JP3572515B2 - Gear injection molding equipment - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to an improvement in a gear injection mold apparatus for manufacturing a gear.
[0002]
[Prior art]
Conventionally, as a mold device for injection molding and taking out helical gears and worm wheel gears having a helical inclination with a helical gear groove, first, when molding products, the outer shape is cylindrical with a cylindrical mold. In the second method, the teeth of the gear teeth are toothed with an extrusion die using a pressing die, and when removing the product, the molding die is taken out while sliding in parallel in the same direction as the gear teeth grooves. There is.
[0003]
In addition, since a spiral product was taken out from the pedestal by applying screw-rotating motion along the string winding of the teeth and then taken out after molding, the mold body must also have a complicated shape due to the shape of the gear teeth. The injection molding equipment that had to be used was the mainstream.
[0004]
[Problems to be solved by the invention]
However, in the related art, since the shape of the teeth of the gear molded from the gear injection molding device is not linear but is formed in an oblique direction, the gear is formed on the gear when it is removed from the mold. There is a disadvantage that the teeth are damaged.
[0005]
Also, when removing the molded gear product, the tooth forming mold is removed by first moving the tooth forming mold in the inclined direction because the teeth of the gear have an inclination, and then forming the same tooth. It requires a double operation of rotating and removing the mold base. It is expensive to install equipment that performs such movements, and it is difficult for a company specializing in gears to shorten the time required for the product manufacturing process in mass production. Inefficiency in work has been a problem.
[0006]
Further, from the viewpoint of improving the quality of the finished gear product, the combination of the inclination direction and the rotational movement of the mold is accompanied by an increase in the number of processes, and the gear teeth themselves are damaged at the time of taking out the finished product, and the combination of the injection molding device and the like. There is a problem in that the internal space of the factory for installing the equipment must be large with the expansion of the space of the entire equipment.
[0007]
Therefore, according to the present invention, when the gear product is injection-molded and taken out, the teeth of the gear, which is a molded product, are formed in a curved shape. Gear injection molding equipment that reduces the double-stroke work time for rotating and removing the mold pedestal, reduces equipment costs for shafts and bearings for fixing injection molding dies, and improves work efficiency in gear molding. The purpose is to provide.
[0008]
[Means for Solving the Problems]
The present invention provides a male mold 9a comprising an outer frame 10 and an inner frame 11 and a female mold 9b comprising an inner frame 12, an inner middle frame 13, an outer middle frame 14 and an outer frame 15, in order to solve the above-mentioned problem. In the mold apparatus, a plurality of blades 11d having a tip end bent outward and an inclined surface 12r are provided in an annular shape so as to protrude from the inner wall surface of the mounting pin 11e, and have a circular shape at the center. In addition, a fitting member 13f having a concave cross-sectional shape is attached, a disc-shaped flat plate member 13g is fitted into a recess in the fitting member 13f, and the tip of the injection nozzle 13b is disposed in the flat plate member 13g. A hemispherical holding projection 13h for injecting a molding material for molding the gear 17 from 13b and forming a molding space 13e is cross-shaped at positions above, below, left and right of the injection nozzle 13b on the surface of the flat plate member 13g. Provide Both are provided with an inner frame 11 provided with a cooling member 11c and an L-shaped water passage hole 10c therein, which is connected to the cooling member 11c of the inner frame 11 via a connecting member 11b communicating with the water passage hole 10c. A male mold 9a composed of an outer frame 10 having a shape larger than the inner frame 11 provided with a filling hole 10b having an injection passage 13a having a diameter increasing toward the tip, and absorbing a shock at each corner of the surface. And a first protruding pin 12a is protruded from each corner, and a pedestal 12i is attached to the center of the surface, and the protruding portion 12j of the blade 11d of the male mold 9a is fitted. A U-shaped fitting groove 12d having a surface 12t is formed, guided by a guide rod 12k, and a plurality of tooth forming dies 12g having a concave portion 12o and a convex portion 12p formed at an end thereof are removed. The inner frame 12 having the coil spring 12h mounted between the pedestal 12i and the tooth forming mold 12g, the inner and inner frames 13 and the recess 14f which are in close contact with the inner frame 12 are formed at two locations. The holes 14a, 14a are formed in the recesses 14f and fixed to the inside of the recesses 14f. The outer protruding frame 14 provided with the second protruding pins 14c is in close contact with the outer protruding frame 14, and the third protruding pins 14d and the A pin 14e is provided, comprising a female mold 9b comprising an inner frame 12, an inner middle frame 13, and an outer frame 15 having a larger shape than the outer middle frame 14, and projecting from each corner of the inner frame 12 of the female mold 9b. The first projecting pin 12a to be provided is inserted into the insertion hole 12s formed in each corner of the inner frame 11 of the male mold 9s, and the male mold 9a and the female mold 9b are joined and separated. The feature is that you can Of the gear injection mold apparatus 9 to be used.
[0009]
【Example】
Hereinafter, a gear injection mold apparatus according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a perspective view of a gear injection molding apparatus according to the present invention, FIG. 2 is a longitudinal sectional view of the gear injection molding apparatus shown in FIG. 1, and FIG. It is a longitudinal cross-sectional view of a state where the gear is taken out by separating the female mold.
[0010]
4 is a front view of an inner frame of a male mold of the present gear injection molding apparatus, FIG. 5 is a front view of an inner frame of a female mold of the present gear injection molding apparatus, and FIG. The front view of the state where the gear manufactured in the mold device is stored, that is, the movement of the tooth forming mold attached to the inner frame of the female mold constituting the gear injection mold device of the present invention. It is the front view shown.
[0011]
FIG. 7 is a front view of the tooth forming mold constituting the female mold of the gear injection molding mold apparatus, that is, the gear forming mold apparatus is movable to the inner frame of the female mold constituting the gear injection molding mold apparatus of the present invention. FIG. 8 is a front view of a mounted tooth forming mold, FIG. 8 is a front view of a cooling member incorporated in a male mold of the present gear injection molding apparatus, and FIG. 9 is a tooth formation of the present gear injection molding apparatus. FIG. 3 is a plan view of a mold, that is, a plan view of a tooth forming mold movably attached to an inner frame of a female mold constituting the gear injection mold apparatus.
[0012]
FIG. 10 is a front view of a gear molded and manufactured by a gear injection mold apparatus, FIG. 11 is a left side view of a gear molded and manufactured by the present gear injection mold apparatus, and FIG. 12 is a main gear injection mold. It is a longitudinal cross-sectional view of the gear molded and manufactured by the mold device.
[0013]
FIG. 1 is a perspective view of a gear injection molding apparatus according to the present invention, and FIG. 4 is a front view of an inner frame of a male mold constituting the gear injection molding apparatus according to the present invention. As shown in FIG. 1, the gear injection molding apparatus 1 according to the present invention has a substantially cubic shape. The gear injection molding apparatus 1 according to the present invention includes a male mold 1a and a female mold 1b.
[0014]
The gear injection molding apparatus 1 includes a male mold 1a and a female mold 1b. The male mold 1a includes an outer frame 2 and an inner frame 3. The female mold 1b includes an inner frame 4, an inner middle frame 5, an outer middle frame 6, and an outer frame 7.
[0015]
As shown in FIG. 1, the outer frame 2 forming the male mold 1a has a rectangular parallelepiped shape. Each corner of the outer frame 2 is provided with holes 2a, 2a, 2a, 2a. The outer frame 2 and the inner frame 3 are joined by bolts. In the center of the outer frame 2, a filling hole 2b for filling the material of the injection molded product is formed.
[0016]
As shown in FIG. 1, the outer frame 2 constituting the male mold 1a is larger than the inner frame 3. This is to make the filling hole 2b of the outer frame 2 and the injection passage 5a shown in FIG. 2 less susceptible to the generation of heat due to the filling of the material, and to facilitate the maintenance accompanying the replacement of parts. .
[0017]
FIG. 4 shows the structure of the inner surface of the male mold 1a. As shown in FIG. 4, a large number of annular projections 4j, 4j are provided on the inner surface of the inner frame 3 constituting the male mold 1a, outside the injection nozzle 5b connected to the filling hole 2b shown in FIG. , 4j, 4j, 4j, 4j, 4j, 4j, 4j, 4j, 4j, 4j are protruding.
[0018]
, A large number of holes 3g, 3g, 3g,... Are formed in a ring shape outside the many projections 4j, 4j, 4j, 4j, 4j, 4j,. On the other hand, a large number of holes 3h, 3h, 3h.
[0019]
As shown in FIG. 4, an injection nozzle 5b provided at the center of the male mold 1a injects an injection material filled in a gear injection-molded by the gear injection molding apparatus 1 according to the present invention. Nozzle.
[0020]
As shown in FIG. 1, holes 3a, 3a provided on the upper surface 3b of the inner frame 3 constituting the male mold 1a are holes for inserting a detection rod for detecting a temperature, and are used for injection products (gears). The temperature during molding is detected by inserting a detection rod during molding.
[0021]
As shown in FIG. 1, an outer frame 7 is joined to an outer middle frame 6 constituting the female mold 1b, and a recess 6f is formed in the outer middle frame 6, and a bolster 6b is provided in the recess 6f. Fixed. Reference numerals 6a and 6a indicate holes.
[0022]
The bolster 6b is for increasing the structural strength of the gear injection molding apparatus 1. The gap 6g formed when the bolster 6b is installed has a function of discharging heat generated by the movement of the second protruding pin 6c and the third protruding pin 6d and cooling the same.
[0023]
FIG. 2 is a longitudinal sectional view of the gear injection molding apparatus shown in FIG. 1 in a state where a male mold and a female mold are joined. As shown in FIG. 2, the male mold 1a and the female mold 1b can be joined and can be separated.
[0024]
The outer frame 2 of the male mold 1a is joined to the inner frame 3 by bolts, and the first projecting pin 4a fixed to the male mold 1a is inserted into a hole formed in the female mold 1b. The male mold 1a and the female mold 1b fit and come into close contact with each other.
[0025]
In the outer frame 2 of the male mold 1a, a water flow hole 2c for flowing cooling water is formed toward a filling hole 2b provided in the center. That is, the water passage hole 2c extends to a position close to the filling hole 2b. The water passage 2c is connected to a water passage 3i formed in the cooling member 3c.
[0026]
As shown in FIG. 2, there is an inner frame 4 of the female mold 1b which is in close contact with the inner surface of the inner frame 3 of the male mold 1a. An outer frame 6 is attached to the outside, and an outer frame 7 is attached to the outside of the outer frame 6.
[0027]
The outer frame 7 has a shape that is generally larger than the outer middle frame 6. This is to facilitate separation of the outer middle frame 6 and the outer frame 7, and to facilitate maintenance management of the second protruding pin 6c, the third protruding pin 6d, the fourth protruding pin 6e, and the like.
[0028]
As shown in FIG. 2, the place where the material for molding the gear 8 which is an injection molded product is filled is the filling hole 2 b, and the diameters of the injection passages 5 a communicating with the filling hole 2 b are not all the same. The diameter is formed larger toward the tip. Reference numeral 5b is an injection nozzle 5b.
[0029]
As shown in FIG. 2, the inner frame 3 has mounting pins 3e, 3e. The blade 3d is fixed to the mounting pins 3e, 3e, and the tip of the blade 3d protrudes to form a projection 4j.
[0030]
The tips of the projections 4j, 4j formed integrally with the blade 3d are bent in the direction opposite to the position where the gear 8, which is a molded product, is located. That is, it is bent outward. The protrusions 4j, 4j are fitted in a U-shaped fitting groove 4d formed between the fixed mold 4b and the tooth forming mold 4g in the inner frame 4 of the female mold 1b. Reference numeral 3f is an O-ring.
[0031]
When the projections 4j, 4j are fitted into the fitting grooves 4d, 4d, since the rear end of the tooth forming mold 4g is the inclined surface 4s formed in a tapered shape, the inclined surface 4r of the projection 4j is toothed. The tooth forming die 4g fits in contact with the inclined surface 4s formed at the rear end of the forming die 4g, so that the entire tooth forming die 4g slides in the direction of arrow a, that is, the direction in which the gear 8 is located.
[0032]
At this time, the compression coil springs 4h, 4h are in a state of being contracted by being pushed in the direction of the pedestal 4i. The material injected from the injection nozzle 5b from the injection passage 5a into the molding space 5e formed by the upper lid 5f, the tooth forming mold 4g, the Y-shaped coma (convex portion 4f) and the pedestal 4i is formed through the injection passage 5a. Reaching the space 5e, the outer shape of the gear 8 and the teeth 8c of the gear 9 are formed.
[0033]
FIG. 3 is a longitudinal sectional view showing a state in which a gear as a molded product is taken out by the gear injection mold apparatus according to the present invention. That is, it is a diagram showing a state where the male mold 1a and the female mold 1b are separated. As shown in FIG. 3, when the male mold 1a and the female mold 1b separate from each other, the projection 4j fitted in the fitting groove 4d comes off from the fitting groove 4d. Reference numeral 4a denotes a first projecting pin, which guides the male mold 1a and the female mold 1b to separate.
[0034]
When the projection 4j is detached from the fitting groove 4d, the tooth forming mold released from the state in which the inclined surface 4s formed on the tooth forming mold 4g is pressed by the inclined surface 4r formed on the projection 4j. 4g slides in the direction of arrow b due to the elastic force of the compression coil spring 4h locked on the tooth forming mold 4g.
[0035]
In this way, when the tooth forming mold 4g moves in the direction of the arrow b, the tooth forming mold 4g is separated from the gear 8, so that the molded gear 8 can be taken out. The gear 8 is taken out by pushing out the gear 8 with the second projecting pins 6c, 6c.
[0036]
FIG. 5 is a front view of an inner frame of a female mold constituting the gear injection molding apparatus according to the present invention, and FIG. 6 is attached to an inner frame of a female mold constituting the gear injection molding apparatus according to the present invention. FIG. 7 is a front view showing the movement of the tooth forming mold being mounted, and FIG. 7 is a front view showing the tooth forming mold movably attached to the inner frame of the gear injection molding apparatus according to the present invention. 9 is a plan view of the tooth forming mold movably attached to the inner frame of the female mold constituting the gear injection molding mold apparatus according to the present invention, and is a plan view from the direction of arrow C in FIG. It is.
[0037]
As shown in FIG. 5, on the surface of the inner frame 4 constituting the female mold 1b, a large number of tooth forming molds 4g, 4g, 4g, 4g, 4g, 4g, 4g, 4g, 4g, 4g, 4g, and 4g slide in the direction of the center portion 5c and are slidably mounted in the direction of the arrow c.
[0038]
As shown in FIG. 5 and FIG. 6, the tooth forming molds 4 g, 4 g, 4 g, 4 g, 4 g, 4 g, 4 g, 4 g, 4 g, 4 g, 4 g, 4 g, 4 g, 4 g, 4 g are fitted outside. There are mating grooves 4d, 4d, 4d, 4d, 4d, 4d, 4d, 4d, 4d, 4d, 4d, 4d. That is, the fitting groove 4d is formed between the fixed mold 4b and the tooth forming mold 4g. Each tooth forming die 4g is about to move outward because a force to slide in the direction of the fitting groove 4d is always exerted by the elastic force of the coil spring 4h.
[0039]
As shown in FIG. 7, guide bars 4k and 4k are provided on the left and right of the tooth forming mold 4g, and are guided by the guide bars 4k and 4k so as not to swing when the tooth forming mold 4g moves. The guide rods 4k, 4k are fixed to the inner frame 4 by bolts 41, 41. Reference numeral 4m indicates the first mold hole 4m, and reference numeral 4n indicates the second mold hole 4n.
[0040]
FIG. 8 is a front view of a cooling member incorporated in the male mold of the gear injection molding machine according to the present invention. As shown in FIG. 8, the cooling member 3c has a cylindrical shape, has a center screw 2d at the center, and has a U-shaped cooling panel at the center. The passage opening 2e communicates with the water hole 2c.
[0041]
As shown in FIG. 9, irregularities for molding the teeth 8c of the gear 8 are formed on the tooth forming mold 4g. The concave portions 4q and the convex portions 4f for forming the teeth are alternately formed, and a plurality of the concave portions 4q and the convex portions 4f are vertically formed between the upper mold 4o and the lower mold 4p.
[0042]
FIG. 10 is a front view of a gear molded by the gear injection mold apparatus of the present invention, FIG. 11 is a left side view of a gear molded by the gear injection mold apparatus of the present invention, and FIG. FIG. 3 is a longitudinal sectional view of a gear molded by a gear injection molding die apparatus.
[0043]
As shown in FIGS. 10, 11 and 12, the gear 8 molded and manufactured by the gear injection molding apparatus according to the present invention has a metal ring 8d having a through hole 8a formed at the center. . Teeth 8c are formed outside the metal ring 8d. Reference numeral 8b indicates a continuous portion, and reference numeral 8e indicates a fitting portion.
[0044]
FIGS. 13 to 25 show another embodiment of the gear injection mold apparatus according to the present invention. FIGS. 26 to 31 show gears manufactured by the gear injection mold apparatus of this embodiment. FIG. 32 is a diagram showing a state of use of a gear manufactured by the gear injection molding die apparatus of the present example.
[0045]
13 is a perspective view of the gear injection molding apparatus of the present embodiment, FIG. 14 is a front view of an inner frame of a male mold of the gear injection molding apparatus of the present embodiment, and FIG. 15 is a gear injection mold of the present embodiment. FIG. 16 is a front view of an inner frame of a female mold of the apparatus, FIG. 16 is a longitudinal sectional view in which a cooling member is incorporated in a male mold of the gear injection molding apparatus of the present embodiment, and FIG. 17 is gear injection molding of the present embodiment. It is a front view of the cooling member incorporated in the male mold of a mold apparatus.
[0046]
FIG. 18 is a longitudinal sectional view of the gear injection molding apparatus of the present embodiment in which the male mold and the female mold are in close contact with each other to form a gear, and FIG. 19 is a female view of the gear injection molding apparatus of the present embodiment. FIG. 20 is a front view showing the movement of the inner frame of the mold, FIG. 20 is a longitudinal sectional view showing a state in which the male mold and the female mold of the gear injection molding apparatus of the present example are separated and the gear is taken out, and FIG. It is the front view which showed the movement of the inner frame of the female mold | die of the gear injection molding die apparatus of this example.
[0047]
FIGS. 22 and 23 show a tooth forming mold for forming a gear tooth mold. FIG. 22 is a front view of a tooth forming mold attached to an inner frame of a female mold constituting a male mold of the gear injection molding apparatus of the present embodiment, and FIG. 23 is a gear injection molding apparatus of the present embodiment. FIG. 3 is a plan view of a tooth forming mold attached to an inner frame of the female mold of FIG.
[0048]
FIGS. 24 and 25 are views showing the positions of water holes provided inside the male mold and the female mold of the gear injection molding mold apparatus of the present example. FIG. 24 is a front view showing the positions of water holes provided in the male mold of the gear injection molding apparatus of the present example, and FIG. 25 is provided in the female mold of the gear injection molding apparatus of the present example. FIG. 5 is a front view of a water passage hole provided.
[0049]
FIG. 26 is a front view of a gear molded and manufactured by the gear injection mold apparatus of the present embodiment, FIG. 27 is a left side view of the gear molded and manufactured by the gear injection mold apparatus of the present embodiment, and FIG. FIG. 29 is a front view of a metal ring incorporated in a gear molded and manufactured by the gear injection molding apparatus of the present embodiment, FIG. 29 is a left side view of the metal ring, and FIG. 30 is a metal ring shown in FIG. It is a longitudinal cross-sectional view along the BB line.
[0050]
FIG. 31 is a longitudinal sectional view of the gear manufactured by the gear injection molding die device of the present example, taken along AA shown in FIG. 26. FIG. 32 is a front view of a partial cross section in a state where a gear molded by the gear injection molding die apparatus of the present example is incorporated and used.
[0051]
13 is a perspective view of the gear injection molding apparatus, FIG. 14 is a front view of an inner frame of a male mold of the gear injection molding apparatus, and FIG. 15 is a female mold of the gear injection molding apparatus of the present example. It is a front view of the inner frame of a type | mold. As shown in FIG. 13, the gear injection molding apparatus 9 of this example has a substantially cubic shape. The gear injection molding apparatus 9 of the present embodiment includes a male mold 9a and a female mold 9b.
[0052]
In the gear injection molding die apparatus 9 of this embodiment, the male die 9a is composed of an outer frame 10 and an inner frame 11, and the female die 9b is composed of an inner frame 12, an inner middle frame 13, an outer middle frame 14, and an outer frame 15. Consists of
[0053]
As shown in FIG. 13, an insertion hole 11a is formed in the upper surface of the inner frame 11 constituting the male mold 9a, and is a hole for inserting a detection rod for detecting water temperature. A detection rod is inserted at the time of molding of No. 17 to provide temperature control for each situation such as injection of molding material, molding, and removal.
[0054]
As shown in FIG. 13, the outer frame 10 constituting the male mold 9a has a rectangular parallelepiped shape, and each corner of the outer frame 10 is provided with holes 10a, 10a, 10a, 10a. The outer frame 10 and the inner frame 11 are joined by bolts. A filling hole 10b for filling the material of the injection molded product is formed in the center of the outer frame 10.
[0055]
The outer frame 10 is larger than the inner frame 11. This is to make the filling hole 10b of the outer frame 10 and the injection passage 13a shown in FIG. 16 less susceptible to the generation of heat due to the material filling, and to facilitate the maintenance associated with component replacement. .
[0056]
As shown in FIG. 14, the internal structure of the male mold 9a has an annular shape on the inner surface of the inner frame 11 constituting the male mold 9a, outside the injection nozzle 13b communicating with the filling hole 10b shown in FIG. , A large number of projecting portions 12j, 12j, 12j,...
[0057]
The inner surfaces of the projections 12j, 12j, 12j,..., That is, the inner surfaces facing the direction of the injection nozzle 13b are formed in a tapered shape. Also, one of the multiple protrusions 12j, 12j,... Protruding annularly has a smaller width than the other protrusions 12j.
[0058]
.. Are formed in a ring shape so as to surround the protrusions 12j, 12j,... Outside the many protrusions 12j, 12j,. Also, a number of holes 11h, 11h, 11h,... Are formed in an annular shape inside the protruding portions 12j, 12j, 12j,. Holes 11g and 11h are bottomed holes.
[0059]
As shown in FIG. 13, an outer frame 15 is joined to the outside of the outer middle frame 14 constituting the female mold 9b, and a recess 14f is formed in the outer middle frame 14, and a pillow is provided in the recess 14f. The beam 14b is fixed. Holes 14a, 14a are formed in two places in the bolster 14b.
[0060]
The bolster 14b is for increasing the strength of the structure of the gear injection molding apparatus 9. The gap 14g formed when the bolster 14b is installed has a function of cooling by releasing heat generated by the vertical movement of the second projecting pin 14c, the third projecting pin 14d, and the like.
[0061]
As shown in FIG. 14, a fitting member 13 f that is formed in a circular shape and has a concave cross-sectional shape is attached to the center of the inner frame 11. A disc-shaped flat plate member 13g is fitted into the recess in the fitting member 13f. The flat plate member 13g has the tip of the injection nozzle 13b, and has cross-shaped holding projections 13h at positions above, below, left, and right of the injection nozzle 13b.
[0062]
The holding projections 13h, 13h,... Formed on the surface of the flat plate member 13g hold the metal ring 17a of the gear molded into the male mold 9a, and the injection material injected from the injection nozzle 13b is the metal ring 17a. It is a projection for forming a gap filled in the outer side surface.
[0063]
As shown in FIG. 13, the injection nozzle 13b provided at the center of the holding projection 13h is a nozzle for injecting an injection material for molding the gear 17 by the gear injection molding apparatus 9 of the present embodiment. .
[0064]
As shown in FIG. 15, a large number of tooth forming dies 12g, 12g, 12g, 12g,... Radiate from a central core member 13c on the surface of the inner frame 12 constituting the female mold 9b. It is mounted so that it can slide outward.
[0065]
The fitting grooves 12d, 12d, 12d, 12d, 12d,... Are formed at the rear part of the tooth forming molds 12g, 12g, 12g, 12g,.
[0066]
As shown in FIG. 15, the tooth forming mold 12g is constantly pushed back in the direction of arrow c by the elastic force of the coil springs 12h, 12h, 12h. Of course, the tooth forming molds 12g, 12g,... Also move toward the center of the female mold 9b.
[0067]
In addition, first protruding pins 12a, 12a, 12a, 12a protrude from each of the four corners on the surface of the inner frame 12. In addition, shock absorbing pins 12e, 12e, 12e, 12e for absorbing a shock are provided at four positions near the first protruding pin 12a. The shock absorbing pins 12e, 12e, 12e, 12e are pins for absorbing a shock generated when the male mold 9a and the female mold 9b come into close contact with each other.
[0068]
FIG. 16 is a longitudinal sectional view of the gear injection molding apparatus of the present embodiment, and FIG. 17 is a front view of a cooling member incorporated in the male mold of the gear injection molding apparatus of the embodiment. Hereinafter, the internal structure of the gear injection molding die apparatus 9 of the present example will be described.
[0069]
As shown in FIG. 16, the gear injection molding apparatus 9 of the present embodiment is used for molding a gear by using a male mold 9a and a female mold 9b in close contact with each other. A cooling member 11c is incorporated in the gear injection molding die apparatus 9 of the present embodiment in order to prevent the gear from being heated and heated when injection molding the gear.
[0070]
An inner frame 11 is joined to the outer frame 10 of the male mold 9a by a bolt, an adhesive or the like. The first protruding pins 12a, 12a, 12a, 12a fixed to the female mold 9a are inserted into the insertion holes 12s, 12s, 12s, 12s formed in the male mold 9b and fitted to each other to fit. . Are sandwiched between the cooling member 11c and the injection passage 13a.
[0071]
A water passage hole 10c for flowing cooling water is formed in the outer frame 10 so as to linearly descend from the upper end of the outer frame 10 toward the filling hole 10b. Further, the water passage hole 10c extends to a position close to the filling hole 10b. The water passage hole 10c is formed in the outer frame 10 in an L shape. Similarly, a water passage hole 10c is formed in an L shape so as to rise from the lower end of the outer frame 10 toward the filling hole 10b.
[0072]
As shown in FIG. 16, the water passage hole 10c formed from the upper end of the outer frame 10 and the water passage hole 10c formed from the lower end of the outer frame 10 are connected to the connecting member 11b and the circle shown in FIG. It communicates via the cooling member 11c formed in the shape.
[0073]
There is an inner frame 12 of the female mold 9b in close contact with the inner surface of the inner frame 11 of the male mold 9a, an inner middle frame 13 outside the inner frame 12, and an outer middle frame outside the inner middle frame 13. An outer frame 15 is attached to the frame 14 outside the outer middle frame 14.
[0074]
The outer frame 15 constituting the female mold 9b has a shape that is larger than the outer middle frame 14 as a whole. This is to facilitate separation of the outer middle frame 14 and the outer frame 15 and to facilitate maintenance management of the second projecting pin 14c, the third projecting pin 14d, the fourth projecting pin 14e, and the like. The spring 14h absorbs an impact when the male mold 9a and the female mold 9b come into close contact with each other.
[0075]
Next, the mounting position of the cooling member 11c incorporated in the male mold 9a will be described. The cooling member 11c is attached to the distal ends of the connecting members 11b, 11b located at the center of the inner frame 11.
[0076]
FIG. 17 is a front view of the cooling member 11c. The cooling member 11c is formed in a circular shape, and the through hole formed in the center is the tip of the injection nozzle 13b.
[0077]
Further, through holes 10d and 10d are formed in the upper and lower portions of the injection nozzle 13b. The tips of the connecting members 11b, 11b are joined to the through holes 10d, 10d, and the cooling water flowing from one of the water holes 10c flows out of the one of the through holes 10d. The outflowing cooling water flows through the U-shaped groove 11i formed in the cooling member 11c, flows out of the other through hole 10d, flows in the other connecting member 11b, and flows out of the other water passage hole 10c.
[0078]
In this manner, the fitting member 13f, the flat plate member 13g, and the like, which are heated by the high heat generated when the gear 17 is formed by flowing the cooling water, can be cooled. Thus, the molding time of the gear 17 can be reduced by incorporating the cooling structure into the male mold 9a.
[0079]
FIG. 18 is a longitudinal sectional view of the gear injection molding apparatus of the present example in which the male mold and the female mold are in close contact with each other and a gear is being molded. As shown in FIG. 18, when molding the gear 17, it is necessary to make the male mold 9a and the female mold 9b adhere to each other.
[0080]
Before the male mold 9a and the female mold 9b are brought into close contact with each other, a metal base material of the gear 17 molded on the pedestal 12i fixed to the core member 13c at the center of the female mold 9b with the screw 12m is used. Of the metal ring 17a is set. Thereafter, the male mold 9a and the female mold 9b are moved, and the pedestal 12i on which the metal ring 17a fixed to the female mold 9b is set and the fitting member 13f fixed to the male mold 9a. The molding space 13e into which a molding material for molding the gear 17 is injected and injected by forming the molding space 13e is formed.
[0081]
As shown in FIG. 18, the injection molding material injected and injected to mold the gear 9 is fed from the filling hole 10b through the injection passage 13a through the injection hole 13b, and the metal is injected from the injection nozzle 13b. It is injected and injected outside the ring 17a. The diameters of the injection passages 13a communicating with the filling holes 10b are not all the same, but are formed larger toward the tip.
[0082]
As shown in FIG. 18, a blade 11d is attached to the inner frame 11 of the male mold 9a by a mounting pin 11e such that the tip of the blade 11d protrudes from the inner wall surface of the inner frame 11). The protruding portion 12j at the tip of the blade 11d is bent outward.
[0083]
Next, a protruding portion 12j protruding from the inner wall surface of the inner frame 11 at the tip of the blade 11d provided on the inner frame 11 is bent outward. The protruding portion 12j fits into a U-shaped fitting groove 12d formed in a tooth forming mold 12g movably attached to the inner frame 12 of the female mold 9b.
[0084]
When the protruding portion 12j of the blade 11d is fitted into the fitting groove 12d formed in the tooth forming mold 12g, the rear end of the tooth forming mold 12g is a tapered inclined surface 12r. As the inclined surface 12r of the protruding portion 12j is fitted while being in contact with the inclined surface 12t formed in the fitting groove 12d formed at the rear of the tooth forming mold 12g, the entire tooth forming mold 12g is fitted. Moves in the direction of arrow a, that is, the direction in which the fitting member 13f and the pedestal 12i are located.
[0085]
At this time, the coil spring 12h is pressed and shrunk in the direction of the pedestal 12i. The flat plate member 13g is fitted in the fitting member 13f having a U-shaped cross section.
[0086]
A molding space 13e for molding the gear 17 is surrounded by the hemispherical holding projections 13h, 13h provided on the flat plate member 13g, the tooth forming mold 12g, the upper and lower Y-shaped tops 18c, 18c, and the pedestal 12i. Can be. An injection molding material as a material of the gear 17 is injected into the molding space 13e.
[0087]
As shown in FIG. 18, in a molding space 13e formed for molding the gear 17, a metal ring 17a is set in the center of the pedestal 12i in advance, and the gear 17 is molded via the injection passage 13a. Injection molding material is filled in the molding space 13e, and the teeth 17c, the interlocking portion 17b, the base 17d, etc. of the gear 17 are molded.
[0088]
When it is desired to mold and manufacture a gear having a different shape of the teeth 17c of the gear 17, a different tooth forming mold is attached by replacing the tooth forming mold attached to the tip of the tooth forming mold 12g. Thus, the tooth shape formed on the gear 17 can be a desired tooth shape.
[0089]
FIG. 19 is a front view showing the movement of the tooth forming mold attached to the inner frame of the female mold constituting the gear injection mold apparatus of the present example. As shown in FIG. 19, a tooth forming mold 12g is radially attached to the inner frame 12 constituting the female mold 9b so as to surround the pedestal 12i. The injection molding material is injected into the outer periphery of the metal ring 17a set on the core member 13c at the center, and the gear 17 is molded.
[0090]
The fitting grooves 12d, 12d, 12d,... Formed in the tooth forming molds 12g, 12g,. , 12j,... Are fitted, the plurality of tooth forming dies 12g, 12g, 12g,... Which are radially attached press the coil spring 12h mounted between the pedestal 12i and the tooth forming mold 12g. Move in the direction of the core member 13c, that is, as indicated by the arrow c.
[0091]
FIG. 20 is a longitudinal sectional view showing a state in which the male mold and the female mold of the gear injection mold apparatus of the present embodiment are separated from the state in which the male mold and the female mold are in close contact, and the molded gear is taken out, and FIG. It is the front view which showed the movement of the tooth formation die attached to the inner frame of the female mold of an injection molding die apparatus.
[0092]
As shown in FIG. 20, the protruding portion 12j of the blade 11d attached to the male mold 9a by the attaching pin 11e is disengaged from the fitting groove 12d formed in the tooth forming mold 12g of the female mold 9b. When removed, the inclined surface 12r formed on the protruding portion 12j separates from the protruding portion 12j of the blade 11d while pressing the inclined surface 12t formed on the tooth forming die 12g by the inclined surface 12r. It moves in the direction of arrow b due to the resiliency of a coil spring 12h attached between the tooth forming die 12g and the tooth forming die 12g.
[0093]
Then, when the entire tooth forming mold 12g moves in the direction of arrow b, the tip of the tooth forming mold 12g separates from the teeth 17c of the molded gear 17, as shown in FIG.
[0094]
As described above, after the tooth forming mold 12g separates from the teeth 17c of the gear 17, the second protruding pins 14c, 14c move and push out the continuous portion 17e of the molded gear 17, thereby being molded from the pedestal 12i. The gear 17 is taken out.
[0095]
As shown in FIG. 21, when the tooth forming dies 12g, 12g, 12g,... Move in the direction of arrow c by the elastic force of the coil springs 12h, 12h, 12h,. The tip of the tooth forming mold 12g is separated from the teeth 17c of the gear 17. Therefore, the gear 17 can be removed from the molding space 13e at any time by being pushed by the second protruding pins 14c, 14c.
[0096]
FIG. 22 is a front view of a tooth forming mold that forms an inner frame of a female mold of the present gear injection mold apparatus. FIG. 23 is a plan view of the tooth forming die attached to the inner frame of the female die of the gear injection molding die device.
[0097]
As shown in FIG. 22, the tooth forming mold 12g has a substantially trapezoidal shape, and substantially rectangular guide grooves 12u, 12u are formed on the left and right of the tooth forming mold 12g. Further, circular holes 12n are formed in the center and the rear.
[0098]
Guide rods 12k, 12k are accommodated in the left and right guide grooves 12u, 12u, and the guide rods 12k, 12k are fixed to the inner frame 12 of the female mold 9b by bolts 12l. The guide rods 12k, 12k guide the tooth forming mold 12g so as not to swing when it moves. The guide rods 12k, 12k are fixed to the inner frame 12 by bolts 12l.
[0099]
As shown in FIG. 22, circular holes 12n, 12n formed in the tooth forming mold 12g are grooves for forming fitting grooves when the male mold 9a and the female mold 9b are in close contact with each other. is there. The tip 12q to which the coil spring 12h is attached is formed in a curved shape, and an uneven portion 12f for forming teeth 17c of the gear 17 is formed inside the tip.
[0100]
As shown in FIG. 23, at the tip 12q of the tooth forming mold 12g, as described above, the uneven portion 12f for molding the teeth 17c of the gear 17 is formed, but the injection molding material is injected and filled. The concave portions 12o and the convex portions 12p are formed alternately.
[0101]
FIGS. 24 and 25 are views showing the positions of water holes provided inside the male mold and the female mold of the gear injection molding mold apparatus of the present example. FIG. 24 is a front view showing the positions of water holes provided in the male mold of the gear injection molding apparatus of the present example, and FIG. 25 is provided in the female mold of the gear injection molding apparatus of the present example. FIG. 5 is a front view of a water passage hole provided.
[0102]
As shown in FIG. 24, a cooling member 11c is mounted behind the fitting member 13f and the flat plate member 13g of the male mold 9a. Water holes 10c and 10c for flowing cooling water are provided inside the male mold 9a and communicate with each other via a cooling member 11c having a U-shaped groove 11i. In FIG. 24, the water holes 10c and 10c are provided with the male mold 9a in the vertical direction, but, of course, the water holes 10c and 10c may be provided in the horizontal direction.
[0103]
As shown in FIG. 25, similarly to the male mold 9a, the female mold 9b is provided with water passage holes 10c and 10c in the lateral direction, and the cooling member 11c is attached behind the pedestal 12i. I have. The water holes 10c and 10c communicate with each other via a U-shaped groove 11i formed in the cooling member 11c. The water holes 10c, 10c are provided with the female mold 9b in the horizontal direction, but, of course, the water holes 10c, 10c may be provided in the vertical direction.
[0104]
FIGS. 26 to 31 show gears molded and manufactured by the gear injection mold apparatus of the present example. FIG. 26 is a front view of a gear formed by the gear injection molding apparatus of this embodiment, and FIG. 27 is a left side view of a gear formed by the gear injection molding apparatus of this embodiment.
[0105]
As shown in FIG. 26, the gear 17 includes a circular metal ring 17a and a toothed portion 17b formed on the outer periphery of the metal ring 17a. The meshing portion 7b includes a fitting portion 17f, a continuous portion 17e, and teeth 17c.
[0106]
There is a circular through hole 16 at the center of the metal ring 17a. When the metal ring 17a is set on the pedestal 12i of the inner frame 12 of the female mold 9b in order to inject the injection molding material to form the gear 17, the circular core member 13c shown in FIG. Is a through-hole for insertion. A plurality of teeth 17c having a trapezoidal cross section project annularly from the outer periphery of the toothed portion 17b. The fitting portion 17f of the engagement portion 17b is formed integrally with the outer periphery of the metal ring 17a.
[0107]
As shown in FIG. 26, the meshing portion 17b is arranged in the order of the fitting portion 17f, the inclined portion 17i, the connecting portion 17e, the inclined portion 17g, the base portion 17d, and the teeth 17c from the position of the metal ring 17a outward. It is molded. As shown in FIG. 20, the continuous portion 17e has left and right recesses 17h and 17j so that the second projecting pin can easily enter when the gear 17 is pushed out.
[0108]
FIG. 27 is a left side view of the gear molded by the second embodiment of the present gear injection molding die apparatus. As shown in FIG. 27, in the gear 17, the fitting portion 17f formed on the outer peripheral surface of the metal ring 17a has a width wider than the width of the teeth 17c, and protrudes from the left and right of the teeth 17c. Reference numerals 17n and 17p denote inclined portions formed on both surfaces of the tooth 17c, reference numeral 17o denotes a root of the surface of the base 17d of the tooth 17c, and reference numeral 17q denotes a tip of the tooth 17c.
[0109]
The gear 17 molded by the gear injection molding apparatus 9 according to the present invention is characterized in that the tips of the teeth 17c are formed in a wavy shape. There is a concave portion 17l in which the center of the tip of the tooth 17c of the gear 17 is formed in a concave shape, a left projecting portion 17k is formed on the left side of the concave portion 17l, and a right projecting portion 17m is formed on the right side of the concave portion 17l. Is formed. The longitudinal cross-sectional shape of the teeth 17c is substantially triangular and is formed wider as approaching the base 17d.
[0110]
FIG. 28 is a front view of a metal ring incorporated in a gear molded by the gear injection molding die apparatus of this embodiment, and FIG. 29 is incorporated in a gear molded by the gear injection molding apparatus of this embodiment. FIG. 30 is a longitudinal sectional view along the line BB of the metal ring of the gear formed by the gear injection molding die apparatus of the present embodiment.
[0111]
The material of the metal ring 17a is a metal ring made of a lightweight and strong material. A through hole 16 is formed in the metal ring 17a.
[0112]
As shown in FIGS. 29 and 30, a U-shaped fitting groove 17s is formed in the center of the outer peripheral surface 17r of the metal ring 17a. Numerous irregularities are formed on the surface of the left outer peripheral surface 17t on the left side of the fitting groove 17s and the right outer peripheral surface 17u on the right side of the fitting groove 17s. The countless irregularities are for preventing the fitting portion 17f from shifting when the injection molding material forms the fitting portion 17f.
[0113]
FIG. 31 is a longitudinal sectional view taken along the line AA shown in FIG. 26 of the gear according to the second embodiment of the present gear injection molding die apparatus. As shown in FIG. 31, the engagement portion 17b formed of an injection molding material on the outer peripheral surface of the metal ring 17a is in the order of the fitting portion 17f, the continuous portion 17e, the base 17d, and the teeth 17c from below.
[0114]
The lower part of the center of the fitting portion 17f is fitted into a fitting groove 17s formed on the outer peripheral surface 17r of the metal ring 17a. The right and left upper surfaces of the fitting portion 17f have tapered inclined portions 17i, 17i. A continuous portion 17e is formed so as to rise from the center of the upper portion of the fitting portion 17f.
[0115]
A recess 17h is formed on the left and right of the continuous portion 17e, and a recess 17j is also formed on the right. The recess 17h is a place where the second projecting pin 14c pushes when the gear 17 is taken out after being molded by the gear injection molding die apparatus 9 of the present example.
[0116]
A base 17d wider than the continuous portion 17e is formed on the continuous portion 17e, and teeth 17c including left and right projecting portions 17k and 17m and a concave portion 17l are formed on the base 17d.
[0117]
FIG. 32 is a front view of a state in which a gear molded by the gear injection molding die apparatus of the present example is incorporated and used. As shown in FIG. 32, a state in which the gear 17 manufactured by the injection molding die apparatus 9 of this example is incorporated in the gear box 19 is shown.
[0118]
The gearbox 19 is installed in an engine room at the front of the automobile. The gearbox 19 includes a main shaft 19a and a cylindrical auxiliary shaft 19b.
[0119]
The gear 17 manufactured by the gear injection molding apparatus 9 of this example is mounted inside the main shaft portion 19a shown in FIG.
[0120]
A shaft-shaped worm portion 19c is provided at a lower portion of the gear 17, and the gear 17 is engaged. The main shaft portion 19a is not entirely exposed but is entirely covered with a substantially cylindrical cover 19d. Further, a cover 19e is attached to the auxiliary shaft portion 19b and covered.
【The invention's effect】
[0121]
Since the gear injection molding apparatus according to the present invention has the configuration described above, the gear injection molding apparatus can be quickly moved from the gear injection molding apparatus without damaging the gear manufactured by the gear injection molding apparatus. Can be easily taken out.
[0122]
In addition, since the gear molded from the gear injection molding die apparatus can be removed by one operation, a plurality of removal steps are unnecessary as in the conventional gear injection molding apparatus, and the removal of the gear is not required. Work efficiency is good and work time can be reduced.
[0123]
Further, the gear injection molding die apparatus is extremely small and lightweight, so that it requires a small installation area and is easy to carry.
[0124]
In addition, the gear formed by the present gear injection mold apparatus can be used by being attached to a worm wheel gear connected to an electric power steering of an automobile as an expanded use.
[Brief description of the drawings]
FIG. 1 is a perspective view of a gear injection molding apparatus according to the present invention.
FIG. 2 is a longitudinal sectional view of a gear injection mold apparatus according to the present invention.
FIG. 3 is a longitudinal sectional view showing a state in which a gear as a molded product is taken out by a gear injection mold apparatus according to the present invention.
FIG. 4 is a front view of an inner frame of a male mold included in the gear injection molding apparatus according to the present invention.
FIG. 5 is a front view of an inner frame of a female mold constituting the gear injection mold apparatus according to the present invention.
FIG. 6 is a front view showing a movement of a tooth forming mold attached to an inner frame of a female mold constituting the gear injection molding apparatus according to the present invention.
FIG. 7 is a front view of a tooth forming mold movably attached to an inner frame of a female mold constituting a gear injection molding mold apparatus according to the present invention.
FIG. 8 is a front view of a cooling member incorporated in the male mold of the gear injection molding mold apparatus according to the present invention.
FIG. 9 is a plan view of a tooth forming mold movably attached to an inner frame of a female mold constituting the gear injection molding apparatus according to the present invention, which is taken from the direction of arrow C in FIG. It is a top view.
FIG. 10 is a front view of a gear formed by the gear injection molding apparatus according to the present invention.
FIG. 11 is a left side view of a gear molded by the gear injection molding apparatus according to the present invention.
FIG. 12 is a longitudinal sectional view of a gear molded by the gear injection molding apparatus according to the present invention.
FIG. 13 is a perspective view of another embodiment of the gear injection mold apparatus according to the present invention.
FIG. 14 is a front view of an inner frame of a male mold constituting another embodiment of the gear injection mold apparatus according to the present invention.
FIG. 15 is a front view of an inner frame of a female mold constituting another embodiment of the gear injection mold apparatus according to the present invention.
FIG. 16 is a longitudinal sectional view of another embodiment of the gear injection mold apparatus according to the present invention.
FIG. 17 is a front view of a cooling member incorporated in a male mold of another embodiment of the gear injection molding apparatus according to the present invention.
FIG. 18 is a longitudinal sectional view showing a state in which a male mold and a female mold constituting another embodiment of the gear injection molding mold apparatus according to the present invention are in close contact with each other, a molding material is injected and a gear is molded. It is.
FIG. 19 is a front view showing the movement of the inner frame of the female mold constituting another embodiment of the gear injection mold apparatus according to the present invention.
FIG. 20 is a longitudinal sectional view showing a state where a gear as a molded product is taken out according to another embodiment of the gear injection molding die apparatus of the present invention.
FIG. 21 is a front view showing the movement of the inner frame of the female mold constituting another embodiment of the gear injection molding mold apparatus according to the present invention.
FIG. 22 is a front view of a tooth forming mold movably attached to an inner frame of another embodiment of the gear injection molding apparatus according to the present invention.
FIG. 23 is a plan view of a tooth forming mold in which a gear injection mold apparatus according to the present invention is movably attached to an inner frame of a female mold constituting another embodiment; It is a top view from the arrow C direction.
FIG. 24 is a view showing the arrangement of water holes formed in a male mold which constitutes another embodiment of the gear injection mold apparatus according to the present invention.
FIG. 25 is a front view of a water passage hole attached to a female mold constituting another embodiment of the gear injection mold apparatus according to the present invention.
FIG. 26 is a front view of a gear formed by another embodiment of the gear injection mold apparatus according to the present invention.
FIG. 27 is a left side view of a gear formed by another embodiment of the gear injection molding apparatus according to the present invention.
FIG. 28 is a front view of a metal ring of a gear formed by another embodiment of the gear injection mold apparatus according to the present invention.
FIG. 29 is a left side view of a metal ring of a gear formed by another embodiment of the gear injection molding apparatus according to the present invention.
FIG. 30 is a vertical sectional view taken along line BB of a metal ring of a gear molded by another embodiment of the gear injection mold apparatus according to the present invention.
FIG. 31 is a longitudinal sectional view taken along the line AA shown in FIG. 26 of a gear formed by another embodiment of the gear injection molding apparatus according to the present invention.
FIG. 32 is a partial cross-sectional view showing a state in which a gear molded and manufactured by another embodiment of the gear injection molding die apparatus according to the present invention is incorporated.
[Explanation of symbols]
1 Gear injection molding die equipment
1a Male mold
1b Female mold
2 Outer frame
2a hole
2b Filling hole
2c water hole
2d center screw
2e aisle entrance
3 inner frame
3a hole
3b Top surface
3c Cooling member
3d blade
3e Mounting pin
3f O-ring
3g hole
3h hole
3i water hole
4 inner frame
4a First protruding pin
4b fixed type
4c water hole
4d fitting groove
4e Mold cavity
4f convex part
4g tooth forming mold
4h compression coil spring
4i pedestal
4j protrusion
4k guide rod
4l bolt
4m 1st mold hole
4n 2nd mold hole
4o Upper mold
4p lower mold
4q recess
4r slope
4s slope
5 inner middle frame
5a Injection passage
5b Injection nozzle
5c center
5d protrusion
5e molding space
5f top lid
6 Outer middle frame
6a hole
6b Pillow beams
6c Second protruding pin
6d third protruding pin
6e 4th protruding pin
6f recess
6g gap
7 Outer frame
8 gears
8a Through hole
8b Connecting part
8c teeth
8d metal ring
8e fitting part
9 Gear injection molding equipment
9a Male mold
9b Female mold
10 Outer frame
10a hole
10b Filling hole
10c water hole
10d through hole
11 inner frame
11a insertion hole
11b Connecting material
11c Cooling member
11d blade
11e Mounting pin
11f O-ring
11g hole
11h hole
11i U-shaped groove
12 inner frame
12a First protruding pin
12b rear
12c water hole
12d fitting groove
12e shock absorbing pin
12f Uneven part
12g tooth forming mold
12h coil spring
12i pedestal
12j Projection
12k guide rod
12l bolt
12m screw
12n hole
12o recess
12p convex part
12q tip
12r slope
12s insertion hole
12t slope
12u guide groove
13 Inner-middle frame
13a Injection passage
13b Injection nozzle
13c core member
13d protrusion
13e molding space
13f Fitting member
13g flat plate member
13h Holding projection
14 Outer middle frame
14a hole
14b Pillow
14c Second protruding pin
14d third protruding pin
14e 4th protruding pin
14f recess
14g gap
14h spring
15 Outer frame
16 Through hole
17 Gear
17a Metal ring
17b interlocking part
17c tooth
17d base
17e Connection part
17f fitting part
17g slope
17h Left recess
17i Inclined part
17j Right recess
17k left projection
17l recess
17m right protrusion
17n slope
17o root
17p slope
17q tooth tip
17r outer peripheral surface
17s mating groove
17t Left outer peripheral surface
17u Right outer peripheral surface
18c Y type top
19 Gearbox
19a Main shaft
19b auxiliary shaft
19c worm
19d cover
19e cover

Claims (1)

In a mold apparatus comprising a male mold 9a composed of an outer frame 10 and an inner frame 11 and a female mold 9b composed of an inner frame 12, an inner middle frame 13, an outer middle frame 14, and an outer frame 15,
A plurality of blades 11d, each having a tip bent outward and formed with an inclined surface 12r, are provided in a ring shape so as to protrude from the inner wall surface of the mounting pin 11e, and have a circular shape and a concave sectional shape at the center. A mounting member 13f is attached, a disk-shaped flat plate member 13g is fitted into a concave portion in the fitting member 13f, a tip of the injection nozzle 13b is arranged in the flat plate member 13g, and a gear 17 is formed from the injection nozzle 13b. Hemispherical holding projections 13h for injecting a material to form a molding space 13e are provided in a cross shape above, below, left, and right of the injection nozzle 13b on the surface of the flat plate member 13g, and the cooling member 11c is provided. The provided inner frame 11 is provided with an L-shaped water passage hole 10c therein, and is connected to the cooling member 11c of the inner frame 11 via a connecting member 11b communicating with the water passage hole 10c. A male mold 9a composed of an outer frame 10 having a shape larger than the inner frame 11 provided with a filling hole 10b having an injection passage 13a having a larger diameter, and a shock absorber for absorbing a shock at each corner of the surface. A shock absorbing pin 12e is provided, a first projecting pin 12a is projected from each corner, a pedestal 12i is attached to the center of the surface, and an inclined surface 12t into which the projecting portion 12j of the blade 11d of the male mold 9a fits. A plurality of tooth forming dies 12g having a U-shaped fitting groove 12d formed therein, guided by a guide rod 12k, and having concave portions 12o and convex portions 12p formed alternately at the tips are radially slidable outward. And an inner frame 12 having a coil spring 12h mounted between the pedestal 12i and the tooth forming mold 12g, an inner and inner frame 13 closely contacting the inner frame 12, and a recess 14f. A bolster 14b having holes 14a, 14a formed in two places is fixed in the concave portion 14f, and is closely attached to the outer middle frame 14 provided with the second projecting pin 14c, and the third projecting A pin 14d and a fourth protruding pin 14e, and a female mold 9b comprising an inner frame 12, an inner middle frame 13, and an outer frame 15 having a larger shape than the outer middle frame 14. The inner frame of the female mold 9b is provided. 12 are inserted into the insertion holes 12s formed in the respective corners of the inner frame 11 of the male mold 9s so as to project from the respective corners of the male mold 9s, and the male mold 9a and the female mold 9b are inserted. A gear injection molding apparatus 9 characterized in that it can be joined and separated.

Images