CN203599476U

CN203599476U - Metal mold and metal mold casting device

Info

Publication number: CN203599476U
Application number: CN201320653155.6U
Authority: CN
Inventors: 吴克建
Original assignee: XUSHUI XINGHUA CASTING CO Ltd
Current assignee: Hebei Xinghua Cast Pipe Co ltd
Priority date: 2013-10-23
Filing date: 2013-10-23
Publication date: 2014-05-21
Anticipated expiration: 2023-10-23

Abstract

The utility model discloses a metal mold and a metal mold casting device. The metal mold comprises a first half mold and a second half mold which are processed from low-carbon structural steel with a uniform metallic structure, wherein a cavity for formation of the shape of a casting during casting, pouring gates, a runner, fixed supporting pins and a parting surface are arranged on the first half mold and the second half mold correspondingly; the cavity is a concave cavity matching with the shape of the external surface of the casting and accommodates a sand core which is used for limiting the interior surface shape and wall thickness of the casting; a positioning part, which is used for positioning the relative position between the sand core and the cavity, is arranged above the cavity; the pouring gates are formed above the first half mold and the second half mold correspondingly; the runners are communicated with the pouring gates and extend into the cavity from the upper part of the cavity. The metal mold and the metal casting device comprising the same can shorten casting time, realize rapid filling and formation, and improve yield.

Description

Metal mold and metal mold casting equipment

Technical Field

The utility model relates to a metal casting field, in particular to metal mold mould and metal mold casting equipment.

Background

The metal mold casting process is a technology which is gradually developed and more widely applied in recent years, has the advantages of high production efficiency, small occupied area of a production field, low technical requirement on operators, easy formation of a mechanical assembly line and suitability for large-scale batch production.

The existing casting machine is relatively complex in structure, and mainly comprises that the whole mechanical action is controlled by hydraulic pressure and electricity, and each machine is provided with a hydraulic work station with a larger volume. The method is mainly used for casting nonferrous metals with lower temperature in the past. The high-temperature casting machine is used for casting high-temperature cast iron castings, the operating temperature and the ambient temperature are high, the hydraulic oil temperature is too high, electrical accessories are easy to damage, the equipment failure rate is high, and the hydraulic pipe is easily burnt by splashed high-temperature molten iron. The hydraulic transmission has slower action speed and low production efficiency.

At present, the thin-wall gray cast iron pipe fitting is produced by adopting the metal mold with the existing structural form, because molten iron is easy to cool and solidify in the casting process, the traditional casting method that the casting is horizontally arranged in the cavity is adopted, the casting is easy to solidify when the molten iron is not completely filled in the cavity, and therefore, the phenomena of insufficient casting and difficult forming of the casting due to the fact that the molten iron solidifies quickly, and waste products are caused.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a metal mold and be provided with metal mold casting equipment of this metal mold can shorten the casting time, and sufficient shaping is taken shape fast, improves the yield.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

on one hand, the utility model provides a metal mold which is arranged on metal mold casting equipment and comprises a first half mold and a second half mold which are processed by low-carbon structural steel with uniform metal structure; the first half mould and the second half mould are correspondingly provided with: the casting mold comprises a cavity, a pouring gate, a fixed support leg and a parting surface, wherein the cavity, the pouring gate, the fixed support leg and the parting surface are used for forming the appearance of a casting during casting; the cavity is a concave cavity matched with the shape of the outer surface of the casting, and is provided with a sand core for limiting the shape and the wall thickness of the inner surface of the casting; a positioning part for positioning the relative position between the sand core and the cavity is arranged above the cavity; the pouring gates are respectively and correspondingly arranged above the first half mould and the second half mould, and the pouring gate is communicated with the pouring gates and extends into the cavity from the upper part of the cavity; the first half mould and the second half mould are respectively and relatively and fixedly connected to the metal mold casting equipment through respective fixing support legs; the parting plane keeps vertical state, and when first half mould and second half mould were closed, the parting plane was laminated each other.

Further, in the above apparatus, the low-carbon structural steel is Q235 hot-rolled ordinary low-carbon structural steel, and the carbon content thereof is in the range of 0.12% to 0.22%.

Further, in the above device, the inner surface of the cavity is coated with a heat insulating layer.

Furthermore, in the above device, the positioning part includes a positioning core slot and a sand core positioning slot, and the positioning core slot is a positioning core head of the sand core and the cavity; the sand core positioning groove is used for positioning the relative position between the main body of the sand core and the cavity;

and a positioning flange is arranged on the sand core, and the shape of the positioning flange is matched with the shape of the inner wall of the sand core positioning groove.

Further, in the above apparatus, the first mold half and the second mold half are further provided with: the positioning pin hole and the positioning pin are used for keeping the relative positions of the two half dies from shifting when the two half dies are closed; the position and the size of the positioning pin hole on the first half die are correspondingly matched with those of the positioning pin on the second half die; and the positions and the sizes of the positioning pins on the first half die are correspondingly matched with those of the positioning pin holes on the second half die.

Further, in the above apparatus, when the first mold half and the second mold half are closed, the gate has a shape of a cavity with a flared upper portion and a cylindrical lower portion; and/or the upper part of the pouring channel is communicated with the pouring gate cylinder, and the lower part of the pouring channel is communicated with the cavity; wherein the pouring channel is a concave flat groove processed according to the required size of the casting process.

Compared with the prior art, the utility model has the advantages of as follows:

the utility model discloses a metal mold comprises a pair of two halves mould, adopts perpendicular somatotype, and the runner setting is in the mould top, waters and extends the entering die cavity from the upper portion of die cavity. When the two half molds are closed, the parting surfaces are completely attached to form a cavity for molding the casting. The vertical parting and pouring system arrangement mode of the metal mold is beneficial to the rapid filling and forming of molten iron in the narrow gap between the cavity and the sand core under the action of gravity. Compare with current upper portion formula runner that drenches, the utility model discloses a metal mold mould can shorten the casting time, avoids watering not enough phenomenon because of the foundry goods that fills type time overlength and appear, has improved the yield.

On the other hand, the utility model also provides a metal mold casting equipment, this metal mold casting equipment includes: a frame, a fixed die plate, a movable die plate guide shaft, a die assembly device and any one of the metal molds; the first half mold and the second half mold are respectively and correspondingly arranged on the fixed mold plate and the movable mold plate; the fixed template is arranged on the rack, and the movable template guide shaft is arranged between the rack and the fixed template and penetrates through the movable template; one end of the mold closing device is installed on the rack, and the other end of the mold closing device is installed on the movable mold plate; and under the drive of the mold closing device, the movable mold plate reciprocates on the guide shaft of the movable mold plate to complete the mold opening and closing action.

Further, in the above apparatus, the mold clamping device is a pneumatic mold clamping device, a manual or electric screw mold clamping device.

Further, in the above apparatus, the frame includes: the pneumatic mould closing device comprises a horizontal steel section frame and a vertical reinforcing steel plate for fixing the pneumatic mould closing device; the horizontal steel frame and the vertical reinforcing steel plate are welded or integrally formed; and/or the number of the movable template guide shafts is at least more than two, and the movable template guide shafts are installed by selecting more than two shaft holes which are distributed diagonally according to the requirement of convenient operation and are fastened through nuts.

Further, in the above device, the fixed die plate is vertically connected to the horizontal steel frame; and/or more than two through holes for fixing the metal mold are respectively formed in the fixed mold plate and the movable mold plate.

the utility model discloses a metal mold casting equipment adopts pneumatic drive control, to pouring pipeline central gas feed, only needs the air supply and need not the power, has characteristics such as simple structure, equipment area are little, equipment action is fast, production efficiency is high, loading and unloading mould is swift, especially is suitable for mechanized casting production line production very much.

Additionally, the utility model relates to a metal mold casting equipment easy maintenance, easy and simple to handle make its fault rate greatly reduced to reduction production operation cost is low, very is convenient for constitute mechanized automatic casting production line.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

FIG. 1 is a schematic structural view of a metal mold casting apparatus according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a metal mold in an embodiment of the present invention.

Description of the reference numerals

1 Metal mold casting apparatus

2 Metal mould

21 first half mould

22 second half-mould

3 Sand core

4 casting

5 machine frame

6 fixed die spanner

7 template

8 moving die plate guide shaft

9 pneumatic mold closing device

10 die cavity

11 pouring gate

12 pouring channel

13 positioning core slot

14 positioning pin hole

15 positioning pin

16 fixed support leg

17 sand core positioning groove

18 parting plane

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

The basic idea of the utility model is that: a metal mould and a metal mould casting device using the metal mould are designed, the metal mould is composed of a pair of two half moulds, a vertical parting mode is adopted, a pouring gate is arranged above the moulds, and a pouring gate extends from the upper part of a cavity to enter the cavity. When the two half molds are closed, the parting surfaces are completely attached to form a cavity for molding the casting. The vertical parting and pouring system arrangement mode of the metal mold is beneficial to the rapid filling and forming of molten iron in the narrow gap between the cavity and the sand core under the action of gravity.

The metal mold casting equipment adopts pneumatic drive control, and supplies gas to the pouring pipeline in a centralized way without a power supply. The utility model discloses a metal mold casting equipment is suitable for mechanized casting production line production, and production efficiency is high, and equipment area is little, and the fault rate greatly reduced adopts pneumatic drive control, and equipment action is rapid, and production efficiency is high.

The preferred embodiments of the present invention will be further described with reference to the accompanying drawings:

metal mold embodiment

Referring to fig. 1, there is shown a metal mold structure of the present embodiment, which is used for a metal mold casting apparatus in the present embodiment. Referring to fig. 2, there is shown the structure of a metal mold casting apparatus using the metal mold of the present embodiment.

In this embodiment, the metal mold includes: a first half-mould 21 and a second half-mould 22; the first half-mold 21 and the second half-mold 22 are correspondingly provided with: a cavity 10 for forming the outer shape of a casting at the time of casting, a gate 11, a runner 12, a fixing leg 16, and a parting surface 18.

Wherein, the die cavity 10 is a concave cavity matched with the shape of the outer surface of the casting. The gates 11 are respectively disposed above the first and second mold halves 21 and 22, and the runners 12 communicate with the gates 11 and extend from an upper portion of the cavity 10 into the cavity 10. The parting surface 18 is kept in a vertical state, and when the first half mold 21 and the second half mold 22 are closed, the parting surface 18 is bonded to each other.

In the above embodiment, the gate 11 is disposed above the metal mold according to the casting process requirement of the casting 4, when the two molds are closed, the two molds have a cavity with a trumpet-shaped upper portion and a cylindrical lower portion, the runner 12 is a concave flat groove processed according to the casting process requirement of the casting 4, the upper portion is communicated with the gate 11 cylinder, the lower portion is communicated with the cavity 10 of the metal mold 2, when casting, molten iron is poured from the gate 11, and flows into and fills the gap between the cavity 10 and the sand core body 19 of the sand mold 3 through the runner 12, so as to form the solid body of the casting 4.

In this embodiment, the first mold half 21 and the second mold half 22 are relatively fixedly connected to the metal mold casting apparatus via respective fixing legs 16.

For example, the fixing legs 16 of the metal mold 2 are rectangular steel plates welded to both sides of the metal mold 2, and the two halves of the metal mold 2 are respectively fixed to the metal mold casting apparatus by fastening bolts or pressing the fixing legs 16 with a pressing plate.

In a preferred embodiment, the first half-mould 21 and the second half-mould 22 are further provided with: and a positioning core groove 13 for fixing the relative position of the sand core in the cavity 10, wherein the positioning core groove 13 is arranged above the cavity 10.

In the above embodiment, the cavity 10 is a concave cavity matching with the shape of the outer surface of the casting 4 to form the shape of the casting during casting. The positioning core slot 13 is a concave cavity matched with the shape of the outer surface of the positioning core head 20 of the sand core 3, and is used for fixing the relative position of the sand core 3 in the metal mold 2 so as to ensure that the casting 4 meets the wall thickness requirement specified by design.

In the above examples, the low-carbon structural steel was Q235 hot-rolled ordinary low-carbon structural steel, and the carbon content thereof was in the range of 0.12% to 0.22%. Because of the damage of the ferroalloy metal at high temperatures, in addition to being melted at high temperatures, structural cracking is caused mainly by thermal stress expansion of the metal at high temperatures. The stress failure is determined by the high-temperature heat deformation resistance of the structure components of the metal material, namely, the expansion deformation is small at high temperature, and the material has certain plasticity, is not easy to harden and crack. The other aspect is determined by the metal material tissue structure, namely whether the metal tissue structure is uniform or not, because fine cracks, shrinkage cavities, holes, sand holes and the like can form stress concentration points under the thermal stress state, so that the mold is cracked.

Therefore, the trade-off between the two factors determines the technical effect and the cost. Most of the existing metal mold designs pay attention to a casting blank processing mold made of expensive heat-resistant metal so as to improve the heat stress cracking resistance of the mold. In the practical application of the embodiment, it is found that the actual cause of the cracking damage of the die is mainly the reason that the metal structure of the casting blank is uneven and has fine defects, which is just the problem that the casting blank cannot overcome and is not the material composition itself.

Therefore, the main reason for causing the thermal stress cracking of the die is the structural uniformity of the die material, and the selected material has certain plasticity. Based on this knowledge, Q235, which is the most common hot-rolled ordinary low-carbon structural steel, was selected for this example.

On one hand, the common material is a formed hot-rolled thick plate, and the material is uniform after rolling, has few internal tissue defects and is low in price. On the other hand, the low carbon content of the low carbon structural steel Q235 ensures that the steel has better plasticity and is not easy to harden under the alternate cold and hot impact. Tests prove that the service life of the die made of the material can reach more than 8000 times, which is 4 times of that of a heat-resistant alloy casting blank die.

In addition, cracks generated in the heat-resistant alloy casting blank die cannot be repaired by welding, but the metal die made of the hot-rolled common low-carbon structural steel Q235 has excellent welding performance, and the service life of the die can be prolonged by more than 2000 times by repairing the damaged part by welding.

The service life of the hot-rolled common low-carbon structural steel Q235 metal mold is 5 times longer than that of the existing mold, the material price is only 40% of that of the existing heat-resistant alloy casting blank, and the use cost of the mold is greatly reduced. The cost of the metal mold is very important to the economic applicability of the whole metal mold casting technology and is also a key factor that the metal mold casting technology cannot be widely applied at present.

Therefore, the present embodiment focuses more on the influence of the uniformity of the material structure on the mold life from the material selection method.

Preferably, the inner surface of the cavity 10 of the metal mold 2 is coated with a heat insulating layer. The heat insulation layer of the embodiment has better coating strength on one hand, and is not easy to be washed away by molten iron, so that slag holes in castings are formed. On the other hand, the coating has better collapsibility, and residual coatings on the surfaces of the die and the casting after casting and forming are easy to remove. Moreover, because the addition amount of the bentonite is less than that of the traditional calcium bentonite, the air permeability of the dry coating is improved, and the defects of air holes, pits and the like on the surface of the casting are reduced.

The heat-insulating coating of the metal mold is a water-based coating which is sprayed on the surface of a metal mold cavity with certain temperature before casting each time and can form a dry breathable coating with certain thickness. In order to ensure the uniformity of the coating and the wall thickness and size precision of the pipe casting, during specific use, spraying is generally adopted before each casting, after the casting is taken out after the casting is finished, residual coating needs to be cleaned, then spraying is carried out again, and then casting is carried out.

In the research process, the heat-insulating coating of the metal mold is determined to have the following characteristics:

1) the alloy has high temperature resistance, can resist high-temperature molten iron, and can ensure the attractive appearance of a casting;

2) the heat insulation and preservation performance is provided so as to slow down the heating speed of the metal mold and the solidification speed of molten iron;

3) the air-permeable layer has good air permeability, so that an air-permeable layer is formed between the casting and the metal mold cavity to absorb gas generated in the casting solidification process;

4) the coating has certain coating strength so as to ensure that the dry coating is not washed and shed when molten iron is cast;

5) has better demolding performance and high-temperature collapsibility, and is convenient for the demolding of the casting and the cleaning of the involved coating in the cavity.

In a preferred embodiment, as shown in fig. 1, the first half-mould 21 and the second half-mould 22 are further provided with: a dowel hole 14 and a dowel pin 15 for keeping the relative positions of the two mold halves from shifting when the mold halves are closed. The positioning pin holes 14 on the first half die 21 are matched with the positioning pins 15 on the second half die 22 correspondingly in position and size. The positioning pins 15 on the first half die 21 are matched with the positioning pin holes 14 on the second half die 22 correspondingly in position and size.

For example, the metal mold 2 is provided with a positioning pin hole 14 and a positioning pin 15 for each mold half, and the position and size thereof are determined by design according to different castings. The positioning pin 15 of one half of the die is matched with the positioning hole 14 of the other half of the die correspondingly in position and size, so that the relative position is kept and the two half of the die are not shifted when the two half of the die of the metal die 2 are closed, and the external dimension of the casting is ensured to meet the design requirement.

In a preferred embodiment, the positioning core groove 13 is further provided with: and a core positioning slot 17 for positioning the core in the first mold half 21 and the second mold half 22. The sand core positioning groove 17 is matched with a positioning flange arranged on the sand core.

In this embodiment, the sand core positioning groove 17 is a concave cavity matching with the outer surface shape of the positioning flange 21 of the sand core 3, and is used for preventing the sand core 3 installed in the metal mold 2 from shifting during casting, so as to ensure the casting dimensional accuracy of the casting.

In the above embodiment, the metal mold 2 is used for casting a thin-wall gray cast iron pipe, and a vertical parting structure is adopted, that is, the parting surface 18 of the metal mold 2 is kept vertical, and when the first half mold 21 and the second half mold 22 are closed, the parting surfaces 18 are attached to each other.

For example, when the mold halves 2 are closed, the parting plane 18 completely conforms to form a cavity of the mold 2. The parting surface 18 is a plane or a curved surface formed by an outline closed line projected according to a parting direction of the casting design. Therefore, the parting surfaces 18 of the first half mold 21 and the second half mold 22 are completely jointed when the two half molds are closed, so that the molten iron does not leak during casting of the casting and the casting 4 is smoothly demoulded after being formed.

In this embodiment, as shown in fig. 2, the metal mold casting apparatus may include: the device comprises a frame 5, a fixed template 6, a movable template 7, a movable template guide shaft 8, a pneumatic mold closing device 9 and a metal mold 2. The metal mold 2 is a pair of two half molds, which are respectively and correspondingly arranged on the fixed mold plate 6 and the movable mold plate 7. The fixed template 6 is arranged on the frame 5, and the movable template guide shaft 8 is arranged between the frame 5 and the fixed template 6 and penetrates through the movable template 7. One end of the mold closing device is fixed on the frame 5, and the other end is connected to the movable mold plate 7; driven by a pneumatic die assembly device 9, the movable die plate 7 reciprocates on a movable die plate guide shaft 8 to complete die opening and closing actions.

Here, the metal mold 2 will be further described by taking an example in which a metal mold is applied to the above-described metal mold casting apparatus:

the metal mold 2 comprises a pair of two half molds, namely a first half mold 21 and a second half mold 22, and comprises a cavity 10, a sprue 11, a pouring gate 12, a positioning core groove 13, a positioning pin hole 14, a positioning pin 15, a fixed support leg 16, a sand core positioning groove 17 and a parting surface 18, wherein the metal mold 2 is fixedly arranged on a fixed mold plate 6 and a movable mold plate 7 on the metal mold casting equipment 1 respectively through the fixed support leg 16, the movable mold plate 7 enables the two half molds of the metal mold 2 to be closed together under the horizontal pushing of a pneumatic mold closing device 9, the opposite positioning pin hole 14 and the positioning pin 15 on the metal mold 2 are matched when the two half molds are closed, the opposite positions of the two half molds are fixed, and the parting surfaces 18 of the two half molds are kept in a completely-jointed state when the two half molds.

In summary, in the above embodiments, the metal mold 2 is composed of a pair of two mold halves, and is divided vertically, the gate 11 is disposed above the mold, and the runner 12 extends from the upper portion of the cavity 10 into the cavity 10. When the two halves are closed, the parting surfaces 18 are completely attached to form a cavity for molding the casting. The vertical parting and pouring system arrangement mode of the metal mold is beneficial to the rapid filling and forming of molten iron in the narrow gap between the cavity and the sand core under the action of gravity. Compared with the existing upper part rain type pouring gate, the metal mold 2 of each embodiment can shorten the casting time, avoid the phenomenon of insufficient casting caused by overlong mold filling time, and improve the yield.

In addition, the metal mold 2 of each embodiment adopts an integral structure, and the metal mold 2 adopts a positioning core slot and a sand core positioning slot dual positioning mode for positioning the metal mold core so as to ensure the positioning precision and the casting size precision.

It should be noted that, in the existing mold adopting the assembly structure, when the mold is heated at a high temperature, the mold is easily deformed, so that the position of the mold during assembly is changed, the mold closing is difficult, and the positioning accuracy of the mold during mold closing is affected. In addition, the heated state of the parts is inconsistent, the parting surface of the die can be formed to be arched and deformed, the die assembly gap is increased, molten iron leaks, and the rejection rate of castings is increased. Compared with the prior art, the metal mold 2 of the present embodiment has the advantages of no resistance to heat conduction and uniform thermal deformation by adopting an integral mold structure, and the above problems are prevented.

Metal mold casting apparatus embodiment

Referring to fig. 1, there is shown the structure of the metal mold casting apparatus of the present embodiment. The metal mold casting apparatus of the present example includes: the device comprises a frame 5, a fixed template 6, a movable template 7, a movable template guide shaft 8, a mold closing device and a metal mold 2. The metal mold 2 is a pair of two half molds, which are respectively and correspondingly arranged on the fixed mold plate 6 and the movable mold plate 7. The fixed template 6 is arranged on the frame 5, and the movable template guide shaft 8 is arranged between the frame 5 and the fixed template 6 and penetrates through the movable template 7. One end of the mold closing device is arranged on the frame 5, and the other end of the mold closing device is arranged on the movable mold plate 7. Driven by the mold closing device, the movable mold plate 7 reciprocates on the movable mold plate guide shaft 8 to complete the mold opening and closing action.

The mold clamping device described in the above embodiment may be a pneumatic mold clamping device 9, a manual or electric screw mold clamping device. The manual screw mold closing device can be used for small-batch production, and the electric screw mold closing device can be used under the condition without an air source. Here, the mold clamping device of the present embodiment may preferably employ a pneumatic mold clamping device 9.

The metal mold casting equipment designed by the embodiment adopts pneumatic drive control to supply air to the pouring pipeline in a centralized manner, only needs an air source and does not need a power supply, has the characteristics of simple structure, small occupied area of the equipment, high action speed of the equipment, high production efficiency, rapidness in loading and unloading molds and the like, and is particularly suitable for production of mechanized casting production lines. Additionally, the utility model relates to a metal mold casting equipment easy maintenance, easy and simple to handle make its fault rate greatly reduced to reduction production operation cost is low, very is convenient for constitute mechanized automatic casting production line.

Therefore, the metal mold casting equipment designed and developed in the embodiment is suitable for pneumatic operation of a mechanized casting production line, and can effectively solve the problems of complex structure, high manufacturing cost, low action speed, low production efficiency and the like of the currently used gravity casting machine.

In the above embodiment, the frame 5 includes: a horizontal steel frame 51 and a vertical reinforcing steel plate 52 for fixing the pneumatic mold clamping device 9; wherein, the horizontal steel frame 51 and the vertical reinforced steel plate 52 are welded or integrally formed. In the above embodiment, the fixed die plate 6 is vertically connected to the horizontal steel frame 51.

In a preferred embodiment, reinforcing ribs are provided between the outer sides of the vertical reinforcing steel plates 52 and the horizontal steel frame 51.

In the above embodiment, the four corners of the fixed die plate 6 and the vertical reinforcing steel plate 52, and the two opposite corners of the movable die plate 7 are respectively provided with the shaft holes for mounting the guide shafts 8 of the movable die plate. The position of the shaft hole formed in the movable template 7 and used for installing the guide shaft 8 of the movable template corresponds to the position of the shaft hole in the fixed template 6.

It should be noted that the number of the movable die plate guide shafts 8 is at least two, and the movable die plate guide shafts 8 are installed by selecting any two or more diagonally distributed shaft holes according to the requirement of convenient operation and are fastened by nuts.

In the above embodiment, one end of the guide shaft 8 of the movable platen is installed in two diagonally distributed shaft holes of the vertically reinforcing steel plate 52, and the other end is installed in a shaft hole of the fixed platen 6 corresponding to a selected shaft hole of the vertically reinforcing steel plate 52. Wherein, the movable mould plate 7 is arranged on the guide shaft 8 of the movable mould plate through a shaft hole.

In the above embodiment, the center of one side of the fixed die plate 6 is provided with an installation screw hole for fixedly connecting the pneumatic die clamping device 9. The center of one side of the movable mould plate 7 is provided with a mounting hole connected with a cylinder shaft head of the pneumatic mould closing device 9, and the mounting hole of the center of one side of the movable mould plate 7 is tightly connected with the cylinder shaft head of the pneumatic mould closing device 9 through bolts. Wherein, the fixed template 6 and the movable template 7 are respectively provided with more than two through holes for fixing the metal mold 2. In the above embodiment, the metal mold 2 has a vertically parted structure, and the gate of the metal mold 2 is disposed above the gate, and the runner thereof enters the cavity from the upper portion of the cavity.

Therefore, the metal mold casting equipment 1 has the characteristics of simple structure, high action speed, high production efficiency, quick mold loading and unloading, convenience in maintenance, simplicity and convenience in operation, low production and operation cost and the like, and only needs an air source and does not need to be electrified. Can conveniently form a mechanical automatic casting production line.

The traditional hydraulic gravity casting machine is additionally provided with a hydraulic workstation, a hydraulic pipeline, an electromagnetic control valve and a hydraulic oil cylinder, has complex structure, slow operation action, poor adaptability to high-temperature severe environment, large floor area and high manufacturing cost, and is more than 10 times of the manufacturing cost of metal casting equipment 1.

The mold casting apparatus of the above embodiment is further described below with reference to an example:

in this example, as shown in fig. 1, the metal mold casting apparatus 1 includes a frame 5, a fixed platen 6, a movable platen 7, two movable platen guide shafts 8, and a pneumatic mold clamping device 9, the fixed platen is vertically welded to the frame 5, the two movable platen guide shafts 8 are installed on the frame 5 and the fixed platen 6, and the movable platen 7 is installed on the two movable platen guide shafts 8 and connected to the pneumatic mold clamping device 9 for horizontal reciprocating motion.

The metal mold casting equipment is used for manufacturing thin-wall gray cast iron pipe fittings, and a rack 5 of the metal mold casting equipment 1 is formed by welding a horizontal steel section frame 51 and a vertical reinforcing steel plate 52 for fixing a pneumatic mold closing device 9; and shaft holes for installing the guide shafts 8 of the movable template are processed at four corners of the vertical reinforcing steel plate 52.

The fixed die plate 6 is vertically welded on a section steel frame of the frame 5, shaft holes for mounting a guide shaft 8 of the movable die plate are processed at four corners of the fixed die plate 6, a mounting screw hole for fixing a pneumatic die closing device 9 is processed at the center of one side of the fixed die plate 6, and a plurality of through holes for fixing the metal die 2 are processed on the fixed die plate 6;

one ends of the two movable template guide shafts 8 are arranged in two diagonally distributed shaft holes on the vertical reinforced steel plate 52 of the frame 5 and are fastened by nuts, and the other ends of the two movable template guide shafts are arranged in shaft holes corresponding to the selected shaft holes on the fixed template 6 and the vertical reinforced steel plate 52 and are fastened by nuts. Wherein, two movable mould plate guide shafts 8 can be installed by selecting any two shaft holes which are distributed diagonally according to the operation convenience requirement of the metal mold casting equipment 1.

Two opposite corners of the movable mould plate 7 are provided with shaft holes for installing a guide shaft 8 of the movable mould plate, the center of one side of the movable mould plate 7 is provided with an installation hole connected with a cylinder shaft head of a pneumatic mould closing device 9, and the movable mould plate 7 is provided with a plurality of through holes for fixing the metal mould 2. The shaft hole position of the movable template 7 corresponds to the shaft hole position of the fixed template 6 on which the movable template guide shaft 8 is installed, the movable template 7 is installed on the movable template guide shaft 8 through the shaft hole, a central installation hole in one side of the movable template 7 is tightly connected with a pneumatic die closing device 9 cylinder shaft head through a bolt, and the pneumatic die closing device 9 cylinder drives the movable template 7 to reciprocate on the movable template guide shaft 8 to complete the die opening and closing action.

It should be noted that, in this embodiment, the metal mold 2 is composed of a pair of two half molds, including a cavity 10, a gate 11, a runner 12, a positioning core groove 13, a positioning pin hole 14, a positioning pin 15, a fixing leg 16, a sand core positioning groove 17 and a parting surface 18, the metal mold 2 is respectively and fixedly installed on the fixed mold plate 6 and the movable mold plate 7 on the metal mold casting device 1 by the fixing leg 16, the movable mold plate 7 is pushed horizontally by the pneumatic mold closing device 9 to close the two half molds of the metal mold 2 together, the opposite positioning pin hole 14 and the positioning pin 15 on the metal mold 2 are engaged when the two half molds are closed, so that the relative positions are fixed, and the parting surfaces 18 of the two half molds are kept in a completely fitted state when the two half molds are closed.

The metal mold 2 is of a vertical parting structure, that is, the parting surface of the metal mold 2 is kept vertical. The metal mold 2 is composed of a pair of two half molds, and when the two half molds are closed, the parting surfaces are completely attached to form a cavity of the metal mold 2. Wherein, the cavity 10 is a concave cavity matched with the shape of the outer surface of the casting and is used for forming the shape of the casting during casting. Two half dies of the metal mold 2 are respectively installed and fixed on a fixed die plate 6 and a movable die plate 7 of the metal mold casting equipment 1.

In an embodiment, a sand core 3 is arranged in the metal mold 2, and a positioning core slot of the metal mold 2 is a concave cavity matched with the shape of the outer surface of a positioning core head of the sand core 3, so as to fix the relative position of the sand core 3 in the metal mold 2 and ensure that the casting 4 meets the wall thickness requirement specified by design.

Preferably, the metal mold 2 is vertically divided, a gate is arranged above the mold, and a pouring channel enters the cavity from the upper part of the cavity. The setting mode of the parting and pouring system is beneficial to the rapid filling and forming of molten iron in the narrow gap between the cavity and the sand core under the action of gravity, the pouring time is shortened, the phenomenon of insufficient casting due to overlong filling time is avoided, and the yield is improved.

The metal mold 2 is a thin-wall gray cast iron pipe metal mold, and the metal mold 2 adopts a vertical parting structure, namely, a parting surface 18 of the metal mold 2 keeps a vertical state. The metal mold 2 is composed of a pair of two half molds, and when the two half molds are closed, the parting surface 18 is completely attached to form a cavity of the metal mold 2.

Wherein, the cavity 10 is a concave cavity matched with the shape of the outer surface of the casting 4 and is used for forming the shape of the casting during casting. The pouring gate 11 is arranged above the metal mold according to the casting process requirement of the casting 4, when the two molds are closed, the upper parts of the two molds are horn-shaped cavities, the lower parts of the two molds are cylindrical cavities, the pouring gate 12 is a concave flat groove processed according to the casting process requirement size of the casting 4, the upper parts of the two molds are communicated with the cylinder of the pouring gate 11, the lower parts of the two molds are communicated with the cavity 10 of the metal mold 2, when in casting, molten iron is poured in from the pouring gate 11 and flows into and fills the gap between the cavity 10 and the sand core main body 19 of the sand mold 3 through the pouring gate 12.

In an alternative embodiment, the positioning core slot 13 is a concave cavity with a shape matching the outer surface of the positioning core head 20 of the sand core 3, so as to fix the relative position of the sand core 3 in the metal mold 2, and ensure that the casting 4 meets the wall thickness requirement specified by the design. The sand core positioning groove 17 is a concave cavity matched with the outer surface shape of the positioning flange 21 of the sand core 3, and is used for preventing the sand core 3 arranged in the metal mold 2 from shifting during casting so as to ensure the casting size precision of a casting.

In a preferred embodiment, the two halves of the metal mold 2 are each provided with a registration pin hole 14 and a registration pin 15, the location and size of which are determined by design for each casting. The positioning pin 15 of one half of the die is matched with the positioning hole 14 of the other half of the die correspondingly in position and size, so that the relative position is kept and the two half of the die are not shifted when the two half of the die of the metal die 2 are closed, and the external dimension of the casting is ensured to meet the design requirement.

In the above embodiment, the fixing legs 16 of the metal mold 2 are rectangular steel plates welded to two sides of the metal mold 2, and the two halves of the metal mold 2 are respectively fixed on the fixed mold plate 6 and the movable mold plate 7 of the metal mold casting device 1 by fastening bolts or pressing the fixing legs 16 with a pressing plate.

The parting surface 18 of the metal mold 2 is a plane or a curved surface formed by an outline closed line projected according to the parting direction designed by the casting 4, and the parting surfaces 18 of the two halves of the metal mold 20 are completely attached when the two halves of the mold are closed, so that the molten iron is prevented from leaking during casting of the casting and the casting 4 is smoothly demoulded after being formed.

In summary, the metal mold 2 is vertically divided, the gate 11 is disposed above the mold, and the runner 12 enters the cavity 10 from the upper part of the cavity 10. The setting mode of the parting and pouring system is beneficial to the rapid filling and forming of molten iron in the narrow gap between the cavity and the sand core under the action of gravity, the pouring time is shortened, the phenomenon of insufficient casting caused by overlong filling time is avoided, and the yield is improved.

Compared with the prior art, the above embodiments of the present invention have the following advantages:

the utility model discloses the metal mold casting equipment that above-mentioned each embodiment designed adopts pneumatic drive control, to pouring pipeline central gas feed, only needs the air supply and need not the power, has characteristics such as simple structure, equipment area are little, equipment action speed is fast, production efficiency is high, loading and unloading mould is swift, especially is suitable for mechanized casting production line production very much. Additionally, the utility model relates to a metal mold casting equipment easy maintenance, easy and simple to handle make its fault rate greatly reduced to reduction production operation cost is low, very is convenient for constitute mechanized automatic casting production line.

Therefore, the utility model relates to a pneumatic metal mold casting equipment who is applicable to mechanized casting production line of development can effectively solve present used gravity type casting machine structure complicacy, and the cost is expensive, and action speed is slow, and production efficiency low grade is not enough the scheduling problem.

The utility model discloses the technical problem who solves improves product quality to reduction in production cost, realizes convenient high-efficient mechanized production, alleviates traditional casting process and has interrelated's combined effect to high salary molding skilled worker's dependence etc.. The utility model discloses the implementation of achievement is that metal mold casting technology has stepped forward a big step to economic nature and practicality, and its product comprehensive cost is not only far below traditional mechanized casting mode, is less than low cost's hand casting mode moreover. The product quality also reaches the semi-precision casting grade level which cannot be achieved by the two production modes. Through the technical scheme of the utility model the thin wall grey cast iron pipe fitting metal mold casting production line that establishes makes it to become at present the best quality in internal, and the cost is lowest, and production efficiency is the highest and the biggest cast iron drain pipe fitting production base of scale.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A metal mold is arranged on a metal mold casting device and is characterized by comprising a first half mold (21) and a second half mold (22) which are processed by low-carbon structural steel with uniform metal structure; the first half mould (21) and the second half mould (22) are correspondingly provided with: the casting mold comprises a cavity (10) for forming the appearance of a casting during casting, a pouring gate (11), a pouring gate (12), a fixed support leg (16) and a parting surface (18);

wherein the cavity (10) is a concave cavity matched with the shape of the outer surface of the casting and accommodates a sand core (3) for limiting the shape and the wall thickness of the inner surface of the casting; a positioning part for positioning the relative position between the sand core (3) and the cavity (10) is arranged above the cavity (10);

the pouring gates (11) are respectively and correspondingly arranged above the first half mould (21) and the second half mould (22), and the pouring gate (12) is communicated with the pouring gates (11) and extends into the cavity (10) from the upper part of the cavity (10);

the first half mould (21) and the second half mould (22) are respectively and fixedly connected to the metal mold casting equipment through respective fixing legs (16);

the parting surfaces (18) are kept in a vertical state, and when the first half mould (21) and the second half mould (22) are closed, the parting surfaces (18) are mutually attached.

2. The metal mold as recited in claim 1, wherein the low carbon structural steel is Q235 hot rolled ordinary low carbon structural steel having a carbon content in the range of 0.12% to 0.22%.

3. Metal mould according to claim 2, characterised in that the inner surface of the mould cavity (10) is coated with a thermally insulating layer.

4. The metal-type die of claim 3,

the positioning part comprises a positioning core groove (13) and a sand core positioning groove (17), and the positioning core groove (13) is used for positioning a core head of the sand core (3) and the cavity (10); the sand core positioning groove (17) is used for positioning the relative position between the main body of the sand core (3) and the cavity (10);

and a positioning flange is arranged on the sand core (3), and the shape of the positioning flange is matched with the shape of the inner wall of the sand core positioning groove (17).

5. The metal type mold according to any one of claims 1 to 4,

the first half-mould (21) and the second half-mould (22) are further provided with: a positioning pin hole (14) and a positioning pin (15) which are used for keeping the relative positions of the two half moulds from shifting when the two half moulds are closed;

the positioning pin holes (14) on the first half die (21) are correspondingly matched with the positioning pins (15) on the second half die (22) in position and size;

the positioning pins (15) on the first half die (21) are correspondingly matched with the positioning pin holes (14) on the second half die (22) in position and size.

6. The metal-type die of claim 5,

when the first half mould (21) and the second half mould (22) are closed, the sprue (11) is in a cavity with a horn-shaped upper part and a cylindrical lower part; and/or the presence of a gas in the gas,

the upper part of the pouring gate (12) is communicated with the cylinder of the pouring gate (11), and the lower part of the pouring gate is communicated with the cavity (10); wherein the pouring channel (12) is a concave flat groove processed according to the size required by the casting process of the casting.

7. A metal mold casting apparatus, comprising: a frame (5), a stationary platen (6), a movable platen (7), a movable platen guide shaft (8), a mold clamping device, and a metal mold (2) according to any one of claims 1 to 6; wherein,

the first half mould (21) and the second half mould (22) are respectively and correspondingly arranged on the fixed mould plate (6) and the movable mould plate (7);

the fixed template (6) is arranged on the rack (5), and the movable template guide shaft (8) is arranged between the rack (5) and the fixed template (6) and penetrates through the movable template (7);

one end of the mold closing device is arranged on the rack (5), and the other end of the mold closing device is arranged on the movable mold plate (7); and under the drive of the mold closing device, the movable mold plate (7) reciprocates on the movable mold plate guide shaft (8) to complete the mold opening and closing action.

8. The metal mold casting apparatus according to claim 7, wherein the mold clamping device is a pneumatic mold clamping device (9), a manual or electric screw mold clamping device.

9. The metal mold casting apparatus of claim 8,

the frame (5) comprises: the pneumatic mould clamping device comprises a horizontal steel section frame (51) and a vertical reinforcing steel plate (52) for fixing the pneumatic mould clamping device (9); wherein the horizontal steel section frame (51) and the vertical reinforcing steel plate (52) are welded or integrally formed; and/or the presence of a gas in the gas,

the movable template guide shafts (8) are at least more than two, and the movable template guide shafts (8) are installed in shaft holes which are distributed in the opposite angles according to the requirement of convenience in operation and are fastened through nuts.

10. The metal mold casting apparatus of claim 9,

the fixed template (6) is vertically connected to the horizontal steel section frame (51); and/or the presence of a gas in the gas,

more than two through holes for fixing the metal mold (2) are respectively arranged on the fixed mold plate (6) and the movable mold plate (7).