JP6207996B2 - Mold device, molten metal pouring device, casting method - Google Patents

Description

  The present invention relates to a mold apparatus, a molten metal injection apparatus, and a casting method.

  Casting is performed by pouring a molten metal melted into a mold and then cooling and solidifying the molten metal in the mold to obtain a cast product having a desired shape. At the time of casting, various defects including shrinkage cavities may be formed on the surface or inside of the cast product. When these defects occur, the repair takes a great deal of labor and cost. Further, depending on the degree of defects, the obtained cast product may be defective and the yield may be reduced.

  One such casting defect is a slag entrainment defect caused by oxidation of the molten metal. This defect is caused when slag is caught in the molten metal during casting, and the slag appears on the surface of the cast product.

  Since the specific gravity of the slag is smaller than that of the molten metal, the slag floats on the surface layer of the molten metal in the molten metal. Therefore, it has been conventionally performed to form a cast product by removing the molten metal from the lower layer of the dam holding the molten metal and feeding the molten metal into a mold.

  Furthermore, as described in Patent Document 1, in order to remove slag from the molten metal fed into the mold space from the dam through the runner formed in the mold, a porous filter is provided on the runner. Has also been done.

Japanese Utility Model Publication No. 63-76338

However, in the method of removing the molten metal from the lower layer in the dam, the slag is actually caught in the mold due to the turbulence of the molten metal in the dam, etc. It is difficult.
Furthermore, if the molten metal is sent in a state where the filter is clogged, the filter may be damaged by the molten metal pressure. When the filter is damaged, the slag and the damaged filter flow into the mold and lead to generation of defects.

  The present invention has been made in view of such circumstances, and is capable of reliably removing slag and enhancing the ease of maintenance such as filter replacement and cleaning, a molten metal pouring device, and a casting. It aims to provide a method.

In order to solve the above problems, the present invention employs the following means.
The mold apparatus of the present invention is a molding recess that forms a cast product by injecting molten metal, a mold body having a runner that injects the molten metal into the molding recess, a dam that stores the molten metal, A belt-shaped first filter that is provided so as to cover an inlet of the molten metal from the dam to the runner and collects foreign matter in the molten metal, and in the runner, the molten metal is more than the first filter. A second filter that collects foreign matter in the molten metal, and a filter roll that is disposed on one side of the injection port, and the first filter is wound into a roll. A feeding portion for feeding out the first filter; and a winding portion that is disposed on the other side of the inlet and winds up the first filter that is drawn out from the feeding portion, wherein the first filter includes the first filter Messi than two filters The opening diameter is set to be large, and the dam has a lower member and an upper member installed above the lower member, and the lower filter housing extends along one direction on the upper surface of the lower member. An upper filter housing groove extending along one direction is formed in the groove and the lower surface of the upper member, and the lower filter housing groove and the upper filter housing groove are in contact with the upper surface of the lower member and the lower surface of the upper member. Thus the upper filter receiving groove, wherein the filter passageways, wherein said first filter is inserted is formed.

As a result, foreign matter such as slag contained in the molten metal is sequentially collected by the first filter having a large mesh opening diameter and the second filter having a small mesh opening diameter from the dam to the molding recess through the runner. Is done. Thereby, it is possible to obtain a cast product of good quality by suppressing the entanglement of foreign matter such as slag into the molten metal in the molding recess.
Moreover, since a foreign substance with a large diameter is removed by the first filter having a large mesh opening diameter, the filter is less likely to be clogged in the second filter.
Furthermore, since the first filter is drawn out from the winding unit, the first filter covering the inlet can be sequentially updated, and filter clogging in the first filter is less likely to occur.
Thus, damage to the first filter and the second filter can be suppressed, and slag can be prevented from flowing into the mold due to filter damage.

The heater may further include a heater for heating the first filter.
By heating the first filter from the room temperature with the heater, it is possible to prevent the molten metal contacting the first filter from being cooled and solidified and adhering to the first filter.

Further, the molten metal injection device of the present invention, a dam that stores the molten metal injected into the mold, and a continuous filter in a strip shape provided to cover the injection port for injecting the molten metal from the dam to the mold, The filter comprises a feeding part that feeds the filter from a filter roll formed by rolling the filter, and a winding part that winds the filter fed from the feeding part, and the dam is a lower member, An upper member installed above the lower member, and a lower filter housing groove extending in one direction on the upper surface of the lower member, and extending in one direction on the lower surface of the upper member upper filter housing groove is formed to the abutted with the lower surface of the upper surface and the upper member of the lower member, thus with the lower filter housing groove in the upper filter housing groove, said filter Wherein the filter passageways are inserted.
With such a molten metal injection device, it is possible to suppress the inclusion of foreign matter such as slag in the molding recess into the molten metal, and to obtain a cast product of good quality.
Moreover, since the filter is drawn out from the feeding portion and taken up from the winding portion, the filter covering the inlet can be sequentially updated, and the filter is less likely to be clogged in the filter.

  Further, the present invention is a casting method in the mold apparatus as described above, wherein the molten metal is injected from the dam provided on the mold body into the molding recess through the first filter and the second filter. And a step of demolding the cast product formed by the molding recess after cooling and solidifying the molten metal.

According to the present invention, it is possible to obtain a cast product of good quality while suppressing the entry of foreign matter such as slag into the molten metal. Further, since the first filter and the filter can be sequentially updated at the portion covering the inlet, the filter in the first filter is less likely to be clogged.
As a result, the slag can be reliably removed and maintenance can be easily performed.

It is sectional drawing which shows the whole structure of the casting_mold | template apparatus which concerns on one Embodiment of this invention. It is sectional drawing which shows the structure of the molten metal injection | pouring apparatus which concerns on one Embodiment of this invention. It is a side view of the dam in the molten metal injection | pouring apparatus which concerns on one Embodiment of this invention. It is a perspective development view of a dam in the molten metal pouring device concerning one embodiment of the present invention.

Hereinafter, an embodiment of a mold apparatus, a molten metal injection apparatus, and a casting method according to the present invention will be described with reference to the drawings.
As shown in FIG. 1, the mold apparatus 10 includes a mold main body 20 that forms a casting by injection of the molten metal M, and a molten metal injection apparatus 30 that injects the molten metal M into the mold main body 20.
In the mold apparatus 10 of the present embodiment, a nonferrous metal such as a copper alloy or an aluminum alloy is used as the molten metal M, for example. The casting product formed by the mold apparatus 10 is not limited in any way, but as an example, a marine screw is formed as a casting product.

  The mold body 20 includes a molding recess 21 that forms a cast product when the molten metal M is injected, and a runner 22 that injects the molten metal M into the molding recess 21.

In the present embodiment, the mold body 20 is a sand mold, and in a casting frame 24D surrounding the outer peripheral portion, a lower mold 24A disposed at the bottom, and a middle mold 24B disposed on the lower mold 24A and formed with the molding concave portion 21. And an upper mold 24C which is disposed on the middle mold 24B and in which the feeder 23 is formed.
The middle mold 24B is provided such that the position of the lower surface 21a of the molding recess 21 is a mold dividing surface with the lower mold 24A, and the position of the upper surface 21b of the molding recess 21 is a mold dividing surface with the upper mold 24C. .

  The runner 22 extends from the gate 22a formed on the upper surface of the upper mold 24C to the lower mold 24A through the upper mold 24C and the middle mold 24B, and extends horizontally in the lower mold 24A. The runner 22 extends upward from a vertically lower side of the molding recess 21, and a weir 22 b is opened on the lower surface 21 a of the molding recess 21.

  Further, the upper mold 24 </ b> C is formed with a feeder part 23 continuously filled above the molding recess 21 and filled with the molten metal M as a feeder.

  As shown in FIGS. 2 to 4, the molten metal injection device 30 includes a dam 31, a strip-shaped first filter (filter) 35, a feeding unit 37 that feeds the first filter 35 from the filter roll 36, and a feeding unit 37. And a winding unit 38 that winds up the first filter 35 that is fed out of the first filter 35.

The dam 31 has a bottomed shape opened upward, and the molten metal M is stored therein. An injection hole (injection port) 32 communicating with the gate 22a is formed in the bottom 31a of the dam 31 so as to penetrate vertically.
The dam 31 is divided into a lower member 33 and an upper member 34 at the bottom 31a in the vertical direction.

  The lower member 33 has a predetermined thickness in the vertical direction, and a lower filter housing groove 33s extending along one direction is formed on the upper surface 33a. A through hole 33h that forms the lower half of the injection hole 32 is formed vertically through the bottom surface of the lower filter housing groove 33s. The width of the lower filter housing groove 33s is set to be larger by a certain dimension (for example, about 30 mm) than the opening diameter D of the through hole 33h.

  The upper member 34 has a predetermined thickness in the vertical direction, and is integrally formed with a bottom plate portion 34a facing the lower member 33 and a side wall portion 34b rising upward from four sides of the bottom plate portion 34a. An upper filter housing groove 34 s extending along one direction is formed on the lower surface 34 c of the bottom plate portion 34 a of the upper member 34. A through hole 34h that forms the upper half of the injection hole 32 is formed on the upper surface of the upper filter housing groove 34s so as to penetrate the bottom plate portion 34a vertically. The width of the upper filter housing groove 34s is the same as that of the lower filter housing groove 33s, and is set larger than the opening diameter D of the through hole 33b by a certain dimension (for example, about 30 mm).

  As shown in FIGS. 2 and 3, the lower member 33 and the upper member 34 are integrated by a plurality of bolts 39 in a state where the upper surface 33 a of the lower member 33 and the lower surface 34 c of the upper member 34 are abutted with each other. It is concluded to. In this state, the lower filter housing groove 33s and the upper filter housing groove 34s form a filter passage 50 that penetrates the bottom 31a of the dam 31 along one direction.

  As shown in FIG. 2, the first filter 35 is inserted into such a filter passage 50. The first filter 35 has a belt shape and is fed out from a filter roll 36 in which the first filter 35 is wound in a roll shape. The drawn out first filter 35 is inserted from the end 50a on one side of the filter passage 50 toward the end 50b on the other side, and a part of the first filter 35 closes the injection hole 32 communicating with the gate 22a. Provided.

The feeding portion 37 is provided on the outer peripheral surface of the dam 31. The feeding portion 37 is provided adjacent to the end portion 50a on one side of the filter passage 50 on one side of the gate 22a.
The feeding unit 37 includes a box-shaped case 71, a support roller 72 that rotatably supports the filter roll 36, and a heater 40 that heats the first filter 35 that is fed from the filter roll 36.

The case 71 communicates with the end 50 a on one side of the filter passage 50 on the side facing the outer peripheral surface of the dam 31. In addition, an openable / closable door 73 is provided on the upper surface of the case 71. By opening the door 73, the filter roll 36 supported by the support roller 72 in the case 71 can be replaced.
The first filter 35 fed out from the filter roll 36 held by the support roller 72 is introduced into the filter passage 50 from the end 50 a of the filter passage 50.

  The heater 40 is, for example, an electric heater, and heats the first filter 35 fed into the filter passage 50 to, for example, the vicinity of the temperature of the molten metal M.

The winding portion 38 is provided on the outer peripheral surface of the dam 31 adjacent to the end portion 50b on the other side of the filter passage 50, which is the other side of the gate 22a.
The winding unit 38 includes a box-shaped case 81, a winding roller 82 that winds the first filter 35, and a drive source 82m such as a motor that rotationally drives the winding roller 82.

The case 81 communicates with the end 50 b on the other side of the filter passage 50 on the side facing the outer peripheral surface of the dam 31. A door 83 that can be freely opened and closed is provided on the upper surface of the case 81. By opening the door 83, the first filter 35 wound around the winding roller 82 can be collected in the case 81.
In the winding unit 38, the first filter 35 is sent along the filter passage 50 by driving the winding roller 82 at a constant speed or intermittently driving it at regular intervals. In the present embodiment, for example, it is assumed that the feeding is performed at a constant speed of about 1.2 Dcm / min with respect to the diameter Dcm of the gate 22a.

  As shown in FIGS. 2 and 3, fasteners 51 that hold the first filter 35 are provided on both ends in the width direction of the first filter 35 at both ends 50 a and 50 b of the filter passage 50. The fastener 51 includes, for example, guide members 51a and 51a arranged above and below the first filter 35. Each of the guide members 51a and 51a is urged toward the side approaching the first filter 35 by a spring (not shown) or the like. In this way, the first filter 35 is applied with tension by holding both ends in the width direction by the fasteners 51 and 51 at the one end 50a and the other end 50b of the filter passage 50, respectively. Sent in the state

  As shown in FIG. 1, the second filter 25 is provided at the downstream end of the runner 22, which is downstream of the first filter 35 in the flow direction of the molten metal M. .

Here, the 1st filter 35 has the softness | flexibility which can be wound up in roll shape, and the fire resistance in the temperature of the molten metal M. FIG. The molten metal M in the present embodiment is a non-ferrous metal such as a copper alloy or an aluminum alloy. As a material having fire resistance and flexibility at the molten metal temperature, for example, a glass fiber filter mainly composed of SiO ₂ is used. A material is preferred.
For example, the same material as the first filter 35 or a porous heat-resistant material can be used for the second filter 25.

The first filter 35 is set to have a larger mesh opening diameter than the second filter 25.
In the present embodiment, the mesh opening diameter of the first filter 35 is 5 mm, for example, and the mesh opening diameter of the second filter 25 is 2.5 mm, for example.

In order to perform casting in the mold apparatus 10 as described above, first, the molten metal injection apparatus 30 is installed on the mold body 20 in which the molding recess 21 having a predetermined shape is formed.
Next, the molten metal M is put into the dam 31. Then, the molten metal M is injected into the gate 22 a of the runner 22 through the injection hole 32 from the dam 31 provided on the gate 22 a of the mold body 20. The injected molten metal M passes through the first filter 35, the runner 22, and the second filter 25 and is injected into the molding recess 21.

  Foreign matter such as slag S contained in the molten metal M passes from the dam 31 to the molding recess 21 through the runner 22 and the second filter 25 having a large mesh opening diameter and the second filter 25 having a small mesh opening diameter. Are collected sequentially.

And after inject | pouring the predetermined amount of molten metal M into the shaping | molding recessed part 21, the molten metal M in the shaping | molding recessed part 21 is cooled and solidified. After the molten metal M is cooled and solidified, the cast product formed by the molding recess 21 is taken out.
In this way, a casting can be formed in the mold apparatus 10.

  According to the mold apparatus 10 described above, the first filter 35 having a large mesh opening diameter is provided so as to cover the injection hole 32 of the molten metal M, and the mesh opening diameter is further downstream than the first filter 35 in the flow direction of the molten metal M. A small second filter 25 is provided. Thereby, in molding recessed part 21, it can suppress that foreign materials, such as slag S, are caught in molten metal M, and can form a cast of good quality.

In addition, since the foreign matter having a large diameter is removed by the first filter 35 having a large mesh opening diameter, filter clogging is less likely to occur in the second filter 25 on the downstream side.
Furthermore, since the first filter 35 is drawn out from the winding unit 38, the first filter 35 covering the injection hole 32 can be updated sequentially, and the filter clogging in the first filter 35 is less likely to occur.
In this way, since the breakage of the first filter 35 and the second filter 25 can be suppressed, it is possible to reliably prevent the slag S from flowing into the mold due to the filter breakage.
As a result, the slag S can be reliably removed and maintenance can be easily performed.

  Further, since the first filter 35 is heated by the heater 40, it is possible to prevent the molten metal M contacting the first filter 35 at room temperature from being cooled and solidified and attached to the first filter 35.

In addition, in the said embodiment, since the molten metal injection | pouring apparatus 30 only needs to be installed on the casting_mold | template main body 20, this invention is applicable also to the existing casting_mold | template main body.
Moreover, the structure shown by the said embodiment is only an example, For example, it is set as another structure suitably about the structure of the casting_mold | template main body 20, the shape of the shaping | molding recessed part 21 according to the cast product to form, the material of the molten metal M, etc. You can also. For example, although the sand mold is used in the mold body 20, the present invention is not limited to this, and a mold may be used.

DESCRIPTION OF SYMBOLS 10 Mold apparatus 20 Mold main body 21 Molding recessed part 22 Runway 22a Spout 25 Second filter 30 Molten metal injection apparatus 31 Weir basin 32 Injection hole (injection port)
35 First filter (filter)
36 Filter roll 37 Feeding part 38 Winding part 40 Heater 50 Filter passage 51 Fastening M Molten metal S Slag

Claims (4)

A mold main body having a molding recess that forms a cast product by injecting a molten metal, and a runner that injects the molten metal into the molding recess;
A dam that stores the molten metal;
A band-shaped first filter that is provided so as to cover an inlet of the molten metal from the dam to the runway, and collects foreign matters in the molten metal,
In the runner, a second filter that is provided on the downstream side of the molten metal in the flow direction of the molten metal, and collects foreign matters in the molten metal,
A feeding section that is arranged on one side of the inlet and that feeds the first filter out of a filter roll formed by winding the first filter in a roll;
A winding portion that is disposed on the other side of the inlet and winds up the first filter that is fed out from the feeding portion;
The first filter is set to have a larger mesh opening diameter than the second filter,
The dam has a lower member, and an upper member installed above the lower member,
A lower filter housing groove extending in one direction on the upper surface of the lower member and an upper filter housing groove extending in one direction on the lower surface of the upper member are formed, and the upper surface and the upper portion of the lower member are formed. It abutted to the lower surface of the member, thus with the lower filter housing groove in the upper filter housing groove, the mold apparatus, wherein a filter passageway, wherein said first filter is inserted is formed. The mold apparatus according to claim 1, further comprising a heater for heating the first filter. A basin for storing molten metal injected into the mold,
Provided so as to cover the inlet to inject the molten metal into the mold from the weir pot, a filter for continuous strip,
A feed-out portion for feeding out the filter from a filter roll formed by winding the filter in a roll;
A winding unit that winds up the filter fed from the feeding unit;
With
The dam has a lower member, and an upper member installed above the lower member,
A lower filter housing groove extending in one direction on the upper surface of the lower member and an upper filter housing groove extending in one direction on the lower surface of the upper member are formed, and the upper surface and the upper portion of the lower member are formed. abutted to the lower surface of the member, depending on the said lower filter housing groove the upper filter housing groove, the molten metal injection apparatus characterized by filter passage the filter is inserted. A casting method in the mold apparatus according to claim 1 or 2,
Injecting the molten metal from the dam provided on the mold body into the molding recess through the first filter and the second filter;
After cooling and solidifying the molten metal, demolding the cast product formed by the molding recess;
A casting method comprising:

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