JP2020112257A - Manufacturing method of valve body, and its manufacturing device - Google Patents

Abstract

To improve circularity of a valve bore and to reduce costs for post-processing simultaneously, in drawing out a slide pin with a drill groove.SOLUTION: A manufacturing method of a lower body 12 having a valve bore 13, has following processes. In a mold clamping process, a mold 3 is closed in a state of inserting a slide pin 82 with a drill groove to a position of the valve bore 13. In a material charging process, a melted resin material A for the lower body 12 is charged into a cavity space of the mold 3 to which the slide pin 82 with the drill groove is inserted. In a cooling/solidifying process, the resin material A charged into the cavity space is solidified by cooling. In a drilling process (time t4), the resin material A of the lower body 12 is cooled and solidified, and then the slide pin 82 with the drill groove is rotated to form the valve bore 13.SELECTED DRAWING: Figure 6

Description

The present disclosure relates to a valve body manufacturing method and a manufacturing apparatus thereof.

In the conventional method of manufacturing a valve body in a spool valve, an axial casting hole is formed when the valve body is molded in the casting hole forming step (see, for example, Patent Document 1).

JP 2015-137751

In the conventional method, when the material is completely solidified during cooling of the material in the step of forming the casting hole, the slide pin for processing the valve bore cannot be removed. Therefore, the slide pin is removed before the material is completely solidified. Therefore, after removing the slide pin, the shape of the valve bore is deformed by heat, and the roundness is reduced. Further, in order to improve the roundness of the valve bore after the casting hole forming step, it is necessary to perform a finishing process by another step after taking out the valve body from the mold. Therefore, there is a problem that a roundness improvement margin is left when the slide pin is pulled out, and a post-processing cost is required.

The present disclosure has been made in view of the above problems, and an object thereof is to improve the roundness of a valve bore when removing a slide pin with a drill groove and reduce the cost of post-processing.

In order to achieve the above-mentioned object, the present disclosure provides a mold clamping step, a material filling step, a cooling and solidifying step, a hole drilling step, in a method of manufacturing a valve body having a valve bore into which a valve spool is movably inserted. Have. The mold clamping step is a step of closing the mold with the slide pin with the drill groove inserted in the position that will be the valve bore. The material filling step is a step of filling the melted valve body material into the cavity space of the mold in which the slide pin with a drill groove is inserted. The cooling and solidifying step is a step of solidifying the valve body material filled in the cavity space by cooling. The hole drilling step is a step in which the valve body material is cooled and solidified, and then the slide pin with a drill groove is rotated to drill a hole in the valve bore.

In this way, it is possible to improve the roundness of the valve bore when pulling out the slide pin with a drill groove and reduce the cost of post-processing at the same time.

3 is a diagram showing an entire valve body of Example 1. FIG. FIG. 3 is a cross-sectional view showing a die casting machine that manufactures the lower body of the valve body of the first embodiment. FIG. 3 is an exploded perspective view showing a die of a die casting machine for manufacturing the lower body of the valve body of the first embodiment. FIG. 3 is a diagram showing a slide type of Example 1. 5 is a time chart 1 showing an operation example of the resin die casting method for manufacturing the lower body of the valve body of the first embodiment. 5 is a time chart 2 showing an operation example of the resin die casting method for manufacturing the lower body of the valve body of the first embodiment.

Hereinafter, the best mode for realizing the method for manufacturing a valve body and the manufacturing apparatus therefor according to the present disclosure will be described based on Embodiment 1 shown in the drawings.

The method for manufacturing a valve body and the manufacturing apparatus therefor in the first embodiment are applied to manufacturing a valve body of a control valve attached to an automatic transmission. Hereinafter, the configuration of Example 1 will be described by being divided into a “valve body configuration”, a “die casting machine configuration”, and an “outline of a resin die casting method”.

The structure of the valve body will be described with reference to FIG.

The valve body 1 is formed of a resin material A (valve body material, see FIG. 2 and the like) and manufactured by a resin die casting method. The resin material A is, for example, PES (polyethersulfone). The valve body 1 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 transmission operating oil (ATF). The lower body 12 has a valve bore 13. A valve spool 14 is movably inserted into the valve bore 13. An orifice plate is provided between the upper body 11 and the lower body 12.

The configuration of the die casting machine will be described based on FIGS. 2 to 4. The die casting machine 2 (manufacturing apparatus for the valve body 1) is supposed to mold the lower body 12 of the valve body 1.

The die casting machine 2 is used for a resin die casting method. The die casting machine 2 has a mold 3 as shown in FIGS. 2 and 3.

The mold 3 molds the molten resin material A in the cavity S of the mold 3 (see FIG. 5). 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 a gas vent hole for venting gas. Here, the cavity space S is a space created by the fixed mold 5, the movable mold 7, and the slide mold 8 by clamping the mold 3.

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

The movable frame 6 is provided so as to be capable of reciprocating in the vertical direction X which is perpendicular to the mating surface of the fixed die 5. Therefore, the movable die 7 operates together with the movable frame 6. Here, the "vertical direction X" means a mold clamping direction X1 in which the movable frame 6 moves to 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 and opens the mold 3. X2. The movable frame 6 is moved by a hydraulic cylinder, and the hydraulic cylinder is controlled by a movable frame controller. The movable die 7 has a movable side cavity 71 and a movable die opening 73. The movable cavity 71 is an engraving surface (space) corresponding to the lower body 12 portion of the movable die 7. The remaining part of the slide die 8 is fitted into the movable die opening 73.

The slide mold 8 is provided so as to be slidable in an orthogonal direction Y (vertical direction, sliding direction) orthogonal to the vertical direction X (mold clamping direction X1). Here, the “orthogonal direction Y” is a downward direction Y1 in which the slide die 8 moves downward and an upward direction Y2 in which the slide die 8 moves upward. The slide die 8 is moved by a hydraulic cylinder, and the hydraulic cylinder is controlled by a slide type controller.

As shown in FIGS. 2 to 4, the slide die 8 has a slide die body 81, a slide pin 82 with a drill groove, and a motor 83. The slide type body 81 and the slide pin 82 with a drill groove are arranged in a space surrounded by the fixed side cavity 51 and the movable side cavity 71, as shown in FIGS. As shown in FIGS. 2 to 4, a motor 83 is provided above the slide type body 81, and a slide pin 82 with a drill groove is provided below the slide type body 81. The slide mold body 81 is fitted into the mold opening 33 formed by the fixed mold opening 53 and the movable mold opening 73. The slide pin 82 with a drill groove has a drill groove 82a. The edge blade formed by the drill groove 82a is used for drilling the valve bore 13. The drill groove 82a discharges the scraps of the edge blade. Here, the edge blade is for shaping the inner surface of the valve bore 13, and the blade having the post-processing accuracy of the inner surface of the valve bore 13 is set. The precision required for the post-processing is the precision of the micron unit. The motor 83 has a motor shaft 83a. The motor 83 is connected to the slide pin 82 with a drill groove inside the slide type main body 81 via the motor shaft 83a. Therefore, the slide pin 82 with a drill groove is rotated by the drive of the motor 83. The drive of the motor 83 is controlled by the motor controller.

An outline of the resin die casting method will be described with reference to FIGS. 5 and 6. 5 and 6, the fixed frame 4 and the movable frame 6 are not shown.

The resin die-casting method is a method of manufacturing the lower body 12 by die-casting, and includes a slide mold placing step (time t1), a mold clamping step (time t2), a material filling step (time t3), and a cooling and solidifying step (time t3 to time). t4), a hole drilling process (time t4), a pre-mold opening process (time t5), and a mold opening process (molded product removing process, time t6). Hereinafter, they will be described in order.

In the slide die arranging step, as shown in FIG. 5, the slide die 8 is placed on the movable die 7 in the mold open state. In the mold clamping process, the movable frame 6 is moved in the mold clamping direction X1 and clamped to the fixed mold 5. In the material filling step, the molten resin material A is filled in the cavity space S from the pouring port 41 through the gate 52. In the cooling and solidifying step, as shown in FIGS. 5 and 6, the resin material A in the cavity space S is solidified by cooling after material filling. In the hole drilling process, as shown in FIG. 6, the slide pin 82 with a drill groove is rotated by the motor 83 to drill the hole in the valve bore 13. In the pre-mold opening step, the slide mold 8 is removed, and the lower body 12, which is a molded product, is in the space surrounded by the fixed cavity 51 and the movable cavity 71. In the mold opening step, the movable frame 6 is moved in the mold opening direction X2 to open the fixed mold 5 and the lower body 12 is taken out.

Next, the operation of the first embodiment will be described. Hereinafter, the operation of the first embodiment will be described by being divided into "the operation operation of the resin die casting method", "the characteristic operation of the lower body manufacturing" and "the other characteristic operation of the lower body manufacturing".

The operation of the resin die casting method will be described with reference to FIGS. 5 and 6.

First, in the slide mold arranging step at time t1, as shown in FIG. 5, the slide mold main body 81 is arranged in the movable mold opening 73 in the mold open state. At this time, the upper portion of the slide die main body 81 is arranged above the movable die opening 73.

Next, in the mold clamping process at time t2, after the slide mold 8 is arranged in the movable mold opening 73 by the slide mold arrangement process, the movable mold 7 is moved in the mold clamping direction X1 and clamped to the fixed mold 5. .. Then, when the mold is clamped, the slide mold body 81 is sandwiched between the fixed mold opening 53 and the movable mold opening 73. Further, the slide pin 82 with a drill groove is inserted into the space surrounded by the fixed side cavity 51 and the movable side cavity 71 at the position that becomes the valve bore 13.

Next, in the material filling process at time t3, after the mold is clamped in the mold clamping process, the slide mold 8 is moved in the downward direction Y1, and the slide mold body 81 is fitted into the mold opening 33. As a result, the slide pin 82 with a drill groove is securely inserted into the space surrounded by the fixed cavity 51 and the movable cavity 71 at the position that becomes the valve bore 13. In other words, the cavity space S in the shape of the molded product before the hole of the valve bore 13 is formed is created. Here, in detail, the cavity space S is a space surrounded by the fixed side cavity 51 and the movable side cavity 71, in which a slide groove 82 with a drill groove is inserted at a position to be the valve bore 13. At this time, the upper surfaces of the fixed die 5, the movable die 7, and the slide die body 81 are flush with each other. Then, the melted resin material A is filled into the cavity space S from the pouring port 41 through the gate 52. More 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 gate 52 by the casting piston. As a result, the resin material A (press-fitted resin material) pressurized from the gate 52 is filled (injected) into the cavity space S.

Next, in the cooling and solidifying step from time t3 to time t4, as shown in FIGS. 5 and 6, after the resin material A is filled in the cavity space S by the material filling step, the resin in the cavity space S is filled. Material A is solidified by cooling. Here, the solidification temperature determined as “solidification” is the temperature at which the fluidity of the material disappears, and 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 appears. The solidification temperature is set by the relationship between the linear expansion coefficient of the material and the mold temperature.

Next, in the hole drilling process at time t4, as shown in FIG. 6, after the resin material A is cooled and solidified by the cooling and solidifying process, the mold clamping state, that is, the resin material A is fixed by the fixed mold 5 and the movable mold 7. In this state, the motor 83 rotates the slide pin 82 with a drill groove. That is, in the mold clamped state, the hole of the valve bore 13 is drilled by the edge blade. At this time, scraps of the edge blade are discharged by the drill groove 82a. Further, the slide pin 82 with a drill groove is pulled out from the resin material A while being moved by the motor 83 in the upward direction Y2 of the slide mold body 81 (in the direction of the arrow in the figure). That is, the drilling of the slide pin 82 with a drill groove and the withdrawal of the slide pin 82 with a drill groove are performed at the same time. Here, the resin material A has a smaller resistance than the metal material when the edge is formed by the edge groove 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, it is possible to form a hole by the edge blade.

Next, in the pre-mold opening step at time t5, the hole has been drilled in the hole drilling step and the slide pin 82 with the drill groove has been pulled out. That is, the slide die 8 is removed from the molded product (lower body 12) on which the valve bore 13 has been processed, and the molded product (lower body 12) is present in the space surrounded by the fixed side cavity 51 and the movable side cavity 71.

Subsequently, in the mold opening process at time t6, after the mold opening pre-process, the movable mold 7 is moved in the mold opening direction X2, and the fixed mold 5 opens the mold. After the mold 3 is opened, the lower body 12 which is a molded product is taken out. Then, the process returns to the slide type arranging step again, and a new lower body 12 is manufactured.

In this way, the inner surface of the valve bore 13 is shaped by the hole forming process from the mold clamping process to the mold opening process. Therefore, the roundness of the valve bore 13 is maintained. Therefore, after the lower body 12 is taken out of the mold 3, post-processing of the valve bore 13 different from the resin die casting method is unnecessary.

Next, the characteristic operation of manufacturing the lower body will be described with reference to FIGS. 5 and 6.

In the first embodiment, after the resin material A is cooled and solidified by the hole drilling process, the slide pin 82 with a drill groove is rotated to drill the hole of the valve bore 13. That is, by rotating the slide pin 82 with a drill groove, the inner surface of the valve bore 13 is shaped by the edge blade. Therefore, the roundness of the valve bore 13 can be improved. As a result, after the slide pin with a drill groove 82 is pulled out, that is, after the lower body 12 is taken out from the mold 3, there is no need for post-processing which is a separate step, so that the processing cost can be saved. Further, by drilling the hole in the valve bore 13 with the edge blade of the slide pin 82 with a drill groove, the slide pin 82 with a drill groove can be removed even after the resin material A has been cooled and solidified, so the shape of the valve bore 13 due to heat Deformation is suppressed.

As a result, it is possible to achieve both improvement of the roundness of the valve bore 13 when removing the slide pin 82 with a drill groove and reduction of the processing cost of the post-processing (finishing). Here, the "processing cost" is the number and cost of processing. The cost is the labor cost when a human performs the processing, and the equipment cost such as machine tools when the machine performs the processing. The cost also includes the material cost of the material scraped by the post processing.

Further, the roundness of the valve bore 13 will be described in detail.

The roundness of the valve bore 13, that is, the processing accuracy, is required to have an accuracy of a micron unit. Therefore, when post-processing is performed after the casting hole forming step as in the conventional method, it takes time such as positioning in order to meet the processing accuracy. If the positioning is incorrect, the molded product itself will be discarded, and the cost (man-hour and cost) for the casting hole forming step will be wasted.

On the other hand, in the first embodiment, since the valve bore 13 is processed while the resin material A is fixed by the fixed die 5 and the movable die 7 in the hole forming step of the resin die casting method, it takes time for positioning and the like. do not do. Further, the edge blade can meet the processing accuracy. Therefore, the valve bore diameter can be accurately controlled. In addition, according to the first embodiment, since the slide pin 82 with a drill groove is used for drilling, the conventional draft for removing the slide pin is not required. Therefore, in the first embodiment, the material cost for the draft can be saved as compared with the conventional method.

Next, another characteristic operation of manufacturing the lower body will be described with reference to FIGS. 5 and 6.

In the first embodiment, in the hole drilling process, the hole in the valve bore 13 is drilled by pulling out the slide pin 82 with a drill groove while rotating it. That is, in the hole drilling process, hole drilling with the slide pin 82 with a drill groove and withdrawal of the slide pin 82 with a drill groove are simultaneously performed. Therefore, it is possible to shorten the time until the lower body 12, which is a molded product, is taken out from the mold 3.

In the first embodiment, after the hole drilling process is completed with the mold 3 closed, the mold 3 is opened and the lower body 12 is taken out in the mold opening process. That is, by performing the hole processing in the mold clamped state, the lower body 12 which is a molded product is fixed by the fixed mold 5 and the movable mold 7. In other words, the fixed die 5 and the movable die 7 function as jigs. On the other hand, if hole processing is performed after opening the mold, it is necessary to fix the lower body 12, which is a molded product, with a jig. In addition, when fixing, the positional relationship between the lower body 12 that is a molded product and the jig may shift. For this reason, the precision of the hole drilling by the slide pin 82 with a drill groove can be improved when the hole drilling process is performed in the mold clamped state rather than in the mold open state. Therefore, the roundness of the valve bore 13 can be improved more when the hole drilling process is performed in the mold clamped state than when the hole drilling process is performed in the mold open state.

In Example 1, the valve body material is the resin material A. Then, in the cooling and solidifying step, the resin material A is solidified by cooling to a temperature at which the fluidity disappears. That is, since the resin material A is cooled and solidified until it loses fluidity, even if the slide pin 82 with a drill groove is rotated and pulled out, the 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 valve body manufacturing method and the manufacturing apparatus therefor according to the first embodiment have the following effects.

(1) In a method of manufacturing a valve body (lower body 12) having a valve bore 13 in which a valve spool 14 is movably inserted, a mold clamping step (time t2), a material filling step (time t3), and a cooling and solidifying step (time t3). It has a time t3) and a hole drilling process (time t4). The mold clamping step (time t2) is a step of closing the mold 3 with the slide pin 82 with a drill groove being inserted into the position that becomes the valve bore 13. The material filling step (time t3) is a step of filling the melted valve body material (the resin material A of the lower body 12) into the cavity space S of the die 3 into which the slide pin 82 with a drill groove is inserted. The cooling and solidifying 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 hole drilling step (time t4) is a step in which the valve body material (resin material A) is cooled and solidified, and then the slide pin 82 with a drill groove is rotated to drill a hole in the valve bore 13. Therefore, it is possible to provide a method of manufacturing the valve body (lower body 12) that achieves both improvement of the roundness of the valve bore 13 when removing the slide pin 82 with a drill groove and reduction of the processing cost of the post-processing.

(2) In the hole drilling step (time t4), the hole in the valve bore 13 is drilled by pulling out the slide pin 82 with a drill groove while rotating it. Therefore, it is possible to shorten the time until the lower body 12, which is a molded product, is taken out from the mold 3.

(3) There is a mold opening process (time t6) in which the mold 3 is opened and the lower body 12 that is a molded product is taken out after the hole drilling process (time t4) is completed with the mold 3 closed. Therefore, the roundness of the valve bore 13 can be improved more when the hole drilling process is performed in the mold clamped state than when the hole drilling process is performed in the mold open state.

(4) Resin material A is used as the valve body material. In the cooling and solidifying step (time t3), the resin material A is solidified by cooling to a temperature at which the resin material A loses its fluidity. Therefore, when the resin material A is used, the roundness of the valve bore 13 can be further improved.

(5) It has a valve bore 13 into which the valve spool 14 is attached so as to be strokeable. The mold 3 is provided in the manufacturing apparatus of the valve body (lower body 12) that is manufactured by casting the valve body (lower body 12) by melting the valve body material (resin material A) into the mold 3. The mold 3 includes a fixed mold 5, a movable mold 7, and a slide mold 8. The fixed die 5 has a fixed side cavity 51 of the valve body (lower body 12). The movable die 7 has a movable cavity 71 of the valve body (lower body 12) and is clamped to the fixed die 5. The slide mold 8 is arranged in a space defined by the fixed cavity 51 and the movable cavity 71, and is slidable in a direction (orthogonal direction Y) orthogonal to the mold clamping direction X1. The slide die 8 has a slide pin 82 with a drill groove for making a hole in the valve bore 13 and a motor 83 for rotating the slide pin 82 with a drill groove.

Thus, the slide die 8 as the die 3 has the slide pin 82 with a drill groove and the motor 83. That is, by rotating the slide pin 82 with a drill groove, the inner surface of the valve bore 13 is shaped by the edge blade. Therefore, the roundness of the valve bore 13 can be improved. As a result, after the slide pin 82 with a drill groove is pulled out, that is, after the lower body 12 is taken out from the mold 3, there is no need for post-processing which is a separate step, so that the processing cost can be saved. Further, by drilling the hole in the valve bore 13 with the edge blade of the slide pin 82 with a drill groove, the slide pin 82 with a drill groove can be removed even after the resin material A has been cooled and solidified, so the shape of the valve bore 13 due to heat Deformation is suppressed. Therefore, it is possible to provide the manufacturing apparatus of the valve body (lower body 12) that achieves both improvement of the roundness of the valve bore 13 when removing the slide pin 82 with a drill groove and reduction of the processing cost of the post-processing.

Although the manufacturing method and the manufacturing apparatus for the valve body of the present disclosure have been described above based on the first embodiment, the specific configuration is not limited to this embodiment, and each claim of the claims is not limited. Modifications and additions of the design are allowed without departing from the gist of the invention related to.

In the first embodiment, an example of manufacturing the lower body 12 having the valve bore 13 into which the valve spool 14 is movably inserted is shown. However, it is not limited to this. In short, it is sufficient to manufacture a valve body having a valve bore into which the valve spool is movably inserted.

In the first embodiment, the example in which the slide die 8 is moved in the downward direction Y1 and the slide die body 81 is fitted in the die opening 33 before the material is filled in the material filling step has been described. However, it is not limited to this. For example, in the slide die arranging step or the die clamping step, the slide die may be moved downward and the slide die body may be fitted into the die opening. In short, it is sufficient to move the slide die downward and fit the slide die main body into the die opening before filling the material.

In the first embodiment, the hole drilling process is an example in which the hole is formed in the valve bore 13 by pulling out the slide pin 82 with a drill groove while rotating. However, it is not limited to this. For example, in the hole drilling process, the slide pin 82 with a drill groove may be pulled out after the hole drilling process in which the slide pin 82 with a drill groove is rotated is completed (slide pin pulling out process).

In the first embodiment, an example is shown in which after the hole forming process is completed with the mold 3 closed, the mold 3 is opened and the lower body 12, which is a molded product, is taken out. However, it is not limited to this. For example, the fixed die 5 and the movable die 7 of the die 3 may be opened before the hole forming step, and then the hole forming step may be performed in the mold open state.

In the first embodiment, an example in which the valve body material is the resin material A is shown. However, it is not limited to this. For example, the valve body material may be aluminum, which is a metal material. Aluminum has higher dimensional accuracy due to heat than resin materials. For this reason, since the temperature at which aluminum loses fluidity is higher than that of the resin material, the solidification temperature is set higher than that of the resin material in the cooling and solidifying step. Even when a metal material is used, the solidification temperature is set by the relationship between the linear expansion coefficient of the material and the mold temperature. In the case of a metal material, the solidification temperature is not limited to the temperature at which the material strength of the material itself appears.

In the first embodiment, the valve body manufacturing method and the manufacturing apparatus thereof according to the present disclosure are the (resin) die casting method and the die casting machine 2. However, it is not limited to this. For example, the valve body manufacturing method and the manufacturing apparatus thereof according to the present disclosure may be a gravity pressure casting method and a casting apparatus. In short, the valve body manufacturing method and the manufacturing apparatus thereof according to the present disclosure may be those manufactured by casting.

In the first embodiment, the example of applying the manufacturing method and the manufacturing apparatus of the valve body of the present disclosure to the manufacturing of the valve body of the control valve attached to the automatic transmission is shown. Further, in the first embodiment, the example in which the hydraulic circuit of the valve body 1 is the circuit of the transmission hydraulic fluid (ATF) has been shown. However, it is not limited to this. In short, the valve body manufacturing method and the manufacturing apparatus therefor of the present disclosure may be applied to a valve body having a valve bore into which a valve spool is movably inserted.

1 Valve body 11 Upper body 12 Lower body (molded product)
13 Valve bore 14 Valve spool 2 Die casting machine (manufacturing equipment)
3 mold 5 fixed mold 51 fixed side cavity 7 movable mold 71 movable side cavity 8 slide mold 82 slide pin with drill groove 82a drill groove 83 motor S cavity space X vertical direction X1 mold clamping direction X2 mold opening direction Y orthogonal direction

Claims (5)

In a method of manufacturing a valve body having a valve bore into which a valve spool is strokeably inserted,
A mold clamping step of closing the mold with the slide pin with a drill groove inserted in the position that becomes the valve bore,
A material filling step of filling the melted valve body material into the cavity space of the mold in which the slide pin with a drill groove is inserted,
A cooling and solidifying step of solidifying the valve body material filled in the cavity space by cooling;
After cooling and solidifying the valve body material, a hole boring step of boring a hole in the valve bore by rotating the slide pin with a drill groove is provided. The method for manufacturing a valve body according to claim 1,
The method of manufacturing a valve body, wherein the hole boring step is performed by boring a hole of the valve bore by pulling out the slide pin with a drill groove while rotating. The method for manufacturing a valve body according to claim 1 or 2, wherein
A method of manufacturing a valve body, comprising: a mold opening step of opening the mold and taking out a valve body, which is a molded product, after the hole drilling step is completed in a mold clamped state with the mold closed. The method for manufacturing a valve body according to any one of claims 1 to 3,
The valve body material is a resin material,
The method of manufacturing a valve body, wherein the cooling and solidifying step solidifies by cooling to a temperature at which the fluidity of the resin material disappears. In a valve body manufacturing apparatus for manufacturing a valve body having a valve bore into which a valve spool is inserted so as to be strokeable by casting by filling molten metal into a mold with a valve body material,
As the mold,
A fixed mold having a fixed side cavity of the valve body,
A movable die having a movable side cavity of the valve body, which is clamped to the fixed die;
A slide mold disposed in a space defined by the fixed cavity and the movable cavity and slidable in a direction orthogonal to the mold clamping direction,
The said slide type|mold has the slide pin with a drill groove|channel which drills the hole of the said valve bore, and the motor which rotates the slide pin with a drill groove|channel, The manufacturing apparatus of the valve body characterized by the above-mentioned.