JP2005349452A - Diecasting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an excellently maintainable diecasting device capable of more uniformly applying a lubricant to the inner wall of a plunger sleeve. <P>SOLUTION: A ring-shaped member 10 is inserted into an insertion part 13a of a plunger rod 13. At the plunger rod 13, a lubricant feed path 12 for feeding a lubricant is formed, and, at the ring-shaped member 10, a plurality of discharge holes 15 communicating with the lubricant feed path 12 are radially formed in the radial direction of the ring-shaped member 10. Even if the discharge holes 15 are clogged with foreign matters intruded into the lubricant, and the casting cycle is stopped, the ring-shaped member 10 can be easily removed from the plunger rod 13, thus its maintainability is excellent. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a die casting apparatus, and more particularly to a structure for applying a lubricant in order to ensure lubricity between a plunger sleeve and a plunger tip.

  In die casting, the molten metal is supplied to the inside of the plunger sleeve that communicates with the cavity of the mold, and the molten metal in the plunger sleeve is pushed into the cavity by a plunger tip that slides in the plunger sleeve. The product is being molded. Here, in order to ensure good sliding between the plunger sleeve and the plunger tip, it is usual to apply a lubricant to the inner wall of the plunger sleeve.

  As a method for applying the lubricant to the plunger tip, for example, there is a technique disclosed in Japanese Patent Laid-Open No. 10-166129 (Patent Document 1). The technique disclosed in Patent Document 1 uses a device in which a plunger rod for advancing a plunger tip is provided with a passage for supplying a lubricant and a discharge hole, and the plunger tip is molded into a mold. In the state of being advanced to the cavity side of, the lubricant is applied to the plunger sleeve from the discharge hole formed in the plunger rod, and then the excess lubricant is swept out by the plunger tip when the plunger tip is retracted, The plunger sleeve is discharged from the rear.

More specifically, the following method is disclosed. (1) A route for applying lubricant is provided inside the plunger rod, and the lubricant is applied from a discharge hole formed at a predetermined interval in the plunger rod axial direction. (2) A pipe for applying lubricant is attached to the outer peripheral surface of the plunger rod, and the lubricant is applied from a discharge hole located behind the plunger tip. (3) In the above method (2), the lubricant is applied from the discharge holes formed at predetermined intervals in the axial direction of the pipe for applying lubricant. (4) A route for applying a lubricant is provided inside the plunger rod and the plunger tip, and the lubricant is applied from a discharge hole formed on the plunger rod side of the plunger tip. According to these methods, the lubricant can be applied relatively uniformly in the plunger sleeve.
JP-A-10-166129

  However, according to the method of applying the lubricant as disclosed in Patent Document 1, the following problems occur. First, in the case of the methods (1) and (3), the route for applying the lubricant has one end serving as a discharge hole and the other end connected to a lubricant supply source. Since the distance from the source is different for each discharge hole, the amount of lubricant ejected from each discharge hole tends to vary. That is, the more the lubricant is ejected in the discharge hole closer to the lubricant supply source, the more lubricant is ejected, so the amount of lubricant applied becomes excessive on the side closer to the lubricant supply source, and the side farther from the lubricant supply source. Then, the amount of lubricant applied is insufficient. In the methods (2) and (4), more lubricant can be applied to the inner wall of the sleeve near the discharge hole, but the amount of lubricant applied to the inner wall of the sleeve is insufficient in other portions. . These two problems are particularly prominent when it is desired to reduce the amount of lubricant applied in order to reduce costs and improve product quality. That is, if the absolute amount of the lubricant used in one casting cycle is reduced, the variation in the coating amount becomes larger, which is likely to cause a problem. Therefore, in the case of using a very small amount of lubricant, the technique disclosed in Patent Document 1 is not sufficient to suppress variation in the amount of lubricant applied. Further, when the discharge hole is formed directly on the plunger rod or the plunger tip as in the method (1) or the method (4), the discharge hole is caused by foreign matter (debris) contained in the lubricant, apart from the above two problems. There is also a problem that maintenance is not good when clogged.

  The present invention has been made in view of the current situation as described above, and provides a die casting apparatus capable of evenly applying the lubricant to the inner wall of the plunger sleeve and having excellent maintainability. Is an issue.

  In order to solve the above-described problems, a die casting apparatus of the present invention includes a mold having a cavity surface and a hollow portion, and a plan arranged in the mold so that the hollow portion communicates with the cavity surface. A jar sleeve, a plunger tip that slides in the hollow portion of the plunger sleeve in the axial direction of the plunger sleeve, and pushes molten metal supplied into the hollow portion into a cavity formed by the cavity surface; A plunger rod attached to the side opposite to the cavity surface side of the plunger tip so as to extend in the axial direction of the plunger sleeve, and moving the plunger tip in the axial direction of the plunger sleeve; A ring-shaped member fitted to the outer peripheral surface of the plunger rod, the plunger rod, A lubricant supply path for applying lubricant to the inner wall of the plunger sleeve is formed inside, and the ring-shaped member is a discharge formed in a direction from the inner peripheral surface toward the outer peripheral surface. A plurality of holes are formed in the circumferential direction of the ring-shaped member, and the ring-shaped member is fitted into the outer peripheral surface of the plunger rod so that the discharge hole and the lubricant supply path communicate with each other. It is characterized by.

  In the die casting apparatus of the present invention, the ring-shaped member may have the discharge holes formed radially in the radial direction of the ring-shaped member.

  Furthermore, in the die casting apparatus of the present invention, the ring-shaped member is formed such that at least two of the discharge holes intersect at different angles with respect to the axial direction of the plunger rod. It is good to be.

  According to the configuration of the die casting apparatus of the present invention described above, since the member in which the discharge hole is formed is a ring-shaped member, the plunger rod and the ring-shaped member can be easily divided. Even if the discharge hole of the member is clogged with foreign matter mixed in the lubricant, the casting process can be resumed only by replacing the ring-shaped member. In addition, since the ring-shaped member is smaller than the plunger rod, removing foreign substances clogged in the discharge hole is easier than in the case of the plunger rod, and there is no need to prepare another ring member. However, the casting process can be restarted immediately by removing the foreign matter from the ring-shaped member. Thus, the die casting apparatus of the present invention is excellent in maintainability.

  In the present invention, the ring-shaped member may have a circular outer peripheral surface shape when viewed from the axial direction, but the outer peripheral surface shape may be other shapes. Is also possible. For example, an elliptical shape or other circular shapes can be used.

  Further, since the ring-shaped member has a plurality of discharge holes formed in the direction from the inner peripheral surface of the ring-shaped member toward the outer peripheral surface over the circumferential direction of the ring-shaped member, the ring-shaped member In a state in which is inserted into the outer peripheral surface of the plunger rod, the position of the plunger sleeve in the axial direction can be made substantially the same in the plurality of discharge holes. Therefore, a plurality of discharge holes can be provided so that the distances from the lubricant supply source are substantially constant, and the lubricant can be more evenly applied to the inner wall of the plunger sleeve.

  This effect is particularly remarkable when a very small amount of lubricant is used. That is, in the prior art, when applying a very small amount of lubricant, it was difficult to suppress variation in the amount of coating, but according to the present invention, a very small amount of lubricant is applied to the plunger sleeve. Even when applied to the inner wall, it is possible to suppress variations in the amount of lubricant applied, and consequently to prevent the plunger sleeve from being melted or casting defects in the cast product. The trace amount of lubricant can be exemplified by a case where the amount of lubricant ejected from the entire discharge hole of the plunger rod for each casting cycle is several milliliters, for example. Specifically, the range of 0.5-3 ml and 1-2 ml can be illustrated.

  In addition, examples of the ring-shaped member include a plurality of discharge holes formed radially in the radial direction of the ring-shaped member.

  The number of discharge holes formed in the ring-shaped member is not particularly limited, but it is formed so that a sufficient amount of lubricant is ejected from the discharge holes and can be applied evenly to the inner wall of the plunger sleeve. The number of discharge holes to be set can be set. For example, 2 to 45 discharge holes can be formed along the circumferential direction of the ring-shaped member. More preferably, 4 to 36, 8 to 24, and 9 to 18 ejection holes may be formed. If the number of discharge holes is small, it will be difficult to evenly apply the lubricant to the inner wall of the plunger sleeve.On the other hand, if the number of discharge holes is large, a sufficient amount of lubricant will be ejected from the discharge holes. High supply pressure is required.

  The plurality of discharge holes formed in the ring-shaped member can be formed at predetermined intervals in the circumferential direction of the ring-shaped member. As a result, the lubricant can be more evenly applied to the inner wall of the plunger sleeve. The interval at which the ejection holes are formed depends on the number of ejection holes, but a sufficient amount of lubricant is applied from the ejection holes and the lubricant is applied evenly on the inner wall of the plunger sleeve. Can be set to

  A plurality of discharge holes can be formed in the circumferential direction of the ring-shaped member at every predetermined angle α with the axis of the ring-shaped member as a base point. Specific values of α are 5 °, 6 °, 8 °, 9 °, 10 °, 12 °, 15 °, 18 °, 20 °, 24 °, 30 °, 36 °, 40 °, 45 °. , 60 °, 72 °, 90 °, 120 °, and 180 °. Among these, in particular, 10 °, 12 °, 15 °, 18 °, 20 °, 24 °, 30 °, 36 °, 40 °, 45 °, and 60 ° should be specifically adopted as the value of α. Furthermore, 15 °, 20 °, 24 °, 30 °, 36 °, and 40 ° can be suitably employed as the value of α. In addition, when the outer peripheral surface shape of the ring-shaped member viewed from the axial center direction of the ring-shaped member is circular, if the discharge holes are formed at predetermined angles α with the axial center of the ring-shaped member as a base point as described above, Discharge holes will be formed at predetermined intervals in the circumferential direction of the ring-shaped member, but this is not the case when the outer peripheral surface shape of the ring-shaped member is an ellipse or other circular shape. It is not a thing.

  Furthermore, at least two of the plurality of discharge holes are formed in directions intersecting at different angles with respect to the axial direction of the plunger rod (hereinafter, simply referred to as the axis O direction). The lubricant can be applied over a wide range to the inner wall of the plunger sleeve as well as the position where it is formed and the vicinity thereof. Specifically, “at least two discharge holes among the plurality of discharge holes are formed so as to intersect at different angles with respect to the axial direction (axis O direction) of the plunger rod”, specifically, It shows that. That is, as a first case, when at least one of the discharge holes is formed in a direction orthogonal to the axis O direction, that is, in the radial direction of the plunger sleeve (hereinafter referred to as R direction), the direction from the R direction to the axis O direction. In addition, there can be exemplified a case where at least one discharge hole formed in the direction inclined by the predetermined angle β exists. Further, as a second case, when at least one of the discharge holes is formed in a direction inclined by a predetermined angle βa from the R direction to the axis O direction, in a direction inclined by the predetermined angle βb from the R direction to the axis O direction. A case where at least one discharge hole is formed can be exemplified. Here, the predetermined angle βb is an angle different from the predetermined angle βa. Note that the inclination from the R direction to the axis O direction by a predetermined angle means that the predetermined angle is inclined from the R direction to either the front side or the rear side of the plunger rod. Here, the front side of the plunger rod is the side connected to the plunger tip, and the rear side of the plunger rod is the side opposite to the side connected to the plunger tip.

  When the discharge hole is formed in a direction inclined to the front side or the rear side of the plunger rod from the R direction, an angle β formed by the formation direction in which the discharge hole is formed and the R direction (the predetermined angles β and βa described above). , Corresponding to βb), the value of the lubricant can be appropriately set so that the lubricant is ejected in a wide range from the plurality of discharge holes toward the inner wall of the plunger sleeve. Furthermore, as the maximum value of β, for example, 80 ° can be exemplified, and further, 70 ° and 60 ° can be exemplified. Furthermore, examples of the minimum value of β include 0 °, 10 °, 20 °, and 30 °. Furthermore, when the value of β is changed for each of the plurality of ejection holes, the difference δβ between the minimum value and the maximum value of β can be set to, for example, 10 to 80 °, and further 20 to 70, 30 to 60 °. It can be. If δβ is too small, it is difficult to apply the lubricant over a wide range to the inner wall of the plunger sleeve. On the other hand, if the value of δβ is too large, the amount of lubricant applied from each discharge hole tends to vary, which is not preferable.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing an embodiment of a die casting apparatus of the present invention. Although it is a cross-sectional view, there are some portions that are not hatched in order to give priority to the drawing. The die casting apparatus shown in FIG. 1 has a movable mold 2 attached to a movable platen 1 and a fixed mold 4 attached to a fixed platen 3. Cavity surfaces 2a and 4a are formed on the opposing surfaces of the movable mold 2 and the fixed mold 4, respectively. The movable mold 2 moves toward the fixed mold 4 by the movable platen 1, and the movable mold 2 and the fixed mold 4 are moved. A cavity having a cast product shape is formed by abutting 4 on the mating surface. That is, the movable mold 2 and the fixed mold 4 constitute a mold according to the present invention.

  As shown in FIG. 1, the fixed mold 4 is provided with a plunger sleeve 6 in which a hollow portion 6c communicating with the cavity surface 4a is formed. The plunger sleeve 6 includes a sleeve 6a disposed on the fixed mold 4 side and a sleeve 6b disposed on the fixed platen 3 side. A plunger tip 8 is arranged in the hollow portion 6c of the plunger sleeve 6 so as to slide in the front-rear direction toward the cavity surface 4a along the axial direction of the plunger sleeve 6. In the present embodiment shown in FIG. 1, the forward direction toward the cavity surface 4a refers to the left direction in FIG. 1, and the backward direction toward the cavity surface 4a refers to the right direction in FIG. Further, a plunger rod 13 attached so as to extend in the direction of the axis O of the plunger sleeve 6 is disposed on the side opposite to the cavity surface 4 a side of the plunger tip 8. More specifically, both are arranged so that the axis of the plunger rod 13 is aligned with the axis O of the plunger sleeve 6. Therefore, in the following description, the axis of the plunger rod 13 is also described as the axis O.

  One end of the plunger rod 13 opposite to the plunger tip 8 is connected to a die casting machine (not shown) and is moved back and forth in the axial direction by the die casting machine. As the plunger rod 13 moves back and forth in the axial direction, the plunger tip 8 also moves back and forth toward the cavity surface 4a.

  The plunger sleeve 6 is formed with a hot water supply port 6 d for supplying molten metal into the hollow portion 6 c of the plunger sleeve 6. Die casting is performed by supplying the molten metal from the ladle 5 to the hollow portion 6c through the hot water supply port 6d and pushing the molten metal toward the cavity surface 4a by the plunger tip 8 by the movement of the plunger rod 13 in the axis O direction. be able to.

  A fitting portion 13a is formed on the outer peripheral surface of the plunger rod 13, and the ring-shaped member 10 is fitted to the fitting portion 13a. In addition, although the outer diameter dimension of the ring-shaped member 10 is made into the substantially same outer diameter dimension as the plunger rod 13, it is not restricted to this. Furthermore, a lubricant supply path 12 for applying a lubricant to the inner wall 6 e of the plunger sleeve 6 is formed inside the plunger rod 13. One end of the lubricant supply path 12 is connected to a lubricant supply port 7 formed in the plunger rod 13, and the lubricant supply port 7 is connected to a lubricant supply device (not shown). The other end of the lubricant supply path 12 is connected to a fitting portion 13a of the plunger rod 13, and is exposed to the outer peripheral surface side of the plunger rod 13 at the fitting portion 13a.

  FIG. 2 shows an enlarged view of the vicinity of the ring-shaped member 10 in a state in which the plunger rod 13 is fitted in the fitting portion 13a. 3 is a cross-sectional view taken along the line AA in FIG. In FIG. 2, the axis O direction of the plunger rod 13 is the O direction, and the radial direction of the plunger rod 13 orthogonal to the O direction is the R direction. The ring-shaped member 10 is fitted into the outer peripheral surface of the plunger rod 13 so as to cover the other end of the lubricant supply path 12 exposed on the outer peripheral surface of the plunger rod 13 in the fitting portion 13a. The ring-shaped member 10 is fitted in the same axis as the axis O of the plunger rod 13, and hereinafter, the axis of the ring-shaped member 10 is also referred to as the axis O. The ring-shaped member 10 is fixed in such a manner that it is pressed against the rear side of the plunger rod 13 by a joint 9 that is screwed to the distal end portion of the plunger rod 13 by a male screw portion 9a. The plunger tip 8 is fixed by being screwed into the male screw portion 9 b of the joint 9.

  As shown in FIGS. 2 and 3, a plurality of discharge holes 15 are formed in the ring-shaped member 10 in the circumferential direction of the ring-shaped member 10 in the direction from the inner circumferential side to the outer circumferential side of the ring-shaped member 10. Has been. In particular, in the present embodiment, the plurality of discharge holes 15 are formed radially in the radial direction of the ring-shaped member 10. More specifically, a plurality of discharge holes 15 are formed in the R direction perpendicular to the O direction on the outer peripheral surface of the ring member 10 at every predetermined angle α with the axis O of the ring member 10 as a base point. . In particular, in this embodiment, the ring-shaped member 10 has a circular outer peripheral surface shape (the outer peripheral surface shape of the ring-shaped member 10 shown in FIG. 3) when the ring-shaped member 10 is viewed from the axis O direction. Since the twelve discharge holes 15 are formed along the circumferential direction of the ring-shaped member 10, the predetermined angle α is 30 °.

Further, the plurality of discharge holes 15 formed in the ring-shaped member 10 are formed radially in the radial direction from the inner peripheral surface side to the outer peripheral surface side of the ring-shaped member 10. On the inner peripheral surface, in the axial direction (O direction) of the ring-shaped member 10, a groove portion 10 a is formed along the inner peripheral direction of the ring-shaped member 10 at the same position as the position where the plurality of discharge holes 15 are formed. Is formed. That is, the opening end of the discharge hole 15 on the inner peripheral surface side of the ring-shaped member 10 communicates with the groove portion 10a. On the other hand, a groove 12a is formed along the circumferential direction on the outer peripheral surface of the fitting portion 13a of the plunger rod 13, and the other end of the lubricant supply path 12 is formed in the groove 12a formed in the fitting portion 13a. Is connected, the other end of the lubricant supply path 12 is exposed to the outer peripheral surface side of the plunger rod 13. Further, the groove portion 12a formed in the fitting portion 13a is formed at the same position as the groove portion 10a formed in the ring-shaped member 10 in the O direction, and the ring-shaped member 10 is fitted into the fitting portion 13a. When this occurs, the groove 12a and the groove 10a communicate with each other. That is, in a state where the ring-shaped member 10 is fitted in the plunger rod 13, the lubricant supply path 12 and the discharge hole 15 formed in the ring-shaped member 10 communicate with each other. As a result, the lubricant flowing through the lubricant supply path 12 is ejected from the discharge hole 15 to the outside.

  Further, as shown in FIG. 2, O-rings 14 are disposed as seal members between the joint 9 and the plunger rod 13 on the front side and the rear side in the axis O direction of the ring-shaped member 10. As a result, the lubricant supply path 12 is sealed to the outside except for the discharge holes 15 so that the lubricant does not leak to the outside from other than the discharge holes 15. Thereby, in the lubricant supply port 7, the pressure applied to the lubricant by the pressurized air is transmitted to the discharge hole 15 without loss, and the discharge force of the lubricant from the discharge hole 15 can be sufficiently maintained. it can. Further, if the pressure applied to the lubricant at the lubricant supply port 7 is always kept constant, the discharge force of the lubricant discharged from the discharge hole 15 can be maintained at a substantially constant discharge force. The amount of lubricant applied can be made substantially constant.

  Next, an operation example of the die casting apparatus of the present embodiment will be described. First, in the die casting apparatus shown in FIG. 1, the fixed mold 4 and the movable mold 2 are brought into contact with each other at the mating surfaces, and the cavity surfaces 2a and 4a constitute a cavity. Then, in a state where the molten metal is supplied to the hollow portion 6c, the plunger rod 13 is driven to the front side (left side in FIG. 1) by a die casting machine (not shown), and the molten metal is pushed out to the cavity by the plunger tip 8. Mold castings. The mold is opened and the cast product is taken out. At the time of taking out the cast product, the plunger tip 8 is in the forward end position as shown in FIG.

  Next, in a state where the plunger tip 8 is located at the forward end position, the lubricant is supplied to the lubricant supply path 12 by a predetermined pressure by the pressure supply air from the lubricant supply device connected to the lubricant supply port 7. Supply. As a result, the lubricant flows through the lubricant supply path 12 and the lubricant is ejected from the discharge holes 15 of the ring-shaped member 10 communicating with the lubricant supply path 12. The lubricant ejected from the discharge hole 15 is applied to the inner wall of the plunger sleeve 6. In the die casting apparatus of this embodiment, a plurality of discharge holes 15 are formed radially in the radial direction (R direction) in the ring-shaped member 10, and the distance from each lubricant supply hole 7 to the discharge hole 15 is as follows. Since it is substantially constant, approximately the same amount of lubricant can be applied from each discharge hole 15. Therefore, the lubricant can be uniformly applied to the inner wall of the plunger sleeve 6 along the inner peripheral surface direction. Thereafter, the plunger rod 13 is moved rearward and the plunger tip 8 is moved rearward to slide the outer peripheral surface of the plunger tip 8 and the inner peripheral surface of the plunger sleeve 6. As a result, the lubricant applied to the inner peripheral surface of the plunger sleeve 6 is dispersed in the direction of the axis O of the plunger sleeve 6 by the outer peripheral surface of the plunger tip 8. The lubricant can be applied evenly in the O direction.

  Note that the lubricant 15 may be ejected from the discharge hole 15 while moving the plunger tip 8 backward. Further, when the plunger tip 8 is moved backward, the lubricant may be intermittently ejected from the discharge hole 15. According to these methods, the lubricant can be evenly applied even in the axial direction of the plunger sleeve 6.

  When the process of applying the lubricant to the inner peripheral surface of the plunger sleeve 6 is completed, the plunger tip 8 is moved rearward from the position where the hot water inlet 6d of the plunger sleeve 6 is formed. This position is defined as a backward end position of the plunger tip 8. Then, in the state where the plunger tip 8 is located at the reverse end position, the molten metal is supplied from the hot water supply port 6d into the hollow portion 6c of the plunger sleeve 6, and the plunger tip 8 is moved forward as in the previous cycle. The casting process of the next cycle is performed by moving.

  In the die casting apparatus of the present embodiment as described above, since the lubricant can be uniformly applied to the inner peripheral surface of the plunger sleeve 6, excess or deficiency of the lubricant applied to the inner wall 6 e of the plunger sleeve 6. Can be suppressed. Therefore, when the casting process of the next cycle is performed, the plunger tip 8 melts due to lack of lubricant, or the lubricant in the plunger sleeve 6 enters the cavity due to excessive lubricant, and defects are formed in the cast product. Can be suppressed.

  Further, since the discharge hole 15 for applying the lubricant to the inner peripheral surface of the plunger sleeve 6 is formed in the ring-shaped member 10, even if foreign matter mixed into the lubricant is clogged in the discharge hole 15. Since the ring-shaped member 10 can be easily detached from the plunger rod 13, it is excellent in maintainability. That is, by removing the ring-shaped member 10 and fitting another ring-shaped member 10, continuous casting can be resumed without interrupting continuous casting (a process in which a series of casting cycles are continuously performed) for a long time. can do. Further, the ring-shaped member 10 is smaller than the plunger rod 13 and can easily remove foreign substances clogged in the discharge holes 15. Therefore, even if the ring-shaped member 10 is not replaced as described above, after the ring-shaped member 10 is removed and the foreign matter is removed, the ring-shaped member 10 can be fitted into the plunger rod 13 again and used. It is excellent in maintainability.

  Next, a second embodiment of the present invention will be described. The second embodiment of the present invention differs from the above-described die casting apparatus according to the first embodiment in that a ring-shaped member 30 as shown in FIG. Hereinafter, the ring-shaped member 30 will be described. Similar to the ring-shaped member 10, a plurality of discharge holes 32 are formed in the ring-shaped member 30 along the circumferential direction in the direction from the inner peripheral surface side to the outer peripheral surface side of the ring-shaped member 30. However, the formation direction of the discharge hole 32 in which at least one of the discharge holes 32 extends is the radial direction of the ring-shaped member 30 (direction orthogonal to the axis O direction of the plunger rod 13: R direction). Is different from the ring-shaped member 10 in that the plunger rod 13 is inclined at a predetermined angle forward or rearward in the axis O direction of the plunger rod 13. Here, the formation direction of the discharge holes 32 is a direction indicated by dotted lines P and Q in FIG. Specifically, in FIG. 4, the formation direction of the discharge hole 32 positioned at the upper end of the ring-shaped member 30 is inclined by a predetermined angle β1 from the R direction to the front side, while being positioned at the lower end of the ring-shaped member 30. The formation direction of the discharge holes 32 is inclined by a predetermined angle β2 from the R direction to the rear side. In FIG. 4, since the ring-shaped member 30 is viewed in a cross section including the axis O of the ring-shaped member, the other discharge holes 32 are not illustrated, but the other discharge holes 32 are not illustrated. Similarly to the ring-shaped member 10 shown in FIG. 3, it is formed for each predetermined angle α along the circumferential direction. The angle β formed between the formation direction of each discharge hole 32 and the radial direction (R direction) of the ring-shaped member 30 is set to various values for each discharge hole 32. For example, in the discharge holes 32 adjacent to each other in the circumferential direction, those that are inclined forward and those that are inclined backward with respect to the radial direction of the ring-shaped member 30 are exemplified. be able to.

  Furthermore, in 2nd Embodiment of this invention, the ring-shaped member 40 as shown in FIG. 5, FIG. 6 is also employable. FIG. 5 is a schematic view of the ring-shaped member 40 as viewed from the direction of the axis O of the ring-shaped member. In FIG. 5, discharge holes 45 are formed at positions indicated by a, b, and c. The plurality of discharge holes 45 are formed every 20 ° in the circumferential direction with the axis O of the ring-shaped member 40 as a base point. Since the ring-shaped member 40 has a circular outer peripheral surface viewed from the direction of the axis O, the ring-shaped member 40 has 18 discharge holes 45 formed therein.

  6 shows an aO sectional view, a bO sectional view, and a cO sectional view of FIG. 6A is an aO cross-sectional view, FIG. 6B is a bO cross-sectional view, and FIG. 6C is a cO cross-sectional view. That is, FIG. 6A shows the formation direction of the discharge hole 45 at the position a, and FIG. 6B shows the formation direction of the discharge hole 45 at the position b. Indicates the formation direction of the discharge hole 45 at the position c. As shown in FIG. 6, a groove 40 a is formed in the ring-shaped member 40 in the same manner as the ring-shaped members 10 and 30 described above. And the discharge hole 45 is formed so that it may connect with this groove part 40a. As shown in FIG. 6A, the discharge hole 45 is formed in parallel with the radial direction (aO direction) of the ring-shaped member 40 at the position “a” in FIG. 5. On the other hand, as shown in FIG. 6B, at the position b in FIG. 5, the discharge hole 45 extends from the radial direction (bO direction) of the ring-shaped member 40 to the front side in the axis O direction of the ring-shaped member 40 ( It is formed in a direction inclined by a predetermined angle β3 toward the left in FIG. Further, as shown in FIG. 6C, at the position c in FIG. 5, the discharge hole 45 extends from the radial direction (cO direction) of the ring-shaped member 40 toward the axial direction of the ring-shaped member 40. It is formed in a direction inclined by a predetermined angle β4. Here, β3 and β4 are different angles, and β3 <β4. Specifically, β3 = 30 ° and β4 = 60 °.

  In the ring-shaped member 40 shown in FIGS. 5 and 6, all the forming directions of the discharge holes 45 are inclined forward from the radial direction of the ring-shaped member 40 in the axis O direction. You may form the discharge hole 45 which a direction inclines in the axis | shaft O direction back side (right direction of FIG. 6) from the radial direction of the ring-shaped member 40. FIG.

  Note that the die casting apparatus according to the second embodiment using the ring-shaped members 30 and 40 as described above operates in substantially the same manner as the die casting apparatus of the first embodiment. That is, only the lubricant discharge direction when the lubricant is ejected from the discharge hole 45 is different from that of the first embodiment. By using the ring-shaped members 30 and 40, the lubricant is applied over a wide range in the direction of the axis O to the inner wall 6e of the plunger sleeve 6 of FIG.

  As described above, in the second embodiment of the present invention, the lubricant ejected from the discharge holes 32 and 45 of the ring-shaped members 30 and 40 has a wide range in the axis O direction on the inner peripheral surface of the plunger sleeve 6 shown in FIG. Since the distance between each discharge hole 45 and the lubricant supply port 7 is substantially the same as in the first embodiment, the lubricant is applied over a wide range in the direction of the axis O of the plunger sleeve 6. Even if it is applied, variation in the amount of lubricant applied in the direction of the axis O is suppressed. Therefore, for example, even when a very small amount of lubricant is applied to the inner peripheral surface of the plunger sleeve 6, the lubricant can be uniformly applied to the inner peripheral surface of the plunger sleeve 6. Therefore, there is no excess or deficiency in the amount of lubricant applied to the inner peripheral surface of the plunger sleeve 6, and problems such as melting of the plunger tip 8 and casting defects can be prevented.

  As mentioned above, although embodiment of this invention was described, this invention is not restricted to this, Unless the summary of this invention is changed, the shape of the discharge holes 15, 32, 45, and the shape of the lubricant supply path | route 12 It is also possible to change these appropriately. For example, the inner diameter of the discharge holes 15, 32, 45 is finely adjusted for each of the plurality of discharge holes 15, 32, 45 to further reduce variation in the amount of lubricant ejected from each of the discharge holes 15, 32, 45. You can also.

  In the present embodiment, the ring-shaped members 10, 30 and 40 are fixed to the plunger rod 13 by the joint 9, but the outer peripheral surface shape of the fitting portion 13 a of the plunger rod 13 is a male screw shape, and the ring The ring-shaped member may be fixed by screwing the ring-shaped member into the plunger rod 13 with the inner peripheral surface shape of the ring-shaped member being a female screw shape. In this case, the joint 9 is not always necessary. For example, a male screw part is formed on the outer peripheral surface of the plunger rod 13 further forward than the fitting part 13a (the tip end side of the plunger rod 13), and the plunger tip 8 is inserted into the plunger rod 13 via the male screw part. May be directly connected.

Sectional drawing which shows an example of the die-casting apparatus of this invention. Sectional drawing which shows one form of the ring-shaped member concerning this invention. AA sectional drawing of the ring-shaped member of FIG. Sectional drawing which shows the form different from FIG. 2 of the ring-shaped member concerning this invention. Sectional drawing which shows the form different from FIG. 2 thru | or 4 of the ring-shaped member concerning this invention. Sectional drawing which shows the formation direction of the discharge hole of the ring-shaped member shown in FIG.

Explanation of symbols

2 Movable type (mold)
4 Fixed mold (mold)
2a, 4a Cavity surface 6 Plunger sleeve 6c Hollow portion of plunger sleeve 6e Inner wall of plunger sleeve 8 Plunger tip 10 Ring-shaped member 12 Lubricant supply path 13 Plunger rod 13a Fitting portion 15 Discharge hole O Plunger sleeve Shaft, plunger rod shaft, ring-shaped member shaft

Claims (2)

A mold having a cavity surface;
A plunger sleeve that has a hollow portion and is disposed in the mold such that the hollow portion communicates with the cavity surface;
A plunger tip that slides in the hollow portion of the plunger sleeve in the axial direction of the plunger sleeve and pushes the molten metal supplied into the hollow portion into a cavity formed by the cavity surface;
A plunger rod attached to the side opposite to the cavity surface side of the plunger tip so as to extend in the axial direction of the plunger sleeve, and moving the plunger tip in the axial direction of the plunger sleeve;
A ring-shaped member fitted on the outer peripheral surface of the plunger rod,
In the plunger rod, a lubricant supply path for applying a lubricant to the inner wall of the plunger sleeve is formed inside, and the ring-shaped member is directed from the inner peripheral surface to the outer peripheral surface. A plurality of discharge holes formed in the direction are formed in the circumferential direction of the ring-shaped member, and the ring-shaped member is connected to the plunger rod so that the discharge hole and the lubricant supply path communicate with each other. A die casting apparatus characterized by being fitted to the outer peripheral surface of the die casting. 2. The ring-shaped member according to claim 1, wherein at least two of the discharge holes are formed in directions intersecting at different angles with respect to an axial direction of the plunger rod. Die casting equipment.

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