CN111482561B - Die casting device and die casting production method - Google Patents
Die casting device and die casting production method Download PDFInfo
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- CN111482561B CN111482561B CN202010322121.3A CN202010322121A CN111482561B CN 111482561 B CN111482561 B CN 111482561B CN 202010322121 A CN202010322121 A CN 202010322121A CN 111482561 B CN111482561 B CN 111482561B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/06—Ingot moulds or their manufacture
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/06—Ingot moulds or their manufacture
- B22D7/10—Hot tops therefor
- B22D7/106—Configuration of hot tops
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Abstract
The invention relates to a die casting device and a die casting production method, and belongs to the technical field of metal casting. According to the invention, one or two inward-protruding structures are arranged at the lower part of the inner cavity of the separated dead head shell, the protruding structures can play a transition role in the casting process, the lower end face of the heat insulation plate is a plane, and the lower end of the heat insulation plate is not provided with a chamfer structure, so that the problem that the refractory material is easily damaged and the ingot casting defect is caused due to the fact that the lower chamfer of the heat insulation plate is thinned in the prior art is solved. Meanwhile, the inner cavity of the heat insulation plate is provided with a protruding structure, and during demolding, the clamp can be inserted into the protruding position of the heat insulation plate, so that rapid demolding is realized, and the temperature of the cast ingot entering the heating furnace is increased. The invention can reduce the height of the riser by about 100mm without considering the solid height of the riser and reduce the cap volume ratio. The yield of the final cast ingot can be improved by 2-8%. The demolding time can be reduced by 10 to 20 minutes.
Description
Technical Field
The invention relates to a die casting device and a die casting production method, and belongs to the technical field of metal casting.
Background
In molding, there are integral risers and split risers and both designs. The integral riser refers to that a metal mold and the riser are integrated and is generally used for casting large steel ingots. The solidification time of the large steel ingot is long, and the required riser metal feeding amount is large, so that an integral riser with a larger volume is used; the separated riser is used for reducing the cap volume ratio and improving the metal yield, so that the separated riser with smaller volume is adopted.
After the steel ingot adopts the separated feeder head and the heat-insulating plate matched with the separated feeder head, the size difference of the intersection of the ingot body and the feeder head is large (30-100mm), and the folding defect is easy to generate during rolling, so that the position needs to be subjected to fillet or chamfer transition. At present, the transition between a steel ingot riser and an ingot body is realized by chamfering the bottom of a heat insulation plate, as shown in figure 1. However, since the chamfered part of the heat-insulating plate is thin, the heat-insulating plate is easily damaged after being contacted by high-temperature molten metal, so that defects (the lower left part in fig. 2) are formed at the transition position of the ingot body and the riser, cracks are generated during rolling, and the yield is greatly reduced.
In addition, after the ingot is completely solidified, the feeder head shrinks into a concave shape (the upper part of fig. 2), i.e. the upper part of the feeder head is not solid. When the metal mold is removed, the split-type riser head is adopted to cast the ingot, the end of the riser head is clamped by a clamp and lifted upwards, and the ingot is separated from the metal mold through the self weight of the metal mold. However, since the upper part of the riser is not solid, the upper part of the riser is easily deformed and cannot be demoulded when the clamp works; therefore, the solid height of the feeder head is required to be more than 100mm, so that the clamp can conveniently clamp the solid area. Therefore, the riser required in the field production is higher (about 300mm), and the yield is reduced. In addition, the service life of the tip of the clamp is limited, the clamp is easy to slip after being worn, a dead head cannot be clamped, the steel ingot is difficult to demould quickly, and the production efficiency is influenced.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the utility model provides a die casting device, when being applied to die casting production, can reduce the defect of ingot body and rising head transition position, improve drawing of patterns efficiency and yield simultaneously.
In order to solve the technical problems, the invention adopts the technical scheme that: the die casting device comprises a metal die and a riser, wherein the riser is arranged at the upper end of the metal die in a separable mode, the riser comprises an insulation board positioned in the riser and a riser shell positioned outside the riser, the lower end of the riser shell extends outwards to form a horizontally arranged mounting base, a first bulge annularly arranged is arranged at the lower end of an inner cavity of the riser shell, the lower end surface of the insulation board is in contact with the upper surface of the first bulge, and the contact surface of the insulation board and the first bulge is horizontally arranged; the tip end surface of the first bulge is an inclined surface with the same taper as the inner cavity surface of the heat insulation plate and is flush with the inner cavity surface of the heat insulation plate; the lower surface of the first bulge is a rounded surface or a chamfer surface; the insulation boards on two sides which are oppositely arranged are provided with bulges, the bulges are positioned on one side of the insulation board facing to the center of the riser, and the bulges of the insulation boards on two sides of the riser are symmetrically arranged by taking the central line of the riser as an axis.
Further, the method comprises the following steps: the lower surface of the first bulge is a chamfer surface, one end of the chamfer surface is connected with the lower surface of the mounting base of the riser shell, and the other end of the chamfer surface is connected with the tip end surface of the first bulge; the included angle between the chamfer surface and the inner cavity surface of the dead head shell is set as alpha, and the value of the alpha is 20-50 degrees.
Further, the method comprises the following steps: along the taper direction of the first bump tip end face, the linear length of the first bump tip end face in the direction is 10-30 mm; the width of the upper surface of the first bulge in the horizontal direction is set to be L1, and the value of L1 is 30-80 mm; the vertical height of the first protrusion is set to be L2, L2 refers to the distance between the upper end contour line and the lower end contour line of the first protrusion on the inner cavity surface of the feeder cap on the vertical plane, and L2 is 40-80 mm.
Further, the method comprises the following steps: the cross section of the inner cavity of the metal mold is rectangular, the heat insulation plates are distributed in a rectangular mode, and one heat insulation plate is arranged on each side of the rectangular distribution line; the heat insulating plate protrusions are provided on both wide surface sides of the metal mold. In addition, the heat insulation plate on each side may be provided with heat insulation plate protrusions.
Further, the method comprises the following steps: the distance between the center of the heat insulation plate bulge and the center of the heat insulation plate is 0-40 mm; the height of the heat insulation plate bulge is 20 mm-80 mm; the diameter of the cross section of the heat insulation plate bulge is 50 mm-100 mm.
Further, the method comprises the following steps: the vertical height of the heat insulation plate is 200 mm-300 mm.
Further, the method comprises the following steps: the heat insulation plate is provided with a hole, a small heat insulation plate is inserted into the hole, and the end part of the small heat insulation plate is arranged in a protruding mode relative to the inner wall of the heat insulation plate so as to form the heat insulation plate bulge.
Further, the method comprises the following steps: the lower surface of the mounting base of the riser shell is provided with second protrusions which are annularly arranged, the second protrusions are arranged in the inner cavity of the metal mold, and one side surface of each second protrusion is attached to the inner cavity surface of the metal mold.
Further, the method comprises the following steps: the longitudinal section of the second bulge is trapezoidal, and one side surface of the second bulge facing to the center of the inner cavity of the metal mold is an inclined surface; an acute angle is formed between the inclined plane and the outer end of the lower surface of the mounting base of the riser shell, the acute angle is set to be beta, and the value of the beta is 40-70 degrees; the horizontal width of the bottom end of the second bulge is set to be L3, the bottom end of the second bulge is the end connected with the lower surface of the mounting base of the feeder head shell, and the value of L3 is 30-60 mm; the height of the second protrusion is set to be L4, L4 refers to the distance between the tip end face of the second protrusion and the lower surface of the mounting base of the feeder head shell on a vertical plane, and the value of L4 is 20-60 mm.
Further, the method comprises the following steps: the dead head shell, the first bulge and the second bulge are of an integrated structure made of cast iron.
Correspondingly, on the basis of the die casting device, the invention also provides a die casting production method, and in the casting process, when the molten steel rises to be in contact with a riser shell, the casting speed is reduced to 1/15-1/3 of the casting speed of the ingot body; when pouring, the metal ingot forms a pit at the corresponding position of the heat insulation plate bulge, and the pit can allow the clamp to be inserted; after the pouring is finished, firstly hoisting the dead head shell; and inserting the metal ingot into the corresponding position of the heat insulation plate protrusion by the clamp, lifting the metal ingot, and demolding by the self weight of the metal mold.
Further, the method comprises the following steps: before casting, firstly baking the metal mold, the dead head shell and the heat insulation plate to 60-250 ℃; the height of riser molten steel is 150 mm-300 mm during pouring; when casting, the casting speed of the ingot body is 0.2 m/s-0.4 m/s, and when the molten steel rises to be in contact with a riser shell, the casting speed is reduced to 0.02 m/s-0.04 m/s.
The invention has the beneficial effects that: the lower part of the inner cavity of the separated riser shell is of one or two structures protruding inwards, the lower end of the first protrusion is a chamfer or a fillet, the upper end of the first protrusion is attached to the lower end face of the heat insulation plate, and the second protrusion is of a trapezoidal section and is attached to the inner cavity surface of the metal mold; the bulge structure can play a transition role in the pouring process, the lower end face of the heat insulation plate is a plane, and the lower end of the heat insulation plate is not provided with a chamfer structure, so that the problems that the refractory material is easy to damage and the ingot casting defect is caused due to the fact that the lower chamfer of the heat insulation plate is thinned in the prior art are solved.
In addition, the heat insulation plate can be pulverized after pouring is finished, the heat insulation plate generally partially falls off in the process of lifting the dead head shell, then the clamp can be easily inserted into the corresponding position of the metal ingot on the heat insulation plate in a protruding mode due to the fact that the heat insulation plate is pulverized, a concave pit is formed in the position, and after the clamp is inserted into the concave pit, clamping force can be increased, and demolding and sliding are avoided.
When the invention is used for demoulding, the clamp can be inserted into the position of the small heat insulation plate so as to realize quick demoulding and improve the temperature of the cast ingot entering the heating furnace. Meanwhile, the solid height of the riser is not considered, the height of the riser is reduced by about 100mm, and the cap volume ratio is reduced. In addition, due to the fact that the heat insulation plate bulges are arranged, in the pouring process, the heat resistance of the position is larger, solidification of molten steel is slowed down, feeding of cast ingots is facilitated, and the internal quality is improved. In the pouring process, the pouring speed is reasonably designed, the riser head speed is reduced, the damage of the bulge caused by thermal shock of high-temperature molten steel can be avoided, meanwhile, the solidification speed of the riser head is reduced, and the feeding time of the cast ingot is prolonged.
The yield of the final cast ingot can be improved by 2-8%. The demolding time can be reduced by 10 to 20 minutes.
Drawings
FIG. 1 is a schematic diagram of a prior art die casting of a breakaway riser;
FIG. 2 is a schematic view of a prior art ingot riser showing defects and shrinkage;
FIG. 3 is a schematic view of the die casting assembly of the present invention;
FIG. 4 is a schematic illustration of a feeder head shell according to the present invention;
FIG. 5 is a schematic view of the construction of the heat insulating panel according to the present invention;
labeled as: the device comprises a metal mold 1, an insulation board 2, a dead head shell 3, a small insulation board 4, a metal ingot 5 and a weak part 6 at the lower part of the insulation board.
Detailed Description
The invention is further explained below with reference to the drawings and examples.
As shown in fig. 3 and 4, the die casting device of the present invention comprises a metal mold 1 and a riser, wherein the riser is detachably disposed at the upper end of the metal mold 1, the riser comprises an insulation plate 2 disposed inside the riser and a riser housing 3 disposed outside the riser, the lower end of the riser housing 3 extends outwards to form a horizontally disposed mounting base, the lower end of the inner cavity of the riser housing 3 is provided with a first protrusion annularly disposed, the lower end surface of the insulation plate 2 contacts with the upper surface of the first protrusion, and the contact surface of the two protrusions is horizontally disposed; the tip end face of the first bulge is an inclined plane with the same taper as the inner cavity face of the heat insulation plate 2 and is flush with the inner cavity face of the heat insulation plate 2; the lower surface of the first bulge is a rounded surface or a chamfer surface; the insulation boards 2 on two sides which are oppositely arranged are provided with bulges, the bulges are positioned on one side of the insulation boards 2 facing the center of the riser, and the bulges of the insulation boards on two sides of the riser are symmetrically arranged by taking the central line of the riser as an axis. The main functions of the heat insulation plate bulge are as follows: when pouring, the metal ingot forms a pit at the corresponding position of the heat insulation plate bulge, and the pit can allow the clamp to be inserted, so that the clamping force is increased. The feeder head housing 3 is typically made of cast iron, and accordingly, the first protrusion is made of cast iron, preferably, in a form of being integrally formed with the feeder head housing 3. First arch can play the transition effect in the pouring process to the lower terminal surface of heat-insulating board 2 is the plane, and 2 lower extremes of heat-insulating board no longer set up the chamfer structure, has avoided 2 lower part chamfers attenuate of former heat-insulating board like this to cause the easy damage of resistant material, lead to the problem of ingot casting defect.
For better technical effect, the preferred structural form and dimensional parameters of the first protrusion are designed as follows: the lower surface of the first bulge is a chamfer surface, one end of the chamfer surface is connected with the lower surface of the mounting base of the riser shell 3, and the other end of the chamfer surface is connected with the tip end surface of the first bulge; the included angle between the chamfer surface and the inner cavity surface of the dead head shell 3 is set as alpha, and the value of the alpha is 20-50 degrees. Along the taper direction of the first bump tip face, the linear length of the first bump tip face in the direction is 10mm to 30 mm. The width of the upper surface of the first protrusion in the horizontal direction is set to be L1, and the value of L1 is 30-80 mm. The vertical height of the first protrusion is set to be L2, L2 refers to the distance between the upper end contour line and the lower end contour line of the first protrusion on the inner cavity surface of the feeder cap 3 in the vertical plane, and the value of L2 is 40-80 mm.
The invention is preferably suitable for casting blanks with rectangular sections, the cross section of the inner cavity of the metal mold 1 is rectangular, the heat insulation plates 2 are distributed in a rectangular manner, and one heat insulation plate 2 is arranged on each side of a rectangular distribution line; the heat insulating plate projections are provided on both wide surface sides of the metal mold 1. The wide surface side is referred to as a relatively narrow surface side. The narrow side face can adopt a common flat plate structure, and the heat insulation plate bulges can also be symmetrically arranged, namely the heat insulation plates 2 on the four sides are all provided with the heat insulation plate bulges.
For better technical effect, the preferred arrangement of the insulation plate protrusions is as follows: the distance between the center of the heat insulation plate bulge and the center of the heat insulation plate 2 is 0-40 mm. The height of the heat insulation plate bulge is 20 mm-80 mm. The diameter of the cross section of the heat insulation plate bulge is 50 mm-100 mm. The vertical height of the heat insulation plate 2 after installation is 200-300 mm, and the design can be carried out according to different riser heights.
For the convenience of assembly, as shown in fig. 3 and 5, the preferred structural form of the insulation plate 2 is: the heat insulation plate 2 is provided with holes (square holes, round holes, elliptical holes, triangles and other shapes, the size of each hole is larger than that of a clamp, the diameter of each hole is generally 50-100 mm), small heat insulation plates 4 are inserted into the holes, and the end parts of the small heat insulation plates 4 are arranged in a protruding mode relative to the inner wall of the heat insulation plate 2 to form the heat insulation plate bulges. The holes on the heat insulation plate 2 are generally in a through hole structure and form clearance fit with the small heat insulation plate 4 so as to facilitate the insertion of the small heat insulation plate 4, and the diameter difference between the two is generally 1 mm-3 mm, namely the sum of the two side clearances is 1 mm-3 mm. One end of the small heat insulation plate 4 is flush with the end face of the through hole of the heat insulation plate 2, and the convex height of the other end is 20-80 mm.
In order to form more molten steel pouring transition layers, the lower surface of the mounting base of the riser shell 3 is provided with second protrusions which are annularly arranged, the second protrusions are arranged in the inner cavity of the metal mold 1, and one side surface of each second protrusion is attached to the inner cavity surface of the metal mold 1.
For better technical effect, the preferred structural form and dimensional parameters of the second protrusion are designed as follows: the longitudinal section of the second bulge is trapezoidal, and one side surface of the second bulge facing the center of the inner cavity of the metal mold 1 is an inclined surface; an acute angle is formed between the inclined plane and the outer end of the lower surface of the mounting base of the dead head shell 3, the acute angle is set to be beta, and the value of the beta is 40-70 degrees; the horizontal width of the bottom end of the second bulge is set to be L3, the bottom end of the second bulge is the end connected with the lower surface of the mounting base of the feeder head shell 3, and the value of L3 is 30-60 mm; the height of the second protrusion is set to be L4, L4 refers to the distance between the tip end surface of the second protrusion and the lower surface of the mounting base of the feeder head shell 3 in the vertical plane, and the value of L4 is 20-60 mm. The dead head shell 3, the first bulge and the second bulge are of an integrated structure made of cast iron.
On the basis of the die casting device, the invention also provides a die casting production method, in the casting process, when the molten steel rises to be in contact with the riser shell 3, the casting speed is reduced to 1/15-1/3 of the casting speed of the ingot body (when the molten steel rises to be in contact with the riser shell 3, the casting speed refers to the riser casting speed). When pouring, the metal ingot 5 forms a pit at the corresponding position of the heat insulation plate bulge, and the pit can allow the clamp to be inserted; after the pouring is finished, hoisting the dead head shell 3; the clamp is inserted into the metal ingot 5 at the corresponding position of the heat insulation plate protrusion, the metal ingot 5 is lifted, and the mold is released by the self weight of the metal mold 1.
The preferable mode is that before casting, the metal mold 1, the dead head shell 3 and the heat insulation plate 2 are baked to 60-250 ℃; the height of riser molten steel is 150 mm-300 mm during pouring; when pouring, the pouring speed of the ingot body is 0.2-0.4 m/s, when the molten steel rises to be in contact with the cap opening shell 3, the pouring speed is reduced to 0.02-0.04 m/s, the thermal shock of the high-temperature molten steel to the bulge is favorably relieved, and the service life is prolonged; and meanwhile, the filling time of the riser is prolonged, so that the feeding effect of the riser is increased, and the quality of the casting blank is improved.
Example 1: pouring 3t ingots of Cr12MoV steel; the implementation mode is as follows:
the lower end of the inner cavity of the riser shell 3 is provided with a first bulge which is annularly arranged. The dimensional parameters of the first bump are as follows: the value of L1 is 60mm, and the value of L2 is 50mm, the lower surface chamfer angle or the fillet of first arch, and the angle of alpha is 50, and the tip of first arch is a small corner cut, forms the inclined plane that flushes with the inner chamber face of heat-insulating board 2, and the side cut is long 15mm (promptly the linear length of the tip face of first arch on its incline direction is 15 mm). The dead head shell 3 and the first bulge are of an integrated structure made of cast iron.
The cross section of the inner cavity of the metal mold 1 is rectangular, the cross section of the inner cavity of the riser shell 3 is also rectangular, four heat insulation plates 2 are arranged in the inner cavity of the riser shell 3, one heat insulation plate is arranged on each side of each heat insulation plate, the bottom of each heat insulation plate 2 is placed on the upper surface of the corresponding first protrusion, and the bottom of each heat insulation plate 2 is a plane and is not provided with a chamfer.
The heat insulation plates 2 are structurally characterized in that a round hole with the diameter of 80mm is formed in the middle of each heat insulation plate 2, and the center of each hole is 80mm away from the bottom of the heat insulation plate (the center of each hole is 40mm away from the center of the heat insulation plate 2); and a small heat insulation plate 4 is inserted into the hole of each heat insulation plate 2, and the small heat insulation plate 4 adopts a cylindrical structure with the diameter of 78 mm. After the small insulation plate 4 was inserted into the hole, an insulation plate protrusion having a height of 30mm was formed in the cavity of the riser.
Before casting, firstly baking the metal mold 1, the dead head shell 3 and the heat insulation plate 2 to 80 ℃; when pouring, the pouring speed of the ingot body is 0.197m/s, and the pouring speed of the riser is 0.034 m/s; the height of molten steel of the riser is 170mm, the riser shell 3 is lifted after pouring is finished, the clamp is inserted into the metal ingot 5 at the corresponding position of the bulge of the heat insulation plate, the metal ingot 5 is lifted to be demolded, and one-time demolding is successful. The transition between the metal ingot body and the riser is good, and no quality defect exists; the demoulding time is reduced by 10 minutes, and the yield is improved by 6 percent after rolling.
Example 2: pouring 3.2t of flat ingots of Cr12 steel; the implementation mode is as follows:
the lower end of the inner cavity of the riser shell 3 is provided with a first bulge which is annularly arranged. The dimensional parameters of the first bump are as follows: the value of L1 is 50mm, and the value of L2 is 50mm, the lower surface chamfer angle or the fillet of first arch, and the angle of alpha is 55, and the tip of first arch is a small corner cut, forms the inclined plane that flushes with the inner chamber face of heat-insulating board 2, and the side cut is long 25mm (promptly the linear length of the tip face of first arch on its incline direction is 25 mm).
The lower surface of the mounting base of the riser shell 3 is provided with second bulges which are annularly arranged, the second bulges are arranged in the inner cavity of the metal mold 1, and one side surface of each second bulge is attached to the inner cavity surface of the metal mold 1; the longitudinal section of the second bulge is trapezoidal, and the size parameters are as follows: the height L4 takes the value 40mm, the width L3 takes the value 40mm, and the angle β is 45 °.
The dead head shell 3, the first bulge and the second bulge are of an integrated structure made of cast iron.
The cross section of the inner cavity of the metal mold 1 is rectangular, the cross section of the inner cavity of the riser shell 3 is also rectangular, four heat insulation plates 2 are arranged in the inner cavity of the riser shell 3, one heat insulation plate is arranged on each side of each heat insulation plate, the bottom of each heat insulation plate 2 is placed on the upper surface of the corresponding first protrusion, and the bottom of each heat insulation plate 2 is a plane and is not provided with a chamfer.
The heat insulation plate 2 has a structure that the narrow side adopts the heat insulation plate 2 without the opening, the middle part of the heat insulation plate 2 with the wide side is respectively opened with a square hole of 70mm multiplied by 70mm, the center of the opening is 100mm away from the bottom of the heat insulation plate 2 (the center of the opening is 30mm away from the center of the heat insulation plate 2), the square hole is used for inserting the small heat insulation plate 4, and the small heat insulation plate 4 is a square section of 68mm multiplied by 68 mm. After the small insulation plate 4 was inserted into the hole, an insulation plate protrusion having a height of 35mm was formed in the cavity of the riser.
Before casting, firstly baking the metal mold 1, the dead head shell 3 and the heat insulation plate 2 to 75 ℃; when pouring, the pouring speed of the ingot body is 0.197m/s, and the pouring speed of the riser is 0.036 m/s; and the height of molten steel of the riser is 150mm, the riser shell 3 is lifted after pouring, the clamp is inserted into the metal ingot 5 at the corresponding position of the bulge of the heat insulation plate, the metal ingot 5 is lifted to be demolded, and one-time demolding is successful. The transition between the metal ingot body and the riser is good, and no quality defect exists; the demoulding time is reduced by 20 minutes, and the yield is improved by 8 percent after rolling.
Claims (8)
1. Die casting device, including metal mould (1) and rising head, the rising head sets up the upper end at metal mould (1) with separable mode, and the rising head is including being located inside heat-insulating board (2) and being located its outside rising head shell (3), and the outside installation base that forms horizontal arrangement that extends of rising head shell (3) lower extreme, its characterized in that: the lower end of the inner cavity of the riser shell (3) is provided with a first bulge which is annularly arranged, the lower end surface of the heat insulation plate (2) is in contact with the upper surface of the first bulge, and the contact surface of the first bulge and the contact surface of the heat insulation plate are horizontally arranged; the tip end face of the first bulge is an inclined plane with the same taper as the inner cavity face of the heat insulation plate (2) and is flush with the inner cavity face of the heat insulation plate (2); the lower surface of the first bulge is a rounded surface or a chamfer surface; the lower surface of the mounting base of the riser shell (3) is provided with second bulges which are annularly arranged, the second bulges are arranged in the inner cavity of the metal mold (1), and one side surface of each second bulge is attached to the inner cavity surface of the metal mold (1); the longitudinal section of the second bulge is trapezoidal, and one side surface of the second bulge facing the center of the inner cavity of the metal mold (1) is an inclined surface; an acute angle is formed between the inclined plane and the outer end of the lower surface of the mounting base of the dead head shell (3), the acute angle is set to be beta, and the value of the beta is 40-70 degrees; the horizontal width of the bottom end of the second bulge is set to be L3, the bottom end of the second bulge is the end connected with the lower surface of the mounting base of the feeder head shell (3), and the value of L3 is 30-60 mm; the height of the second protrusion is set to be L4, L4 refers to the distance between the tip end surface of the second protrusion and the lower surface of the mounting base of the feeder head shell (3) on a vertical plane, and the value of L4 is 20-60 mm; the riser shell (3), the first bulge and the second bulge are of an integrated structure made of cast iron;
the insulation boards (2) on two sides which are oppositely arranged are provided with bulges, the bulges are positioned on one side of the insulation boards (2) facing to the center of the riser, and the bulges of the insulation boards on two sides of the riser are symmetrically arranged by taking the central line of the riser as an axis.
2. The die casting device of claim 1, wherein: the lower surface of the first bulge is a chamfer surface, one end of the chamfer surface is connected with the lower surface of the mounting base of the riser shell (3), and the other end of the chamfer surface is connected with the tip end surface of the first bulge; the included angle between the chamfer surface and the inner cavity surface of the dead head shell (3) is set as alpha, and the value of the alpha is 20-50 degrees.
3. The die casting device of claim 1, wherein: along the taper direction of the first bump tip end face, the linear length of the first bump tip end face in the direction is 10-30 mm; the width of the upper surface of the first bulge in the horizontal direction is set to be L1, and the value of L1 is 30-80 mm; the vertical height of the first protrusion is set to be L2, L2 refers to the distance between the upper end contour line and the lower end contour line of the first protrusion on the inner cavity surface of the feeder cap (3) in the vertical plane, and L2 is 40-80 mm.
4. The die casting device of claim 1, wherein: the cross section of the inner cavity of the metal mold (1) is rectangular, the heat insulation plates (2) are distributed in a rectangular mode, and one heat insulation plate (2) is arranged on each side of a rectangular distribution line; the arrangement mode of the heat insulation plate bulges is one of the following two modes: the heat insulation plate protrusions are arranged on two wide surface sides of the metal mold (1), or the heat insulation plate (2) on each side is provided with the heat insulation plate protrusions.
5. The die casting device of claim 1, wherein: the distance between the center of the heat insulation plate bulge and the center of the heat insulation plate (2) is 0-40 mm; the height of the heat insulation plate bulge is 20 mm-80 mm; the diameter of the cross section of the heat insulation plate bulge is 50-100 mm; the vertical height of the heat insulation plate (2) is 200 mm-300 mm.
6. The die casting device of claim 1, wherein: the heat insulation plate (2) is provided with a hole, a small heat insulation plate (4) is inserted into the hole, and the end part of the small heat insulation plate (4) is arranged in a protruding mode relative to the inner wall of the heat insulation plate (2) to form the heat insulation plate bulge.
7. The die casting production method is characterized in that: a die-casting device according to any one of claims 1 to 6, and comprising the steps of: in the casting process, when the molten steel rises to be in contact with the riser shell (3), the casting speed is reduced to 1/15-1/3 of the casting speed of the ingot body; when pouring, the metal ingot (5) forms a pit at the corresponding position of the heat insulation plate protrusion, and the pit can allow a clamp to be inserted; after the pouring is finished, hoisting the dead head shell (3); the clamp is inserted into the metal ingot (5) at the corresponding position of the heat insulation plate protrusion, the metal ingot (5) is lifted, and the mold is released through the self weight of the metal mold (1).
8. A die-casting production method according to claim 7, characterized in that: before casting, firstly baking the metal mold (1), the dead head shell (3) and the heat insulation plate (2) to 60-250 ℃; the height of riser molten steel is 150 mm-300 mm during pouring; when pouring, the pouring speed of the ingot body is 0.2 m/s-0.4 m/s, and when the molten steel rises to be in contact with the riser shell (3), the pouring speed is reduced to 0.02 m/s-0.04 m/s.
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