JPH0857900A - Integrally molding method of core material and resin material and implement for transmitting integrally molding power of the core material to the resin material - Google Patents

Abstract

PURPOSE: To enhance the bending and tensile stresses and to reduce the weight by coupling the resin layers of both the surfaces of a core material via a resin layer fed in a hole, and embedding the entire or the predetermined section of the core material. CONSTITUTION: A core material 1 is engaged with the cavity of the bottom farce. The top force is matched to the material 1, the hole 2 provided in the wall of the material 1 is conformed to the toothform part 3 and the trough 4 of the cavity of the bottom mold, and the material 1 is positioned. Then, resin material is injected via gate suitably disposed above the recess. The material is fed from the recess side via the hole 2 in the cavity of the bottom mold, and the material is put in the cavity and the recess. Thus, the resin layer in the cavity and the resin layer in the recess are coupled in the sutured state by the resin layer fed in the hole 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a rigid core material such as metal,
Regarding a method for integrally molding a molded product formed by coupling with a different synthetic resin material and a device for integrally molding power transmission, more specifically, a rack and pinion used for a motion direction conversion mechanism, or a gear or a circle integrated with a shaft portion. The present invention relates to a method for integrally molding a casting cam or worm or other core material and a resin material, and an integrally molded power transmission device.

[0002]

2. Description of the Related Art Conventionally, in order to produce a rack in a power transmission mechanism which is a combination of a rack and a pinion used in a motion direction converter, a rectangular steel material having a predetermined width, length and hardness is usually used. To obtain a toothed part with a specified pitch on the upper surface, and to obtain a gear with a pinion or other shaft mounted, a toothed part with a specified pitch is provided around the disk with a specified diameter. Since the gears obtained by cutting are mounted on the rotary shaft via pins or screws, the work is complicated, laborious, inconvenient for mass production, and economically inefficient.

Therefore, the core (shaft) material of the metal pipe is arranged and positioned in a mold having a tooth profile, and a resin material is injected into the mold to obtain an integrally molded product of the tooth profile and the core material. A method has been proposed. In this case, since the contact surface between the core material and the resin material (the outer peripheral surface of the pipe) is smooth, the binding force between the core material and the resin layer is weak, and cracks may occur at the contact portion during rapid rotation, etc. The product reliability is low. In order to reinforce this defect, a means for deforming or roughening the outer peripheral portion of the pipe by press working, cutting work, or the like has been provided on the outer peripheral portion of the pipe to improve adhesion. . However, as long as it is a combination of different materials, it was difficult to provide a certain level of cohesive force with this level of reinforcement. In view of the above, the invention of the present application improves the functions such as adhesion, cohesion, and weight reduction in the integral molding of a core material such as a metal and a resin material, and provides a molded product in a labor-saving and inexpensive manner. That is the purpose.

[0004]

In order to achieve the above object, the adhesion between the core material such as metal and the resin layer in the present invention,
In order to improve the binding force and the formability of tooth profile, spiral groove, etc., a plurality of holes are provided at a predetermined interval in the wall part of the core material of the pipe having a flat or curved surface or the core material of the pipe such as metal. In the tooth profile cavity of the mold, there is provided a die having a tooth profile cavity having a space formed by engraving a desired shape such as a tooth profile or a screw groove at a position compatible with the penetration technique and the hole. To
The core material is fitted to the peripheral portion of the tooth profile cavity at substantially predetermined intervals so that the core material is arranged and positioned, and the resin material is injected, and all or a predetermined amount of the core material is injected. It is to combine the technique of embedding the section in the resin layer. Further, the shape of the hole penetrating the core material is such that a long side window or a short side window is opened along the sliding or rotating direction of the molded product in use, or the molded product is moved. It is also possible to combine the techniques of opening adjacent holes in a row along the direction.

[0005]

The core member is formed by penetrating a plurality of holes in a predetermined section of the wall of the core member made of metal or the like, and the space having a desired shape is formed at a position matching the holes. A toothed cavity having a toothed cavity is provided, and the holes formed in the core material are fitted in the toothed cavity of the die at predetermined intervals with respect to the peripheral portion of the toothed cavity. Position the core material in place and inject the resin material into the flat or curved core material on both sides of the core material, and in the case of the core material of the pipe body, the core and the air core part and the pipe. The outer peripheral surface of the body is filled with resin material,
At that time, the resin layer was filled into both side surface portions of the core material, or in the core material of the pipe body, into the air core portion of the pipe body and the outer peripheral portion thereof through the holes provided in the wall body portion. The resin layers are crosslinked through the holes and integrally connected to each other.

Further, since the core material is arranged so that the hole portion of the core material fits the tooth profile cavity at a predetermined interval with respect to the peripheral portion of the tooth profile cavity, the tooth profile or the thread groove portion is formed at the time of resin injection. It is possible to obtain a molded product that does not lose its shape by reducing the possibility of blurring due to internal pressure.

[0007]

First Embodiment A preferred embodiment of the present application will be described with reference to the drawings. 1 to 5, a method of integrally molding a power transmission device such as a rack made of a core material and a resin material according to the present invention is a flat or curved surface made of metal such as stainless steel or other natural fiber, synthetic fiber, ceramics or the like. A thin plate core material (1) is used, and a plurality of holes (2) for resin material inflow are provided in a predetermined section of the wall part of the core material (1) having a required length.
Fits the holes (2) and (2) in a predetermined length section that fits the step of penetrating (2) and the holes (2) and (2) provided in the core material (1) A lower mold (8) having a toothed portion (3), (3) and a cavity (7) in which valleys (4), (4) are engraved is formed, and the core material (1) ) On the opposite side to the upper mold (1) having a recess (9) having a predetermined thickness along the flat surface or curved surface of the core material (1).
0) is formed, and the cavity (7) of the lower mold (8) is formed.
The core material (1) is fitted inside, and on the core material (1),
The upper mold (10) is matched, and the holes (2), (2) provided in the wall portion of the core material (1) and the tooth profile portion (of the cavity (7) of the lower mold (8) ( 3), 3) and the troughs (4), (4) are matched with each other, the core (1) is positioned, and the gate (12) is appropriately disposed above the recess (9). ), And injects the injected resin material into the cavity (7) of the lower mold (8) from the side of the recess (9) through the holes (2) and (2). Let
By filling the cavity (7) and the recessed portion (9) with a resin material, the resin layer in the cavity (7) and the resin layer in the recessed portion (9) are provided with holes (2), (2). The resin layers that have flowed into the structure are connected to each other while being sewn together.

[0008]

[Embodiment 2] In the same 6 to 9, a suitable metal such as stainless steel (1) A thread portion (5) having a predetermined pitch on a wall portion of a required length section on one side, (5) and a plurality of holes (2) for injecting resin material at positions along the screw grooves (6) and (6) at desired intervals (for example, 1 to 4 per turn of the screw). ), (2) and the step of arranging hole portions (2), (2) for material injection in the wall portion on the other side of the pipe (1) a at required intervals, Threaded portions (5), (5) and screw grooves (6), (6) are provided in length sections adapted to the hole portions (2), (2) provided on one side of the pipe (1) a. An upper mold (8) a having a carved cavity (7) a is formed, and a length suitable for the holes (2), (2) provided on the other side of the pipe (1) a. Tooth section ( ), (3) and troughs (4), (4) and a step of forming a lower mold (10) a having a recessed portion (9) a in which a necessary resin layer space portion is engraved, and The other side (lower side in the figure) of the pipe (1) a is inserted into the recessed portion (9) a of the lower mold (10) a, and is positioned and inserted through the ejector pin (14). At the same time, one side (upper side in the figure) of the pipe (1) a is inserted into the cavity (7) a of the upper mold (8) a, and the upper end of the pipe (1) a is raised. The cavity (7) a provided at the upper end of the pipe (1) a after being properly positioned through the positioning pin (13) a
The resin material is injected through the gate (12) arranged in the upper opening of the cavity, and the injected material is injected into the screw grooves (6) and (6) of the cavity (7) a and the lower mold (10) a. The holes (2), (2) penetrating the wall of the pipe (1) a while being injected into the recess (9) a, the recess extended to the recess (9) a, and other appropriately provided recesses. ), The resin material is filled into the air-core portion (15) of the pipe (1) a, so that the resin material of the air-core portion (15) and the screw thread transferred to the outer peripheral portion of the pipe (1) a Parts (5), (5) and tooth profile (3),
(3) Others The resin material surrounding the outer peripheral portion of the pipe (1) a is connected in a stitched state by the resin material filled in the holes (2) and (2), and integrally molded. It will be configured.

Instead of injecting the resin material into the outer peripheral portion of the end portion of the pipe (1) a from the gate (12) provided above the shaft portion of the pipe (1) a, as another embodiment, a resin is used. The material is injected and filled into the core cavity (15) of the pipe (1) a from the gate (12) a provided above the shaft of the pipe (1) a via the nozzle (16), From the holes (2) and (2) arranged in a row, the outer circumference of the pipe (1) a such as the spiral grooves (6) and (6) and other tooth profile portions (3) and (3) It is also possible to fill the inside of a recessed portion surrounding the portion and perform integral molding. (However, illustration is omitted.)

Holes (2) provided in the pipe (1) a,
A predetermined thread portion (5) and a valley portion (4) are filled with the resin material that has flowed from the air core portion (15) side of the pipe (1) a to the outer peripheral surface side through (2), and Pipe (1)
Instead of filling the entire peripheral surface of a so as to cover it (embedding a pipe in the resin layer), as another embodiment, the thread portion (5) and a thread portion ( It is needless to say that the outer peripheral surface of the pipe (1) a between the inclined surfaces of 5) or the intermediate portion between the screw thread portion (5) and the tooth profile portion (3) can be exposed and molded. (FIG. 8)

Therefore, the core material (1) or the pipe (1)
The hole diameters of the hole portions (2), (2) formed in the wall portion of a are slightly different depending on the viscosity of the resin material used for molding, the injection pressure, the mold temperature, etc., but usually the core material (1) or Pipe (1)
The cross-sectional area of the holes (2) and (2) with respect to the surface area of a is
(Diameter and number of holes), 1 / of the surface area of the core material covered with the resin layer
It is desirable to set it to about 25 to 20/25.

Further, the core member (1) or the hole portions (2) and (2) formed in the wall portion of the pipe (1) a, and the tooth profile etc. attached to the outer peripheral portion of the wall portion The relationship with the width of the bulge is usually
Adapted to the central portion of the individual width of the thread portions (5), (5) or the tooth profile portions (3), (3), etc. bulged on the outer peripheral surface of the core material (1) or the pipe (1) a However, in relation to the height of the bulging portion, when there is unevenness such as the tooth profile, the hole (2) is located at the position of the valley of the tooth profile (3) (position closest to the outer surface of the core material). ), It is possible to prevent sinking of the resin material at the position of the valley portion during molding.

In the metal pipe used in the present invention, a tubular body obtained by winding a strip-shaped stainless steel thin plate in a spiral shape and subjecting to drawing is screwed through a suitable rotating mechanism at a predetermined pitch. Stop the screwing of the pipe, and during the screwing stop time or during the screwing, open and close an appropriate light-shielding device and perforate it with a laser beam, etc. to penetrate the desired row of holes.
Alternatively, by using a pipe cut to an appropriate length, it is possible to control the thickness of the pipe, contribute to weight reduction, and obtain an integrally molded product excellent in accuracy and strength. (However, illustration is omitted.)

Further, in the present invention, as means for forming holes (2), (2) in the wall portion of the core material (1) having a flat or curved surface or the pipe (1) a made of metal or the like. Of course, besides opening through the above laser beam, it is also possible to open through an appropriate punch mechanism. In addition, after the molding of the holes (2) and (2), after molding, a hole having a short piece or a long side is formed and opened along the sliding or rotational movement direction when the molded product is used. As a result, the resin layer filled in the holes (2) and (2) increases the resistance to the load from the movement direction, so that a better mechanical function can be exerted during high speed operation. You can (However, illustration is omitted.) Instead of forming a hole having a short side or a long side along the movement direction, a hole with a round cross section is formed along the movement direction in a specific direction. It is also possible to carry out the opening by arranging them in close proximity to each other.

[0015]

Since the present invention is constructed as described above, it has the following effects. (A) The power transmission device such as a rack integrally molded according to the present invention has a predetermined thread portion or tooth profile in a required section of a core material having a hole portion penetrating a wall body of a rigid material such as a metal plate. The core member and the other side of the core member, and the core member is embedded in a resin material that is attached to both sides of the core member. Since it is sewn together with the resin material on both sides, it is excellent in bending and tensile stress, and is lighter in weight, rich in slidability and superior in electrical insulation compared to products obtained by lathe processing. . Furthermore, since the work is extremely easy and labor-saving, it can be provided at low cost.

(B), the thread or tooth profile is a hole in the wall of the core material that fits along the line of the thread groove (the top of the thread or the end of the tooth profile) of the mold. Since the resin material is injected from the portion under a substantially uniform internal pressure, the precision of the pitch and the inclined surface of the thread portion or the tooth profile is high, and the reliability is excellent.

(E) A metal or other tubular body according to claims 2 and 4 is used as a core material, and a screw thread portion or tooth shape portion of a screw is attached around the core material, and a resin layer is filled in the core cavity portion. But,
Since the resin layers filled in the row of holes formed in the wall of the core material are integrally connected to each other in a sutured state,
When the environment changes over time, there is little risk of shrinkage, cracking, expansion, contraction, bending, etc.

(D) In addition, by using the shape of the hole portion according to claim 5 in use, a window portion having a long side or a short side is formed along a sliding or rotating direction. The resin layer filled in the holes can better withstand the load generated by the movement displacement and exhibit a good function.

[Brief description of drawings]

FIG. 1 is an explanatory plan view of a rack in which a core material and a resin material are integrally molded.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB in FIG.

FIG. 4 is a cross-sectional view showing another embodiment of FIG.

FIG. 5 is a cross-sectional explanatory view of a main part of the molding die device.

FIG. 6 is an explanatory plan view of a molded product including a thread portion and a tooth shape portion using a pipe as a core material.

7 is an enlarged partial cross-sectional explanatory view taken along the line CC of FIG.

8 is a partially cutaway enlarged cross-sectional explanatory view showing another embodiment in FIG.

9 is an explanatory cross-sectional view of the main parts of the molding die device in FIG.

[Explanation of symbols]

 1: Core material 2, 2: Hole part 3, 3: Tooth profile part 4, 4: Valley part 5: Thread part 6: Spiral groove 7: Cavity 8: Upper mold 9: Recessed part 10: Lower mold 11 : Positioning pin 12: Gate 1a: Pipe 7a: Cavity 8a: Upper mold 9a: Recessed portion 10a: Lower mold 13a: Upper positioning pin 14: Ejector pin 15: Air core 16: Nozzle

Claims (5)

[Claims] 1. A step of penetrating a plurality of holes at a predetermined position of a wall portion of a core material such as a metal having a flat surface or a curved surface, and one side of the fitting position of the holes. , Forming a lower mold in which a cavity having a space of a desired shape is engraved, and at the other side of the fitting position of the hole of the core,
An upper mold is formed along the outer surface of the core material, in which a recessed portion having a space of a desired shape is engraved, the core material is placed in the cavity, and the core material is penetrated. The cavity of the lower mold is fitted into the hole, and the lower mold is matched. The resin material is injected from the longitudinal end of the core or the body, and the resin layers on both sides of the core flow into the hole. A method for integrally molding a core material and a resin material, wherein the core material and the resin material are connected to each other via the resin layer and the whole or a predetermined section of the core material is embedded. 2. The method for integrally molding a core material and a resin material according to claim 1, wherein a number of holes are provided at predetermined positions in the wall portion of the metal pipe. 3. The shape of the hole penetrating the wall of the core material,
The method for integrally molding a core material and a resin material according to claim 1 or 2, wherein after molding, a hole having a short piece or a long side is formed along a sliding or rotational movement direction in use of the molded product. 4. A resin layer having a number of holes penetrating through a wall portion of a core material such as a metal having a flat surface or a curved surface in a predetermined section, the resin layer being filled on one side of the core material, On the other side of the core material, a resin layer forming a desired tooth profile or screw groove in a predetermined section corresponds to the tooth profile or screw groove on the wall of the core material. An integrally molded power transmission device comprising a core material and a resin material, characterized in that they are connected to each other through a resin layer that flows into a penetrating hole portion. 5. A resin layer, which is formed by penetrating a plurality of rows of holes in a predetermined section of a wall portion of a pipe made of metal or the like, and which fills a core cavity of the pipe, and an outer peripheral portion of the pipe. , A screw thread and a groove of a predetermined screw, or a resin layer that forms a tooth profile and a valley, and a wall portion of the pipe, a screw thread and a groove of the screw, or a tooth profile and a valley. An integrally molded power transmission device of a pipe and a resin material, wherein the pipe and the resin material are connected to each other through a resin layer that has flowed into a hole formed so as to correspond to the portion.