JPH10263792A - Casting structure and cast parts - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fix an insert member to a mold without providing a core print by aligning the axial direction of a guide rail part to fix the insert member to a casting mold with the snapping direction of the mold, and making the insert member a part of the casting after the casting is completed. SOLUTION: A fixed part 8 extending in the direction orthogonal to the direction parallel to a groove 6 is provided outside a side part of the groove 6 provided in an insert member 7. Projected parts 9 are provided above and below the outside of the fixed parts, and a guide rail part 3 is formed by a flat part in the middle of the projected part 9 in the vertical direction and a flat part 10 on each side of the fixed part 8. The insert member 7 is inserted in a fixed die, and connected to a movable die, and the insert member 7 is fixed by the fixed die and the movable die, and the insert member 7 can be correctly cast. Because the axial direction of the guide rail part 3 is aligned with the snapping direction of the casting mold, the fixed die can surely be snapped. The guide rail part 3 is exposed on the face side of the casting, and functions as a part of the casting.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casting structure and a casting part used for fixing an insert member to a casting mold when the insert member is cast into a cast member.

[0002]

2. Description of the Related Art For example, when a part formed by aluminum die casting requires strength and wear resistance, a technique of casting a member made of a material different from an aluminum alloy at the time of casting is known. ing.

At this time, as a device (means) for fixing a member to be cast (hereinafter referred to as an insert member) in a casting mold, for example, as shown in FIG. 6, a projection 25 generally called habaki is used. In general, a technique of providing the insert member 7 and fixing the cutout 25 by engaging the cutout 25 with a concave portion 26 provided in a casting mold is also performed. Incidentally, the above-mentioned technique using habaki is similarly used as a technique for fixing a core to a casting mold when casting a pipe-like or hollow casting.

[0004]

Here, in the above technique, the habaki 25, which fixed the insert member 7 at the time of casting, is unnecessary and obstructive after casting. Also, the weight of the product will increase by the amount of Habaki. Therefore, according to the conventional technique, it is necessary to cut habaki after casting (see FIG. 7).

[0005] However, there is a problem that cutting habaki after casting deteriorates productivity and causes an increase in cost.

In Japanese Utility Model Laid-Open Publication No. 2-71169,
Although a technique for partially improving wear resistance by spot irradiation has been disclosed, the above-described problem cannot be solved.

The present invention has been proposed in view of the above-mentioned problems of the prior art, and has as its object to provide a casting structure and a casting part which can fix an insert member to a casting mold without providing a saw blade. I have.

[0008]

The casting structure according to the present invention comprises a casting mold and an insert member, and is used for casting an insert member into a cast part.
A guide rail portion for fixing the insert member to the casting mold is provided on the insert member, and the guide rail portion has an axial direction corresponding to a direction in which the casting mold is removed, and as a part of the cast component after casting. The casting mold has an insert fixing portion which is configured to function and engages with the guide rail portion.

The cast component of the present invention is a cast component obtained by casting an insert member, wherein the insert member has a guide rail portion which engages with an insert fixing portion of a casting mold used at the time of casting. The guide rail portion is provided so that its axial direction coincides with the drawing direction of the casting mold, and is configured so as to function as a part of a cast component as it is after casting.

According to the present invention having the above-described structure, the habaki and the concave portion for receiving the habaki are unnecessary. Therefore, the step of cutting habaki after casting is unnecessary. Also, since there is no cut surface of Habaki, the finished product is good. Therefore, productivity is good, and it is possible to contribute to weight reduction of parts and cost reduction.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. In the accompanying drawings, the same members as those in the related art are denoted by the same reference numerals, and redundant description is omitted.

FIG. 1 shows an embodiment of a cast structure and a cast part according to the present invention, in which a shift fork of a transmission is applied as a product. Shift fork 1 die-cast with aluminum alloy
, An insert member 7 made of steel is cast-in, and guide rail portions 3 are provided on both side surfaces of the insert member 7. Here, reference numeral 4 denotes a fork shaft hole, and reference numeral 5 denotes a fork, respectively.

FIG. 2 is a view taken in the direction of the arrow A in FIG. 1. A groove 6 for engaging a shift lever (not shown) is provided on the side of the fork shaft hole 4, and cast iron is used for engaging with a steel shift lever. Is inserted.

The insert 7 is clearly shown in FIG. In FIG. 3, the width b of the groove 6 is the same as the width of this part of the product (shift fork 1), that is, the width B of this part of the mold S shown in FIG. Here, the mold S shows only a portion for inserting an insert member as a schematic diagram, and is therefore different from the mold for die-casting the shift fork 1. And, it is described as showing the first mold S (in this case, a fixed mold, that is, a casting mold).

On the outer side of the side of the groove 6, there are provided fixing portions 8, 8 extending in a direction (Y direction in FIG. 3) perpendicular to a direction parallel to the groove 6 (X direction in FIG. 3). The dimension c of the fixing portions 8 in the X direction is smaller than the width a of the groove 6. Here, the fixing portions 8, 8 are provided in order to prevent the insert member 7 from moving after casting.

Outside the fixing portion 8, projections 9 are provided vertically. Then, the flat portions in the vertical direction between the protruding portions 9 and 9 and the flat portions 10 and 10 on both sides in the X direction of the fixed portion 8.
Thus, the guide portions 3 are formed. The width c of the guide portion 3 is set to the same dimension as the interval C of the insert fixing portion 15 of the mold S. The vertical interval d of the guide portion 3 is formed to have the same dimension as the height D of the insert fixing portion 15 of the mold S. When the insert member 7 is inserted into the mold S, the width B portion is engaged with the guide portion 3 and the insert fixing portion 15 to be positioned.

Further, a center plane p of the insert member 7 in the left-right direction (X direction in FIG. 3) coincides with a parting surface (boundary surface) P between the first mold S and a second mold (not shown). , The center plane p is the center (or plane of symmetry) of the insert member 7.

Therefore, the insert member 7 is connected to the first mold S
(Fixed mold), and a second mold (movable mold) (not shown) is connected to the first mold S, so that the second mold is provided with an insert fixing portion similarly to the first mold S. Therefore, the insert member 7 is fixed by the first and second molds, and the insert member 7 can be cast accurately. Then, the product (that is, the cast part according to the present invention) has no extra protrusions as shown in FIG.

In FIG. 5, reference numeral 20 denotes an aluminum alloy portion, and the aluminum alloy portion 20 does not rattle because the corresponding portion of the insert member 7 is sufficiently molded. In addition, the cross-sectional shape of the guide portion 3 is not limited to a rectangular cross-sectional groove, and the shape is not limited.
It is preferable that the shape is not arc-shaped because the accuracy may be degraded due to deviation.

In addition to this, as is apparent from FIGS. 3 to 5, the guide rails 3, 3 have their axial direction (the direction of the arrow Y in FIG. 3) coincident with the drawing direction of the casting mold. In the operation of extracting the one mold S, the insert member 7 and the aluminum alloy portion 20 do not interfere with the mold S.
In other words, the die-cutting operation is performed easily and reliably.

As is apparent from FIGS. 1 and 2, after the guide rails 3 and 3 are cast (after the insert member 7 is cast with an aluminum alloy), the shift fork 1 of the transmission, which is a cast component, is used. And is configured to function as a part thereof.

[0022]

The present invention is configured as described above,
The following excellent effects are achieved. (1) The step of cutting habaki after casting is unnecessary. (2) Since there is no cut surface of Habaki, the finished product is good. (3) Therefore, the productivity is good, the weight of parts can be reduced, and the cost can be reduced. (4) Since the axial direction of the guide rail portion coincides with the direction of removal of the casting mold, the operation of removing the first mold can be performed easily and reliably without interference, without interference. (5) The guide rail functions as a part of the cast component after casting.

[Brief description of the drawings]

FIG. 1 is a front view of a shift fork showing an embodiment of the present invention.

FIG. 2 is a view as viewed in the direction of arrow A, showing a main part of FIG. 1;

FIG. 3 is a perspective view showing the insert member of FIG. 1;

FIG. 4 is a schematic view of a first mold showing only a cast-in portion of an insert member.

FIG. 5 is a perspective view showing only a cast-in part of a product.

FIG. 6 is a view showing only a first mold insert portion and an insert member according to the prior art.

FIG. 7 is a diagram showing a state where habaki is cut.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Shift fork 3 ... Guide rail part 4 ... Fork shaft hole 5 ... Fork 6 ... Groove 7 ... Insert member 8 ... Fixed part 9 ... Projection part 10. ..Flat portions 15 ・ ・ ・ Insert fixing portions 20 ・ ・ ・ Aluminum alloy portions 25 ・ ・ ・ Habaki

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Akihide Shibusawa 2-1-2 Marunouchi, Chiyoda-ku, Tokyo Inside Hitachi Metals Co., Ltd.

Claims (2)

[Claims] 1. A method comprising: a casting mold and an insert member;
In a casting structure used when casting an insert member into a cast part, a guide rail portion for fixing the insert member to a casting mold is provided on the insert member, and the guide rail portion is formed by casting in the axial direction. The casting mold is provided so as to correspond to the direction of removal of the mold and to function as a part of the cast part after casting, and an insert fixing portion engaging with the guide rail portion is provided in the casting mold. Construction. 2. In a cast part obtained by casting an insert member, said insert member has a guide rail portion which engages with an insert fixing portion of a casting mold used at the time of casting. A cast part, wherein the rail part is provided so that its axial direction coincides with the drawing direction of the casting mold, and is configured to function as a part of the cast part as it is after casting.