JPH0381023A - Manufacture of flange by press working - Google Patents

Abstract

PURPOSE:To improve the manufacturing efficiency by forming the ring type detention projection inclined aslant to the inside from the bottom outer peripheral edge of the recess part toward the upper edge around the outer peripheral edge of the recess part formed on the metal plate. CONSTITUTION:The circular recess part 4 is formed at the central part of upper surface of the flange blank material 1 by press working. After then, the press working is executed around the outer peripheral edge of the recess part 4 with the die having a slightly larger cutting blade than the recess part 4 on its down side. And the ring type detention projection 5 which is inclined aslant to the inside toward the upper edge from the bottom outer peripheral edge of the recess part 4. Therefore, the accurate ring type detention projection where inside surface is formed as the detention surface is obtained.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to the production of a flange by press working that is suitable for integrally fixing to the end face of a synthetic resin molded product to form a composite molded product with a synthetic resin. It's about how to do it.

[Conventional technology]

Conventionally, in composite molded products such as small motors, in which the main body is formed of a resin molded product and a metal flange is integrally fixed to the end face of the molded product, molding, especially the combination of synthetic resin and The metal flange must have a special structure to ensure a strong integration.

Traditionally, to manufacture such flanges, No. 9.1
As shown in Figure 0, a band-shaped metal plate (
A) is fed onto the lower mold (not shown), and a plurality of small diameter holes (c) are first punched on a circle with a desired diameter using a mold punch (not shown), and then the next step is carried out. Then, the small diameter holes (b) are pressed into a countersink shape (b), and then the upper surface of the central part surrounded by these small diameter holes (b) is stepped by press processing to form a circular recess (C). ), and a shaft insertion hole (d) for a motor shaft, etc. is bored in the center of the recess (C), and in the next step, small diameter mounting holes (e) are drilled on all sides, and then a rectangular shape is formed. It is manufactured by cutting out (f).

In order to fix such a flange to the end face of a resin molded product, molding is performed, especially by filling part of the resin into the countersink hole and the recess (C). Expansion increases the locking force and allows for integration, but in order to provide stronger adhesion, it is necessary to
) is formed with a resin locking part.

However, in order to form the resin locking part in the recess (C), conventionally, the flange obtained by press working as described above is formed in a separate process.

That is, the flange having a press bottom shape is removed from the pressing process, and an undercut is made using an appropriate cutting tool so that the vertical peripheral wall of the recess (C) is expanded in diameter from the upper opening side toward the bottom surface, and as shown in FIG. At present, the locking surface is formed in a vague manner as shown in the figure.

[Problem to be solved by the invention]

In this way, since the locking surface (6) is formed by an undercut on the circumferential wall of the recess (C) in a process different from the press working of the flange, not only is efficient manufacturing impossible, but also the flange cannot be removed during cutting. Each time, it is necessary to accurately position the cutting tool and fix it in that state, which causes problems such as complicating the cutting work and making it difficult to mass-produce flanges with high precision. .

The present invention solves these problems and provides a method for manufacturing a flange by press working, which aims to eliminate the cutting process and form an undercut-shaped locking part by a series of press processes.

[Means to solve the problem]

In order to achieve the above object, the method of manufacturing a flange by press working of the present invention involves forming a circular recess in the center of the upper surface of a flange material made of a metal plate by pressing, and then A ring-shaped locking protrusion is formed around the periphery using a mold having a cut edge slightly larger in diameter than the recess at the lower end, and is inclined inwardly from the outer periphery of the bottom surface of the recess toward the upper end. It is characterized by forming.

Further, the second aspect of the present invention is to form a hole of an appropriate diameter in the center of a flange material made of a metal plate, and to form a ring-shaped protrusion protruding upward on the periphery of the hole. A mold having a tapered lower end surface is inserted into the hole and the ring-shaped protrusion is press-worked to form a ring-shaped locking protrusion that is inclined diagonally upward toward the outside. It is characterized by forming.

In the method for manufacturing a flange as described above, after the ring-shaped locking protrusion is formed, the outer periphery of the ring-shaped locking protrusion is formed using a mold having push-cutting protrusions provided at regular intervals in the circumferential direction at the lower end. By pressing the surface, it is desirable to alternately and continuously form gently inclined protrusions formed by the press-cut protrusions of the mold and inclined protrusions that are not press-cut on the ring-shaped locking protrusion.

[For production]

According to the first invention, during the pressing process,
After forming a circular recess in the center of the upper surface of the flange material by press working, a mold having a cutting blade with a slightly larger diameter than the recess at the lower end is pressed around the outer periphery of the recess in the next pressing process. By press-fitting the cutting blade to approximately the same depth as the depth of the recess, the narrow outer circumferential annular portion between the cutting blade and the circumferential wall of the circular recess is tilted toward the inside of the recess, and the outside of the bottom surface of the recess is A ring-shaped locking protrusion is formed that slopes diagonally inward from the periphery toward the upper end.

In this case, the degree of inclination of the ring-shaped locking protrusion can be set by the degree of inclination of the inner peripheral inclined surface of the cutting blade.

Further, according to the second invention, the ring-shaped protrusion protruding from the periphery of the central hole of the flange material is pressed by the lower end taper peripheral surface of the mold, so that the ring-shaped protrusion is The inner circumferential surface is uniformly pressed and deformed in the outer radial direction by the tapered circumferential surface, and is formed into a ring-shaped locking protrusion having an inclination degree corresponding to the tapered circumferential surface that is inclined diagonally upward toward the outside. Ru.

In this way, the ring-shaped locking protrusion formed on the flange material is formed by press working, so that a desired flange can be sequentially manufactured efficiently and accurately through a series of press steps.

When the thus obtained flange is molded into a composite molded product with a synthetic resin, the resin wedges into the ring-shaped locking protrusion and is firmly integrated.

Furthermore, by pressing the outer peripheral surface of the ring-shaped locking protrusion using a mold in which push-cut protrusions are provided at regular intervals in the circumferential direction at the lower end, the ring-shaped locking protrusion is By alternately and continuously forming gently inclined protrusions formed by the press-cut protrusions of the mold and inclined protrusions that are not press-cut, the bonding with the resin can be made even stronger.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. In FIGS. 1 and 2, a perforated portion (11 ), locking surface processed part 02), recessed part processed part 03
), a ring-shaped locking protrusion processed part (14), a tapped surface processed part 09, a protrusion press-cut processed part 0ω, and a punched processed part 07) are sequentially arranged at a constant pitch, and each processed part 01) to 0' 7) has a fixed lower die punch and a movable upper die punch.

Among these processed parts (l 1) to Q7), the perforated part CI+), the locking surface processed part 0, the grooved part processed part side, the tapped surface processed part 05), and the punched part G'71 are manufactured by conventional flange manufacturing. Since they are also provided during the process and are well known, the specific means of these processing parts will be omitted and the process will be briefly described.

First, a long belt-shaped metal plate (1), which is a flange material, is fed into the perforation processing part 01), and a central part of a certain length part of the metal plate (1), which is a flange material, and a plurality of places on the outer circumference having a predetermined radius from the central part are formed. An insertion hole (2) and a plurality of small diameter holes (3) are punched in the upper die punch (not shown).

Next, the long belt-shaped metal plate (1) is moved in the length direction by a length corresponding to the vertical width of the flange, and the portion processed in the perforation processing section 01) is sent to the locking surface processing section QZI. Then, the lower part of the small-diameter hole (3) is expanded in diameter using upper and lower molds (not shown) using zero force on the machined part to form a countersunk hole (3゛) with a downward expanding locking surface (3a). do.

After that, the next recessed part G'! Move it to J, and form a circular recess (4) of an appropriate depth around the insertion hole (2) in the area surrounded by the countersunk hole (3°) using an upper mold punch (not shown). .

After machining the recess (4), it is fed into the next step, which is the ring-shaped locking protrusion machining section 04+.

As shown in FIGS. 3 and 4, this ring-shaped locking protrusion has a circular recess (08) into which the recess (4) fits and receives its outer bottom surface. A mold die 09) and an upper mold punch C which is disposed vertically movably above the lower mold die θ9! Φ, and the lower surface of the upper mold punch QO has the circular recess (
A cutting blade (21) having a slightly larger diameter than that of 4) is formed, and the inner circumferential surface (2Ia) of the cutting blade (21) is inclined obliquely inward upward from the sharp end. be.

When the upper mold punch QΦ formed in this way is moved downward,
The sharp end of the cutting blade (21) is connected to the recess (4) of the flange material.
), and when pressed down further from that state, the narrow annular portion between the peripheral wall of the recess (4) and the sharp end of the cutting blade (21) is cut to an appropriate depth by the cutting blade (21). The inclined inner circumferential surface (21a) of the cutting blade (21)
) tilts into the recess (4), and the recess (4)
A ring-shaped locking protrusion (5) of a constant height is formed obliquely inwardly at an angle of approximately 45 degrees from the outer peripheral edge of the bottom surface toward the upper end.

During this machining process, tapped holes (6) are drilled on all sides of the outer circumference of the countersunk holes (3') arranged on the circumference.

Subsequently, it is supplied to the tapped surface processing section 09 to form the tapped hole (
After the lower part of 6) is pressed by an appropriate die and expanded into a countersunk hole shape (6a), the protrusion press-cut portion 06) is formed.
sent to.

As shown in FIGS. 3 and 4, this ridge press-cut portion 06) has a circular recess (22) into which the recess (4) of the flange material is fitted and receives its outer bottom surface. Consisting of a lower mold gouge (23) and an upper mold punch (24) that is vertically movably disposed above the lower mold gouge (23), the lower surface of the core upper mold punch (24) As shown in FIG. 5, there is a fixed width fitting blade part (25) having the same diameter and the same shape as the cutting blade (21>), and a slope of the fitting blade (25) with respect to the horizontal plane. A sloped surface with a gentle slope angle (
26a) having a constant width are alternately formed in the circumferential direction.

When the upper mold punch (24) formed as described above is moved downward in a state where the recess (4) is fitted into the lower mold gouge (23), the punch formed in the flange material by the pushing cutting blade (26) is removed. The ring-shaped locking protrusion (5) is cut at regular intervals in the circumferential direction from its proximal end to its distal end (27) (
27)...(27) Cutting line (27) corresponding to the inclined surface (26a) of the pushing cutting blade (26) (27)
The part between is pushed down by the inclined surface (26a), and the inclined protruding piece (5a) is provided in the part between adjacent cutting lines (27) (27) which are not subjected to the pressing action of the inclined surface (26a).
Gently inclined protrusions (5b) are alternately formed in the pressed portions.

In this way, the ring-shaped locking protrusion (5) is divided into multiple parts in the circumferential direction and formed into an inclined protrusion (5a) and a gently inclined protrusion (5b), and then transferred to the next punching section 07). The flange material is punched out (7) by an upper die punch (not shown) having a punching blade in the same shape as the flange peripheral edge shape on the lower surface, thereby producing a flange.

All of the above processing steps are carried out simultaneously, and the long strip metal 1) that is the flange material is processed individually for each flange shape growth, and is sent to the next step at a constant pitch. Flanges are manufactured through sequential processing.

Figure 6 shows a cross-sectional view of a composite molded product in which the manufactured flange CF) is integrally joined to the end face of the resin body (M) of a small motor. (3゛) and is engaged with the inner surfaces of the inclined protruding piece (5a) and the gently inclined protruding piece (5b) of the ring-shaped locking protrusion (5) in a wedge-shaped state, Both are strongly integrated.

Next, in the above embodiment, the ring-shaped locking protrusion (5) was pressed into the recess (4) pressed into the flange material, but the present invention is not limited to such a recess. Even in such a flange material having a circular hole (8) in the center, a ring-shaped locking protrusion can be press-molded, and the method will be explained based on FIGS. 7 and 8.

First, a long belt-shaped metal plate (31), which is the flange material, is fed into a punching section using a press, and large diameter circular holes (8) are formed at regular intervals in the center of the plate. The product is transferred to a processing section, and a ring-shaped protrusion (9) of an appropriate height is press-formed around the circular hole (8) and stands upwardly.

Next, in the next step, the upper mold punch (33), which has a tapered peripheral surface (32) inclined inwardly toward the lower end on the outer peripheral surface of the lower end, is placed on the lower mold punch (34). It is moved downward toward the placed flange material and its lower end is inserted into the circular hole (8) of the flange material, and the inner peripheral surface of the ring-shaped protrusion (9) is pressed by the tapered peripheral surface (32). , the ring strip protrusion (9) is expanded and inclined in the outer diameter direction to form a ring-shaped locking protrusion 00).

After that, in the next step, a contact tapered surface portion (35a) having the same inclination as the tapered peripheral surface (32) of the upper mold punch (33) and a corresponding contact tapered surface portion (
The upper mold (35), in which pressing cutting blades (35b) having a gentler inclination with respect to the horizontal plane than 35a) are alternately provided at constant circumferential lengths, is moved downward toward the lower mold guide (36). Then, the ring-shaped locking protrusion 00 is cut (37) (37) (37) at regular intervals in the circumferential direction from the base end side to the distal end by the pushing cutting blade (35b). Cutting line (37) corresponding to the inclined surface of the pushing cutting blade (35b)
) (37) The part between is pressed down by the inclined surface,
An inclined projecting piece (10a) corresponding to the abutting tapered surface part (35a)
), gently inclined protrusions (10b) are alternately formed in the pressed portions.

In this way, the ring-shaped locking protrusion Go) is divided into a plurality of parts in the circumferential direction and formed into the inclined protruding piece (10a) and the gently inclined protruding piece (10b), and then transferred to the next punching part and formed on the lower surface. Upper punch with a punching blade of the same shape as the flange peripheral shape (
(not shown), the flange material is punched out (7) to produce a flange.

In this embodiment, a flange having a ring-shaped protrusion (9) integrally protruding from the periphery of the circular hole (8) is formed in advance, and then this flange is supplied to the press processing section and the above-mentioned process is carried out. The ring-shaped locking protrusion 00 and the ring-shaped locking protrusion Q[D are press-formed into an inclined protrusion (10a) and a gently inclined protrusion (10b) using upper mold punches (33) and (35). Good too.

Further, the present invention is characterized in that the ring-shaped locking protrusion (5) or ollD is formed on the flange material by press molding, so that the above-mentioned through hole, small diameter hole, tap hole (6) etc. do not necessarily need to be provided.

〔Effect of the invention〕

As described above, according to the method for manufacturing a flange by press working as described in the claims of the present invention, a circular recess is formed in the center part of the upper surface of the flange material made of a metal plate by pressing, and then the circular recess is formed. Pressing is performed around the outer periphery of the recess using a mold having a cutting blade with a slightly larger diameter than the recess at the lower end to form a ring shape that slopes diagonally inward from the bottom outer periphery of the recess toward the upper end. Since it is characterized by the formation of locking protrusions, it is not necessary to undercut the circumferential wall of the circular recess in a separate process as in the past, but it is pressed diagonally inward continuously by pressing on the same line. The inclined ring-shaped locking protrusions can be sequentially formed on the flange material, which significantly improves manufacturing efficiency and is suitable for mass production.

Furthermore, since the constant thickness portion of the peripheral wall of the recess is formed into a ring-shaped locking protrusion that is inclined diagonally inward from the outer peripheral edge of the bottom surface of the recess toward the upper end using the cutting blade of the mold, the inner surface is locked. It is possible to obtain a highly accurate ring-shaped locking protrusion formed on the surface, and in composite molding with a resin, the fixing force with the resin can be increased by the ring-shaped locking protrusion.

Further, according to the flange manufacturing method by press working described in claim (2) of the present invention, a hole of an appropriate diameter is bored in the center of the flange material made of a metal plate, and a hole protruding upwardly is formed on the periphery of the hole. After forming a ring-shaped protrusion, a mold having a tapered lower end surface is inserted into the hole, and the ring-shaped protrusion is press-worked so that the ring-shaped protrusion is diagonally upwardly directed outward. Since it is formed into an inclined ring-shaped locking protrusion, the ring-shaped locking protrusion can be easily bent by press working, similarly to the above invention. .

In any of the above flange manufacturing methods, after the ring-shaped locking protrusion is formed, the outer side of the ring-shaped locking protrusion is formed using a mold in which push-cutting protrusions are provided at regular intervals in the circumferential direction at the lower end. By pressing the peripheral surface, if the ring-shaped locking protrusion is alternately and continuously formed with gently inclined protrusions formed by the press-cut protrusions of the mold and inclined protrusions that are not press-cut, these inclined protrusions The bonding force with the resin can be made even stronger.

[Brief explanation of drawings]

1 to 8 show embodiments of the present invention.
The figure is a plan view for explaining the manufacturing method, Figure 2 is a side view of the flange material cut longitudinally at a desired point, and Figure 3 is a ring-shaped locking protrusion processing section and a protrusion push-cut. Fig. 4 is a plan view of the flange material in the processing part, Fig. 5 is a partially longitudinal front view of the upper mold punch, and Fig. 6 is a sectional view of the composite molded product provided with the flange. , FIG. 7, and FIG. 8 show another embodiment of the present invention, and FIG.
Figure (a) is a plan view of the flange material into which the ring-shaped locking protrusion has been processed; a) is a plan view of the obtained flange, FIG. 9 is a plan view for explaining the conventional manufacturing method, FIG. 10 is a side view obtained by longitudinally cutting the flange material at a desired point, and FIG. FIG. 11 is a sectional view of a flange in which an undercut is formed in a separate process. (1)...Flange material, (4)...Circular recess, (
5)...Ring-shaped locking protrusion, (5a)...Slanted protrusion, (5b)...Slightly inclined protrusion, Side...Concave processing portion, Round...Ring-shaped locking protrusion Strip processing part, 0ω...Protrusion push-cut processing part, θ force...Punching processing part, 12 (D...Upper mold punch, (21)...Cutting blade. To 2beta δ degrees 10 years

Claims (3)

[Claims] (1) After forming a circular recess in the center of the upper surface of the flange material made of a metal plate by pressing steps, a cut with a diameter slightly larger than that of the recess is made at the lower end around the outer periphery of the recess. Pressing is performed using a mold with a cutting edge,
A method for manufacturing a flange by press working, characterized in that a ring-shaped locking protrusion is formed obliquely inwardly from the outer peripheral edge of the bottom surface of the recess toward the upper end. (2) A hole of an appropriate diameter is drilled in the center of the flange material made of a metal plate, and a ring-shaped protrusion that protrudes upward is formed on the periphery of the hole, and the lower end surface is formed into a tapered surface. A press characterized in that the ring-shaped locking protrusion is formed into a ring-shaped locking protrusion that slopes diagonally upward toward the outside by inserting a mold with a mold into the hole and press-working the ring-shaped protrusion. Flange manufacturing method by processing. (3) After forming the ring-shaped locking protrusion, the outer circumferential surface of the ring-shaped locking protrusion is pressed using a mold in which push-cut protrusions are provided at regular intervals in the circumferential direction at the lower end. According to
The press according to claims (1) and (2), characterized in that the ring-shaped locking protrusion is alternately and continuously formed with gently inclined protrusions formed by press-cut protrusions of the mold and inclined protrusions that are not press-cut. Flange manufacturing method by processing.