JPH03169468A - Pressing-in apparatus for core - Google Patents

Abstract

PURPOSE:To automate core pressing-in work by pressing the sand core held by a core holder beforehand into a core fitting recessed part at the opposite side with ejecting movement of an ejector pin. CONSTITUTION:When a positioning cylinder 6 is extended a positioning block 15 is fitted to a projecting part 4 and relative positioning between a frame 1 and a casting die 2, is executed. When a guide cylinder 7 is extended the core holder 20 holding the sand core 56 beforehand is advanced and a part of a water jacket die 52 is pressed in. Furthermore, by extending a pressing-in cylinder 8, the ejector pin 13 ejects the sand core 56 in the core holder 20 and the sand core 56 is pressed into the core fitting recessed part with the prescribed pressure while being guided by a support plate and guide groove to execute the positioning.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an apparatus for press-fitting a sand core into a casting mold in a pressure casting method using a mold such as the pressure die casting method. Regarding.

Conventional technology As a method of casting a so-called semi-closed type cylinder block 50 having an upper deck, FIGS.
As shown in the figure, the upper deck 5 of the annular water jacket mold 52 in which the water jacket 51 is to be formed
A core fitting recess 54 is cut out in a portion corresponding to No. 3, and a predetermined space 55 which is to become an anopah deck 53 is left on the 7 ring head side of this core fitting recess 54. After the sand core 56 is fitted, casting is performed, and after casting, the sand core 56 is discharged and a cooling water passage 57 that becomes a part of the water jacket 51 is formed in this sand core portion. A method for doing so has been proposed (a similar structure is shown in, for example, Japanese Patent Laid-Open No. 59-232654).

58 is a bore mold.

Problems to be Solved by the Invention In such a casting method, in the example shown in FIG. 6, an operator sets two or three sand cores 56 per cylinder into the water jacket mold 52 each time!・The workability is extremely poor because it has to be done, and this remains a problem in promoting complete automation of casting work.

Furthermore, when setting the sand core 56 in the water jacket mold 52 as described above, it is difficult to simply position the sand core 56 because flash is likely to occur in the gap between the two due to contact between different materials. Therefore, it is necessary to press fit into the water jacket mold 52 with a predetermined pressure.

In this case, if the pressing force varies due to individual differences among workers who handle the sand core 56, the sand core 56 itself is fragile, which may cause damage to the sand core 56 or a decrease in positioning accuracy, which may impair the shape accuracy of the product. There is no hope for improvement or uniformity.

The present invention was made in view of the above problems.
The purpose of this is to be able to press in the sand core evenly with a constant pressing force without damaging the sand core on behalf of the operator, and to improve the positioning accuracy of the sand core and make it uniform. An object of the present invention is to provide a core press-fitting device that can improve the shape accuracy of products.

Means for Solving the Problems The core press-fitting device of the present invention includes a frame supported by a loading means such as a robot or an autoloader, and direct-acting first, second, and third actuators provided on the frame. is connected to the output rod of the first actuator and has a positioning member, and by the action of the first actuator, the positioning member is fitted into the positioning reference part on the casting mold side, and the frame and the casting mold are connected. It has a positioning plate that controls positioning, and a core holder that is connected parallel to the positioning plate to the output rod of the second actuator and holds the sand core, and the core holder is held by the function of the second actuator. It has a guide plate 1 for positioning in the core fitting recess, and an ejector pin connected parallel to the positioning plate to the output rod of the third actuator and corresponding to the core holder. an ejector plate that is inserted into the positioned core holder by the action of a third actuator and press-fits the sand core into the core fitting recess while pushing out the sand core from the core holder; It is equipped with

According to this structure, the positioning member supported by the positioning plate is fitted into the positioning reference part on the casting mold side by the action of the first actuator, thereby adjusting the position of the core fitting recess and the core holder. The frame and the casting mold are positioned relative to each other so that they match.

Subsequently, the core holder holding the sand core in advance is moved together with the guide plate by the action of the second actuator, and the core holder is positioned in the core fitting recess.

When the ejector pin is inserted into the core holder with the core holder positioned in the core fitting recess as described above, the sand core inside the core holder is pushed out and the core is fitted under a predetermined pressure. It is press-fitted into the mating recess.

Embodiment FIG. 1 is a structural explanatory diagram showing an embodiment of the present invention, in which 1 is a frame which is the center of a core press-in device, and 2 is a casting mold. As shown in FIG. 5, the casting mold 2 has a bore mold 58 and a water jacket mold 52 integrally formed with the mold body 3, and the bore mold 58 has a mating mold (not shown). A tapered hoon-shaped protrusion 4 is formed to serve as a positioning reference portion during mold matching.

Frame 1 has a bracket 5 attached to the end of the arm of a loading device such as a loading robot or an autoloader.
The frame 1 includes a pair of positioning cylinders 6 that are first actuators, a pair of guide cylinders 7 that are second actuators,
A press-fit cylinder 8, which is a third actuator, is provided.

9 is an ejector plate provided parallel to the frame 1, 10 is a positioning plate, and 1l is a guide plate. The ejector plate 9 is connected to the tip of the piston rod (output rod) 12 of the press-fit cylinder 8 and is equipped with a plurality of ejector pins l3. Slide.

The positioning plate 10 is connected to the tips of the piston rods (output rods) 14 of the pair of positioning cylinders 6, and the positioning plate 10 has a protrusion 4 on the side of the bore mold 58.
Positioning block 15 as a positioning member that fits with
is fixed.

Then, a guide hole 1 formed in the positioning plate 10
6 is the piston rod of guide cylinder 7 (output rod)
Since positioning block 17 is inserted, positioning block 15
is guided by the piston opening 17 by the action of the positioning/linter 6 together with the positioning plate IO.

Here, the positioning block 15 has a Gytron F section 18.
is integrally formed, and the guide hole 19 formed in the ejector plate 9 is inserted into the guide rod part 18, so that the guide rod part 15 has an i-socket that guides the ejector plate 9. do.

The guide plate hll is connected to the tip of the piston loft river 7 of the pair of guide cylinders 7, and a sand core 56 shown in FIG. A core holder 20 for holding the core is attached. These core holders 20 then slide together with the guide plate 9 due to the action of the press-fit cylinder 8.

As shown in FIG. 5, the core holders 20 are individually installed at positions corresponding to the core fitting recesses 54 into which the sand cores 56 are to be press-fitted into the water jacket mold 52. As shown in FIGS. 2 and 3, this core holder 20 is screwed to a guide plate l1 and fixed to a holder block 22 having a substantially V-shaped guide groove 2l, and to both sides of the holder block 22. Support plate 2
It is composed of 3 and 24. The sand core 5 shown in FIG. 5 is placed in the gap between the support plates 23 and 24.
6 is press-fitted in advance and held.

Next, the operation of the core press-fitting device constructed as described above will be explained based mainly on FIGS. 1 and 4. however,
FIG. 4 shows the upper half and lower half in different states.

First, as shown in FIG. 1, the frame 1 is moved to face the casting mold 2, which has been positioned and fixed in advance, by the movement of the loading means, and then the positioning cylinder 6 is moved to extend. When the positioning cylinder 6 extends, the positioning block 15 moves forward with the positioning plate 10 relative to the casting mold 2, and the positioning block 15 fits into the protrusion 4, so that the frame 1 and the casting mold 2 are positioned relative to each other. Ru. As a result, the sand core 56 held by the core holder 20 and the core fitting recess 54 on the casting mold 2 side (FIG. 5)
Matches the position.

Subsequently, when the guide cylinder 7 is extended under the above-mentioned positioning state, the core holder 20 holding the sand core 56 in advance moves into the water jacket as shown in the lower half of FIG. The support brake 23.24 of the core holder 20 moves forward with respect to the
A portion of the water jacket core 52 including the core fitting recess 54 shown in the figure is press-fitted.

If the press-fit cylinder 8 is further extended in this state,
As shown in the upper half of FIG. 4, the ejector pin 3 is inserted into the core holder 20 and
Push out 6. As a result, the sand core 56 is pressed into the core fitting recess 54 with a predetermined pressure and positioned while being guided by the support plates 23, 24 and the guide groove 2l.

Once the sand core 56 has been press-fitted in this way, the core holter 20 and the ejector pin 13 are moved back in this order, and the positioning block 15 is moved back, and the protrusion 4
By releasing the fitting, the press-fitting work of the sand core 56 is completed.

Here, the positioning accuracy of the sand core 56 can be improved by setting the dimension Q2 slightly larger than the dimension iR1 in the sand core 56 and the core fitting recess 54 shown in FIG. 5 to give a predetermined slope. This makes it more desirable in terms of

Effects of the Invention As described above, according to the present invention, the sand core held in advance by the core holder is press-fitted into the core fitting recess of the mating member 011I by the ejector pin pushing operation. There is no need for workers to be involved in core press-in work, and complete automation of core press-in work can be achieved.

In addition, the core holder holding the sand core is compressed and positioned in the casting mold in advance, and the sand core is guided into the core fitting recess by the ejector pin while the sand core is guided by this core holder. Since it is press-fitted, it is possible to prevent damage to the sand core by making the pressing force uniform, and it is also possible to improve and equalize the positioning accuracy of the core, which can greatly contribute to improving the shape accuracy of the product. .

[Brief explanation of the drawing]

Fig. 1 is a configuration explanatory diagram showing one embodiment of the present invention, Fig. 2 is an enlarged view of the main part of Fig. 1 seen from the right side, Fig. 3 is a perspective view of the core holder, and Fig. 4 is the first An explanatory diagram for explaining the operation of the device shown in the figure, Figure 5 is an enlarged perspective view of the main parts of the casting mold, and Figure 6 is an enlarged view of the main parts of the cylinder block manufactured using the casting mold shown in Figure 5. The perspective view and FIG. 7 are cross-sectional views taken along line 1-1 in FIG. 6. l... Frame, 2... Casting mold, 4... Projection as a positioning reference part, 6... Positioning cylinder as a first actuator, 7... Guide as a second actuator Cylinder, 8... Press-fit cylinder as third actuator, 9... Ejector plate, 10... Positioning plate, 11... Guide pull l/-t-, 12, 14.17... Output Piston rod as rod, 13... Ejector pin, l
5... Positioning block as a positioning member, 20
... Core holder, 52 ... Water jacket mold, 5← ... Core fitting recess, 56 ... Sand core, 58 ...
・Bore mold. Figure 2 70 Figure 6

Claims (1)

[Claims] (1) In an apparatus for press-fitting a sand core into a core fitting recess formed in advance in a casting mold, a frame supported by a loading means, first and second direct-acting molds provided on the frame, A third actuator is connected to the output rod of the first actuator and has a positioning member, and the function of the first actuator causes the positioning member to fit into the positioning reference part on the casting mold side, and is connected to the frame. The second actuator has a positioning plate that controls positioning with the casting mold, and a core holder that is connected parallel to the positioning plate to the output rod of the second actuator and holds the sand core. a guide plate for positioning the core holder in the core fitting recess; and an ejector pin connected parallel to the positioning plate to the output rod of the third actuator and corresponding to the core holder; The sand core is inserted into the core holder positioned in the matching recess by the action of the third actuator, and the sand core is press-fitted into the core fitting recess while pushing out the sand core from the core holder. A core press-fitting device comprising: an ejector plate;