JPH0227963Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to an ejector pin attachment device in a die-casting machine.

(Prior Art and Problems) The applicant of this invention previously proposed a die-casting machine in which the mold is clamped from three directions in Japanese Patent Laid-Open No. 77763/1983. This die casting machine consists of first and second molds attached to first and second movable plates that move in the left-right direction, and a core or third mold attached to a third movable plate that moves in the front-rear direction. Therefore, the mold is clamped within the surrounding frame, and when the mold is opened, the core is opened last, and the shoulder of the product attached to it is engaged with the annular plate attached to the surrounding frame, so that the product can be pulled out. It is designed to be taken out. However, with this extraction method, the shape of the molded product is limited to a hollow one, and it is difficult to obtain products with other shapes. Furthermore, even if the product is hollow, it is difficult to obtain a product with a complex hollow internal shape using the above-mentioned extraction method in which the core is opened last.

By providing an extrusion pin on at least one of the first and second movable plates and selecting whether to attach the product to the extrusion pin and take it out, or to attach the product to the core and take it out as described above, It becomes possible to obtain products of various shapes.

However, in this case, it is troublesome to install and remove the ejector pin, and the time loss required for the installation and removal is large, especially for users who replace the mold in a relatively short period of time.

This invention was made based on the above-mentioned technical background, and an object of the present invention is to provide an ejector pin mounting device that can easily attach and detach an ejector pin in a short time.

(Means for solving the problem) This invention for achieving the above object provides a movable plate with a recess that opens at the front end in the mold clamping direction,
A connecting chamber for the ejecting pin is formed in the front part of the recess, and a cylinder chamber is formed in the rear part, and the piston rod of the piston accommodated in this cylinder chamber is made to protrude into the connecting chamber. The mounting plate is fixed and accommodates a seat plate having a recess formed in the other end surface into which the tip of the piston rod fits, and a through hole is formed in the seat plate to cross the fitting recess, and a through hole is formed in the piston rod. A through-hole is formed in the movable plate to align with the through-hole in the seat plate, and an insertion hole is formed in the movable plate to align with the through-hole in the seat plate, and a cotter pin is removably inserted into each of the through-holes in the seat plate and the piston rod through this insertion hole. It is characterized by being like this.

(Function) When using the ejector pin, its mounting plate is fixed to the seat plate, and the seat plate is accommodated in the connection chamber and fitted to the piston rod. Then, insert the pusher pin into each through hole of the seat plate and piston rod from the insertion opening of the movable plate, thereby integrally connecting the piston rod and the seat plate, and the ejector pin reciprocates by the operation of the cylinder. .

If the push-out pin is not used, just pull out the push-out pin from the insertion opening of the movable plate and remove the seat plate.

(Example) This invention will be explained below with reference to the illustrated example.

Figures 1 and 2 show a die-casting machine 1 that clamps the die from three directions. A holding plate 3 is vertically fixed to a pot 2 containing molten metal, and one side of this holding plate 3 is The gooseneck mechanism 4 is mounted with its lower part immersed in the pot 2, and the gooseneck mechanism 4 is supported such that the upper part of the main body 5 is slidable within a housing 6 provided on the retaining plate 3, and the gooseneck mechanism 4 is The lower part of the main body 5 is fixed to one end of a piston rod 8 of a hydraulic cylinder 7 provided on the holding plate 3. A substrate 9 is provided at the other end of the holding plate 3 in a substantially horizontal orientation.

On the substrate 9, at a position near the holding plate 3 and opposite to the gooseneck mechanism 4 sandwiching the holding plate 3,
A surrounding frame 10, which is a mold clamping part, is provided. Surrounding frame 1
0 includes two sets of guide rods 11a, 11b extending leftward from the left frame 10a and consisting of two upper and lower guide rods, and the right frame 10.
Two sets of guide rods 11a and 11c each consisting of two upper and lower guide rods extend to the right from b, and two upper and lower guide rods 11d extend forward from the front frame 10c. Guide rods 11 for left and right frames 10a and 10b
Among a, 11b, 11c, gooseneck mechanism 4
A pair of guide rods 11a located on the opposite side of the frame 1
It is composed of one guide rod that passes through the hole. In addition, the guide rods 11a, 11b, 11c, 11
d is supported by support plates 12 and 13 at its intermediate portion and tip portion, respectively.

The guide rods 11a and 11b extending to the left, the guide rods 11a and 11c extending to the right, and the guide rod 11d extending forward include first and second molds to which molds are mounted between the surrounding frame 10 and the support plate 12. 2. 3rd
Movable plates 14a, 14b, and 14c are each slidably attached. These first, second and third movable plates 14a, 14b, 14c
The link mechanism 17a is connected to the rods 16a, 16b, 16c of the hydraulic cylinders 15a, 15b, 15c.
17b and 17c, and the surrounding frame 1
0 and the support plate 12.

The surrounding frame 10 has rectangular openings 18 and 19 in the left and right frames 10a and 10b, circular openings 20 and 21 in the front and rear frames 10c and 10d, and rectangular openings 22 and 23 in the upper and lower frames 10e and 10f (see FIG. 6). The openings 18 to 23 communicate within the surrounding frame 10 to form a void.

3 to 5 show details of the first movable plate 14a. The first movable plate 14a includes a main body 24 fitted to the guide rods 11a and 11b, and a protrusion 25 integrally formed at the front end of the main body 24 in the mold clamping direction. 26
A recess 27 having a rectangular cross section is formed in the protrusion 25 and opens at the front end surface in the mold clamping direction, that is, the mounting surface of the first mold 38a and communicates with the recess 26. A sleeve 28 is fitted into the recess 26 and a cylinder cover 29 is screwed onto the recess 26, thereby defining a cylinder chamber 30 in the recess 26. Further, the recess 27 defines a connection chamber for the extrusion pin 37.

A piston 32 is slidably housed in the cylinder chamber 30, and the piston rod 31 is connected to the connecting chamber 27.
A mounting plate 35 of an ejector pin 37 is connected to the piston rod 31 via a seat plate 33 and a knock pin 34. That is, a mounting plate 35 is fixed to one end face of the seat plate 33 by a screw 36 (FIG. 4), and a recess 60 is formed in the other end face, into which the tip of the piston rod 31 fits. ing.

The seat plate 33 has a through hole 61 that crosses the fitting recess 60.
is formed, and a through hole 61 is formed in the piston rod 31.
A through hole 62 is formed which is aligned with. Furthermore, an insertion hole 63 is formed in the upper part of the protrusion 25 and is aligned with the through hole 61, and the cotter pin 34 is removably inserted into the through holes 61 and 62 through this insertion hole 63. The piston rod 31 and the seat plate 33 are integrally connected by the piston pin 34.

To install the extrusion pin 37, tighten the mold 38a with the screw 39.
After the seat plate 33 to which the mounting plate 35 of the extrusion pin 37 is fixed is accommodated in the connection chamber 27 and fitted to the piston rod 31, the extrusion pin 37 is inserted into the through holes 61 and 62. The cotter pin 34 is inserted.

The bolt pin 34 can be removed by, for example, providing a screw hole at the top of the bolt pin 34, screwing a pull-out bolt into the screw hole, and pulling it out. Alternatively, a push-up bar may be inserted into the lower hole 63' provided in the protruding portion 25 to push the push-up pin 34 up.

The first mold 38a is attached to the protrusion 25 via a screw 39, and the cavity 4 of this first mold 38a
An extrusion pin 37 is slidably fitted into a hole 41 bored between the end face of the extrusion pin 37 and the end face on the opposite side thereof. The tip of the extrusion pin 37 protrudes from the cavity 40 when the piston 32 is operated, and the extrusion pin 37 protrudes from the cavity 40 when the piston 32 is operated in reverse.
It is designed to match the base of 0.

The configuration of the second movable plate 14b is similar to that of the first movable plate 14b described above.
The structure is similar to that of the movable plate 14a, and a second mold 38b is attached to the second movable plate 14b (see FIGS. 7, 8, and 9).

A third movable plate 14c is shown in FIG. 6, and a seat plate 42 to which a third mold 38c is attached is fixed to the third movable plate 14c via screws 43. The bottom of the third mold 38c is accommodated in a recess 44 provided in the seat plate 42, and a ring 45 is fitted into the third mold 38c.
It is attached to the seat plate 42 by being fixed via 6.

In the opening 20 provided in the front frame 10c of the surrounding frame 10,
An annular plate 48 having a through hole 47 formed in the center thereof through which the third mold 38c can pass is fitted, and the annular plate 48 is fixed to the surrounding frame 10 via screws 49. An annular substrate 49 is fixed to the opening 21 provided in the rear frame 10d, and the gooseneck mechanism 4 is attached to the annular substrate 49.
A recess 51 into which the nozzle portion 50 enters is formed, and an intermediate plate 53 in which a molten metal spout 52 is bored is fixed to the bottom of the recess 51. The nozzle portion 50 of the gooseneck mechanism 4 is capable of entering and exiting through an opening 54 provided in the holding plate 3. When pouring molten metal, the nozzle portion 50 contacts the middle plate 53 and communicates with the injection port 52. They are becoming more distant. 56
is an opening through which the product 55 is dropped.

Next, the operation of the above device will be explained.

(B) When molding a solid product (Fig. 7) An extrusion pin 37 is attached to the first and second movable plates 14a, 14b, and molds 38a, 38 are formed with a cavity 40 of a predetermined shape.
b is mounted, the hydraulic cylinders 15a and 15b are operated, and the molds 38a and 38b are advanced into the surrounding frame through the openings 18 and 19 of the surrounding frame 10 and the molds are clamped.

After clamping the mold, the hydraulic cylinder 7 (shown in the first diagram) is operated to communicate the nozzle portion 50 of the gooseneck mechanism 4 with the injection port 52 of the intermediate plate 53, and in this state, molten metal is poured into the cavity 40 to form the product 55. .

Thereafter, the hydraulic cylinder 7 is operated in reverse to separate the nozzle portion 50 from the middle plate 53, and the hydraulic cylinders 15a and 15b are operated in reverse to open the molds 38a and 38b. Piston 3 assembled into movable plates 14a, 14b after mold opening
2, the extrusion pin 37 is inserted into the molds 38a and 3.
When the product 55 is ejected from the mold 8b, the product 55 attached to the cavity 40 of one of the molds 38a is pushed out by the extrusion pin 37 and separated from the cavity 40. At this time, the product 55 is attached to the ejector pin 37, and when the piston 32 is reversely operated to retract the ejector pin 37, the product 55 comes into contact with the cavity 40 and separates from the ejector pin 37.
Then, when the push-out pin 37 is again projected and retracted, the product 55 passes through the opening 56 of the substrate 9 and falls to a predetermined location.

As mentioned above, in this example, the first and second molds 38
Only molds a and 38b are used, and the third mold 38c is not used. 1st and 2nd depending on the molten metal casting path.
For example, the first mold 3 is placed on one of the molds 38a and 38b.
If the product 55 is inevitably attached to the movable plate 8a, the push-out pin 37 may be incorporated only in the first movable plate 14a.

(b) When molding a hollow product (Figures 6 and 8) The extrusion pin 37 is not attached to the first and second movable plates 14a and 14b, and the molds 38a and 38b are
the third movable plate 14c.
Mount the mold 38c. The hydraulic cylinder 15c is operated first, then the hydraulic cylinders 15a and 15b are operated, and the third mold 38c is operated, and then the first and second molds are operated.
The molds 38a and 38b are advanced into the surrounding frame 10 in this order and are clamped.

After the mold is clamped, molten metal is poured into the cavity 40 as described in (a) above to form the product 55. After that, the hydraulic cylinders 15a and 15b are operated first, then the hydraulic cylinder 15c is reversely operated, and the first and second molds 38a and 38b are then activated.
The molds are opened in the order of mold 38c. Third mold 38
A product 55 is attached to c, but when the third mold 38c passes through the through hole 47 of the annular plate 48, the product 55 engages with the periphery of the through hole 47 and separates from the third mold 38c. and will fall.

(C) When molding a hollow product by opening the third mold 38c first (Fig. 9) Even if the product is hollow, depending on the shape of the hollow interior, the third mold 38c may be opened first. There are cases where the product cannot be obtained unless the mold is opened. For example, the cavity 4 of the first or second mold 14a, 14b
0, and a third mold 38c is formed on this projection.
In this case, the third mold 38c must be opened first, and therefore, in the method described in (b) above, it is not possible to remove the product 55. Can not.

In such a case, the first and second movable plates 1
The extrusion pins 37 are attached to the molds 4a and 14b, and the hydraulic cylinders 15a and 15b are operated first, and then the hydraulic cylinder 15c is operated to release the first and second molds 3.
The molds 8a, 38b and then the third mold 38c are clamped in this order.

After the mold is clamped, molten metal is poured into the cavity as described in (a) above to form the product 55. After that, the hydraulic cylinder 15c is operated first, then the hydraulic cylinders 15a and 15b are reversely operated, and the third mold 38c is then operated first and second molds 38a and 38b.
Open the mold in this order. After the mold is opened, if the forward and reverse operations of the piston 32 are repeated twice as described in (a) above, the product 55 will fall. In this case, the push-out pin 37 is connected to the first and second movable plates 14.
It may be incorporated only in one of a and 14b.

According to this method, the product obtained by the method described in (b) above can of course also be obtained by molding, but in the case of method (b) above, there is no separation of the product. It is reliable, and there are no marks from the extrusion pins on the circumferential surface of the product, resulting in a high-quality product.

(Effects of the invention) As described above, according to this invention, the ejector pin can be attached to and removed from the movable plate by the simple operation of inserting the kotta pin into a predetermined hole or pulling it out. can be done efficiently in a short time.

[Brief explanation of drawings]

Fig. 1 is a plan view showing the entire die-casting machine to which this invention is applied, Fig. 2 is a right side view of the same as above, and Fig. 3 is a plan view showing an embodiment of this invention.
Figure 4 is a sectional view taken along the line - in Figure 3;
Figure 5 is a sectional view taken along the line - in Figure 3;
Fig. 6 is a side sectional view showing an example of the mold clamping state;
The figure is a sectional plan view when a solid product is molded, and FIGS. 8 and 9 are plan sectional views when a hollow product is molded. 1... Die casting machine, 4... Gooseneck mechanism, 14a to 14c... First to third movable plates, 15a to 15c... Hydraulic cylinder, 26...
Recess, 27... Recess (connection chamber), 30... Cylinder chamber, 31... Piston rod, 32... Piston, 33... Seat plate, 34... Knock pin, 35...
...Mounting plate, 37...Extrusion pin, 60...Recess, 6
1, 62...through hole, 63...insertion port.

Claims (1)

[Scope of utility model registration request] The movable plate 14a is provided with recesses 26 and 27 that open at the front end in the mold clamping direction, and a connecting chamber 27 for the push-out pin 37 is defined in the front part of the recess, and a cylinder chamber 30 is defined in the rear part of the recess. The piston rod 31 of the piston 32 housed in the connecting chamber 2
7, a recess 60 into which the mounting plate 35 of the push-out pin 37 is fixed on one end face of the connecting chamber 27 and into which the tip of the piston rod 31 fits on the other end face.
The seat plate 33 is provided with a through hole 61 that crosses the fitting recess 60, and the piston rod 31 is provided with a through hole 62 that is aligned with the through hole 61. 14
Insertion port 63 aligned with through hole 61 of seat plate 33 at a
A push-out pin in a die-casting machine is characterized in that the push-out pin 34 is removably inserted into each through-hole 61, 63 of the seat plate 33 and piston rod 31 through the insertion opening 63. Mounting device.