JP4224232B2 - Cylinder head casting equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cylinder head casting apparatus having a casting pin for casting a camshaft journal hole of a cylinder head.
[0002]
[Prior art]
In general, a camshaft journal hole for supporting a camshaft is provided in a cylinder head constituting an internal combustion engine. For this reason, when casting the cylinder head, a pin-shaped core corresponding to the camshaft journal hole is used.
[0003]
For example, a casting apparatus disclosed in Japanese Patent Laid-Open No. 2-59141 includes a lower mold 1 and an upper mold 2 as shown in FIG. 9, and the lower mold 1 includes a plurality of protrusions 3. Through-holes 4 are integrally formed. On the cavity forming surface side of the upper mold 2, an outer wall forming block 5 is provided between the outer wall forming position and the mold releasing position so as to advance and retreat under the action of the cylinder 6.
[0004]
The block 5 can be engaged with and disengaged from the rod 6a of the cylinder 6 through an intermittent mechanism 7, and a pin-shaped core 8 for forming a camshaft journal hole is connected to the rod 6a. A recess 9 is formed in the middle of the pin-shaped core 8, and a locking mechanism 10 attached to the lower mold 1 can be engaged with the recess 9 when the mold is clamped.
[0005]
[Problems to be solved by the invention]
However, the above-described prior art includes an interrupting mechanism 7 for engaging and disengaging the block 5 with the rod 6a of the cylinder 6, and a locking mechanism 10 for fixing the pin-shaped core 8 to the cavity when the mold is clamped. The intermittence mechanism 7 and the locking mechanism 10 include elevating cylinders 11 and 12, respectively. For this reason, there exists a problem that a structure becomes complicated as the whole casting apparatus, the number of parts increases, and the manufacturing cost of the said casting apparatus rises.
[0006]
In view of this, it is considered to cast the camshaft journal hole in a subsequent process without casting the pin-shaped core 8 or the like, and to form the camshaft journal hole in a subsequent process. However, it is pointed out that the machining allowance in the hole machining increases, and the machining work becomes complicated and time consuming.
[0007]
The present invention solves this type of problem, and can easily and reliably cast the camshaft journal hole of the cylinder head with a simple and inexpensive configuration, and the cylinder head can be obtained economically. An object of the present invention is to provide a cylinder head casting apparatus.
[0008]
[Means for Solving the Problems]
In the cylinder head casting apparatus according to the present invention, first, a pair of first sliding molds facing each other in the axial direction of the camshaft journal hole and a pair of castings slidable with respect to the first sliding mold. While the pin slides in a direction close to each other (clamping direction) via the drive mechanism, a pair of second sliding molds facing each other in the radial direction intersecting the axial direction is also in the mold clamping direction. Slide. For this reason, the first and second locking members provided in the first and second sliding molds are engaged with each other, and the first sliding mold is restrained at a predetermined position. Here, the drive mechanism includes a cylinder and a pressing block body attached to the cylinder and to which the core pin and the guide rod are fixed. The first sliding mold is provided with a hole for slidably fitting the core pin and a stepped hole into which the head of the guide rod is inserted. As the cylinder advances, the pressing block body, the core pin, and the guide rod advance, and the pressing block body presses the first sliding mold in the axial direction, thereby the first sliding mold. Will move forward.
[0009]
Next, under the action of the drive mechanism, only the core pin moves in the axial direction away from each other, and then another mold (for example, the upper mold) is clamped to the first and second sliding molds. In this state, the pair of core pins move in the direction approaching each other under the action of the drive mechanism, and a desired cylinder head cavity is formed. Furthermore, after the molten metal is poured into the cavity and casting is performed, the cast pin is retracted and the cylinder head having the camshaft journal hole is cast by performing the mold release process. It will be. The first sliding type is retracted by retracting the guide rod as the cylinder is retracted, and the head of the guide rod engages with the stepped portion of the stepped hole portion of the first sliding type. Do by pulling.
[0010]
Thus, it is not necessary to use an actuator when fixing the core pin to the first sliding mold, and an actuator for fixing the first sliding mold to the second sliding mold is unnecessary. Become. Therefore, the configuration of the entire casting apparatus is effectively simplified, the number of partial points can be greatly reduced, and the casting apparatus can be manufactured economically.
[0011]
In addition, since the camshaft journal hole is cast through a pair of core pins, the work is simplified and the working time is shortened compared to the conventional method in which the camshaft journal hole is processed by a hole process in a later process. Easy to plan.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a schematic perspective view of a cylinder head casting apparatus 20 according to an embodiment of the present invention, FIG. 2 is a partial sectional plan view of the casting apparatus 20, and FIG. FIG.
[0013]
FIG. 4 is a partial cross-sectional view of a cylinder head material 22 cast by the casting apparatus 20. The cylinder head material 22 includes outer wall portions 24a and 24b and partition wall portions 26a, 26b, and 26c. Tapered holes 28a, 28b, and 28c that are reduced in diameter from the outer wall portion 24a side toward the partition wall portions 26a and 26b are formed, and tapered holes 30a that are reduced in diameter from the outer wall portion 24b side toward the partition wall portion 26c, respectively. 30b is formed. The camshaft journal hole 32 is constituted by the tapered holes 28a to 28c, 30a and 30b.
[0014]
The diameter of the reduced diameter side end of the tapered hole 28a and the diameter of the enlarged diameter end of the tapered hole 28b are set to the same dimension, and the diameter of the tapered diameter end of the tapered hole 28b and the diameter expanded side of the tapered hole 28c. The end diameter is set to the same dimension, and the diameter-reduced side end diameter of the tapered hole 30a and the diameter-expanded end diameter of the tapered hole 30b are set to the same dimension.
[0015]
As shown in FIGS. 1 to 3, the casting apparatus 20 includes a fixed lower mold 40, an upper mold 42 that can be moved up and down, first sliding molds 44 a and 44 b that can move forward and backward in the direction of arrow A, and an arrow A. A pair of second sliding dies 46a and 46b that can advance and retreat in the direction of arrow B intersecting (orthogonal) with the direction is provided, and these are clamped to form a cavity 48 corresponding to the cylinder head material 22. .
[0016]
The first sliding type 44a corresponds to the transmission case side of the cylinder head, the first sliding type 44b corresponds to the timing chain (or timing belt) side, and the second sliding type 46a corresponds to the intake side, Further, the second sliding mold 46b corresponds to the exhaust side.
[0017]
The lower mold 40 is provided with, for example, pouring gates 50 at four locations. The pouring gates 50 communicate with a molten metal storage sealed container (not shown) to constitute a casting apparatus 20 for low pressure casting.
[0018]
As shown in FIG. 3, the upper mold 42 protrudes toward the cavity 48 and has a plurality of protrusions for forming a space between the outer wall portions 24 a and 24 b of the cylinder head material 22 and the partition wall portions 26 a to 26 c. 52a to 52d are provided, and the protrusions 52a, 52b and 52d are provided with holes 54 penetrating in the axial direction (direction of arrow A) of the camshaft journal hole 32, respectively.
[0019]
As shown in FIG. 1, first guide rails 56 a and 56 b are provided on the lower mold 40 on both sides of the cavity 48 in the direction of arrow A, and extend in the direction of arrow B across the cavity 48. A set of second guide rails 58a and 58b is provided. First sliding dies 44a and 44b are disposed on the first guide rails 56a and 56b.
[0020]
The first sliding dies 44a and 44b are provided with a pair of core pins 60a and 60b that are slidable in the direction of arrow A, and the core pins 60a and 60b are connected via drive mechanisms 62a and 62b. Can be advanced and retracted in the direction of arrow A. The drive mechanisms 62a and 62b include cylinders 64a and 64b, and rods 66a and 66b extending from the cylinders 64a and 64b in the direction of the arrow A and close to each other via the fixing members 68a and 68b. 70b are fixed.
[0021]
As shown in FIG. 1 to FIG. 3, cast pins 60a and 60b are fixed to the pressing block bodies 70a and 70b, and guide rods 72a and 72b are located on both sides of the cast pins 60a and 60b. Screw together. The first sliding dies 44a and 44b have holes 74a and 74b into which the core pins 60a and 60b are slidably fitted, and a pair of stepped holes located on both sides of the holes 74a and 74b. Portions 76a and 76b are provided. The heads 78a and 78b of the guide rods 72a and 72b are inserted into the stepped holes 76a and 76b, and the heads 78a and 78b can be freely engaged with the ends of the stepped holes 76a and 76b. It is.
[0022]
The second sliding dies 46a and 46b supported by the second guide rails 58a and 58b are connected to rods 82a and 82b extending from the cylinders 80a and 80b in the direction of arrow B and close to each other, respectively. The first sliding molds 44a and 44b and at least one of the second sliding molds 46b are engaged with each other at the time of mold clamping so as to restrain the first sliding molds 44a and 44b at a predetermined position. Stop members 84a and 84b and second locking members 86a and 86b are provided.
[0023]
As shown in FIG. 2, the first locking members 84a and 84b are provided on the surface of the first and second sliding molds 44a and 44b facing the second sliding mold 46b, and the second sliding members The block body has first tapered surfaces 88a and 88b inclined toward the cavity 48 toward the mold 46b. The second locking members 86a and 86b are inclined in a direction away from the cavity 48 toward the first sliding dies 44a and 44b, and the second tapered surfaces 90a and 90b engaged with the first tapered surfaces 88a and 88b are formed. It has a block body.
[0024]
The second locking members 86a and 86b may be provided in the second sliding mold 46a in place of the second sliding mold 46b or together with the second sliding mold 46b.
[0025]
As shown in FIG. 5, the cooling pins 94a and 94b are formed in the cored pins 60a and 60b through the pipes 92a and 92b, respectively. The cooling channels 94a and 94b are connected to the inlet pipe 96a. 96b and outlet conduits 98a, 98b. The outer shape of the core pins 60a and 60b corresponds to the camshaft journal hole 32. The core pin 60a has a tapered shape corresponding to the taper holes 28a, 28b and 28c, while the core pin 60b has a taper shape. It has a tapered shape corresponding to the tapered holes 30a, 30b.
[0026]
The operation of the casting apparatus 20 configured as described above will be described below based on the flowchart shown in FIG.
[0027]
The first sliding type 44a corresponds to the transmission case side of the cylinder head, the first sliding type 44b corresponds to the timing chain (or timing belt) side, and the second sliding type 46a corresponds to the intake side, Further, the second sliding mold 46b corresponds to the exhaust side.
[0028]
Therefore, first, the driving mechanisms 62a and 62b are driven, and the pressing block bodies 70a and 70b are moved in directions close to each other via the cylinders 64a and 64b. For this reason, the core pins 60a and 60b are moved to the first sliding molds 44a and 44b integrally with the pressing block bodies 70a and 70b, and the core pins 60a and 60b are moved to the first sliding mold 44a, It protrudes from 44b to the cavity 48 side. In this state, the first sliding dies 44a and 44b move forward toward the cavity 48 under the pressing action of the pressing block bodies 70a and 70b (see step S1 and FIG. 7).
[0029]
Next, the cylinders 80a and 80b are driven, and the second sliding dies 46a and 46b move forward (step S2). Accordingly, the second locking members 86a and 86b provided on the second sliding mold 46b are related to the first locking members 84a and 84b provided on one side surface of the first sliding molds 44a and 44b. Match. Accordingly, the first and second tapered surfaces 88a, 88b and 90a, 90b are engaged with each other, and the first sliding molds 44a, 44b are held by the second sliding molds 46a, 46b and are restrained at a predetermined position. .
[0030]
In this state, the cylinders 64a and 64b constituting the drive mechanisms 62a and 62b are driven, and the rods 66a and 66b are displaced in directions away from each other. The pressing block bodies 70a and 70b connected to the rods 66a and 66b retreat with respect to the first sliding molds 44a and 44b under the guiding action of the guide rods 72a and 72b and the stepped holes 76a and 76b. For this reason, the core pins 60a and 60b fixed to the pressing block bodies 70a and 70b retreat with respect to the first sliding dies 44a and 44b (see step S3 and FIG. 8).
[0031]
Then, the upper mold 42 is lowered, and the upper mold 42 is clamped to the lower mold 40, the first sliding molds 44a and 44b, and the second sliding molds 46a and 46b (step S4). Next, under the driving action of the cylinders 64a and 64b, the pressing block bodies 70a and 70b move to the first sliding molds 44a and 44b, and advance the core pins 60a and 60b (step S5). For this reason, the core pins 60a and 60b are inserted from both sides into the holes 54 formed in the plurality of protrusions 52a to 52d of the upper mold 42 (see FIG. 3).
[0032]
Thereby, the casting apparatus 20 is clamped and a cavity 48 is formed inside the casting apparatus 20. Further, when molten metal is supplied to the plurality of gates 50 by the low pressure casting method, the molten metal is filled into the cavity 48 (step S6).
[0033]
After the above casting operation is completed and the casting pins 60a and 60b are retracted via the cylinders 64a and 64b constituting the driving mechanisms 62a and 62b (step S7), the process proceeds to step S8 to drive the cylinders 80a and 80b. Under the action, the second sliding dies 46a and 46b are retracted. Further, the pressing block bodies 70a and 70b are moved away from each other via the drive mechanisms 62a and 62b, and the guide rods 72a and 72b are engaged with the step portions of the stepped hole portions 76a and 76b, so that the first slide is made. The movable molds 44a and 44b move in directions away from each other. As a result, the first sliding dies 44a and 44b are retracted (step S9), and the upper die 42 is raised to perform the mold release process (step S10).
[0034]
In this case, in this embodiment, the advance / retreat operation of the core pins 60a, 60b and the advance / retreat operation of the first sliding dies 44a, 44b are performed via a single drive mechanism 62a, 62b, and at the time of clamping In order to constrain the first sliding molds 44a and 44b to predetermined positions, the first sliding members 44a and 44b and the second sliding mold 46b are engaged with the first locking members 84a and 84b and the second sliding molds 46b. Two locking members 86a and 86b are provided.
[0035]
Therefore, the second locking members 46a and 46b are moved forward via the cylinders 80a and 80b, and the second locking members 86a and 86b are moved to the first tapered surfaces 88a and 88b of the first locking members 84a and 84b. The two tapered surfaces 90a and 90b can be engaged with each other, and the first sliding dies 44a and 44b can be restrained to the clamping position.
[0036]
Thereby, an actuator for engaging and disengaging the first sliding dies 44a and 44b with respect to the core pins 60a and 60b and an actuator for restraining the first sliding dies 44a and 44b to a predetermined position at the time of clamping are provided. This eliminates the need to effectively simplify the entire configuration of the casting apparatus 20 and to reduce the manufacturing cost and provide an economical effect.
[0037]
In addition, the camshaft journal hole 32 can be cast using the core pins 60a and 60b facing each other, and the post-working workability is improved as compared with the prior art in which the camshaft journal hole 32 is drilled in a later process. There is an advantage that the efficiency of the whole manufacturing operation of the cylinder head can be easily achieved while greatly improving.
[0038]
In the drive mechanisms 62a and 62b, the forward end position, the intermediate position, and the backward position are used in order to perform the operation of moving only the core pins 60a and 60b and the operation of moving the first sliding dies 44a and 44b simultaneously. The cylinders 64a and 64b that can be controlled at the three positions are used, but the present invention is not limited to this. For example, a structure in which two cylinders are connected in series, a structure using a ball screw and a motor, etc. Various configurations can be employed.
[0039]
【The invention's effect】
In the cylinder head casting apparatus according to the present invention, the advancement / retraction operation of the casting pin and the advance / retreat operation of the first sliding die are performed by the same drive mechanism, and the first sliding die is placed in a predetermined position during mold clamping. In order to restrain, the 1st and 2nd locking members provided in the 1st sliding type and the 2nd sliding type are mutually engaged. For this reason, the number of actuators is greatly reduced, and the configuration is effectively simplified. As a result, the casting apparatus can be constructed economically, and a cylinder head having a camshaft journal hole can be obtained efficiently.
[Brief description of the drawings]
FIG. 1 is a schematic perspective explanatory view of a cylinder head casting apparatus according to an embodiment of the present invention.
FIG. 2 is a partial cross-sectional plan view of the casting apparatus.
FIG. 3 is a sectional view of the casting apparatus.
FIG. 4 is a partial cross-sectional view of the casting apparatus.
FIG. 5 is a cross-sectional explanatory view of a core pin constituting the casting apparatus.
FIG. 6 is a flowchart for explaining a casting operation by the casting apparatus.
FIG. 7 is a plan view when the first sliding mold constituting the casting apparatus is advanced.
FIG. 8 is a plan view when the cast pin is retracted in a state where the first and second sliding dies are clamped.
FIG. 9 is an explanatory cross-sectional view of a casting apparatus according to the prior art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 20 ... Casting apparatus 22 ... Cylinder head material 28a-28c, 30a, 30b ... Taper hole 32 ... Camshaft journal hole 42 ... Upper mold | type 44a, 44b, 46a, 46b ... Sliding mold | type 48 ... Cavity 50 ... Spout 52a-52d ... Projection 54 ... Hole 60a, 60b ... Casting pin 62a, 62b ... Drive mechanism 64a, 64b, 80a, 80b ... Cylinder 70a, 70b ... Pressing block 72a, 72b ... Guide rod 76a, 76b ... Stepped hole 84a 84b, 86a, 86b ... locking members 88a, 88b, 90a, 90b ... taper surfaces

Claims (1)

A cylinder head casting apparatus having a casting pin for casting a camshaft journal hole of a cylinder head,
The cylinder head casting apparatus comprises:
A pair of first sliding molds facing each other in the axial direction of the camshaft journal hole and capable of moving back and forth in the axial direction;
A pair of cast pins slidable in the axial direction with respect to the first sliding mold;
A guide rod slidable in the axial direction with respect to the first sliding mold;
A drive mechanism capable of moving the first pin and the guide rod back and forth in the axial direction and moving the first sliding die back and forth in the axial direction;
A pair of second sliding molds opposed to each other in the radial direction intersecting the axial direction and capable of moving back and forth in the radial direction;
First and second latches provided on the first sliding mold and at least one of the second sliding molds for engaging with each other at the time of clamping to restrain the first sliding mold at a predetermined position. And
Equipped with a,
The drive mechanism includes a cylinder and a pressing block body attached to the cylinder and to which the cast pin and the guide rod are fixed.
The first sliding mold is provided with a hole for slidingly fitting the core pin and a stepped hole for inserting the head of the guide rod,
As the cylinder advances, the pressing block body, the core pin, and the guide rod advance, and the pressing block body presses the first sliding mold in the axial direction, thereby the first sliding mold. Goes forward,
As the cylinder moves backward, the pressing block body, the core pin, and the guide rod move backward, and the head of the guide rod engages with the stepped portion of the stepped hole portion of the first sliding type. wherein by first sliding type is pulled, the casting apparatus of a cylinder head wherein the first sliding type characterized that you retract Te.

Images