JP3828569B1 - Mold for headlamp lens manufacturing - Google Patents

Abstract

In a mold for manufacturing a headlamp lens, a slide line generated in an undercut portion of the headlamp lens when the headlamp lens is manufactured is prevented from becoming thick.
In the mold 1 for manufacturing a headlamp lens, when the inner slide 9 moves from the forward movement position to the backward movement position, the nesting side inner slide contact surface 15 is separated from the inner slide side nesting contact surface 17 and in the backward movement position. A gap GP is formed between the nesting side inner slide contact surface 15 and the inner slide side nesting contact surface 17.
[Selection] Figure 1

Description

  The present invention relates to a mold for manufacturing a headlamp lens, and more particularly to a mold having an undercut portion.

  2. Description of the Related Art In recent years, a headlamp lens 200 having an undercut portion 202 for attachment on the vehicle fender side has been adopted due to diversification (for example, an increase in size) of headlamp designs for automobiles.

  FIG. 3 is a diagram illustrating a schematic configuration of the headlamp lens 200.

  The headlamp lens 200 is produced by injection molding a resin such as polycarbonate, and is a transparent cover-like member positioned in front of the headlamp when the headlamp is installed in an automobile (vehicle). Therefore, the headlamp light emitter and the reflecting mirror are located behind the headlamp lens 200.

  FIG. 4 is a diagram showing a schematic configuration of a conventional mold 100 for manufacturing the headlamp lens 200.

  The headlamp lens 200 shown in FIG. 4 is a III-III cross section of the headlamp lens shown in FIG.

  The conventional mold 100 includes, for example, a cavity 102, a master mold 104, a receiving plate 106, a spacer block 108, a movable side receiving plate 110, an ejector plate 112, and a guide pin 114, and processes an undercut portion 202. An internal slide structure is provided.

  That is, the conventional inner slide structure of the mold 100 includes a nest 115 provided on the mother die 104, an inner slide retainer 116 provided on the mother die 104, and an undercut portion 118. 116 is configured to include an inner slide 120 slidable between the inner slide 120 and an arrow 123 for engaging with the inner slide 120 and sliding the inner slide 120.

  The state shown in FIG. 4 shows a state in which the inner slide 120 is retracted and the cavity 102 is separated from the mother die 104 and the like. In this retreated and separated state, the headlamp lens 200 can be removed from the mold 100 without the undercut portion 202 of the headlamp lens 200 interfering with the undercut portion 118 of the inner slide 120.

  In the state shown in FIG. 4, the cavity 102 of the mold 100 is relatively moved upward in FIG. 4 to take out the headlamp lens 200 from the mold 100, and then the surface of the inner slide 120 (inside the headlamp lens 200 is inside). A surface that forms part) 122 and a surface of the nest 115 (surface that forms a part of the inside of the headlamp lens 200) 124 are continuous, and a surface of the inner slide 120 (a surface that contacts the matrix 104). The inner slide 120 is moved in the direction of the arrow AR10 until the 126 is in contact with the surface of the mother die 104 (the surface that is in contact with the inner slide 122) 128 (the inner slide 120 is moved to the advanced position by moving the arrow 123 and the like). In addition, the cavity 102 is moved relatively downward in FIG. 4 until it contacts the mother die 104. When injection molding is performed, a headlamp lens 200 is generated.

  After the generation of the headlamp lens 200, the inner slide 120 is retracted, the cavity 102 is relatively raised, the generated headlamp lens 200 is taken out from the mold 100, and is prepared for the next injection molding.

  By the way, in the conventional mold 100, the sliding surface 130 of the inner slide press 116 and the inner slide 120 and the sliding surface 132 of the inner slide 120 and the insert 115 are parallel to each other. Therefore, even if the inner slide 120 moves in the direction of the arrow AR10 in FIG. 4 or in the opposite direction, the sliding surfaces 130 and 132 are maintained.

In addition, as a literature regarding the metal mold | die provided with the undercut part, the nonpatent literature 1 can be hung, for example.
Mold on movable side slide core, [Search September 30, 2005], Internet <URL: http://www.geocities.jp/tukuba777/mold1a.html>

  By the way, in the conventional mold 100, the inner slide retainer 116 and the inner slide 120 are in contact with each other on the sliding surface 130 between the inner slide retainer 116 and the inner slide 120, but the inner slide 120 moves smoothly. Therefore, on the sliding surface 132 between the inner slide 120 and the insert 115, there is a slight clearance between the inner slide 120 and the mother die 104 even though they seem to be in contact with each other. ing.

  Therefore, when the headlamp lens 200 is molded, there is a problem that the slide line L1 (see FIGS. 3 and 4) is generated at the boundary between the inner slide 120 and the insert 115, and the slide line becomes thick. Thereby, there exists a possibility that design property may deteriorate.

  The present invention has been made in view of the above problems, and includes a mother die, a nest provided on the mother die, an inner slide press provided on the mother die, and an undercut portion. In a headlamp lens manufacturing mold having an inner slide that is freely slidable between the inner slide press and an arrow shape for sliding the inner slide, the headlamp lens is manufactured when the headlamp lens is manufactured. It is an object of the present invention to provide a mold for manufacturing a headlamp lens that can suppress a slide line generated in an undercut portion from becoming thick.

The invention according to claim 1 includes a mother die, a nest provided in the mother die, an inner slide retainer provided in the mother die, and an undercut portion between the insert and the inner slide retainer. In a mold for manufacturing a headlamp lens having an inner slide that is freely slidable and an arrow shape for sliding the inner slide,
In a state where the inner slide is present at the forward position to form the headlamp lens, the nesting and the inner slide are in surface contact with each other, and the surface of the nesting contacting the headlamp lens and the The inner slide surface that contacts the headlamp lens is continuously formed without a step,
The sliding surface crossing angle which is an acute crossing angle with respect to the mother die plane which is the plane of the mother die located on the opposite side of the nesting of the sliding surface between the inner slide press and the inner slide. However, when the headlamp lens is molded, the undercut portion slide contact surface, which is the surface of the undercut portion of the inner slide that contacts the undercut portion of the headlamp lens, has an acute angle with respect to the matrix plane. Is formed to be almost equal to or slightly smaller than the undercut portion crossing angle,
The nesting side inner slide contact surface, which is the surface of the inner slide that is in surface contact with the nesting, is formed so that the nesting side inner slide intersecting angle, which is an acute angle with respect to the master plane, is smaller than the sliding surface intersecting angle. And
In the retracted position of the inner slide, which is a position for taking out the headlamp lens formed by the mold from the mold, the inner sliding contact surface on the nesting side and a surface that is in surface contact with the inner slide of the nesting This is a mold for manufacturing a headlamp lens configured such that a gap is formed between the inner slide side nesting contact surface.

  According to the present invention, in the mold for manufacturing a headlamp lens, there is an effect that it is possible to suppress the slide line generated in the undercut portion of the headlamp lens from becoming thick when the headlamp lens is manufactured. .

  1 and 2 are diagrams showing a schematic configuration of a mold (mold for manufacturing a headlamp lens) 1 for manufacturing a headlamp lens 200 according to an embodiment of the present invention.

  The mold 1 is different from the conventional mold 100 in the engagement state between the insert 5 and the inner slide 9, and the other configuration is substantially the same as the conventional mold 100. The headlamp lens 200 shown in FIGS. 1 and 2 shows one section of the headlamp lens 200 formed in a three-dimensional shape, so that the headlamp lens 200 is, for example, the paper surface of FIG. It extends in a direction intersecting the paper surface while changing the crossing angle of.

Headlamp lens molds for manufacturing (referred hereinafter simply as "mold" is.) 1 includes a mold 3, a nest 5 provided on the mold 3, among which is provided on the matrix 3 slides A presser 7, an inner slide 9, and an arrow 11 for sliding the inner slide 9 are provided. The inner slide 9 includes an undercut portion 13 and is slidable between the insert 5 and the inner slide retainer 7 by an arrow 11 or the like.

  In the state where the inner slide 9 is present at the forward position (the state shown in FIG. 1; the state where the inner slide 9 is present at the position for forming the headlamp lens 200), the nesting 5 and the inner slide 9 are present. Are in surface contact with each other. That is, the nesting side inner slide contact surface 15 and the inner slide side nesting contact surface 17 are in surface contact with each other in a state where no gap exists.

  Further, the nesting surface 19 that contacts the headlamp lens 200 and the inner slide surface 21 that contacts the headlamp lens 200 are continuously formed without a step, and the undercut portion 13 of the inner slide 9 and the An undercut portion 202 of the headlamp lens 200 is formed between the mother die 3 facing the cut portion 13.

Further, the sliding surface crossing angle α shown in FIG. 1 is formed to be substantially equal to or slightly smaller than the undercut portion crossing angle β, and the nesting side inner slide crossing angle γ is greater than the sliding surface crossing angle α. Is also formed small .

  The sliding surface crossing angle α is an acute angle with respect to the mother die plane 25 which is the plane of the mother die 3 located on the side opposite to the insert 5 of the sliding surface 23 between the inner slide retainer 7 and the inner slide 9. Is the intersection angle. The undercut portion crossing angle β is the surface of the undercut portion slide contact surface 27 that is the surface of the undercut portion 13 of the inner slide 9 that contacts the undercut portion 202 of the headlamp lens 200 when the headlamp lens 200 is molded. This is an acute angle of intersection with the matrix plane 25. The nesting side inner slide intersecting angle γ is an acute angle of the surface of the inner slide 9 (nesting side inner sliding contact surface) 15 (inner slide side nesting contact surface 17) that is in surface contact with the nesting 5 with respect to the matrix plane 25. is there.

  Then, as shown in FIG. 2, a position for taking out the headlamp lens 200 molded from the mold 1 from the mold 1 (when the headlamp lens 200 molded from the mold 1 is taken out from the mold 1, In the retracted position of the inner slide 9, which is a position where the lamp lens 200 is prevented from being caught by the undercut portion 13 of the inner slide 9, the nesting side inner slide contact surface 15 which is a surface in contact with the nesting 5 of the inner slide 9. And a gap GP is formed between the inner slide side nest contact surface 17 that is in surface contact with the inner slide 9 of the nest 5.

  The relationship between the angles α, β, and γ in the cross section of the headlamp lens 200 that is separated from the paper surface in a direction intersecting the paper surface of FIGS. 1 and 2 (a cross section parallel to the paper surface) is shown in FIGS. 2 is the same as the relationship between the angles α, β, and γ.

  In the mold 1, a guide groove (not shown) for guiding the inner slide 9 when the inner slide 9 moves between the forward position and the backward position, and the inner slide 9 at the advanced position. A stopper (not shown) for stopping is provided on the mother die 3.

  The inner slide 9 is provided with a protruding portion 28 that engages with the guide groove and a contacted portion 29 that contacts the stopper. More specifically, as shown in FIG. 1, a rectangular parallelepiped protrusion 28 is integrally formed at both ends of the inner slide 9 on the inner slide retainer 7 side in the width direction (direction perpendicular to the paper surface of FIG. 1). The upper surface in the thickness direction, the lower surface in the thickness direction, and the end surface in the width direction of the projecting portion 28 are engaged with the guide groove, and the upper surface in the longitudinal direction of the projecting portion 28 is in contact with the stopper. A contact surface (contacted portion 29) is formed.

  Next, the operation of the mold 1 when molding the headlamp lens 200 will be described.

  First, as shown in FIG. 1, from the state in which the headlamp lens 200 is molded with the mold 1, the cavity 102 is moved relatively away from the mother mold 3 and the insert 5 and the inner slide 9. 2 is set in the state shown in FIG.

  The headlamp lens 200 molded in the state shown in FIG. 2 is removed from the mold 1, and then the cavity 102 is moved to the base 3 and the insert 5 and the inner slide 9 is moved to the advanced position. The headlamp lens 200 is injection-molded and is in the state shown in FIG.

  According to the mold 1, the angles α and γ of the sliding surface and the like are appropriately set as described above, so that when the inner slide 9 is in the forward movement position, the nesting 5 and the inner slide 9 are A surface 19 of the insert 5 that is in surface contact with the headlamp lens 200 and a surface 21 of the inner slide 9 that is in contact with the headlamp lens 200 are formed continuously without a step. Further, in the state where the inner slide 9 is in the retracted position, a gap GP is formed between the inner slide 9 and the insert 5, so that the slide is inserted between the insert and the inner slide as in the conventional mold 100. Even if there is no clearance for movement, the inner slide can move smoothly with respect to the nesting and the inner slide presser. Further, when the headlamp lens 200 is molded, it occurs in the undercut portion 202 of the headlamp lens 200. It is possible to suppress the slide line L1 to be thickened. And the design property of the headlamp lens 200 can be improved.

  Further, in a state where the inner slide 9 exists in the retracted position, a certain amount of gap (for example, a gap having a width of about 7 mm) GP is formed between the inner slide 9 and the insert 5. During maintenance of the mold 1, cleaning between the inner slide 9 and the insert 5 can be performed without disassembling the mold 1, and maintenance of the mold 1 is facilitated. By facilitating maintenance, the productivity of the headlamp lens 200 can be increased and the occurrence of defects can be suppressed.

  Further, in the conventional mold 100, grease is injected into the sliding surface between the insert and the inner slide in order to move the inner slide smoothly. It oozes out at L1, and there is a possibility that a defect may occur although it is very rare. However, in the metal mold | die 1 which concerns on embodiment of this invention, since grease is unnecessary, generation | occurrence | production of this defect can be eliminated.

  Further, according to the mold 1, the guide groove and the stopper are provided in the mother die, so that the inner slide 9 can be accurately adjusted even if the headlamp lens 200 (inner slide 9) is formed in a three-dimensional complicated shape. Therefore, the headlamp lens 200 having an accurate shape can be easily manufactured.

  The mold 1 includes a mother die, a nest provided on the mother die, an inner slide retainer provided on the mother die, and an undercut portion between the insert and the inner slide retainer. In a mold for manufacturing a headlamp lens having a slidable inner slide and an arrow shape for sliding the inner slide, the inner slide is present at a forward position to form the headlamp lens Then, the nest and the inner slide are in surface contact with each other, and the surface of the nest that contacts the headlamp lens and the surface of the inner slide that contacts the headlamp lens are continuously formed without a step. Between the undercut portion of the inner slide and the matrix opposite to the undercut portion. A darcut portion is formed, and the headlamp lens molded by the mold is removed from the mold at a position for removing the headlamp lens molded by the mold. The headlamp lens is formed when the inner slide moves in parallel from the forward position to a retracted position, which is a position that prevents the headlamp lens from being caught by the undercut portion of the inner slide when being taken out from An undercut headlamp lens contact surface that is a surface of the undercut portion of the headlamp lens that contacts the undercut portion of the inner slide, and the inner slide that contacts the undercut portion headlamp lens contact surface. The undercut portion sliding contact surface that is the surface of the undercut portion Or when the inner slide moves in parallel so that they are slightly separated from each other, and the inner slide moves from the advance position to the retract position, the nesting side is a surface that comes into surface contact with the nesting of the inner slide. The inner slide contact surface is gradually separated from the inner slide side nesting contact surface which is a surface contacting the inner slide of the nesting, and in the retracted position, the nesting side inner slide contact surface and the inner slide side nesting contact surface This is an example of a mold for manufacturing a headlamp lens that is configured such that a gap is formed therebetween.

It is a figure which shows schematic structure of the metal mold | die for manufacturing the headlamp lens which concerns on embodiment of this invention. It is a figure which shows schematic structure of the metal mold | die for manufacturing the headlamp lens which concerns on embodiment of this invention. It is a figure which shows schematic structure of a headlamp lens. It is a figure which shows schematic structure of the conventional metal mold | die for manufacturing a headlamp lens.

Explanation of symbols

1 Mold 3 Master 5 Nest 7 Inner slide retainer 9 Inner slide 11 Arrow 13 Undercut part 15 Nest side inner slide contact surface 17 Inner slide side inner contact surface α Sliding surface cross angle γ Nest side inner slide cross angle

Claims (1)

A mother die, a nest provided in the mother die, an inner slide retainer provided in the mother die, an inner slide having an undercut portion and slidable between the insert and the inner slide retainer, and In a mold for manufacturing a headlamp lens having an arrow shape for sliding an inner slide,
In a state where the inner slide is present at the forward position to form the headlamp lens, the nesting and the inner slide are in surface contact with each other, and the surface of the nesting contacting the headlamp lens and the The inner slide surface that contacts the headlamp lens is continuously formed without a step,
The sliding surface crossing angle which is an acute crossing angle with respect to the mother die plane which is the plane of the mother die located on the opposite side of the nesting of the sliding surface between the inner slide press and the inner slide. However, when the headlamp lens is molded, the undercut portion slide contact surface, which is the surface of the undercut portion of the inner slide that contacts the undercut portion of the headlamp lens, has an acute angle with respect to the matrix plane. Is formed to be almost equal to or slightly smaller than the undercut portion crossing angle,
The nesting side inner slide contact surface, which is the surface of the inner slide that is in surface contact with the nesting, is formed so that the nesting side inner slide intersecting angle, which is an acute angle with respect to the master plane, is smaller than the sliding surface intersecting angle. And
In the retracted position of the inner slide, which is a position for taking out the headlamp lens formed by the mold from the mold, the inner sliding contact surface on the nesting side and a surface that is in surface contact with the inner slide of the nesting A mold for manufacturing a headlamp lens, wherein a gap is formed between the inner slide side nesting contact surface.

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