JPS6050998B2 - Manufacturing method for drive side side plate of cylindrical impeller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A boss is inserted into an annular connecting plate, and the rotating shaft portion, in which the boss and the connecting plate are integrally molded from rubber, is aligned concentrically with the outer diameter of the side plate of the cylindrical impeller to be molded. , and after being held and fixed to the holding part of the mold held perpendicularly to the side plate, the side plate or the side plate is attached while enclosing the connecting plate and providing a clearance between it and the rubber. A method for configuring a drive section in a cylindrical impeller characterized by integrally injection molding the blades and integrally molding the rotating shaft on the side plate is disclosed in Japanese Patent Laid-Open No. 51
This method is known from Japanese Patent No. 84408, but when the side plate or the blade is injection molded integrally with the side plate, a clearance is formed between the boss and the rubber between the connecting plates, so the connection is This part of the plate is not covered with the above-mentioned injection molding material and is exposed to the outside. For example, if the connecting plate is made of metal, rust will form in this exposed part, making it brittle. As a result, there were defects such as reduced durability of the drive side plate of the impeller.

The purpose of the present invention is to eliminate such defects by inserting a boss into the center hole of an annular metal connecting plate and insert-molding an elastic body into the inner peripheral edge of the connecting plate. A rotary shaft member is constructed by fixing the rotary shaft member together through a mold, and a mold having an annular cavity for molding the side plate is constructed separately. After that, the outer peripheral edge of the connecting plate is inserted into the cavity through the opening connected to the cavity, and the connecting plate is suspended in the center of the opening by an insert pin provided in the cavity. In addition, the above-mentioned boss is maintained vertically by a holding pin provided in the mold at a position concentric with the outside diameter of the cavity, and the above-mentioned elastic body is placed on the rim of the opening. The gist of this method is to close the opening by bringing it into contact with each other, set the rotary shaft member in the mold, and then fill the cavity and the opening with molding material to solidify the same material.

In the following, embodiments of the present invention will be explained with reference to the drawings.
First, a metal boss 2 is inserted into the center hole of an annular metal connecting plate 1, and this boss 2 is integrally fixed to the inner peripheral edge 3 of the connecting plate 1 via insert molded rubber 4. A rotating shaft member 5 is configured.

In addition, upper and lower molds 8, 8'' each having an annular side plate molding cavity 7 are separately configured, and this cavity 7
A narrow opening 9 having a width equal to the thickness of the connecting plate 1 plus a thickness of 0.6 Tmm or less is continuously provided on the inner peripheral edge of the connecting plate 1. Afterwards,
The outer peripheral edge 3'' of the connecting plate 1 is inserted into the cavity 7 through the opening 9 provided in the cavity 7, and the connecting plate 1 is inserted into the center of the opening 9 by insert pins 10, 1'' provided in the cavity 7. The boss 2 is maintained horizontally in a floating state, and the boss 2 is maintained vertically by holding pins 11, 1'' provided at positions concentric with the outer diameter of the cavity 7 in the molds 8, 8''. By bringing the outer circumferential edge surface 4'' of the rubber 4 into contact with the lip 9'' of the opening 9, the opening 9 is closed, and the rotating shaft member 5 is set in the molds 8, 8''.

Next, in the above-mentioned set state, a hard synthetic resin molding material is filled into the cavity 7 and the opening 9 through the sprue 1, and the molding material is solidified, so that the rotating shaft member 5 is integrated with the side plate 13. Fix it and remove it from the mold 8, 8'' to complete.

Since the method of the present invention is as described above, it goes without saying that it is possible to easily manufacture a drive side plate for a cylindrical impeller that is extremely stable and of excellent quality with no deviations in the coherence, perpendicularity, etc. of the boss. In particular, in the present invention, an opening wider than the thickness of the connecting plate is connected to the inner peripheral edge of the cavity, and then the outer peripheral edge of the connecting plate is inserted and connected into the cavity through the opening connected to the cavity. The plate is suspended in the center of the opening using an insert pin installed in the cavity to maintain it horizontally, and the boss is held vertically using a holding pin placed concentrically with the outer diameter of the cavity in the mold. Then, the opening is closed by bringing the elastic body into contact with the rim of the opening, and the rotary shaft member is set in the two molds, and then the cavity and the opening are filled with molding material. Since the molding material is solidified, according to the present invention, the connecting plate can be completely covered by the elastic body, the side plate formed by the cavity, and the thin film part formed by the opening, and this is possible compared to the above-mentioned known method. To reliably avoid the risk that a part of the connecting plate is exposed and rust occurs in that part, which makes the part weak and reduces the durability of the drive side plate of the impeller. This has the effect of fully achieving the object of the present invention.

Incidentally, in the present invention, the blades may be integrally formed on the side plate 13 in some cases.

[Brief explanation of the drawing]

The figures show an embodiment of the method for manufacturing the drive-side side plate of the cylindrical impeller of the present invention, in which Figure 1 is a plan view of the finished product, and Figure 2 is taken along the line A-A in Figure 1. A cross-sectional view along the line and FIG. 3 are explanatory views showing the state during molding. 1... Connecting plate, 2... Boss, 3... Inner peripheral edge, 3''
...outer peripheral edge, 4...rubber, 4''...outer peripheral edge surface,
5...Rotating shaft member, 7...Cavity, 8,8''・
... Mold, 9... Opening, 9"... Mouth rim, 10, 1"
...Insert pin, 11,1 "...Retaining pin, 1
2...Sprue, 13...Side plate, 14,14''...
Thin film part.

Claims (1)

[Claims] 1 A rotating shaft member is constructed by inserting a boss into the center hole of an annular metal connecting plate and integrally fixing this boss to the inner peripheral edge of the connecting plate via an elastic body formed by insert molding. Separately, a mold having an annular side plate molding cavity is constructed, and an opening wider than the thickness of the connecting plate is connected to the inner peripheral edge of this cavity, and then the outer peripheral edge of the connecting plate is inserted into the cavity. The connecting plate is inserted through an opening connected to the cavity, and the connecting plate is suspended in the center of the opening by an insert pin provided in the cavity to maintain it horizontally, and the outer diameter of the cavity is The above-mentioned boss is maintained vertically by a holding pin provided concentrically with the above-mentioned boss, and the above-mentioned elastic body is brought into contact with the mouth edge of the opening to close the opening, and the rotating shaft member is inserted into the mold. A method of manufacturing a side plate on the driving side of a cylindrical impeller, which comprises filling a molding material into a cavity and an opening after setting and solidifying the molding material.