CN217452020U - Casting system in injection molding machine mode locking hydraulic system - Google Patents

Abstract

A casting system in a mold locking hydraulic system of an injection molding machine comprises a casting structure and a casting cavity, wherein the casting structure is communicated with the casting cavity, the casting cavity comprises a hydraulic cavity and a flange part positioned at the opening position of the hydraulic cavity, the bottom of the hydraulic cavity faces downwards, and the flange part faces upwards; a sand core formed by a sand framework steel pipe and a sand layer coated outside the sand framework steel pipe is arranged in the hydraulic cavity; the casting structure includes sprue, cross gate and ingate, and sprue and flange portion homonymy set up, and sprue and cross gate communicate each other, and the ingate is located below, one end and the cross gate intercommunication of cross gate, and the other end communicates with the bottom in hydraulic pressure chamber. The hydraulic pressure chamber bottom of the foundry goods die cavity of this application is down, the flange position is up, and structural fastening, intensity are high, and the foundry goods hydraulic pressure chamber need not solid psammitolite takes shape, removes the special chill at flange position simultaneously, and the foundry goods tissue that obtains is compact to can satisfy the operation requirement under the high pressure condition, the non-seepage liquid.

Description

Casting system in injection molding machine mode locking hydraulic system

Technical Field

The application relates to the technical field of injection molding machine mode locking hydraulic system casting, in particular to a casting system in an injection molding machine mode locking hydraulic system.

Background

The mold locking hydraulic system of the injection molding machine has a complex structure, the requirements on the use conditions of the required hydraulic castings are high, such as high mechanical performance, the defects of cracks, cold shut, shrinkage cavities, looseness, slag inclusion and the like are not allowed, and the castings cannot leak oil and oil, so that the requirements on the casting process of the hydraulic castings are also high.

Fig. 1-3 show a hydraulic casting of a mold locking hydraulic system of an injection molding machine, the specific structure of the casting comprises a hydraulic casting body a, a casting hydraulic cavity b with high hydraulic pressure and piston rod stroke arranged in the middle of the hydraulic casting body a, and a flange c connected with the hydraulic cavity b; the casting hydraulic cavity of the casting is usually formed through a sand core, the traditional sand core is directly formed by chromite sand through a bonding agent, the structure has the problems of insufficient sand mold strength and uneven cooling in the pouring process, and the phenomena of sand falling of surface tissues and the like can occur in the molten iron pouring process, so that the structure of the casting hydraulic cavity is influenced to be not compact enough or casting defects of air holes, slag inclusion and the like are caused, and the problems of processing roughness not reaching Ra0.8 mu m, liquid leakage and liquid seepage are caused; the flange part is provided with a special chiller, as shown in figure 3, the purpose is to accelerate chilling at a hot spot and eliminate the defect of shrinkage cavity and shrinkage porosity at the joint of the flange and a casting hydraulic cavity, however, in actual production, because the control of the chiller clearance is not good, once the chiller clearance is too large, the leakage and seepage phenomena occur at the part easily; in addition, the appearance of the casting is directly influenced by the use of the special chilling block, so that the appearance of the casting is uneven, and the polishing workload is increased; and the chill needs to carry out treatments such as shot blasting, baking and the like before use, the management and control difficulty is higher, and if the management and control are not good, casting defects such as air holes or slag holes can be generated on the surface of the casting, so that the internal quality of the casting is directly influenced.

In addition, the hydraulic casting is made of nodular cast iron QT450-10, the size of the outline hub is phi 990mm multiplied by 625mm, the weight is 1.3 tons, the thickness of the thickest part is 135mm, and the processing roughness of the radial surface of the hydraulic casting oil pressure cavity is Ra0.8 mu m, so the hydraulic casting has extremely high requirement on the casting performance of the casting, and simultaneously the hydraulic requirement of 20Mpa is also met, the casting does not have the phenomena of liquid leakage and liquid seepage, most injection molding machine manufacturers mainly use forged steel parts at present, and the conventional casting method has great difficulty; for example, the wall thickness of the casting hydraulic cavity part of the casting is thicker (the maximum thickness can reach 135mm), so that the hot spots are distributed at the combined thick wall part of the casting hydraulic cavity and the flange part, the traditional casting method of the casting is a production process that the casting hydraulic cavity faces upwards and the flange part faces downwards, cold iron is added at the hot spots to enable molten iron in the cavity to be cooled relatively uniformly, and sometimes, a large riser or a heating riser mode is adopted in a combined mode, so that the defects of loosening and shrinkage cavities and the like at the hot spots are reduced. Although the hydraulic casting can be produced to a certain extent through the efforts, the yield of the completely qualified hydraulic casting is low, even the qualified product needs to be subjected to large riser head or heating riser head cutting or large amount of special forming chilling blocks, the chilling block control difficulty is high, the polishing workload is large, and the production cost is high. On the other hand, the production process that the bottom of the hydraulic cavity of the casting faces upwards (the flange part faces downwards) has the biggest problems that the appearance quality of the reverse side of the bottom of the hydraulic cavity of the casting is poor, all molten iron with the worst quality is accumulated on the surface, the casting quality of the casting is influenced to a great extent, and oil leakage of products are easy to occur.

The casting system is provided with a downward casting hydraulic cavity and an upward flange, and can reduce casting defects of the hydraulic casting.

SUMMERY OF THE UTILITY MODEL

This application is not enough to prior art's the aforesaid, provides a hydraulic pressure chamber bottom of foundry goods die cavity down, the flange position up, and the structure fastening, intensity are high, and the foundry goods hydraulic pressure chamber need not solid psammitolite take shape, removes the special chill at flange position simultaneously, and the foundry goods tissue of obtaining is fine and close to can satisfy the foundry goods casting system among the injection molding machine mode locking hydraulic system of high pressure condition operation requirement.

In order to achieve the above object, the utility model provides a following technical scheme: a casting system in a mold locking hydraulic system of an injection molding machine comprises a casting structure and a casting cavity, wherein the casting structure is communicated with the casting cavity, the casting cavity comprises a hydraulic cavity and a flange part positioned at the opening position of the hydraulic cavity, the bottom of the hydraulic cavity is downward, and the flange part is upward; a sand core formed by a sand framework steel pipe and a sand layer coated outside the sand framework steel pipe is arranged in the hydraulic cavity; the casting structure comprises a sprue, a cross gate and an inner gate, wherein the sprue and the flange portion are arranged on the same side, the sprue is communicated with the cross gate, the inner gate is located below the cross gate, one end of the inner gate is communicated with the cross gate, and the other end of the inner gate is communicated with the bottom of the hydraulic cavity.

By adopting the structure, the casting system provided by the application has the advantages that the bottom of the hydraulic cavity faces downwards (the opening of the hydraulic cavity faces upwards), and the flange part faces upwards, so that molten iron spreads from bottom to top in the casting process, and the casting defects on the surface of the bottom plate of the hydraulic cavity can be effectively reduced; in addition, the sand core is replaced by the sand core structure with the steel pipe arranged inside and the molding sand coated on the outer surface, the sand core structure formed by all traditional molding sand is replaced, the molding sand framework steel pipe can serve as a molding sand framework for supporting, reinforcing and enhancing functions, so that the strength of the molding sand and the using amount of the molding sand can be effectively guaranteed, and in the process of pouring molten iron to fill the cavity, sand falling, slag inclusion and air holes cannot be caused, so that the compactness of the whole hydraulic cavity structure is guaranteed, and the liquid seepage phenomenon cannot occur when the casting is used under the hydraulic pressure of 20 Mpa; in addition, the casting structure of this application, with the orientation phase-match of putting of foundry goods die cavity for the molten iron stretches from the bottom to the orientation on upper portion and fills up whole die cavity, and the position of arranging and getting into the die cavity of whole casting structure all has specific setting, and ingate and foundry goods hydraulic pressure chamber bottom intercommunication because the wall thickness of the foundry goods of here is thick, directly gets into the molten iron from here and can effectively realize that the molten iron steadily gets into the foundry goods die cavity, thereby has effectively avoided circle gas, the appearance of pressing from both sides the sediment defect.

Furthermore, the cross runners comprise a first cross runner and a second cross runner, the sprue is vertically connected with the first cross runner, the ingate is vertically connected with the second cross runner, and the height of the first cross runner is lower than that of the second cross runner; by adopting the structure, the molten iron can enter the first cross gate from the sprue, a buffering effect is realized on the flow rate of the molten iron, and then the molten iron enters the second cross gate to be more gentle, so that the impact force of the molten iron on the casting cavity is reduced, and the casting quality of the casting is ensured.

Furthermore, a transition runner is also arranged between the first cross runner and the second cross runner, the transition runner comprises a first transition runner and a second transition runner, the first transition runner is communicated with the first cross runner, the bottoms of the first transition runner and the second cross runner are equal in height, and the second transition runner is positioned right above the first transition runner, is communicated with the second cross runner, and the bottoms of the second transition runner and the second cross runner are equal in height; by adopting the structure, the transition pouring channel is favorable for the molten iron to stably enter the cavity, the molten slag floats upwards in the second transition pouring channel, the defects of air enclosing and slag clamping can be further prevented, and the quality of the molten iron is ensured.

Furthermore, a filtering flat plate brick (a flat plate filter) is arranged between the first transition pouring channel and the second transition pouring channel; the filter plate brick is a straight-hole ceramic refractory plate (manufacturer: Chang Li pond refractory material company), and the arrangement of the structure is favorable for purifying molten iron and reducing slag from entering a casting cavity.

Furthermore, the height of the second transition pouring channel is 20-30 mm higher than that of the second cross pouring channel, the structure is favorable for enabling molten iron to stably enter the cavity, and is also favorable for enabling molten slag to float upwards in the second transition pouring channel (higher than the position of the second cross pouring channel, so that the molten slag is effectively prevented from entering the cavity), the defects of air entrapment and slag inclusion can be further prevented, and the quality of molten iron is ensured.

Furthermore, an auxiliary ingate is also arranged on the second horizontal pouring channel, the auxiliary ingate transversely extends out of the second horizontal pouring channel, the height of the auxiliary ingate is smaller than that of the second horizontal pouring channel, and the ingate is vertically arranged on the auxiliary ingate; by adopting the structure, the flow speed of molten iron entering the cavity can be further slowed down, so that a casting with better casting quality is obtained.

Furthermore, two ingates are arranged and are arranged in parallel, and the ingates are communicated with a platform on the reverse side of the bottom of the hydraulic cavity; because the wall thickness of the casting is thick, the molten iron directly enters the molten iron from the position, so that the molten iron can effectively and stably enter the casting cavity, and the defects of air entrapment and slag inclusion are effectively avoided; and two ingates can ensure that molten iron can enter the die cavity in sufficient quantity, so that the die cavity is full.

Furthermore, the total cross-sectional area ratio (the cross-sectional area ratio of each component) of each main unit of the casting system is Sigma A _{Straight bar} ∶ΣA _{Transverse 1} ∶ΣA _{No. 2 horizontal} ∶ΣA _{1# inner} ∶ΣA _{Inner part} 1.01-1.1: 1.3-1.5: 1, and only the minimum cut-off area Sigma A needs to be calculated by adopting the scheme _{Inner part} Determining the sectional areas of the other components; the straight gate in the proportional equation is a sprue, the 1# horizontal gate is a first horizontal gate, the 2# horizontal gate is a second horizontal gate, the 1# internal gate is an auxiliary internal gate, and the internal gate is an internal gate.

Furthermore, a plurality of risers are arranged on the upper end surface of the hydraulic cavity; by adopting the scheme, the iron liquid is supplied when the casting is formed, and the effects of preventing shrinkage cavity, shrinkage porosity, exhausting and collecting slag are achieved.

Furthermore, the molding sand layer comprises a first molding sand layer and a second molding sand layer, the first molding sand layer is positioned at the bottom of the hydraulic cavity, and the second molding sand layer is positioned between the side wall of the hydraulic cavity and the molding sand framework steel pipe; adopt above-mentioned structure, through the setting on two kinds of different molding sand layers, realize the setting to the molding sand at the different positions of foundry goods, one can see the preparation degree of difficulty that reduces the molding sand layer, and two can also prevent that the sand mould intensity that whole molding sand layer manufacture process appears easily is not enough, the uneven problem of cooling and the surperficial tissue that molten iron pouring process that leads to probably appears from falling phenomenons such as sand.

Furthermore, the thickness of the sand layer of the first sand layer is controlled to be 5-10 mm on a fillet line at the bottom of the hydraulic cavity; the thickness of the sand layer of the second type sand layer is controlled to be 15-25 mm; the structure can ensure that the molding sand cannot be washed away in the casting process, and can also ensure the casting quality of the casting.

Furthermore, the sand skeleton steel pipe is of a double-layer structure, a hollow interlayer is arranged in the middle of the double-layer structure, the hollow interlayer is provided with an air inlet and an air outlet, and the flowing air enters from the air inlet and flows out from the air outlet; by adopting the structure, the steel pipe not only realizes the supporting and reinforcing effects on the molding sand, but also can realize air flow through the interlayer, and realize effective cooling on the casting liquid of the casting.

Furthermore, the upper part of the hydraulic cavity is covered with a cope flask, and the sand framework steel pipe penetrates through the cope flask and extends into the hydraulic cavity; the upper end surfaces of the sand framework steel pipes protrude out of the upper end surface of the cope box; by adopting the structure, the positions of the sand framework steel pipes can be effectively fixed, the accuracy of the casting size of a casting is ensured, and meanwhile, flowing air can be introduced through the sand framework steel pipes to cool the cavity without influencing the structure in the cavity; make things convenient for the installation of molding sand skeleton steel pipe and the effective fixed of position to also make things convenient for letting in of the inside air of molding sand skeleton steel pipe.

Furthermore, the height of the sand layer of the cope box is 60 mm-100 mm, and the molding sand layer is a molding sand layer consisting of casting sand (molding sand) and a molding sand binder; by adopting the structure, the sand layer height of the sand box is set to realize that the sand is surrounded outside the steel pipe to protect the steel pipe and prevent the high-temperature molten iron from influencing the steel pipe; the riser or the gas outlet structure can be arranged in the sand layer, so that molten iron which is discharged or overflows from the riser during molten iron pouring is prevented from entering the steel pipe; the application of the materials such as the molding sand and the molding sand binder can be materials commonly used for preparing the sand core or the casting sand box in the industry, namely, the materials are composed of casting sand (molding sand), the molding sand binder and the like, the traditional condition of completely using chromite sand is abandoned by the manufacturing method of the sand mold, the iron liquid cooling speed is moderate, the molding sand gas evolution is less, the casting is ensured not to permeate liquid, the use amount of the chromite sand is reduced, and the production cost is reduced.

Drawings

FIG. 1 is a schematic structural view of a casting of the present application.

FIG. 2 is a schematic structural view of a cross-sectional view of a casting of the present application.

FIG. 3 is a schematic structural view of a casting of the present application having a chill.

FIG. 4 is a schematic structural view (casting orientation) of the casting system of the present application.

FIG. 5 is a schematic view of the structure visible from the bottom of the casting gating system of the present application.

FIG. 6 is a schematic view of the construction of a hydraulic chamber of the casting molding system of the present application.

FIG. 7 is a schematic view of the cast structure of the present application in the cast orientation.

FIG. 8 is a schematic view of an angle of the cast structure of the present application.

FIG. 9 is a schematic view of another angle of the cast structure of the present application.

Fig. 10 is a schematic view of the structure of the sand core of the present application.

FIG. 11 is a schematic structural diagram of mold clamping after matching of a sand core and a casting cavity.

FIG. 12 is a schematic view showing the structure of a steel pipe with a sand skeleton according to the present invention.

As shown in the attached drawings: a. the casting structure comprises a hydraulic casting body, a casting hydraulic cavity, a flange, a chill, a casting structure, a casting cavity, a f1. hydraulic cavity, a f2. flange part, a f3. platform, a sand skeleton steel pipe 1, a sand layer 2, a first sand layer 21, a second sand layer 22, a sprue 3, a runner 4, a runner 41, a first runner 42, a second runner, an ingate 5, a transition runner 6, a transition runner 61, a first transition runner 62, a second transition runner 7, a filter flat brick 8, an auxiliary ingate 8, a riser 9, an upper sand box 10 and a lower sand box 11.

Detailed Description

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

the casting cavity of the present application has the same dimensional shape as the casting, and therefore, the part name of each position of the casting can be understood to be consistent with the part name of each corresponding position of the casting cavity.

Further, it is to be noted that: when an element is referred to as being "secured to" (and other means included similarly to "being secured to") another element, it can be directly on the other element or intervening elements may also be present, secured by the intervening elements. When an element is referred to as being "connected" (and its equivalents are included as "connected") to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed on" (and other manners of "disposed on" that are similarly intended) another element, it can be directly on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 4-6 and 10-11, the casting system in the mold-locking hydraulic system of the injection molding machine of the present application comprises a casting structure e and a casting cavity f, wherein the casting structure e is communicated with the casting cavity f, the casting cavity f comprises a hydraulic cavity f1 and a flange part f2 located at an opening position of the hydraulic cavity f1, and during casting, the bottom of the hydraulic cavity f1 faces downward, and the flange part f2 faces upward; a sand core formed by a sand framework steel pipe 1 and a sand layer 2 coated outside the sand framework steel pipe is arranged in the hydraulic cavity f 1; the casting structure e comprises a sprue 3, a runner 4 and an ingate 5, wherein the sprue 3 and the flange part f2 are arranged on the same side, the sprue 3 is communicated with the runner 4, the ingate 5 is positioned below the runner 4, one end of the ingate is communicated with the runner 4, and the other end of the ingate is communicated with the bottom of the hydraulic cavity f1.

By adopting the structure, the casting system is characterized in that the bottom of the hydraulic cavity is downward, and the flange part is upward, so that molten iron spreads from bottom to top in the casting process, and the casting defects on the surface of the bottom plate of the hydraulic cavity can be effectively reduced; in addition, the sand core is replaced by the sand core structure with the steel pipe arranged inside and the molding sand coated on the outer surface, the sand core structure formed by all traditional molding sand is replaced, the molding sand framework steel pipe can serve as a molding sand framework for supporting, reinforcing and enhancing functions, so that the strength of the molding sand and the using amount of the molding sand can be effectively guaranteed, and in the process of pouring molten iron to fill the cavity, sand falling, slag inclusion and air holes cannot be caused, so that the compactness of the whole hydraulic cavity structure is guaranteed, and the liquid seepage phenomenon cannot occur when the casting is used under the hydraulic pressure of 20 Mpa; in addition, the casting structure of this application, with the orientation phase-match of putting of foundry goods die cavity for the molten iron stretches from the bottom to the orientation on upper portion and fills up whole die cavity, and the position of arranging and getting into the die cavity of whole casting structure all has specific setting, and ingate and foundry goods hydraulic pressure chamber bottom intercommunication because the wall thickness of the foundry goods of here is thick, directly gets into the molten iron from here and can effectively realize that the molten iron steadily gets into the foundry goods die cavity, thereby has effectively avoided circle gas, the appearance of pressing from both sides the sediment defect.

As shown in fig. 4-9, the runners 4 according to the present application include a first runner 41 and a second runner 42, the sprue 3 is vertically connected to the first runner 41, the ingate 5 is vertically connected to the second runner 42, and the height of the first runner 41 is lower than that of the second runner 42; by adopting the structure, the molten iron can enter the first cross gate from the sprue, the buffering effect on the flow speed of the molten iron is realized, then the molten iron enters the second cross gate to be more gentle, the impact force of the molten iron on the casting cavity is reduced, and the casting quality of the casting is ensured.

As shown in fig. 4-9, a transition runner 6 is further disposed between the first runner 41 and the second runner 42, the transition runner 6 includes a first transition runner 61 and a second transition runner 62, the first transition runner 61 is communicated with the first runner 41 and has the same height at the bottom thereof, and the second transition runner 62 is located right above the first transition runner 61 and is communicated with the second runner 42 and has the same height at the bottom thereof; by adopting the structure, the transition pouring channel is favorable for the molten iron to stably enter the cavity, the molten slag floats upwards in the second transition pouring channel, the defects of air enclosing and slag clamping can be further prevented, and the quality of the molten iron is ensured.

As shown in fig. 4-9, a filtering flat plate brick 7 (flat plate filter) is disposed between the first transition gate 61 and the second transition gate 62 as described herein; the filter plate brick is a straight-hole ceramic refractory plate (manufacturer: Chang Li pond refractory material company), and the arrangement of the structure is favorable for purifying molten iron and reducing slag from entering a casting cavity.

As an example, as shown in fig. 7-9, the height of the second transition runner 62 is 20mm to 30mm higher than the second runner 42 (that is, the height of the top of the inner cavity of the second transition runner is higher than the height of the top of the inner cavity of the second runner, and the heights of the inner cavities at the bottoms of the second runner and the second runner may be the same), which is beneficial for molten iron to enter the cavity smoothly, and is also beneficial for slag to float upwards in the second transition runner (the molten slag is trapped at a position higher than the second runner, thereby effectively preventing the molten slag from entering the cavity), and can further prevent the occurrence of air trapping and slag inclusion defects, and ensure the quality of molten iron.

As shown in fig. 6 and 8, the second cross runner 42 is further provided with an auxiliary ingate 8, the auxiliary ingate 8 extends out of the second cross runner 42 in the transverse direction, the height of the auxiliary ingate 8 is less than the height of the second cross runner 42 (i.e. the bottom of the auxiliary ingate slightly protrudes out of the bottom of the second cross runner, and the upper part of the auxiliary ingate 8 is lower than the second cross runner), and the ingate 5 is vertically arranged on the auxiliary ingate (the two are vertically connected); by adopting the structure, the flow speed of molten iron entering the cavity can be further slowed down, so that a casting with better casting quality is obtained.

As shown in fig. 4-9, two ingates 5 are provided, and the two ingates 5 are arranged in parallel with each other (the two ingates are parallel in the vertical direction, and the part which is transversely connected with the casting cavity is flared), and the ingates 5 are communicated with a platform f3 on the reverse side of the bottom of a hydraulic cavity f1 (specifically, as shown in fig. 5, the platform is located at the center of the bottom plate of the hydraulic cavity and is a step surface slightly protruding from the bottom); because the wall thickness of the casting is thick, the molten iron directly enters the molten iron from the position, so that the molten iron can effectively and stably enter the casting cavity, and the defects of air entrapment and slag inclusion are effectively avoided; and two ingates can ensure that molten iron can enter the die cavity in sufficient quantity, so that the die cavity is full.

By way of example, the casting system described herein has a total cross-sectional area ratio of the major units (component cross-sectional area ratio) of Σ a _{Straight bar} ∶ΣA _{Transverse 1} ∶ΣA _{No. 2 horizontal} ∶ΣA _{1# inner} ∶ΣA _{Inner part} 1.01-1.1: 1.3-1.5: 1, and only the minimum cut-off area Sigma A needs to be calculated by adopting the scheme _{Inner part} Determining the sectional areas of the other components; the straight gate in the proportional formula is a straight gate, the No. 1 cross is a first cross gate, the No. 2 cross is a second cross gate, the No. 1 inner gate is an auxiliary inner gate, and the inner gate is an inner gate; wherein the first and second runners have component cross-sectional areas that are equal.

As shown in fig. 4 to 6, the hydraulic chamber f1 of the present application has a plurality of risers 9 (five in the illustrated example, uniformly distributed circumferentially on the upper end surface of the hydraulic chamber); by adopting the scheme, the iron liquid is supplied when the casting is formed, and the effects of preventing shrinkage cavity, shrinkage porosity, exhausting and slag collection are achieved.

As shown in fig. 10 to 11, the sand layer 2 of the present application includes a first sand layer 21 and a second sand layer 22, the first sand layer 21 is located at the bottom of the hydraulic chamber f1, and the second sand layer 22 is located between the side wall of the hydraulic chamber f1 and the sand skeleton steel pipe 1; the casting cavity is formed between the upper sand box 10 and the lower sand box 11, and the size of the casting cavity is consistent with that of a casting; adopt above-mentioned structure, through the setting on two kinds of different molding sand layers, realize the setting to the molding sand at the different positions of foundry goods, one can see the preparation degree of difficulty that reduces the molding sand layer, and two can also prevent that the sand mould intensity that whole molding sand layer manufacture process appears easily is not enough, the uneven problem of cooling and the surperficial tissue that molten iron pouring process that leads to probably appears from falling phenomenons such as sand.

By way of example, the sand layer thickness of the first sand layer 21 is controlled to be 5-10 mm (axial thickness) on a fillet line at the bottom of the hydraulic cavity f1 (a fillet structure is arranged at the bottom of the hydraulic cavity of the casting cavity); the thickness of the sand layer of the second type sand layer 22 is controlled to be 15 mm-25 mm (radial thickness); the structure can ensure that the molding sand cannot be washed out in the casting process, and can also ensure the casting quality of the casting at the position.

As shown in fig. 10 to 12, the sand skeleton steel pipe 1 of the present application has a double-layer structure (hollow sandwich structure), a hollow sandwich is provided in the middle of the double-layer structure, the hollow sandwich has an air inlet and an air outlet, and the flowing air enters from the air inlet and flows out from the air outlet; by adopting the structure, the steel pipe not only realizes the supporting and reinforcing effects on the molding sand, but also can realize the air flow through the interlayer, and realize effective cooling on the casting liquid of the casting.

As shown in fig. 10 to 11, the upper part of the hydraulic chamber f1 of the present application is covered with a cope flask 10 (risers are also embedded in the cope flask), and the sand skeleton steel tubes 1 pass through the cope flask 10 and extend into the hydraulic chamber f 1; the upper end surface of the sand framework steel pipe 1 protrudes out of the upper end surface of the cope flask 10; by adopting the structure, the positions of the sand framework steel pipes can be effectively fixed, the accuracy of the casting size of a casting is ensured, and meanwhile, flowing air can be introduced through the sand framework steel pipes to cool the cavity without influencing the structure in the cavity; make things convenient for the installation of molding sand skeleton steel pipe and the effective fixed of position to also make things convenient for letting in of the inside air of molding sand skeleton steel pipe.

As an example, the sand layer height of the cope flask 10 described in the present application is 60mm to 100mm (axial height), and sand is surrounded on the outside of the steel pipe to protect the steel pipe; the molding sand layer 2 is a molding sand layer consisting of casting sand (molding sand) and a molding sand binder; by adopting the structure, the sand layer height of the sand box is set to realize that the sand is surrounded outside the steel pipe to protect the steel pipe and prevent the high-temperature molten iron from influencing the steel pipe; the riser or the gas outlet structure can be arranged in the sand layer, so that molten iron which is discharged or overflows from the riser during molten iron pouring is prevented from entering the steel pipe; the application of the materials such as the molding sand and the molding sand binder can be materials commonly used for preparing sand cores or casting sand boxes in the industry, namely, the materials are composed of casting sand (molding sand), the molding sand binder and the like, the traditional chromite sand is abandoned by the manufacturing method of the molding sand, the molten iron cooling speed is moderate, the gas evolution quantity of the molding sand is low, the casting is ensured not to permeate liquid, the using amount of the chromite sand is reduced, and the production cost is reduced.

The sand core structure of the present application is a sand core structure comprising an inner support formed by a hollow steel pipe having a sandwich layer and a sand layer formed by core sand coated on the outer surface of the steel pipe, for convenience of describing the structure herein, a casting structure and a riser structure are not shown in fig. 10 to 11, and only the upper and lower sand boxes and a casting cavity formed by the casting structure and the drawings of the sand core structure having the inner support of the steel pipe of the present application are taken as illustrations; the size structure of the casting cavity and the size structure of the hydraulic casting are completely matched, and parts indicated by the two parts can be understood to be consistent; the feeder is located at the inner ring position of the upper end face of a casting cavity, 5 feeders (the upper portion is cylindrical, and the lower portion is a cone gradually closing up) can be arranged as an example, the feeder is circumferentially and uniformly distributed, so that the thickness of the feeder is relatively thick, and sufficient feeding can be realized by the feeder.

By way of example, the sprue described herein is a cylindrical sprue, the sprue cross-sectional area of the present application is trapezoidal (small top and large bottom), and the ingate of the present application is cylindrical.

The sand core specific manufacturing method comprises the following steps: step 1, as shown in figure 10, a first molding sand layer is placed in a hydraulic cavity (a cavity structure of a casting is formed by taking a mold as a support, and the mold is removed after the manufacturing is finished, so that a casting cavity is formed at the position, and the casting molding of subsequent molten iron is facilitated), wherein the thickness of the first molding sand layer is controlled to be 5-10 mm on a fillet line at the bottom of the hydraulic cavity of the cavity; step 2, placing a steel pipe in the hydraulic cavity as shown in the attached figure 10-11, and controlling the thickness of a sand layer between the side surface of the steel pipe and the inner wall of the hydraulic cavity of the same cavity to be 15-25 mm, wherein the thickness is uniform and consistent to be a second type sand layer; and 3, continuously knocking the steel pipe, sinking the steel pipe to a first molding sand layer, putting sand (sand on a second molding sand layer) while knocking the steel pipe, and filling the space between the steel pipe and the wall of the hydraulic cavity with molding sand and compacting the molding sand.

Claims (10)

1. The utility model provides a foundry goods casting system among injection molding machine mode locking hydraulic system which characterized in that: the casting structure is communicated with the casting cavity, the casting cavity comprises a hydraulic cavity and a flange part positioned at the opening position of the hydraulic cavity, the bottom of the hydraulic cavity is downward, and the flange part is upward; a sand core formed by a sand framework steel pipe and a sand layer coated outside the sand framework steel pipe is arranged in the hydraulic cavity; the casting structure comprises a sprue, a cross gate and an inner gate, wherein the sprue and the flange portion are arranged on the same side, the sprue is communicated with the cross gate, the inner gate is located below the cross gate, one end of the inner gate is communicated with the cross gate, and the other end of the inner gate is communicated with the bottom of the hydraulic cavity.

2. The casting system in the injection molding machine mold locking hydraulic system according to claim 1, wherein: the transverse pouring channels comprise a first transverse pouring channel and a second transverse pouring channel, the sprue is vertically connected with the first transverse pouring channel, the ingate is vertically connected with the second transverse pouring channel, and the height of the first transverse pouring channel is lower than that of the second transverse pouring channel.

3. The casting system in the injection molding machine mold locking hydraulic system according to claim 2, wherein: and a transition pouring channel is also arranged between the first transverse pouring channel and the second transverse pouring channel and comprises a first transition pouring channel and a second transition pouring channel, the first transition pouring channel is communicated with the first transverse pouring channel, the bottoms of the first transition pouring channel and the second transverse pouring channel are equal in height, and the second transition pouring channel is positioned right above the first transition pouring channel, is communicated with the second transverse pouring channel and is equal in height.

4. The casting system in the injection molding machine mold locking hydraulic system according to claim 3, wherein: a filtering flat brick is arranged between the first transition pouring channel and the second transition pouring channel; the height of the second transition pouring channel is 20 mm-30 mm higher than that of the second cross pouring channel.

5. The casting system in the injection molding machine mold locking hydraulic system according to claim 2, wherein: the second cross pouring channel is also provided with an auxiliary inner pouring channel, the auxiliary inner pouring channel transversely extends out of the second cross pouring channel, the height of the auxiliary inner pouring channel is smaller than that of the second cross pouring channel, and the inner pouring channel is vertically arranged on the auxiliary inner pouring channel.

6. The casting system in the injection molding machine mold locking hydraulic system according to claim 5, wherein: the two ingates are arranged in parallel and communicated with a platform on the reverse side of the bottom of the hydraulic cavity; the total cross-sectional area ratio of each main unit of the casting system is Sigma A _{Straight bar} ∶ΣA _{Transverse 1} ∶ΣA _{No. 2 horizontal} ∶ΣA _{1# inner} ∶ΣA _{Inner part} = 1.01-1.1: 1.3-1.5: 1; and a plurality of risers are arranged on the upper end surface of the hydraulic cavity.

7. The casting system in the injection molding machine mold locking hydraulic system according to claim 1, wherein: the molding sand layer include first molding sand layer and second molding sand layer, first molding sand level in the bottom in hydraulic pressure chamber, second molding sand level between lateral wall and the molding sand skeleton steel pipe in hydraulic pressure chamber.

8. The casting system in the injection molding machine mold locking hydraulic system according to claim 7, wherein: the thickness of the sand layer of the first sand layer is controlled to be 5-10 mm on a fillet line at the bottom of the hydraulic cavity; the thickness of the sand layer of the second type sand layer is controlled to be 15 mm-25 mm.

9. The casting system in the injection molding machine mold locking hydraulic system according to claim 7, wherein: the sand skeleton steel pipe is of a double-layer structure, a hollow interlayer is arranged in the middle of the double-layer structure, the hollow interlayer is provided with an air inlet and an air outlet for flowing air to flow, and the flowing air enters from the air inlet and flows out from the air outlet; the upper part of the hydraulic cavity is covered with a cope flask, and the molding sand framework steel pipe penetrates through the cope flask and extends into the hydraulic cavity; the upper end surface of the sand framework steel pipe protrudes out of the upper end surface of the cope flask.

10. The casting gating system in an injection molding machine mold clamping hydraulic system according to claim 9, wherein: the height of the sand layer of the cope box is 60 mm-100 mm; the molding sand layer is composed of casting sand and a molding sand binder.

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