JP7305280B2 - Resin valve body and manufacturing method thereof - Google Patents

Description

TECHNICAL FIELD The present invention relates to a resin valve body and a manufacturing method thereof.

Patent Literature 1 discloses a technique of rotating a casting pin in order to improve the accuracy of forming a punched hole in a cast product.

JP-A-9-192815

However, the technique of Patent Document 1 does not take into account the cooling rate and thickness of the cast product, and there is a risk that the accuracy of forming the injection hole will not be improved.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a resin valve body and a method of manufacturing the resin valve body in which the accuracy of forming the injection hole of the cast product is improved.

In the resin valve body and the manufacturing method thereof of the present invention, the valve bore in which the valve spool slides is formed in the gap between the cylindrical hole formed in the metal frame embedded in the valve body and the cast pin concentric with the cylindrical hole. It was formed with filled resin.

Therefore, it is possible to improve the molding accuracy of the injection hole of the valve bore in which the valve spool of the resin valve body slides.

It is a figure showing the whole resin valve body to which the present invention is applied. 4 is a diagram showing a metal frame that forms the outer peripheral surface of the valve bore of Embodiment 1. FIG. 4 is a view showing a die-casting machine for manufacturing the lower body of the resin-made valve body of Embodiment 1. FIG. 4 is an exploded perspective view showing a die of a die casting machine for manufacturing a lower body of the resin valve body of Embodiment 1. FIG. FIG. 2 is a diagram showing the slide mold of Embodiment 1; 1 is a time chart 1 showing an operation example of a resin die casting method for manufacturing a lower body of a resin valve body according to Embodiment 1; 4 is a time chart 2 showing an operation example of the resin die casting method for manufacturing the lower body of the resin valve body of the first embodiment;

BEST MODE FOR CARRYING OUT THE INVENTION A resin valve body and a method for manufacturing the same according to the present invention will be described below based on Embodiment 1 shown in the drawings.
[Embodiment 1]

The method of manufacturing a resin valve body according to the first embodiment is applied to manufacturing a valve body of a control valve attached to an automatic transmission.
Hereinafter, the configuration of Embodiment 1 will be described by dividing it into "valve body configuration", "die casting machine configuration", and "operation of resin die casting method".

[Resin valve body configuration]
FIG. 1 is a diagram showing the entire resin valve body to which the present invention is applied.
Based on FIG. 1, the configuration of the resin valve body will be described.

The valve body 1 is made of a resin material A (valve body material, see FIG. 3, etc.) and manufactured by a resin die casting method.
The resin material A is, for example, PES (polyethersulfone).
A valve body 1 made of resin has an upper body 11 and a lower body 12 .
An oil passage 15 forming a hydraulic circuit is formed in each of the upper body 11 and the lower body 12 . The hydraulic circuit is a circuit for automatic transmission hydraulic fluid (ATF).
The lower body 12 has valve bores 13 . A valve spool 14 is slidably inserted into the valve bore 13 . An orifice plate (not shown) is provided between the upper body 11 and the lower body 12 .

2 is a view showing a metal frame forming the outer peripheral surface of the valve bore of Embodiment 1. FIG.
The metal frame configuration will be explained based on FIG.

The metal frame 100 is embedded in the lower valve body 12 of the resin valve body 1 and forms the outer peripheral surface of the valve bore 13 in which the valve spool 14 slides.
The metal frame 100 is made of iron, for example, and is configured by abutting a first metal plate (one metal plate) 101 and a second metal plate (the other metal plate) 102 formed by press molding.
The first metal plate 101 has three first half-cylindrical portions 101a, and the second metal plate 102 has three second half-cylindrical portions 102a. , butt against each other to form three cylindrical holes 100a.

[Die casting machine configuration]
FIG. 3 is a view showing a die casting machine for manufacturing the resin valve body lower body of the first embodiment, and FIG. 4 is a die of the die casting machine for manufacturing the resin valve body lower body of the first embodiment. 5 is an exploded perspective view showing the slide mold of Embodiment 1. FIG.
The configuration of the die casting machine will be described based on FIGS. 3 to 5. FIG.
It is assumed that the die casting machine 2 molds the lower body 12 of the valve body 1 made of resin.

The die casting machine 2 is used for a resin die casting method.
A die casting machine 2 has a die 3 .

The mold 3 is a space surrounded by a movable-side cavity 71 and a fixed-side cavity 51 of the mold 3. A molten resin material A is injected into the cavity space S in which the metal frame 100 is arranged, and the lower body 12 is formed. to mold.
The mold 3 has a fixed mold 5 fixed to a fixed frame 4 , a movable mold 7 fixed to a movable frame 6 , and a slide mold 8 .
The mold 3 is appropriately provided with gas vent holes (not shown) for venting gas.

The fixed frame 4 has a casting port 41 , and the fixed mold 5 has a fixed side cavity 51 and a sprue 52 .
, and a fixed opening 53 .
The fixed-side cavity 51 is a carved surface (space) corresponding to the lower body 12 portion of the fixed die 5 . The sprue 52 connects the casting port 41 and the fixed side cavity 51 . A part of the slide mold 8 is fitted in the fixed mold opening 53 .

The movable frame 6 is provided so as to be able to reciprocate in the vertical direction X with respect to the mating surface of the fixed mold 5 . Therefore, the movable mold 7 operates together with the movable frame 6 .
Here, the “vertical direction X” refers to a mold clamping direction X1 in which the movable frame 6 moves toward the fixed mold 5 to close the mold 3, and a mold opening direction in which the movable frame 6 moves away from the fixed mold 5 to open the mold 3. and X2.
The movement of the movable frame 6 is performed by a hydraulic cylinder (not shown), and the hydraulic cylinder is controlled by a movable frame controller.
The movable mold 7 has a movable side cavity 71 and a movable mold opening 73 . The movable side cavity 71 is a carving surface (space) corresponding to the lower body 12 portion of the movable mold 7 . The remaining part of the slide mold 8 is fitted in the movable mold opening 73 .

The slide mold 8 is provided slidably in an orthogonal direction Y (vertical direction) perpendicular to the vertical direction X (mold clamping direction X1).
Here, the "perpendicular direction Y" is the downward direction Y1 in which the slide mold 8 moves downward and the upward direction Y2 in which the slide mold 8 moves upward.
The movement of the slide mold 8 is performed by a hydraulic cylinder (not shown), and the hydraulic cylinder is controlled by a slide controller.

The slide die 8 has a slide die main body 81 , three slide pins (cast pins) 82 with drill grooves, and a motor 83 .
The slide mold body 81 is fitted in the mold opening 33 composed of the fixed mold opening 53 and the movable mold opening 73 .
The drilled grooved slide pin 82 is arranged in a cavity space S which is a space surrounded by the fixed side cavity 51 and the movable side cavity 71 .
Further, the slide pin 82 with drill grooves is arranged in a cavity space S which is a space surrounded by the fixed side cavity 51 and the movable side cavity 71. It is placed in a cylindrical hole 100a formed by butting together.

Three motors 83 are provided on the top of the slide type body 81, and three slide pins 82 with drill grooves are provided on the bottom of the slide type body 81 corresponding to the three motors 83. .
The three drilled grooved slide pins 82 each have a drilled groove 82a. The edge cutting edge formed by the drill groove 82 a drills the valve bore 13 . The drill groove 82a discharges shavings from the edge cutting edge.
Here, the edge blade is for forming the inner peripheral surface of the valve bore 13, and the blade is set with post-machining precision for the inner peripheral surface of the valve bore 13. As shown in FIG. The precision required for post-processing is micron-level precision.
The three motors 83 each have a motor shaft 83a. The motor 83 is connected to the drilled slide pin 82 inside the slide body 81 via a motor shaft 83a. Therefore, the slide pin 82 with drill grooves is rotated by driving the motor 83 . The driving of the motor 83 is controlled by a motor controller (not shown).

[Operation of Resin Die Casting Method]
FIG. 6 is a time chart 1 showing an operation example of the resin die casting method for manufacturing the resin valve body lower body according to the first embodiment, and FIG. 2 is a time chart 2 showing an operation example of a resin die casting method;
An overview of the resin die casting method will be described with reference to FIGS. 6 and 7. FIG.
6 and 7, illustration of the fixed frame 4 and the movable frame 6 is omitted.

The resin die casting method is a method for manufacturing the lower body 12 by die casting, and includes a metal frame installation step (time T1), a mold clamping step and slide mold placement step (time T2), a material filling step (time T3), and a cooling and solidification step. (time T3 to time T4), a hole drilling process (time T4), a mold opening pre-process (time T5), and a mold opening process (molded product removal process, time T6). They will be explained in order below.

In the metal frame installation step (time T1), as shown in FIG. 6, the movable mold 7 is moved in the mold opening direction X2, and in the mold open state, the metal frame 100 is surrounded by the movable mold cavity 71 and the fixed mold cavity 51. It is a step of installing in the cavity space S, which is a hollow space.
In the mold clamping step (time T2), the movable mold 7 is moved in the mold clamping direction X1 and clamped to the fixed mold 5 .
In the slide mold arrangement step (time T2), as shown in FIG. 6, the slide mold 8 is moved through the mold opening 33 formed by the movable mold opening 73 and the fixed mold opening 53 in a clamped state. A part of the slide mold main body 81 is fitted into the mold opening 33, and a part of the slide pin 82 with drill groove is in the cavity space S which is the space surrounded by the fixed side cavity 51 and the movable side cavity 71. Further, a part of the slide pin 82 with drill grooves arranged in the cavity space S is arranged so that the first metal plate 101 and the second metal plate 102 of the metal frame 100 arranged in the cavity space S are mutually This is a step of arranging in the formed cylindrical hole 100a by abutting. At this time, the upper part of the slide mold main body 81 is arranged above the mold opening 33 .

In the material filling step (time T3), first, the slide die 8 is further moved in the downward direction Y1, and the entire slide die main body 81 is fitted into the die opening 33, and the inside of the cavity space S where the valve bore 13 is to be formed. The first metal plate 101 and the second metal plate 102 of the metal frame 100 placed in the center of the metal frame 100 are mated with each other, so that the entire drilled slide pin 82 is reliably inserted in a concentric state into the cylindrical hole 100a formed. state.
At this time, the upper surfaces of the fixed mold 5, the movable mold 7, and the slide mold main body 81 are flush with each other.
In other words, a molded product-shaped cavity space S is created before the valve bore 13 is drilled. Here, the cavity space S is arranged in the space surrounded by the fixed-side cavity 51 and the movable-side cavity 71, and in the space surrounded by the fixed-side cavity 51 and the movable-side cavity 71, which is the position of the valve bore 13. A cylindrical hole 100a formed by mating the first metal plate 101 and the second metal plate 102 of the metal frame 100 together is a space in which the entire slide pin 82 with a drill groove is securely inserted.

After that, the melted resin material A is filled into the cavity space S through the casting port 41 and the sprue 52 . Specifically, the melted resin material A is poured into the casting port 41 . The resin material A of the casting port 41 is pushed into the sprue 52 by a casting piston (not shown). In this step, the cavity space S is filled with the resin material A (pressed-in resin material) pressurized from the sprue 52 .
In the cooling and solidifying process (time T3 to time T4), the resin material A in the cavity space S is solidified by cooling after the resin material A is filled into the cavity space S in the material filling process.
Here, the solidification temperature judged to be "solidification" is the temperature at which the material loses its fluidity and is the temperature at which the material is not deformed (thermally deformed) by heat. In other words, the solidification temperature is the temperature at which the material strength of the material itself is obtained. The solidification temperature is set according to the relationship between the linear expansion coefficient of the material and the mold temperature.

In the hole drilling step (time T4), as shown in FIG. 7, after the resin material A is cooled and solidified in the cooling and solidifying step, the mold clamped state, that is, the state in which the resin material A is fixed by the fixed mold 5 and the movable mold 7. , the slide pin 82 with the drill groove is rotated by the motor 83 .
That is, the hole processing of the valve bore 13 is performed by the edge blade while the mold is clamped. At this time, shavings of the edge cutting edge are discharged through the drill groove 82a. Further, the drilled grooved slide pin 82 is pulled out from the resin material A as the slide type main body 81 moves in the upward direction Y2 while being rotated by the motor 83 . That is, it is a step in which hole processing by the slide pin 82 with a drill groove and drawing out of the slide pin 82 with a drill groove are performed at the same time.
Here, the resistance applied to the resin material A is smaller than that of the metal material when it is cut by the edge blade formed by the drill groove 82a.
Therefore, even if the temperature of the resin material A is cooled to a temperature at which the material strength of the material itself is obtained, and the cooled and solidified resin material A is buried in the drill groove 82a, drilling by the edge blade is possible.
In the pre-opening step (time T5), the hole is drilled in the hole drilling step and the slide pin 82 with the drill groove is pulled out.
That is, the slide mold 8 is removed from the molded product (lower body 12) in which the valve bore 13 has been processed, and the molded product (lower body 12) in which the metal frame 100 is embedded in the cavity space S is present.
In the mold opening process (molded article removing process, time T6), the movable mold 7 is moved in the mold opening direction X2 after the mold opening pre-process, and the mold is opened from the fixed mold 5 . After the mold 3 is opened, the molded lower body 12 is taken out. Then, the process returns to the metal frame installation step, and a new lower body 12 is manufactured.

In this manner, the metal frame 100 is placed in the cavity space S in the mold open state in the metal frame installation step, and the metal frame 100 is placed in the cavity space S at the position where the valve bore 13 is to be formed in the material filling step. The resin material A is inserted into the cavity S with the drilled slide pin 82 securely inserted into the cylindrical hole 100a formed by joining the first metal plate 101 and the second metal plate 102 together. is filled, the outer peripheral surface of the valve bore 13 is formed by the inner peripheral surface of the cylindrical hole 100a of the metal frame 100, and the outer periphery of the drilled slide pin 82 concentric with the cylindrical hole 100a is formed in the material filling process to the cooling and solidifying process. The surface forms the inner peripheral surface of the valve bore 13 .
That is, the outer peripheral surface of the valve bore 13 has an accurate outer diameter due to the inner peripheral surface of the cylindrical hole 100a of the metal frame 100, and the inner peripheral surface of the valve bore 13 has a slide pin 82 with a drill groove inserted concentrically with the cylindrical hole 100a. As a result, the valve bore 13 can be formed to have an accurate inner diameter and a uniform thickness that can ensure the circularity of the valve bore diameter.

Further, the inner peripheral surface of the valve bore 13 having a uniform thickness is formed with an edge cutting edge by rotating a drilled grooved slide pin 82 which is concentric with the cylindrical hole 100a.
Further, even after the resin material A has cooled and solidified, the slide pin 82 with the drill groove can be pulled out, so deformation of the shape of the valve bore 13 due to heat is suppressed.
Thereby, the circularity of the valve bore 13 can be further improved.
Therefore, after the lower body 12 is taken out from the mold 3, the post-processing of the valve bore 13, which is different from the resin die casting method, is not necessary, and the processing cost can be saved.

As a result, it is possible to improve the roundness of the valve bore 13 when the slide pin 82 with a drill groove is pulled out and to reduce the processing cost of post-processing (finishing). A valve body (lower body 12) can be manufactured.
Here, the "processing cost" is the man-hour and cost of processing. The costs are personnel costs when processing is performed by humans, and equipment costs such as machine tools when processing is performed by machines. The cost also includes the cost of material cut by post-processing.

Further, in the drilling step, drilling of the valve bore 13 is performed by pulling out the drilled slide pin 82 while rotating it. That is, in the drilling process, drilling by the slide pin 82 with the drill groove and pulling out the slide pin 82 with the drill groove are performed simultaneously.
Therefore, the time required to take out the molded lower body 12 from the mold 3 can be shortened, and since the slide pin 82 with the drill groove is used for drilling the hole, there is no need for a conventional draft for removing the slide pin. Therefore, the material cost for the draft angle can be saved.

The circularity of the valve bore 13, that is, the processing accuracy, is required to be in the order of microns. Therefore, when post-processing is performed after the casting hole forming process as in the conventional method, it takes time for positioning and the like in order to meet the processing accuracy. If the positioning is wrong, the molded product itself will be discarded, and the cost (man-hour and cost) for the cast hole forming process will be wasted.
On the other hand, the inner peripheral surface of the valve bore 13 having a uniform thickness is cut by a slide pin 82 with a drill groove in a state where the resin material A is fixed by the fixed die 5 and the movable die 7 in the drilling process of the resin die casting method. The valve bore 13 is drilled.
In other words, the fixed mold 5 and the movable mold 7 serve as jigs. On the other hand, if hole processing is performed after the mold is opened, it is necessary to fix the lower body 12, which is a molded product, using jigs. Further, when fixing, the positional relationship between the lower body 12, which is a molded product, and the jig may shift.
Therefore, it is possible to improve the accuracy of drilling by the slide pin 82 with the drill groove by performing the hole drilling process in the clamped state rather than performing the drilling process in the mold open state.
Therefore, the roundness of the valve bore 13 can be improved more by performing the drilling process in the closed state than in the opened state.
This eliminates the time required for positioning, etc., and the edge cutting edge can respond to machining accuracy requirements, so the valve bore diameter can be managed with high accuracy.

Furthermore, in Embodiment 1, the valve body material is the resin material A. Then, in the cooling and solidification step, the resin material A is solidified by cooling to a temperature at which the fluidity of the resin material A is lost. That is, since the resin material A is cooled and solidified until it loses its fluidity, even if the slide pin 82 with the drill groove is rotated and pulled out, deformation due to heat is further suppressed.
Therefore, when the resin material A is used, the roundness of the valve bore 13 can be further improved.

As described above, the resin valve body and the manufacturing method thereof according to the first embodiment have the following effects.

(1) The inner peripheral surface of the cylindrical hole 100a of the metal frame 100 forms the outer peripheral surface of the valve bore 13, and the outer peripheral surface of the drilled slide pin 82 concentric with the cylindrical hole 100a of the metal frame 100 forms the valve bore. 13 outer peripheral surfaces are formed.
Therefore, it is possible to form the valve bore 13 having a uniform thickness that ensures the circularity of the valve bore diameter.

(2) After the inner peripheral surface of the valve bore 13 with a uniform thickness is formed with an edge blade by rotating the slide pin 82 with a drill groove concentric with the cylindrical hole 100a, and the resin material A is cooled and solidified. The slide pin 82 with a drill groove can be pulled out even if it is.
Therefore, deformation of the shape of the valve bore 13 due to heat is suppressed, and the roundness of the valve bore 13 can be improved. Post-processing becomes unnecessary, processing costs can be saved, and a lightweight resin valve body (lower body 12) with high dimensional accuracy can be manufactured.

(3) In the drilling process, the drilling by the slide pin 82 with the drill groove and the extraction of the slide pin 82 with the drill groove are performed simultaneously.
Therefore, it is possible to reduce the time required to take out the molded lower body 12 from the mold 3, and since the slide pin 82 with the drill groove is used for drilling, the conventional draft for removing the slide pin is not required. Therefore, the material cost for the draft angle can be saved.

(4) The valve bore 13 is drilled by the slide pin 82 with the drill groove while the resin material A is fixed by the fixed die 5 and the movable die 7 .
Therefore, no time is required for positioning, etc., and since the edge blade can meet the processing accuracy, the diameter of the valve bore can be controlled with high accuracy, so that the roundness of the valve bore 13 can be further improved.

(5) The metal frame 100 is composed of two first metal plates 101 and a second metal plate 102 formed by press molding. A cylindrical hole 100a is formed by abutting the second half cylindrical portion 102a formed in 102 against each other.
Therefore, the cylindrical hole 100a can be formed inexpensively by a simple method.

(6) In the method of manufacturing a resin valve body (lower body 12) having a valve bore 13 into which a valve spool 14 is inserted so as to be able to stroke, the metal frame installation step (time T1), the mold clamping step and the slide mold placement step ( Time T2), material filling process (time T3), cooling solidification process (time T3 to T4), hole drilling process (time T4), mold opening pre-process (time T5), mold opening process (molded product a take-out step, time T6).
The metal frame installation step (time T1) is a step of placing the metal frame 100 in the space surrounded by the movable mold cavity 71 and the fixed mold cavity 51 while the mold 3 is in the open state.
The mold clamping step (time T2) is a step of closing the mold 3, and the slide mold placement step (time T2) is the slide mold 8 placed inside the cylindrical hole 100a of the metal frame 100 that will become the valve bore 13 after mold clamping. This is a step of inserting a part of the slide pin 82 with a drill groove.
In the material filling step (time T3), the drilled grooved slide pin 82 of the slide die 8 is further moved in the downward direction Y1, and the entire slide die main body 81 is fitted into the die opening 33 to form the valve bore 13. After the drilled grooved slide pin 82 as a whole is securely inserted concentrically into the cylindrical hole 100a, the valve body material (the resin material A of the lower body 12) melted in the cavity space S. It is a step of filling the
The cooling and solidification step (time T3 to time T4) is a step of solidifying the valve body material (resin material A) filled in the cavity space S by cooling.
The drilling step (time T4) is a step of cooling and solidifying the valve body material (resin material A), and drilling the valve bore 13 while rotating and pulling out the slide pin 82 with the drill groove.
The mold opening pre-process (time T5) is a process in which the slide mold 8 is removed from the molded product (lower body 12) in which the valve bore 13 has been processed. is a state in which there is
In the mold opening process (molded article removing process, time T6), the movable mold 7 is moved in the mold opening direction X2 after the mold opening pre-process, and the mold is opened from the fixed mold 5 . After the mold 3 is opened, the lower body 12, which is a molded product, is taken out.

Therefore, in the cooling and solidification step (time T3 to time T4), the valve bore 13 is cooled and solidified while its shape is held by the inner peripheral surface of the cylindrical hole 100a of the metal frame 100 and the outer peripheral surface of the drilled slide pin 82. , the thickness can be uniform enough to ensure the circularity of the valve bore diameter.

Further, in the drilling step (time T4), after the cooling and solidification step, the slide pin 82 with the drill groove is rotated and removed from the valve bore 13 having a uniform thickness, thereby suppressing deformation of the shape of the valve bore 13 due to heat. It is possible to produce a lightweight resin valve body (lower body 12) with high dimensional accuracy that achieves both an improvement in circularity of 13 and a reduction in processing cost in post-processing.

Furthermore, in the drilling process (time T4), drilling by the slide pin 82 with the drill groove and pulling out the slide pin 82 with the drill groove are performed simultaneously, so that the lower body 12 as the molded product is removed from the mold 3. You can shorten the time to take out.

In the drilling step (time T4), the valve bore 13 is drilled by the slide pin 82 with the drill groove while the resin material A is fixed by the fixed mold 5 and the movable mold 7. , and the edge blade can meet the machining accuracy, so the diameter of the valve bore can be controlled with high accuracy, and the roundness of the valve bore 13 can be further improved.

In the cooling and solidification step (time T3 to time T4), resin material A is solidified by cooling to a temperature at which it loses fluidity, so when resin material A is used, the roundness of valve bore 13 can be further improved.

The resin valve body and the method of manufacturing the same according to the present invention have been described above based on the first embodiment, but the specific configuration is not limited to this embodiment. Design changes, additions, etc. are permitted as long as they do not deviate from the gist of the invention.

Embodiment 1 shows an example of manufacturing the lower body 12 having the valve bore 13 in which the valve spool 14 is inserted so as to be able to stroke. However, it is not limited to this. In short, it is sufficient to manufacture a valve body having a valve bore into which a valve spool can be stroked.
Further, the metal frame 100 is made of iron, and has been described as being configured by abutting the first metal plate 101 and the second metal plate 102 formed by press forming, but it is possible to use a material such as aluminum by casting. may be formed.

In the first embodiment, in the material filling step, before material filling, the slide mold 8 is moved in the downward direction Y1 to fit the entire slide mold main body 81 into the mold opening 33 .
However, it is not limited to this. For example, the slide mold may be moved downward and the entire slide mold main body 81 may be fitted into the mold opening 33 in the slide mold arrangement process or the mold clamping process.
In short, it suffices to move the slide mold 8 downward and fit the slide mold body 81 into the mold opening 33 before filling the material.

In the first embodiment, an example of drilling the valve bore 13 is performed by pulling out the slide pin 82 with the drill groove while rotating it.
However, it is not limited to this. For example, in the drilling process, after the drilling process of rotating the slide pin 82 with the drill groove is completed, the slide pin 82 with the drill groove may be pulled out (slide pin pull-out process).
Also, the drilled grooved slide pin 82 may be formed in a cylindrical shape without a drilled groove and pulled out without being rotated.

In the first embodiment, the mold opening step is performed in which the mold 3 is opened and the lower body 12, which is a molded product, is taken out after the hole drilling step is completed with the mold 3 closed.
However, it is not limited to this. For example, the fixed die 5 and the movable die 7 of the mold 3 may be opened before the hole drilling process, and then the hole drilling process may be performed using a jig or the like with the molds opened.

In Embodiment 1, an example in which the resin valve body and the manufacturing method thereof according to the present invention is a (resin) die casting method and a die casting machine 2 is shown. However, it is not limited to this. For example, the resin valve body and the method for manufacturing the same of the present invention may be used as a method and apparatus for casting pressure by gravity.
In short, the resin valve body and the method for manufacturing the same according to the present invention may be manufactured by casting.

Embodiment 1 shows an example in which the resin valve body and the method for manufacturing the same of the present invention are applied to the manufacture of the valve body of the control valve attached to the automatic transmission. In the first embodiment, the hydraulic circuit of the valve body 1 is a transmission hydraulic fluid (ATF) circuit.
However, it is not limited to this. In short, the resin valve body and the manufacturing method thereof according to the present invention may be applied to a valve body having a valve bore into which a valve spool is inserted so as to be able to stroke.

1 valve body 11 upper body (valve body)
12 Lower body (valve body)
13 valve bore 14 valve spool 82 slide pin with drill groove (cast pin)
100 metal frame 101 first metal plate (one metal plate)
101a first semi-cylindrical portion 102 second metal plate (other metal plate)
102a second half-cylinder portion

Claims (3)

In a resin valve body in which a valve bore in which a valve spool slides is formed by a cast pin,
The valve bore is formed of a resin material filled in a gap between a cylindrical hole formed in a metal frame embedded in the valve body and a cast-out pin concentric with the cylindrical hole,
A resin valve body characterized by: In the resin valve body according to claim 1,
The metal frame is two metal plates that are butted against each other,
The cylindrical hole is a hole formed by abutting a first semi-cylindrical portion formed on one of the metal plates and a second semi-cylindrical portion formed on the other metal plate,
A resin valve body characterized by: In a method for manufacturing a resin valve body having a valve bore in which a valve spool is slidably mounted,
a metal frame installation step of installing a metal frame having a cylindrical hole in a cavity space formed by the pair of molds with the pair of molds in an open state;
a mold clamping step of closing the pair of molds;
a slide mold arranging step of arranging a slide mold having a slide pin so that the slide pin is inserted into a cylindrical hole in the cavity space;
a material filling step of filling the molten resin material into the cavity space;
a cooling and solidification step of solidifying the resin material filled in the cavity space by cooling;
a drilling step of cooling and solidifying the resin material and then removing the slide mold to form the inner peripheral surface of the valve bore;
a mold opening step of opening the pair of molds and taking out a resin valve body as a molded product;
A method for manufacturing a resin valve body, characterized by:

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