JP2012096243A - Mold cooling structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mold cooling structure in which an inner pipe is easily attached and detached to facilitate maintenance.SOLUTION: The mold cooling structure is constituted in the following. A flange part 12 protruded radially outwardly is provided to the lower end of an inner pipe 10, and a spring 8 is arranged under a compressed state between the flange part 12 and a buried plug 7, whereby the flange part 12 is pressed onto a shoulder surface 5c of a first through hole 5 to fix the inner pipe 10 to a molding die 1.

Description

  The present invention relates to a mold cooling structure.

  In die casting, low pressure casting, etc., in order to improve the quality and productivity of the cast product, the coolant (for example, cooling water) is circulated through the coolant passage provided in the mold so that the molten metal injected into the cavity is May cool. For example, in Patent Document 1, as shown in FIG. 4, a plurality of cooling holes 102 extending to the vicinity of the cavity surface 101a, a main supply passage 104 for supplying a refrigerant into the mold from the supply port 103, and a main supply A plurality of branch supply passages 105 for supplying refrigerant from the passage 104 to the plurality of cooling holes 102, a discharge passage 109 for discharging the refrigerant supplied from the branch supply passage 105 to the cooling holes 102 to the outside of the mold from the discharge port 108, A mold cooling structure with is shown.

  The branch supply passage 105 is provided in an inner pipe (supply pipe) 106 having one end inserted into the cooling hole 102. The other end of the inner pipe 106 is fixed to the plug 107 by welding or the like, and the plug 107 is detachably fixed to the first through hole 111 provided in the horizontal partition 110 in the mold. A second through hole 121 is provided in the bottom wall portion 120 of the mold, and a plug 130 is detachably attached to the second through hole 121.

JP 2000-42712 A

  In the mold cooling structure as described above, industrial water is often used as a refrigerant. Since industrial water contains impurities such as chlorides such as chalk and foreign matters such as dust, if these impurities adhere to and accumulate on the inner wall of the inner pipe 106, the branch supply passage 105 becomes narrow and the refrigerant flows. It is impeded, and the mold may not be sufficiently cooled, and casting defects may occur. For this reason, it is necessary to periodically remove the inner pipe 106 from the mold and clean the inside of the inner pipe 106.

  For example, in the mold shown in FIG. 4, the inner pipe 106 is maintained as follows. First, after removing the plug 130 from the second through hole 121 of the bottom wall part 120, the plug 107 and the inner pipe 106 are connected to the first through hole 111 of the horizontal partition wall part 110 through the second through hole 121. Remove the unit. Then, after cleaning the inside of the inner pipe 106, an integrated product of the plug 107 and the inner pipe 106 is attached to the first through hole 111, and the plug 130 is attached to the second through hole 121.

  However, since there may be 100 or more inner pipes 106 in one mold when there are many, the operation of attaching / detaching the plug 107 and the plug 130 for each inner pipe 106 as described above performs maintenance. This is a heavy burden on the operator.

  Further, the plug 107 is fixed to the through hole 111 by, for example, screwing. However, if the tightening force of the plug 107 on the through hole 111 is too weak, the refrigerant leaks between the main supply passage 104 and the discharge passage 109. There is a fear. On the other hand, if the tightening force of the plug 107 is too strong, the inner pipe 106 may be deformed, which may hinder the flow of the refrigerant in the branch supply passage 105. Therefore, when attaching the inner pipe 106 to the mold, it is necessary to attach the plug 107 to the through hole 111 while appropriately controlling the tightening force, which further increases the burden on the operator.

  Furthermore, the plug 107 is detachably attached to the through-hole 111 by screwing or press-fitting. However, since both ends of the both fixing portions are in contact with the refrigerant, impurities in the refrigerant easily enter the fixing portion. . If the impurities bite into the fixing part (screwed part or press-fitting part), the plug 107 becomes difficult to attach and detach, and in the worst case, the plug 107 may not be removed from the first through hole 111.

  The problem to be solved by the present invention is to provide a mold cooling structure in which an inner pipe is easily attached and detached and easy to maintain.

  The present invention has been made to solve the above problems, a cooling hole formed in a mold, a supply passage through which a refrigerant supplied from the outside flows, one end opened inside the cooling hole, and the other end is a supply passage. An inner pipe having a communication passage opened at the other end and a flange portion projecting to the outer diameter at the other end, a discharge passage for discharging the refrigerant supplied to the cooling hole through the communication passage, and the supply passage and the outside The mold cooling structure includes a through hole that communicates with the plug and a plug that is detachably attached to the through hole, and the elastic member is compressed between the flange portion of the inner pipe and the plug. By arranging, the inner pipe is fixed to the mold by pressing the flange portion against the mold.

  As described above, in the mold cooling structure according to the present invention, the elastic member is disposed in a compressed state between the plug and the flange portion, thereby pressing the flange portion against the mold, thereby causing the inner pipe to be the mold. It is fixed. According to this structure, by removing the plug from the mold, the compressive force of the elastic member that presses the flange portion against the mold is released, and the inner pipe can be removed from the mold. In this way, the inner pipe can be removed simply by removing one plug, so the workability is markedly improved compared to the configuration shown in FIG. 4 in which two plugs need to be removed for each inner pipe. improves. The “mold” here includes not only a mold having a molding surface but also a member (for example, a cooling plate) fixed to the mold.

  Moreover, according to said structure, the fixing force to the metal mold | die of an inner pipe can be managed with the elastic force (elastic coefficient and compression amount) of an elastic member. Therefore, if the elastic coefficient and compression amount of the elastic member (distance between the flange portion and the plug) are set so that the elastic force of the elastic member is appropriate, the flange portion of the inner pipe is always molded with the proper force. Can be pressed against. As a result, it is not necessary to manage the tightening force of the embedding plug when attaching / detaching the inner pipe, so that workability is further improved.

  Further, according to the above structure, the inner pipe can be detachably attached to the mold by pressing the flange portion against the abutting surface of the mold by the elastic member. There is no need to provide a screwing part or a press-fitting part. Therefore, impurities in the refrigerant do not enter the screwing part or the press-fitting part, and the removal of the inner pipe from the mold is not hindered.

  As described above, according to the mold cooling structure of the present invention, the operation of attaching and detaching the inner pipe is greatly facilitated as compared with the conventional product, and the burden of the maintenance work can be greatly reduced.

It is sectional drawing of the metal mold | die cooling structure which concerns on one Embodiment of this invention. It is a bottom view of the flange part of an inner pipe. It is sectional drawing of the metal mold | die cooling structure which concerns on other embodiment. It is sectional drawing of the conventional metal mold cooling structure.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a mold 1 having a mold cooling structure according to an embodiment of the present invention. The mold 1 has a molding surface 1a and is formed of an integrally formed molding mold, and has the same configuration as the mold shown in FIG. 4 except for the periphery of the inner pipe 10. In the following, in order to clarify the relative positional relationship between the respective parts, description will be made using the vertical direction of FIG. 1, but this does not limit the usage mode of the mold.

  The mold 1 includes an inner pipe 10 having a cooling hole 2 extending to the vicinity of a molding surface 1a, a supply passage 3 through which a refrigerant (for example, cooling water, particularly industrial water) supplied from the outside flows, and a communication passage 13 inside. And a discharge passage 4 for discharging the refrigerant supplied to the cooling hole 2 via the inner pipe 10 to the outside. The upper end of the communication passage 13 of the inner pipe 10 opens into the cooling hole 2, and the lower end opens into the supply passage 3. In the present embodiment, although illustration is omitted, the refrigerant flow paths 13 of the plurality of inner pipes 10 are branched from the single supply passage 3, and a plurality of cooling holes are formed from the plurality of refrigerant flow paths 13. The refrigerant respectively supplied to 2 is collected in one discharge passage 4 and discharged to the outside of the mold.

  The inner pipe 10 is made of, for example, metal, and includes a cylindrical portion 11 and a flange portion 12 that is disposed at the lower end portion of the cylindrical portion 11 and protrudes to the outer diameter. In the present embodiment, the flange portion 12 has a disk shape, and the lower end portion of the cylindrical portion 11 is fixed to the upper end surface of the flange portion 12 by means such as brazing. The inner pipe 10 is formed with a communication passage 13 penetrating the cylindrical portion 11 and the flange portion 12. As shown in FIG. 2, a diametrical groove 12 a is formed on the lower end surface of the flange portion 12. In the illustrated example, two orthogonal grooves 12a are formed, and a communication passage 13 is opened at the intersection of the two grooves 12a (that is, the center of the flange portion 12).

  The mold 1 is provided with a first through hole 5 that communicates the supply passage 3 and the discharge passage 4 and a second through hole 6 that communicates the supply passage 3 and the outside. The first through hole 5 is provided below each cooling hole 2. The second through holes 6 are provided below the first through holes 5, that is, below the flange portions 12 of the inner pipes 10.

  The first through hole 5 has a large-diameter inner peripheral surface 5a opened in the supply passage 3, a small-diameter inner peripheral surface 5b opened in the discharge passage 4, and a shoulder surface 5c formed therebetween. A flange portion 12 of the inner pipe 10 is disposed on the inner periphery of the large-diameter inner peripheral surface 5a, a cylindrical portion 11 of the inner pipe 10 is disposed on the inner periphery of the small-diameter inner peripheral surface 5b, and a flange portion is provided on the shoulder surface 5c. The upper end face of 12 is in contact. Radial gaps are formed between the large-diameter inner peripheral surface 5a and the outer peripheral surface of the flange portion 12, and between the small-diameter inner peripheral surface 5b and the outer peripheral surface of the cylindrical portion 11, respectively.

  The first through hole 5, the second through hole 6, and the cooling hole 2 are arranged approximately coaxially, and are formed from below the mold 1 by machining such as a drill. In order to allow these to be formed from below the mold 1, the inner diameter D1 of the second through hole 6, the inner diameter D2 of the large inner peripheral surface 5a of the first through hole 5, the inner diameter D3 of the small inner peripheral surface 5b, and The inner diameter D4 of the cooling hole 2 has a relationship of D1 ≧ D2 ≧ D3 ≧ D4, and in the illustrated example, D1 = D2> D3 = D4.

  The second through hole 6 is closed with a plug 7. The plug 7 is made of metal, resin, rubber, or the like, and is attached to the second through hole 6 by a detachable means. For example, the inner peripheral surface of the second through-hole 6 is a cylindrical surface, and the outer peripheral surface of the plug 7 is a tapered surface slightly reduced in diameter toward the upper side. The plug 7 is fixed to the second through hole 6 by press-fitting the tapered outer peripheral surface of the plug 7. The fixing method of the embedding plug 7 is not limited to this, and any method may be used as long as it can be fixed with a strength that can withstand an elastic reaction force of a spring 8 described later. For example, screw grooves may be provided on the outer peripheral surface of the plug 7 and the inner peripheral surface of the second through hole 6 and these may be screwed together. Alternatively, press-fitting and screwing may be used in combination.

  Between the upper end face of the plug 7 and the lower end face of the flange portion 12 of the inner pipe 10, a spring 8 as an elastic member is disposed in a compressed state. Due to the elastic force of the spring 8, the upper end surface of the flange portion 12 is pressed against the shoulder surface 5 c of the first through hole 5, whereby the inner pipe 10 is fixed inside the mold 1. At this time, the upper end surface of the flange portion 12 and the shoulder surface 5c of the first through-hole 5 are in close contact with each other, whereby the supply passage 3 and the discharge passage 4 are shut off, and refrigerant leakage therebetween is prevented. In particular, in the illustrated example, the area of the lower end surface of the flange portion 12 is larger than the cross-sectional area of the small-diameter inner peripheral surface 5 a of the first through hole 5. Thereby, the force of pressing the flange portion 12 against the shoulder surface 5c by the pressure of the refrigerant in the supply passage 3 is larger than the force of separating the flange portion 12 from the shoulder surface 5c by the pressure of the refrigerant in the discharge passage 4. The flange portion 12 can be further pressed against the shoulder surface 5c by pressure.

  The elastic force of the spring 8 can be adjusted by the elastic coefficient of the spring 8 and the amount of compression. That is, by setting the type of the spring 8 and the distance between the flange portion 12 and the plug 7 so that the elastic force is appropriate, the flange portion 12 can always be pressed against the shoulder surface 5c with a constant force. it can. In particular, the flange portion 12 can be pressed against the shoulder surface 5c with an equal force by bringing both end portions of the spring 8 into contact with the flange portion 12 and the plug 7 in an annular region (preferably the entire circumference). As a result, the posture of the inner pipe 10 can be stabilized, and the flange portion 12 and the shoulder surface 5c are securely adhered to each other around the entire circumference, so that refrigerant leakage between the supply passage 3 and the discharge passage 4 is ensured. Can be prevented.

  Next, the flow of the refrigerant in the mold cooling structure (see the chain line arrow in FIG. 1) will be described. The refrigerant supplied to the inside of the mold 1 from the outside flows into the communication passage 13 inside the inner pipe 10 through the supply passage 3. At this time, a part of the refrigerant in the supply passage 3 flows into the communication passage 13 in the inner pipe 10 through the gap of the spring 8 or the groove 12a of the flange portion 12 of the inner pipe 10, and the other is supplied as it is. 3 is distributed. In this way, by forming the groove 12a in the flange portion 12, even when the gap of the spring 8 is small and it is difficult for the refrigerant to pass through, the inflow of the refrigerant into the communication passage 13 is promoted through the groove 12a of the flange portion 12. can do.

  Thereafter, the refrigerant flows upward in the communication passage 13 and is supplied into the cooling hole 2 from the upper end opening of the cylindrical portion 11 of the inner pipe 10. In this cooling hole 2, the refrigerant exchanges heat with the mold 1 to cool the molten metal in contact with the molding surface 1a. Thereafter, the refrigerant flows into the discharge passage 4 through the passage between the inner peripheral surface of the cooling hole 2 and the outer peripheral surface of the cylindrical portion 11, and merges with the refrigerant discharged from the other cooling holes 2 to form the mold. 1 is discharged to the outside. The cross-sectional area of the passage formed between the inner peripheral surface of the cooling hole 2 and the outer peripheral surface of the cylindrical portion 11 is larger than the cross-sectional area of the communication passage 13 inside the cylindrical portion 11.

  Next, a maintenance method for the inner pipe 10 in the mold cooling structure will be described. First, the plug 7 is removed from the second through hole 6. As a result, the compression of the spring 8 is released, the force that presses the flange portion 12 of the inner pipe 10 against the shoulder surface 5c of the first through hole 5 is eliminated, and the inner pipe 10 can be removed from the mold 1. In particular, as shown in the figure, when the inner pipe 10 is arranged so that the flange portion 12 is on the lower side, the spring 8 and the inner pipe 10 are lowered by gravity by removing the plug 7 from the second through hole 6. Therefore, the inner pipe 10 can be easily removed. When the upper end surface of the flange portion 12 is fixed to the shoulder surface 5c for some reason, a flange such as a screwdriver is inserted into the groove 12a on the lower end surface of the flange portion 12 and the flange portion 12 is rotated. The inner pipe 10 can be removed by peeling the portion 12 from the shoulder surface 5c.

  After the inside of the inner pipe 10 removed from the mold 1 is cleaned, the inner pipe 10 is attached to the mold 1. Specifically, the upper end surface of the flange portion 12 of the inner pipe 10 is brought into contact with the shoulder surface 5c of the first through hole 5, and the spring 8 is disposed between the flange portion 12 and the plug 7 in a state where The embedding plug 7 is fixed to the second through hole 6.

  In this way, the removal and attachment work of the inner pipe 10 from the mold 1 can be performed only by attaching and detaching the plug 7, so that two inner pipes 10 can be attached to one inner pipe 10 as shown in FIG. 4. Compared with the case where it is necessary to remove the plug, the workability is significantly improved. If the spring 8 is joined and integrated with one or both of the inner pipe 10 and the plug 7, the attaching / detaching operation can be further facilitated.

  Moreover, since the fixing force of the inner pipe 10 is determined by the elastic force and compression amount of the spring 8, the flange portion 12 can always be pressed against the shoulder surface 5c with a constant force. Therefore, when the inner pipe 10 is attached to the mold 1, it is not necessary to manage the tightening force, so that workability is further improved.

  Furthermore, since a gap is formed between the outer peripheral surface of the flange portion 12 and the large-diameter inner peripheral surface 5a of the first through hole 5, for example, when these are screwed or press-fitted, It is possible to avoid a situation in which the impurities in the refrigerant bite into the fixed portion and the attachment / detachment of the inner pipe 10 is hindered.

  The present invention is not limited to the above embodiment. For example, in the above-described embodiment, the mold 1 has a molding surface 1a and is formed of an integrally formed molding mold. However, the present invention is not limited to this, as shown in FIG. The mold 1 may be composed of a molding mold 21 having a molding surface 1a and a cooling plate 22, and a mold cooling structure may be provided on these. In the illustrated example, the cooling plate 20 is attached to the lower surface of the molding die 21 having the molding surface 1 a and the cooling hole 2 via an annular seal 23. The cooling plate 22 is provided with a supply passage 3, a discharge passage 4, a first through hole 5, and a second through hole 6. In this case, since the first through-hole 5 can be processed from above, the inner diameter D3 of the small-diameter inner peripheral surface 5b of the first through-hole 5 can be formed smaller than the inner diameter D4 of the cooling hole 2. (D3 <D4). Thereby, since the area of the shoulder surface 5c spreads and the contact area with the flange part 12 can be expanded, the sealing performance between the supply passage 3 and the discharge passage 4 can be improved further. Since the other configuration of the mold 1 in FIG. 3 is the same as that of the above-described embodiment, a duplicate description is omitted.

  Further, in order to reliably prevent the refrigerant from leaking between the supply passage 3 and the discharge passage 4, between the upper end surface of the flange portion 12 and the shoulder surface 5 c of the first through hole 5, or of the flange portion 12. An annular seal may be provided between the outer peripheral surface and the large-diameter inner peripheral surface 5 a of the first through hole 5.

1 Mold 1a Molding surface 2 Cooling hole 3 Supply passage 4 Discharge passage 5 First through hole 5a Large diameter inner peripheral surface 5b Small diameter inner peripheral surface 5c Shoulder surface 6 Second through hole 7 Filling plug 8 Spring (elastic member)
10 Inner pipe 11 Cylindrical part 12 Flange part 13 Communication passage

Claims (1)

It has a cooling hole formed in the mold, a supply passage through which an externally supplied refrigerant flows, a communication passage having one end opened inside the cooling hole and the other end opened in the supply passage, and is connected to the other end. An inner pipe having a flange portion protruding in the diameter, a discharge passage for discharging the coolant supplied to the cooling hole through the communication passage, a through hole for connecting the supply passage and the outside, and attachment / detachment to the through hole A mold cooling structure with a plug that can be attached,
A mold cooling structure characterized in that an elastic member is disposed in a compressed state between a flange portion of an inner pipe and a plug so that the flange portion is pressed against the mold and the inner pipe is fixed to the mold.

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