JPH0436526B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a molding device for a block for a carburetor, and more particularly, the present invention relates to a molding device for a block for a carburetor, and more particularly, it uses a thermoplastic resin that has excellent heat resistance, corrosion resistance, etc., is lightweight, and requires less post-processing. This invention relates to a molding device for carburetor blocks.

2. Description of the Related Art Carburetors, which apply the principle of spraying, are commonly used as fuel supply devices in automobile engines. In this case, the carburetor uses the high-velocity airflow generated during the engine's intake stroke to suck out fuel, atomizes the fuel, and mixes it with air to create an air-fuel mixture. After the mixture is sucked into the cylinder,
It is compressed by the piston and ignited by the spark plug, causing combustion. At this time, the piston is pressed by the expansion force within the cylinder, that is, the explosion pressure of the fuel, and the pressing force is converted into rotational force by a crank connected to the piston.

By the way, conventionally, the carburetor body in which the intake passage is formed and valves etc. are arranged is made of metal,
For example, materials made of zinc or aluminum alloy are widely used. That is, the carburetor main body is cast by a die-casting method, and then holes for attaching parts and holes for flow passages are formed, and surfaces for mating with other members are formed by cutting. Here, in order to reduce the number of post-processing steps for drilling the various holes as described above, when casting, a casting hole that enters the cavity defined by the mold is used. Predetermined holes are formed using pins.

Furthermore, when molten metal is supplied to the cavity, the molten metal is injected through a gate communicating with the cavity, so the gate portion of the cavity tends to be at the highest temperature. As a result, when a cast pin is arranged near the gate,
As the temperature rises, there is a risk that the casting pin may bend or seize, causing problems. Therefore, it is practically impossible to provide a cast pin in the vicinity of the gate, and as a result, the number of holes to be drilled in post-processing must increase. Furthermore, secondary processing such as deburring, precision cleaning, and chemical surface treatment to improve corrosion resistance against fuel is required, and the processing operations required to complete the carburetor body are large and complicated. Moreover, in general, it is desired to reduce the weight of engines in automobiles etc. in order to improve fuel efficiency, but when the carburetor body is constructed of metal as in the past,
Even if the type of metal was changed, there was a limit to how much weight could be reduced.

Therefore, in recent years, attempts have been made to injection mold carburetor bodies made of synthetic resins with excellent heat resistance and rigidity, and in this case, thermosetting resins such as phenolic resins are used as the resin material. In other words, by using a resin material that is relatively lightweight, has high corrosion resistance, and is easy to mold as the constituent material for the carburetor body, the carburetor that makes up the engine can be made lighter, and the carburetor body has excellent durability. .

However, since the thermosetting resin such as the phenolic resin is extremely hard, repeated molding of the carburetor body causes wear of the joint part of the mold corresponding to the part where the burr occurs, which is called mold warping. As a result, the drawback of short mold life has been exposed. Furthermore, the mold used in the die-casting method also suffers from heat cracks due to temperature changes, so it cannot be said that the mold has a long lifespan.

The present invention has been made in order to overcome the above-mentioned disadvantages, and as a constituent material of the carburetor body, for example, it has excellent workability and can relatively easily prevent the formation of burrs. Polyphenylene sulfide (PPS), a thermoplastic resin that rarely causes mold warpage due to burrs, is used, while the molding equipment uses a mold containing multiple sliding molds to accommodate the carburetor body. The mold is configured to define a cavity having a shape of The purpose of the present invention is to provide a molding device for a carburetor block that is capable of molding a carburetor body that has excellent heat resistance, corrosion resistance, strength, rigidity, etc., is lightweight, and requires less post-processing by providing a core pin for molding the carburetor. shall be.

The present invention includes a fixed mold, a movable mold that faces the fixed mold and is movable forward and backward relative to the fixed mold, and an inclined rod that is fixed to the fixed mold and is oriented in a direction different from the displacement direction of the movable mold. , at least a member of the present invention that moves forward and backward along the inclined rod from a direction different from the direction of displacement of the movable mold in the space defined by the fixed mold and the movable mold to define a cavity together with the fixed mold and the movable mold. A molding device for molding a carburetor block made of synthetic resin by using one or more sliding molds, the molding device having a recess, the sliding mold and the recess engaging in a sliding state, and a guide block that guides the sliding mold to displace it in the opening/closing direction of the mold and positions the sliding mold by the recess when closing the mold; and at least one of the fixed mold, the movable mold, and the sliding mold. A carburetor block, which is a molded product, has a hole defined therein, and includes a core pin for forming the hole provided in contact with each other or with another abutting portion, and communicates with the cavity. The gate portion for introducing the molten metal into the cavity is provided on the side of the throttle body block constituting the mixture body block of the carburetor.

Next, preferred embodiments of the carburetor block molding apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

1 and 2, reference numeral 10 designates a molding device according to the invention. This molding device 10
is used as an apparatus for injection molding a mixture body block which is a block constituting a carburetor body which will be described later. Note that FIG. 1 shows the molding device 10 in a mold-clamped state, and FIG. 2 shows the molding device 10 in an open state. In this case, the molding device 10 includes a fixed part 12 fixed at a predetermined position, and a movable part 14 that moves forward and backward with respect to the fixed part 12. The fixed part 12 includes a fixed die 16, while the movable part 14 are the movable mold 18 and the sliding mold 20a
20d to 20d (see FIG. 3). That is, the fixed mold 16, the movable mold 18, and the sliding molds 20a to 20d define a cavity 42 for molding the mixture block.

A fixed plate 22 constituting the fixed part 12 is fixed at a predetermined position, and a stepped hole 24 is formed in the center of the fixed plate 22. An adapter 28 having a hole 26 is fixed to the hole 24 using a plurality of bolts 30, and a nozzle member 32 is inserted through the hole 26. In this case, a molten resin supply channel (not shown) is connected to the nozzle member 32. Further, a plate body 36 including a hole 34 through which the nozzle member 32 is loosely passed is joined to the fixed platen 22, and a ring member 38 is fitted to the nozzle member 32. In this case, the nozzle member 32 and the ring member 38 are fitted into the fixed mold 16, and the nozzle member 32
A flow path within the gate portion 40 located at the tip of the gate portion communicates with the cavity 42 . Further, a hole 46 for holding the fixed mold 16 in an inserted state is formed in the engaging body 44 adjacent to the plate 36, and around the hole 46 there are inclined rods 48a, 48b and as shown in the figure. Plant two slanted rods that do not In this case, the inclined rods 48a, 48b and two other inclined rods (not shown) are configured to be oriented toward the movable portion 14 and to spread out from each other. Furthermore, protrusions 50a and 50b are formed at the edge of the engaging body 44 and project toward the movable part 14, and the inclined rods 48a and 48b are formed inside these protrusions 50a and 50b. Engagement members 54a and 54b forming parallel slope portions 52a and 52b are fixed.
Similarly, an engaging member (not shown) forming a slope portion parallel to each of the inclined rods (not shown) is disposed near the inclined rods (not shown). Note that the fixed platen 22, the plate body 36, and the engaging body 44 are integrated with bolts 56.

Next, the configuration of the corner portion of the engaging body 44 will be described with reference to FIG. 4, which is a partially omitted longitudinal cross-sectional view of the vicinity of the end of the molding device 10.

The engaging body 44 has a rectangular shape as a whole, and a protrusion 60 is formed at one corner thereof. The protrusion 60 is integral with the protrusion 50b, is located at one end of the protrusion 50b, and protrudes further toward the movable portion 14 than the protrusion 50b. In addition, protrusions (not shown) similar to the protrusions 60 are also formed at three other corner portions (not shown) of the engaging body 44 . Therefore, a guide rod 62 extending horizontally and having a tapered tip is implanted in the protrusion 60.
Guide rods (not shown) similar to the above are also installed in the protrusions of the other three corners.

The fixed part 12 is constructed as described above, and the movable part 14 will be explained next.

A movable plate 64 constituting the movable part 14 is located parallel to the fixed plate 22, and a relatively large recess 66 is formed in the center of the movable plate 64, and a hole 68 is formed in communication with the recess 66. is formed. An extrusion mechanism 70 for extruding and releasing the product molded within the cavity 42 is disposed within the recess 66. The extrusion mechanism 70 includes extrusion plates 74a and 74b that are integrated by bolts 72, and the extrusion plates 74a and 74b are movable along a guide rod 76 whose one end is fixed to the movable platen 64. It is composed of That is, essentially, a cylinder rod (not shown) inserted into the hole 68 of the movable platen 64 is fixed to the push-out plate 74a, and the push-out plates 74a, 7 are moved by displacement of the cylinder rod.
4b moves forward and backward relative to the fixed part 12 side. In this case, the extrusion plate 74b has a cavity 4.
A push-out pin (not shown) is implanted so that it can be accessed inside the mold 2, and the product is released from the mold under the projecting action of the push-out pin.

Further, a cylinder mechanism (not shown) is connected to the movable platen 64, thereby making the entire movable part 14 movable forward and backward relative to the fixed part 12. A mold holding member 84 is fixed to the vertical surface of the movable platen 64 using bolts 82, and the guide rod 7
6 is fitted into the mold holding member 84. As shown in FIG. 3, the mold holding member 84 has an approximately rectangular shape as a whole, and a recess 86 shown in FIG. 1 is formed in the center of the mold holding member 84. The movable mold 18 is fixed. In this case, the movable mold 18 includes a core pin 90 that projects into the cavity 42. In addition, the mold holding member 84
Concave portions 92a and 92b are formed near the ends of the rods, into which the tip portions of the inclined rods 48a and 48b fit loosely, and
Similarly, a recess (not shown) into which the two not-shown inclined rods enter is also formed.

Furthermore, as shown in FIGS. 3 and 4, holes 94a to 94d are formed in the four corners of the mold holding member 84, and these holes 94a to 94d have a total A cylindrical member 96 through which four guide rods 62 are slidably passed is installed inside. Further, guide blocks 98a to 98d, which are generally L-shaped, are fixed in the vicinity of the holes 94a to 94d using a plurality of bolts 100 screwed into the mold holding member 84. Guide recesses 102a to 102d extending in an L-shape are formed in portions of the guide blocks 98a to 98d on the mold holding member 84 side.

As shown in FIG.
Sliding parts 1 that slightly protrude to the sides and extend parallel to each other
04a and 104b are formed. In this case, the mold holding member 84 is provided with a hole 106 whose one end is open at the sliding contact portion 104a, and the hole 106 is opened at one end.
An internal thread 108 is formed on the other end of 6. A protruding member 110 having a hemispherical tip and a coil spring 112 are sequentially inserted into the hole 106, and a screw 114 is screwed into the internal thread 108, thereby causing the coil spring 112 to rebound. Under the action, the tip of the protrusion member 110 is made to protrude to the outside of the hole 106. The area between the guide blocks 98a and 98b in the mold holding member 84 is constructed in this manner, and the area between the guide blocks 98c and 98d is similarly configured. That is, the guide block 98
Also between the sliding contact portions 104a and 104b between c and 98d.
A sliding contact portion (not shown) similar to that is formed, and further,
A mold holding member 84 is placed under the spring force of the coil spring.
A protruding member is provided that protrudes from the inside to the outside.

In the above configuration, the sliding molds 20a to 20d are fitted into the spaces between the guide blocks 98a to 98d, respectively. So, next,
The sliding molds 20a to 20d will be explained.

The sliding mold 20a substantially includes a mold base 118a, a mold tip 120a, and core pins 122a, 124.
a is integrally incorporated. and,
Similarly, the other sliding molds 20b, 20c, 20d have mold bases 118b, 118c, 118d, mold tip 12.
0b, 120c, 120d and a core pin (not shown). In this case, the mold base 118a
Inclined holes 126a to 126d are formed in the holes 126a to 118d through which the inclined rods 48a, 48b and other inclined rods (not shown) can slide.
Furthermore, the mold bases 118a to 118d are provided with fixing parts 1.
Slope portions 128a to 128d are formed parallel to the second slope portions 52a and 52b and other slope portions (not shown). In the sliding mold 20c, as shown in FIG.
Fitting portions 130c and 131 that slidably engage b.
Drill c. In this case, the sliding molds 20a, 20
Similarly, in b and 20d, the guide recess 10
Fitting portions 130a, 1 that engage with 2a to 102d
30b, 130d and 131a, 131b, 1
Drill 31d. Furthermore, the mold base 118c, 1
Conical positioning recesses 132c and 132d are formed in the vertical surface portion 18d on the mold holding member 84 side.

The sliding molds 20a to 20d configured as described above are arranged so as to be in sliding contact with the mold holding member 84 and the guide blocks 98a to 98d.

Furthermore, a support member 134 and a stopper member 136 that is integrated with the support member 134 and projects toward the fixed portion 12 are fixed to the lower end of the mold holding member 84 using bolts 138a and 138b.
In addition, in the mold open state (see FIG. 2), the lower end of the sliding mold 20a is configured to abut against the stopper member 136.

On the other hand, support members 140a, 140b are fixed to the upper ends of the guide blocks 98b, 98c, and a plate 142 is installed over the upper ends of these support members 140a, 140b. A hole 144 is bored in the center of the plate 142, and a bolt 1 is inserted into the hole 144.
46. At that time, a washer 148 and a coil spring 150 are installed on the head side of the bolt 146.
and then the tip of the bolt 146 is screwed onto the mold base 118b of the sliding mold 20b.
Furthermore, in this case, a lock nut 152 is screwed onto the tip side of the bolt 146, and as shown in FIG. 2, when the mold opening is completed, the coil spring 15
The structure is such that the state of contact between the lock nut 152 and the plate body 142 is maintained by a resilient force of zero.

Next, the mixture body block of the carburetor body formed by the fixed mold 16, movable mold 18, and sliding molds 20a to 20d will be explained.

The carburetor main body 154 shown in FIG.
6,158,160 are integrated and configured. In this case, the throttle body block 156 is made of metal such as zinc or aluminum alloy,
The mixture body block 158 and the air horn block 160 are made of synthetic resin.

A main intake passage 162 and a secondary intake passage 164 are formed in parallel in the carburetor body 154. In this case, the main intake passage 162 and the secondary intake passage 164 are formed in parallel.
The middle part of each is a mixture body block 15.
Outer bench lily 166, 168 formed in 8
consists of Also, outer bench lily 166,1
Inner bench lily 170,1 near the upstream of 68
72 is arranged. Furthermore, a choke valve 174 is pivotally supported on the upstream side of the main intake passage 162 in the air horn block 160, and throttle valves 176, 1 are supported on the downstream side of the main intake passage 162 and the secondary intake passage 164 in the throttle body block 156.
78 is pivotally supported. That is, when the carburetor main body 154 is used, the outer bench lily 166,1
68 and the inner bench lilies 170, 172, fuel is mixed with air and introduced into a cylinder (not shown).

Incidentally, in addition to the outer bench lilies 166 and 168, various holes and recesses shown as oval shapes in FIG. 6 must be formed in the mixture body block 158. That is, substantially, the fixed mold 16, the movable mold 18, and the sliding mold 2
0a to 20d and these types 16, 18, 2
A mixture body block 158 is formed by core pins provided at 0a to 20d.

For example, a float chamber 180 (see FIGS. 6 and 7) is formed in the mixture body block 158. An air bleed tube insertion hole 182 extending vertically is formed in the side wall defining the float chamber 180, and the air bleed tube insertion hole 182 extends from the bottom side of the float chamber 18 at the end of the air bleed tube insertion hole 182. A fuel jet mounting hole 184 communicating with the fuel jet is formed. In addition, the float chamber 180
Holes 186 and 188 communicating from the outside into the float chamber 180 are formed in the side wall portion defining the float chamber 180 at portions facing the holes 182 and 184. Note that the holes 186 and 188 are later closed with a predetermined member.

The mold and core pin for molding the portion of the mixture body block 158 shown in FIG. 7 will now be described.

FIG. 8 shows a substantially central portion of the molding device 10 shown in FIG. 1, and the mixture body block 158 shown in FIG. 7 is molded in the molding device 10 with the direction of arrow A facing upward. . In this case, in order to mold the outer bench lily 168, the fixed mold 16 is provided with a protrusion 190, and this protrusion 19
A protrusion 192 that abuts on the movable mold 18 is provided on the movable mold 18 (see FIGS. 7 and 8). In addition, float chamber 1
A core pin 122 is disposed within the protrusion 194 of the sliding mold 20a that will form the hole 188 communicating with the
The tip of the core pin 122a corresponds to the fuel jet attachment hole 184, and the tip of the core pin 124a corresponds to the hole 186 communicating with the float chamber 180. Furthermore, a float chamber protrusion 19 for forming the float chamber 180
6 is protruded from the movable mold 18, and a through hole 198 is bored at the tip of the float chamber protrusion 196 through which the core pin 122a is slidably inserted. The core pin 90 provided on the movable mold 18 is for molding the air bleed tube insertion hole 182, and the core pins 90, 1 are provided in the mold clamping state.
The tips of each of the 22a are configured so as to be in close contact with each other.

Although a description of the core pin for forming other holes in the mixture body block 158 will be omitted, a fixed mold is used to define an appropriate cavity 42 in order to obtain the mixture body block 158 in a predetermined shape. 16, the movable mold 18, the sliding molds 20a to 20d, and all core pins are configured. Also, Mixture Body Block 1
58, a large number of holes are formed on the upper side in FIGS. 6 and 7, and a relatively small number of holes are formed on the lower side. That is, the number of core pins provided in the mixture body block 158 on the side of the throttle body block 156 (see FIG. 5) is relatively small, and the flow of molten resin to the side where there are fewer core pins is relatively small. A gate section 40 is provided for the purpose.

The molding apparatus for carrying out the method of the present invention is basically constructed as described above, and its operation and effects will be explained next.

First, when clamping the mold from the mold open state shown in FIG. 2, the movable part 14 is displaced toward the fixed part 12 by driving a cylinder mechanism (not shown) connected to the movable platen 64. As a result, inclined rods 48a and 48b, which are provided to extend in four directions from the engaging body 44 toward the movable part 14, and two other inclined rods (not shown) are formed on the sliding molds 20a to 20d. The inclined hole portions 126a to 12
6d. At this time, the guide rods 62 (see FIG. 4) are inserted into the cylindrical members 96 disposed at the four corners of the mold holding member 84, so the movable part 14 is guided by the guide rods 62 and displaced. . As mentioned above, the four inclined rods (48a, 48b, etc.) are connected to the inclined holes 126a to 126a.
The sliding molds 20a to 20d are inserted into the four inclined rods (48a, 48d).
b etc.) and is displaced toward the movable mold 18 side. In this case, the sliding molds 20a to 20d slide while being guided by the mold holding member 84 and guide blocks 98a to 98d. That is, the sliding molds 20a to 20d have fitting portions 130a to 130d and 131a to 131 protruding therefrom.
d is displaced in the mold clamping direction while being engaged with guide recesses 102a to 102d formed in guide blocks 98a to 98d. Furthermore, the four inclined rods (48a, 48b, etc.) and the inclined hole 1
26a to 126d for sliding operation.
When the parts a to 20d approach the movable mold 18 side, the engaging members 54a and 54b provided on the engaging body 44 and the other parts shown in the figure The two engaging members that do not move slide. That is, the sliding molds 20a to 20d initially had four inclined rods (4
8a, 48b, etc.), and in the latter half of the mold clamping process, the sliding movement with the four engaging members (54a, 54b, etc.) causes displacement in the mold clamping direction. is strongly pressed. In this case, the bolt 146 screwed onto the sliding mold 20b
is displaced downward, so that the coil spring 150 is compressed between the washer 148 and the plate 142.
Furthermore, since the sliding dies 20a to 20d are engaged with the recesses 102a to 102d formed in the guide blocks 98a to 98d as described above, the sliding dies 20a to 20d are connected to the fixed part 10 when the molds are clamped. High precision mold clamping is performed without any floating to the side. Finally, the fixed mold 16, the movable mold 18, and the sliding molds 20a to 20
d come into pressure contact with each other to define a cavity 42. At that time, since the respective tips of the protruding member 110 and other protruding members (not shown) enter the positioning recesses 132c, 132d in which the sliding dies 20c, 20d are formed, the sliding dies 20c, 20d are even more accurately positioned.

Further, during mold clamping, a core pin 122a that is displaced integrally with the sliding mold 20a is inserted into a through hole 198 formed in the movable mold 18, and the core pin 122a is inserted into a through hole 198 formed in the movable mold 18.
The tip of the core pin 90 contacts the tip of the core pin 90 . Furthermore, the core pin 124a abuts on the float chamber protrusion 196 of the movable die 18, and the protrusion 190 of the fixed die 16 and the protrusion 192 of the movable die 18 abut as shown.

After the mold is clamped as described above, the resin is melted through the nozzle member 32 and transferred to the cavity 42.
Supplied at a predetermined pressure. In this case, the resin is a polycarbonate resin that can obtain extremely high strength and rigidity by mixing glass fiber, etc., and also has excellent heat resistance, dimensional stability, and excellent processability as a thermoplastic resin. It is preferable to use heat-resistant engineering plastics such as enylene sulfide (PPS).

The molten resin supplied into the nozzle member 32 flows into the cavity 42 via the nozzle part 40.
In this case, since the nozzle portion 40 is provided on the side where the number of core pins is relatively small and the structure of the cavity 42 is relatively simple, the molten resin smoothly spreads inside the cavity 42 and the core pins are not bent. In addition, problems such as burn-in will not occur. Thereafter, the molten resin solidifies as the temperature decreases, forming a molded product corresponding to the shape of the cavity 42, that is, a mixture body block 158.
is formed.

Next, when opening the mold, the movable part 14 is moved away from the fixed part 12 to the initial mold opening position. That is, in Figure 1,
The movable part 14 is displaced to the right in the figure. As a result, the movable mold 18 is separated from the fixed mold 16, and the sliding molds 20a to 20d are separated from each other due to the sliding movement between the four inclined rods (48a, 48b, etc.) and the inclined holes 126a to 126d. It is displaced in the direction of mold opening. At that time, core pin 122
a is removed from the through hole 198 of the movable mold 18, and the sliding mold 20a finally descends until it comes into contact with the stopper member 136 as shown in FIG. on the other hand,
The sliding mold 20b rises due to the sliding action with the inclined rod 48b and the hair-cutting elastic force of the coil spring 150, and rises to a position where the lock nut 152 abuts against the plate 142.

After the mold is opened in this manner, the mixture body block 158 molded within the cavity 42 and in close contact with the movable mold 18 is moved to the extrusion mechanism 70.
(See Figure 1). That is,
The extrusion plate 74a is inserted into the hole 68 of the movable platen 64.
By sending out a cylinder rod (not shown) fixed to the fixed part 12 side, the extrusion plates 74a, 74
b along the guide rod 76. As a result, the extrusion pin (not shown), which is fixed to the extrusion plate 74b and whose tip reaches the cavity 42, extrudes the mixture body block 158 toward the fixed part 12 side. In the manner described above, a mixture body block 158 made of synthetic resin is obtained.

According to the present invention, as described above, since the miscutter body block constituting the carburetor body is made of lightweight synthetic resin with excellent corrosion resistance, it is possible to reduce the weight of the carburetor body. Moreover, since the various recesses and holes required for the miscut chamber body block are formed by a combination of fixed molds, movable molds, sliding molds, and core pins of predetermined shapes, the various recesses and holes required after injection molding are The effect is that the number of processing operations is reduced and production efficiency is improved. Further, a gate portion communicating with the inside of the cavity for forming the mixture body block is provided on the side of the cavity where the structure is relatively simple, that is, in the embodiment, on the side of the throttle body block 156 of the mixture body block 158. Therefore, the molten resin can easily flow to every corner of the cavity, and a suitable injection process can be performed. Furthermore, by using polyphenylene sulfide, which has excellent properties as a thermoplastic resin, as the resin material constituting the miscut chamber body block, the occurrence of burrs can be minimized. Therefore, it is possible to prevent the mold from collapsing, which was caused by the conventional use of an extremely hard thermosetting resin, and it is possible to extend the life of the mold. Furthermore, since the sliding mold in the molding device is properly guided and displaced by the guide block, it is possible to achieve highly accurate mold clamping without positional deviation, and it is possible to easily form a mixture body block in a desired shape. The effect is that it can be molded.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to these embodiments. Of course, various improvements and changes in design are possible without departing from the gist of the present invention, such as being able to be molded by.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing the molding apparatus according to the present invention in a mold-clamped state, FIG. 2 is a partially omitted vertical cross-sectional view showing the molding apparatus in FIG. 1 in a mold-opened state, and FIG. FIG. 4 is a partially omitted vertical cross-sectional view showing the vicinity of the end of the molding device according to the present invention, and FIG. 5 is a vertical cross-sectional view of the carburetor main body. , FIG. 6 is a perspective view of a mixture body block constituting the carburetor body, FIG. 7 is a longitudinal sectional view of the mixture body block, and FIG. 8 is a longitudinal sectional view showing approximately the center of the molding device of FIG. 1. It is. 10... Molding device, 12... Fixed part, 14...
Movable part, 16... Fixed type, 18... Movable type, 20
a-20d...Sliding type, 32...Nozzle member, 4
0...Gate part, 42...Cavity, 48a,
48b... Inclined rod, 84... Mold holding member, 9
0...Core pin, 98a-98d...Guide block, 122a, 124a...Core pin, 154
...Carburetor body, 158...Mixture body block.

Claims (1)

[Scope of Claims] 1. A fixed mold, a movable mold that faces the fixed mold and can move forward and backward with respect to the fixed mold, and a movable mold that is fixed to the fixed mold and is oriented in a direction different from the displacement direction of the movable mold. a tilted rod that moves forward and backward along the tilted rod from a direction different from the direction of displacement of the movable mold in a space defined by the fixed mold and the movable mold to move the cavity together with the fixed mold and the movable mold. A molding device for molding a carburetor block made of synthetic resin by at least one or more sliding molds defining a mold, the molding device having a recessed portion, the sliding mold and the recessed portion being engaged in a sliding state. a guide block that guides the sliding mold through the recess to displace it in the mold opening/closing direction, and positions the sliding mold by the recess during mold clamping; and the fixed mold, the movable mold, and the sliding mold. A core pin for forming the hole, which is provided in at least one of the molds, defines a hole in a carburetor block that is a molded product, and is provided in contact with the core pins or with another contact portion. , wherein a gate portion communicating with the cavity and introducing molten oil into the cavity is provided on a side of a throttle body block constituting a mixture body block of the carburetor, and the formation pin 122a of the carburetor block is movable. The sliding mold 20a is removed from the through hole 198 of the mold 18.
Finally, as shown in Fig. 2, the stopper member 1
36. On the other hand, the sliding mold 20b rises due to the sliding movement with the inclined rod 48b and the elastic force of the coil spring 150, and rises to a position where the lock nut 152 abuts against the plate 142. shape device.