JP5422307B2 - Two-color injection molding method for resin windows - Google Patents

Description

  In the present invention, after injection-molding a translucent substantially rectangular plate-shaped resin panel having a substantially rectangular annular peripheral wall portion protruding toward the back surface at the periphery, the above peripheral wall portion is formed on the back surface side of the resin panel from the inside. The present invention relates to a two-color injection molding method for obtaining a resin-made window by injection-molding a non-translucent frame portion in a substantially rectangular shape along the peripheral wall portion so as to come into contact therewith.

  Patent Document 1 includes a translucent substantially rectangular plate-shaped resin panel, and a non-transparent frame portion formed in a substantially rectangular ring shape along the periphery of the resin panel on the back side of the resin panel. A two-color injection molding method for molding a provided resin window is disclosed. In this molding method, a first cavity is formed by a fixed mold in which a recess corresponding to the frame portion is formed and a first movable mold having a flat molding surface, and an opaque resin is formed in the first cavity. The frame is molded by injection filling. Thereafter, a second cavity is formed by the second movable mold in which the recess corresponding to the resin panel is formed, the fixed mold and the frame portion held by the fixed mold, and the translucent property is formed in the second cavity. Resin is injected and filled to form a resin panel. The resin is injected into the second cavity from a gate formed on the molding surface of the second movable mold corresponding to the end surface of the resin panel.

JP 2009-6533 A

  However, in the above-mentioned Patent Document 1, a gate mark is formed on the end face of the resin panel and exposed to the outside, so that it does not look good.

  Therefore, if the gate for injecting the translucent resin for molding the resin panel is provided at the location corresponding to the frame so that the resin panel is injection molded before the frame, the gate mark is hidden by the frame. The appearance is improved. However, in this method, when forming a peripheral wall portion that protrudes toward the back side on the periphery of the resin panel, the resin panel shrinks and the molding surface of the mold corresponding to the outer surface of the peripheral wall portion There is a possibility that a gap is formed between the two, and the peripheral wall portion is inclined toward the gap due to the injection pressure of the light-impermeable resin corresponding to the frame portion, causing distortion in the shape of the resin panel periphery.

  This invention is made | formed in view of this point, and there exists in shape | molding the resin-made window with a smooth periphery shape finely.

  In order to achieve the above object, the present invention is characterized in that a frame portion is formed by inserting a protrusion into a gap formed between a resin panel and a mold by shrinkage of the resin panel. To do.

  Specifically, in the present invention, after injection-molding a light-transmitting substantially rectangular plate-shaped resin panel having a substantially rectangular annular peripheral wall portion protruding toward the back surface at the periphery, the above-mentioned surface is formed on the back surface side of the resin panel. A two-color injection molding method for obtaining a resin window by injection molding a non-transparent frame portion in a substantially rectangular ring shape along the peripheral wall portion so as to be in contact with the peripheral wall portion from the inside. Took.

  That is, the invention described in claim 1 has a molding surface for molding the surface and end surface of the resin panel, and the positioning pin protrudes at the longitudinal center position of the molding surface corresponding to one side of the end surface of the resin panel. A cavity mold provided so as to be dipped, and a first core mold having a molding surface for molding the back surface and the inner surface of the peripheral wall portion of the resin panel, and having a gate formed at a location corresponding to the frame portion of the molding surface; The cavity mold and the first core mold are clamped to form a first cavity therebetween, and the positioning pin protrudes from the molding surface into the first cavity. In this state, the first cavity A primary injection molding step of forming a substantially rectangular plate-shaped resin panel by injecting and filling a translucent resin from the gate of the first core mold, and opening the cavity mold and the first core mold; Positioning pin above Inserting into the oil panel from its end face, shrinking it while supporting the resin panel from below and holding it in the cavity mold, molding the three sides except the support side edge by the positioning pins on the end face of the resin panel A resin panel shrinking step that creates a gap with the surface, a contact surface that is in contact with the back surface of the resin panel inside the frame portion, and a molding surface that molds the back side of the frame portion. A second core mold having corresponding protrusions formed thereon is prepared, and the cavity mold and the second core mold are clamped to bring the abutting surface into contact with the back surface of the resin panel held by the cavity mold. In addition, the protruding portion is inserted into the gap to form a second cavity between the inner side of the peripheral wall of the resin panel and the second core mold, and in this state, the opaque resin is formed in the second cavity. Injection-filling the opaque frame And a secondary injection molding process to form.

  According to a second aspect of the present invention, in the two-color injection molding method for a resin window according to the first aspect, the resin panel is compression-molded in the primary injection molding step.

  According to a third aspect of the present invention, there is provided the resin window two-color injection molding method according to the first or second aspect, wherein the auxiliary positioning pin is provided at the center position in the longitudinal direction of the molding surface of the cavity mold facing the positioning pin. Is provided so as to be able to project and retract, and in the primary injection molding step, the translucent resin is injected and filled in a state where the auxiliary positioning pins are further projected from the molding surface.

  According to a fourth aspect of the present invention, in the two-color injection molding method for a resin window according to any one of the first to third aspects, the positioning pin has a protruding length at a position corresponding to the peripheral wall portion. In the secondary injection molding step, the positioning pin is retracted from the resin panel and the positioning pin is injected and filled with the non-translucent resin. The resin is spread over the through holes formed in the peripheral wall portion by retreating.

  According to the first aspect of the present invention, the first core type gate is formed at a position corresponding to the frame portion, and the gate trace of the resin panel is concealed by the frame portion, so that the appearance is improved.

  Moreover, since the protrusion part of the second core mold is inserted into the gap between the peripheral wall part and the molding surface of the cavity mold, the inclination of the peripheral wall part to the outside due to the injection pressure of the resin into the second cavity is prevented. And the shape of the resin panel periphery can be made smooth.

  Further, since the resin panel is positioned by the positioning pin at the longitudinal center position of one side of the end face and contracted with one side of the end face in contact with the mold, the remaining three sides and the molding surface of the cavity mold A gap is formed between them with a predetermined width. Therefore, by setting the width of the protrusion of the second core type equal to the width of the gap in advance, it is possible to reliably prevent the outer wall from inclining to the outside due to the injection of the resin into the second cavity. The shape of the peripheral edge can be surely smoothed.

  According to the invention described in claim 2, since the resin panel is compression-molded, the occurrence of distortion on the panel surface can be prevented.

  According to the invention described in claim 3, since the resin panel is supported from above and below by the positioning pins and the auxiliary positioning pins, the cavity mold and the second core mold are opened after the cavity mold and the first core mold are opened. It is possible to prevent the resin panel from dropping from the cavity mold until the mold is clamped.

  According to invention of Claim 4, since the through-hole corresponding to a positioning pin is block | closed with resin and the opening is not exposed, appearance improves.

It is a perspective view of the resin-made windows injection-molded by the shaping | molding method which concerns on embodiment of this invention. It is a shaping | molding process figure which shows the process of inject | pouring translucent resin in a 1st cavity in the shaping | molding method which concerns on embodiment of this invention. It is a shaping | molding process figure which shows the process of compression-molding a resin panel in the shaping | molding method which concerns on embodiment of this invention. It is a shaping | molding process figure which shows the process of opening a cavity type | mold and a 1st core type | mold in the shaping | molding method which concerns on embodiment of this invention. It is a front view of the cavity type | mold corresponding to FIG. It is a shaping | molding process figure which shows the process of rotating a cavity type | mold in the state which hold | maintained the resin panel in the cavity type | mold in the shaping | molding method which concerns on embodiment of this invention. It is a front view of the cavity type | mold corresponding to FIG. In the molding method according to the embodiment of the present invention, a molding process diagram showing a state in which the process of clamping the cavity mold and the second core mold and the process of injecting the translucent resin into the first cavity proceed simultaneously. It is. In the shaping | molding method which concerns on embodiment of this invention, it is a shaping | molding process figure which shows the state which advanced simultaneously the process of injecting opaque resin in the 2nd cavity, and the process of compression-molding a resin panel. In the molding method according to the embodiment of the present invention, a molding process diagram showing a state in which the process of opening the cavity mold and the second core mold and the process of opening the cavity mold and the first core mold are performed simultaneously. It is.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a resin window 1 attached to a window opening formed on the ceiling of a vehicle so as to close the opening. In order to obtain the resin window 1, first, a light-transmitting substantially rectangular plate-like resin panel 5 having a substantially rectangular annular peripheral wall portion 3 protruding toward the back surface is formed by injection molding. Thereafter, a non-translucent frame portion 7 is injection-molded in a substantially rectangular ring shape along the peripheral wall portion 3 so as to be in contact with the peripheral wall portion 3 from the inside on the back surface side of the resin panel 5.

  2 to 10 show a two-color injection molding method of the resin window 1 according to the embodiment of the present invention. For molding the resin window 1, a cavity mold (fixed mold) 9, a first core mold (movable mold) 11, and a second core mold (movable mold) 13 are used. Before explaining a specific molding method, these mold structures will be explained.

  The cavity mold 9 has a molding surface 16 having the same shape extending in the vertical direction on both side surfaces. The cavity mold 9 is supported from above and below by a cavity rotating shaft 15 extending in the vertical direction, and is rotated by driving by a driving device (not shown). Further, as shown in FIGS. 5 and 7, on both sides of the cavity mold 9, there are not shown rotation restricting pins 14 that contact the vertical surface of the cavity mold 9 and restrict the rotation around the cavity rotation shaft 15. It is provided to be able to advance and retreat by driving by the driving means.

  Each molding surface 16 of the cavity mold 9 is for molding the surface and end surface of the resin panel 5. In addition, one fluid pressure cylinder 18 corresponding to each molding surface 16 is disposed at the center in the horizontal direction below the cavity mold 9. On the inner side (molding surface) side of each fluid pressure cylinder 18, the positioning pin 17 is a molding surface corresponding to one side (one side on the lower side of FIGS. 5 and 7) of the end surface of the resin panel 5 of the cavity mold 9. It is arranged so as to be able to project and retract at the center position in the longitudinal direction of 16a.

  In addition, one fluid pressure cylinder 20 is disposed at the center in the horizontal direction above the cavity mold 9 corresponding to each molding surface 16. On the inner side (molding surface) side of each fluid pressure cylinder 20, the auxiliary positioning pin 19 protrudes and retracts at the longitudinal center position corresponding to the peripheral wall portion 3 on the molding surface 16 b of the cavity mold 9 facing the positioning pin 17. It is arranged to be possible. The protruding lengths of the positioning pins 17 and the auxiliary positioning pins 19 are set to be equal to or greater than the thickness of the peripheral wall 3.

  The first core mold 11 has a molding surface 21 for molding the back surface of the resin panel 5 and the inner surface of the peripheral wall 3. A gate 23 is formed at a location corresponding to the frame portion 7 on the molding surface of the first core mold 11. The gate 23 is formed at one end of a runner 29, the other end of the runner 29 communicates with one end of a sprue 31, and the other end of the sprue 31 communicates with a nozzle 33 of an injection machine (not shown).

  The second core mold 13 has a contact surface 26 that contacts the back surface of the resin panel 5 inside the frame portion 7 and a molding surface 25 that molds the back surface side of the frame portion 7. A protrusion 27 corresponding to a gap S (described later) between the resin panel 5 and the forming surface 16 of the cavity mold 9 is provided on the forming surface 25. A gate 35 is formed on the molding surface 25. The gate 35 is formed at one end of a runner 37. The other end of the runner 37 communicates with one end of a sprue 39. The other end of the sprue 39 is an injection machine ( It communicates with a nozzle 41 (not shown).

  Next, the two-color injection molding method according to this embodiment will be described. Here, as shown in FIG. 2, the cavity mold 9 and the first core mold 11 are clamped to form the first cavity 43, and the cavity mold 9 and the second core mold 13 are clamped. The process shall be started. In the state of FIG. 2, the positioning pin 17 and the auxiliary positioning pin 19 on the first core mold 11 side both protrude from the molding surface 16 and advance into the first cavity 43 by the extension operation of the fluid pressure cylinders 18 and 20. However, the positioning pin 17 and the auxiliary positioning pin 19 on the second core mold 13 side do not protrude from the molding surface 16. Further, the cavity mold 9 is pressed from both sides by the rotation restricting pins 14 to restrict the rotation. In this state, first, the translucent resin 45 is injected from the nozzle 33 of the injection machine, so that the translucent resin 45 is injected and filled into the first cavity 43 from the gate 23 through the sprue 31 and the runner 29. As the translucent resin 45, PC (polycarbonate), PMMA (acrylic), or the like can be used.

  Next, as shown in FIG. 3, the first core mold 11 is brought closer to the cavity mold 9. Thereby, as shown in FIG.4 and FIG.5, the substantially rectangular plate-shaped resin panel 5 which has the substantially rectangular cyclic | annular surrounding wall part 3 in an outer periphery is compression-molded. By compressing the resin panel 5 in this way, it is possible to prevent the occurrence of distortion on the panel surface.

  Then, as shown in FIG. 4, the first core mold 11 is retracted to open the cavity mold 9 and the first core mold 11, and at the same time, the second core mold 13 is retracted to prepare for the next step. . In this state, as shown in FIG. 5, the end surface of the resin panel 5 and the molding surface 16 of the cavity mold 9 are in contact with each other. Then, the positioning pins 17 and the auxiliary positioning pins 19 are inserted into the resin panel 5 from their end faces, and the resin panel 5 is supported from above and below and is contracted in a state where it is held by the cavity mold 9. The resin panel 5 contracts in the left-right direction in FIG. 7 with respect to the positioning pin 17, and contracts in the vertical direction with reference to the lower molding surface 16 a provided with the positioning pin 17 by gravity.

  When the resin panel 5 contracts, the rotation restricting pin 14 is retracted, and then, as shown in FIG. 6, the cavity die 9 is rotated 180 degrees around the cavity rotating shaft 15 by a driving device (not shown), and the rotation restricting pin 14 is advanced. The rotation of the cavity mold 9 is restricted. At this time, since the resin panel 5 is supported from above and below by the positioning pins 17 and the auxiliary positioning pins 19, dropping from the cavity mold 9 is prevented. In this state, as shown in FIGS. 6 and 7, due to the shrinkage of the resin panel 5, between the three sides excluding the side on the support side by the positioning pins 17 on the end surface of the resin panel 5 and the molding surface 16 of the cavity mold 9. There is a gap S.

  Next, as shown in FIG. 8, the positioning pin 17 and the auxiliary positioning pin 19 are retracted by the contraction operation of the fluid pressure cylinders 18 and 20 on the second core mold 13 side. Thereby, a through hole 51 corresponding to the positioning pin 17 and a through hole 53 corresponding to the auxiliary positioning pin 19 are formed in the peripheral wall portion 3. Thereafter, the second core mold 13 is advanced to clamp the cavity mold 9 and the second core mold 13 so that the contact surface 26 of the second core mold 13 is placed on the back surface of the resin panel 5 held by the cavity mold 9. The protrusion 27 is inserted into the gap S while being brought into contact. Thereby, a second cavity 47 is formed between the inner side of the peripheral wall 3 of the resin panel 5 and the second core mold 13. Further, in this process, the first core mold 11 is advanced, the cavity mold 9 and the first core mold 11 are clamped to form the first cavity 43, and the positioning pins 17 on the first core mold 11 side and the auxiliary The positioning pin 19 is advanced into the first cavity 43 by the extension operation of the fluid pressure cylinders 18 and 20. In this state, the translucent resin 45 is injected and filled into the first cavity 43 from the gate 23 in the manner described with reference to FIG.

  Next, as shown in FIG. 9, by injecting the opaque resin 49 from the nozzle 41 of the injection machine, the opaque resin 49 passes through the sprue 39 and the runner 37 from the gate 35 into the second cavity 47. The light-impermeable resin 49 is spread over the through holes 51 and 53 by injection filling. At this time, since the protrusion 27 of the second core mold 13 is inserted into the gap S, the inclination of the peripheral wall 3 to the outside due to the injection pressure of the opaque resin 49 into the second cavity 47 is prevented. Thus, the shape of the periphery of the resin panel 5 becomes smooth. As the light-impermeable resin 49, PC (polycarbonate), PET (polyethylene terephthalate), PBT (polybutylene terephthalate), PC / ABS alloy (polycarbonate / acrylonitrile / butadiene / styrene) or the like can be used. Further, in this process, as described with reference to FIG. 3, on the first core mold 11 side, the transparent resin 45 is filled in the first cavity 43, and the first core mold 11 is attached to the cavity mold 9. To make it closer.

  A resin window in which the opaque resin 49 is completely solidified on the second core mold 13 side and the opaque frame portion 7 is integrally formed along the peripheral wall portion 3 on the back surface side of the resin panel 5. 1 is molded. Thereafter, as shown in FIG. 10, the second core mold 13 is moved backward to open the cavity mold 9 and the second core mold 13, and the resin window 1 is taken out. On the other hand, on the first core mold 11 side, the cavity mold 9 and the first core mold 11 are opened by retracting the first core mold 11 as described with reference to FIG.

  By repeating the above-described steps, the resin window 1 can be continuously formed on both side surfaces of the cavity mold 9.

  Therefore, according to the present embodiment, the gate 23 of the first core mold 11 is formed at a location corresponding to the frame portion 7, and the gate trace of the resin panel 5 is concealed by the frame portion 7, so that the appearance is improved.

  Further, since the resin panel 5 is positioned by the positioning pin 17 at the longitudinal center position of one side of the end face and contracted in a state where one side of the end face is in contact with the mold, molding of the remaining three sides and the cavity mold 9 is performed. A gap S is formed between the surface 16 and a predetermined width. Therefore, by setting the width of the protruding portion 27 of the second core mold 13 equal to the width of the gap S in advance, the outer side of the peripheral wall portion 3 by the injection of the light-impermeable resin 49 into the second cavity 47 is set. Can be reliably prevented, and the shape of the periphery of the resin panel 5 can be surely smoothed.

  Further, since the through holes 51 and 53 corresponding to the positioning pins 17 and the auxiliary positioning pins 19 are blocked by the opaque resin 49 and the openings are not exposed, the appearance is improved.

  The present invention, for example, after injection-molding a translucent substantially rectangular plate-shaped resin panel having a substantially rectangular annular peripheral wall portion protruding toward the back surface at the periphery, and then forming the peripheral wall portion on the back surface side of the resin panel It is useful as a two-color injection molding method for obtaining a resin-made window by injection molding a non-translucent frame portion along the peripheral wall portion so as to contact from the inside in a substantially rectangular ring shape.

1 Resin window
3 Perimeter wall
5 Resin panels
7 Frame
9 Cavity type
11 First core type
13 Second core type
16, 16a, 16b Molded surface
17 Positioning pin
19 Auxiliary positioning pin
21 Molding surface
23 Gate
25 Molding surface
26 Abutting surface 27 Projection
43 1st cavity
45 Translucent resin
47 Second cavity
49 opaque resin
51 Through hole
S clearance

Claims (4)

After injection-molding a light-transmitting substantially rectangular plate-shaped resin panel having a substantially rectangular annular peripheral wall portion protruding toward the back surface at the periphery, the back surface side of the resin panel is in contact with the peripheral wall portion from the inside. A two-color injection molding method for obtaining a resin-made window by injection-molding a non-translucent frame portion into a substantially rectangular annular shape along a peripheral wall portion,
A cavity mold having a molding surface for molding the surface and end face of the resin panel, and a positioning pin that can be projected and retracted at a longitudinal center position of the molding surface corresponding to one side of the end face of the resin panel; A first core mold having a molding surface for molding the back surface of the resin panel and the inner surface of the peripheral wall portion and having a gate formed at a location corresponding to the frame portion of the molding surface is prepared. The mold is clamped to form a first cavity therebetween, and the positioning pin protrudes from the molding surface into the first cavity. In this state, the translucent resin is placed in the first cavity. A primary injection molding process in which a resin panel having a substantially rectangular plate shape is molded by injection filling from a mold gate;
The cavity mold and the first core mold are opened, the positioning pins are inserted into the resin panel from the end surfaces thereof, the resin panel is supported from below and contracted in a state of being held in the cavity mold, and the resin panel A resin panel shrinking step for generating a gap between the three sides excluding the side on the support side by the positioning pins on the end surface of the mold and the molding surface of the cavity mold,
A second core mold having a contact surface that contacts the back surface of the resin panel on the inner side of the frame portion and a molding surface for forming the back surface side of the frame portion and having a ridge portion corresponding to the gap is prepared. The cavity mold and the second core mold are clamped so that the abutment surface abuts on the back surface of the resin panel held by the cavity mold, and the protrusions are inserted into the gaps. A second cavity is formed between the inside of the peripheral wall portion and the second core mold, and in this state, a light-impermeable resin is injected and filled into the second cavity to form a light-impermeable frame portion. A two-color injection molding method for a resin window having a secondary injection molding step. In the two-color injection molding method of the resin window according to claim 1,
In the primary injection molding step, the resin panel is compression-molded, and the resin window two-color injection molding method is characterized. In the two-color injection molding method of the resin-made window according to claim 1 or 2,
An auxiliary positioning pin is provided so as to protrude and retract at the center position in the longitudinal direction of the molding surface of the cavity mold facing the positioning pin,
In the primary injection molding step, injection filling of the translucent resin is performed in a state where the auxiliary positioning pins are further projected from the molding surface. In the two-color injection molding method for a resin window according to any one of claims 1 to 3,
The positioning pin is provided at a position corresponding to the peripheral wall portion so that the protruding length is equal to or greater than the thickness of the peripheral wall portion,
In the secondary injection molding process, the positioning pin is retracted from the resin panel, and when the opaque resin is injected and filled, the positioning pin is retracted to the through hole formed in the peripheral wall portion. A two-color injection molding method for a resin window, characterized in that

Images