heating cylinder is vertically divided into two parts along the axial direction thereof, and the transparent tempered glass body arranged in the observation part is sandwiched by the divided peripheral wall bodies of the heating cylinder. Molding device characterized by being 2. A heating cylinder is used, a screw is rotatably arranged in the heating cylinder, and a slit-shaped observation portion for observing the interior extending in the axial direction of the heating cylinder is provided on a peripheral wall of the heating cylinder. In the above molding apparatus, the heating cylinder is configured by axially coupling a plurality of short cylinder element bodies, and the observing section is provided in at least one of the cylinder element bodies. Molding equipment. 3. The molding apparatus according to claim 2, wherein the observation section is provided on a plurality of the cylinder element bodies. 4. The observing part is provided only in a specific one of the cylinder element bodies according to claim 2, and the arrangement position of the cylinder element body having the observing part is variable. A molding device characterized by the above. 5. The columnar transparent tempered glass body according to claim 2, wherein the observation portion is provided with a columnar transparent tempered glass body, and the tempered glass body is pressed in one direction via a pressing plate along the longitudinal direction thereof. The molding apparatus is characterized in that