JP2578038B2 - Synthetic resin reel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing electronic circuit components such as reels, especially IC chips, in which the components are mounted and fixed on a chain-like body at regular intervals, and are sent to various precision processing or processing stations including heat treatment. A semiconductor TAB (tab) made of a heat-resistant, acid-resistant and alkali-resistant synthetic resin suitable for winding the chain used to be supplied.
It is related to what is called a reel for use.

[0002]

2. Description of the Related Art Conventionally, this kind of reel has a size of 230 to 280.
Vectra (a trademark of Hoechst, liquid crystal polyester resin), Amodel or Radel (trademarks, abbreviations are PFAn, PAS, respectively)
f), etc., is manufactured by injection molding a heat-resistant and chemical-resistant synthetic resin at a high temperature of about 350 ° C., so that the heat-resistant temperature of the product is 200 ° C. or more and the diameter is 300 to 600 mm.
It is said to have a large diameter.

[0003]

Therefore, in the conventional large-diameter reel of this type, since the molding is performed using a synthetic resin having a very high melt viscosity due to heat resistance, the molded article is internally formed. If the ambient temperature during use is as high as, for example, about 200 ° C., the flange tends to “warp” (warp) during use. If the outer peripheral edges of the pair of opposed flanges are warped in the opposite direction, the distance between the reels mounted adjacent to each other on one long shaft becomes large, so that IC parts and the like on the chain-like body There is a problem that it is not possible to precisely position the workpiece at the processing station. Conversely, in some cases, the distance between the flange surfaces is reduced due to the direction in which the two flanges approach each other, making it difficult to smoothly pull out the chain. Therefore, for example, in the case of a reel having a flange diameter of 400 mm, the allowable limit of warpage is about 0.5 mm. However, no conventional synthetic resin injection molding reel satisfies this standard.

In order to solve the problems of the conventional synthetic resin large-diameter reel, the present invention focuses on the flow of a high-viscosity molten resin during injection molding and conducts various studies and studies. As a result of stacking, a gate is also provided at the mold cavity corresponding to the flange outside the reel body, and the amount of molten resin injected per unit gate at the flange is more than the amount of press-fit per unit gate at the body. By increasing the margin or, if a blind wall is provided between the windows of the flange, by making a plurality of holes in the wall, the flow of the high-viscosity molten resin can be made uniform throughout the reel, as described above. It is an object of the present invention to provide a reel that can satisfy the quality standard of the reel.

[0005]

The structure of the present invention for achieving the object will be described with reference to FIGS. 1 to 5 corresponding to the embodiment. First, a heat-resistant and chemical-resistant material according to the first invention will be described. The reel made of synthetic resin having the properties, especially acid resistance and alkali resistance, has a flange (20) connected radially outward from the end plate (11) of the body (10). Is formed by joining a half-split body with a window edge rib (22) formed on the outer peripheral surface of a plurality of windows (21) opened in the circumferential direction around the hub (12) of the trunk (10) It is the same as the conventional product in the point. However, the feature of the reel of the present invention is that the body burr (14) generated on the body end face plate (11) corresponding to the mold gate during molding with a synthetic resin does not protrude outside the reel end face (r). In the state, compared to the width of the concave portion A (15) having the bottom surface (15a), it is close to the window edge rib (22) of the flange (20) and correspondingly corresponds to the mold gate portion and the body burr (14)
The point is that the diameter of the circular recess B (23) at the center of the bottom surface (23a) is made larger without the flange burr (24) being larger than projecting outside the reel end surface (r).

On the other hand, the synthetic resin reel having heat resistance and chemical resistance, particularly acid resistance and alkali resistance, according to the second invention, has a flange (20) having a radius from the end plate (11) of the body (10). The flange (20) has a hub (1) on the body (10).
A window edge rib (22) is formed on the outer peripheral surface of a plurality of windows (21) opened in the circumferential direction around the center (2), and two adjacent windows (2) are formed.
This is the same as the conventional product in that a half body having at least one blind wall (25) sandwiched between 1) and (21) is joined.
However, the feature of the reel of the present invention is that it corresponds to the mold gate portion at the time of molding with synthetic resin and the body end face plate (11) and the flange.
A concave portion A (15) having a body burr (14) and a flange burr (24) on the bottom surfaces (15a) and (23a) and a circle at a portion near the window edge rib (22) of (20), respectively. A recess B (23) is formed, and a plurality of through holes (26) arranged in the circumferential direction are formed in the blind wall (25).

[0007]

According to the first aspect of the present invention, as described above, high flow due to the small thickness is applied to the cavity portion having a small thickness corresponding to the flange portion during injection molding. A gate with a large opening area to compensate for resistance (that is, a gate corresponding to the large-sized flange burr (24))
, A high-viscosity molten resin flows in with sufficient pressure.

Therefore, when the reel of the first invention is formed, the molten resin is further increased from the portion of the cylinder (11) to the portion of the flange (20) while the temperature is lowered as in the conventional case. The situation of inflow while generating residual stress and internal strain due to flow resistance is completely avoided. this is,
This is not only advantageous in preventing the occurrence of warpage in the flange after molding, but also contributes to shortening the time required for one shot in the injection process.

According to the second aspect of the present invention, a window is opened in most of the fan-shaped portion where the flange is divided into six in the radial direction.
When the remaining fan-shaped portion is a blind wall, for example, for sticking a label, the blind wall is formed with a plurality of through-holes. Therefore, uneven flow of the molten resin due to the presence of the blind wall is provided. In addition to reducing once, the direction of residual strain, which cannot be eliminated, is disturbed by the existence of the plurality of through holes, and has an effect of preventing the direction from appearing as warpage in one direction.

[0010]

1 shows a reel according to an embodiment common to the first invention and the second invention, in which a large-diameter flange (20) extends from an end plate (11) of a body (10) on the same plane. The flange (20), which is continuously provided and forms an annular shape, has five fan-shaped portions which are divided into six in the circumferential direction, and has a window (21) in a radial direction centering on the hub (12) of the body (10). ) Has been established. And two adjacent windows (2
A blind wall (25) is formed in one fan-shaped portion sandwiched between (1) and (21).

Annular grooves (13), (13) are formed on the outer surface of the body end plate (11) and form concentric circles with the hub (12) as a center.
On the outer surface of the flange (20), a window edge rib is provided around the periphery of each window (21).
(22) is formed. 600mm in diameter of such a shape
The two halves of the above are joined in an opposing or symmetrical manner to form a heat-resistant and chemical-resistant synthetic resin reel (R). FIG. 3 shows a cross section or an end face of a cut portion for convenience.
5 show only one half.

This reel (R) is obtained by injection molding at 350 ° C. using Vectler (trademark, supra) as a heat-resistant synthetic resin. A body burr (14) is formed in the annular groove (13) of the body end face plate (11) corresponding to the mold gate during molding. The annular groove (13) containing the burr corresponds to the concave portion A (15). In other words, a large number of circular concave portions A (15) are connected to form an annular shape, and a body burr (14) protrudes from the bottom surface (15a) of some of the concave portions A.

On the other hand, a circular recess B (23) which is close to the window edge rib (22) of the periphery of every other window (21) of the flange (20) and is also arranged corresponding to the mold gate portion. The diameter of the annular groove (1
3), that is, larger than the diameter of the recess A (15), and protrudes from the center of the bottom surface (23a) of the circular recess B (23).
4) is larger than the body burr (14) at the center of the recess A (15).

Thus, the high-viscosity molten resin press-fitted from the mold gate is moved from the circular recess B (23) to the neighboring window edge rib (22).
And the inner peripheral portion of the rib (22) is in communication with each other, so that the circular concave portion B (23) is not formed.
The ribs of the windows (21) of every other sector also flow to the sector, and further through the radial ribs (28) the outermost ribs (29)
Also flows to Outer and inner annular grooves (13), (13) forming concentric circles on the outer surface of the trunk end plate (11) are each 120 °.
6 recesses A at intervals, but offset by 60 °
Since (15) is provided, it goes without saying that the molten resin also uniformly flows into the body end face plate.

The blind wall (25) has six circular through holes (2).
6) is drilled at equal intervals in the circumferential direction. The operation of the through hole (26) is as described above. The window (21) has a function of not only confirming the perspective of the chain-shaped body wound on the body from the side, but also quickly equalizing the temperature to the inner layer of the wound body and reducing the weight of the reel.

In the present embodiment, each window edge rib (22)
Has an inner portion adjacent to the outer annular groove (13). Blind wall
In the center of (25), a very shallow dug where a label should be attached
(27) is provided. Numeral (16) indicates a keyway recessed in the axial direction on the inner surface of the hub (12), and numeral (17) indicates a punched hole formed in the body end face plate (11) for weight reduction or the like. The pair of left and right reel halves formed as described above should be joined with the annular rims (10a) of the body (10) and adhered with an appropriate adhesive, or fused using a high frequency welder. It will be a finished product.

The embodiments which are considered to be representative of the present invention have been described above. However, the present invention is not necessarily limited to the structures of the embodiments, but has the above-mentioned constitutional requirements according to the present invention, and The object of the present invention can be achieved, and the present invention can be appropriately modified and implemented within a range having the following effects. For example, the concave portion A in the body portion may be formed into an independent circular concave portion instead of the shape of the annular groove. In this case, the “width of the concave portion A” should be read as “the diameter of the circular concave portion A”.

Furthermore, a circular recess B (23) containing the flange burr (24) may be arranged in all fan-shaped portions, or a through hole (2
It is also possible to omit the blind wall (25) provided with 6), or to arrange the blind wall at two symmetrical positions around the hub (12).

[0019]

As is clear from the above description, in the first invention, a large circular concave portion B corresponding to the molding die gate is provided near the window edge rib also at the flange portion where the window is formed in each sector. Because it is provided, a high melting point and high viscosity heat-resistant synthetic resin flows into each of the thin flanges at the same time as the body, through each rib without excessive temperature drop,
A remarkable effect can be expected in that the flange portion after molding and cooling does not cause warping even if it is repeatedly exposed to a high temperature during use. Further, since the molten resin flows into the flange portion and the body portion at the same time, the time required for one shot in the molding process can be reduced.

According to a second aspect of the present invention, there is provided a synthetic resin reel in which a flange portion includes a window-shaped fan-shaped portion and a blind-wall fan-shaped portion, wherein a plurality of through holes are formed in the blind wall. The required amount of resin in the blind wall during molding can be reduced, which not only improves the weight balance of the entire flange, but also causes the sink and flow in the blind wall because the molten resin flow is disturbed by the presence of through holes. It is difficult to generate residual stress or internal distortion due to marks, etc.
Combined with the arrangement of both the body and the flange, the fear of warpage in the flange after molding and cooling is also eliminated.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is a sectional view taken along the line III-III in FIG. 1;

FIG. 4 is an enlarged end view of a cut portion along a line IV-IV in FIG. 1;

FIG. 5 is an enlarged sectional view taken along line VV in FIG. 1;

[Explanation of symbols]

 (10) Body (11) End plate (12) Hub (13) Annular groove (14) Body burr (15) Recess A (15a) Bottom (20) Flange (21) Window (22) Window edge rib (23 ) Circular recess B (23a) Bottom (24) Flange burr (25) Blind wall (26) Through hole (R) Synthetic resin reel (r) Reel end face

Claims (2)

(57) [Claims] 1. A flange (20) extending from an end plate (11) of a body (10).
Are continuously provided radially outward, and the flange (20) is attached to the trunk (1).
Multiple windows opened circumferentially around hub (12) at (0)
In a reel made of a heat-resistant and chemical-resistant synthetic resin formed by joining a half body having a window edge rib (22) formed on the outer peripheral surface of (21), a mold gate for molding with the synthetic resin is used. The body burr (14) generated on the body end face plate (11) corresponding to the part does not protrude out of the reel end face (r). , The body flash which is close to the window edge rib (22) of the flange (20) and correspondingly corresponds to the mold gate.
(14) Flange burr (24) larger than reel end face (r)
A synthetic resin reel, characterized in that a circular recess B (23) provided at the center of the bottom surface (23a) has a larger diameter without protruding outside. 2. A flange (20) extending from an end plate (11) of a body (10).
Are continuously provided radially outward, and the flange (20) is attached to the trunk (1).
Multiple windows opened circumferentially around hub (12) at (0)
Window edge ribs (22) are formed on the outer peripheral surface of (21),
At least one blind wall (25) sandwiched between two windows (21), (21)
A reel made of a heat-resistant and chemical-resistant synthetic resin formed by joining half-pieces provided with a body, and having a body end face plate (11) and a flange corresponding to a mold gate at the time of molding with the synthetic resin.
The recesses A (15) having the body burrs (14) and the flange burrs (24) on the bottom surfaces (15a) and (23a) and the circular shape, respectively, at the portion near the window edge rib (22) of (20). A synthetic resin reel, wherein a concave portion B (23) is formed, and a plurality of through holes (26) are formed in the blind wall (25).