JPH03210956A - Device for clamping pushing-out plate - Google Patents

Abstract

PURPOSE:To make sure of work and to simplify maintenance and inspection by constituting a pushing-out plate clamping device for pushing out a product from cavity with a magnetic chuck device. CONSTITUTION:In a device for pushing out the product from cavity 12a in a shifting mold 12 by advancing/retreating pushing pins 16 with advance/retreat of a movable part 20, the magnetic chuck device 46 on the face facing to a pressing plate 40 in the pushing-out plate 42 and a magnetic body attracting plate 40a on the face of pressing plate 40 facing to this, are arranged. Further, the magnetic chuck device 46 is constituted by mutually parallelly setting the plural permanent magnet blocks 52 and plural non-magnetic blocks 50 in a magnetic case 48 as slidable with bolts 59 and by covering a magnetic covering body mutually parallelly set with the plural magnetic band parts 56 and plural non-magnetic band parts 54 on the above blocks, so that exciting and release can be executed by shifting the case 48. By this method, the work of pushing-out clamp is surely executed and the maintenance and inspection work can be simply and easily executed.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to an ejector pin press plate provided in a mounting space between a movable die plate and a movable mold in a mold clamping device of a die casting machine or an injection molding machine. The present invention relates to a clamping device for clamping the extrusion plate and the extrusion plate.

[Conventional technology]

Generally, a mold device is equipped with an ejector pin device for ejecting a cast/molded product from the mold. That is,
In FIG. 5, the movable mold 12, including the press plate 18 that holds the plurality of ejection pins 16 that penetrate the mold and reach the inside of the cavity 12a, is removed to the movable die plate 10 when replacing the mold, Ready to be installed.

The extrusion plate 24 penetrates the movable die plate 10 and has one end fixed to one end of a plurality of extrusion rods 22 connected to the movable part 20 of an extrusion cylinder (not shown). When attaching the movable die 12 to the movable die plate 10, the extrusion pin pressing plate 18 is attached to the extrusion plate 2.
4 and are coupled by a clamp device described below, whereby the push-out pin 16 is moved forward and backward through the forward and backward movement of the movable portion 20, and the product (not shown) in the cavity 12a is pushed out. It is configured to

Next, as shown in FIG.
is a sliding plate 28 slidably attached to the extrusion plate 24.
They are configured to be coupled or released by being engaged with and disengaged from the gourd-shaped hole portion 30 of. That is, the connecting pin 26 connects the penetrating protrusion of the extrusion plate 24 to the small diameter neck portion 2.
6a and a stepped head portion 26b. On the other hand, the sliding plate 28 is connected to the hydraulic cylinder 3 attached to the extrusion plate 24.
2 between two positions separated by a predetermined distance S (FIG. 6). Further, the gourd-shaped hole 30 is formed as a large diameter hole 30b through which the stepped head 26b is inserted at one position of the sliding plate 28, and into which the small diameter neck 26a is engaged at the other position. It is formed in a small diameter hole 30a. Therefore, by sliding the sliding plate 28 with the hydraulic cylinder 32, the pressing plate 18 and the pushing plate 24 are coupled or released.

[Problem to be solved by the invention]

Thus, this type of conventional clamp device is configured to be driven by a hydraulic cylinder.

However, in such a configuration, since the hydraulic cylinder is installed inside the extrusion plate attached to the movable die plate, the hydraulic piping of the hydraulic cylinder must be configured as a movable piping such as a hydraulic hose. At the same time, there is a fundamental constraint that the piping work and maintenance must be performed within a narrow space.

For this reason, oil leaks often occur due to damage to the hydraulic piping, and maintenance and inspection of the entire hydraulic cylinder device is extremely difficult and complicated.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a push-out plate clamping device for clamping an push-out pin press plate and its push-out plate, which is reliable in operation, easy to maintain, and has a relatively simple configuration. be.

[Means to solve the problem]

In order to achieve the above object, the clamping device of the mold clamping device according to the present invention clamps the extrusion pin press plate provided in the attachment space between the moving die plate and the movable mold and the extrusion plate. In the extrusion plate clamp device, a magnetic chuck device that can be excited and released is embedded in a facing surface of the extrusion plate facing the pressing plate, and at least the facing surface of the pressing plate facing the magnetic chuck device is made of a magnetic material. It is characterized by

In this case, the magnetic chuck device includes a magnetic case with a top opening that is slidably embedded in an extruded plate, and a plurality of permanent magnet blocks that are sequentially arranged in parallel within this case with non-magnetic blocks interposed therebetween. , a magnetic lid covering the opening of the case and having a plurality of non-magnetic strips and magnetic strips arranged on the surface thereof corresponding to the non-magnetic blocks and the permanent magnet blocks; It can be composed of a moving means for moving the case.

The magnetic chuck device also includes an electromagnetic core buried in an extruded plate with its upper surface open, a plurality of electromagnetic coils buried in parallel in sequence with a predetermined distance apart from each other in this electromagnetic core, and an electromagnetic core with an open upper surface. Consisting of a magnetic lid covering an upper surface and having a plurality of non-magnetic strips arranged on the surface corresponding to the electromagnetic coils, and excitation current supply means for exciting or releasing the electromagnetic coils. You can also do it.

Further, a proximity switch for detecting contact connection between the extrusion plate and the pressing plate is provided at the attachment portion of the extrusion rod that drives the extrusion plate to the extrusion plate, and a lead wire of this proximity switch is guided through the inside of the extrusion rod. It is preferable to configure it so that it can communicate.

[Effect]

The clamping device consists of a magnetic chuck device provided within the extrusion plate. That is, the hydraulic cylinder and the movable hydraulic piping for the hydraulic cylinder in the conventional clamping device of this type are not required, and therefore, oil leakage and complicated maintenance and inspection work can be avoided, and at the same time, the structure thereof can be simplified.

〔Example〕

Next, an embodiment of the extrusion plate clamping device according to the present invention will be described in detail below with reference to the accompanying drawings. For convenience of explanation, the same reference numerals are given to the same components as in the conventional structure shown in FIGS. 5 and 6, and detailed explanation thereof will be omitted.

In FIG. 1, first of all, the ejector pin device to which the clamp device of the present invention is mounted is basically the same as the conventional structure shown in FIGS. 5 and 6. That is, the extrusion pin device is provided in the attachment space 14 between the movable die plate 10 and the movable mold 12, and has a plurality of extrusion pins 1 that penetrate the movable mold 12 and reach the inside of the cavity 12a.
6 and the movable die plate 10.
The extrusion plate 42 holds a plurality of extrusion rods 22 that penetrate through the extrusion cylinder and have one end thereof connected to the movable part 20 of an extrusion cylinder (not shown). The pressing plate 40 and the pushing plate 42 are positioned by a centering member 44, and are detachably coupled by a clamp device to be described later. , the product (not shown) in the cavity 12a is extruded.

However, the clamping device of the present invention includes a magnetic chuck device 46 that is embedded in the facing surface of the extrusion plate 42 facing the pressing plate 40 and that can be excited and released, and this magnetic chuck device 46.
A magnetic adsorption plate 40 attached to the pressing plate 40 face facing the
It consists of a. In this embodiment, the magnetic chuck device 46 is configured as a permanent magnet chuck device, and as shown in an enlarged view in FIG. 48 and
A plurality of permanent magnet blocks 52 are sequentially arranged in parallel within this case 48 with non-magnetic blocks 50 interposed therebetween, and the case 4
8, and has a plurality of non-magnetic strips 54 and magnetic strips 56 arranged on its surface corresponding to the non-magnetic blocks 50 and permanent magnet blocks 52, respectively. and a bolt 59 that is engaged with the case 48 and screwed onto the push-out plate 42 to move the case. Note that the permanent magnet blocks 52 are provided so that their N and S poles are arranged alternately. Further, the non-magnetic strip portion 54 of the lid 58 is
It can be formed by brazing a non-magnetic material into a slit previously formed in 8.

According to the clamping device of the present invention having such a configuration, if the magnetic chuck device 46 positions the permanent magnet block 52 corresponding to the magnetic strip portion 56 as shown in FIG. acts on the magnetic adsorption plate 40a of the pressing plate 40, so that the pressing plate 40 and the pushing plate 42 are reliably connected. Therefore, by moving the movable portion 20 of the pushing cylinder back and forth, the pushing pin 16 moves back and forth, and the product in the cavity 12a is taken out. On the other hand, when the case 48 is moved by appropriately operating the bolt 59 with a spanner or the like and the permanent magnet block 52 is positioned so as to correspond to the non-magnetic strip portion 54, the gap between the magnetic chuck device 46 and the pressing plate 40 is The magnetic action is released, and the connection between the pressing plate 40 and the pushing plate 42 is easily released. Therefore, it is possible to simply and easily perform die replacement work or maintenance and inspection work of the magnetic chuck device 46 and the like as required.

Note that FIG. 4 shows a detection means for detecting the coupling or release of the press plate 40 and the push plate 42.

That is, the proximity switch 70 is installed in the protrusion of the push rod 22, and the lead wire 72 is connected to the hollow hole 22 of the push rod 22.
Conductive through a. When the detection means is provided in this manner, the operation of the clamp device can be accurately confirmed, which is convenient for operation.

As described above, according to the present invention, since the clamping device is constituted by a magnetic chuck device, the operation is performed reliably, and at the same time, the maintenance and inspection work thereof becomes simple and easy.

That is, according to the present invention, the hydraulic cylinder and the movable hydraulic piping for the hydraulic cylinder in the conventional clamping device of this kind are not required, and therefore not only complicated installation work and oil leakage can be avoided, but also the structure is simple. becomes.

Next, FIG. 3 shows another embodiment of the clamp device of the present invention. In this embodiment, the magnetic chuck device is configured as an electromagnetic device instead of the permanent magnet device in the previous embodiment. That is, in FIG. 3, the electromagnetic chuck device 60 includes an electromagnetic core 62 buried in an extrusion plate 42 with its upper surface open, and a plurality of electromagnetic cores 62 sequentially arranged in parallel inside the electromagnetic core 62 with a predetermined interval apart. a magnetic cover 68 that covers the upper surface of the electromagnetic core 62 and has a plurality of non-magnetic strips 66 arranged corresponding to the electromagnetic coils 64 on its surface; It is composed of excitation current supply means (not shown) for excitation or release. Note that the electromagnetic coil 64 is configured so that its N and S poles are alternated. Further, the non-magnetic strip portion 66 of the magnetic lid 68 can be formed by brazing a non-magnetic material into a slit previously formed in the magnetic lid 68. Further, the electromagnetic iron core 62 may be formed integrally with the extruded plate 42 without being embedded therein, and it goes without saying that the electromagnetic chuck device 60 may be constructed with other known structures.

It will be easily understood that this embodiment also exhibits the same functions and effects as those of the previous embodiment. Note that, unlike the previous embodiment, this embodiment requires an electromagnetic current supply means for the electromagnetic coil 64;
Since this means consists of electrical wiring, it does not present any disturbances as in conventional movable hydraulic piping.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to the above-described embodiments, and many design changes can be made without departing from the spirit thereof.

〔Effect of the invention〕

As explained above, since the extrusion plate clamping device according to the present invention is composed of a magnetic chuck device, its operation is ensured, and at the same time, maintenance and inspection work can be performed simply and easily. In other words, the device of the present invention eliminates the need for a hydraulic cylinder and its movable pressure oil piping in conventional clamping devices of this type, and not only avoids complicated installation work, maintenance, and inspection work, but also prevents oil leakage. It has many excellent advantages, such as being effectively prevented and having a simple structure.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing an embodiment of the extrusion plate clamping device according to the present invention, FIG. 2 is a sectional view taken along line nn of FIG. 1, and FIG. 3 is a magnetic chuck in the clamping device according to the present invention. FIG. 4 is a sectional view corresponding to FIG. 2 showing another embodiment of the device;
The figure is an enlarged sectional view showing a detection means for detecting contact coupling in the clamping device according to the present invention, FIG. 5 is a side sectional view showing a conventional extrusion plate clamping device, and FIG. 6 is a VI of FIG.
-VI line arrow view. 0...Moving die plate 2...Moving mold 2a...Cavity 4...Mounting space 6...Extrusion pin 0...Movable part of extrusion cylinder 2...Extrusion rod 2a...・Hollow hole 0...Press plate Oa...Magnetic material adsorption plate 2...Extrusion plate 4...Centering member 6...Permanent magnet chuck device 8...Magnetic material case 0...Non Magnetic block 2...Permanent magnet block 4...Non-magnetic strip 6...Magnetic strip 8...Magnetic cover 9...Bolt 0...Electromagnetic chuck device 2...・Electromagnetic core 4...Electromagnetic coil 6...Non-magnetic strip 8...Magnetic cover 0...Proximity switch 2...Lead wire FIG, 3 6n FIG 6 Procedure amendment (method) % formula % 1. Indication of the case 1990 Patent Application No. 5286 2. Name of the invention Extrusion plate clamp device 3. Person making the amendment Relationship to the case Patent applicant address 4-2-11 Ginza, Chuo-ku, Tokyo Title name
(345) Toshiba Machine Co., Ltd. Representative Iwahashi
4th year of Showa, agent

Claims (4)

[Claims] (1) In an extrusion plate clamping device that clamps an extrusion pin press plate provided in the attachment space of a movable die plate and a movable mold and the extrusion plate, the An extrusion plate clamping device, characterized in that a magnetic chuck device capable of excitation and release is embedded therein, and at least an opposing surface of a pressing plate facing the magnetic chuck device is made of a magnetic material. (2) The magnetic chuck device includes a magnetic case with an open top surface that is slidably embedded in an extruded plate, and a plurality of permanent magnet blocks that are sequentially arranged in parallel within this case with non-magnetic blocks interposed between them. , a magnetic lid covering the opening of the case and having a plurality of non-magnetic strips and magnetic strips arranged on the surface thereof corresponding to the non-magnetic blocks and the permanent magnet blocks; 2. The extrusion plate clamp device according to claim 1, further comprising a moving means for moving the case. (3) A magnetic chuck device includes an electromagnetic core buried in an extruded plate with its upper surface open, a plurality of electromagnetic coils buried in parallel in sequence with a predetermined distance apart from each other in this electromagnetic core, and Consisting of a magnetic lid covering an open top surface and having a plurality of non-magnetic strips arranged on the surface corresponding to the electromagnetic coils, and excitation current supply means for exciting or releasing the electromagnetic coils. The extrusion plate clamp device according to claim 1. (4) A proximity switch for detecting the contact connection between the extrusion plate and the pressing plate is provided at the attachment part of the extrusion rod that drives the extrusion plate to the extrusion plate, and the lead wire of this proximity switch is passed through the inside of the extrusion rod. Claim 1 configured to conduct.
The described extrusion plate clamping device.