JPS61248728A - Method and device for molding hollow body with protrusion and recess - Google Patents

Abstract

PURPOSE:To improve the efficiency of production by mass-production by a method wherein the molding is effected by assembling and separating split movable molds which are provided with protrusions for molding on the circumferences thereof. CONSTITUTION:Upon the movement of a slide main body 14, a rear segment 19 is moved together under being tilted into the direction of a principal shaft 8 at first and second slider 10 is moved rearward by the pushing force of the slide main body 14, then, the principal shaft 8 is pulled simultaneously and a front segment 25 moves together with the shaft. The front segment 25 is fitted to the rear segment 19 and is integrated upon molding, however, when respective rear segments 19 are tilted toward the principal shaft 8, neighboring segments, supporting respective front segments 25, are dropped and, therefore, rear segments 19 are tilted naturally about the pivotal sections 26 thereof toward the principal shaft 8.

Description

DETAILED DESCRIPTION OF THE INVENTION 1. Object of the Invention The present invention relates to a molding method and a molding apparatus for a hollow body with unevenness manufactured by synthetic resin molding.

Conventionally, for example, a method of manufacturing a pipe joint with an undercut involves heating a straight PVC pipe and deforming the heated portion into a predetermined shape.

There was a method of constructing the product by cutting or gluing at predetermined parts after molding, but this method did not increase production efficiency and made it impossible to mass produce, which was a technical issue in the industry.

Therefore, the object of the present invention is to provide an innovative molding method that eliminates the various drawbacks of conventional manufacturing methods, and to reduce production costs through mass production.

2. Structure of the Invention The structure and operation of the present invention will be explained based on one embodiment of the drawings.

(1) is a fixed mold with a planar T-shape installed on the fuselage.
This fixed mold has vertical part (2) and left and right horizontal parts (3) (3)
Concave portions f41+41 for undercut formation are provided at appropriate positions on the left and right horizontal portions.

(5) is a vertical slide core placed in the vertical part (2) of the fixed mold (1), and this mold part is used to mold the valve-side joint part of the pipe. (6) is this vertical slide core (5)
A circular on-off valve is installed inside this tip, and the tip surfaces of horizontal slide cores f71+71, which will be described later, come into contact with and separate from the left and right peripheral surfaces of this tip.

(71+71 is the left and right horizontal part f31 of the fixed mold (1)
+31 is a horizontal slide core disposed at a position where the tip end touches the vertical slide core (5), and the horizontal portion f31 +31 is located on the rear side of this horizontal slide core.
The front end of the main shaft (8) arranged in the longitudinal direction is fixed (9).

Around the rear end of this horizontal slide core (7), a space step part (7) is formed in four directions at 45 degrees from the center.The rear end of the main shaft (8) , is fixed (9) at the center of the vertical part 06) of the varnish slider 01, which has a U-shaped planar cross section and a sidewall shape. A box-shaped first slider installed at a vertical position [
The space α2 between 115 and the vertical portion a6 of the first varnish slider flol has the slide stroke width required by the first slider till. Also, the first slider (11
The tip of the rain horizontal portion No. 1 naturally coincides with the tip of the varnish slider 0 when it is pressed into molding.

+13) (13) I3) I3) is a notch provided on the inner surface of the tip of the first slider aD, and each of these notches has a rear segment H (11σ9 (I9 is pivotally attached) (
As will be discussed, the main shaft (8) passes through the center of the vertical portion of the first slider (111).
141 is a rear side part α projecting in a square shape with a stepped part from the main body.
This slide body is fitted onto the main shaft (8) with the circumferential surface of the first slider Uυ in contact with the inner surface of the first slider Uυ, and this slide body has four operating rods 151 + 151 a5) at its rear end.
The front end of the shaft is fixed, and this operating rod passes through the vertical portion α6u6 of the first and second sliders (11)+101 and is connected to the rear hydraulic cylinder 00.

In addition, a space α between the rear side part α of the slide body (141) and the rear side part uf+inside of the first slider (11)
η is the slide stroke width required by the slide body α. Around the rectangular rear side part α4 of the slide body α, a notch step part (181+181 IC
J (1'119 is the tip notch (13) of the first slider (111) with each proximal end a4 pivoted (
(a) The rear segment is provided by extruding (a), and each proximal end portion (14) of this rear segment is the slide main body (14).
1, and the lower surface of the base end a4 is in contact with the bottom surface of the notch step portion 081. (26 tm
tzh is an extension bullet interposed between the distal end notch (131) of the first slider (111) and the proximal end of the rear segment (19!) adjacent to the pivot point ■ of the rear segment (1!J). Also, on the upper surface of each posterior segment near the tip of J'J.

A protruding portion cn cn 12n 12n is formed to form a part of the undercut peripheral surface. (c) (
C) ■■ is the base end of the can diameter side segment 0!10 (I
'CJ is a space step formed on the lower surface toward the center of the lower surface, and the rear end and front end of this space step (2) form an inclined surface I3a facing in opposite directions. Inclined surface c41G that moves downward in contact with inclined surface 123 at both rear and front ends of this space step ■
! 4 are formed on the horizontal surface +t40 rear end and tip of the slide body (14).

(To) I29Q! 3 (to) is the horizontal slide core (7
1. Pivotally attach the beginning of each proximal end to each space step () of 71 (to)
(to) (to) (to) (to) The front segment is provided, and the lower surface of the proximal end of this front segment is in contact with the main axis (8). The lower surface of the rear side of each front segment (end) contacts the inclined surface d of the tip end of the slide body α. Further, on the upper surface near the tip of each front segment s, there is a protrusion that forms a part of the undercut circumferential surface.
It forms @. Each protrusion of this front segment can (
C) and the rear segment (19) (each protrusion 2)) fit into each other from both the front and back directions, so that the whole unit coincides with each other to form one segment nesting type.

Now, as shown in Fig. 1, when the molding work of the tube joint with the T-shaped undercut is completed, the vertical slide core ( 5)
automatically moves rearward, and at the same time, each member on the left and right horizontal slide cores f71 +71 side also moves rearward in stages. The movement order of the horizontal slide core (7), which is an important element in the present invention, is as follows.

First, the slide body (141 is the operating rod α51 (15)
(15) Q5) and is pulled rearward by the hydraulic cylinder (10).

This slide body (141b-z First, the rear space aη
However, when the rear side α4 of the slide body α comes into contact with the vertical part (16) of the varnish slider (Ill), the slide body a41 continues to push the varnish slider (+1) and move the rear space part (12+). As the slide body α moves backward, each notch step (+
From 81 to each rear segment (each rear end of 19 (+4 is spaced apart, the bottom of the space step (18) of the slide body α is the rear segment) (moves while touching the lower surface of the rear end of 11) , eventually the rear slope of the space step @ becomes the rear segment H.
l! It touches the rear end inclined surface (C) of J (see Fig. 2 for the above action). Then, since the slide body 0 is pulled further rearward, the rear end inclined surface Q4 tries to push up the rear inclined surface (c) of the rear segment (+!1) which comes into contact with it. As the rear end of the segment (Ll (1') tries to rotate about the pivot point The front part of each rear segment 09 is tilted in the direction of the support axis (8).
2D separates from the recess (4) of the horizontal part (31) of the fixed mold (1) into which it had been fitted, and inserts its tip into the main shaft (8).
) direction, the front inclined surface of the IP9 comes into contact with the tip inclined surface of the slide body α4, and in this state the slide body α moves rearward. During this movement of the slide body I, its rectangular rear side part αj first comes into contact with the vertical part uf+'' of the first slider (11), and further moves together with the first slider (111), thus forming the aforementioned rear segment. +19 was moved in the direction of the main axis (8), and eventually the varnish slider (101
(See Fig. 3 for the above action).

When the varnish slider 0■ moves backward due to the pressing force of the slide body α, the vertical part of the varnish slider 0■ +1
The main shaft (8) whose rear end is fixed to i is also pulled at the same time. When this main shaft (8) is bent backward, the horizontal slide core (7) fixed to its tip also moves, but each space step ( The front segment ω, which is pivoted to 71, also moves at the same time.At the time of molding, this front segment is in a state of being alternately fitted and integrated with the rear segment a!l. As described above, if each rear segment (19) is thorn-shaped in the direction of the main axis (8), the adjacent segment that supported each front segment (toward) will be lost, so it will naturally pivot. Main shaft (8) with part (c) as the fulcrum
It will start to fall down in the direction. Therefore, the rear segment 0!1 is also connected to the fixed mold (1) that was fitted until then.
Since the horizontal part (3) of the horizontal part (3) is separated from the recess (4) and its tip falls in the direction of the main shaft (8), there is no obstacle to the movement of the horizontal slide core (7) at the tip by pulling the main shaft (8). As a result, when the left and right horizontal slide cores (71 + 71) are completely separated from the left and right horizontal parts +31 +31 of the fixed mold (1), the movement of the horizontal slide core parts stops (per the above action).

(See Figure 4). In this state, the molded pipe fitting (a) with the undercut (b) is lifted from the fixed mold (this completes the work process for removing the product.

When starting molding work again, move and set the vertical slide core (5) and horizontal slide core (7) on the vertical part (2) and horizontal part +31 +31 of the fixed mold (1). , just supply the materials and perform the molding (・.

3. Effects of the Invention Since the present invention has the above-described structure and operation, it enables molding techniques that were conventionally impossible with two-step molding when manufacturing various hollow bodies with uneven surfaces. This has made it possible to mass-produce the invention by increasing production efficiency and greatly reducing production costs, making it extremely effective as an invention that solves technical problems in the industry.

[Brief explanation of the drawing]

The drawings show an embodiment of the device of the present invention, and FIG. 1 is a plan sectional view of the main part, FIGS. 2 to 4 are plan sectional views showing the operating state of the main part, and FIG. 5 is the main part. Fig. 6 is a rear view of the horizontal slide core, Fig. 7 is a perspective view of the front segment, Fig. 8 is a perspective view of the slide body, and Fig. 9 is a perspective view of the rear segment. , FIG. 10 is a perspective view of the first slider section, FIG. 11 is a sectional view taken along line A-A in FIG. 1, and FIG.
The figure is a front view of the finished product. Patent ratio Applicant: Kyowa Kogyo Co., Ltd. Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 (A-A)

Claims (2)

[Claims] (1) A method for molding a hollow body with irregularities, which is characterized in that split movable molds having molding protrusions around them are assembled and separated in accordance with the advance and retreat of a slide core on a fixed mold. (2) A slide core part provided at the tip of the main shaft that slides toward the fixed mold, a slide body that advances and retreats using a cylinder, and a segmented segment that has molding protrusions around it and gathers and separates from each other in the front and back. , a molding device for a hollow body with unevenness, comprising two sliders that move forward and backward together with the slide body.