Casting equipment

Abstract

To provide a casting device provided with a sliding pin having a long life and a simple shape that is easy to process.SOLUTION: A casting device 1 includes: a mold 2 that forms a cavity 20; a cylindrical bush 3 attached to the mold 2; and a sliding pin 4 movably inserted into a guide hole 31 formed in the bush 3. The bush 3 has a lubricant supply channel 50 that supplies a lubricant to the guide hole 31. A plurality of grooves 44 connected to the lubricant supply channel 50 are extended on an outer circumferential surface 4a of the sliding pin 4.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a casting device.

Background Art

[0002] FIG. 5 is a diagram showing a conventional casting device 100, and is a main part perspective view showing a state when a lubricant is applied by spraying to the tip portion 410 of the sliding pin 400. As shown in FIG. 5, generally, in the casting device 100, in order to secondarily pressurize the molten metal injected into the cavity of the mold to compensate for insufficient molding pressure, a sliding pin 400 for pressurization is provided to be movable forward and backward via a bush 300 in the mold.

[0003] The bush 300 is composed of a cylindrical body having a guide hole 310 for inserting and arranging the sliding pin 400 and a flange portion 320 formed at the rear end portion of the bush 300. The front end surface 330 of the bush 300 is installed flush with the cavity surface (not shown).

[0004] The sliding pin 400 is a pressurizing pin for performing secondary pressurization in the cavity by pushing it into the bush 300 when the molten metal is in a state where it is half melted after supplying the molten metal into the cavity. A gap S100 is formed between the guide hole 310 and the outer peripheral surface 420 of the sliding pin 400 in order to enable the sliding pin 400 to move forward and backward.

[0005] When the opening end portion of the guide hole 310 is expanded in a trumpet shape or the like to increase the gap S100 to prevent the biting (jamming) of the sliding pin 400, the molten metal enters the gap S100, so the gap S100 must be formed small. For this reason, when the sliding pin 400 is moved forward and backward, problems such as biting occur, and the life is short.

[0006] Furthermore, the sliding pin 400 is inserted into the cavity with its tip 410, and then removed after the molten metal inside the cavity has solidified. As a result, when retracting the sliding pin 400, there were problems such as molten metal being drawn into the bush 300, or molten metal adhering to the sliding pin 400 getting caught on the bush 300.

[0007] To resolve this issue and allow the sliding pin 400 to smoothly exit the bush 300, a spray 200 is used to apply a release agent 500 (lubricant) towards the gap S100.

[0008] When using spray 200, first, release agent 500 is sprayed into the mold and bush 300 to provide a release effect. Then, the sliding pin 400 is inserted into the bush 300 and advanced to the cavity. In this state, spray 200 is applied by spraying the release agent 500 towards the gap S100 in a circular motion along the gap S100 for 3 to 6 seconds, thereby improving the cooling and lubrication of the sliding pin 400.

[0009] However, even when using such spray 200, although it had a release effect, the sliding pin 400 still suffered from problems such as insufficient lubrication, galling due to molten metal adhesion, and malfunction.

[0010] As an example of an improved sliding pin mechanism, a die-casting apparatus described in Patent Document 1 is known. In the die-casting apparatus described in Patent Document 1, a fluid gap (8) is created by forming a groove on the inner surface of the pressure pin guide (7), and a liquid that acts as a lubricant is supplied to the fluid gap (8) to cool the pressure pin (6) and prevent seizing. [Prior art documents] [Patent Documents]

[0011] [Patent Document 1] Japanese Utility Model Publication No. 4-83459 [Overview of the Initiative] [Problems that the invention aims to solve]

[0012] The conventional casting apparatus 100 shown in Figure 5 has the problem that even if the release agent 500 is sprayed into the gap S100 with the spray 200, it cannot be spread over the entire outer circumference of the sliding pin 400, resulting in poor sliding performance and a short lifespan for the sliding pin 400. In addition, the spray 200 has the problem that it is time-consuming and inefficient to apply the release agent 500 to the outer surface 420 of the sliding pin 400.

[0013] Furthermore, the die-casting apparatus described in Patent Document 1 has the problem that it is difficult to form grooves because it provides a fluid gap (8) by forming multiple grooves on the inner surface of the pressure pin guide (7).

[0014] Therefore, the present invention was made to solve the aforementioned problems, and aims to provide a casting apparatus equipped with a sliding pin that has a long lifespan and a simple shape that is easy to process. [Means for solving the problem]

[0015] To solve the aforementioned problems, the casting apparatus according to the present invention comprises a mold for forming a cavity, A cylindrical bush attached to the mold, and a guide hole formed in the bush that moves The bush comprises a retractably inserted sliding pin, and the bush supplies lubricant into the guide hole. It has a lubricant supply passage, and the outer surface of the sliding pin has multiple connections communicating with the lubricant supply passage. A number of grooves were extended. The sliding pin has a large-diameter portion provided on the tip side of the sliding pin and sliding on the inner circumferential surface of the guide hole, and a small-diameter portion provided on the base side of the large-diameter portion and formed to be smaller in diameter than the large-diameter portion, the plurality of grooves provided on the small-diameter side of the outer circumferential surface of the large-diameter portion, the plurality of grooves communicating with the lubricant supply passage via an annular lubricant storage chamber formed on the outer circumferential side of the small-diameter portion, the guide hole has a first support portion formed on the base side of the lubricant storage chamber and supporting the large-diameter portion provided on the base side of the sliding pin, and a second support portion formed on the tip side of the lubricant storage chamber and supporting the large-diameter portion provided on the tip side of the sliding pin, the first support portion and the second support portion are formed to suppress the leakage of lubricant stored in the lubricant storage chamber from the lubricant storage chamber. . Furthermore, the casting apparatus according to the present invention comprises a mold for forming a cavity, a cylindrical bush attached to the mold, and a sliding pin inserted so as to be able to move back and forth in a guide hole formed in the bush, wherein the bush has a lubricant supply passage for supplying lubricant into the guide hole, and a plurality of grooves extending from the outer circumferential surface of the sliding pin communicating with the lubricant supply passage, wherein the sliding pin has a large diameter portion provided on the tip side of the sliding pin and sliding on the inner circumferential surface of the guide hole, and a small diameter portion provided on the base end side of the large diameter portion and formed to be smaller in diameter than the large diameter portion, wherein the plurality of grooves are provided on the side of the outer circumferential surface of the large diameter portion that is on the side of the small diameter portion, and the plurality of grooves are provided on the outer circumferential surface of the small diameter portion The guide hole communicates with the lubricant supply passage via a formed annular lubricant storage chamber, and the tip side of the guide hole is provided with an enlarged diameter portion that widens towards the tip, and when the sliding pin advances and the large diameter portion is positioned within the enlarged diameter portion, the tip end of the groove is exposed to the enlarged diameter portion, and the guide hole has a first support portion formed on the base end side of the lubricant storage chamber and supporting the large diameter portion provided on the base end side of the sliding pin, and a second support portion formed on the tip side of the lubricant storage chamber and supporting the large diameter portion provided on the tip side of the sliding pin, and the first support portion and the second support portion are formed to suppress the leakage of lubricant stored in the lubricant storage chamber from the lubricant storage chamber. [Effects of the Invention]

[0016] The present invention can provide a casting apparatus equipped with a sliding pin that has a long lifespan and a simple shape that is easy to process. [Brief explanation of the drawing]

[0017] [Figure 1] It is a schematic longitudinal sectional view of the main part showing a casting apparatus according to an embodiment of the present invention. [Figure 2] It is a view schematically showing a casting apparatus according to an embodiment of the present invention, and is a perspective view of the main part showing the state when the sliding pin is retracted. [Figure 3] It is a view schematically showing a casting apparatus according to an embodiment of the present invention, and is a perspective view of the main part showing the state when the sliding pin is advanced to supply a lubricant. [Figure 4] It is a perspective view of the sliding pin. [Figure 5] It is a view showing a conventional casting apparatus, and is a perspective view of the main part showing the state when a lubricant is applied by spraying to the tip of the sliding pin.

Mode for Carrying Out the Invention

[0018] Referring to FIGS. 1 to 4, the casting apparatus 1 according to an embodiment of the present invention will be described. In the embodiment of the present invention, the case where the sliding pin 4 moves in the front-rear direction (tip direction and base end direction) will be described as an example, and for convenience, the vertical and horizontal directions in the drawings will be described as the vertical and front-rear directions.

[0019] ≪Casting Apparatus≫ As shown in FIG. 1, the casting apparatus 1 is an apparatus for forming a casting by pouring molten metal into a cavity 20 formed between a fixed mold 21 of a mold 2 and a movable mold (not shown) and cooling it. The casting apparatus 1 fills the cavity 20 with molten metal and pressurizes it, and further, after casting the casting by applying secondary pressure with the sliding pin 4, an extrusion pin (not shown) slidably inserted into the mold 2 is projected into the cavity 20 to release the casting from the mold.

[0020] The casting apparatus 1 mainly includes a mold 2, a bush 3 attached to the mold 2, a sliding pin 4 provided in the bush 3 so as to be able to advance and retreat, and a lubrication device 5 for supplying a lubricant between the bush 3 and the sliding pin 4.

[0021] The casting apparatus 1 may be a horizontal type apparatus in which the movable mold (not shown) moves laterally, or a vertical type apparatus in which the movable mold (not shown) moves up and down. Below, a horizontal type casting apparatus 1 will be described as an example. The bush 3, sliding pin 4, and lubrication device 5 may be installed on the movable mold or fixed mold 21 of the mold 2, and below, the case in which they are installed on the fixed mold 21 will be used as an example.

[0022] ≪Molds≫ As shown in Figure 1, the mold 2 is for forming the cavity 20. The mold 2 is a casting mold mainly comprising a movable mold (not shown) and a fixed mold 21 positioned opposite the movable mold (not shown). The mold 2 may be horizontally split into multiple surfaces, and its shape, structure, etc., are not particularly limited. During casting, molten metal such as aluminum alloy, magnesium alloy, or zinc alloy is supplied to the cavity 20 in the mold 2 from a holding furnace (not shown) or the like, positioned in front of the mold 2. A bushing installation hole 2b for inserting a bushing 3 is formed in the cavity surface 2a of the mold 2.

[0023] <Cavity> The cavity 20 comprises a product molding section for forming a product, a gate section connected to the product molding section, and a non-product molding section connected to the gate section. Molten metal is poured into the cavity 20 from an injection machine (not shown) via the non-product molding section and the gate section. A release agent is applied to the cavity surface 2a of the cavity 20 before casting.

[0024] <Movable type> The movable mold (not shown) consists of a mold that can move forward and backward relative to the fixed mold 21 by a forward / backward mechanism (not shown) provided in the die-casting machine (not shown). The movable mold (not shown) has a core for forming the front half of the molded product and a cavity surface 2a formed therein.

[0025] <Fixed type> As shown in Figure 1, the fixed mold 21 consists of a rear mold fixed to a die plate (not shown). The fixed mold 21 has a fixed mold side cavity for forming the rear half of the molded product. On the rear surface of the movable mold (not shown) and the rear surface of the fixed mold 21, a positioning key (not shown) for alignment and a recess (not shown) that engages with this positioning key to automatically align the positions of the movable mold (not shown) and the fixed mold 21 are arranged opposite each other. The fixed mold 21 has a mold flow path 22 which forms part of a lubricant supply passage 50 for supplying lubricant.

[0026] ≪Bush≫ As shown in Figure 1, the bush 3 is a component for inserting the sliding pin 4 so that it can move back and forth. The bush 3 consists of a cylindrical body with its tip 3a mounted flush with the cavity surface 2a of the mold 2. The bush 3 has a guide hole 31, a cylindrical portion 32, a flange portion 33, and a lubricant supply passage 50 (a vertical passage 34, a horizontal passage 35, and a lubricant storage chamber 52).

[0027] <Guide hole> The guide hole 31 is a through-hole that allows the sliding pin 4 to move back and forth and also forms a lubricant supply passage 50 for supplying lubricating oil into the guide hole 31. The guide hole 31 has a small hole portion 31a on the base end side, a large hole portion 31b, an enlarged diameter portion 31c, a first support portion 31d, a second support portion 31e, and a small hole portion 31f on the tip end side. The guide hole 31 is formed along the axis line O1. Here, "tip side" refers to the side of the sliding pin 4 located within the bush 3 on which the cavity 20 is formed. "Base side" refers to the side of the sliding pin 4 opposite to the side on which the cavity 20 is formed (the back side).

[0028] <Small hole on the base end> The small hole 31a on the base end is the portion into which the large-diameter portion 42 on the base end of the sliding pin 4 is inserted so as to be able to move back and forth. The small hole 31a on the base end is formed in a cylindrical shape at the base end (rear end) of the bush 3. The inner diameter of the small hole 31a on the base end is formed to be approximately the same length as the outer diameter of the large-diameter portion 42 of the sliding pin 4, so as to prevent the lubricating oil stored in the lubricant reservoir chamber 52 from leaking out. For this reason, the small hole 31a on the base end functions as a first support portion 31d that supports the large-diameter portion 42 of the sliding pin 4.

[0029] <Large hole> The large hole 31b is the portion into which the small-diameter portion 41, formed in the center of the sliding pin 4, is inserted so as to be able to move back and forth. The large hole 31b is formed in a cylindrical shape in the center of the bush 3, between the small hole 31a and the enlarged diameter portion 31c. The inner diameter of the large hole 31b is larger than the outer diameter of the small-diameter portion 41, the inner diameter of the small hole 31a (first support portion 31d), and the inner diameter of the second support portion 31e. For this reason, a lubricant storage chamber 52 for storing lubricant is formed between the large hole 31b and the small-diameter portion 41.

[0030] Furthermore, as will be described later, if a small-diameter portion 41 is formed on the sliding pin 4, the lubricant reservoir 52 can be formed using only the small-diameter portion 41, and therefore the large hole portion 31b may be omitted.

[0031] <Expanded diameter part> As shown in Figures 2 and 3, the enlarged diameter portion 31c is the portion into which the large diameter portion 43 at the tip of the sliding pin 4 is inserted so as to be able to move back and forth. The enlarged diameter portion 31c is tapered (trumpet-shaped) as it widens from the second support portion 31e (small hole portion 31f at the tip) formed at the tip (front end) of the large hole portion 31b toward the opening end of the guide hole 31. For this reason, the enlarged diameter portion 31c is in communication with the cavity 20. At the tip of the guide hole 31, when the sliding pin 4 advances and the large diameter portion 43 is positioned within the enlarged diameter portion 31c, the tip end of the groove 44 is exposed in the enlarged diameter portion 31c.

[0032] <1st support part> The first support portion 31d is a part that supports the large-diameter portion 42 at the base end of the sliding pin 4 so that it can move back and forth. The first support portion 31d consists of a cylindrical small hole portion 31a at the base end formed on the base end side of the lubricant reservoir chamber 52. Therefore, the first support portion 31d is formed to support the large-diameter portion 42 of the sliding pin 4 without any looseness.

[0033] <Second support section and small hole at the tip> The second support portion 31e is a part that supports the large-diameter portion 42 at the tip of the sliding pin 4 so that it can move back and forth. The second support portion 31e consists of a cylindrical small hole portion 31f at the tip, formed between the rear end (base end) of the enlarged diameter portion 31c and the front end (tip) of the lubricant reservoir chamber 52. The second support portion 31e (small hole portion 31f at the tip) is formed with an inner diameter that allows the large-diameter portion 42 at the tip of the sliding pin 4 to move back and forth in close contact, thereby supporting the large-diameter portion 43 of the sliding pin 4 without any looseness.

[0034] The second support portion 31e (the small hole portion 31f at the tip) is formed in the same way as the first support portion 31d and the small hole portion 31a at the base end, to prevent the lubricant stored in the lubricant storage chamber 52 from leaking out of the lubricant storage chamber 52. Therefore, even if an enlarged diameter portion 31c is formed at the tip of the guide hole 31, the second support portion 31e is able to prevent a large amount of molten metal in the cavity 20 from entering the lubricant storage chamber 52.

[0035] Furthermore, as shown in Figure 3, when lubricant is supplied to the lubricant reservoir 52 and groove 44 with the sliding pin 4 advanced, the lubricant is applied to the inner surface of the second support portion 31e (the small hole portion 31f at the tip) from the groove 44. Then, as shown in Figure 2, when the sliding pin 4 is retracted, the lubricant applied to the inner surface of the second support portion 31e (the small hole portion 31f at the tip) is evenly applied to the tip side of the large diameter portion 43 (the part where the groove 44 is not formed).

[0036] <Cylindrical section and flange section> As shown in Figure 1, the cylindrical portion 32 is a cylindrically formed part. The flange portion 33 is a thick, disc-shaped part formed at the rear end of the cylindrical portion 32. The flange portion 33 is provided with a vertical passage 34 connected to the lubricant supply device 51 via a mold passage 22 and a discharge passage 53, and a horizontal passage 35 connected to the lubricant supply device 51 via a lubricant supply passage 50.

[0037] <Longitudinal channel and discharge channel> The vertical passage 34, the mold passage 22, and the discharge passage 53 are passages for discharging the lubricant in the lubricant storage chamber 52 to the lubricant supply passage 50 (see Figure 1) when the sliding pin 4 is moved from the forward position shown in Figure 3 to the retracted position shown in Figure 2.

[0038] <Horizontal channel> The lateral passage 35, lubricant supply passage 50, and lubricant storage chamber 52 are lubricant supply passages for supplying lubricant into the bush 3 to improve the sliding performance of the sliding pin 4. The lubricant storage chamber 52 is formed with a larger diameter than the large diameter section 43 by the large hole section 31b. Therefore, as shown in Figure 2, when the sliding pin 4 retracts, lubricant can be reliably supplied into the groove 44.

[0039] ≪Sliding Pin≫ As shown in Figure 1, the sliding pin 4 is a component for secondary pressurizing the cavity 20, for example, by manually pushing it into the guide hole 31 of the bush 3. The sliding pin 4 consists of a stepped round bar that is inserted so as to be able to move back and forth into the guide hole 31 formed along the axis O1 of the bush 3. The outer circumferential surface 4a of the sliding pin 4 has a small diameter portion 41, large diameter portions 42, 43, and a plurality of grooves 44. With this configuration, the small diameter portion 41, the large diameter portions 42, 43, and the plurality of grooves 44 have a simple shape formed on the outer circumferential surface 4a of the sliding pin 4, so it can be easily manufactured by machining the outer circumferential surface 4a of a round bar member.

[0040] <Small diameter section> The small-diameter portion 41 is a part formed with a smaller diameter than the large-diameter portions 42 and 43. The small-diameter portion 41 consists of a cylindrical portion recessed in a stepped manner between the large-diameter portion 42 at the base end and the large-diameter portion 43 at the tip end. Therefore, a cylindrical space is formed in cross-section between the outer circumferential surface 4a of the small-diameter portion 41 of the sliding pin 4 and the large hole 31b of the guide hole 31 of the bush 3 which is positioned opposite the small-diameter portion 41, forming a lubricant storage chamber 52 for storing lubricant.

[0041] <Large diameter section> The large-diameter portions 42 and 43 are parts whose outer diameter is larger than that of the small-diameter portion 41. The large-diameter portions 42 and 43 are formed on the base end side and the tip end side of the small-diameter portion 41, respectively. The large-diameter portion 42 at the base end is formed at the base end of the small-diameter portion 41 of the sliding pin 4, is inserted into the small hole portion 31a of the bush 3 so as to be able to move back and forth, and is supported by the first support portion 31d. The large-diameter portion 43 at the tip is formed at the tip of the small-diameter portion 41 of the sliding pin 4, is slidably inserted into the enlarged diameter portion 31c (guide hole 31) of the bush 3, and is supported by the second support portion 31e.

[0042] <groove> As shown in Figures 1 to 4, the grooves 44 are lubricant supply passages that form part of a lubricant supply passage 50 for supplying lubricant stored in the lubricant storage chamber 52 to the outer circumferential surface 4a of the large-diameter portion 43 at the tip end. The multiple grooves 44 are formed in communication with the lubricant storage chamber 52 at the small-diameter portion 41 side of the large-diameter portion 43 at the tip end, and consist of numerous grooves that extend diagonally forward from the front end (small-diameter portion 41) of the lubricant storage chamber 52 in parallel at appropriate intervals. The grooves 44 are formed so that the lubricant in the lubricant storage chamber 52 is evenly distributed throughout the entire circumferential space between the outer circumferential surface 4a of the large-diameter portion 43 of the sliding pin 4 and the inner circumferential surface of the second support portion 31e (small hole portion 31f at the tip end) of the bush 3. In other words, the multiple grooves 44 are formed diagonally with respect to the axis line O1 direction, parallel at appropriate intervals, and are arranged in an overlapping state when viewed from the axial direction.

[0043] <Lubricant> The lubricant is intended to lubricate the space between the inner circumferential surface of the guide hole 31 of the bush 3 and the outer circumferential surface 4a of the sliding pin 4, thereby facilitating the sliding pin 4's movement. The lubricant consists of, for example, a liquid lubricant such as an oily mist or a water-soluble mist, or a powder lubricant. The lubricant also functions as a release agent to allow the sliding pin 4, which has been pushed into the bush 3, to smoothly detach from the bush 3 when the molten metal injected into the cavity 20 is not yet fully solidified.

[0044] ≪Lubrication device≫ The lubrication device 5 shown in Figure 1 is a device that improves the sliding performance of the sliding pin 4 and extends its lifespan by supplying lubricant to a lubricant storage chamber 52 formed between the inner circumferential surface of the bush 3 and the outer circumferential surface 4a of the sliding pin 4. The lubrication device 5 comprises a lubricant supply device 51, a lubricant supply passage 50, a lubricant storage chamber 52, and a discharge passage 53.

[0045] <Lubricant supply device> The lubricant supply device 51 is a device for sending the lubricant stored in the lubricant supply device 51 from the lubricant supply passage 50 to the lubricant storage chamber 52. The lubricant supply device 51 is configured, for example, with a tank for storing lubricant and a pump for ejecting the lubricant from the tank.

[0046] <Lubricant supply channel> The lubricant supply passage 50 is a passage for sending lubricant supplied from the lubricant supply device 51 to the lubricant storage chamber 52. One end of the lubricant supply passage 50 is connected to the lubricant supply device 51, and the other end is connected to the lubricant storage chamber 52 via the horizontal passage 35 and the vertical passage 34, thus communicating with the lubricant storage chamber 52.

[0047] <Lubricant storage chamber> The lubricant storage chamber 52 is a lubricant storage space that temporarily stores the lubricant supplied from the lubrication device 5 to improve the sliding properties of the sliding pin 4. As shown in Figure 2, the lubrication device 5 sends lubricant into the enlarged diameter portion 31c by moving the sliding pin 4, whose groove 44 is located in the lubricant storage chamber 52, forward as shown in Figure 3, thereby achieving the same effect as applying a release agent to the enlarged diameter portion 31c. For this reason, the lubrication device 5 can eliminate the need for the conventionally used spray 200 (see Figure 5).

[0048] ≪Effect≫ Next, the operation of the casting apparatus 1 according to an embodiment of the present invention will be described in order of the casting process with reference to Figures 1 to 4.

[0049] First, as shown in Figure 1, a release agent is applied to the cavity surface 2a of the mold 2, the tip 3a of the bush 3, and the inner surface of the guide hole 31. Next, the movable mold (not shown) is set into the fixed mold 21 and the mold is closed. This forms a cavity 20 inside the mold 2.

[0050] Next, after preheating the mold 2, the air inside the cavity 20 is sucked out by a depressurizing device (not shown) to reduce the pressure and create a negative pressure state inside the cavity 20. Then, molten metal from the holding furnace (not shown) is supplied to the mold 2 to fill the cavity 20. Subsequently, the cavity 20 is pressurized by a pressurizing device (not shown). Furthermore, the sliding pin 4, which is in the retracted position shown in Figures 1 and 2, is pushed forward by hand as shown in Figure 3 to create secondary pressurization inside the cavity 20 and prevent the formation of voids inside the molten metal.

[0051] At this time, as shown in Figure 3, the tip surface 4b of the sliding pin 4 is at the position of the tip 3a of the bush 3. In this state, lubricant in the lubricant supply device 51 (see Figure 1) is supplied from the lubricant supply passage 50 (see Figure 1) to the lubricant storage chamber 52 in the bush 3. The lubricant sent into the lubricant storage chamber 52 passes through the groove 44 to lubricate and cool the outer circumferential surface 4a of the large diameter portion 43 and the inner surface of the second support portion 31e (the small hole portion 31f on the tip side).

[0052] The groove 44 consists of numerous grooves formed at appropriate intervals and at an angle to the front. Therefore, by retracting the sliding pin 4 as shown in Figure 2, the inner surfaces of the first support portion 31d and the second support portion 31e, and the outer circumferential surface 4a of the large diameter portion 43 can be evenly lubricated. As a result, the lifespan of the sliding pin 4 and the bush 3 can be extended compared to when lubrication is performed with spray 200 (see Figure 5).

[0053] Next, after the molten metal and mold 2 reach the desired temperature, the movable mold (not shown) is retracted by a retraction device to separate it from the fixed mold 21. Subsequently, the ejection pins are advanced by an extrusion mechanism (not shown) to release the casting from the fixed mold 21. This completes the casting of the casting by the casting apparatus 1.

[0054] As described above, the casting apparatus 1 according to the present invention, as shown in Figures 1 to 4, comprises a mold 2 for forming a cavity 20, a cylindrical bush 3 attached to the mold 2, and a sliding pin 4 inserted into a guide hole 31 formed in the bush 3 so as to be able to move back and forth. The bush 3 has a lubricant supply passage 50 for supplying lubricant into the guide hole 31, and a plurality of grooves 44 communicating with the lubricant supply passage 50 are provided on the outer circumferential surface 4a of the sliding pin 4.

[0055] With this configuration, the casting apparatus 1 of the present invention has a plurality of grooves 44 that communicate with the lubricant supply passage 50 formed on the outer circumferential surface 4a of the sliding pin 4, so that a sliding pin 4 with a simple shape of lubricant supply passage 50 that is easy to process can be formed. In addition, the outer circumferential surface 4a of the sliding pin 4 can supply lubricant sent from the lubricant supply passage 50 to the plurality of grooves 44. As a result, as shown in Figure 3, by moving the sliding pin 4 forward, the plurality of grooves 44 can be sent into the enlarged diameter portion 31c, and the lubricant, which also functions as a mold release agent, can be applied to the inner surface of the enlarged diameter portion 31c. Then, by moving the sliding pin 4 backward as shown in Figure 2, the lubricant can be evenly applied to the inner surface of the guide hole 31 facing the plurality of grooves 44. For this reason, the lubrication apparatus 5 can eliminate the need for the conventionally used spray 200 (see Figure 5). Furthermore, since the bush 3 has a lubricant supply passage 50 that supplies lubricant into the guide hole 31, the outer surface 4a of the sliding pin 4 in the guide hole 31 can be positioned in a state where it is immersed in lubricant, thereby stabilizing the lubrication. For this reason, the present invention can improve the sliding performance of the sliding pin 4, thereby eliminating galling (seizing) and extending the life of the sliding pin 4.

[0056] Furthermore, as shown in Figures 1 to 4, the multiple grooves 44 consist of grooves formed at an angle to the axis O1 of the guide hole 31.

[0057] With this configuration, the multiple grooves 44 consist of grooves formed at an angle to the axis O1 of the guide hole 31. As a result, by moving the sliding pin 4 in the forward and backward direction, the lubricant in the lubricant reservoir 52 can be applied to the entire circumferential surface of the enlarged diameter portion 31c and the second support portion 31e of the bush 3. As a result, the multiple grooves 44 improve the lubricity and sliding properties during the forward and backward movement of the sliding pin 4, thereby eliminating galling and extending the life of the sliding pin 4.

[0058] Furthermore, as shown in Figure 1, the sliding pin 4 has a large-diameter portion 43 provided on the tip side of the sliding pin 4 and sliding on the inner circumferential surface of the guide hole 31, and a small-diameter portion 41 provided on the base side of the large-diameter portion 43 and formed to be smaller in diameter than the large-diameter portion 43. Multiple grooves 44 are provided on the small-diameter portion 41 side of the outer circumferential surface 4a of the large-diameter portion 43, and the multiple grooves 44 communicate with the lubricant supply passage 50 via an annular lubricant storage chamber 52 formed on the outer circumferential side of the small-diameter portion 41.

[0059] With this configuration, the multiple grooves 44 communicate with the lubricant supply passage 50 via an annular lubricant reservoir 52 formed on the outer circumference of the small-diameter portion 41. Therefore, in this invention, the small-diameter portion 41 located in the lubricant reservoir 52 is always immersed in lubricant, thereby improving the sliding performance of the sliding pin 4 and preventing galling.

[0060] Furthermore, as shown in Figure 1, the tip side of the guide hole 31 is provided with an enlarged diameter portion 31c that widens towards the tip, and when the sliding pin 4 advances and the large diameter portion 43 is positioned within the enlarged diameter portion 31c, the tip end of the groove 44 is exposed to the enlarged diameter portion 31c.

[0061] With this configuration, the enlarged diameter portion 31c provided on the tip side of the guide hole 31 is positioned such that when the sliding pin 4 advances and the large diameter portion 43 is positioned within the enlarged diameter portion 31c, the tip end of the groove 44 is exposed to the enlarged diameter portion 31c. Therefore, since the lubricant stored in the lubricant storage chamber 52 is supplied from the groove 44 to the enlarged diameter portion 31c, the lubricant, which functions as a mold release agent, can be applied to the inner surface of the enlarged diameter portion 31c, making it easier to remove any molten metal that has adhered to it.

[0062] Furthermore, as shown in Figure 1, the guide hole 31 has a first support portion 31d formed on the base end side of the lubricant storage chamber 52 and supporting the large diameter portion 42 provided on the base end side of the sliding pin 4, and a second support portion 31e formed on the tip side of the lubricant storage chamber 52 and supporting the large diameter portion 43 provided on the tip side of the sliding pin 4, and the first support portion 31d and the second support portion 31e are formed to suppress the leakage of lubricant stored in the lubricant storage chamber 52 from the lubricant storage chamber 52.

[0063] With this configuration, the bush 3 has a first support portion 31d that supports the large diameter portion 42 on the base end side of the sliding pin 4, and a second support portion 31e that supports the large diameter portion 43 on the tip side of the sliding pin 4, thereby enabling the sliding pin 4 to be supported without looseness. Furthermore, the first support portion 31d and the second support portion 31e of the bush 3 prevent lubricant from leaking out of the lubricant storage chamber 52, so that the lubricant in the lubricant storage chamber 52 can always be efficiently supplied to the multiple grooves 44 that communicate with the lubricant storage chamber 52.

[0064] [Differentiation] Furthermore, the present invention is not limited to the embodiments described above, and various modifications and changes are possible within the scope of its technical concept. Naturally, the present invention also extends to these modified and altered inventions.

[0065] In the above embodiment, as an example of the sliding pin 4, a case was described in which secondary pressure is applied inside the cavity 20 by manually pushing the sliding pin 4 into the guide hole 31 of the bush 3, but the shape is not limited to this. The sliding pin 4 may be moved back and forth within the guide hole 31 of the bush 3 by a reciprocating device that is driven to move back and forth by electric or hydraulic power.

[0066] Furthermore, the multiple grooves 44 formed obliquely to the direction of the axis O1 may be arranged in a manner in which multiple spirally formed grooves overlap when viewed from the axial direction. [Explanation of Symbols]

[0067] 1. Casting apparatus 2 molds 3 Bush 4. Sliding pin 4a Outer surface 20 Cavity 31 Guide holes 31a Small hole 31b Large hole 31c Expanded diameter part 31d 1st support part 31e 2nd support part 41 Small diameter section 42, 43 Large diameter section 44 Groove 50 Lubricant supply channel 51 Lubricant supply device 52 Lubricant storage chamber O1 axis center line

Claims

1. A mold for forming a cavity, A cylindrical bush attached to the mold, The bush comprises a sliding pin that is inserted into a guide hole formed in the bush so as to be able to move back and forth, The aforementioned bush, The guide hole has a lubricant supply passage for supplying lubricant, Multiple grooves communicating with the lubricant supply passage are provided on the outer circumferential surface of the sliding pin. The aforementioned sliding pin is A large-diameter portion is provided on the tip side of the sliding pin and slides on the inner circumferential surface of the guide hole, It has a smaller diameter portion that is provided on the base end side of the larger diameter portion and is formed to be smaller in diameter than the larger diameter portion, The aforementioned plurality of grooves are provided on the outer surface of the large diameter portion on the side of the small diameter portion, The plurality of grooves communicate with the lubricant supply passage via an annular lubricant storage chamber formed on the outer circumference of the small diameter portion. The aforementioned guide hole is A first support portion is formed on the base end side of the lubricant reservoir chamber and supports the large diameter portion provided on the base end side of the sliding pin, A second support portion is formed on the tip side of the lubricant reservoir chamber and supports the large-diameter portion provided on the tip side of the sliding pin, It has, The first support portion and the second support portion are formed to prevent the lubricant stored in the lubricant storage chamber from leaking out of the lubricant storage chamber. Casting apparatus.

2. A mold for forming a cavity, A cylindrical bush attached to the mold, The bush comprises a sliding pin that is inserted into a guide hole formed in the bush so as to be able to move back and forth, The aforementioned bush, The guide hole has a lubricant supply passage for supplying lubricant, Multiple grooves communicating with the lubricant supply passage are provided on the outer circumferential surface of the sliding pin. The aforementioned sliding pin is A large-diameter portion is provided on the tip side of the sliding pin and slides on the inner circumferential surface of the guide hole, It has a smaller diameter portion that is provided on the base end side of the larger diameter portion and is formed to be smaller in diameter than the larger diameter portion, The aforementioned plurality of grooves are provided on the outer surface of the large diameter portion on the side of the small diameter portion, The plurality of grooves communicate with the lubricant supply passage via an annular lubricant storage chamber formed on the outer circumference of the small diameter portion. The tip side of the guide hole is provided with an enlarged diameter portion that widens towards the tip. With the sliding pin advanced and the large-diameter portion positioned within the enlarged-diameter portion, the tip end of the groove is exposed within the enlarged-diameter portion. The aforementioned guide hole is A first support portion is formed on the base end side of the lubricant reservoir chamber and supports the large diameter portion provided on the base end side of the sliding pin, A second support portion is formed on the tip side of the lubricant reservoir chamber and supports the large-diameter portion provided on the tip side of the sliding pin, It has, The first support portion and the second support portion are formed to prevent the lubricant stored in the lubricant storage chamber from leaking out of the lubricant storage chamber. Casting apparatus.

3. The plurality of grooves consist of grooves formed at an angle to the axis of the guide hole. A casting apparatus according to claim 1 or claim 2.

4. The tip side of the guide hole is provided with an enlarged diameter portion that widens towards the tip. With the sliding pin advanced and the large diameter portion positioned within the enlarged diameter portion, the tip of the groove The end of the side is exposed to the enlarged diameter portion. The casting apparatus according to claim 1.

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