JPS62181108A - Molding mold - Google Patents

Abstract

PURPOSE:To permit to form a through hole on the flat plate part of a molded form simultaneously with the molding of the molded form without using a core by a method wherein a recessed mold and a protruded mold, which are capable of effecting relative movement into a direction along the surface of the flat plate part of the molded form, are provided with specified groove and rail. CONSTITUTION:A clearance is generated between the front surface forming surface 37 of a recessed mold A and the rear surface forming 49, 50 of a recessed mold B in a condition that the protruded mold B is inserted into the recessed mold A, the rails 51, 52 of the recessed mold B are extended into the recessed mold A along the centerlines of the grooves 40, 41 of the recessed mold and the crests of the tip end side of the rails are contacted with the front surface forming surface 37 of the recessed mold. When resin is poured to fill all of the cavities between the recessed mold A and the protruded mold B under this condition and the recessed mold A is separated from the protruded mold B after curing the resin, through holes, penetrating the flat plate parts 23, 28 of the molded form 8 in the directions of the thicknesses thereof are formed by the contact between the tip ends of respective protrusions 51, 52 and the front surface forming surface 37 of the flat plate part. During this operation, the protruded mold B moves relatively with respect to the recessed mold A along the surface 37 into an arrow sign direction (a) while the protruded mold B moves relatively with respect to the recessed mold A into the reverse direction of the arrow sign (a) along the surface 37 upon releasing the mold.

Description

Detailed Description of the Invention A9 Object of the Invention (11 Industrial Application Fields) The present invention provides for the flat plate part of a molded article to be moved relatively only in the direction along the plate surface of the flat plate part. It relates to a mold for a resin molded product that can form a through hole at the same time as molding the molded product.An example of the molded product is an exterior panel of an automobile, and the through hole formed in the flat plate part of the molded product can be used, for example, as an engagement hole for an engagement claw used to connect mutually adjacent exterior panels.

(2) Conventional technology Conventionally, when forming a through hole in the thickness direction in a flat plate part of a molded product using a concave mold and a convex mold that can move relative to each other only in the direction along the plate surface of the flat plate part of the molded product, , a core for forming through holes was used.

(3) Problems to be solved by the invention If a core is used to form a through hole in a flat plate part, not only the structure of the mold becomes complicated, but also the operation of the mold during molding becomes complicated. Work efficiency is not good. Therefore, the present invention uses a concave mold and a convex mold that can move relative to each other only in the direction along the plate surface of the flat plate part of the molded product, and simultaneously penetrates the flat plate part of the molded product without using a core. The main objective is to obtain a mold that can form holes.

B1 Structure of the Invention (Means for Solving Problems 11) According to the present invention, a molded article having a flat plate part is composed of a concave mold and a convex mold that are movable relative to each other only in the direction along the plate surface of the flat plate part. In the mold, the concave mold includes a surface forming surface forming the surface of the flat plate portion, and an edge of the surface forming surface directed inward of the concave mold in a direction of relative movement between the concave mold and the convex mold. and a groove having a constant width and a constant length formed along the surface forming surface. From the base end of the back forming surface at a position corresponding to the concave groove in the direction of relative movement of the concave and convex shapes, from the width of the concave groove along a center line that coincides with the center line of the concave groove. It is characterized by having a protrusion that is narrow in width, longer than the length of the concave groove, and has a height equal to the distance between the concave surface forming surface and the convex back surface forming surface. A mold is obtained.

(2) Effect When the convex mold is fitted into the concave mold, a gap is created between the surface forming surface of the concave mold and the back surface forming surface of the convex mold, and the protrusion of the convex mold is located at the center of the groove of the concave mold. It extends inward of the concave mold along the line, and its tip side edge is in contact with the surface forming surface of the concave mold.

In this state, all the gaps between the concave mold and the convex mold are filled with resin, and when the concave mold and the convex mold are released after the filled resin has hardened, the inner part of the molded product is released from the edge of the flat plate part. A groove is formed that is recessed from the back side toward the front side, and a through hole passing through the flat plate part in the thickness direction is formed adjacent to the inner tip of the groove.

(3) Examples An embodiment of the present invention will be described below with reference to the drawings.

First, in FIG. 1, a motorcycle 1 has a front wheel 3 at the front lower part of a vehicle body 2, and a rear wheel 4 at the rear lower part,
It also has a handle 5 at the upper front and a seat 6 at the upper rear. The front part of the vehicle body 2 is covered with a front cover 7, the central part is covered with a floor panel 8, and the rear part is further covered with a body cover 9.

FIG. 2 shows a connecting portion between the front cover 7 and the floor panel 8. The front cover 7 has a floor portion 10 and
This floor part 10 has side plate parts 11 and 12 that are continuous on both the left and right sides, and the floor part 10 has a pair of reinforcing lips 13 in the front and rear directions,
14 are integrally formed. An engaging piece 16 having a downwardly directed engaging claw 17 at its distal end is integrally formed on the connecting end edge of the side plate 11 so as to protrude rearward via the proximal end connecting part 15. At the same time, an engaging piece 19 having a downwardly directed engaging claw 20 at its distal end is integrally formed on the connecting edge of the side plate part 12 so as to protrude rearward via the proximal end connecting part 18. There is.

The floor panel 8 includes a floor portion 21, side plate portions 22.27 continuous to both left and right sides of the floor portion 21, and each side plate portion 22.27.
Flat plate part 23.2 that is continuously bent inward at the lower edge of
8, and the floor portion 21 has a pair of reinforcing ribs 3 in the front and rear direction.
2.33 are integrally formed.

As shown in FIGS. 2 and 5, from the front edge of the flat plate part 23 toward the rear, there is a stepped groove bottom plate part 25, and from the upper surface, that is, the back surface side of the flat plate part 23, to the lower surface of the flat plate part 23. That is, a groove 24 recessed toward the surface is formed, and this groove 24
A through hole 26 is formed in the flat plate portion 23 adjacent to the rear end portion and penetrates in the thickness direction.

・Similarly, a groove 29 is formed in the flat plate part 28 from the front edge toward the rear in a direction 43, having a stepped groove bottom plate part 30 and recessed from the back side of the flat plate part 28 to the front side. 29
A through hole 31 penetrating in the thickness direction is formed in the flat plate portion 28 adjacent to the rear end portion.

As shown in FIGS. 3 and 4, when the front cover 7 and the floor panel 8 are connected,
The engagement claw 17 at the tip of the engagement piece 16 of the front cover 7 engages with the through hole 26 of the floor panel 8, and the engagement claw 20 at the tip of the engagement piece 19 of the front cover 7 engages with the through hole 26 of the floor panel 8. It is engaged with the through hole 31 of. The left and right reinforcing ribs 13 and 14 of the front cover 7 are aligned with the left and right reinforcing ribs 32 and 33 of the floor panel 8, respectively. Thus, when the front cover 7 and the floor panel 8 are connected to each other, relative movement in the front-rear direction and left-right direction is inhibited, and relative movement in the up-down direction is also restricted. By fixing the cover 8 to the vehicle body 2, it is possible to prevent the front cover 7 or the floor panel 8 from coming off and falling due to movement of the vehicle body 2 such as vibration.

6 to 8 show an example of a mold that can be used in molding the floor panel 8 according to the present invention. This mold consists of a concave mold A and a convex mold B. The concave mold A has a floor forming surface 34 for forming the floor 21, a side plate forming surface 35.36 for forming the side plate 22.27, and a flat plate for forming the flat plate 23.28. It has a surface forming surface 37, and a floor forming surface 3.
4 is formed with lip forming grooves 38 and 39 for forming reinforcing ribs 32 and 33, and the flat plate surface forming surface 37 is provided with grooves 40 for forming uneven groove bottom plate parts 25 and 30. .41 is formed, and in the deepest part of the concave A,
An end wall surface 42 is formed to form the rear edge of the floor panel 8.

The convex shape B has an upper surface 43 for forming the floor 21 in cooperation with the floor forming surface 34, and an upper surface 43 for forming the side plate 22.27 in cooperation with each side plate forming surface 35.36. Side 44.45
and a lower surface 46 formed so as to be in contact with the central part of the flat plate surface forming surface 37, and reinforcements are provided at positions near both side edges of the upper surface 43 in cooperation with the rib forming grooves 38 and 39, respectively. Projections 47 and 48 for forming the ribs 32 and 33 are formed at positions outward from both left and right edges of the lower surface 46 in cooperation with the flat plate surface forming surface 37 to form the flat plate part 23. .28 flat plate surface forming surface 49.
50 is formed. Then, each flat plate surface forming surface 4
9.50, when the convex mold B is fitted into the concave mold A, there are grooves 40.4 for forming each stepped groove bottom plate part 25.30.
Located on the center line that coincides with the center line of 1, Zendo 40,4
1, and the length from the base to the tip of the convex type B is longer than the length of the guides 40 and 41, and the height is the flat plate part back surface forming surface 49.50 and the flat plate surface forming surface. 3
Projections 51 and 52 having a height equal to the distance between them and 7 are formed. Further, the length from the base of the convex mold B to the end surface 53 is equal to the depth from the opening to the concave mold to the end wall surface 42.

Thus, after the convex mold B is moved in the direction of the arrow a relative to the concave mold A and is completely fitted and positioned within the concave mold A, all the gaps between the concave mold and the convex mold B are removed. When the concave mold A and the convex mold B are released after the resin is injected and cured, the through holes 26 and 31 are formed by the contact portions between the tips of the protrusions 51 and 52 and the flat plate surface forming surface 37. is formed and a floor panel 8 having through holes 26, 31 as shown in FIG. 2 is molded. During this time, the convex mold B moves relative to the concave mold in the direction of arrow a along the flat plate surface forming surface 37, and when releasing the mold, the convex mold B moves relative to the concave mold A in the direction of arrow a. In the opposite direction to the flat plate surface forming surface 3
relative movement along 7.

C0 Effects of the Invention As described above, according to the present invention, the mold has a concave mold and a convex mold, and in the concave mold, there is a surface forming surface that forms the surface of the flat part of the molded product, and a surface forming surface that forms the surface of the flat part of the molded product. A groove having a constant width and a constant length is formed along the surface forming surface from the edge toward the inside of the concave mold in the direction of relative movement between the concave mold and the convex mold. A back surface forming the back surface of the flat plate part of A height that is smaller than the width of the concave groove, longer than the length of the concave groove, and equal to the distance between the concave surface forming surface and the convex back surface forming surface along the center line coincident with Since the concave mold and the convex mold only move relative to each other in the direction along the plate surface of the flat plate part of the molded product, the tip of the convex protrusion and the concave surface forming surface Through-holes can be formed in the flat plate part of a molded product without using a core due to the contact portion with the molded product, and through-holes can be formed in the flat plate part of the molded product using a mold having a simple structure. Therefore, the operation of the mold during molding becomes easy, and the work efficiency is further improved.

[Brief explanation of drawings]

Figure 1 is a side view of a motorcycle equipped with a floor panel as an exterior plate, which is an example of a molded product, and Figure 2 is an enlarged partial perspective view of the connection between the front cover and floor panel of the motorcycle in Figure 1. A perspective view, FIG. 3 is a partially broken perspective view of the main part of the front cover and floor panel in a connected state in FIG. 2, and FIG. 4 is a partially broken perspective view taken along the rV-rV line in FIG. 3. FIG. 5 is an enlarged side view of the main parts, FIG. 5 is a perspective view of the main parts of the floor panel, and FIG. 6 is a mold 8 consisting of a concave mold and a convex mold for molding the floor panels shown in FIGS. 2 to 6 as a molded product. A vertical sectional view of the main part taken along the line Vl-Vl in the figure, No. 7
This figure is a longitudinal cross-sectional view of the main part showing the state of the mold shown in FIG. 6 during molding, and FIG. 8 is a cross-sectional view of the main part taken along the line ``---'' in FIG. 7. 23.28...Flat plate part of molded product, 37...Flat plate surface forming surface, 40.41...Groove, 49.50...Flat plate part surface forming surface, 51.52...Protrusions , A...concave type, B...convex type

Claims (1)

[Claims] The flat plate part (2) of a molded product having flat plate parts (23, 28)
3, 28) is a mold consisting of a concave mold (A) and a convex mold (B) that are movable relative to each other only in the direction along the plate surface, and in the concave mold (A), the flat plate part (23, 28), and the inside of the concave mold (A) in the direction of relative movement of the concave mold (A) and the convex mold (B) from the edge of this surface forming surface (37). grooves (40, 41) having a constant width and a constant length formed along the surface forming surface (37) in the convex type (B); , 28), and the back surface forming surfaces (49, 50) forming the back surfaces of the
0) in the direction of relative movement of the concave mold (A) and convex mold (B) from the base end of the back surface forming surface (49, 50) at a position corresponding to the groove (40, 41) of the concave mold (A). , the concave (A) groove is narrower than the width of the concave (A) groove (40, 41) along a center line that coincides with the center line of the concave (A) groove (40, 41); (40, 41) and has a height equal to the distance between the concave (A) front surface (37) and the convex rear surface (49, 50). 51, 52).