JP2016107286A - Slide pin cooling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten cycle time and to improve productivity by preventing the leakage accident of cooling water supplied to a slide pin such as a local pressing pin for cooling to omit maintenance caused by the leakage accident.SOLUTION: The slide pin cooling device includes a slide pin 2 and a retainer 12 for retaining the slide pin 2 to be slidable. In the slide pin 2, an inflow port 28 and an outflow port 27 for cooling water are formed in a non-exposure area fitted over the retainer 12 during sliding. In the retainer 12, an inflow connection port 33 for introducing the cooling water supplied from the outside to the inflow port 28 and an outflow connection port 34 for drawing the cooing water from the outflow port 27 to the outside of the retainer 12 are formed. The inflow connection port 33 and the outflow connection port 34 are formed long in the sliding direction of the slide pin 2 to always maintain a communication state during the sliding.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sliding pin cooling device that can be suitably used as a local pressure pin or the like used in a local pressure die casting method.

  In the local pressure die casting method, a part of the solidified part is directly pressed with a local pressure pin while the molten metal injected into the mold cavity solidifies, and the melt corresponding to solidification shrinkage is replenished at the same time as crushing the shrinkage nest. This method has an advantage that a high-quality die casting with few sinks can be obtained. The local pressurizing pin is configured to advance and retract by a hydraulic cylinder installed outside the mold to perform the local pressurization.

  Since the local pressure pin is heated to a high temperature by pressing the tip of the pin against the solidified portion of the molten metal, cooling is required every time one to several cycles are performed to prevent overheating. Conventionally, in order to prevent the cycle time of the local pressurization die casting method from being reduced due to the cooling of the local pressurization pin, a cooling device that circulates cooling water between the inside and outside of the local pressurization pin has been proposed. (See, for example, Patent Document 1).

  This conventional cooling device has a structure in which the cylinder rod penetrates both ends of the hydraulic cylinder, and this cylinder rod itself (the rod on the side protruding from the hydraulic cylinder toward the mold) also functions as a local pressure pin. ing. A cooling water passage is formed at the center of the cylinder rod, and a pipe for supplying and discharging cooling water is connected to the rod protruding from the hydraulic cylinder in the direction opposite to the mold. It was.

Japanese Utility Model Publication No. 4-33453

  As described above, in the conventional cooling device, the cylinder rod of the hydraulic cylinder also functions as the local pressure pin, and the piping for cooling water is connected to the cylinder rod itself. Therefore, every time the hydraulic cylinder is driven (the local pressure pin slides forward and backward toward the mold), the cooling water piping moves together with the cylinder rod, which causes the cylinder rod and the cooling water piping to There was a frequent problem that the connection part of this was damaged, leading to a water leak accident. Naturally, every time this water leak accident occurs, maintenance is required. As a result, the cycle time when the local pressure die casting method is carried out becomes longer, which leads to serious problems such as a decrease in productivity.

  The present invention has been made in view of the above circumstances, and for sliding pin-like objects (hereinafter referred to as “sliding pins”) such as local pressure pins required by the local pressure die casting method. The cooling water supplied for cooling will not cause a water leak accident, so that maintenance due to the water leak accident can be omitted, and the cycle time can be reduced by the local pressurized die casting method, etc. An object of the present invention is to provide a sliding pin cooling device that can shorten the length and improve the productivity.

In order to achieve the above object, the present invention has taken the following measures.
That is, the sliding pin cooling device according to the present invention has a sliding pin having a closed end and a cooling water passage formed therein, and a retainer that slidably fits and holds the base of the sliding pin. And an inflow port that communicates with an upstream portion of the cooling water channel and an outflow port that communicates with a downstream portion of the cooling water channel with respect to a non-exposed region that is externally fitted to the retainer when sliding. And an inflow communication port for introducing cooling water supplied from the outside to the inflow port of the sliding pin, and an outflow communication port for guiding cooling water from the outflow port to the outside of the retainer. In the mating portion between the inflow port and the inflow communication port, at least one of the ports is formed long in the sliding direction of the sliding pin and is always kept in communication when the sliding pin slides. Together with the above At least one port is consistent portion of the exit port and the outlet connection port, characterized in that it is held always communicating state at the time of sliding of the sliding pin is elongated in the sliding direction of the slide pin.

The sliding pin has a double tube structure in which an inner cylinder with an open end is fitted inside the outer cylinder with a closed end, and a distal end opening portion is formed from the inner side of the base of the inner cylinder. It is preferable that a cooling water channel communicating with the outer side of the base portion of the inner cylinder is formed through the circumferential gap.
The inflow communication port and the outflow communication port of the retainer may be formed long along the sliding direction of the sliding pin.

In this case, the inflow communication port of the retainer is formed wider than the opening width of the slide pin in the circumferential direction of the slide pin, and the outflow communication port of the retainer is formed of the slide pin. More preferably, the outlet port is formed wider than the opening width in the circumferential direction of the sliding pin.
A piston portion is provided at the rear end of the base portion of the sliding pin, and a cylinder portion is provided on the retainer so as to fit the piston portion in a slidable state. It is preferable that a sliding device for sliding the sliding pin is constructed.

  The sliding pin can be formed as a local pressurizing portion whose tip portion pressurizes the molten metal in the solidification process within the cavity of the local pressurizing die casting.

  In the sliding pin cooling device according to the present invention, the cooling water supplied for cooling does not cause a water leakage accident with respect to the sliding pins such as the local pressure pins required in the local pressure die casting method. In this way, the maintenance due to a water leak accident can be omitted, and the local pressure die casting method to be implemented can be shortened and the productivity can be improved.

It is the sectional side view which showed embodiment of the sliding pin cooling device which concerns on this invention. It is the sectional view on the AA line of FIG. It is a principal part side sectional view explaining the drive structure of a piston part. The retainer is shown, (a) is a plan view, and (b) is a cross-sectional view taken along the line BB of (a). 1 is a side sectional view schematically showing a system configuration of a local pressure die casting method.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 4 show an embodiment of a sliding pin cooling device 1 according to the present invention. This embodiment is applied to the case where the “local pressure pin” is cooled in the system configuration of the local pressure die casting method as illustrated in FIG. Therefore, hereinafter, the local pressure pin will be described as the sliding pin 2.

  In the local pressure die casting method illustrated in FIG. 5, the fixed mold 3 and the movable mold 4 are combined to form a cavity 5 therebetween, and aluminum or an alloy thereof is injected from the injection plunger 6 into the cavity 5. The molten metal in the cavity 5 is pressurized by a local pressure pin (sliding pin) 2 in the solidification process of the molten metal. The sliding drive of the sliding pin 2 is performed by a hydraulic cylinder 7, and oil feed pipes 9 and 10 are connected to the hydraulic cylinder 7 between a hydraulic source 8 such as a hydraulic pump.

  As shown in FIG. 1, the sliding pin cooling device 1 has a configuration including a sliding pin 2 as a main body and a retainer 12 that externally holds and holds the base of the sliding pin 2 in a slidable manner. The hydraulic cylinder 7 described above is connected to the rear portion of the retainer 12. As shown in FIG. 5, a water supply device 15 such as a water supply pump is connected to the retainer 12 through a water supply pipe 13 and a recovery pipe 14.

  As shown in FIGS. 1 to 4, the sliding pin 2 includes an outer cylindrical body 20 and an inner cylindrical body 21 that is fitted inside the outer cylindrical body 20 while holding a circumferential gap. It has a tube structure. The outer cylindrical body 20 is closed at its distal end portion 20a, while the inner cylindrical body 21 is opened at its distal end portion 21a, and the distal end portion 21a extends axially from the inner surface of the distal end portion 20a of the outer cylindrical body 20. It is located at a remote (retracted) position.

The outer peripheral surface of the outer cylindrical body 20 is an outer peripheral surface as the sliding pin 2. Therefore, the tip of the sliding pin 2 is closed. The closed tip of the sliding pin 2 is used as a local pressurizing part for pressurizing the molten metal in the solidification process in the cavity 5.
On the other hand, a plunger 23 is connected to the base of the outer cylinder 20 (the end opposite to the tip 20a). The plunger portion 23 forms a base portion as the sliding pin 2. On the other hand, the base portion of the inner cylindrical body 21 extends through the base portion of the outer cylindrical body 20 to the inner side of the inner portion of the plunger portion 23.

  The plunger portion 23 is formed in a cylindrical shape, and a bottomed (non-penetrating through the plunger portion 23) fitting hole 23a is formed at the end portion into which the base portion of the outer cylindrical body 20 is fitted. A connecting hole 23b having a small diameter in the extending direction is provided to the hole bottom of the fitting hole 23a, and the extended base portion of the inner cylinder 21 is screwed or press-fitted into the connecting hole 23b. Thereby, the inner cylinder 21 and the plunger part 23 are connected.

  Furthermore, an outflow port 27 that extends in the radial direction of the plunger portion 23 from the inside of the fitting hole 23a (a position that does not communicate with the base portion of the inner cylindrical body 21) and opens at the outer peripheral surface is formed in the plunger portion 23. ing. In addition, the plunger portion 23 has a plunger hole 23 in a connecting hole 23b for the inner cylinder 21 provided at the bottom of the fitting hole 23a (a position where the plunger portion 23 is not in communication with the base portion of the outer cylinder 20). An inflow port 28 extending in the radial direction and opening at the outer peripheral surface is formed.

  Naturally, the outflow port 27 and the inflow port 28 are arranged slightly apart in the axial direction of the sliding pin 2. Further, both the outflow port 27 and the inflow port 28 are disposed in a region that is accommodated in the retainer 12 and is not exposed when the sliding pin 2 slides with respect to the retainer 12. Needless to say. In the present embodiment, the outflow port 27 and the inflow port 28 are arranged in a direction opposite to the radial direction of the plunger portion 23 (a relation of 180 °), but this arrangement relation is particularly limited. is not.

  As a result of these, from the inflow port 28 that opens at the base outer peripheral surface of the sliding pin 2 (the outer peripheral surface of the plunger portion 23), the inner cylinder 21 through the inner side of the inner cylinder 21 and the inside of the inner cylinder 21. To the front end portion 21a (open portion) of the inner cylindrical body 21, and further from the front end portion 21a of the inner cylindrical body 21 through a circumferential gap (outside the inner cylindrical body 21) between the outer cylindrical body 20 and the inner cylindrical body 21. A passage communicating with the outflow port 27 opened at the outer peripheral surface of the base of the sliding pin 2 (the outer peripheral surface of the plunger portion 23) is formed.

Among these, a communicating portion from the inner side of the inner cylinder 21 to the outer side of the inner cylinder 21 via the tip 21 a of the inner cylinder 21 is used as the cooling water channel 30. Therefore, the inflow port 28 communicates with the upstream portion of the cooling water passage 30, and the outflow port 27 communicates with the downstream portion of the cooling water passage 30.
The cooling water channel 30 is formed in the opposite direction to the above description from the outside of the base portion of the inner cylinder body 21 through the circumferential gap between the outer cylinder body 20 and the inner cylinder body 21 and the tip end portion 21a of the inner cylinder body 21. It is also possible to circulate the cooling water so as to reach the inside of the cylindrical body 21 and the inside of the base portion of the inner cylindrical body 21. In this case, the port designated as “outflow port 27” in the above description is used as “inflow port”, and the port designated as “inflow port 28” in the above description is used as “outflow port”. .

However, in order to enhance the cooling effect by the cooling water as much as possible, it is preferable to feed the cooling water to the tip end portion 21a of the inner cylinder 221 at a low temperature. It is good to use in the direction which distribute | circulates from the base inner side to the outer side of the base of the inner cylinder 21 through the front-end | tip part 21a of the inner cylinder 21. FIG.
An inflow communication port 33 and an outflow communication port 34 are provided on the retainer 12 that slidably fits the base portion (plunger portion 23) of the slide pin 2 having such a configuration. The inflow communication port 33 is for introducing the cooling water supplied from the water supply device 15 (see FIG. 5) through the water supply pipe 13 to the inflow port 28 of the sliding pin 2, and the outflow communication with this. The port 34 is for guiding cooling water flowing out from the outflow port 27 of the sliding pin 2 out of the retainer 12.

In the present embodiment, the cooling water recovered at the outflow communication port 34 is guided to the water supply device 15 by the recovery pipe 14, whereby the cooling water is circulated between the sliding pin 2 and the water supply device 15. It is made to do.
As shown in an enlarged view in FIG. 3, the inflow communication port 33 and the outflow communication port 34 are opened at least on the inner peripheral surface of the retainer 12 (the surface holding the outer peripheral surface of the sliding pin 2) (described later with reference to FIG. 2). The "opening 33a" and the "opening 34a") are formed long along the sliding direction X (axial direction) of the sliding pin 2.

  Therefore, in the opening 33a of the inflow communication port 33, no matter how the sliding pin 2 slides within a predetermined stroke, the matching state is always maintained with the inflow port 28 of the sliding pin 2. . Similarly, in the opening 34a of the outflow communication port 34, no matter how the sliding pin 2 slides within a predetermined stroke, the matching state is always maintained with the outflow port 27 of the sliding pin 2. The

  As shown in FIG. 2, in the retainer 12, the inflow communication port 33 includes an opening 33 a that opens on the inner peripheral surface of the retainer 12, and a guide hole 33 b that connects the opening 33 a to the outer surface of the retainer 12. Has been. The water supply pipe 13 used for connection with the water supply apparatus 15 (refer FIG. 5) is connected with the exit part of this guide hole 33b. Similarly, the outflow communication port 34 is also formed with an opening 34 a that opens on the inner peripheral surface of the retainer 12, and a guide hole 34 b that connects the opening 34 a to the outer surface of the retainer 12. And the recovery pipe 14 used for a connection with the water supply apparatus 15 is connected with the exit part of this guide hole 34b.

  The opening 33 a of the inflow communication port 33 is formed wider than the opening width along the circumferential direction of the sliding pin 2 compared to the inflow port 28 of the sliding pin 2. For this reason, the cooling water introduced from the water supply device 15 to the inflow port 28 of the sliding pin 2 via the inflow communication port 33 is not transferred to the inflow port 28 all at once. Then, the inside of the opening 33 a of the inflow communication port 33 is filled (stayed), and then the transition is performed according to the opening area of the inflow port 28.

  At this time, the cooling water stays in the opening 33a of the inflow communication port 33, so that the cooling water contacts the outer peripheral surface of the sliding pin 2 and cools the sliding pin 2 from the outer peripheral surface. . Thereby, the sliding pin 2 receives the effect that the base outer peripheral surface is further cooled. As described above, since the inflow communication port 33 is formed long in the sliding direction X of the sliding pin 2, this cooling effect is further enhanced.

  Similarly, the opening 34 a of the outflow communication port 34 is formed wider than the opening width along the circumferential direction of the sliding pin 2 compared to the outflow port 27 of the sliding pin 2. Therefore, after cooling the sliding pin 2 by passing through the inside of the sliding pin 2, all of the cooling water flowing out from the outflow port 27 of the sliding pin 2 to the outflow communication port 34 flows out at once. Instead of shifting (passing) to the guide hole 34b of the port 34, the port 34 once fills (stays) in the opening 34a of the outflow communication port 34, and then shifts according to the opening area of the guide hole 34b. Done.

  At this time, the cooling water stays in the opening 34 a of the outflow communication port 34, so that the cooling water comes into contact with the inner surface of the opening 34 a and is absorbed by the retainer 12. As a result, the cooling water is subjected to an effect that a certain amount of rough heat is removed before being recovered into the water supply device 15 and temperature control in the water supply device 15 is reduced. As described above, since the outflow communication port 34 is formed long in the sliding direction X of the sliding pin 2, the effect of reducing the temperature control is further enhanced.

In order to increase the opening width of the opening 33a of the inflow communication port 33 and the opening 34a of the outflow communication port 34, an end mill, a medium grit bit, etc. are formed from the hollow portion of the retainer 12 (the cavity for accommodating the sliding pin 2). This can be achieved by processing while moving in the direction (eccentric direction) and the circumferential direction.
In this embodiment, due to the rotation of the sliding pin 2 (plunger portion 23) relative to the retainer 12, the opening 33a of the inflow communication port 33 and the inflow port 28 are brought into a non-matching state, or the outflow communication port 34 In order to prevent the opening 34a and the outflow port 27 from reaching a non-matching state, a measure for preventing the sliding pin 2 from rotating is taken.

  As shown in FIGS. 1 and 2, this anti-rotation measure includes a slide shaft 46 in which the sliding direction X of the sliding pin 2 is parallel to the axial center of the plunger 23 via a bracket 45 and a retainer. 12 is realized by providing a shaft passing tool 47 for guiding the sliding of the sliding shaft 46. In order to prevent this rotation, it is sufficient to prevent the rotation of the sliding pin 2 with respect to the retainer 12, so that the sliding shaft 46 is attached to the retainer 12 and the shaft passing tool 47 is attached to the plunger portion 23. Also good. Further, the shape, mounting structure, mounting arrangement, and the like of the slide shaft 46 and the shaft passer 47 can be changed as appropriate, and can be replaced with a general-purpose structure such as a combination structure of a key and a key groove.

  By the way, in this embodiment, the hydraulic cylinder 7 (see FIG. 5) connected to the rear portion of the retainer 12 has a base rear end (that is, the sliding pin 2 of the sliding pin 2) as shown in FIGS. The piston portion 40 is integrally provided at the rear end of the base portion, and the cylinder portion 41 that is externally fitted in a slidable state is connected to the retainer 12. In other words, the sliding pin 2 (plunger portion 23) is integrally provided on the cylinder rod of the hydraulic cylinder 7.

For this reason, the combination of the sliding pin 2, the retainer 12, and the hydraulic cylinder 7 can be simplified in structure, reduced in size (especially shortened in the axial direction), reduced in weight, etc., and reduced in cost. The advantage that it leads to the conversion is also obtained.
In the sliding pin cooling device 1 of the present invention having the configuration described in detail above, the primary side port 7a is pressurized against the hydraulic cylinder 7 and the secondary side port 7b is depressurized, whereby the sliding pin 2 is moved into the cavity 5. On the contrary, the secondary port 7b is pressurized against the hydraulic cylinder 7 and the primary port 7a is depressurized, so that the sliding pin 2 is advanced toward the cavity 5 to be in a pressurized state. Can do.

  The sliding pin 2 is cooled by supplying cooling water from the water supply device 15 to the inflow port 28 of the sliding pin 2 through the water supply pipe 13 and the inflow communication port 33 of the retainer 12. In addition, the cooling water after cooling the sliding pin 2 is recovered from the outflow port 27 of the sliding pin 2 to the water supply device 15 through the outflow communication port 34 of the retainer 12 and the recovery pipe 14. Perform circulation supply.

  As described above, the inflow communication port 33 of the retainer 12 and the inflow port 28 of the slide pin 2 and the outflow port 27 of the slide pin 2 and the outflow communication port 34 of the retainer 12 are always kept in a matched state. Therefore, it is possible to circulate the cooling water by the water supply device 15 not only when the sliding pin 2 is in the advanced and pressurized state, but also when the sliding pin 2 is retracted, during the advancement and during the backward movement. Therefore, the sliding pin 2 can be always kept in a cooled state.

  In such an operating state, in the sliding pin cooling device 1 according to the present invention, the sliding pin 2 is within a specified stroke with respect to the retainer 12 provided to guide the sliding of the sliding pin 2. Even if it slides in any way, it is constituted so that a passage of cooling water can be always secured between the sliding pins 2. That is, unlike the conventional case, there is no cooling water pipe that moves together with the cylinder rod, and the connection portion between the cylinder rod and the cooling water pipe does not break at all. Therefore, there will be no water leakage accident of cooling water.

This eliminates the need for maintenance caused by a water leakage accident, and shortens cycle time and improves productivity in the local pressure die casting method to be implemented.
By the way, this invention is not limited to the said embodiment, It can change suitably according to embodiment.

For example, the use of the sliding pin cooling device 1 according to the present invention is not limited, and for preventing overheating such as dies such as casting and forging other than the local pressure die casting method, various press devices, etc. It can be widely used in situations where water cooling is required (sliding pin-like objects).
In the above embodiment, the opening 33a of the inflow communication port 33 and the opening 34a of the outflow communication port 34 provided in the retainer 12 are formed long in the sliding direction X of the sliding pin 2. The opening on the side facing the inner peripheral surface of the retainer 12 at the inflow port 28 and the outflow port 27 of the sliding pin 2 may be formed long in the sliding direction X of the sliding pin 2. Further, both the opening 33a of the inflow communication port 33 and the inner circumferential opening of the inflow port 28 may be lengthened, or both the opening 34a of the outflow communication port 34 and the inner circumferential opening of the outflow port 27 may be lengthened. Good.

It is not limited that the piston portion 40 is provided at the base portion of the sliding pin 2 and the cylinder portion 41 is connected to the retainer 12 to form the hydraulic cylinder 7 with these. The hydraulic cylinder 7 is configured independently. Alternatively, another push / pull device may be connected to the base end of the slide pin 2.
Circulation of the cooling water between the sliding pin 2 and the water supply device 15 is not limited. For example, the cooling water flowing out from the outflow communication port 34 of the retainer 12 can be drained or used secondarily. You may make it do. In this case, the coolant may be directly supplied from a water pipe or the like without using the water supply device 15.

DESCRIPTION OF SYMBOLS 1 Sliding pin cooling device 2 Sliding pin 3 Fixed type 4 Movable type 5 Cavity 6 Injection plunger 7 Hydraulic cylinder 7a Primary side port 7b Secondary side port 8 Hydraulic source 9,10 Oil feed pipe 12 Retainer 13 Water supply pipe 14 Recovery pipe DESCRIPTION OF SYMBOLS 15 Water supply apparatus 20 Outer cylinder 20a Tip part 21 Inner cylinder 21a Tip part 23 Plunger part 23a Fitting hole 23b Connection hole 27 Outflow port 28 Inflow port 30 Cooling water path 33 Inflow communication port 33a Opening 33b Conduction hole 34 Outflow communication port 34a Opening 34b Conducting hole 40 Piston part 41 Cylinder part 45 Bracket 46 Sliding shaft 47 Shaft threader

Claims (6)

A sliding pin with a tip closed and a cooling water channel formed inside;
A retainer that slidably fits and holds the base of the sliding pin,
An inflow port that communicates with an upstream portion of the cooling water channel and an outflow port that communicates with a downstream portion of the cooling water channel with respect to a non-exposed region that is externally fitted to the retainer during sliding are formed at the base of the sliding pin. Has been
The retainer is provided with an inflow communication port for introducing cooling water supplied from the outside into the inflow port of the sliding pin and an outflow communication port for guiding cooling water from the outflow port out of the retainer,
At the mating portion of the inflow port and the inflow communication port, at least one port is formed long in the sliding direction of the sliding pin, and is always kept in communication when the sliding pin slides,
The sliding portion is characterized in that at least one port is formed long in the sliding direction of the sliding pin at the mating portion between the outflow port and the outflow communication port and is always kept in communication when the sliding pin slides. Moving pin cooling device.   The sliding pin has a double tube structure in which an inner cylinder with an open end is fitted inside the outer cylinder with a closed end, and a distal end opening portion is formed from the inner side of the base of the inner cylinder. The cooling pin cooling device according to claim 1, wherein a cooling water channel is formed to communicate with the outside of the base portion of the inner cylinder through the circumferential gap.   The sliding pin cooling device according to claim 1 or 2, wherein the inflow communication port and the outflow communication port of the retainer are formed long along a sliding direction of the sliding pin.   The inflow communication port of the retainer is formed wider than the opening width in the circumferential direction of the slide pin in the inflow port of the slide pin, and the outflow communication port of the retainer is in the outflow port of the slide pin. 4. The sliding pin cooling device according to claim 3, wherein the sliding pin cooling device is formed wider than the opening width in the circumferential direction of the sliding pin.   A piston portion is provided at the rear end of the base portion of the sliding pin, and a cylinder portion is provided on the retainer so as to fit the piston portion in a slidable state. The sliding pin cooling device according to any one of claims 1 to 4, wherein a sliding device is configured to slide the sliding pin.   6. The sliding pin according to claim 1, wherein a tip portion of the sliding pin is formed as a local pressurizing portion that pressurizes a molten metal in a solidifying process within a cavity of the local pressurizing die casting. The sliding pin cooling device described in 1.

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