JP2010269319A - Die casting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a casting device 1 capable of controlling the fed amount of lubricating oil "k" lubricating the sleeve 3, and controlling the feeding position in the sleeve 3, in the casting device where a molten metal "m" fed to a sleeve 3 is press-fed to the inside of dies 26, 27, by a plunger tip 2. <P>SOLUTION: In the casting device where a molten metal m is press-fed into a die by a plunger tip 2 installed in a plunger rod 4, the plunger tip 2 is provided with a feed path 16 feeding the lubricating oil "k", and the feed path 16 and a circulation path 15 formed circularly at the plunger tip 2 are communicated, and the circulation path 15 and a plurality of discharge holes 14 provided at the surface of the plunger tip 2 are communicated. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a casting apparatus made of a non-ferrous metal such as aluminum or magnesium, and an alloy thereof.

  Casting is known as one of the methods for producing metal parts and the like, and in particular, a casting apparatus for efficiently producing a cast product by casting is known. FIG. 7 shows an outline of a conventional casting apparatus 1X. This casting apparatus 1X has a fixed die 26 and a movable plate 29 disposed inside a fixed plate 26 and a movable plate 29, and the two molds. A molten metal material (hereinafter referred to as molten metal m) is poured into a space (hereinafter referred to as cavity 31) formed in close contact with each other to produce a cast product.

  The casting process of the casting device 1X includes a step of supplying the molten metal m to the hot water supply port 30 of the cylindrical sleeve 3 by a hot water supply device such as a ladle 25, and a plunger chip provided with the molten metal m in the cylinder device 5. 2X has a step of press-fitting into the cavity 31. The plunger tip 2X is installed in the cylinder device 5 via a plunger rod 4X (see Patent Documents 1 and 2).

  At this time, since the plunger chip 2X needs to press the molten metal m into the cavity 31 with a high pressure, the plunger chip 2X is configured to slide in the sleeve 3 with almost no gap from the inside of the sleeve 3. . For this reason, a method has been disclosed in which lubricating oil is supplied to the plunger tip 2X immediately before fitting into the sleeve 3 to smooth the sliding of the plunger tip 2X (see, for example, Patent Document 3). When the plunger tip 2X and the sleeve 3 are not sufficiently lubricated, deterioration due to wear of the plunger tip 2X and the sleeve 3 is accelerated, and the casting cost is increased.

  FIG. 8 shows an example of a mechanism for supplying lubricating oil. This mechanism is configured to supply the lubricating oil k from the supply path 16X to the plunger tip 2X that passes through the inlet of the sleeve 3. However, since the lubricating oil cannot be sufficiently supplied to a necessary place in the sleeve 3, the plunger tip 2 is not sufficiently lubricated at present. That is, since the lubricating oil k is supplied at the inlet of the sleeve 3, it is difficult to supply the lubricating oil k to the intermediate portion T.

  Further, when the lubricant k is supplied from above the plunger tip 2X, it is difficult to lubricate only the contact surface between the plunger tip 2X and the upper surface of the sleeve 3 and supply the lubricant k sufficiently to the lower surface of the sleeve 3. There is a problem that there is.

  In order to supply the lubricating oil k to the intermediate portion T of the sleeve 3 with respect to the above problem, the lubricating oil k may be supplied to the outlet portion U of the sleeve 3 when the supply amount of the lubricating oil k is increased. There is sex. When this lubricating oil k is supplied to the outlet portion U, there is a possibility that the lubricating oil k will be pressed into the mold together with the molten metal m, and the mixing of this lubricating oil k will deteriorate the quality of the cast product. There is a problem that the yield is lowered. This problem is particularly noticeable in the case of aluminum products. Further, there is a problem that the lubricating oil k flows out from the inlet portion S of the sleeve 3 and contaminates the periphery of the casting apparatus with the lubricating oil k. As described above, conventionally, it has been very difficult to control the supply amount of the lubricating oil k and the supply position of the lubricating oil in the sleeve.

Although the sleeve 3 is divided into an inlet portion S, an intermediate portion T, and an outlet portion U, the outlet portion U is an area where no lubricating oil is supplied because it affects the quality of the cast product. However, it is a region that needs to be supplied with lubricating oil, and the inlet portion S indicates other regions.

JP 2001-150116 A JP 2000-158114 A JP 2008-229691 A

  The present invention has been made in view of the above situation, and an object of the present invention is to provide a supply amount of lubricating oil for lubricating the sleeve in a casting apparatus in which the molten metal supplied to the sleeve is press-fitted into the mold by a plunger tip. It is an object of the present invention to provide a casting apparatus capable of controlling and controlling a supply position in a sleeve.

  In order to achieve the above object, a casting apparatus according to the present invention is a casting apparatus in which a molten metal is press-fitted into a mold by a plunger tip installed on a plunger rod, and a supply path for supplying the lubricant oil to the plunger tip is provided. Provided, and a circulation path formed in a circumferential shape is communicated with the supply path and the plunger tip, and a plurality of discharge holes provided on the surface of the plunger chip are communicated with each other.

  In the casting apparatus, the plunger tip has a tip head and a tip ring wound around the outer periphery of the tip head, and the circulation path is formed in a circumferential shape on the outer peripheral surface of the tip head, A plurality of the discharge holes are formed in the tip ring.

  In the casting apparatus, the plunger tip has a rear end tip ring wound around the outer periphery of the tip head, forms a second circulation path along the outer peripheral surface of the tip head, and the rear end A plurality of the discharge holes are formed in the tip ring.

  In the casting apparatus, a three-layer pipe having the supply path for supplying the lubricant oil to the plunger tip, a cooling water supply pipe for supplying cooling water, and a cooling water discharge pipe for discharging the cooling water. It is characterized by being installed.

  According to the casting apparatus according to the present invention, it is possible to control the supply position of the lubricating oil and the supply amount of the lubricating oil in the sleeve by the configuration in which the lubricating oil is supplied from the outer peripheral surface of the plunger tip. Further, since the lubricating oil is discharged from the plunger tip itself that becomes the sliding surface, it is possible to control the oil film formed on the plunger tip surface, and it is possible to improve the durability of the plunger tip. Therefore, it is not necessary to supply lubricating oil more than necessary, and the quality and yield of the cast product can be improved. Particularly in the case of an aluminum product, it is possible to obtain significant effects of quality improvement and yield improvement.

  In addition, the configuration in which the lubricating oil is supplied to the plurality of discharge holes through the circulation path formed in a circumferential shape from the supply path allows the lubricating oil to be supplied into the sleeve from the plurality of discharge holes after being supplied once to the circulation path. Therefore, the pressure of the lubricating oil discharged from the plurality of discharge holes can be made the same. That is, the lubricating oil can be supplied uniformly over the entire circumference of the sleeve.

  Furthermore, since the circulation path is formed on the surface of the chip head by forming the circulation path on the outer peripheral surface of the chip head and forming a plurality of discharge holes in the chip ring, the processing when creating the chip head Since the discharge hole is formed in the tip ring, the discharge hole can be easily processed. The tip ring may be fixed to the tip head. However, since the tip ring is a component that is heavily worn and needs to be replaced, it is often installed rotatably on the tip head. Even in this case, since the discharge holes are communicated with each other through the circumferential circulation path, the lubricating oil can be supplied without being affected by the rotation of the tip ring.

  Further, the second circulation path is formed on the outer peripheral surface of the chip head, and a plurality of discharge holes are formed in the rear end chip ring, so that the lubricating oil can be supplied to the combination of the circulation path and the chip ring, It becomes possible to carry out from two systems of a combination of a circulation path and a rear end tip ring. For this reason, the supply position of the lubricating oil and the supply amount of the lubricating oil in the sleeve can be controlled more precisely. In other words, with a configuration in which the supply of lubricating oil is performed by two or more systems, the supply amount is changed by controlling the supply pressure of the lubricating oil for each system, or different types of lubricating oil are supplied for each system It is possible to freely perform control and the like.

  In addition, a three-layer pipe is formed by the supply path, the cooling water supply pipe, and the cooling water discharge pipe, and the lubricating tip and the cooling water are supplied and discharged by this three-layer pipe. Release work becomes easy. That is, when exchanging the plunger tip due to wear or the like, an operation such as alignment in the rotation direction of the supply path between the plunger tip and the plunger rod becomes unnecessary. Therefore, it becomes easy to adopt a structure in which lubricating oil is supplied directly from the plunger tip.

  Further, in the above casting apparatus, the plunger chip has a cup-shaped chip head and a chip body that is inserted and connected from an opening at the back of the chip head, and the chip head has an opening at the opening. A piston ring locking groove is provided, a piston ring corresponding to the piston ring locking groove is installed on the outer periphery of the chip body, the piston ring is locked to the piston ring locking groove, and the chip head and the chip You may comprise so that a main body may be connected.

  With this configuration, the chip head and the chip main body, which are conventionally connected by a structure such as a screw, can be connected by the piston ring, so that the chip head can be connected without rotating. Therefore, in the conventional structure of the plunger tip, it is possible to solve the problem that it is difficult to align the lubricating oil supply passage provided on the plunger rod and the supply passage provided on the plunger tip. Furthermore, since the tip head and the tip body can be easily attached and detached, the tip head or the tip ring that is heavily worn can be easily replaced. That is, it is desirable that the lubricating oil to be supplied to the sleeve and the plunger tip has a mechanism for exchanging a highly worn member such as a tip head in addition to a mechanism for supplying the lubricating oil to an arbitrary place.

It is a figure which shows the structure of the plunger tip of embodiment which concerns on this invention. It is a figure which shows the structure of the plunger tip of embodiment which concerns on this invention. It is a figure which shows the cross section of the plunger tip of embodiment which concerns on this invention. It is a figure which shows the connection mechanism of a chip head and a chip body. It is a figure which shows the connection mechanism of a chip head and a chip body. It is a figure which shows the circulation path formed in the chip head surface. It is a figure which shows the structure of a die-cast apparatus. It is a figure which shows the conventional lubricating oil supply mechanism.

  Hereinafter, a casting apparatus according to an embodiment of the present invention will be described with reference to the drawings. 1 and 2 are exploded views of the plunger tip 2 of the casting apparatus 1 according to the embodiment of the present invention. FIG. 1 shows a tip head 10, a tip ring 12, and a rear end tip ring 13, and FIG. A chip body 11 is shown.

  FIG. 1 shows an exploded view of the chip head 10 and the chip ring 12 and the rear end chip ring 13 wound around the outer periphery thereof. The chip head 10 has a pressing surface 18 that presses the molten metal m at the tip, and has a circumferential circulation path 15 and a second circulation path 15b on the outer peripheral surface, and the circulation paths 15 and 15b. Are in communication with supply passages 16 and 16b for supplying the lubricating oil k, respectively.

  The tip ring 12 is installed so as to cover the outer periphery of the circulation path 15 and has a plurality of discharge holes 14 penetrating the tip ring 12. Similarly, the rear end tip ring 13 is installed so as to cover the outer periphery of the circulation path 15 b and has a plurality of discharge holes 14 b penetrating the rear end tip ring 13.

  Here, the chip head 10 is formed of a hardened steel material such as S45C (carbon steel material for mechanical structure), and the pressing surface 18 that presses the molten metal has a thickness of about 0.7 to 1.0 mm by spraying a cobalt alloy or the like. Further, it is desirable to form a thick layer. The tip ring 12 is preferably made of an abrasion-resistant material, for example, by surface spraying a cobalt alloy on S45C. Furthermore, the rear end tip ring 13 is preferably made of a lubricious material, for example, beryllium copper alloy or oilless metal.

  The supply of the lubricating oil k is independently performed in the first system that communicates the discharge hole 14, the circulation path 15, and the supply path 16, and in the second system that communicates the discharge hole 14b, the circulation path 15b, and the supply path 16b. By performing, the control for supplying the lubricating oil k can be performed more precisely. At this time, the circulation path 15b and the supply path 16 are configured not to communicate with each other. On the other hand, when the line for supplying the lubricating oil k is one system, the circulation paths 15 and 15b and the supply path 16 may be configured to communicate with each other. At this time, it is not necessary to form the supply path 16b.

  Further, when the tip ring 12 is not fixed to the tip head 10 and is installed in a rotatable state, the discharge holes 14 are desirably formed uniformly on the tip ring 12. Further, the number of discharge holes 14 can be appropriately changed depending on the size of the plunger tip 2 and the like. The same applies to the rear end tip ring 13.

  Further, a fitting portion such as a key groove may be provided so that the tip ring 12 and the rear end tip ring 13 rotate simultaneously. At this time, the lubricating oil k can be uniformly supplied to the sleeve 3 by shifting the positions of the discharge holes 14 and the discharge holes 14b in the rotation direction and alternately arranging them on the circumference of the plunger tip 2.

  FIG. 2 shows the chip body 11, which includes a cooling water supply pipe 21 that supplies the cooling water w to the chip head 10, a cooling water discharge pipe 22 that discharges the cooling water w, and lubricating oil k. The supply path 16 is supplied. Further, the chip body 11 has an annular piston ring 24 for connecting to the chip head 10 and an O-ring 23 for preventing leakage of the cooling water w.

  FIG. 3 shows a cross-sectional view of the plunger tip 2, and the plunger tip 2 includes a tip head 10, a tip body 11, a tip ring 12, and a rear end tip ring 13. First, the flow of the lubricating oil k in the plunger tip 2 will be described. Lubricating oil k is supplied to the supply path 16 of the plunger tip 2 from the plunger rod 4 (not shown). The lubricating oil k supplied to the plunger tip 2 passes through the inside of the tip body 11 and flows from the side to the supply path 16 of the tip head 10, and on the outer peripheral surface of the tip head 10 as well as the tip ring 12 and the rear end tip. It is configured to flow on the inner peripheral side of the ring 12b, flow to the circulation path 15, and further flow into the sleeve 3 from the circulation path 15 through the discharge hole 14 (first system).

  Further, the lubricating oil k flows from the inside of the chip body 11 to the supply path 16b and the second circulation path 15b, and flows into the sleeve 3 from the discharge hole 14b provided in the rear end chip ring 13 (first). 2 systems).

  Next, the flow of the cooling water w in the plunger tip 2 will be described. The cooling water w is supplied from the plunger rod 4 (not shown) to the cooling water supply pipe 21 of the plunger tip 2. Thereafter, the cooling water w circulates in the cooling water chamber 17 formed by the chip head 10 and the chip body 11 and is discharged from the cooling water discharge pipe 22 to the plunger rod 4 side.

  The cooling water supply pipe 21, the cooling water discharge pipe 22, and the supply path 16 for the lubricating oil k may be configured as a three-layer pipe having a three-layer structure. Since the plunger tip 2 and the plunger rod 4 are connected by rotation of the plunger tip 2 having a screw structure or the like, the plunger tip 2 has a configuration in which fluid is conveyed by a three-layer pipe concentrically extending from the center of the plunger tip 2 or the like. It is not necessary to perform alignment for connecting the supply path 16 of the plunger rod 4 to the plunger 2. Therefore, the replacement operation of the plunger tip 2 is easy and can be performed in a short time.

  FIG. 4 shows a step of forming the plunger tip 2 by inserting the tip body 11 from the opening at the back of the tip head 10. FIG. 4A shows a state in which the chip body 11 has started to be inserted, and a circumferential piston ring locking groove 35 is provided on the inner peripheral side of the rear opening of the chip head 10. The piston ring locking groove 35 is formed so that an annular piston ring 24 installed on the outer periphery of the chip body 11 is fitted.

  FIG. 4B shows a state in which the chip body 11 is inserted into the opening of the chip head 10, and the insertion screw 33 is inserted into the screw hole 32 after the insertion is completed. With this insertion screw 33, the piston ring 24 is expanded in the outer circumferential direction (downward in FIG. 4), and the chip head 10 is moved to the chip body 11 by the action of the tapers 34a and 34b respectively provided in the piston ring 24 and the piston ring locking groove 35. Press firmly to connect securely.

  With this configuration, for example, the left and right alignment in FIG. 4 of the lubricant supply path 16 provided in the chip body 11 and the supply path 16b provided in the chip head 10 is facilitated. That is, since the chip head 10 and the chip body 11 are always connected at a predetermined position, the supply paths 16 and 16b are not divided. Thus, since the tip head 10, the tip ring 12 wound around the outer periphery thereof, and the rear end tip ring 13 can be exchanged by a simple operation such as inserting the insertion screw 33, the plunger tip 2 and the like. It is possible to supply the lubricating oil from the outer peripheral surface of the plunger tip 2 while enabling replacement of the deteriorated parts.

  FIG. 5 shows the positional relationship between the piston ring 24 and the screw hole 32. FIG. 5A shows a piston ring 24 having a cutting portion 24 a and three screw holes 32 provided in the chip body 11. The piston ring 24 is in a position where a part of the screw hole 32 is closed, and corresponds to the piston ring 24 shown in FIGS. 4A and 4B.

When the insertion screw 33 is inserted into the screw hole 32, as shown in FIG. 5B, the insertion screw 33 spreads the piston ring 24 in the outer peripheral direction, and connects and fixes the chip head 10 and the chip body 11. At this time, the piston ring 24 is in an evenly expanded state, and the chip head 1
The force relating to the connecting portion between 0 and the chip body 11 can be evenly distributed, and it can also function as an auxiliary leakage prevention mechanism for the O-ring 23 used for preventing leakage of the cooling water.

  The piston ring 24 is preferably formed of a material having elasticity such as spring steel. With this configuration, when the insertion screw 33 is removed, the piston ring 24 returns to the state shown in FIG. 5A with an elastic force, so that the plunger tip 2 can be disassembled by pulling out the tip head 10 thereafter.

  FIG. 6 shows a state of the circulation path 15 formed on the outer peripheral surface of the chip head 10. Here, the upper part from the one-dot chain line shows a developed view of the upper half of the chip head 10 and the lower part of the lower half of the chip head 10. FIG. 6A shows a state where the outer peripheral surface of the chip head 10 shown in FIG. 1 is developed. In the chip head 10 of FIG. 6A, the lubricating oil k flows from the communication hole 19 to the supply path 16 and is supplied to the circulation path 15, and from the communication hole 19b to the supply path 16b and is supplied to the circulation path 15b. It has two independent systems of the second system.

  FIG. 6B shows a chip head 10 of a different embodiment. In the chip head 10 of FIG. 6B, the lubricating oil k flows from the communication hole 19 to the supply path 16, flows through the circulation paths 15c and 15d, and flows from the communication hole 19b to the supply path 16b to the circulation paths 15e and 15f. Has a second system to supply

  With this configuration, for example, it is possible to perform control such that the lubricating oil k is supplied to the first system corresponding to the upper half of the plunger chip 2 at a high pressure and supplied to the second system corresponding to the lower half at a low pressure. As a result, the lubricating oil k supplied from the upper half discharge holes 14 and 14b of the plunger chip 2 flows downward due to gravity, and a uniform supply of the lubricating oil k can be realized on the inner peripheral surface of the sleeve 3. .

  Next, control when supplying the lubricating oil k will be described. First, when the plunger tip 2 is at the inlet portion S and the intermediate portion T of the sleeve 3 shown in FIG. 8, the lubricating oil k is pressurized by a pump or the like, and the sleeve is passed through the supply path 16 of the plunger rod 4. 3 is supplied. And when the plunger tip 2 exists in the exit part U, supply of the lubricating oil k is stopped, and it controls to prevent the quality fall and yield fall of a casting product.

  Moreover, the system | strain which supplies the lubricating oil k is good also as a some system | strain like a 1st system | strain and a 2nd system | strain. It is also possible to precisely control the amount of the lubricating oil k in the sleeve 3 by controlling each of the plurality of systems.

  With the above casting apparatus, it is possible to supply the lubricating oil k to the intermediate portion T of the sleeve 3 that could not be supplied with the lubricating oil k conventionally. For this reason, it is possible to prolong the replacement cycle of the sleeve 3 and the plunger tip 2 that are severely deteriorated due to wear or the like, and it is possible to reduce the production cost of the cast product.

DESCRIPTION OF SYMBOLS 1 Casting apparatus 2 Plunger tip 3 Sleeve 10 Tip head 11 Tip body 12 Tip ring 13 Rear end tip ring 14, 14b Discharge hole 15 Circulation path 15b Second circulation path 16 Supply path 21 Cooling water supply pipe 22 Cooling water discharge pipe k Lubrication Oil w Cooling water m Molten metal S Inlet part T Intermediate part U Outlet part

Claims (4)

In the casting device that press-fits the molten metal into the mold by the plunger tip installed on the plunger rod,
A plurality of discharge holes provided on the surface of the circulation path and the plunger chip, the supply path for supplying the lubricant oil to the plunger tip, the circulation path formed in a circumferential shape to the plunger chip; A casting apparatus characterized by communicating with each other.   The plunger tip has a tip head and a tip ring wound around the outer periphery of the tip head, the circulation path is formed in a circumferential shape on the outer peripheral surface of the tip head, and a plurality of the tip rings are formed on the tip ring. The casting apparatus according to claim 1, wherein discharge holes are formed.   The plunger tip has a rear end tip ring wound around the outer periphery of the tip head, forms a second circulation path along the outer peripheral surface of the tip head, and a plurality of the rear end tip rings are formed on the rear end tip ring. The casting apparatus according to claim 2, wherein a discharge hole is formed.   The plunger chip is provided with a three-layer pipe having the supply passage for supplying the lubricating oil, a cooling water supply pipe for supplying cooling water, and a cooling water discharge pipe for discharging the cooling water. The casting apparatus according to claim 1, wherein the casting apparatus is characterized in that:

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