JP2013244501A - Device body having flow passage in one body, and method of manufacturing the device body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rationally provide a cast device body having a flow passage in a complicated shape.SOLUTION: There is provided a device body 1 that includes: a pipeline member 2 arranged by casting in a base material constituting the device body 1; and at least one pipeline holding part 3 which projects integrally from the pipeline member 2 and is exposed from a surface of the device body 1; wherein a processed flow passage 8 is formed over an outer surface of the device body 1 and the pipeline member 2 by boring the base material constituting the device body 1.

Description

  The present invention relates to an apparatus main body having a pipe member in a state of being integrally cast, and a method for manufacturing an apparatus main body obtained by integrally casting a pipe member inside.

  As this type of cast member, for example, there is one described in Patent Document 1 below. This technique is an engine formed by casting, in which an oil flow path is previously formed inside the engine. For example, the pipe member is closed at both ends, and the engine is cast while the pipe member having a length protruding outward from the cutting surface after casting of the cast member is disposed therein. Both ends are scraped off to allow the hollow portion of the pipe member to communicate with the outside, and this hollow portion is used as an oil passage.

  By using the pipe member whose both ends are closed as described above, the material melted during casting of the cast member is prevented from entering the inside of the pipe member. After casting, both ends of the pipe member are scraped off simultaneously with the cutting of the cast member, and the hollow portion of the pipe member becomes the oil passage as it is, so that the oil passage can be easily formed.

JP 10-8931 A (see paragraphs [0010] to [0011])

  However, in such a casting member forming method, for example, since the pipe is embedded during casting, the shape of the flow path is limited to that obtained by processing the pipe. Therefore, a flow path having a very complicated shape cannot be formed. Moreover, although it is necessary to fix the both ends of a pipe in the state which protruded from the metal mold | die, it is necessary to seal the boundary of a metal mold | die and a pipe reliably so that an internal molten metal may not leak. However, since the inside of the pipe is hollow, the pressing force of the mold against the pipe becomes insufficient, and leakage of the molten metal cannot be reliably prevented. As described above, in the conventional technology, there are still problems to be solved such as the mold structure is easily restricted, it is difficult to obtain a cast member having a complicated flow path, and the casting work is complicated. To do.

  The present invention has been made to solve the above-mentioned problems, and its main object is to rationally provide a casting apparatus main body having a complicatedly shaped flow path.

[First characteristic configuration]
The characteristic configuration of the apparatus main body according to the present invention includes a piping member cast and arranged inside a base material constituting the apparatus main body, and at least one pipe that protrudes integrally from the piping member and is exposed on the surface of the apparatus main body. A holding part, and a processing flow path in which a base material constituting the apparatus main body is perforated across the outer surface of the apparatus main body and the piping member.

(Function and effect)
According to this configuration, after the piping member is cast in a state of being embedded in the apparatus main body and the apparatus main body is formed, a machining flow path extending between the outside of the apparatus main body and the internal space of the piping member is formed. As described above, in order to form the flow path, a flow path using a previously formed piping member and a processing flow path formed by drilling the apparatus main body are combined. Since the machining flow path near the outer surface of the device main body can be formed later by drilling, when forming the internal flow path, prepare a relatively free-form piping member and simply embed it inside the device main body. Good.

  The position of the machining channel provided in the device body is determined by the initial design, but the machining channel corresponding to both ends of the channel is formed by drilling the base material of the device body as in this configuration. Setting of length etc. has a high degree of freedom. Therefore, for example, if the size and shape of the piping member satisfy a certain level of specification, a healthy flow path can be formed by adjusting the perforation length of the processing flow path. In this way, with this configuration, it is possible to form a healthy flow path while giving flexibility to the shape and size of the piping member, so that the manufacturing process can be simplified, and the manufacturing cost of the apparatus body can be reduced. Can be reduced.

Moreover, since the piping holding part which stabilizes the attitude | position of the said piping member is integrally formed in the piping member, when casting a piping member inside an apparatus main body, the attitude | position of a piping member is stably held. be able to. Therefore, the casting operation of the apparatus main body becomes extremely easy, and the positional accuracy and dimensional accuracy of the formed flow path are improved.
Furthermore, since it becomes easy to hold the piping member, the degree of freedom in designing the piping member is increased, so that even complicated piping can be cast into the apparatus body.

[Second characteristic configuration]
In the apparatus main body according to the present invention, the inner diameter of the machining channel and the inner diameter of a portion of the piping member that contacts the machining channel can be formed to be equal.

(Function and effect)
As in this configuration, in particular, by making the inner diameter of the flow path constant at the connecting portion between the piping member and the processing flow path, it is possible to prevent an increase in the flow resistance at this portion, and to smoothly flow the fluid. It can be distributed.
Further, if the inner diameters of both the flow paths are equal, there is no inconvenience such as the foreign substances staying in the connection portion even if foreign substances are circulating in the flow paths. Therefore, a good flow state of the fluid can be maintained for a long time, and a highly reliable apparatus main body can be obtained.

[Third characteristic configuration]
In the apparatus main body according to the present invention, the piping member may include a flange portion in which halved members having a three-dimensional shape are arranged to face each other and the edge portions in contact with each other are joined.

(Function and effect)
The piping member is cast into the apparatus main body to form a fluid flow path inside the apparatus main body. This flow path should just be formed with the base material which comprises an apparatus main body, and provisionally the piping member itself does not need to form the complete pipe line. For example, when the molten metal constituting the apparatus main body is poured into the mold in which the piping member is disposed, the molten metal may not flow into the piping member. For that purpose, no particular inconvenience arises even if a gap of a certain size exists on the surface of the piping member.
Therefore, in this configuration, the piping member is configured by combining half members. At this time, a flange portion is formed on the periphery so that these half members can be easily assembled. With this configuration, for example, in order to form each of the split members, it is possible to press the plate-like member and process it three-dimensionally, and the flange portions can be joined very easily. Yes. Thus, with this configuration, the piping member can be configured very rationally, and as a result, an apparatus main body having a complicatedly shaped flow path can be obtained at low cost.

[Fourth feature configuration]
In the apparatus main body which concerns on this invention, the communicating hole which connects the internal space of the said piping member and the external space of the said apparatus main body can be formed in the said piping holding part.

(Function and effect)
If it is this structure, when the molten metal of the base material which comprises an apparatus main body is poured around the piping member, the air expanded inside the piping member can be discharge | released outside. Therefore, air does not leak into the inside of the device body, and unnecessary cavities are not formed in any part of the device body, so that a quality device with improved quality and a sound device body can be obtained. Can do.

[Fifth feature configuration]
In the apparatus main body which concerns on this invention, the said process flow path can be comprised in the state which a part of said piping holding part leaves adjacent to the said process flow path.

(Function and effect)
In order to obtain the apparatus main body of the present invention, after the casting operation of the apparatus main body is completed, it is necessary to communicate the flow path from the outside of the apparatus main body to the internal piping member. Accuracy is required. In that respect, a pipe holding portion is formed to protrude from the pipe member of this configuration. Since the relative position of the pipe holding part with respect to the pipe member is accurately determined, the machining channel can be formed at an extremely accurate position by drilling with the pipe holding part as a guide. Since a part of the pipe holding part is left adjacent to the processing channel, the position of the processing channel can be easily confirmed, and for example, the efficiency of product inspection can be improved.

[Sixth feature configuration]
In the apparatus main body according to the present invention, the melting point of the material constituting the pipe member and the pipe holding part can be set higher than the melting point of the base material constituting the apparatus main body.

(Function and effect)
If it is this structure, it can reduce more that a piping member fuse | melts at the time of the pouring of the molten metal which comprises an apparatus main body. A piping member can be comprised with a thin material because the possibility of the melting of a piping member falls. As a result, for example, the workability at the time of press-molding the piping member is increased, the processing of a complicated shape is facilitated, and the material cost of the piping member itself is reduced.

[Seventh feature configuration]
The characteristic configuration of the manufacturing method of the apparatus main body according to the present invention is to arrange a piping member that forms a closed space into which the molten metal does not enter when pouring the molten metal of the base material that configures the apparatus main body inside the mold, The mold is clamped in a state of sandwiching a pipe holding part formed integrally protruding from the pipe member, and the molten metal is poured into a cavity formed between the mold and the pipe member, After the molten metal is solidified, a processing flow path is formed by drilling a predetermined portion of the piping member from the outside of the apparatus main body, and an unnecessary portion of the pipe holding portion protruding from the apparatus main body is removed.

(Function and effect)
In this configuration, when the piping member is cast simultaneously with the casting of the apparatus main body, the internal space of the piping member is substantially closed. Here, a substantially closed space means that even if a small hole exists in the piping member, there is only a hole that does not allow the molten metal to enter the pipe during molten metal pouring. It is the meaning including.
As described above, as a result of the piping member having a closed space, the piping member can be set inside the mold in an arbitrary posture. That is, it is necessary to hold the piping member in a place where any end portion of the piping member is open so that the molten metal does not enter the piping member when the molten metal is poured. In this case, it is necessary to accurately seal the joint portion between the mold and the piping member. However, since there is a dimensional error in the piping member, a sealing failure may occur in some cases. Further, since the end of the pipe member of the hollow pipe protrudes from the mold, the mold clamping operation and the apparatus main body taking-out operation after casting become complicated.

  On the other hand, the inside of the piping member used in this method is a substantially closed cavity, and it is not necessary to project the end of the piping member to the outside of the mold. Although it is necessary to hold the pipe holder attached to the pipe body in order to stabilize the posture of the pipe member, this pipe holder does not have a flow path inside, and has a large volume. Therefore, no complication occurs as described above. Thereafter, a machining flow path extending between the piping member and the outer surface of the apparatus main body is formed, and an unnecessary pipe holding portion is cut and deleted to complete the apparatus main body. Thus, according to the manufacturing method of the apparatus main body of this structure, the apparatus main body which has the flow path of a complicated shape can be obtained very rationally.

[Eighth feature configuration]
In the method for manufacturing the apparatus main body according to the present invention, a communication hole that connects the internal space of the pipe member and the external space of the apparatus main body is formed in the pipe holding portion in advance, and the molten metal is solidified. After that, the processing channel can be formed so as to overlap the communication hole.

(Function and effect)
By providing a communication hole in the pipe holding portion as in this configuration, the air inside the pipe member can be discharged to the outside of the apparatus main body when the molten metal is poured around the pipe member. Thereby, inconveniences such as excessive expansion and deformation of the piping member during pouring of the molten metal can be prevented. However, after the casting operation of the apparatus main body is completed, the communication hole needs to be sealed to ensure the sealing performance of the pipe. Thus, by processing the processing channel while overlapping the position of the communication hole as in the present configuration, the sealing work of the communication hole can be omitted, and the manufacturing cost of the apparatus main body can be reduced.

The perspective view which shows the structure of the apparatus main body which concerns on this embodiment The exploded perspective view which shows the structure of the piping member which concerns on this embodiment Sectional drawing which shows the joining structure of the piping member which concerns on this embodiment Sectional drawing which shows the joining structure of the piping member which concerns on another embodiment The perspective view which shows the structure of the apparatus main body which concerns on another embodiment.

(Overview)
The apparatus main body 1 according to the present embodiment includes various housings in which a fluid flow path is integrally formed, for example, an engine for an automobile or motorcycle having an oil flow path, an oil pump or a transmission having an oil flow path, and the like. It is applicable to. The apparatus main body 1 of this embodiment can be obtained as a cast product using various metal materials or an injection-molded product using various metal materials or resin materials. And a flow path formed integrally with the apparatus main body 1.

Hereinafter, an example of an embodiment according to the present invention will be described with reference to the drawings.
In the present embodiment, an example in which the apparatus main body 1 is a part of an engine having an oil flow path (hereinafter simply referred to as “engine main body 1a”) is shown. FIG. 1 is a perspective view of an engine main body 1a having an oil passage formed therein, and FIG. 2 is an exploded perspective view of a piping member 2. FIG.

  The engine body 1a is formed, for example, by casting an aluminum alloy. A piping member 2 made of, for example, general steel is disposed inside. FIG. 1 is a view showing a state in which the piping member 2 is cast into the engine body 1 a, and shows a state in which a drilling operation is performed on an end portion of the piping member 2. The piping member 2 is formed, for example, in a cylindrical shape in order to form an oil flow path. The piping member 2 is provided with a piping holding portion 3 that protrudes integrally from here. The pipe holding unit 3 has a function of stabilizing the posture of the pipe member 2 during casting. By providing the pipe holding part 3, the work of casting the apparatus main body 1 becomes easy. Since the holding of the piping member 2 becomes easy, the degree of freedom of design such as the shape of the piping member 2 is increased. Therefore, even if it is piping of a complicated shape, it becomes possible to cast in the apparatus main body 1 easily.

  As shown in FIG. 2, the piping member 2 is formed by combining two halved members 2a, for example. The piping member 2 becomes an oil flow path 4 inside the engine body 1a by being cast into the engine body 1a.

In order to form the half member 2a, for example, a plate-like member is pressed and processed three-dimensionally. Therefore, the piping member 2 can be configured very reasonably. As a result, the apparatus main body 1 having the complicated-shaped channel 4 can be obtained at low cost.
The piping member 2 is not required to flow into the piping member 2 when the molten metal constituting the apparatus main body 1 is poured into the mold in which the piping member 2 is disposed. Therefore, a gap of a certain size may exist on the surface of the piping member 2.

  The material constituting each half member 2a is selected in accordance with the material constituting the engine body 1a. For example, paying attention to the melting point, a melting point higher than the melting point of the material used for the engine body 1a is used. Thereby, the inconvenience that the piping member 2 is melted by the heat of the molten metal at the time of casting or the like can be avoided.

  Thus, when using a high melting point material, the thickness of the half member 2a can be reduced. As a result, for example, workability in the case where the piping member 2 is formed by pressing a flat plate member is improved, and processing of a complicated shape is facilitated. Furthermore, since less material is used, it is advantageous in terms of cost.

  The respective half members 2a are combined so as to face each other and joined by caulking or the like. Therefore, the half member 2a is formed with a semi-cylindrical portion for forming the flow path 4, and a flange portion 5 is formed on the periphery thereof. The flange portions 5 are positioned so as to face each other, and, for example, both are pressed while forming boss portions that mesh with each other along the flange portions 5 in the form of dots. An example of the cross section obtained by this is shown in FIG.

  In addition, as shown in FIG. 2, the flange portion 5 is formed so that the pipe holding portion 3 projects outward. Although FIG. 2 shows an example in which two pipe holding portions 3 are formed, this number can be appropriately changed according to the size, length, shape, and the like of the pipe member 2. For example, the pipe holding portion 3 may be formed by extending the flange portion 5 with the thickness as it is, or may be thicker than the flange portion 5 in order to ensure strength. In short, a material having a strength capable of reliably holding the pipe holding part 3 in the subsequent casting or injection molding of the molten metal is prepared.

The pipe holding part 3 may be extended only from one member of the half member 2a, or may be joined in the same way from both half members 2a. In particular, when extending from both halved members 2a, as shown in FIG. 2, it is easy to form the communication hole 6 for venting air.
That is, the outer surface of the piping member 2 of the present embodiment is sealed to such an extent that the molten metal does not enter the inside. Therefore, when the piping member 2 is cast, the air inside the piping member 2 expands, and the expanded air may flow to any part of the engine body 1a in some cases to form a cavity. . Therefore, as shown in FIG. 2, a narrow groove is formed on one side of the pipe holding portion 3. This groove is formed to a length that allows communication between the internal space of the piping member 2 and the external space of the engine body 1a. The groove portion becomes the communication hole 6 by joining the two halved members 2a to each other.
In addition, after the engine main body 1a is solidified, the communication hole 6 may be closed by punching the opening of the communication hole 6 or the like.

  By providing such a communication hole 6, the air expanded inside the piping member 2 is discharged to the outside when the molten metal of the base material constituting the engine body 1 a is poured around the piping member 2. Therefore, air does not leak into the engine main body 1a, and a healthy engine main body 1a with no nests can be obtained.

  When the casting process is completed, a machining flow path 8 extending from the outside of the engine body 1a to the piping member 2 using a drill 7 or the like is drilled. At this time, the position where the hole is processed is determined with reference to the position of the pipe holding portion 3 protruding from the engine body 1a. The pipe holding part 3 protruding from the engine main body 1a is deleted when the drilling operation of the machining flow path 8 is completed.

  As shown in FIG. 2, the end of the piping member 2 is configured in a truncated cone shape, for example. This is because if the inner diameter of the machining channel 8 is smaller than the inner diameter of the piping member 2 when the machining channel 8 is drilled after the casting is finished, the inner surface of the channel 4 in the piping member 2 and the engine body This is for continuously changing the inner surface of the machining flow path 8 drilled in 1a to smoothly distribute the fluid. Of course, if the inner diameter of the machining channel 8 and the inner diameter of the portion of the piping member 2 connected to the machining channel 8 are formed to be equal, an increase in internal flow resistance can be prevented. Furthermore, if there is a level difference, foreign matter tends to stay in that portion, but such inconvenience can be prevented by making the inner diameters of both flow paths equal. Therefore, a good flow state of the fluid can be maintained for a long time, and a highly reliable apparatus main body can be obtained.

[Another embodiment]
(1) In joining of the half member 2a which comprises the piping member 2, various methods other than the above-mentioned crimping can be taken. For example, as shown in FIG. 4, the size of one flange portion 5 may be formed larger than the size of the other flange portion 5, and the end portions on the larger side may be folded and joined together.
In addition, the two flange portions 5 can be bonded to each other or can be joined using various welding methods such as spot welding.

(2) The piping member 2 and the piping holding part 3 can also be formed as shown in FIG. That is, the pipe holding part 3 is provided only at both ends of the pipe member 2. Furthermore, the communication hole 6 is provided in at least one of the pipe holding portions 3.
With this configuration, when the machining flow path 8 after the casting operation is drilled, it is only necessary to drill the position of the pipe holding portion 3, so that the drilling position can be specified very easily. After drilling the machining flow path 8, for example, as shown in FIG. 5, a part 3a of the pipe holding portion is left on both sides of the flow path opening. Therefore, it is confirmed whether the machining flow path 8 is formed at an accurate position with respect to the pipe holding portion 3, that is, whether the machining flow path 8 is formed at an accurate position with respect to the flow path 4 related to the piping member. Becomes easy.

  Further, in this configuration, the air vent communication hole 6 formed in the pipe holding portion 3 is removed when the machining flow path 8 is drilled. Therefore, it is not necessary to refill the communication hole 6 after the apparatus main body is completed, and the manufacturing man-hour and manufacturing cost of the apparatus main body can be reduced.

(3) The piping member 2 can also be comprised with the same material as the apparatus main body 1. FIG. The temperature of the apparatus main body 1 changes during use. At that time, if the piping member 2 and the apparatus main body 1 are made of the same material, both expand and contract integrally. Therefore, there is no inconvenience that the piping member 2 is peeled off from the apparatus main body 1 due to the difference in expansion rate, and the flow path 4 can be maintained in a healthy state. As a result, a highly reliable apparatus main body 1 can be obtained. In the case of this configuration, since the piping member 2 is heated until the molten metal is poured after the molten metal is solidified, it is necessary to increase the wall thickness so that the piping member 2 does not melt.

  The apparatus main body of the present invention can be applied to various housings in which fluid flow paths are integrally formed, such as an oil pump or transmission having an oil flow path, in addition to an engine for an automobile or motorcycle having an oil flow path. Applicable.

DESCRIPTION OF SYMBOLS 1 Apparatus main body 2 Piping member 3 Piping holding part 3a Part of piping holding part 6 Communication hole 8 Processing flow path

Claims (8)

A piping member cast and arranged in the base material constituting the apparatus main body;
Projecting integrally from the piping member, and having at least one piping holding portion exposed on the surface of the apparatus main body,
An apparatus body in which a machining flow path is formed by drilling a base material constituting the apparatus body across an outer surface of the apparatus body and the piping member.   The apparatus main body according to claim 1, wherein an inner diameter of the machining channel and an inner diameter of a portion of the piping member in contact with the machining channel are formed to be equal.   The apparatus main body according to claim 1, wherein the piping member includes a flange portion in which halved members having a three-dimensional shape are arranged to face each other and the edge portions in contact with each other are joined to each other.   The apparatus main body according to any one of claims 1 to 3, wherein a communication hole that communicates the internal space of the piping member and the external space of the apparatus main body is formed in the pipe holding portion.   The apparatus main body according to any one of claims 1 to 4, wherein a part of the pipe holding part is left adjacent to the processing channel.   The apparatus main body according to any one of claims 1 to 5, wherein a melting point of a material constituting the pipe member and the pipe holding portion is set to be higher than a melting point of a base material constituting the apparatus main body. A piping member that forms a closed space where molten metal does not enter when pouring molten metal of the base material that constitutes the main body of the apparatus is placed inside the mold, and a piping holding portion that protrudes integrally from the piping member is sandwiched The mold is clamped
Pouring the molten metal into a cavity formed between the mold and the piping member;
After the molten metal is solidified, the apparatus main body removes unnecessary portions of the pipe holding portion protruding from the apparatus main body by forming a processing channel by drilling from outside the apparatus main body at a predetermined position of the pipe member. Production method.   A communication hole that connects the internal space of the piping member and the external space of the apparatus main body is formed in the pipe holding portion in advance, and after the molten metal is solidified, the communication channel is superimposed on the communication hole. The manufacturing method of the apparatus main body of Claim 7 which forms.

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