JP2007029986A - Method for casting parallel crosses-shaped cast product, metallic mold for casting parallel crosses-shaped cast product, and parallel crosses-shaped cast product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique with which, regarding a method for casting a parallel crosses-shaped cast product, such as a suspension member, the product quality can be improved and the cost can be reduced by downsizing facility specifications of a die casting machine. <P>SOLUTION: In the method for casting the parallel crosses-shaped cast product, molten metal 4 is poured from an outlet position 15 in a runner 12 positioned at almost center part of either one of vertical side constituting parts 3L, 3R forming two vertical sides in the upper and lower directions of a parallel crosses-shaped cavity 3, and the molten metal 4 is circulated in one side direction in the parallel crosses-shaped cavity 3 and again, made to reach the outlet position 15 and made to flow together with the molten metal 4 poured from the outlet position 15. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a casting technique for a cross-shaped cast product, and pays attention to a product defect caused by the shape of the molten metal around the molten metal, and solves the product defect and improves the product quality. It relates to the technology to be planned.

Conventionally, a technique related to a casting technique for a cross-girder-shaped cast product has been well known, and there is a document that discloses a technique for improving the quality of a cross-girder-shaped suspension member that is a main structure in automobile parts (for example, patents). References 1 and 2).
In the techniques disclosed in Patent Documents 1 and 2, as shown in FIG. 6, a sleeve gate 51 through which molten metal is injected by the operation of a plunger (not shown) is arranged at a substantially central portion of a space surrounded by a well beam. At the same time, by forming the runners 52a to 52d from the gate 51 toward the four corners of the cross beam, it is possible to precisely configure the portions near the outlets of the runners 52a to 52d. In this configuration, the mold cavity is configured in an X shape by the runners 52a to 52d.
FIG. 7 shows a cavity structure of a conventional general casting mold. A sleeve gate 61 is arranged below the cross-shaped cavity, and a plurality of gates 61 are formed from the gate 61 upward to the mold. The runners 62a, 62b,... Are formed, and the molten metal flows from the lower side to the upper side of the cavity.
JP 2002-137758 A JP 2002-137759 A

  In the configuration shown in FIG. 6, since the gate 51 of the sleeve is arranged inside the cross beam shape, the cross-sectional area of the mold can be made narrower than the configuration shown in FIG. 7, that is, in this example 6, the vertical dimension T1 of the mold 55 in FIG. 6 can be made shorter than the vertical dimension T2 of the mold 65 in FIG. 7, thereby reducing the equipment size of the die casting machine. Is obtained. By downsizing the equipment specifications of this die casting machine, it is possible to significantly reduce costs, such as reduction in mold material costs and use of equipment with a small clamping force output.

  However, in the configuration of the runners 52a to 52d, first, with respect to the runners 52a and 52b directed downward from the gate 51, the molten metal freely flows by gravity before the injection operation of the molten metal by the plunger is started. Therefore (because it falls), there is a concern that the molten metal that has flowed down earlier solidifies first. Then, the previously solidified molten metal is mixed in the subsequently injected molten metal, causing a turbulent state of the molten metal, and there is a concern that a defective product such as a crack may be caused.

  Moreover, in the total four places shown by the arrow 53a-53d of a figure, although the molten metal poured from each runway 52a-52d will merge, a molten metal will be in a turbulent flow state in this junction, and air There is a possibility that casting defects such as entrainment, hot water boundaries, and hot water wrinkles may occur, and there is a concern that it is difficult to ensure stable product quality.

On the other hand, according to the configuration shown in FIG. 7, there is no problem of the above-described free flow of the molten metal, and furthermore, since the joining location is only one location indicated by the arrow 63a, it is compared with the product having the configuration shown in FIG. Therefore, it can be expected that good product quality can be obtained.
However, in the configuration shown in FIG. 7, as described above, there is a contradiction that the specifications of the equipment of the die casting machine are large and the cost cannot be reduced.

  Accordingly, in view of the above problems, the present invention relates to a method for casting a cross-girder-shaped cast product such as a suspension member, which can improve product quality and can reduce costs by downsizing the equipment specifications of a die casting machine. The technology to do is proposed.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

That is, as described in claim 1,
Of the vertical side components that form the two vertical sides of the vertical girder-shaped cavity,
Pour the molten metal from the exit location of the runway located in one of the vertical side components,
The molten metal circulates in one direction in the cavity, and again reaches the outlet location,
Let it merge with the molten metal poured from the exit location,
This is a method for casting a cross-shaped cast product.

Moreover, as described in claim 2,
Comprising a fixed mold and a movable mold constituting the vertical mating surface;
A cross-shaped cavity is constituted by the fixed mold and the movable mold,
The cavity is communicated with a sleeve through which a molten metal is injected by a plunger through a runner,
The gate is arranged within a range surrounded by a cross-beam shape of the cavity,
The runner has a first runner that is formed upward from the gate.
This is a casting mold for a cross-shaped cast product.

Moreover, as described in claim 3,
The runway
From the first runway, having a second runway that communicates with any one of the vertical side constituent parts among the vertical side constituent parts that form the two vertical sides of the cavity in the vertical direction of the cavity,
This is a casting mold for a cross-shaped cast product.

Moreover, as described in claim 4,
The second runner is configured such that the molten metal flows obliquely downward from the first runner toward the vertical side component,
After the molten metal poured into the vertical side component is poured into the vertical side component, the molten metal is turned downward by the pressure of the molten metal supplied as needed, in the cross-shaped cavity, in one side direction It is configured to be circulated.

  Further, as described in claim 5, a cross-shaped cast product cast using the casting mold of claim 2 or claim 3 is provided.

  In the invention according to the first aspect described above, since the molten metal joins one place, the situation in which a turbulent state of the molten metal can occur can be minimized. In addition, it is possible to suppress the occurrence of casting defects such as air entrainment, hot water boundary, hot water wrinkles and the like due to the turbulent flow of the molten metal, and the product quality can be improved.

Further, in the invention described in claim 2, since the first runner running upward from the gate is formed, the molten metal freely flows down into the cavity and solidifies first before the start of the plunger injection operation. Therefore, it is possible to prevent the occurrence of turbulent flow of the molten metal, thereby improving the product quality.
In addition, since the gate and the runner are arranged within the range surrounded by the shape of the cavity cross beam, compared to the configuration in which the gate and the runway are arranged outside the cavity cross beam shape, The cross-sectional area can be narrowed, the downsizing of the equipment specifications of the die casting machine, and the cost of equipment can be reduced.

  In the invention according to claim 3, since the molten metal joins one place, the situation in which a turbulent state of the molten metal can occur can be minimized. In addition, it is possible to suppress the occurrence of casting defects such as air entrainment, hot water boundary, hot water wrinkles and the like due to the turbulent flow of the molten metal, and the product quality can be improved.

  Moreover, in invention of Claim 4, since a molten metal can be circulated to one side direction and the molten metal merges into one place, the situation where the turbulent state of the molten metal can occur is minimized. be able to. In addition, it is possible to suppress the occurrence of casting defects such as air entrainment, hot water boundary, hot water wrinkles and the like due to the turbulent flow of the molten metal, and the product quality can be improved.

  Moreover, in the invention of Claim 5, a casting defect is suppressed and it has high product quality.

  FIG. 1 and FIG. 2 show a casting mold applied to the implementation of the casting method according to the present invention, comprising a fixed mold 1 and a movable mold 2 that constitute a vertical mating surface, and the fixed mold. 1 and the movable mold 2 form a cross-shaped cavity 3, and the cavity 3 is communicated with a spout 11 of a sleeve 10 through which a molten metal 4 is injected by a plunger 6 through a runner 12. The runner 12 is disposed in a range surrounded by the cross beam shape of the cavity 3, and the runner 12 is formed upward from the gate 11, and the first runner 12 b and the first runner 12 b The second runner 12c communicates with either one of the vertical side constituent parts 3R among the vertical side constituent parts 3L and 3R forming the two vertical sides of the cavity 3 in the vertical direction. It is supposed to be.

In the above configuration, since the first runner 12b is formed upward from the gate 11, the molten metal 4 freely flows into the cavity 3 and solidifies first before the injection operation of the plunger 6 starts. Therefore, it is possible to prevent the turbulent flow of the molten metal 4 and thereby improve the product quality.
Moreover, since the said gate 11 and the runner 12 are arrange | positioned in the range enclosed by the cross-girder shape of the cavity 3, compared with the structure by which these gates and runners are arrange | positioned outside the cross-girder shape of the cavity 3. The mold cross-sectional area can be made narrower, the downsizing of the equipment specifications of the die casting machine, and the equipment cost can be reduced.
In addition, since it is possible to cope with equipment with a small clamping force output, it is possible to provide a high-quality product with a general-purpose horizontal die casting machine.

  Hereinafter, the details of the above configuration will be described. As shown in FIGS. 1 and 2, the fixed mold 1 has a distal end portion of the sleeve 10 inserted therein, and an opening at the distal end is configured as a gate 11. The molten metal 4 is poured from the gate 11 into the runway inlet 12a. In the sleeve 10, the plunger 6 is slid, and the molten metal 4 is injected toward the runner inlet portion 12a.

Further, between the fixed mold 1 and the movable mold 2, a girder-shaped cavity 3 is formed. In the configuration shown in the figure, an example is shown in which the cavity 3 in the case of casting the suspension member is configured. The cavity 3 is formed in a cross beam shape from two vertical side components 3L and 3R in the vertical direction and two horizontal side components 3U and 3D in the horizontal direction.
In the example shown in FIGS. 1 and 2, the vertical width of the mold is configured to be wider than the horizontal width, and the vertical dimension of the cross beam shape is configured to be longer during casting. The configuration may be as follows, and is not particularly limited.

  Further, the runner inlet portion 12a is located inside the cavity 3 formed in a cross-beam shape as described above, that is, within a range surrounded by the vertical side component portions 3L and 3R and the horizontal side component portions 3U and 3D. And the gate 11 of the sleeve 10 is arranged.

A first runner 12b is formed upward from the runner entrance 12a.
The lowermost part of the first runner 12b is disposed above the uppermost part of the gate 11, and the uppermost part of the gate 11 is filled with the molten metal 4, and then the molten metal 4 is added to the runner 12b. Is being poured.

Further, from the first runner 12b, either one of the two vertical side components 3L and 3R, that is, in the configuration of FIG. 1, toward the vertical side component 3R arranged on the right side in the drawing, A second runway 12c is configured.
The branch point 12m from the first runner 12b to the second runner 12c is disposed above the uppermost part of the runner inlet 12a, and the molten metal 4 in the runner inlet 12a. Is moved upward through the first runner 12b and then poured into the second runner 12c.

The second runner 12c is configured such that the molten metal 4 flows obliquely downward from the first runner 12b toward the vertical side component 3R, and is poured into the vertical side component 3R. The molten metal 4 to be peeled is poured downward by the pressure of the molten metal supplied from time to time after being poured into the vertical side component 3, and is circulated in one direction in the cross-shaped cavity 3 ( It is configured to be rotated clockwise in the figure (see FIG. 3).
In the configuration shown in FIG. 1, the second runner 12 c is configured wider in the width direction with respect to the flow direction of the molten metal 4, and as the upper wall surface 12 u and the lower wall surface 12 d approach the vertical side component 3. By inclining so that it may fall, it is comprised so that the molten metal 4 may flow diagonally downward.

  Further, as shown in FIG. 4, the second runner 12 c is provided with guide portions 14, 14... Extending obliquely downward from the first runner 12 b toward the vertical side constituting portion 3 </ b> R. The second runner 12c is divided into a plurality of runners 12d to 12f inclined downward from the first runner 12b toward the vertical side component 3R by the guide portions 14, 14. It is good also as composition to be.

In the configuration described above, when the molten metal 4 is injected by the plunger 6, the suspension member 5 is cast and formed by the hot water as shown in FIG.
The first stage 31 shown in FIG. 3 shows the state shown in FIG. 2, that is, the state before the molten metal 4 is poured into the sleeve 10 and the injection operation by the plunger 6 is started. Since the molten metal surface 4a of the molten metal 4 does not reach the uppermost part of the gate 11, the molten metal 4 is not poured into the molten metal channels 12b and 12c through the molten metal inlet portion 12a.
From this, before the injection operation of the molten metal 4 by the plunger 6 is started, the molten metal 4 does not flow freely into the cavity 3, but the solidification of the molten metal caused by the free flowing of the molten metal 4, Furthermore, there is no problem of quality deterioration due to the mixing of the solidified product.

Next, when the injection operation of the molten metal 4 by the plunger 6 is started, as shown in the second stage 32 of FIG. 3, the molten metal 4 poured into the runner inlet portion 12 a is firstly the first runner 12 b. After flowing in and moving upward, it flows into the second runner 12 c and flows into the vertical side component 3 </ b> R of the cavity 3.
The molten metal 4 that has flowed into the vertical side component 3 </ b> R of the cavity 3 flows downward from the inclination of the second runner 12 b and flows into the horizontal side component 3 </ b> D below the cavity 3.

  Then, as shown in the third stage 33 and the fourth stage 34 in FIG. 3, the molten metal 4 turns to the vertical side constituting part 3L and the upper horizontal side constituting part 3T, and again to the vertical side constituting part 3R. To reach. In the longitudinal side component 3R, the molten metal 4 is merged at the connection point between the second runner 12c and the longitudinal side component 3R, that is, at the outlet 15 of the second runner 12c. . In addition, the exit location 15 here means the location which opposes the opening part with respect to the vertical side structure part 3R of said 2nd runner 12c among the vertical side structure part 3R.

In this way, by joining the molten metal 4 at the outlet 15 of the second runner 12c, the molten metal 4 is poured from the second runner 12c even when air entrainment occurs at the time of joining. Since the molten metal 4 that has joined is in a pressure-up state immediately after joining, the entrained air can be crushed to prevent the formation of a cast hole.
Moreover, even if the temperature of the molten metal 4 that has been poured into the cavity 3 first and then circulates in the cavity 3 decreases and starts to solidify, the merged molten metal 4 is in a pressurized state immediately after merging and penetrates each other. By joining together, it becomes possible to prevent the occurrence of casting defects such as hot water boundaries and hot water wrinkles.

As described above, in the present invention, of the vertical side components 3L and 3R that form the two vertical sides of the vertical girder-shaped cavity 3 in the vertical direction, the approximate center of one of the vertical side components 3 The molten metal 4 is poured from the outlet 15 of the runner 12 (second runner 12c) located in the section, and the molten metal 4 is made to circulate in one direction in the cavity 3 of the cross-girder shape, and again to the outlet 15 It is made into the casting method made to reach | attain and merge with the molten metal 4 poured from the said exit location 15. FIG.
And since the joining location of the molten metal 4 becomes one place by this casting method, the situation where the turbulent flow state of the molten metal 4 can generate | occur | produce can be suppressed to the minimum. In addition, it is possible to suppress the occurrence of casting defects such as air entrainment, hot water boundary, hot water wrinkles and the like due to the turbulent flow of the molten metal 4, thereby improving the product quality.

In the above embodiments, the case where the suspension member is formed has been described as an example. However, the present invention can be applied not only to the suspension member but also to casting of a cross-shaped cast product.
The cast product molded according to the present invention has high product quality with reduced casting defects, and a high-quality suspension member with high rigidity can be realized as an example of a suspension member.

  In addition, regarding the downsizing of the equipment specifications of the die casting machine, using the casting mold according to the present invention, the equipment specifications of about one-third of the conventional size (the output of the clamping force is about one-third) ), A test piece was cut out from the cast product, and a tensile test was conducted. As a result, according to the conventional equipment specifications, the tensile strength was 195 Mpa, the 0.2% proof stress was 130 Mpa, and the elongation was 8%. However, with the conventional equipment specification of about one-third the size, the tensile strength was 188 Mpa, the 0.2% proof stress was 135 Mpa, and the elongation was 9.5%. It was confirmed that the result was obtained.

  Furthermore, in the above embodiment, as shown in FIG. 1, from the first runner 12b, one of the two vertical side components 3L and 3R, that is, in the configuration of FIG. The second runner 12c is configured toward the vertical side component 3R disposed on the second side, but as illustrated in FIG. 5, the second runner 12c is directed toward both the two vertical side components 3L and 3R. Two runners 12r and 12s may be configured.

Also in the configuration of FIG. 5, the presence of the first runner 12 b prevents the molten metal 4 from freely flowing into the cavity 3 and solidifying before the start of the injection operation of the plunger 6. Generation of turbulent flow 4 can be prevented, thereby improving product quality.
Moreover, since the said gate 11 and the runner 12 are arrange | positioned in the range enclosed by the cross-girder shape of the cavity 3, compared with the structure by which these gates and runners are arrange | positioned outside the cross-girder shape of the cavity 3. The mold cross-sectional area can be made narrower, the downsizing of the equipment specifications of the die casting machine, and the equipment cost can be reduced.
In addition, since it is possible to cope with equipment with a small clamping force output, it is possible to provide a high-quality product with a general-purpose horizontal die casting machine.

The front view shown about the structure of the casting metal mold | die which concerns on this invention. AA sectional view taken on the line AA of FIG. The figure explaining the hot water circumference of a molten metal. The figure shown about the other structural example of a 2nd runway. The figure shown about the structural example by which a 2nd runway is connected to two vertical side structure parts. The figure shown about the structural example of the casting metal mold | die of the conventional caster-shaped casting product. The figure similarly shown about the other structural example of the casting metal mold | die of the conventional caster shaped casting.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fixed type 2 Movable type 3 Cavity 3L * 3R Vertical side structure part 4 Molten metal 12 Runway 12a Runway inlet part 12b 1st runway 12c 2nd runway 15 Exit location

Claims (5)

Of the vertical side components that form the two vertical sides of the vertical girder-shaped cavity,
Pour the molten metal from the exit location of the runway located in one of the vertical side components,
The molten metal circulates in one direction in the cavity, and again reaches the outlet location,
Let it merge with the molten metal poured from the exit location,
Casting method for well-girder shaped castings. Comprising a fixed mold and a movable mold constituting the vertical mating surface;
A cross-shaped cavity is constituted by the fixed mold and the movable mold,
The cavity is communicated with a sleeve through which a molten metal is injected by a plunger through a runner,
The gate is arranged within a range surrounded by a cross-beam shape of the cavity,
The runway
Having a first runner formed upward from the gate,
Casting mold for well-shaped castings. The runway
From the first runway, having a second runway that communicates with either one of the vertical side constituent parts among the vertical side constituent parts that form the two vertical sides in the vertical direction of the cavity shape of the cavity,
The casting mold of the cross-girder-shaped casting according to claim 2, wherein The second runway is
The molten metal is configured to flow obliquely downward from the first runner toward the vertical side component,
The molten metal poured into the vertical side component is
After being poured into the vertical side component, it is turned downward by the pressure of the molten metal supplied as needed, and is configured to circulate in one side direction in the cross-girder-shaped cavity,
The casting mold of the cross-girder-shaped casting according to claim 3, wherein   A well-shaped cast product cast using the casting mold according to claim 3 or 4.