JPH03159710A - Molding - Google Patents

Abstract

PURPOSE:To form slantly recessed grooves on the outer surfaces of side walls without complicating the construction of a mold by forming shallow wedge-shaped cross sectional recessed grooves consisting of slightly slant tapered surfaces and steeply slant surfaces in the case of forming recessed grooves extending slantly with respect to the mold releasing direction on the outer surfaces of the side walls of a molding. CONSTITUTION:For example, on the outer surfaces of left and right side walls in a case of opened at the upside, a plurality of recessed grooves 10 extending in the approximately intersecting direction to flange parts 7 are formed at every predetermined distance. The recessed grooves formed on the right side wall 4 extends only in respective slant of the angle of theta2 (for example, about 16 degrees) in rising forward with respect to the mold releasing direction H at the cross-sectional view and have shallow wedge-shaped cross sectional surfaces comprising slightly slant tapered surfaces 11 and steeply slant surfaces 12 to the outer surface of the wall and the tapered surfaces 11 are formed rearwardly and the surfaces 12 are formed forwardly. The outer surface of the right side wall slants at the draft of theta1 of the angle and the slightly slant tapered surface 11 has a draft of theta3 (for example, about 3 degrees) at the angle with respect to the mold releasing direction H. In this manner, since the sufficient draft can be ensured via the tapered surface 11, the lower mold can be released in the mold releasing direction H.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a molded product, and in particular, to a molded product formed using a mold, a molded product having a recess extending obliquely with respect to the mold release direction on the outer surface of the side wall portion of the molded product. It relates to something with grooves formed.

[Prior art]

Generally, as a molded product made of Hewei resin, for example, as shown in FIG. 7, a lower cover 10 of a tie writer made of Hewei resin is
1 is formed by injection molding or the like using l pairs of upper and lower molds.

Inside the lower cover 101, a pedestal 108 and ribs 109 for mounting a keyboard, various drive motors, etc. are integrally formed with the lower force bar l01 in a direction perpendicular (vertical) to the bottom wall 102. There is. These pedestals 1
A mold for molding 08 and ribs 109 is formed on the upper mold, and the mold release direction H when releasing the mold is perpendicular to the bottom wall 102, respectively. When molding, after closing the upper mold and the lower mold and molding the lower cover 101 with the groove 110 by injection molding, the lower mold is first released in the mold release direction H, and then the lower cover is molded. 101 is released from the upper mold in the mold release direction H using an eject bin. Here, in order to make it easier to release the upper and lower molds from the lower cover 10l, the front, rear, left and right side walls are slightly inclined outward with respect to the bottom wall 102 to create a draft angle. It is provided.

On the other hand, due to design reasons, when a plurality of grooves 110 having a rectangular cross section extending in the vertical direction are provided on the outer surface of the left and right side walls 104 of the lower cover 101, a mold for forming these grooves 110 is required. are formed on the lower mold, so each groove 110
Generally, the shape is parallel to the mold release direction H when viewed from the side.

[Problem to be solved by the invention]

By the way, from a design point of view, as shown in FIG.
It is desirable to provide the molding member in a direction substantially perpendicular to the upper end of the molding member, that is, to be inclined with respect to the mold release direction H when viewed from the side. However, when shaping such a groove l10, the cross section in the vertical plane parallel to the mold release direction H becomes as shown in Fig. 9, and when the lower mold is released, a part of the lower mold There are problems such as the lower mold cannot be released because it comes into contact with the lower cover 101, and the lower cover 101 may be partially damaged if the lower mold is forcibly released.

Here, it is conceivable to incorporate a movable mold that forms these grooves 110 into the lower mold, retract the movable mold after shaping the lower cover 101, and then release the lower mold, but the mold structure There are problems such as the process becomes complicated and mold precision is required, the forming device becomes complicated and expensive, and the cycle time for some forms of the lower cover 101 becomes very long.

An object of the present invention is to provide a molded product in which grooves are formed on the outer surface of the side wall portion, the grooves being inclined with respect to the mold release direction when viewed from the side, without complicating the mold structure.

[Means to solve the problem]

The molded product according to the present invention is a molded product made of metal or resin that is formed using a mold, and the molded product has a mold release mark on the outer surface of the side wall portion that is substantially parallel to the mold release direction of the molded product when viewed from the side. A groove with a shallow wedge-shaped cross section is formed, which extends obliquely with respect to the direction, and has a gently sloped taper surface and a steeply sloped surface with respect to the outer surface of the side wall portion, and the groove has a gently sloped shape. It is designed so that it can be released from the mold via the Taber surface.

[Effect]

In the molded product according to the present invention, the outer surface of the side wall portion of the molded product is approximately parallel to the mold release direction, that is, it is inclined with respect to the mold release direction at a predetermined draft angle.

The groove with a shallow wedge-shaped cross section formed on the outer surface of the side wall extends obliquely with respect to the mold release direction when viewed from the side, and has a gently inclined Taber surface and a steeply inclined surface with respect to the outer surface of the side wall. Moreover, since it is inclined toward the gently inclined Taber surface side, the mold can be released in the mold release direction via the draft of the side wall portion and the gently inclined Taper surface.

〔Effect of the invention〕

As explained above, according to the molded product of the present invention, the groove formed on the outer surface of the side wall portion that is substantially parallel to the mold release direction of the molded product is inclined with respect to the mold release direction when viewed from the side. Since it is formed in a shallow wedge-shaped cross section consisting of an elongated and gently inclined taper surface and a steeply inclined surface, even if the groove is inclined with respect to the mold release direction, it can be easily removed through the gently inclined taper surface. Can be reliably released from the mold.

Therefore, it is possible to form an inclined groove on the outer surface of the side wall portion, which is inexpensive and favorable in terms of design, without complicating the mold structure.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

This embodiment is a case where the present invention is applied to the lower cover of a tie writer.

As shown in Fig. 1, the lower cover 1 of the typewriter is made of resin and has a box shape with an open top, and has a bottom wall 2, a left wall 3, a right wall 4, and a front wall. 5 and a rear side wall 6, and a pedestal 8 and ribs 9 for attaching a keyboard (not shown) are integrally formed on the inner surface of the bottom wall 2 and each of the side walls 3, 4, 5, and 6. In addition, each side wall part 3, 4, 5, 6
A continuous flange 7 is formed at the upper end of the flange 7, and this flange 7 projects outward from each side wall 3, 4, 5, 6 by a predetermined distance. These pedestals 8 and ribs 9 are oriented perpendicularly to the bottom wall 2, that is, vertically. The mold for shaping these pedestal 8 and ribs 9 is formed into the upper mold. Here, when the lower cover 1 is molded by, for example, injection molding using a mold consisting of an upper mold and a lower mold, the mold release direction H is the vertical direction.

As shown in Fig. 2, the outer surfaces of the left and right side walls 3 and 4 are aligned with the vertical line A parallel to the mold release direction H so that the upper and lower molds can be easily released. Each of the draft angles is provided with a draft inclined upwardly by an angle θ1 (for example, about 6 degrees),
The front and rear side wall portions 5 and 6 are each provided with a draft inclined upwardly at a predetermined angle (for example, about 4 degrees) with respect to the vertical line A.

A plurality of grooves 1O extending in a direction substantially perpendicular to the flange 7 are formed on the outer surfaces of the pair of left and right side walls 3 and 4 at predetermined intervals.

As shown in FIGS. 1 to 4, the plurality of grooves 10 formed on the outer surface of the right side wall portion 4 extend forward at an angle θ2 (for example, about 16 degrees) with respect to the mold release direction H when viewed from the side. ), and has a shallow wedge-shaped cross section consisting of a tapered surface 11 that is gently sloped with respect to the outer surface of the right side wall portion 4 and a surface 12 that is steeply sloped. Then, the tapered surface 11 is arranged rearwardly and the surface 12 is arranged so that the groove 10 can be clearly seen when viewed from the front.
are formed facing forward. The width direction distance a of this gently inclined tapered surface 11 is about 21III1, and the width direction distance b of the steeply inclined surface 12 is about 0.4 mm.

During molding, the upper mold and the lower mold are closed and the lower cover 1 is shaped by injection molding, then the lower mold is released from the upper mold and the lower cover l, and then the upper mold is removed from the upper mold. The lower cover 1 will be released from the mold by ejecting, and the operation when releasing the lower mold will be described next.

As shown in FIGS. 4 and 5, the outer surface of the right side wall 4 has an angle θ
The gently inclined taper surface 11 is inclined with respect to the mold release direction H with a draft angle of 1, and as shown in FIGS. It is inclined with a draft angle of . In this way, a sufficient draft angle can be secured via the gently inclined tapered surface 11, so that the lower mold can be released in the mold irregularity direction H via the gently inclined tapered surface 11.

As explained above, the left and right side walls 3 and 3 of the lower cover 1
4 has a gently sloped tapered surface 11 and a steeply sloped surface 12 on its outer surface.
Since the concave groove lO having a shallow wedge-shaped cross section is formed to be inclined with respect to the mold release direction H when viewed from the side, the lower mold can be reliably released in the mold release direction H without complicating the mold. I can do it.

Furthermore, the mold release direction H is marked on the outer surfaces of the left and right side walls 3 and 4 when viewed from the side.
Since the concave groove 10 is formed to be inclined with respect to the flange portion 7 and substantially orthogonal to the flange portion 7 when viewed from the side, the design image of the lower cover 1 can be significantly improved.

In addition, since the steeply sloped surface 12 of the groove 10 is shaped to face forward, the groove lO clearly appears when viewed from the front, which improves the design effect of the groove ■O. will not be damaged.

It goes without saying that the present invention can be applied to various metal or synthetic resin molded products that are molded using metal molds.

[Brief explanation of the drawing]

Figures 1 to 6 show embodiments of the present invention, where Figure 1 is a perspective view of the lower cover, Figure 2 is a front view of the lower cover, and Figure 2 is a front view of the lower cover.
Figure 3 is a sectional view taken along the line ■-■ in Figure 1, Figure 4 is a partially enlarged side view of the lower cover, Figure 5 is a sectional view taken along the line V--V in Figure 4, and Figure 6 is a sectional view taken along the line V--V in Figure 4.
The figures are a sectional view taken along the line Vl-Vl in Fig. 4, Fig. 7 is a partial perspective view of a lower cover according to the prior art, and Fig. 8 is a partial side view of a molded product with orthogonal grooves provided at the upper end of the side wall. Figure 9 is the 8th
FIG. l...Lower cover 3, 4...Side wall part, 10...
Concave groove, l1...gently sloped taper surface, 12...steeply sloped surface.

Claims (1)

[Claims] (1) In a molded product made of metal or synthetic resin that is molded using a mold, the outer surface of the side wall portion that is approximately parallel to the mold release direction of the molded product is provided with a shape that is inclined with respect to the mold release direction when viewed from the side. A shallow wedge-shaped groove is formed on the outer surface of the side wall portion, and has a shallow wedge-shaped cross section and is formed of a gently sloped taper surface and a steeply sloped surface. A molded product characterized by being configured so that it can be molded.