KR20090099482A - Method of molding a hollow molded article, hollow molded article, and apparatus for manufacturing the same - Google Patents

Abstract

A method of molding a hollow molded article, a hollow molded article, and an apparatus for manufacturing the same are provided to secure high molding accuracy and sufficient adhesion strength by using a contact-section of a pair of half-molded products through molding pressure. A method of molding a hollow molded article comprises the steps of: molding first and second half-molded products with moving mold(3) and fixed mold(1) to have a contact intersection plane; allowing the moving mold to slide in a state that the second half-molded product exists; matching each contact intersection plane; inserting a heater(41) between the contact intersections, wherein the heater is made of a halogen heater or a carbon heater; separating the heater after molding the contact intersection plane by the heater; and fusing the intersection planes by closing the moving and fixed molds.

Description

Method for molding hollow molded article, blow molded article and apparatus for manufacturing the same {METHOD OF MOLDING A HOLLOW MOLDED ARTICLE, HOLLOW MOLDED ARTICLE, AND APPARATUS FOR MANUFACTURING THE SAME}

In the first molding, the present invention provides a mold-closing movable mold and a fixed mold, in which the paired semi-molded articles are integrally formed to have a bonded cross section, and one semi-molded article is fixed to the other. The movable mold is moved toward the fixed mold with the semi-molded product remaining in the movable mold, respectively, and the pair of semi-molded products are opposed to each other in a state where the bonded end faces are separated, a heating body is inserted therebetween to melt the bonded end face, and then the heating body The present invention relates to a molding method of a hollow molded article obtained by evacuating, mold closing, fusion bonding, and obtaining a hollow molded article from a pair of semi-molded articles, a hollow molded article obtained by the implementation of this forming method, and a manufacturing apparatus thereof.

BACKGROUND ART A molding method using an injection molding machine is known as one of methods for producing hollow molded articles made of synthetic resins having complex shapes such as curved pipes, intake manifolds, and tanks. This injection molding machine is a set of metal mold | die, as also shown by patent document 1, 2. One mold of one set of molds is provided with a male mold and a female mold for forming one semi-hollow body, and the other mold is provided with a female mold and a male mold for forming the other semi-hollow body. Therefore, in the primary formation by such a mold, it is formed by forming a semi-hollow body or a divided body into two hollow products, and in the secondary formation, when the molten resin is injection-filled into the butt joint space, the pair is faced, The semi-hollow body of becomes a hollow product bonded at the divided surface. Thereby, a hollow molded article can be manufactured by injection molding. According to the molding method using such an injection molding machine, it is possible to produce a completely sealed hollow body product, and also to produce a hollow body product having a uniform thickness, and to cope with complicated shapes. However, depending on the hollow body product, manufacture by this shaping | molding method may be difficult. For example, in the case of producing a hollow body partitioned by ribs or wall surfaces, such as a tank in which the inside is divided into a plurality of missing parts by a plurality of ribs, the rib part may also be joined in secondary molding. Although necessary, manufacture is difficult with the above molding method. In this molding method, since the molten resin for bonding must be injected in the secondary molding, the structures of the injection molding machine and the mold become complicated, and the molding time becomes long. If the secondary injection pressure is small, the bonding force is weak. On the contrary, if the injection pressure is strong, the molten resin may leak from the joint end surface into the hollow product.

[Patent Document 1] Japanese Patent Application Laid-Open No. 62-87315

[Patent Document 2] Japanese Patent Laid-Open No. 6-246781

[Patent Document 3] Japanese Patent No. 3855083

 On the other hand, patent document 3 is mentioned as a direct prior art of this invention. Patent Document 3 describes a molding method in which a joint end surface of a semi-hollow molded article to be a primary molded pair is heated by contactless heating with a heating body and melted, and a joint end surface of the pair of semi-hollow molded articles is pressed to obtain a hollow molded article. . According to this molding method, the mold of the mobile mold and the fixed mold is closed, and the pair of semi-hollow molded articles are first molded so as to have a joining cross-section. Open the mold. Then, the movable die is slid to face the pair of semi-hollow molded articles, and the joining cross sections of the pair of semi-hollow molded articles are separated from each other. Then, a heating body having a planar heater such as a sheath heater, a ceramic film heater, an induction heating heater, and the like is inserted therebetween, the joint end surface is melted, and the heating body is evacuated, and then the mold is closed to join the end surface of the semi-hollow molded article. Can be pressed and fused in a mold to obtain a hollow molded article.

According to the invention described in Patent Literature 3, since it is not necessary to inject the molten resin for bonding when joining the cross sections of a pair of semi-hollow molded articles, an injection molding machine or an injection operation is simplified, and sufficient bonding strength can also be obtained. have. And like the rib mentioned above, there also exists an advantage that the hollow molded article of the complicated shape which has a junction part also inside can be manufactured easily. In addition, since a hollow molded article can be manufactured in the mold by melting the joint end surface of the semi-hollow molded article in the primary molded mold, a hollow molded article can be obtained with high dimensional accuracy, and welding jig or the like is not particularly necessary. There is also an advantage that a hollow molded article can be produced. However, improvement is also recognized. For example, although the heating body in invention of patent document 3 is a planar heater, even if power supply to a heater is started, heat is initially taken away by a heating body, and temperature does not rise rapidly. Therefore, in preparation for the process of melting the bonded end face, it is necessary to feed the heater at all times to heat the heating element, so it is necessary to consider heat insulation in particular so that energy is unnecessarily consumed and heat is not lost by conduction from the heating body to the outside. There is a need. And since the heating body is heated in the same way, it is not possible to control such as heating at different temperatures depending on the location of the melting. In addition, since the heating body has a predetermined weight, a relatively large device such as a driving device such as a piston cylinder unit for inserting and withdrawing the heating body between molds is required. And since it heats with a surface heater, the range to heat becomes wide and there exists a possibility that parts other than a joining end surface may also melt | dissolve.

In the invention described in Patent Document 3, there is no particular limitation on the type of heater, but in the specification, a sheath heater, a ceramic heater, and an induction heating heater are described as examples of the heater. Such a heater has a drawback in that the operation time from the power supply to the predetermined temperature is long, so it is necessary to start the power supply in anticipation of the operation time. By the way, in general, heating of the object by the heater is performed by radiation by infrared radiation. Since such a heater has a relatively low temperature of 600 ° C., the infrared rays emitted have a lot of far-infrared components. Far-infrared radiation takes a long time to heat the object because of the relatively small radiant energy, and has a high wavelength, so that the infrared ray has a high ability to penetrate the object, thereby heating the inside of the object. For this reason, it melt | dissolves not only in the vicinity of the surface of resin but also in the inside until it fully melts the surface resin. And since melting takes time, resin may be heated for a long time and the quality may be impaired. And the influence by heat conduction also becomes large. That is, when the heating time is long, the air around the heating body is heated, and since the heated air heats the resin in a wide range, there is also a problem that the quality of the resin is further impaired.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems. Specifically, a hollow molded article having a complicated shape can be molded with high precision, and sufficient bonding strength can be obtained, and a short time is required when melting the joint end surface of the semi-hollow molded article. Only the vicinity of the surface of the bonded end surface can be melted, and at the same time, other parts are not melted, so there is no problem of deterioration of the resin quality, and the heating body is lightweight and has low energy loss and adjusts the heating amount according to the melting point. It is an object of the present invention to provide a method for forming a hollow molded article and a manufacturing apparatus for a hollow molded article used in the practice of the method. Another object of the present invention is to provide a hollow molded article obtained by the molding method or manufacturing apparatus for the above-mentioned hollow molded article.

In order to achieve the above object, the present invention provides a molding method of a hollow molded article in which a joint end surface of a pair of semi-hollow molded articles is melted in a mold, and closed by fusion molding, whereby the joint end is melted. It is configured to use halogen heater or carbon heater of similar shape as. That is, the invention of claim 1 for achieving the above object is formed by forming a pair of semi-molded articles having a joining cross section by using a movable mold and a fixed mold which can be closed in primary molding, and one semi-molded product remains in secondary molding. The movable mold is moved relative to the fixed mold in such a state as to face the other semi-molded product so that the respective bonded sections are spaced at predetermined intervals, and a heater is inserted in a non-contact manner between the bonded sections of the pair of semi-molded products. In the method of forming a hollow molded article that melts and then the heater is evacuated, the movable mold is closed with respect to the fixed mold, and a pair of semi-molded articles are pressed into each other in a mold to fuse the bonded end faces. It is configured to control the exothermic timing and the exothermic temperature while using a halogen heater or a carbon heater. Invention of Claim 2 uses the linear heater formed in the form of a single letter similar to the said joining cross section in the shaping | molding method of Claim 1, and invention of Claim 3 is the above-mentioned in the shaping | molding method of Claim 2 The heater formed in the shape of a writing has a vertical relationship between the two parts E1 and E2 in the vertical direction, when two adjacent parts E1 and E2 have discontinuous disadvantage part D points. It is configured to be inserted between the joint end surface of the pair of semi-molded article so that the invention described in claim 4 is configured to use a plurality of independently controllable heaters for the heater in any one of the molding method of any one of claims 1 to 3. .

The invention according to claim 5 is characterized in that a plurality of semi-molded articles molded to have a bonded cross section by primary molding is formed by mold closing of the same mold whose joint cross-section is used for primary molding, or in a different mold. It is a hollow molded article that is squeezed and fused. The bonded end face is fused by a halogen heater or a carbon heater, and then evacuated to form a hollow molded article.

According to the sixth aspect of the present invention, there is provided a combination of a mold and a heater, wherein the mold has at least a fixed mold and a movable mold, and when the mold is closed with respect to the fixed mold at the first position, a pair of first, The first and second cavities for forming the two semi-molded articles are configured, and when the movable mold is moved by a predetermined amount, the recesses constituting the first and second cavities are matched with each other, and the second position is The halogen heater can be mold-closed with respect to the stationary mold while maintaining a predetermined interval between the stationary and movable parting surfaces, and the heater is configured to have a shape similar to the joining cross section of the first and second semi-molded articles. Or a carbon heater, wherein the heater is freely inserted and evacuated between the parting surfaces, and at the same time, the heating timing and the heating temperature are controlled. It is configured to be.

As described above, according to the present invention, the joint end surfaces of the paired semi-hollow molded articles are melted in the mold, the movable mold is closed with respect to the fixed mold, or a pair of semi-molded articles are pressed together with each other in the mold, thereby fusion bonding the joint ends. The hollow molded article of a complicated shape can also be molded with high precision, and sufficient joint strength can be obtained with this. According to the present invention, since a halogen heater or a carbon heater is used for melting the joined end surface of the semi-hollow molded article, when the power is supplied to the heater, the target temperature is quickly reached. Therefore, it is only necessary to feed the heater only in accordance with the molding cycle, that is, when melting the resin of the bonded cross section, and the strength and weakness of the temperature can be easily adjusted, so that the effect of joining without consuming unnecessary energy can also be obtained. In this way, since the control response of the heater is excellent, the heater can be precisely controlled in accordance with the type of resin, the shape and size of the bonded cross section, and the like. And since near-infrared and mid-infrared rays are irradiated with such a heater, only the relatively surface vicinity of a joining cross section is melted, and the effect which melt | dissolves to another part irrespective of joining can also be obtained. And since it can melt in a short time, it does not bring about resin deterioration by heat. In addition, since such a heater has a linear shape in which the heating element is covered with a tube-shaped quartz glass, the heater can be formed in any shape that has a single shape. Therefore, the heater can be easily formed into a shape similar to that of the bonded cross section, and only the bonded cross section can be melted. In addition, since the heater is composed of a halogen heater or a carbon heater, the weight can be reduced, so that the drive can be performed even with a compact and inexpensive drive device. Thus, since a drive apparatus can be miniaturized, it becomes easy to provide the robot chuck etc. which take out a molded article in the vicinity of a manufacturing apparatus. And since quartz glass does not deform | transform even if it becomes high temperature, the junction cross section and a heater space | interval can be adjusted with high precision, and the effect which can melt only the part which wants to melt correctly can also be acquired. According to another invention, since a plurality of heaters are used for the heaters and these heaters can be controlled independently, the heating amount can be adjusted according to the melting point by heating to different temperatures by the respective heaters.

The manufacturing apparatus of the hollow molded article which concerns on this embodiment is comprised from the metal mold | die and a heater apparatus. First, the metal mold | die which concerns on this embodiment is demonstrated. Although FIG. 1 (a) shows the mold according to the present embodiment in a mold-closed state, the mold is roughly a fixed mold 1, a movable mold 2 opened and closed with respect to the fixed mold 1, and An example of driving the movable die 3 and the movable die 3 which is slidably driven in the vertical direction with respect to the movable die 2 is composed of a drive device including the piston cylinder unit 4 and the like.

In Fig.1 (a), the recessed part 11 of the predetermined magnitude | size which dug in the inward direction from the parting surface P is formed in the upper position of the stationary die 1. As shown in Figs. This recessed part 11 is for forming the outer surface of the 1st semi-molded object A, as demonstrated later. In Fig.1 (a), hemispherical core 12 is provided in the downward position of the stationary die 1 so that it may protrude from the parting surface P. In FIG. This core 12 is for forming the inner surface of the second semi-molded article B. FIG.

An unillustrated gate communicating with the first spool 14 is opened at the bottom of the recessed portion 11 of the fixed mold 1 configured as described above, and is formed near the putting surface P of the bottom of the core 12. The gate which is not shown in the orient communicating with the two spools 15 is opened. The first and second spools 14 and 15 communicate with an injection nozzle of an injection machine (not shown) via the runner 16 and the main spool 17 formed in the stationary die 1. The main spool 17, the runner 16, the first spool 14, and the second spool 15 are for primary molding, and in this embodiment, there are no secondary molding runners or spools. Therefore, it has a simple mold structure.

In FIG. 1 (a), the hemispherical core which protrudes from the parting surface P to the stationary mold 1 on the side of the upper side of the movable mold 3 and pairs with the recess 11 of the stationary mold 1 is formed. (31) is provided. When the movable mold 3 is slid to the first position to be described later and the mold is closed with respect to the fixed mold 1, the recessed part 11 of the fixed mold 1 and the parting surface P of the movable mold 3 and the core of the movable mold 3 are closed. By 31, the 1st cavity C1 which shape | molds a 1st semi-molded object A is comprised. As described above, the outer surface of the first semi-molded product A is formed by the recess 11, the inner surface of the first semi-molded product A is joined by the core 31, and the joint cross section joined to the second semi-molded product B is the part of the mobile mold 3 It is formed by the surface P. At this time, since the core 31 of the movable die 3 is smaller than the recess 11 of the stationary die 1 by a predetermined amount, the first semi-molded article A is formed to have a predetermined thickness.

In Fig.1 (a), the recessed part 32 of the predetermined magnitude | size which dugs inward from the parting surface P on the side of the parting surface P below the moving mold 3, and is paired with the core 12 of the fixed mold | type 1 ) Is formed. The mold closing of the movable die 3 and the stationary die 1 at the first position results in the parting surface P of the stationary die 1, the core 12 of the stationary die 1, and the recess 32 of the movable die 3. The 2nd cavity C2 which shape | molds a 2nd semi-molded object B is comprised by this. As described above, the inner surface of the second semi-molded article B is joined to the first semi-molded article A by the core 12 of the stationary die 1, the outer surface by the recessed portion 32, and It is formed by the parting surface P of the stationary die 1. And since the recessed part 32 of the movable die 3 is larger than the core 12 of the stationary die 1 by the predetermined amount, the 2nd semi-molded object B will be formed in predetermined thickness.

The movable die 3 can be slid by the piston cylinder unit 4 to take the first and second positions relative to the stationary die 1. In Fig. 1 (a), a state in which the primary mold is formed, that is, a state in which the movable mold 3 takes the first position with respect to the fixed mold 1 and mold-closes it, is shown. By closing the stationary die 1 and the movable die 2 and driving the piston cylinder unit 4, the movable die 3 can take a second position with respect to the stationary die 1. In the second position, the recess 11 of the stationary die 1 and the recess 32 of the movable die 3 face each other. Therefore, the joining cross section of each of the 1st and 2nd semi-molded articles A and B can be fused as mentioned later.

The heater device 40 according to the present embodiment is installed in the vicinity of the stationary die 1 and the movable die 3, and is formed in a predetermined shape and formed into a predetermined shape, and has a linear heater 41 and a heater ( And a drive device for inserting or retracting 41 between the stationary die 1 and the movable die 3.

The heater 41 becomes a halogen heater or a carbon heater. The halogen heater is composed of a filament made of tungsten, a tube-shaped quartz glass covering the filament, and a halogen gas enclosed in the tube. When the filament is fed to the filament and the filament becomes hot, tungsten atoms evaporate from the filament.However, the halogen gas temporarily bonds with the tungsten atoms due to the so-called halogen cycle effect. Along with being able to make filament high temperature, it has a long service life. On the other hand, the carbon heater is composed of a heating element made of carbon wire, a tube-shaped quartz glass or the like covered with the heating element, and the carbon heater can also be heated to a high temperature and has a long life. Since such a heater reaches a target temperature 1 to several seconds after starting the power feeding, the control response is good and the temperature can be easily adjusted. Halogen heaters emit near infrared rays having a center wavelength of about 1.2 mu m, and carbon heaters emit mid infrared rays having a center wavelength of about 2 to 3 mu m. Since the near-infrared and the mid-infrared are both high in radiant energy, the resin can be melted in a short time. And since such an infrared ray has a small ability to penetrate an object, it melt | dissolves only resin near a surface quickly, and does not impair the quality of resin. And since mid-infrared rays have the ability to penetrate into an object slightly compared with near-infrared rays, although the thickness of melted resin becomes a little thick, it is easy to be absorbed by resin and melt | dissolves resin efficiently.

Such a heater 41 is formed in the shape of a writing in this embodiment so that it may be similar to the shape of a joining cross section. In the case where the shape of the joining end faces a and b is a circle, as shown in Fig. 1 (b), the heater 41 is also formed in a circle shape. At this time, there is a gap that cannot be formed in one writing, that is, a discontinuous disadvantage part (D). This disadvantage part D is caused by two parts E1 and E2 divided substantially in the up-down direction in a perpendicular direction in embodiment shown. When the heater 41 is inserted and heated between the joint sections, near-infrared and mid-infrared rays are not radiated in the disadvantage section D, so that the amount of heat dose irradiated to the joint section corresponding to the disadvantage section D is reduced. However, if the two parts E1 and E2 are inserted in the vertical direction in the vertical direction, the disadvantage part D is located above the part E2, so that it is heated to the part E2 of the heater 41. Air rises and the junction cross section corresponding to the disadvantage part D melts sufficiently, and melt nonuniformity does not arise.

This heater 41 is supported by the heat resistant support part 42, and is attached to a drive apparatus. The drive device includes a guide rail 44, a support frame 45 guided by the guide rail 44, a piston cylinder unit 46 for driving the support frame 45, and the like. And when the heater 41 is attached to the front-end | tip of the support frame 45 through the heat-resistant support part 42, and the piston cylinder unit 46 is driven, the heater 41 will be fixed 1 and the movable 3. Intervened or retracted as shown in FIG. 1 (b). The heater 41 is powered by the cable 48 of the power supply control device 47 as needed.

Next, with reference to FIG. 2, FIG. 3, the manufacturing example of the hollow molded article using the said manufacturing apparatus is demonstrated. The piston cylinder unit 4 of the movable die 3 is driven to position the movable die 3 in the first position, that is, the position shown in Fig. 2 (a), and mold closing is performed using a mold closing device (not shown). In this case, as described above, the first cavity C1 for molding the first semi-molded article A and the second semi-molded article B for shaping the first semi-molded article A by the stationary die 1 and the movable die 3 are formed. Two cavities C2 are configured.

By an injection machine not shown, the plasticized molten resin is injected into the main spool 17. Molten resin is filled at the same time into the respective cavity (C1, C2) via the gate through the runner 16, the first and second spools (14, 15). Thereby, as shown in FIG. 2 (b), the first and second semi-molded articles A and B are formed at substantially the same time. Wait for some cooling solidification. This ends the primary molding.

Next, as shown in Fig. 2C, the movable die 2, that is, the movable die 3 is opened. Then, the first semi-molded product A is on the stationary mold 1 side, and the second semi-molded product B is on the movable mold 3 side, depending on the shape, area, or protrusion of the semi-molded articles A and B, respectively. Is opened. As shown in Fig. 2 (d), the piston cylinder unit 4 is driven and the movable die 3 is slid to the second position. Then, the joining end surface a and b of each of the 1st, 2nd semi-molded articles A and B is matched by spaced only a predetermined space | interval.

The piston cylinder unit 46 for the heater 41 is driven. Then, the heater 41 is inserted between the joining end surfaces a and b. When inserted, the surface of the heater 41 and the joint end face a and between the surface of the heater 41 and the joint end face b are 0.5 mm to 50 mm. In consideration of the type of resin, the shape, size of the bonding end surfaces a and b, the strength and weakness of the bonding, and the like, the energization timing, the heat generation temperature, and the like are set in the power supply control device 47. In this way, electric power is supplied to the heater 41. Then, near-infrared or mid-infrared rays are irradiated to the joining end surfaces a and b, and they are heated and melted in a short time in a non-contact manner. In this way, the state in which the heater 41 is inserted or heated is shown in Fig. 3A. When the joined end surfaces a and b are melted, the power supply to the heater 41 is stopped, and the piston cylinder unit 46 is driven to retract the heater 41. Then, the mold is closed as shown in FIG. By the mold closing, the first and second semi-molded articles A and B are fused at the joint end faces a and b. This completes secondary molding. As shown in Fig. 3 (c), when the mold is opened and closed, an ejector pin (not shown) pops out, and the hollow molded product AB is taken out. The movable die 3 is slid to the first position shown in Fig. 2A, and primary molding is performed as described above. Hereinafter, a hollow molded article AB is produced in the orient.

According to this embodiment, since the heater 41 is inserted and energized, and it stops after evacuating a heater, joining end surface a, b is heated similarly, and a fusion nonuniformity does not arise. That is, when using a heater with poor responsiveness as in the prior art, when the heater is energized, heated before evacuating the heater, evacuated and then stopped, the time heated by the heater becomes longer in the place near the insertion, and in the distant place. Although it becomes short and melt | dispersion nonuniformity becomes a result, the strength of a joining part arises as a result, but according to this embodiment, since the halogen heater or the carbon heater which is excellent in thermal response is applied, on and off control as mentioned above. Even if the molding cycle is not particularly long, there is no melt unevenness.

Next, the heater apparatus in the case of manufacturing the tank 60 in which the inside is divided | segmented into a some loss | loss by a some rib is demonstrated. 4 (a), a pair of semi-hollow molded articles 61 and 61 'constituting the tank 60 are shown. The semi-hollow molded articles 61 and 61 'have ribs 63, 63, ... (63', 63 ', ...) inside (the rib of the semi-hollow molded article 61' is not shown in the drawing, but for convenience of explanation, It will be described as'). Although it will be easily understood by those skilled in the art, the detailed description will not be made, but the pair of semi-hollow molded articles 61 and 61 'is joined to the joint end face 64 (64') (the joint cross section of the semi-hollow molded article 61 'is shown in the drawings. But it will be described as 64 'for convenience of description), it is possible to form a tank 60 divided into three lost inside. In the case of melting these joint sections 64 and 64 ', the heater requires at least two strands. In FIG.4 (b), the top view of the joint end surface 64 of the semi-hollow molded article 61 is shown by the dotted line. Bonding of the first heater 66 and the ribs 63, 63, ... (63 ', 63', ...) that melt the joint end surfaces 64, 64 'of the semi-hollow molded articles 61, 61'. A second heater 67 for melting the cross section is formed as shown in the figure. Thus, the joint end surfaces 64, 64 'of the semi-hollow molded articles 61, 61' and the joint end surfaces of the ribs 63, 63, ... can be melted in the same manner. When the thickness of the ribs 63 and 63 is thinner than the outer wall portion of the tank 60, when the first heater 66 is heated to a higher temperature than the second heater 67, the joint end face 64 (64 ′) ) Can be melted uniformly. When the joint end face 64 (64 ') is curved as shown in Fig. 4A, the first and second heaters 66 and 67 also need to be formed as curved surfaces. When the first and second heaters 66 and 67 are inserted in the direction indicated by the arrow Y1, the first and second heaters 66 and 67 are not interfered with the joint end surfaces 64 and 64 '.

In the above embodiment, an example of manufacturing a completely sealed hollow molded article has been described, but it is clear that a partially opened hollow molded article can be produced in the Orient. And it is also clear that three or more primary hollow molded articles can be manufactured. Therefore, the hollow molded article includes a molded article partially opened and a molded article molded into three or more primary molded articles. And it is also clear that it can implement by rotating instead of sliding a movable type. In the above embodiment, although the secondary molding is performed by mold closing the movable die 3 with respect to the stationary die 1, the secondary molding is performed by using another mold (not shown) as described above. It can melt | fuse together and fusion | melt a joining cross section.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the manufacturing apparatus which concerns on embodiment of this invention, (a) is sectional drawing which shows the state which mold-closed, and (b) shows typically a part of mold and a heater apparatus. Perspective view.

It is a figure for demonstrating the shaping | molding method of the hollow molded article which concerns on embodiment of this invention, (a)-(d) is sectional drawing which shows each step in the middle of manufacturing a hollow molded article.

It is a figure for demonstrating the shaping | molding method of the hollow molded article which concerns on embodiment of this invention, (a)-(c) is sectional drawing which shows each step in the middle of manufacturing a hollow molded article.

4 is a view showing another embodiment, (a) is a perspective view showing a pair of semi-hollow molded articles having ribs therein, and (b) thereof is an embodiment of a heater for molding the semi-hollow molded articles It is a top view which shows.

[Description of Drawing Reference]

1: fixed type 2: movable type

3: movable type 4: piston cylinder unit

40: heater device 41: heater

46: piston cylinder unit 47: power control device

C1, C2: 1st, 2nd cavity

A, B: pair of semi-hollow molded products

Claims (6)

In primary molding, mold-closing movable molds and fixed molds are used to form a pair of semi-molded parts to have a bonded cross section, In secondary molding, the movable mold is moved with respect to the fixed mold with one semi-molded product remaining so as to face the other semi-molded product so that each joint section is spaced at a predetermined interval, and between the joint ends of a pair of semi-molded articles. Of the hollow molded article contactlessly inserting the heater into the contact mold, melting the bonded end face, evacuating the heater, mold closing the movable mold with respect to the fixed mold, or pressing a pair of semi-molded articles into each other in the mold. In the molding method, The method of forming a hollow molded product, characterized in that for controlling the heat generation timing and the heat generation temperature while using a halogen heater or a carbon heater. The method of claim 1, A method for forming a hollow molded article, characterized by using a linear heater formed in a single shape similar to the joining cross section. The method of claim 2, When the non-continuous disadvantage part (D) has arisen by the two adjacent parts E1 and E2 formed in the said writing form, the two parts E1 and E2 are vertically up and down. A method of molding a hollow molded article, characterized in that it is inserted between the end faces of the pair of semi-molded articles in a relation. The method according to any one of claims 1 to 3, The method of molding a hollow molded article, characterized in that a plurality of heaters that can be independently controlled are used as the heaters. Hollow molded articles in which a plurality of semi-molded articles molded to have a bonded cross section by primary molding are fused by mold closing of the same mold used for primary molding, or semi-molded articles are squeezed together in another mold. , A hollow molded article in which the bonded end face is evacuated and fused after being melted by a halogen heater or a carbon heater. Made of a combination of mold and heater, The mold has at least a stationary mold and a movable mold, and when the movable mold is closed with respect to the fixed mold in a first position, first and second cavities for forming a pair of first and second semi-molded articles having a joining cross section are formed. , When the movable mold is moved by a predetermined amount, the recesses constituting the first and second cavities are matched with each other, and in this matched second position, the part between the fixed mold and the movable mold part can be maintained at a predetermined interval. The mobile mold may be closed against the fixed mold, The heater is made of a halogen heater or a carbon heater configured in a shape similar to the joint section of the first and second semi-molded products, the heater is inserted and retracted freely between the parting surface, and the heating timing and the heating temperature are controlled. Apparatus for producing a hollow molded article, characterized in that the.

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