JPS644861B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a core clamping device that is incorporated into a device for transferring a core for casting a cylinder block of an automobile engine from a core assembly jig to a mold, for example. .

Since the size of the core varies depending on the size of the cylinder block, it is necessary that the core clamping device be able to clamp cores of various sizes. For this reason, the core clamp device is provided with a stopper mechanism that restricts the range of expansion and contraction of the clamp mechanism. For example, in the case of a clamp device used in an apparatus for casting cores of four different sizes, the conventional stopper mechanism fixes four stopper members of different lengths to a support member, and also fixes the support member to a support member. The clamp mechanism is supported so as to be able to reciprocate in a direction perpendicular to the direction in which the clamp mechanism expands and contracts, and one of the stopper members is brought into contact with a protrusion of the clamp mechanism. In other words, during the closing operation, the clamping mechanism stops by bringing the protrusion into contact with one of the stopper members, and clamps the core in this state, and the type of stopper member is selected in advance according to the size of the core. ing.

However, there is a certain limit to the stopping position accuracy of the stopper member switching mechanism, that is, the drive mechanism for the support member, and each stopper member does not always stop at the same position. Therefore, even if one stopper member is adjusted to stop at a predetermined position, other stopper members do not necessarily stop at the predetermined position, and for this reason, the contact position of the protrusion of the clamp mechanism with the stopper member is adjusted to the stopper member. It varies from member to member, making it impossible to clamp the core accurately.
This makes it impossible to place the core into the mold with high accuracy, which in turn leads to a decrease in the casting dimensional accuracy of the casting. Therefore, in the conventional clamp device having the above structure, it is necessary to incorporate a special fine adjustment mechanism into the stopper mechanism.

In view of the above points, the present invention enables high-precision clamping without providing a special fine-adjustment mechanism in the stopper mechanism, and makes it possible to always accurately house several types of cores in a mold. This was done for the purpose of obtaining a core clamping device.

The stopper mechanism of the core clamping device of the present invention includes:
A rotatably supported arm, a plurality of stopper members fixed to the rotating end of the arm and having different rotation radii, and a drive mechanism for rotating the arm, and a clamp mechanism for each stopper member. The contact surface is characterized by being an arcuate surface centered on the rotation center of the arm.

The present invention will be explained below with reference to illustrated embodiments. 1st
The figure shows a core clamping device 1 which is an embodiment of the present invention.
The external view of the core storage device is shown. This clamp device 1 is attached to the lower surface of a truck 2, and the truck 2 can be raised and lowered by a lifter 3 and can be reciprocated horizontally by a cylinder device 4. A core assembly jig 5 is provided below one end of the movement range of the clamp device 1, and a mold 6 is provided below the other end.

As shown in FIG. 2, first and second cylinders 101 and 102 are arranged at both ends of the lower surface of the machine frame 100 of the core clamping device 1, respectively, and each piston rod 103 of these cylinder devices 101 and 102 , 104, first and second mounting members 105, 106 are fixed. These mounting members 105 and 106 are supported by guide rods 107 and 108 provided on the lower surface of the machine frame 100.
It reciprocates along these rods 107 and 108. The claws 109 and 110 attached to the lower parts of the mounting members 105 and 106 respectively engage with locking holes (not shown) formed in the core A to clamp the core A. Of the two claws attached to the mounting member 105, one of the claws 109 has a protruding lower end to prevent the core A from falling, but the other claw 109' does not have this protrusion and is simply attached to the core A. Just lock it. However, the core A was clamped.
is lifted via the lifter 3, and the cylinder device 4
The material is transferred horizontally and stored in the mold 6. Further, the contact member 111 attached to the upper part of the first mounting member 105 comes into contact with a stopper mechanism described below to regulate the stopping position of the claw 109, and this stopping position becomes the clamping reference position of the core A. .
Therefore, the cylinder devices 101 and 102, the piston rods 103 and 104, and the mounting members 105 and 1
06, guide rods 107, 108, claws 109, 1
10 and the contact member 111 constitute a clamp mechanism.

A rotating shaft 112 is attached to the center part 12 of the machine frame 100 so as to face vertically downward.
An arm 113 is rotatably supported in a horizontal plane at the lower end of the arm 113 . As shown in FIG. 3, the tip of the arm 113 has an uneven surface, and four stopper members 114, 115, 116, and 117 are fixed to the end surface thereof. These stopper members 114, 11
5, 116, and 117 all have substantially the same shape, as shown in detail in FIG.
In addition, these stopper members 114, 115, 11
The turning radius of 6,117 is R _A , R _B , R _C , respectively.
R _D , and these depend on the size of the device core. The rotation shaft 112, arm 113, and stopper members 114, 115, 116, and 117 constitute a stopper mechanism.

The arm 113 is rotated by a drive mechanism described later and fixed at a predetermined position. FIG. 5 shows a state in which the abutting member 111 and the stopper member 117 of the clamp mechanism are in contact with each other. As can be understood from this figure, the end surface shape of the stopper member 117 is an arcuate surface centered on the rotation center C of the arm 113, so the stopper member 117 is inclined with respect to the center line B of the abutment member 111. Even if the center of rotation C
The distance from to the contact portion D of the stopper member 117 is always equal to the radius of rotation of the end surface of the stopper member 117.
Equal to R _D. Therefore, if the inclination angle of the stopper member 117 is within a certain range, the stop position of the abutment member 111, that is, the stop position of the claw 109, is as follows.
It is always the same, and core A can be clamped in the same state. This applies to all stopper members 114, 115, 116, 117. That is, these stopper members 114,
It is not necessary to set the positions of 115 and 116117 with high precision, and the claw 109 attached to the first attachment member 105 can always be stopped at a desired reference position.

As shown in FIG. 3, in this embodiment, there are two sets of clamp mechanisms and two sets of stopper mechanisms.
That is, two cores A are clamped and transported at a time. Thus, the arm 113 of the stopper mechanism is connected by a connecting rod 118, and is adapted to be rotated at the same time.
That is, the drive mechanism for rotating the arm 113 includes a connecting rod 118, a driving rod 119 supported at the end of the machine frame 100 so as to be movable forward and backward, and a link arm 120 connecting these rods 118 and 119. . Connecting rod 118 is pin 1
21 to the arm 113, so that when the drive rod 119 is moved in the axial direction, the connecting rod 1 is connected to the link arm 120 via the link arm 120.
18 moves, and the arm 113 is rotationally displaced.

Lever 122 attached to drive rod 119
can be engaged with four grooves of a guide 123 fixed to the machine frame 100, and the amount of displacement of the drive rod 119 changes depending on the grooves engaged, and the rotation angle of the arm 113 changes. A sensor 124 provided near the drive rod 119 detects the position of the rod 119 by engaging with a protrusion 125 formed on the rod 119. That is, sensor 12
4 has four detecting parts, and detects which of these detecting parts the protruding part 125 engages with, thereby detecting the position of the drive rod 119.

A positioning pin 127 fixed to the machine frame 100 via a mounting bracket 126 is used to control the position of the core A when the core A is taken out from the core assembly jig 5 and when the core A is stored in the mold 6. It regulates the relative position of the core assembly jig 5 and the mold 6.

A shim 128 is provided between the contact member 111 and the first mounting member 105, and a shim 129 is provided between the arm 113 and each stopper member 114, 115, 116, 117, respectively, as necessary for fine adjustment. is inserted.

Since the apparatus of this embodiment has the above configuration, it operates as follows. First, depending on the size of the device core A, the lever 122 is engaged with one of the grooves of the guide 123. As a result, the drive rod 119 is displaced in the axial direction, and the arm 113 is rotationally displaced via the link arm 120 and the connecting rod 118.
That is, the stopper members 114, 115, 11
6,117, one corresponding to the core A is selected. In the illustrated example, the stopper member 115 with the largest protrusion amount is selected and faces the abutment member 111 of the clamp mechanism. At this time, the protruding portion 125 engages with the detection portion of the sensor 124, and the stopper member 1
Completion of selection of item 15 is confirmed. Then, lifter 3
The carriage 2 is lowered through the core clamping device 1, and the core clamping device 1 is lowered onto the core assembly jig 5.

However, compressed air or the like causes the first cylinder 10 to
1 is driven, the first mounting member 105 moves forward via the piston rod 103, and the contact member 111 contacts the stopper member 115 of the stopper mechanism. As a result, the first mounting member 105 stops and the claw 1
09 and 109' lightly touch core A. At this time, it is confirmed that the first mounting member 105 presses a switch (not shown) and has stopped at a predetermined position.
Then, the second cylinder 102 is driven by compressed air or the like, and the pawl 110 of the second mounting member 106 moves forward via the piston rod 104, and this pawl 110 comes into contact with the core A. However, the second cylinder 102
In order to firmly clamp the core A, the pawl 110 is attached to the piston rod 10 together with the pawls 109 and 109'.
Make 4 stand out.

When the core A is clamped by the claws 109, 109', and 110, the lifter 3 lifts the core A by pulling up the cart 2. Then, the carriage 2 is driven to the left in FIG. 1 by the cylinder device 4, and the core A is transferred directly above the mold 6. Next, the core A is lowered by the lifter 3 and transferred into the mold 6. After the claws 109, 109', 110 are released,
The core clamp device 1 is raised, and the transfer operation of the core A is completed.

FIG. 6 shows another embodiment of the stopper mechanism. In this embodiment, the arm 130 has a substantially fan shape, and its outer peripheral end surface 131 is formed into a circular arc surface centered on the rotation center C, and four stopper members 132, 133, 134, 1 are provided on this end surface 131.
35 is fixed. These stopper members 13
2, 133, 134, and 135 have different lengths, and each end face is a circular arc surface centered on the rotation center C. Therefore, these stopper members 132, 133, 134, 135 also have claws 109,
109' can always be stopped at a desired position. Further, since the outer peripheral end surface 131 of the arm 130 is a circular arc surface, the stopper members 132, 133, 1
These stopper members 132, 133, 13 do not have to determine the fixing positions of 34, 135 with high precision.
There is an advantage that the center of the circular arc surface shape of the end face of No. 4,135 reliably coincides with the rotation center C. Therefore, according to this second embodiment, the first
The claws 109, 10 of the clamping mechanism
9' positioning accuracy is improved.

Further, even when using any of the stopper mechanisms described above, it is possible to automate the switching operation of the stopper mechanism. For example, the lever 12
2, a cell lock cylinder may be used.
That is, the piston rod of this cell lock cylinder may be connected to the drive rod 119, and the stroke amount of the piston rod may be adjusted in accordance with the stopper member used. In this case, the cell lock cylinder is controlled by an electric control panel, and this control panel operates upon receiving a type signal of the next set core from the core assembly jig 5, mold 6, etc. Other structural functions are the same as those of the first embodiment.

In each of the embodiments described above, the clamp reference position of the core changes depending on the contact relationship between the contact member 111 and each stopper member, but since the end surface of each stopper member is an arcuate surface,
There is no need to adjust the 30 stop positions with high precision,
It is only necessary to insert appropriate shims 128, 129. Therefore, fine adjustment of the clamp reference position of the core becomes easy, and the conventional device can adjust the clamping reference position by ±0.2mm.
It took an experienced person more than an hour to fine-tune the accuracy to within ±0.1mm, whereas with each of the above embodiments, the accuracy was within ±0.1mm.
It took about 10 minutes to fine-tune the accuracy to within the range.

As described above, according to the present invention, the clamp reference position of the core can be accurately determined without requiring a special fine adjustment mechanism, and the core can be accurately housed in the mold. This effect can be obtained.

[Brief explanation of the drawing]

1 is a side view showing a core storing device to which the device of the first embodiment of the present invention is applied, FIG. 2 is a side view of the device of the first embodiment, FIG. 3 is a plan view of FIG. 2, and FIG. This figure is a plan view of the stopper mechanism, FIG. 5 is an enlarged view showing the state of contact between the stopper member and the contact member, and FIG. 6 is a plan view showing another embodiment of the stopper mechanism. 113,130...Arm, 114,115,
116, 117, 132, 133, 134, 13
5... Stopper member, A... Core, C... Arm rotation center.

Claims (1)

[Claims] 1. A stopper mechanism having a stopper member that can interfere with at least one of the clamp mechanisms is provided between a pair of clamp mechanisms that can be expanded and contracted to clamp the core, and the stopper member can be adjusted according to the size of the core. In the core clamp device, the stopper mechanism includes an arm that is rotatably supported, and a stopper mechanism that is fixed to the rotating end of the arm and that has a rotation radius. A plurality of stopper members having different angles and a drive mechanism for rotating the arm are provided, and a contact surface of each stopper member with the clamp mechanism is located on an arc surface centered on the rotation center of the arm. Core clamping device.