JP3186539U - Suction blow molding equipment - Google Patents

Abstract

There is provided a parison blow molding apparatus that more reliably molds a bent product so that the parison is less in contact with a molding surface of a cavity and the temperature of the parison can be maintained. .
A suction blow molding device is an inlet of a mold that is clamped, and is hot air that blows hot air along a direction in which a parison is introduced from the inlet into which the parison is placed into the cavity. The parison 31 is introduced with respect to the introduced parison 31 provided on the molding surface 34 inside the bend among the blowout portion 23 and the molding surface of the cavity bent in the direction in which the parison is introduced. A hot air blowing section 32 that blows out hot air in a direction intersecting the direction in which the air is blown.
[Selection] Figure 4

Description

  The present invention relates to a suction blow molding apparatus, and more particularly, to a blow molding apparatus that can be more reliably molded.

  A cylindrical parison is formed from a molten plastic molding material by a die, and the parison is guided into a mold cavity together with an air flow, a tube is inserted into the parison, and air is blown into the parison for molding. Suction blow molding for forming products is used.

  2. Description of the Related Art Conventionally, there is a technique in which air is pumped from the side surface of a mold to the parison to prevent contact between the mold and the parison and to prevent the parison from being displaced (see, for example, Patent Document 1).

JP-A-4-74632

  However, when trying to mold a bent molded product, it may come into contact with the molding surface of the cavity that is bent in the direction in which the parison is introduced. When the parison contacts the molding surface of the cavity, the temperature of the parison decreases and the flexibility of the parison decreases. Then, even if air is blown into the parison, it does not expand uniformly, resulting in poor molding.

  The present invention has been made in view of such circumstances, and when trying to mold a bent molded product, the parison is less likely to contact the molding surface of the cavity, and the temperature of the parison is maintained. Thus, the bent product can be more reliably formed.

  One aspect of the present invention is an inlet of a mold that is clamped, and is a first inlet that blows hot air along a direction in which the parison is introduced from the inlet into which the parison is inserted into the cavity. Of the molding surface of the cavity that is bent in the direction in which the hot air blowing means and the parison are introduced, the parison is provided on the molding surface that is provided on the molding surface inside the bending. It is a suction blow molding apparatus provided with the 2nd hot air blowing means which blows off hot air in the direction which cross | intersects the direction introduced.

  In one aspect of the present invention, from the first hot air blowing means, an inlet of a mold that is clamped is directed from the inlet into which the parison is placed into the cavity, and along the direction in which the parison is introduced into the cavity. Among the molding surfaces of the cavity that are bent in the direction in which the hot air is blown out and the parison is introduced, the second hot air blowing means provided on the molding surface inside the bending is applied to the introduced parison. Since the hot air is blown out in a direction intersecting the direction in which the parison is introduced, the parison can be less in contact with the molding surface of the cavity bent in the direction in which the parison is introduced. Since the temperature of the parison can be maintained by hot air, the bent product can be more reliably molded.

  The die for forming the parison may be provided with first hot air blowing means, and the first hot air blowing means may blow hot air heated by the heat of the die. In this case, the air can be heated using the heat of the die that is at a high temperature in order to mold the parison in the molten state of the plastic molding material, and there is no need to provide a separate heating device.

  In the second hot air blowing means, compared to the amount of hot air at a position farther from the inlet of the cavity than the apex of the bending surface of the cavity in the direction in which the parison is introduced, at a position closer to the inlet of the cavity than the apex, More hot air can be blown out. In this case, compared to the part located farther from the entrance of the cavity than the apex, the parison part located closer to the cavity entrance than the apex has a greater force to bend as the cavity molding surface bends. Since it is added, this force can be countered by hot air with a larger air volume. Accordingly, the parison can be less contacted with the molding surface of the bent cavity, and the temperature of the parison that starts to bend can be maintained, so that the parison is easily bent. Accordingly, the bent product can be more reliably formed.

  The second hot air blowing means can blow hot air whose angle between the direction in which the parison is introduced and the direction of the hot air is 90 degrees or more. The hot air against the flow of hot air from the first hot air blowing means can apply force to the parison in a direction away from the molding surface of the bent cavity, so that the parison contacts the molding surface. Can be reduced.

  It is possible to further provide a drawing-in means for drawing air, which is provided on the molding surface on the outer side of the bend, facing the molding surface on which the second hot air blowing means is provided. In this case, since the force is applied to the parison in a direction away from the molding surface of the bent cavity by the hot air, it is possible to reduce the parison from contacting the molding surface. Moreover, since the parison is pulled toward the molding surface side outside the bend, it is possible to prevent the parison from being crushed by a force from one direction caused by hot air.

  Control means for controlling the air volume and temperature of the hot air blown from the first hot air blowing means and the air volume and temperature of the hot air blown from the second hot air blowing means can be further provided. Since the air volume and temperature of the hot air can be controlled in accordance with the speed at which the parison is introduced, the parison can be less in contact with the molding surface of the cavity bent in the direction in which the parison is introduced. Thus, the temperature of the parison can be maintained. As a result, the bent product can be more reliably molded.

  As described above, according to one aspect of the present invention, the parison is less likely to come into contact with the molding surface of the cavity, and the temperature of the parison can be maintained, so that the molded product to be bent can be further reduced. Can be molded reliably.

It is a front view which shows an example of a structure of the suction blow molding apparatus. 1 is a top view illustrating an example of a configuration of a suction blow molding apparatus 1. FIG. It is a front view which shows the state of the suction blow molding apparatus 1 by which the parison shape | molded by the die | dye 14 is introduce | transduced into the molds 11-1 and 11-2 clamped. It is front sectional drawing which shows the example of the state in the cavity of the molds 11-1 and 11-2 clamped by which the parison 31 shape | molded by the die | dye 14 is introduce | transduced. The state of the suction blow molding apparatus 1 in which the molds 11-1 and 11-2 are clamped, the sealing molds 15-1 and 15-2 are clamped, and the air valve 20 and the blow pin 18 are moved forward is shown. It is an enlarged top view. It is a front view which shows the other example of a structure of the suction blow molding apparatus.

  Embodiments of the present invention will be described below. Correspondences between the configuration requirements of the present invention and the embodiments described in the detailed description of the invention are exemplified as follows. This description is intended to assure that embodiments supporting the present invention are described in the detailed description of the invention. Therefore, although there are embodiments that are described in the detailed description of the invention but are not described here as embodiments corresponding to the constituent elements of the present invention, It does not mean that the embodiment does not correspond to the configuration requirements. Conversely, even if an embodiment is described here as corresponding to a configuration requirement, that means that the embodiment does not correspond to a configuration requirement other than the configuration requirement. It's not something to do.

  A suction blow molding apparatus according to one aspect of the present invention is an inlet of a mold that is clamped, and is configured to move hot air along a direction in which the parison is introduced from the inlet into which the parison is inserted into the cavity. Among the molding surfaces of the cavity bent in the direction in which the first hot air blowing means (for example, hot air blowing portion 23 in FIG. 4) and the parison are introduced, are provided on the molding surface inside the bend. And a second hot air blowing means (for example, hot air blowing section 32 in FIG. 4) for blowing hot air in a direction intersecting the direction in which the parison is introduced with respect to the introduced parison. .

  Further provided is a drawing means for drawing air (for example, the drawing section 33 in FIG. 4) provided on the molding surface on the outer side of the bend, facing the molding surface provided with the second hot air blowing means. Can do.

  Control means for controlling the air volume and temperature of hot air blown from the first hot air blowing means and the air volume and temperature of hot air blown from the second hot air blowing means (for example, hot air blowing control unit 26 in FIG. 1) Further, it can be provided.

  Hereinafter, a suction blow molding apparatus according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a front view showing an example of the configuration of the suction blow molding apparatus 1. FIG. 2 is a top view showing an example of the configuration of the suction blow molding apparatus 1 as seen from the cross section AA ′ in FIG. 1.

  In addition, the front-back direction with respect to the suction blow molding apparatus 1 is illustrated with the Y axis, the up and down direction is illustrated with the Z axis, and the left and right directions are illustrated with the X axis. Hereinafter, the left side in FIG. 1 in the X-axis direction is simply referred to as the left side, and the right side in FIG. 1 in the X-axis direction is simply referred to as the right side. Further, hereinafter, the near side in FIG. 1 in the Y-axis direction is simply referred to as a front side, and the back side in FIG. 1 in the Y-axis direction is simply referred to as a rear side. Furthermore, hereinafter, the upper side in FIG. 1 in the Z-axis direction is simply referred to as the upper side, and the lower side in FIG. 1 in the Z-axis direction is simply referred to as the lower side.

  The suction blow molding apparatus 1 forms a cylindrical parison from a plastic molding material such as nylon (trademark) 6 or nylon 6,6, and introduces the parison into the mold cavity together with hot air. In the suction blow molding apparatus 1, when the parison is introduced into the cavity of the mold, the parison is introduced from the molding surface inside the bending among the molding surfaces of the cavity bent in the direction in which the parison is introduced. Hot air is blown out in a direction that intersects the direction of the air. And the suction blow molding apparatus 1 inserts a tubular needle into a parison and blows a gas such as air into the parison to mold a molded product.

  Suction blow molding apparatus 1 includes molding dies 11-1 and 11-2, bases 12-1 and 12-2, mold clamping portions 13-1 and 13-2, die 14, and sealing dies 15-1 and 15-2. , Bases 16-1 and 16-2, mold clamping parts 17-1 and 17-2, blow pin 18, guide 19, air valve 20, air cylinder 21, suction part 22, hot air blowing part 23, blower part 24, heating part 25 And a hot air blowing control unit 26.

  The molds 11-1 and 11-2 are two-part split molds (molds). Of the surfaces of the molding dies 11-1 and 11-2, the molded product is placed on the surface side in contact with each other, that is, on the right side of the molding die 11-1 and the left side of the molding die 11-2 in FIG. A molding surface for molding is formed. For example, the molds 11-1 and 11-2 are molds for molding a product portion used as a product among the molded products. That is, when the molds 11-1 and 11-2 are clamped by moving in the direction indicated by the arrow T in FIG. 1, a cavity is formed by the molding surfaces of the molds 11-1 and 11-2. The The molds 11-1 and 11-2 are provided with a temperature adjusting device (not shown) for adjusting the temperature.

  The base 12-1 fixes the molding die 11-1, and the base 12-2 fixes the molding die 11-2. The bases 12-1 and 12-2 are moved on the frame of the suction blow molding apparatus 1 by the mold clamping portions 13-1 and 13-2 together with the fixed molds 11-1 and 11-2, respectively. It is done. The mold clamping portions 13-1 and 13-2 are hydraulically, electrically driven, air, or the like as a power source, and the bases 12-1 and 12-2 together with the molds 11-1 and 11-2 are indicated by an arrow T in FIG. Move in the indicated direction or in the opposite (opposite) direction (left-right direction). That is, the mold clamping portions 13-1 and 13-2 move the bases 12-1 and 12-2 in the direction indicated by the arrow T in FIG. Combine 1 and 11-2 and clamp. Further, the mold clamping portions 13-1 and 13-2 move the bases 12-1 and 12-2 in a direction opposite (opposite) to the direction indicated by the arrow T in FIG. -1 and 11-2 are separated and the mold is opened.

  The die 14 forms a cylindrical parison from the molding material and pushes it downward in FIG. That is, the pellet-shaped molding material put into a hopper (not shown) is kneaded and melted by an injection screw (not shown) and supplied to the die 14. The die 14 is formed into a cylindrical shape by extruding a molten molding material from a parison forming cavity that gradually decreases in diameter toward the bottom formed between the die head and the core provided therein. The parison is formed and the parison is pushed downward in FIG.

  The sealing dies 15-1 and 15-2 can be opened and closed by the bases 16-1 and 16-2 and the mold clamping portions 17-1 and 17-2. The sealing dies 15-1 and 15-2 are sealed with a parison extruded downward from the die 14, and when closed, form a cavity with an internal molding surface. At the upper ends of the sealing dies 15-1 and 15-2, a sealing part that seals with a parison is provided. Formed below the sealing portions of the sealing dies 15-1 and 15-2 is a molding surface whose upper side forms a substantially hemispherical cavity when closed.

  The base 16-1 is provided on the molding die 11-1 and the base 12-1, and holds the sealing die 15-1 in a movable manner. The base 16-2 is provided on the molding die 11-2 and the base 12-2, and holds the sealing die 15-2 in a movable manner. The mold clamping portions 17-1 and 17-2 use hydraulic pressure, electric power, air, or the like as a power source, and the sealing molds 15-1 and 15-2 are in the direction indicated by the arrow T in FIG. ) Direction (left-right direction). That is, the mold clamping unit 17-1 is fixed to the base 16-1, and the sealing mold 15-1 held movably on the base 16-1 is moved in the direction indicated by the arrow T in FIG. Move in the opposite direction. The mold clamping part 17-2 is fixed to the base 16-2, and the sealing mold 15-2 held movably on the base 16-2 is moved in the direction indicated by the arrow T in FIG. Move in the direction.

  In other words, the mold clamping parts 17-1 and 17-2 are formed by combining the sealing part of the sealing mold 15-1 and the sealing part of the sealing mold 15-2, and the molding surface of the sealing mold 15-1. The sealing molds 15-1 and 15-2 are combined and clamped so that the molding surface of the sealing mold 15-2 is aligned. Further, the mold clamping portions 17-1 and 17-2 are opened by separating the sealing molds 15-1 and 15-2.

  The blow pin 18 is made of a metal needle or the like and is formed of a tubular needle having a sharp tip. The blow pin 18 is inserted into a parison and blows air such as air (so-called air) or nitrogen having a predetermined pressure. Hereinafter, a case where air is blown into a parison will be described as an example. The guide 19 is formed in a block shape and is arranged along the parting lines of the mold clamping portions 17-1 and 17-2 when the mold clamping is performed. The guide 19 guides the blow pin 18 to the sealing molds 15-1 and 15-2 by the provided holes. The hole provided in the guide 19 for guiding the blow pin 18 is located on the surface where the parting lines of the sealing molds 15-1 and 15-2 are arranged when the mold is clamped. The air valve 20 is an air switching valve that is electromagnetically turned on and off by control of a blow control unit (not shown), and supplies air by supplying air to the blow pin 18 or stops air flowing to the blow pin 18 by blocking air.

  The air cylinder 21 moves the air valve 20 and the blow pin 18 by air. That is, the air cylinder 21 is a parison located in a portion formed in a substantially hemispherical shape among the cavities of the sealing molds 15-1 and 15-2 that are closed and sealed with a sealing portion. The blow pin 18 is pierced into this part so as to cross the parting lines of the sealing molds 15-1 and 15-2.

  Further, on the rear side of the mold 11-1, a suction part 22 is provided that generates a negative pressure in the air in the cavity formed by the closed molds 11-1 and 11-2. The suction part 22 is configured by an air pump or the like that discharges air to the outside. Moreover, the lower end sealing part (not shown) which seals the lower end of a parison is provided in the rear side of the shaping | molding die 11-1.

  Furthermore, a hot air blowing section 23 is provided on the lower side of the die 14, that is, on the side of the extrusion port for extruding and discharging the parison. The hot air blowing section 23 is formed in a substantially donut shape surrounding the extrusion opening of the die 14 so as not to disturb the discharge of the parison from the extrusion opening of the die 14. When the parison is pushed out from the die 14, the hot air blowing section 23 blows hot air into the cavity from the inlets of the molds 11-1 and 11-2 that are clamped along the direction in which the parison is pushed out.

  That is, the hot air blowing section 23 is provided in the die 14 for molding the parison, and the hot air heated by the heat of the die 14 is supplied to the inlets of the molding dies 11-1 and 11-2 which are molds that are clamped. Then, from the entrance where the parison is put, it goes into the cavity and blows out along the direction in which the parison is introduced into the cavity.

  More specifically, the hot air blowing portion 23 is formed of a material such as a metal having high thermal conductivity. Thereby, the heat of the die | dye 14 is conducted by the hot air blowing part 23, and the hot air blowing part 23 itself is heated. The air passing through the hot air blowing section 23 is heated by the hot air blowing section 23. Below the hot air blowing portion 23, a blowing port for blowing hot air is provided. The outlet of the hot air outlet 23 is formed as a hole-like nozzle, or is formed of a porous material that is resistant to heat, such as sintered metal or ceramic. From the outlet of the hot air blowing section 23, air heated by passing through the inside of the hot air blowing section 23 is blown out as hot air.

  As described above, the hot air blowing section 23 is an inlet of the molds 11-1 and 11-2 that are molds that are clamped, and enters the cavity from the inlet where the parison is inserted, and the parison is introduced into the cavity. Hot air is blown out along the direction. The hot air blowing section 23 is provided on the die 14 for molding the parison, and blows hot air heated by the heat of the die 14.

  The blower unit 24 is configured by a blower fan, an air pump, a compressor, or the like, sucks air from the outside, and blows air (sends air) to the hot air blowing unit 23 and the heating unit 25. The heating unit 25 includes an electric heater, a heat exchanger that exchanges heat of steam, and the like, and heats air sent from the blower unit 24 by generating heat or transferring heat. The air sent from the blower 24 and heated by the heater 25 is supplied to the mold 11-2.

  The hot air blowing control unit 26 includes a dedicated controller incorporating a programmable sequencer, a microprocessor, and the like, and controls the blowing of the blowing unit 24 and the heating of the heating unit 25 by sending drive power, a control signal, and the like. . That is, the hot air blowing control unit 26 controls the blowing of the blowing unit 24 and the heating of the heating unit 25, thereby providing the amount and temperature of hot air blown from the hot air blowing unit 23 and the molding die 11-2. The volume and temperature of hot air blown out from the hot air blowing section 32 (described later) are controlled.

  1 and 2 show a state of the suction blow molding apparatus 1 in which the mold 11-1 and the mold 11-2 are separated and the mold is opened. In the state where the molds 11-1 and 11-2 are opened, the sealing molds 15-1 and 15-2 are also opened, and the blow pin 18 is also retracted. That is, the sealing mold 15-1 is moved to the left side by the mold clamping part 17-1, and the sealing mold 15-2 is moved to the right side by the mold clamping part 17-2. The blow pin 18 and the air valve 20 are moved rearward by an air cylinder 21.

  The suction blow molding apparatus 1 performs a suction blow molding process, starting from a state in which the molding dies 11-1 and 11-2 shown in FIGS. 1 and 2 are opened. First, the molds 11-1 and 11-2 are clamped, and in this state, the parison is introduced into the cavities of the molds 11-1 and 11-2. Next, the sealing molds 15-1 and 15-2 are clamped, and the upper end of the parison is sealed. Then, the blow pin 18 is inserted into the parison, and air is blown into the parison, and a molded product corresponding to the shape of the cavity of the molds 11-1 and 11-2 is molded.

  Hereinafter, the state of the suction blow molding apparatus 1 until the molded product is molded will be described with reference to the drawings.

  From the state shown in FIGS. 1 and 2, the mold clamping portions 13-1 and 13-2 move the molding die 11-1 to the right side together with the base 12-1, and the molding die 11- together with the base 12-2. 2 is moved to the left, and the molds 11-1 and 11-2 are combined and clamped so that the molding surfaces thereof are aligned. The die 14 forms a cylindrical parison from the molding material and pushes it downward. The parison extruded downward from the die 14 is introduced into the cavity from the inlets of the molds 11-1 and 11-2 that are clamped. The hot air blowing portion 23 is an inlet of the molding dies 11-1 and 11-2, which are molds that are clamped, and is directed from the inlet into which the parison is placed into the cavity, and in the direction in which the parison is introduced into the cavity. Blow hot air along. The suction part 22 generates a negative pressure in the air in the cavities of the molds 11-1 and 11-2 and draws in hot air. Thereby, the parison is drawn into the cavities of the molds 11-1 and 11-2 together with the hot air.

  An air nozzle may be provided at the center of the extrusion port of the die 14 so that hot air is blown out from the air nozzle so that the hot air flows inside the parison.

  FIG. 3 is a front view showing a state of the suction blow molding apparatus 1 in which the parison molded by the die 14 is introduced into the cavities of the molds 11-1 and 11-2 which are clamped. In a state where the molds 11-1 and 11-2 are clamped, the upper ends of the cavities open on the upper surfaces of the molds 11-1 and 11-2. This upper end is circular, and its diameter is larger than the diameter of the parison. The upper end of the open cavity is an example of an inlet of a mold that is clamped and into which a parison is placed.

  As shown in FIG. 3, the upper end of the cavity is disposed directly below the die 14 in a state where the molds 11-1 and 11-2 are clamped. When the die 14 forms the cylindrical parison 31 from the molding material and extrudes downward, the parison 31 is introduced into the cavity from the upper end of the cavity on the upper surfaces of the molds 11-1 and 11-2. At this time, the die 14 pushes out the parison 31, and the hot air blowing section 23 blows hot air along the direction in which the parison 31 is introduced into the cavity from the upper end of the cavity that is the entrance, and the parison 31. The hot air is made to flow along the outside of the parison 31 to form an air flow by the hot air. Further, a suction portion 22 is provided on the rear side of the mold 11-1, and hot air flowing along the parison 31 from the die 14 is drawn together with the parison 31.

  FIG. 4 shows an example of the state in the cavity of the molds 11-1 and 11-2 which are clamped, into which the parison 31 formed by the die 14 is introduced, as viewed from the cross-section BB ′ in FIG. It is front sectional drawing. The parison 31 formed by the die 14 is introduced into a cavity bent in the direction in which the parison 31 is introduced, as indicated by an arrow C in FIG. Hereinafter, the side closer to the entrance of the cavity is also referred to as the upstream side, and the side farther from the entrance of the cavity is also referred to as the downstream side.

  As shown by an arrow D in FIG. 4, the hot air blowing section 23 is directed from the upper end of the cavity, which is the entrance of the cavity formed by the molds 11-1 and 11-2, which are clamped, into the cavity. Hot air is blown out along the direction in which the parison 31 is introduced into the cavity, and the hot air is caused to flow along the parison 31 to form an air flow by the hot air outside the parison 31. The temperature of the hot air blown out from the hot air blowing portion 23 is set to a temperature within a range where the parison 31 can be formed.

  Further, when an air nozzle is provided at the center of the extrusion port of the die 14 so as to blow hot air from the air nozzle, the hot air flows inside the parison 31.

  The molding die 11-2 is provided with a hot air blowing portion 32. Moreover, the drawing-in part 33 is provided in the shaping | molding die 11-1. As shown by an arrow E in FIG. 4, the hot air blowing section 32 is supplied with air sent from the blower section 24 and heated by the heating section 25. The hot-air blowing section 32 is a molding surface 34 of the cavity that is bent in the direction in which the parison 31 is introduced, and a molding surface 34 inside the bending cavity (the side closer to the center of the circle indicating the curvature radius of bending) Of the molding surface 34). As shown by an arrow F in FIG. 4, the hot air blowing section 32 blows hot air in a direction intersecting the direction in which the parison 31 is introduced with respect to the introduced parison 31. The amount of hot air blown out from the hot air blowing section 32 is such that it does not deform the parison 31 and prevents the parison 31 from approaching the molding surface 34. The temperature of the hot air blown out from the hot air blowing section 32 is set to a temperature within a range where the parison 31 can be formed.

  For example, in FIG. 4, the molding surface 34 of the cavity is bent in the direction in which the parison 31 is introduced from the top-down direction to the left-to-right direction. For example, the hot air blowing section 32 is provided on the inner molding surface 34 located on the right side in FIG. 1 among the molding surfaces 34 bent from the top-to-bottom direction to the left-to-right direction. It can be said that the hot air blowing section 32 forms a part of the molding surface 34 of the cavity, and forms one smooth surface together with the other molding surfaces 34.

  More specifically, the hot air blowing section 32 has a predetermined length upstream of the bending vertex of the cavity molding surface 34 among the molding surfaces 34 inside the bent cavity, and the cavity molding. A predetermined length is formed downstream of the apex of the bending of the surface 34. More specifically, the hot air blowing portion 32 is linear in the direction in which the parison 31 is introduced upstream of the bending vertex of the cavity molding surface 34 among the molding surfaces 34 inside the cavity being bent. Further, the length of the cavity is formed in a range of a straight line in the direction in which the parison 31 is introduced downstream from the apex of the bending of the molding surface 34 of the cavity.

  The hot air blowing portion 32 is formed by forming a hole in a metal in a nozzle shape, or is formed of a porous material that is resistant to heat, such as sintered metal or ceramic. More preferably, the hot air blowing section 32 blows out a larger amount of hot air on the inlet side to the bending of the molding surface 34 of the cavity, which is located above the apex of the bending of the molding surface 34 of the cavity. The hot air blowing section 32 blows out hot air having a smaller air volume than the inlet side on the exit side from the bending of the cavity molding surface 34, which is located below the apex of the bending of the cavity molding surface 34. . Since the end of the parison 31 on the die 14 side is fixed, the portion of the parison 31 on the entrance side to the bend matches the bend of the molding surface 34 of the cavity as compared to the exit side from the bend. Greater power is added to try to bend. This force can be countered by blowing hot air with a larger air volume at the inlet side. Thereby, it can reduce that the parison 31 contacts the molding surface 34 of the bending cavity. Moreover, since the temperature of the parison 31 that starts to bend can be maintained by blowing hot air with a larger air volume at the inlet side, the parison 31 can be easily bent, and the parison 31 is formed on the molding surface 34 of the bent cavity. It is possible to reduce contact.

  That is, the hot air blowing section 32 is closer to the cavity entrance than the apex compared to the hot air flow rate at a position farther from the cavity entrance than the apex of the cavity forming surface 34 in the direction in which the parison 31 is introduced. Blow out hot air with more airflow. Thereby, since it can reduce that the parison 31 contacts the shaping | molding surface 34 of the bending cavity, and since the temperature of the parison 31 which begins to bend can be maintained, the parison 31 becomes easy to bend, It is possible to reduce the contact of the parison 31 with the molding surface 34 of the bent cavity, so that a bent molded product can be more reliably molded.

  More preferably, the hot air blowing section 32 blows out hot air whose angle between the direction in which the parison 31 is introduced and the direction of the hot air is 90 degrees or more. That is, the hot air blowing section 32 blows hot air in a direction facing the direction in which the parison 31 is introduced at a predetermined angle. By doing so, force can be applied to the parison 31 in a direction away from the molding surface 34 of the bent cavity by the hot air in a direction against the flow of hot air from the hot air blowing section 23. It is possible to reduce the contact of the parison 31 with the surface 34.

  The pull-in portion 33 is connected to the suction portion 22 as indicated by an arrow G in FIG. 4, and the internal air is discharged by the suction portion 22. The drawing-in part 33 draws in the air in the cavity by the negative pressure of the suction part 22 as indicated by an arrow H in FIG. The lead-in part 33 is provided on the molding surface 34 on the outer side of the bend (the molding surface 34 on the side far from the center of the circle indicating the radius of curvature of the bend) that faces the molding surface 34 on which the hot air blowing section 32 is provided. It has been. In the example shown in FIG. 4, the pull-in portion 33 is provided on the outer molding surface 34 located on the left side in FIG. 1 among the molding surfaces 34 that bend from the top-down direction to the left-to-right direction. ing.

  More specifically, the pull-in portion 33 has a predetermined length upstream of the bending vertex of the cavity molding surface 34 out of the molding surface 34 inside the bent cavity, and the cavity molding surface. A predetermined length is formed downstream of the apex of the bent portion 34. More specifically, the pull-in portion 33 is linear in the direction in which the parison 31 is introduced, upstream of the bending vertex of the molding surface 34 of the cavity among the molding surfaces 34 inside the bent cavity. In addition, the length of the cavity is formed in a range of a straight line in the direction in which the parison 31 is introduced on the downstream side from the apex of the bending of the molding surface 34 of the cavity.

  The lead-in portion 33 is formed by forming a hole in a metal in a nozzle shape, or is formed of a porous material that is resistant to heat, such as sintered metal or ceramic. It can be said that the drawing-in part 33 forms a part of the molding surface 34 of the cavity, and forms one smooth surface together with the other molding surfaces 34.

  In addition, you may make it form the hot air blowing part 32 integrally with the shaping | molding die 11-2. Further, the pull-in portion 33 may be formed integrally with the mold 11-1.

  Thus, the parison 31 enters the cavity at the rear end without contacting the side surfaces of the cavities of the molds 11-1 and 11-2, that is, the molding surface 34.

  Thereafter, the lower end of the parison 31 is sealed by a lower end sealing portion (not shown) provided on the rear side of the mold 11-1. At this time, hot air blowing from the hot air blowing portion 23 and the hot air blowing portion 32 is stopped, and air drawing of the drawing portion 33 is also stopped.

  Next, the mold clamping units 17-1 and 17-2 move the sealing molds 15-1 and 15-2 to clamp the sealing molds 15-1 and 15-2. That is, the mold clamping unit 17-1 moves the sealing mold 15-1 to the right side, and the mold clamping unit 17-2 moves the sealing mold 15-2 to the left side to seal the sealing mold 15-1. The sealing molds 15-1 and 15- are combined so that the stopper and the sealing part of the sealing mold 15-2 are combined, and the molding surface of the sealing mold 15-1 and the molding surface of the sealing mold 15-2 are combined. 2 is clamped.

  FIG. 5 shows that the molds 11-1 and 11-2 are clamped, the sealing molds 15-1 and 15-2 are clamped, and the air valve 20 and the blow pin 18 are viewed from the section AA ′ in FIG. It is an enlarged top view which shows the state of the suction blow molding apparatus 1 moved to the front.

  On the right side surface of the sealing mold 15-1 and the left side surface of 15-2, there are provided cutouts 41-1 and 41-2 that are in contact with each other when closed. The biting 41-1 is an end portion of a molding surface for forming a cavity of the sealing die 15-1, and a curved end portion of a surface in contact with the sealing die 15-2 has a predetermined thickness. Now, it is formed in a shape extended to the sealing mold 15-2 side. Further, the biting 41-2 is an end portion of a molding surface for forming a cavity of the sealing die 15-2, and a curved end portion of a surface in contact with the sealing die 15-1 is predetermined. It is formed in a shape extended to the sealing mold 15-1 side with a thickness of.

  When the sealing molds 15-1 and 15-2 are clamped, that is, closed, a substantially hemispherical cavity is formed on the upper side. It is formed in a letter shape.

  It should be noted that the cutouts 41-1 and 41-2 are provided with holes for inserting the blow pins 18 into the cavities of the sealing molds 15-1 and 15-2.

  The guide 19 is positioned in the immediate vicinity of the bite cuts 41-1 and 41-2 without interfering with the sealing molds 15-1 and 15-2 to be clamped.

  In addition, sealing portions 42-1 and 42-2 are provided at the upper ends of the sealing dies 15-1 and 15-2, respectively, with the parison 31 pushed downward from the die 14 interposed therebetween. . For example, the sealing parts 42-1 and 42-2 are composed of a plurality of vertically long rectangular projections, and when the mold is clamped, the parison 31 is sandwiched between the projections.

  When the sealing dies 15-1 and 15-2 are clamped, the parison 31 is introduced from the die 14 into the cavities of the molding dies 11-1 and 11-2. -2 is sealed with the parison 31 pushed downward from the die 14 interposed therebetween.

  Next, the blow pin 18 is inserted into the parison 31 and air is blown into the parison 31 to form a molded product.

  The air cylinder 21 moves a built-in cylinder by air and pulls the rod. Thereby, the air cylinder 21 moves the air valve 20 and the blow pin 18 to the front side via the arm fixed to the rod. As a result, the blow pin 18 is guided from the hole of the guide 19 and sealed from the hole of the bite 41-1 and 41-2 so as to intersect the parting line of the sealing molds 15-1 and 15-2. Enter the cavities of the molds 15-1 and 15-2 and stab the parison 31.

  Since air which is air having a predetermined pressure is blown from the blow pin 18, the parison 31 is placed on the molding surfaces of the sealing dies 15-1 and 15-2 and the molding surfaces 34 of the molding dies 11-1 and 11-2. It swells along and a molded product is formed. Thereafter, the sealing dies 15-1 and 15-2 and the molding dies 11-1 and 11-2 are opened, and the molded product is taken out. In addition, the part shape | molded by the molding surface of the sealing molds 15-1 and 15-2 is a non-product part which is not used as a product. That is, in a post process, the part shape | molded by the shaping | molding surface of the sealing molds 15-1 and 15-2 is removed from a molded article.

  As described above, the hot air blowing section 23 is an inlet of the molds 11-1 and 11-2 that are clamped, and enters the cavity from the inlet where the parison 31 is inserted, and the parison 31 is introduced into the cavity. Blow hot air along the direction. Moreover, the hot air blowing part 32 is provided in the molding surface 34 inside the bending among the molding surfaces 34 of the cavity bent in the direction in which the parison 31 is introduced. The hot air blowing section 32 blows hot air in a direction intersecting the direction in which the parison 31 is introduced, with respect to the introduced parison 31. By doing in this way, it can reduce that the parison 31 contacts the shaping | molding surface 34 of the cavity bent in the direction in which the parison 31 is introduced, and can maintain the temperature of the parison 31 with hot air. As a result, a bent product can be more reliably formed.

  A hot air blowing portion that is an inlet of a mold that is clamped and that enters the cavity from the inlet where the parison 31 is placed and blows hot air along the direction in which the parison 31 is introduced into the cavity, 11-2 can also be provided. Hereinafter, the case where the hot air blowing part which blows out hot air along the direction where the parison 31 is introduced into the cavity is provided in the molds 11-1 and 11-2 will be described.

  FIG. 6 is a front view showing another example of the configuration of the suction blow molding apparatus 1. The same parts as those shown in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted as appropriate. The suction blow molding apparatus 1 shown in FIG. 6 includes molding dies 11-1 and 11-2, bases 12-1 and 12-2, mold clamping portions 13-1 and 13-2, a die 14, and a sealing die 15-. 1 and 15-2, bases 16-1 and 16-2, mold clamping units 17-1 and 17-2, blow pin 18, guide 19, air valve 20, air cylinder 21, suction unit 22, air blower 24, heating unit 25 The hot air blowing control unit 26 and the hot air blowing units 61-1 and 61-2 are configured.

  In the suction blow molding apparatus 1 shown in FIG. 6, the blower 24 blows air (sends air) to the heating unit 25, and the heating unit 25 heats the air sent from the blower 24 to form the mold 11. -2 hot air blowing section 32 and hot air blowing sections 61-1 and 61-2. The hot air blowing part 61-1 is provided in the molding die 11-1, and the hot air blowing part 61-2 is provided in the molding die 11-2. The hot air blowing portions 61-1 and 61-2 are formed in a substantially half donut shape, and when the molds 11-1 and 11-2 are clamped, they are integrally formed in a substantially donut shape. Yes. When the parison 31 is extruded from the die 14, the hot air blowing sections 61-1 and 61-2 are cavities from the entrances of the molds 11-1 and 11-2 that are clamped along the direction in which the parison 31 is extruded. Blow hot air inward.

  That is, the hot air blowing sections 61-1 and 61-2 are sent from the blower section 24, and the hot air heated in the heating section 25 is molded into molds 11-1 and 11-2 that are molds that are clamped. It is an inlet, and it blows out along the direction in which the parison 31 is introduced into the cavity from the inlet into which the parison 31 is inserted into the cavity. The outlets of the hot air outlets 61-1 and 61-2 are formed as hole-shaped nozzles, or are formed of a porous material that is resistant to heat, such as sintered metal or ceramic. Air blown from the blower 24 and heated by the heating unit 25 is blown out as hot air from the hot air blowing parts 61-1 and 61-2. The temperature of the hot air blown out from the hot air blowing portions 61-1 and 61-2 is set to a temperature within a range where the parison 31 can be formed.

  The hot air blowing portions 61-1 and 61-2 may be formed integrally with the molds 11-1 and 11-2, respectively.

  As described above, the hot air blowing portions 61-1 and 61-2 are inlets of the molding dies 11-1 and 11-2, which are molds that are clamped, and enter the cavity from the inlet where the parison 31 is placed. Opposite, hot air is blown out along the direction in which the parison 31 is introduced into the cavity.

  The hot air blowing sections 61-1 and 61-2 may be provided on the upper side of the molds 11-1 and 11-2, respectively. For example, the hot air blowing parts 61-1 and 61-2 may be formed integrally with the bases 16-1 and 16-2, respectively.

  As described above, the hot air blowing part 23 or the hot air blowing part 61-1 or 61-2 is the inlet of the molds 11-1 and 11-2 that are clamped, and the cavity from the inlet into which the parison 31 is placed. Inward, hot air is blown out along the direction in which the parison 31 is introduced into the cavity, and is provided on the molding surface 34 inside the bend among the molding surfaces 34 of the cavity bent in the direction in which the parison 31 is introduced. When the hot air blowing section 32 blows hot air in the direction intersecting the direction in which the parison 31 is introduced with respect to the introduced parison 31, the parison 31 forms the cavity molding surface 34. The temperature of the parison 31 can be maintained, and the bent product can be more reliably secured. It can form.

  When the hot air blowing part 23 is provided in the die 14 for molding the parison 31 and the hot air blowing part 23 blows the hot air heated by the heat of the die 14, the plastic molding material is melted to form a cylindrical parison. The air can be heated by using the heat of the die 14 that is at a high temperature in order to form 31, and there is no need to provide a separate heating device.

  Compared to the amount of hot air at a position farther from the inlet of the cavity than the apex of the bending of the molding surface 34 of the cavity in the direction in which the parison 31 is introduced into the hot air blowing section 32, the When a large amount of hot air is blown out, the portion of the parison 31 that is closer to the cavity entrance than the apex is located at the portion of the parison 31 that is closer to the cavity entrance than the apex. Since a greater force is applied to bend to the bend, this force can be countered with a larger amount of hot air, which causes the parison 31 to contact the forming surface 34 of the bent cavity. And the temperature of the parison 31 that begins to bend can be maintained. 31 is easily bent, it becomes possible to more reliably a molded article to be bent.

  When the hot air blowing section 32 or the hot air blowing section 61-1 or the hot air blowing section 61-1 or the hot air blowing section 61-1 or the hot air blowing section 61-1 or the hot air blowing section 32 is blown out. The hot air against the flow of hot air from 61-2 can apply force to the parison 31 in a direction away from the molding surface 34 of the bent cavity, so that the parison 31 contacts the molding surface 34. Can be less.

  When a drawing portion 33 that draws air is further provided on the outer molding surface 34 that faces the molding surface 34 provided with the hot air blowing portion 32, the molding surface of the cavity that is bent by the hot air Since the force is applied to the parison 31 in a direction away from the parison 34, the parison 31 can be less likely to come into contact with the molding surface 34, and the parison is pulled toward the molding surface 34 side outside the bend. It is possible to prevent the parison 34 from being crushed by a force from one direction.

  When the hot air blowing control unit 26 for controlling the air volume and temperature of the hot air blown from the hot air blowing unit 61-1 or 61-2 and the air volume and temperature of the hot air blown from the hot air blowing unit 32 is further provided, the parison 31 Since the amount and temperature of hot air can be controlled in accordance with the speed at which the parison 31 is introduced, the parison 31 can be made less in contact with the molding surface 34 of the cavity bent in the direction in which the parison 31 is introduced. The temperature of the parison 31 can be maintained by hot air, so that a bent product can be more reliably formed.

  The molding material has been described as a plastic such as nylon (trademark) 6 or nylon 6,6, but is not limited to this, and a thermoplastic such as a general-purpose plastic such as polyvinyl chloride, polypropylene, or polyethylene, or an engineering plastic. An elastomer can be used. Furthermore, a composite material reinforced with fibers such as glass fibers can be used as the molding material.

  The embodiments of the present invention are not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

1 Suction blow molding device, 11-1 and 11-2 mold, 12-1 and 12-2 base, 13-1 and 13-2 clamping part, 14 dies, 15-1 and 15-2 sealing mold, 16-1 and 16-2 base, 17-1 and 17-2 mold clamping part, 18 blow pin, 19 guide, 20 air valve, 21 air cylinder, 22 suction part, 23 hot air blowing part, 24 air blowing part, 25 heating part, 26 hot air blowing control unit, 31 parison, 32 hot air blowing unit, 33 pull-in unit, 34 molding surface, 41-1 and 41-2 biting, 42-1 and 42-2 sealing unit, 61-1 and 61-2 Hot air blowing part

Claims (6)

A first hot air blowing means that is an inlet of a mold that is clamped, and that blows hot air along a direction in which the parison is introduced into the cavity from the inlet into which the parison is placed;
Among the molding surfaces of the cavity bent in the direction in which the parison is introduced, provided in the molding surface inside the bending, the parison is introduced in a direction in which the parison has been introduced. And a second hot air blowing means for blowing hot air in a direction intersecting the suction blow molding device. In the suction blow molding device according to claim 1,
The first hot air blowing means is a suction blow molding device that is provided in a die for molding the parison and blows out hot air heated by the heat of the die. In the suction blow molding device according to claim 1,
The second hot air blowing means is configured such that the amount of hot air at a position farther from the inlet of the cavity than the vertex of bending of the molding surface of the cavity in the direction in which the parison is introduced is compared to the inlet of the cavity from the vertex. Suction blow molding device that blows out more hot air at a position close to. In the suction blow molding device according to claim 1,
The second hot air blowing means is a suction blow molding device that blows out hot air whose angle between the direction in which the parison is introduced and the direction of hot air is 90 degrees or more. In the suction blow molding device according to claim 1,
A suction blow molding apparatus, further comprising air drawing-in means provided on a molding surface on the outer side of the bend, facing a molding surface provided with the second hot air blowing means. In the suction blow molding device according to claim 1,
A suction blow molding apparatus further comprising a control means for controlling an air volume and temperature of hot air blown from the first hot air blowing means and an air volume and temperature of hot air blown from the second hot air blowing means.

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