JPH0655251A - Positioning jig and installation jig for collapsible core - Google Patents

Abstract

PURPOSE:To improve a positioning precision of collapsible core for cylinder bore by providing a provisional core retaining part to provisionally retain a collapsible core in the prescribed direction having the interval corresponding to cylinder thickness in space with the fixed guide for bore as reference. CONSTITUTION:It is a jig for positioning in the prescribed interval and direction plural collapsible cores, which are arranged in a water jacket die forming the water jacket of cylinder block and forms a consecutive water jacket. Plural of the fixed guide for bores 3-6, which are arranged corresponding to a bore number and interval of cylinder block, are provided on a base 2, also, provisional core retaining parts, which provisionally retain the collapsible cores 13-16 in the prescribed direction having the interval corresponding to cylinder thickness in space with the fixed guide for bore, are provided on the base 2. By this method, the collapsible cores 13-16 are arranged precisely and efficiently in the water jacket die.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used to manufacture a cylinder block having a water jacket, and in particular, when manufacturing the cylinder block by a die casting mold equipped with a water jacket mold, the water of the cylinder block is used. For positioning a plurality of collapsible cores, which are mounted between water jacket molds forming a jacket and form a water jacket continuous to the water jacket formed by the water jacket mold, at predetermined intervals and orientations. The present invention relates to a collapsible core positioning jig to be used, and a collapsible core mounting jig to be used for mounting the plurality of positioned collapsible cores between water jacket molds. .

[0002]

2. Description of the Related Art Conventionally, many cast iron cylinder blocks have been adopted for automobile engines, and such cast iron cylinder blocks have been manufactured by using a casting sand molding mold. According to this, many aluminum cylinder blocks have been adopted,
Such an aluminum cylinder block was manufactured by a low pressure casting method.

On the other hand, casting by die casting has also been adopted as a high pressure casting method which is more excellent in productivity than the low pressure casting method and is capable of densifying the structure.

Even in such a cylinder block made of aluminum, it is necessary to form a water jacket for a water-cooled structure. However, when forming the water jacket, the water jacket metal is used so as to withstand a high casting pressure. Since a mold is used, the water jacket is formed with the entire surface open on the cylinder head mounting surface so that the water jacket mold can be satisfactorily demolded after casting. It was.

However, when the water jacket is formed so as to open over the entire surface of the cylinder head mounting surface, the rigidity of the bore becomes low, so that the outer wall side and the inner wall side (that is,
It is preferable to use a closed deck type in which a bridge is connected to the outer wall side of the cylinder), and it is necessary to use a collapsible core in a portion where the bridge is formed (see Japanese Patent Laid-Open No. 1-150456). .

[0006]

As described above, in order to make a closed deck type in which the outer wall side and the inner wall side of the water jacket are connected by a bridge, it is necessary to use a collapsible core. To improve the accuracy and efficiency of mounting the collapsible core between the water jacket molds when mounting the collapsible core between the water jacket molds to form the water jacket by die casting. Was a challenge.

[0007]

SUMMARY OF THE INVENTION The present invention has been conceived in view of the conventional problems as described above, and is intended to form a water jacket by die casting by mounting a collapsible core between water jacket molds. It is an object of the present invention to improve the accuracy and efficiency of mounting the collapsible core between the water jacket molds.

[0008]

The positioning jig for a collapsible core according to the present invention is mounted between water jacket dies forming a water jacket of a cylinder block and formed by the water jacket dies. A jig for positioning a plurality of collapsible cores forming a continuous water jacket on a water jacket at predetermined intervals and orientations, and arranged on a base in correspondence with the number of bores and intervals of the cylinder block. A plurality of bore-corresponding fixed guides and a core temporary holding portion for temporarily holding the collapsible core in a predetermined direction at intervals corresponding to the cylinder thickness are provided between the bore-corresponding fixed guides. It is characterized by that.

Further, the disintegrating core mounting jig according to the present invention is mounted between water jacket molds forming a water jacket of a cylinder block, and is continuously connected to the water jacket formed by the water jacket mold. A jig for mounting a plurality of collapsible cores forming a water jacket between the water jacket molds, the fixed guide corresponding to a bore and a die casting mold provided for a positioning jig for the collapsible core. Of the cylindrical positioning guide, the cylindrical positioning guide having a thickness corresponding to the cylinder thickness, fitted into the bore core provided in the cylindrical positioning guide, and the positioning guide driving body for moving the cylindrical positioning guide forward and backward in the cylinder axis direction. A radial core pressing member for pressing the collapsible core located on the outer peripheral side toward the outer peripheral wall of the cylindrical positioning guide. A cylindrical core pressing member for restricting movement of the collapsible core located on the outer peripheral side of the cylindrical positioning guide in the cylindrical axis direction, the cylindrical positioning guide, the radial core pressing member and the cylindrical shaft The directional core pressing member is configured to include a main driving body that advances and retracts in the cylinder axis direction. In an embodiment adopted as needed, the cylindrical positioning guide is in a state of being held in a floating state. The positioning guide driving body can be moved forward and backward.

[0010]

The positioning jig for the collapsible core according to the present invention is provided with a plurality of bore-corresponding fixed guides corresponding to the number of bores and the intervals of the cylinder block. It serves as a reference when positioning the core, and a core temporary holding part that temporarily holds the collapsible core in a predetermined direction with an interval corresponding to the cylinder thickness between this reference and the bore-corresponding fixed guide. Since it is provided, the collapsible core temporarily held in the temporary core holding portion has high positional accuracy with respect to the cylinder bore.

Further, in the jig for mounting the collapsible core according to the present invention, a cylindrical positioning member which is fitted to the fixed guide corresponding to the bore provided in the positioning jig for the collapsible core and the bore core provided in the die casting mold, respectively. Since it has a guide, this cylindrical positioning guide serves as a reference when the collapsible core is taken out of the positioning jig and mounted between the water jacket molds, and the cylindrical positioning guide is attached to the outer peripheral side. The positioned collapsible core is satisfactorily held by the radial core pressing member and the cylinder axial direction core pressing member, and can be mounted between the water jacket mold accurately and efficiently.

[0012]

1 shows a positioning jig and a mounting jig for a collapsible core according to an embodiment of the present invention, and FIG. 2 shows a mounting of a collapsible core according to the embodiment of the present invention shown in FIG. The jigs are shown in different directions, exemplifying the case applied to the manufacture of a cylinder block of 4 cylinders.

A collapsible core positioning jig 1 shown in FIG.
Are four cylindrical bore-corresponding fixed guides 3, which are arranged on the base 2 in correspondence with the number of bores of the cylinder block and the intervals.
4, 5, 6 and the fixed guide 3, 4, 5, 6 corresponding to the bore
And the groove-shaped temporary holding portions 23, 24, 25 for temporarily holding the collapsible cores 13, 14.15, 16 at an interval corresponding to the cylinder thickness in consideration of heat shrinkage and the like. It has a structure including 26.

In this case, the fixed guides 3 corresponding to the bores at both ends are provided.
In FIG. 6, as shown in FIG. 3, three collapsible cores 13 (13a, 13b, 13c), 16 at 90 ° intervals are used.
(16a, 16b, 16c) are temporarily held for positioning, and in the intermediate bore-corresponding fixed guides 4 and 5, similarly, FIG.
As shown in Fig. 2, two opposing collapsible cores 14 (14
a, 14b) and 15 (15a, 15b) are temporarily held for positioning. Correspondingly, in the portions of the bore-corresponding fixed guides 3 and 6 at both ends, three pieces are provided at 90 ° intervals. The bases 2 are provided with groove-shaped temporary core holding portions 23, 26, and in the intermediate bore-corresponding fixed guides 4, 5 there are two groove-shaped cores each facing each other. The temporary holding portions 24 and 25 are provided on the base 2.

The jig 31 for mounting the collapsible core shown in FIGS. 1 and 2 is a bore-corresponding fixed guide 3, 4, 5, 6 provided in the positioning jig 1 for the collapsible core shown in FIG. The bore cores 103 and 1 provided in the die casting mold 101 shown in FIG.
No. 04, 105, 106, and four cylindrical positioning guides 33, 34, 35, 36, each having a thickness corresponding to the cylinder thickness in consideration of heat shrinkage, etc., and should be broken in FIG. The cylindrical positioning guide 33 at the right end, which shows the inside by means of the
8, the positioning guide drive plate 39 is attached to the positioning guide drive plunger 38.
Is fixed and the other 3 not shown inside in FIG.
The two cylindrical positioning guides 34, 35, 36 are also floating-held via a floating-holding ball plunger (37) with respect to a plunger (38) (not shown) fixed to the positioning guide drive plate 39. The plunger 38 is a rod 40 for advancing and retracting the positioning guide driving body (pressure cylinder) 40, 40.
The positioning guide driving bodies 40, 40 are fixed to the jig base body 41 by integrally forming with the a and 40a.

Further, the dismountable core mounting jig 31 is
A radial direction that presses the collapsible cores 13, 14, 15, 16 located on the outer peripheral side of the cylindrical positioning guides 33, 34, 35, 36 toward the outer peripheral walls of the positioning guides 33, 34, 35, 36. Core pressing member 43, 44, 45, 4
6, and the radial core pressing members 43, 44,
45 and 46 are respectively provided with radial pressing pads 53, 54, 55, via elastic bodies (coil springs, etc.) not shown.
56 is provided.

Then, each radial core pressing member 43, 4
4, 45 and 46 are core pressing members 63, 64,
65, 66 for core presser cylinders 73, 74, 7
5, 76 cylindrical positioning guides 33, 34, 3
The radial pressing pads 53, 54, 55, 56 are configured to be movable in the radial directions of 5, 36, and the core pressing cylinders 73, 74, 75, 76 are pushed out to cause the radial pressing pads 53, 54, 55, 56 to collapse. 14, 15, 16 are pressed against the outer wall surfaces of the cylindrical positioning guides 33, 34, 35, 36.

Furthermore, these core axial direction core pressing members 6
3, 64, 65, 66 are attached to a holding member holding frame 77 via elastic bodies (coil springs or the like) not shown, and a main driving body (pressure cylinder) 80 is attached to the holding member holding frame 77. The rod 79 of is fixed.

Next, the collapsible core 1 with the positioning jig 1 and the mounting jig 31 for the collapsible core having the above-described structure is mounted.
Water jacket mold 10 for positioning 3, 14, 15, 16 and also for die casting mold 101 shown in FIG.
In order to mount between the cores 7, first, in the collapsible core positioning jig 1 shown in FIG. 1, the groove-shaped core temporary holding portions 23, 24, 25, 26 provided on the base 2 are respectively mounted. The collapsible cores 13, 14, 15 and 16 are fitted to each other and a total of 10 pieces are temporarily held.

Next, the positioning guide driving body (pressure cylinder) 40 is set to the extrusion operation state, the main driving body (pressure cylinder) 80 is set to the extrusion operation state, and the core pressing cylinders 73, 74, 75, 76 are retracted. In the operating state, the radial core pressing members 43, 44, 45, 46 are retracted and opened, and the cylindrical positioning guides 33, 34,
35, 36, radial core pressing member 43, 44, 45, 4
6, the cylinder axial direction core pressing member 63, 64, 65, 66, etc. is lowered as a whole, and each cylindrical positioning guide 33, 3
After inserting 4, 35, 36 into the gap between the bore-corresponding fixed guides 3, 4, 5, 6 and the collapsible cores 13, 14, 15, 16, the descent is stopped.

At this time, the bore-corresponding fixed guides 3, 4,
If the shapes of 5 and 6 are made slightly tapered and the height is made higher than the height of the collapsible cores 13, 14, 15 and 16, smooth insertion can be performed.

Then, the core pressing cylinders 73, 74,
75 and 76 are pushed out, and the cylindrical positioning guide 3
Collapsible core 1 located on the outer peripheral side of 3, 34, 35, 36
3, 14, 15, 16 are pressed to the pads 53, 54, 5
Cylindrical positioning guides 33, 34, 3 by 5, 56
It presses toward the outer peripheral surface of 5,36.

Subsequently, in this state, the entire mounting jig 31 is pulled up from the positioning jig 1 by a robot or the like and moved to the vicinity of the die casting mold 101. At this time, each collapsible core 1 temporarily held on the base 2 of the positioning jig 1
3, 14, 15 and 16 are core temporary holding portions 23, 24 and 2
5, 26, away from the radial core pressing members 43, 44, 4
5, 46 is pressed by the cylindrical positioning guide 33,
It is conveyed while being in close contact with the outer peripheral walls of 34, 35 and 36.

Next, in the die casting mold 101 shown in FIG. 4, the cylindrical positioning guides 33, 34, 35, 36 are fitted to the bore cores 103, 104, 105, 106, and the collapsible cores 13, 14, The tip portions of 15 and 16 are fitted between the water jacket molds 107 and 107.

At this time, the water jacket mold 10
7, 107 has a taper shape in which the distance on the tip side is slightly increased and the distance is decreased on the base side, and the collapsible cores 13, 14, 15, 16 are provided.
In addition, the width of the tip side is slightly smaller and the width becomes slightly larger toward the opposite side, so that the collapsible core 13, 14, 15, 16 is provided between the water jacket molds 107, 107. The workability when fitting the tip of the is improved.

Then, as shown in phantom in FIG. 4, the tips of the collapsible cores (13, 14, 15) and 16 are stepped portions 107a and 107 of the water jacket molds 107 and 107.
When it hits a, the movement of the mounting jig 31 is stopped,
Subsequently, the core pressing cylinders 73, 74, 75, 76 are retracted to cause radial core pressing members 43, 44, 45,
The cylinder positioning guide 33, 34, 35, 36 is moved to the open state by retracting 46, and then the positioning guide driving body 40 is retracted to move the cylindrical positioning guides 33, 34, 35, 36.
No. 01 bore core 103, 104, 105, 106. At this time, collapsible cores 13, 14, 15, 16
Is pressed by the core pressing members 63, 64, 65, 66 in the cylinder axial direction, so that the cylindrical positioning guide 33,
It does not move with the retreat of 34, 35, 36.

After that, the main drive body 80 is retracted and actuated to open the radial core pressing members 43, 44, 45, 46.
The cylindrical core pressing members 63, 64, 65, 66 are retracted so that the collapsible cores 13, 14, 15, 16 are left between the water jacket molds 107, 107.

In this state, the water jacket molds 107, 107 and the collapsible cores 13, 14, 15, 16
4, a space 108 as shown in FIG. 4 is formed, and a molten metal is also cast in the space 108 during die casting to form a bridge portion connecting the outer wall and the inner wall of the water jacket.

[0029]

The positioning jig for a collapsible core according to the present invention is provided with a plurality of bore-corresponding fixed guides corresponding to the number of bores and intervals of the cylinder block. Equipped with a temporary core holding part that temporarily holds the collapsible core in a predetermined direction with a gap corresponding to the cylinder thickness between it and the bore-corresponding fixed guide that serves as a reference for positioning the core. With this configuration, the collapsible core temporarily held in the temporary core holding portion has high positional accuracy with respect to the cylinder bore.

Further, in the jig for mounting the collapsible core according to the present invention, a cylindrical positioning member which is fitted to the fixed guide corresponding to the bore provided in the positioning jig for the collapsible core and the bore core provided in the die casting mold, respectively. Since the guide is equipped with a guide, this cylindrical positioning guide serves as a reference when the collapsible core is taken out of the positioning jig and mounted between the water jacket molds. Since the collapsible core located on the side is well retained by the radial core pressing member and the cylinder axial direction core pressing member, each of the collapsible cores can be accurately positioned between the water jacket mold and In addition, there is a remarkably excellent effect that the device can be worn efficiently.

[Brief description of drawings]

FIG. 1 is an explanatory view of a slope of a positioning jig and a mounting jig for a collapsible core according to an embodiment of the present invention.

FIG. 2 is an explanatory view of a slope from another angle of the jig for mounting the collapsible core according to the embodiment of the present invention.

FIG. 3 is an explanatory view showing a state in which a collapsible core is positioned and held on the outer peripheral surface of a cylindrical positioning guide.

FIG. 4 is an explanatory view of a slope of a die casting mold.

[Explanation of symbols]

 1 Collapsible core positioning jig 2 Base 3, 4, 5, 6 Fixed guide for bore 13, 14, 15, 16 Collapsible core 23, 24, 25, 26 Core temporary holding part 31 Collapsible middle Child mounting jig 33, 34, 35, 36 Cylindrical positioning guide 37 Floating holding ball plunger 40 Positioning guide driver 43, 44, 45, 46 Radial core pressing member 53, 54, 55, 56 Radial pressing Pads 63, 64, 65, 66 Cylinder axis direction core pressing member 80 Main driver 101 Die casting mold 103, 104, 105, 106 Bore core 107 Water jacket mold

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takuya Arakawa 503 Kitahama, Oguchi Town, Matsusaka City, Mie Prefecture Aichi Machine Industry Co., Ltd.

Claims (3)

[Claims] 1. A plurality of collapsible cores, which are mounted between water jacket molds forming a water jacket of a cylinder block to form a water jacket continuous with the water jacket formed by the water jacket mold. A jig for positioning at the intervals and orientations of the cylinder block between the plurality of bore-corresponding fixed guides arranged on the base in correspondence with the number and intervals of the cylinder block bores A collapsible core positioning jig, comprising a core temporary holding portion for temporarily holding the collapsible core in a predetermined direction at intervals corresponding to the thickness. 2. A plurality of collapsible cores mounted between water jacket molds forming a water jacket of a cylinder block to form a water jacket continuous with the water jacket formed by the water jacket mold. A jig for mounting between water jacket molds, which is fitted to the bore-corresponding fixed guide provided in the positioning jig for the collapsible core and the bore core provided in the die casting mold, and has a cylinder thickness A cylindrical positioning guide having a corresponding thickness, a positioning guide driving body for moving the cylindrical positioning guide forward and backward in the cylinder axis direction, and a collapsible core positioned on the outer peripheral side of the cylindrical positioning guide. A radial core pressing member that presses toward the outer peripheral wall of the guide, and an outer peripheral side of the cylindrical positioning guide. A cylindrical core pressing member for restricting the movement of the collapsible core in the cylindrical axis direction, and the cylindrical positioning guide, the radial core pressing member, and the cylindrical axial core pressing member are moved forward and backward in the cylindrical axis direction. A jig for mounting a collapsible core, which is equipped with a main driving body. 3. The collapsible core mounting jig according to claim 2, wherein the cylindrical positioning guide is moved forward and backward by a positioning guide driving body while being held in a floating state.