CN220901858U - Sand control hole die casting die convenient to drawing of patterns - Google Patents

Abstract

The utility model aims to provide a die casting die with a sand-preventing hole, which comprises a front die assembly and a rear die assembly which are buckled with each other or separated, wherein the front die assembly comprises a front die holder and at least one insert pin, each insert pin is arranged on the front die holder, one side surface of the front die holder, which is close to the insert pin, is provided with at least one guide slot, the rear die assembly comprises a rear die holder, a sliding die plate, a stripper plate, a linkage piece, at least one ejector pin and at least one ejector pin, the sliding die plate is arranged on the rear die holder in a sliding manner, at least one feeding slot and at least one forming slot are arranged on the sliding die plate in a sliding manner, the stripper plate is arranged in the rear die holder in a sliding manner, the linkage piece is respectively connected with the stripper plate and the sliding die plate, one end of each ejector pin is arranged on the rear die holder, the other end of each ejector pin is arranged on the stripper plate in a penetrating manner so as to extend to each forming slot, one end of each ejector pin is arranged on the stripper plate, so that part of ejector pins extend to each guide slot respectively, and the rest ejector pins extend to each guide slot respectively.

Description

Sand control hole die casting die convenient to drawing of patterns

Technical Field

The utility model relates to the field of die casting dies, in particular to a die casting die with a sand prevention hole, which is convenient to demould.

Background

Die casting is a metal casting process, in which high pressure is applied to molten metal by using a die cavity so as to form a die casting with a specific shape in the die cavity. In the die casting process, as the outer surface of the die casting is tightly attached to the inner wall of the inner cavity of the die, a compact layer without sand holes is formed at the position 0.2-0.35 mm inward of the outer surface of the die casting, and the compact layer is also called as bread crust in the industry.

As shown in fig. 1, a finished die casting 20 for an automobile comprises a bottom block 21 and a cylinder 22 located at the center of the bottom block 21, and an extra processing thickness is required to be reserved for the cylinder 22 during die casting (i.e., an original die casting 30 in the drawing, the cylinder of the original die casting 30 has a larger diameter and a longer length than the cylinder of the finished die casting 20), and the original die casting 30 is formed into the finished die casting 20 by cutting off the extra part by a milling cutter.

Since the upper surface of the finished die casting 20 (the upper surface refers to the side surface of the bottom block 21 on the cylinder 22 and the surface of the cylinder 22) needs to be kept smooth, and no thimble print exists, when the die casting is performed in the conventional die casting die, the area of the cylinder 22 on the side of the bottom block 21 on the cylinder 22 is set to face the front die, and the side of the bottom block 21 away from the cylinder 22 faces the rear die, so that the side of the bottom block 21 away from the cylinder 22 is pushed by the thimble on the rear die to realize demolding.

However, the conventional die casting die has the following problems in actual die casting: since the axial center of the cylinder 22 is in an open-cell structure, one side of the cylinder 22 is set to face the front mold, and in order to smoothly pull the cylinder 22 out of the front mold, it is necessary to set the inner side wall and the outer side wall of the cylinder 22 to a larger draft angle. However, as mentioned above, the surface of the die casting will form a dense layer with a thickness of 0.2mm to 0.35mm, and in the existing die casting mold, the cylinder of the formed raw die casting 30 has an excessive draft angle due to the larger draft angle, and when the subsequent milling cutter cuts, the dense layer on the position of the cylinder 22 close to the bottom block 21 will be removed, and the sand hole will be exposed, thereby causing poor product; second, increasing the draft angle of the cylinder 22 means that a single raw die casting 30 requires more material to be charged, and more scrap is produced during the post-processing, thus greatly increasing the material cost and the cutting effort for the post-processing. In view of the above, in order to solve the above technical problems, the present application provides a die casting mold for facilitating demolding and sand prevention holes.

Disclosure of utility model

The utility model aims to overcome the defects in the prior art, and provides the die casting die with the sand control holes, which is convenient for die casting to be demolded, effectively avoids product defects caused by removing a compact layer in the post-processing of the die casting, simultaneously can reduce the material input of a single die casting, and can reduce the post-processing workload.

The aim of the utility model is realized by the following technical scheme:

the utility model provides a sand control hole die casting die convenient to drawing of patterns, includes front mould subassembly and back mould subassembly of mutual lock or separation:

The front die assembly comprises a front die holder and at least one insert pin, wherein each insert pin is arranged on the front die holder, so that at least part of the insert pin extends out of the bottom surface of the front die holder, and at least one guide groove is formed in one side surface, close to the insert pin, of the front die holder;

The rear die assembly comprises a rear die holder, a sliding die plate, a stripper plate, a linkage piece, at least one ejector sleeve and at least one ejector pin, wherein the sliding die plate is arranged on the rear die holder in a sliding manner along the normal direction of the top surface of the rear die holder, a side surface of the sliding die plate, which is far away from the rear die holder, is provided with at least one feeding groove and at least one forming groove which are mutually independent, the stripper plate is arranged in the rear die holder in a sliding manner along the normal direction of the top surface of the rear die holder, the linkage piece is respectively connected with the stripper plate and the sliding die plate, the stripper plate is used for driving the sliding die plate to synchronously slide for a preset distance through the linkage piece, one end of each ejector sleeve is arranged on the rear die holder, the other end of each ejector sleeve is arranged in the sliding die plate in a penetrating manner to extend into each forming groove respectively, and when the rear die piece and the front die piece are mutually buckled, the guide grooves and the forming grooves are sequentially communicated, the guide pins are respectively arranged in the stripper plate and the ejector pin extends to one end of each ejector pin.

Optionally, the bottom wall of guiding gutter is towards keeping away from the direction of slip form is sunken to form the pan feeding face, guide surface and the injection face that connect gradually, the pan feeding face with the feed chute intercommunication, the injection face with the shaping groove intercommunication.

Optionally, the guiding surface is an arc-shaped surface structure, and the feeding surface and the injection surface are both planar structures.

Optionally, an included angle between the injection surface and the top surface of the sliding template is 35-45 degrees.

Optionally, the cross-sectional area of the diversion trench gradually decreases from the guiding surface to the feeding/injecting surface.

Optionally, the linkage piece includes ejector pad, guide block, card lug and spring, the guide block set up in on the back die holder, just the guide block extends to on the slip form, the guiding hole has been seted up in the guide block, the card lug slide set up in on the slip form, the spring respectively with the card lug with slip form looks butt, the spring is used for the ejector pad, so that the card lug extends to at least part in the guiding hole, the one end of ejector pad set up in on the stripper plate, the other end of ejector pad wears to locate the guiding hole, so that the ejector pad the card lug.

Optionally, an inclined top surface is provided on the card bump, an inclined pushing surface is provided on the guide block, and the stripper plate is used for driving the push block to slide relative to the rear die holder, so that the push block drives the sliding die plate to slide relative to the rear die holder by a predetermined distance through the card bump, and the inclined pushing surface abuts against the inclined top surface, so that the card bump compresses the spring to retract into the sliding die plate, and the card bump is separated from the push block.

Optionally, two linkage pieces are provided, one end of each linkage piece is connected with two ends of the stripper plate respectively, and the other end of each linkage piece is connected with two ends of the slip form plate respectively.

Optionally, a distance is arranged between the end face of the insert needle located in the forming groove and the end face of the barrel located in the forming groove.

Optionally, a cold material groove is further formed in the sliding template, and the cold material groove is communicated with the forming groove.

Compared with the prior art, the utility model has at least the following advantages:

The utility model relates to a die casting die convenient for demolding sand control holes, which comprises a front die assembly and a rear die assembly which are buckled or separated with each other, wherein the front die assembly comprises a front die holder and at least one insert needle, each insert needle is arranged on the front die holder, so that at least part of the insert needle extends out of the bottom surface of the front die holder, one side surface of the front die holder, which is close to the insert needle, is provided with at least one guide slot, the rear die assembly comprises a rear die holder, a sliding die plate, a stripper plate, a linkage piece, at least one ejector barrel and at least one ejector pin, the sliding die plate is arranged on the rear die holder along the normal direction of the top surface of the rear die holder in a sliding manner, at least one forming slot and at least one forming slot are arranged on one side surface of the sliding die plate, which is far away from the rear die holder, the normal direction of the top surface of the rear die holder is provided with at least one guide slot and at least one forming slot, the linkage piece is respectively connected with the stripper plate and the sliding die plate, the stripper plate is used for driving the sliding die plate to slide a preset distance, one end of each ejector barrel is arranged on the rear die holder, and the other end of each ejector pin is respectively arranged on the ejector pin to extend to one end of each guide slot when the ejector pin is respectively connected with each guide slot in turn, and the ejector pin is respectively arranged at one end of the ejector pin and the ejector pin is respectively far away from one end of the ejector pin. Therefore, compared with the existing die-casting structure, the die-casting structure has the advantages that the die-casting structure can be smoothly demolded without reserving an excessive die-drawing angle for the cylinder, and the cutting amount in post-processing can be reduced, so that the workload of the post-processing can be reduced on the one hand, the material investment of a single die-casting can be reduced on the other hand, and more importantly, the problem that sand holes inside are exposed due to excessive cutting of a compact layer can be avoided, so that the production quality of the finished die-casting is effectively guaranteed.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of the structure of an original die casting and a finished die casting according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram of a die casting mold with sand control holes for facilitating demolding according to an embodiment of the present utility model;

FIG. 3 is a schematic cross-sectional view of the sand control hole die casting mold of FIG. 2 for facilitating demolding;

FIG. 4 is a schematic cross-sectional view of another angle of the sand control hole die casting mold shown in FIG. 2 for facilitating demolding;

FIG. 5 is a schematic view of the enlarged partial structure of FIG. 3A;

Fig. 6 is a schematic cross-sectional view of a linkage according to an embodiment of the present utility model.

Reference numerals illustrate:

10. The demolding and sand-preventing hole die casting die is convenient; 100. a front mold assembly; 200. a rear module assembly; 110. a front die holder; 120. inserting a needle; 111. a diversion trench; 210. a rear die holder; 220. a sliding template; 230. removing the template; 240. a linkage member; 250. a barrel; 260. a thimble; 221. a feed chute; 222. a forming groove; 1111. feeding surface; 1112. a guide surface; 1113. an injection surface; 241. a pushing block; 242. a guide block; 243. a card bump; 244. a spring; 2421. a guide hole; 2431. an inclined top surface; 2422. pushing the surface obliquely; 223. and a cold material groove.

Detailed Description

In order that the utility model may be readily understood, a more complete description of the utility model will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the utility model.

As shown in fig. 2 to 5, a die casting mold 10 with sand control holes convenient for demolding comprises a front mold assembly 100 and a rear mold assembly 200 which are buckled or separated mutually, wherein the front mold assembly 100 comprises a front mold base 110 and at least one insert pin 120, each insert pin 120 is arranged on the front mold base 110, at least part of the insert pin 120 extends out of the bottom surface of the front mold base 110, at least one guide groove 111 is formed on one side surface of the front mold base 110, which is close to the insert pin 120, the rear mold assembly 200 comprises a rear mold base 210, a sliding mold plate 220, a stripper plate 230, a linkage piece 240, at least one ejector tube 250 and at least one ejector pin 260, the sliding mold plate 220 is arranged on the rear mold base 210 along the normal sliding direction of the top surface of the rear mold base 210, at least one feeding groove 221 and at least one forming groove 222 which are mutually independent are formed on one side surface of the sliding mold plate 220, the stripper plate 230 is arranged in the rear mold base 210 along the normal sliding direction of the top surface of the rear mold base 210, the stripper plate 240 is respectively connected with the stripper plate 230 and the sliding mold plate 220, the stripper plate 230 is used for driving the ejector pins 250 to extend to one end of each guide groove 260, which is respectively arranged on one end of each guide groove 260 and the other end of each guide groove 260 is arranged on the front mold base 210, and the other end of each guide groove 260 is respectively, and the other end of each guide groove is respectively arranged at one end of the ejector pin 260 is extended to extend to one end of each guide groove 260, which is respectively arranged at one end of the front mold base 260 and is respectively, and is respectively extended to be respectively arranged at one end of the ejector pin 260, and is respectively, and one end is respectively, and one is used for forming.

It should be noted that, the front mold assembly 100 and the rear mold assembly 200 are respectively mounted on the die casting machine, wherein the front mold assembly 100 is fixedly mounted, and the rear mold assembly 200 is driven by the die casting machine to be buckled or separated from the front mold assembly 100. The molten metal die casting is die-cast into a mold through the front mold assembly 100. At least one insert pin 120 is mounted on the front die holder 110. The insert pin 120 is used for assisting the forming cylinder 22 to be close to the inner side wall of the bottom block 21. Further, at least one guiding groove 111 is provided on the front die holder 110 at the same side as the insert pin 120.

Further, for the rear mold assembly 200, the sliding mold plate 220 is slidably mounted along the normal direction of the rear mold base 210, wherein the normal direction of the top surface of the rear mold base 210 is a direction perpendicular to the top surface of the rear mold base 210, so that the sliding mold plate 220 can slide close to or far away from the rear mold base 210, and a feeding groove 221 and a forming groove 222 are formed on a side surface of the sliding mold plate 220 far away from the rear mold base 210, wherein the feeding groove 221 and the forming groove 222 are mutually independent. In an embodiment, a plurality of guide rods are mounted on the rear die holder 210 along the normal direction, and then a plurality of guide cylinders are mounted on the sliding die plate 220 and the front die holder 110, so that the guide rods are respectively mounted in a one-to-one fit manner with the guide cylinders, and the sliding die plate 220 can be buckled or separated in a sliding manner relative to the rear die holder 210, and the front die holder 110 can also be buckled or separated in a sliding manner relative to the rear die holder 210/the sliding die plate 220. The stripper plate 230 is also slidably mounted in the rear die holder 210 along a normal direction by guide posts. The linkage 240 is connected to the stripper plate 230 and the sliding plate 220, respectively, such that when the stripper plate 230 slides relative to the rear mold base 210, the sliding plate 220 can be driven to slide synchronously by the linkage 240 for a predetermined distance, and when the stripper plate 230 drives the sliding plate 220 to slide for a predetermined distance, the linkage 240 is separated from the sliding plate 220, so that the stripper plate 230 can slide independently, i.e. the stripper plate 230 can slide relative to the sliding plate 220 and the rear mold base 210. Further, one end of each barrel 250 is fixedly mounted on the rear die holder 210, and the other end of each barrel 250 passes through the sliding die plate 220, so that the top ends of the barrels 250 are respectively located in the forming grooves 222. One end of each thimble 260 is fixedly mounted on the stripper plate 230, and the other end of each thimble 260 passes through the sliding plate 220, so that the top end of part of the thimbles 260 is positioned in the feeding groove 221, and the top end of the rest of the thimbles 260 is positioned in the guide groove 111.

The operation of the sand control hole die casting mold 10 of the present application is described below. When the front mold assembly 100 and the rear mold assembly 200 are fastened together, the front mold base 110, the sliding mold plate 220, and the rear mold base 210 are fastened together, and are in a mold clamping state. In the clamped state, the front mold base 110 pushes the stripper plate 230 away from the front mold base 110 to achieve a reset. At this time, the feed chute 221, the guide chute 111, and the forming chute 222 are communicated with each other, and the feed chute 221, the guide chute 111, and the forming chute 222 are in a closed state, and when the metal die casting material is injected from the die casting machine, the metal die casting material is first injected into the feed chute 221 and then is injected into the forming chute 222 through the guide chute 111. It should be noted that, by setting the bottom wall of the diversion trench 111 to a certain radian and inclination, the metal die casting material can be flushed into the forming trench 222 from the diversion trench 111 at a certain diving angle, so that the metal die casting material can be rapidly filled in the forming trench 222 at a certain injection pressure, thereby effectively eliminating sand holes on the surface of the formed cylinder 22, and enabling the cylinder 22 to form a good compact layer. Further, when die casting is completed, parting is started at this time to take out the raw die cast piece 30. Specifically, first the front die holder 110 is away from the slide die plate 220. It should be noted that the insert pin 120 on the front die holder 110 is used for molding the lower surface of the finished die casting 20 (the side of the bottom block 21 away from the cylinder 22), and the lower surface of the finished die casting 20 has no deep groove structure, so that the front die holder 110 can be smoothly demolded from the lower surface of the finished die casting 20. After the front die holder 110 is demolded, the die casting machine applies a pushing force to the stripper plate 230. The sliding die plate 220 slides relative to the back die holder 210 in synchronization with the stripper plate 230 under the action of the linkage 240. Because the driver 250 and the rear die holder 210 are fixedly installed, when the die plate 220 drives the original die casting 30 to be far away from the rear die holder 210, the driver 250 slides out of the cylinder 22 on the original die casting 30, and thus, due to the disappearance of the tension force on the inner side wall of the cylinder 22, the cylinder 22 can form micro shrinkage deformation towards the axis direction, so that the outer side wall of the cylinder 22 and the inner side wall of the forming groove 222 have a tendency of separation. In addition, it should be noted that, since the barrel 250 passes through the slip-form plate 220, a gap exists between the barrel 250 and the slip-form plate 220, and thus, during the process of the metal die casting material entering the forming groove 222, the air portion of the forming groove 222 can overflow from the gap between the barrel 250 and the slip-form plate 220, so that the compact layer of the inner side wall of the formed cylinder 22 can be further improved, and the die casting quality can be improved. Further, after the slip-form plate 220 slides along the slip-form plate 230 by a predetermined distance, the slip-form plate 220 and the linkage 240 are separated from each other, so that the slip-form plate 230 can slide relative to the slip-form plate 220, and each thimble 260 mounted on the slip-form plate 230 can push the gate waste formed in the feed chute 221 and the guide chute 111, thereby pushing and demolding the original die casting 30 located in the forming chute 222. Thus, according to the die casting die 10 convenient for demoulding and sand preventing holes, the injection pressure and the injection angle of the metal die casting material entering the forming groove 222 are changed through the diversion groove 111, so that the metal die casting material can rapidly fill the forming groove 222, and the metal die casting material is prevented from forming reflux in the forming groove 222, so that the compact layer of the formed original die casting 30 is effectively ensured. Meanwhile, the stripper plate 230 is utilized to drive the sliding plate 220 to slide for a predetermined distance, so that the barrel 250 for forming the inner side wall of the cylinder 22 is withdrawn from the original die casting 30, after the adhesion force of the rear die holder 210 to the original die casting 30 is reduced, the ejector pins 260 push the water gap waste to simultaneously strip the original die casting 30 and the water gap waste. Thus, through the cylinder 22 that is with finished die casting 20 one side at the back mould shaping, compare in current die casting structure, need not reserve too big draft angle for cylinder 22 and just can smooth drawing of patterns, can reduce the cutting volume in the post-processing moreover, on the one hand can reduce the work load of post-processing, on the other hand can reduce the material input of single die casting, more importantly, can avoid exposing the problem of inside sand hole because of compact layer cutting is too much to effectively guarantee the production quality of finished die casting 20.

In an embodiment, the front mold base 110 is composed of a front mold base and a front mold core, for example, a mounting groove is formed on the front mold base, the front mold core is fixedly mounted in the mounting groove by using a screw, each insert pin 120 penetrates through the front mold core, each insert pin 120 is clamped and fixed by the front mold core and the front mold base together, and each guide groove 111 is located on the front mold core. Further, the sliding mold plate 220 is composed of a sliding mold frame and a sliding mold core, for example, a slot is also formed on the sliding mold frame, and the sliding mold core is installed in the slot of the sliding mold frame. Wherein the feeding groove 221 and the forming groove 222 are both positioned on the side surface of the sliding mold core away from the sliding mold frame.

As shown in fig. 5, in one embodiment, the bottom wall of the diversion trench 111 is recessed away from the sliding plate 220 to form a feeding surface 1111, a guiding surface 1112 and an injection surface 1113, which are sequentially connected, the feeding surface 1111 is communicated with the feeding trench 221, and the injection surface 1113 is communicated with the forming trench 222.

In order to avoid the pressure loss of the metal die casting material in the guide groove 111 and to enable the metal die casting material to be injected into the forming groove 222 at a better angle, the guide groove 111 is provided with a structure in which the feeding surface 1111, the guide surface 1112 and the injection surface 1113 are sequentially connected.

In one embodiment, the guide surface 1112 has an arcuate surface configuration, and the feed surface 1111 and the injection surface 1113 have a planar configuration. The cross-sectional area of the flow guide groove 111 gradually decreases from the guide surface 1112 toward the feed surface 1111/the injection surface 1113.

It should be noted that, when the metal die-casting material in the feeding chute 221 enters the position of the feeding surface 1111 and is guided by the arc structure of the guiding surface 1112, the impact angle of the metal die-casting material is adjusted. Further, the cross-sectional area of the flow guide groove 111 is a small, large, and small trend (note that the large and small is a comparison result obtained by comparing the positions of the flow guide groove 222 with each other, and does not relate to the numerical value of the specific area.) in the direction from the feed groove 221 to the forming groove 222, so, based on the principle that the smaller the aperture is, the larger the flow velocity is under the same flow effect, the stamping force of the metal die casting material from the flow guide groove 111 is adjusted. In this way, the metal die casting material can be punched into the forming groove 222 along the injection surface 1113 at a predetermined angle and punching force, thereby rapidly filling the forming groove 222, and forming a good compact layer on the surface of the formed raw die casting 30, thereby improving the die casting quality.

In one embodiment, as shown in FIG. 5, the angle D between the injection surface 1113 and the top surface of the slip form 220 is 35-45.

It should be noted that, for example, the angle D between the injection surface 1113 and the top surface of the sliding die plate 220 may be 36 °, 37 °, 38 °, 39 °, 40 °,41 °,42 °,43 °,44 °, or the like, so that the metal die casting material may be injected into the forming groove 222 at a specified angle.

As shown in fig. 2 and 6, in an embodiment, the linkage 240 includes a pushing block 241, a guiding block 242, a card protruding block 243 and a spring 244, the guiding block 242 is disposed on the rear die holder 210, the guiding block 242 extends onto the sliding die plate 220, a guiding hole 2421 is formed in the guiding block 242, the card protruding block 243 is slidably disposed on the sliding die plate 220, the spring 244 is respectively abutted against the card protruding block 243 and the sliding die plate 220, the spring 244 is used for pushing the card protruding block 243, so that the card protruding block 243 at least partially extends into the guiding hole 2421, one end of the pushing block 241 is disposed on the stripping die plate 230, and the other end of the pushing block 241 is penetrated into the guiding hole 2421, so that the pushing block 241 pushes the card protruding block 243.

It should be noted that, when the die casting machine pushes against the stripper plate 230, the stripper plate 230 drives the push block 241 to move, and the push block 241 pushes against the card bump 243 extending into the guide hole 2421, so that the stripper plate 230 slides together with the slide plate 220 relative to the back die holder 210 through the push block 241, and the driver 250 is withdrawn from the cylinder 22 of the die casting.

Further, as shown in fig. 6, in an embodiment, the inclined top surface 2431 is formed on the card bump 243, the inclined pushing surface 2422 is formed on the guide block 242, and when the stripper plate 230 is used for driving the push block 241 to slide relative to the rear die holder 210, the push block 241 drives the slide die plate 220 to slide relative to the rear die holder 210 by the card bump 243 by a predetermined distance, so that the inclined pushing surface 2422 abuts against the inclined top surface 2431, and the card bump 243 compresses the spring 244 to retract into the side wall of the slide die plate 220, so that the card bump 243 is separated from the push block 241.

It should be noted that, after the push block 241 pushes against the card bump 243 and slides a certain distance relative to the guide block 242, the inclined push surface 2422 pushes against the inclined top surface 2431, so that the card bump 243 is retracted into the sidewall of the sliding mold plate 220 under the pushing force, the push block 241 does not push against the card bump 243 any more, and therefore the stripper plate 230 is not linked with the sliding mold plate 220 any more, but the stripper plate 230 slides relative to the sliding mold plate 220, so that each thimble 260 installed on the stripper plate 230 pushes against the nozzle waste formed in the feed slot 221 and the guide slot 111, and the original die casting 30 is pushed against and stripped together with the nozzle waste.

In one embodiment, two linkage members 240 are provided, one ends of the two linkage members 240 are respectively connected to two ends of the stripper plate 230, and the other ends of the two linkage members 240 are respectively connected to two ends of the slip-form plate 220. Thus, by providing two links 240 to push the slip form 220 together, stability of the slip form 220 can be improved.

As shown in fig. 5, in one embodiment, a space E is provided between the end surface of the insert pin 120 located in the forming groove 222 and the end surface of the barrel 250 located in the forming groove 222.

The insert pin 120 and the barrel 250 are disposed with a space E therebetween, and the position of the product die casting 20 corresponding to the cylinder 22 is a through hole structure, so that during die casting, gas is pressed into the space E as the metal die casting is injected into the forming groove 222, and the space E provides a receiving area for gas, compared with the structure in which the insert pin 120 and the barrel 250 are in direct contact, and although sand holes are formed in a thin layer formed by the space E, the thin layer may be removed by post-processing. In this way, the quality of the dense layer of the inner side wall of the cylinder 22 can be further ensured, and sand holes are prevented from being formed on the surface.

In one embodiment, as shown in fig. 5, a cold material groove 223 is further formed on the sliding template 220, and the cold material groove 223 is communicated with the forming groove 222.

It should be noted that, the side of the forming groove 222 far away from the feeding groove 221 is further provided with a cooling groove 223, so that when the metal die casting is injected into the forming groove 222, the gas in the forming groove 222 is compressed into the cooling groove 223, so that the gas residue in the forming groove 222 is reduced, thereby avoiding the sand hole formed on the upper surface of the original die casting 30 and effectively improving the die casting quality. And form the mouth of a river waste material in feed chute 221 for the mouth of a river waste material is all formed around former die casting 30, when thimble 260 pushes away each mouth of a river waste material, can make former die casting 30 hand balance, thereby can pull out from shaping groove 222 better.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (10)

1. The utility model provides a sand control hole die casting die convenient to drawing of patterns, includes front mould subassembly and back mould subassembly of mutual lock or separation, its characterized in that:

The front die assembly comprises a front die holder and at least one insert pin, wherein each insert pin is arranged on the front die holder, so that at least part of the insert pin extends out of the bottom surface of the front die holder, and at least one guide groove is formed in one side surface, close to the insert pin, of the front die holder;

The rear die assembly comprises a rear die holder, a sliding die plate, a stripper plate, a linkage piece, at least one ejector sleeve and at least one ejector pin, wherein the sliding die plate is arranged on the rear die holder in a sliding manner along the normal direction of the top surface of the rear die holder, a side surface of the sliding die plate, which is far away from the rear die holder, is provided with at least one feeding groove and at least one forming groove which are mutually independent, the stripper plate is arranged in the rear die holder in a sliding manner along the normal direction of the top surface of the rear die holder, the linkage piece is respectively connected with the stripper plate and the sliding die plate, the stripper plate is used for driving the sliding die plate to synchronously slide for a preset distance through the linkage piece, one end of each ejector sleeve is arranged on the rear die holder, the other end of each ejector sleeve is arranged in the sliding die plate in a penetrating manner to extend into each forming groove respectively, and when the rear die piece and the front die piece are mutually buckled, the guide grooves and the forming grooves are sequentially communicated, the guide pins are respectively arranged in the stripper plate and the ejector pin extends to one end of each ejector pin.

2. The sand control hole die casting mold convenient for demolding as claimed in claim 1, wherein the bottom wall of the diversion trench is recessed away from the direction of the slip form to form a feeding surface, a guiding surface and an injection surface which are sequentially connected, the feeding surface is communicated with the feeding trench, and the injection surface is communicated with the molding trench.

3. The sand control hole die casting mold convenient for demolding as claimed in claim 2, wherein the guiding surface is of an arc-shaped surface structure, and the feeding surface and the injection surface are of a planar structure.

4. The sand control hole die casting mold for facilitating demolding as claimed in claim 3, wherein the included angle between the injection surface and the top surface of the slip form is 35 ° to 45 °.

5. The sand control hole die casting mold for facilitating demolding as claimed in claim 2, wherein the cross-sectional area of the flow guide groove is gradually reduced from the guide surface toward the feeding/injection surface.

6. The sand control hole die casting die convenient for demoulding according to any one of claims 1 to 5, wherein the linkage piece comprises a push block, a guide block, a clamping projection and a spring, the guide block is arranged on the rear die holder and extends to the sliding die plate, a guide hole is formed in the guide block, the clamping projection is slidably arranged on the sliding die plate, the spring is respectively abutted with the clamping projection and the sliding die plate, the spring is used for pushing the clamping projection so that the clamping projection at least partially extends into the guide hole, one end of the push block is arranged on the demoulding plate, and the other end of the push block penetrates through the guide hole so that the push block pushes the clamping projection.

7. The sand control hole die casting die convenient for demoulding of claim 6, wherein the clamping projection is provided with an inclined top surface, the guide block is provided with an inclined pushing surface, and the stripper plate is used for enabling the sliding block to drive the sliding die plate to slide relative to the rear die holder by a preset distance through the clamping projection after the sliding block is driven to slide relative to the rear die holder, so that the inclined pushing surface is abutted against the inclined top surface, and the clamping projection compresses the spring to retract into the sliding die plate, and further enables the clamping projection to be separated from the sliding block.

8. The sand control hole die casting mold convenient for demolding as claimed in claim 7, wherein two linkage members are arranged, one ends of the two linkage members are respectively connected with two ends of the demolding plate, and the other ends of the two linkage members are respectively connected with two ends of the sliding mold plate.

9. The sand control hole die casting mold convenient for demolding as claimed in claim 1, wherein a distance is arranged between the end face of the insert pin located in the molding groove and the end face of the driver located in the molding groove.

10. The sand control hole die casting die convenient for demoulding according to claim 1, wherein the sliding die plate is further provided with a cold material groove, and the cold material groove is communicated with the forming groove.