Forming die for casing type pouring gate

Abstract

The invention discloses a forming die for a casing pouring gate. The forming die comprises an upper die, a lower die, a flow dividing mechanism and a first locking mechanism. A pouring gate lower positioning groove is formed in the lower mold; the upper mold is provided with a pouring gate upper positioning groove, a first pouring gate through hole and a plurality of wax injection ports, and the wax injection ports are communicated with the pouring gate upper positioning groove; when the upper mold and the lower mold are closed, the pouring gate upper positioning groove and the pouring gate lower positioning groove can be oppositely closed to form a pouring gate positioning cavity which is used for positioning and installing a transverse core bar of a casing pouring gate, and a main core bar penetrates out of a first pouring gate penetrating hole of the upper mold; the shunting mechanism is arranged on the upper mold, an inlet of the shunting mechanism is used for injecting high-pressure wax liquid, and a plurality of shunting ports are communicated with a plurality of wax injection ports of the upper mold one by one, so that multi-channel wax injection of the pouring gate positioning cavity is realized; the first locking mechanism provides enough locking force for the upper mold and the lower mold when the upper mold and the lower mold are closed, so that the forming mold can realize high-pressure wax injection, and the problems caused by the fact that high-pressure wax injection cannot be used or low-pressure wax liquid injection is used can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of aero-engines, and particularly relates to a forming die for a casing-type runner. Background Art

[0002] With the development of large-thrust and high-thrust-to-weight-ratio aero-engines at home and abroad, higher requirements are put forward for the development of engine load-bearing casings with large sizes and high-precision dimensions. The gating system of large-size casing castings is complex, and the runner, as the core load-bearing part, plays a key role in the forming and surface quality of the entire casing casting. The casing-type runner structure consists of an intermediate main core plate (main core bone) + distributed transverse core bones, and the outer side is coated with 15-20 mm of low-temperature wax. The number of distributed core bones is mainly determined by the number of casing support plate structures. To ensure the safety of module fixation and smooth wax drainage, the size of the entire runner is often larger than the casing size.

[0003] In the existing wax injection molding technology for casing-type runners, the methods of bolt-locking the die and single-channel wax injection are generally adopted. Due to the small number of wax injection channels and insufficient clamping force provided by the clamping mechanism in such a forming method, high-pressure injection cannot be used, that is, high-pressure wax injection cannot be used. Often, the runner cannot be completely wax-injected and formed, resulting in insufficient integrity of the runner forming, accompanied by a series of defects such as incomplete local punching and excessive surface flow marks. A large amount of manual processing is required in batch production to change the use state. That is to say, since only low-pressure injection of wax liquid can be used in such a forming method, the injection pressure can generally only be set at 2 bar, and the required forming time is more than 300 s. During this process, a large amount of internal stress in the runner needs to be released, and the gas inside the die cannot be discharged and accumulates inside the runner. During the cooling process, the shrinkage stress is released and the pores are not filled solidly locally, resulting in cracking of the modeling wax coated on the outer surface of the runner, which in turn affects the forming quality of the shell mold in the subsequent shell-making process.

[0004] In addition, such a forming method is restricted by the workbench surface of the wax injection machine. Taking the MPI-150T wax injection machine as an example, the available effective area is: 1300*1200 (mm) in length and width. The size of the runner die cannot be larger than this size. However, the current mainstream design sizes of large airliner engine casings at home and abroad are all around 1400-1600 mm in diameter. Therefore, such a forming method cannot solve the forming problem of larger casing runners. Summary of the Invention

[0005] In view of this, the present invention provides a forming die for a casing-type runner, which can realize high-pressure wax injection, thereby helping to solve the problems caused by the inability to use high-pressure wax injection or the use of low-pressure injection of wax liquid.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A forming mold for a casing-type runner, comprising: an upper mold, a lower mold, a flow splitting mechanism, and a first locking mechanism;

[0008] The lower mold is provided with a runner lower positioning groove;

[0009] The upper mold is respectively provided with a runner upper positioning groove, a first runner perforation, and a plurality of wax injection ports. The plurality of wax injection ports are communicated with the runner upper positioning groove. Wherein, when the upper mold and the lower mold are closed, the runner upper positioning groove and the runner lower positioning groove can be aligned to form a runner positioning cavity, and are used for positioning and installing the horizontal core bone of the casing-type runner. The main core bone of the casing-type runner passes through the first runner perforation of the upper mold;

[0010] The flow splitting mechanism is arranged on the upper mold, and its inlet is used for injecting high-pressure wax liquid. A plurality of flow splitting ports are respectively communicated with the plurality of wax injection ports of the upper mold;

[0011] The first locking mechanism is used to provide sufficient locking force for the upper mold and the lower mold when the upper mold and the lower mold are closed.

[0012] Preferably, the plurality of wax injection ports are located at the top of the upper mold;

[0013] The flow splitting mechanism includes a flow splitting plate;

[0014] The flow splitting plate is arranged on the top of the upper mold, and is respectively provided with an inlet, a flow splitting channel, and a second runner perforation. Wherein, the inlet is communicated with the flow splitting channel; the flow splitting channel is located at the bottom of the flow splitting plate and is respectively communicated with the plurality of wax injection ports of the upper mold; the main core bone passes through the first runner perforation of the upper mold and the second runner perforation of the flow splitting plate in sequence.

[0015] Preferably, the flow splitting plate includes: a flow splitting bottom plate and a central column;

[0016] The flow splitting bottom plate is arranged on the top of the upper mold, and is respectively provided with the inlet and the flow splitting channel. The flow splitting channel is located at the bottom of the flow splitting bottom plate;

[0017] The central column is arranged on the top of the flow splitting bottom plate, and the second runner perforation penetrates through the central column and the flow splitting bottom plate.

[0018] Preferably, the plurality of wax injection ports are evenly distributed around the center of the top of the upper mold;

[0019] The flow splitting bottom plate is a circular bottom plate;

[0020] The flow splitting channel is an arc-shaped channel, and is concentric with the circular bottom plate, and its downward projection covers the plurality of wax injection ports on the top of the upper mold.

[0021] Preferably, the inlet is located at the top of the shunt bottom plate;

[0022] The forming die of the casing type runner further includes an external interface;

[0023] The external interface is arranged at the inlet of the shunt bottom plate and is used for docking and fixing with the external wax nozzle of the wax injection machine.

[0024] Preferably, the external interface includes: an external joint and a support;

[0025] The external joint is fixed to the inlet of the shunt bottom plate through the support, is provided with a through hole communicating with the inlet, and is used for inserting the external wax nozzle of the wax injection machine. An installation structure for cooperating with the anti - detachment mechanism of the external wax nozzle of the wax injection machine is also arranged on the outer side of the external joint, so that after the external wax nozzle is inserted into the through hole of the external joint, the anti - detachment mechanism of the external wax nozzle can be fixed to the outer side of the external joint.

[0026] Preferably, it further includes a second locking mechanism, which is used to provide sufficient locking force for the top of the shunt bottom plate and the upper die.

[0027] Preferably, the second locking mechanism includes: a second air inlet pipe, a second air outlet pipe, a second air passage control valve, and a plurality of second steel ball pneumatic locking mechanisms;

[0028] The second steel ball locking columns of the plurality of second steel ball pneumatic locking mechanisms are respectively embedded in the bottom of the shunt bottom plate, and the second locking rings are respectively embedded in the top of the upper die and are used for locking and cooperating with the plurality of second steel ball locking columns one by one;

[0029] The second air inlet pipe is arranged in the shunt bottom plate and is respectively communicated with the air inlets of the plurality of second steel ball locking columns;

[0030] The second air outlet pipe is arranged in the shunt bottom plate and is respectively communicated with the air outlets of the plurality of second steel ball locking columns;

[0031] The second air passage control valve is arranged on the shunt bottom plate, and its air inlet is used for connecting to an external air source and is communicated with the second air inlet pipe, and the air outlet is communicated with the second air outlet pipe and is used for discharging the external air source.

[0032] Preferably, the first locking mechanism includes: a first external air inlet pipe, a first external air outlet pipe, a first air passage control valve, and a plurality of first external steel ball pneumatic locking mechanisms;

[0033] The first outer steel ball locking columns of the plurality of first outer steel ball pneumatic locking mechanisms are respectively embedded in the top of the lower mold and distributed along the edge of the top of the lower mold. The first outer locking rings are respectively embedded in the bottom of the upper mold and used for locking and cooperating with the plurality of first outer steel ball locking columns one by one;

[0034] The first outer air inlet pipe is arranged in the lower mold and is respectively communicated with the air inlets of the plurality of first outer steel ball locking columns;

[0035] The first outer air outlet pipe is arranged in the lower mold and is respectively communicated with the air outlets of the plurality of first outer steel ball locking columns;

[0036] The first air passage control valve is arranged in the lower mold, and its air inlet is used to connect to an external air source and is communicated with the first outer air inlet pipe, and its air outlet is communicated with the first outer air outlet pipe and is used to discharge the external air source.

[0037] Preferably, the first locking mechanism further includes: a first inner air inlet pipe, a first inner air outlet pipe and a plurality of first inner steel ball pneumatic locking mechanisms;

[0038] The first inner steel ball locking columns of the plurality of first inner steel ball pneumatic locking mechanisms are respectively embedded in the top of the lower mold and distributed around the first runner perforation of the upper mold. The first inner locking rings are respectively embedded in the bottom of the upper mold and used for locking and cooperating with the plurality of first inner steel ball locking columns one by one;

[0039] The first inner air inlet pipe is arranged in the lower mold and is respectively communicated with the air inlets of the plurality of first inner steel ball locking columns;

[0040] The first inner air outlet pipe is arranged in the lower mold and is respectively communicated with the air outlets of the plurality of first inner steel ball locking columns;

[0041] The air inlet of the first air passage control valve is also communicated with the first inner air inlet pipe, and the air outlet is communicated with the first inner air outlet pipe.

[0042] As can be seen from the above technical solution, the molding die for the casing-type runner provided by the present invention has multiple shunt ports of the shunt mechanism communicating with multiple wax injection ports of the upper die one by one, enabling multi-channel wax injection into the runner positioning cavity, that is, shunt-type wax injection. Moreover, the first locking mechanism provides sufficient locking force for the upper die and the lower die when they are clamped, so that the molding die can achieve high-pressure wax injection, that is, high-pressure wax liquid can be injected into the horizontal core of the casing-type runner in the runner positioning cavity, which helps to solve the problems caused by the inability to use high-pressure wax injection or the use of low-pressure injection of wax liquid, namely, it helps to shorten the molding time, can obtain higher surface quality, avoid a large amount of manual surface repair work in the later stage, and the high injection pressure can also reduce the release of internal stress and avoid the risk of wax pattern cracking. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0044] Figure 1 Structural schematic diagram of the molding die for the casing-type runner provided by the embodiment of the present invention;

[0045] Figure 2 Exploded view of the structure of the molding die for the casing-type runner provided by the embodiment of the present invention;

[0046] Figure 3 Structural schematic diagram of the shunt plate provided by the embodiment of the present invention;

[0047] Figure 4 Bottom structural schematic diagram of the shunt plate provided by the embodiment of the present invention;

[0048] Figure 5 Structural schematic diagram of the upper die provided by the embodiment of the present invention;

[0049] Figure 6 Bottom structural schematic diagram of the upper die provided by the embodiment of the present invention;

[0050] Figure 7 Structural schematic diagram of the lower die provided by the embodiment of the present invention;

[0051] Figure 8 Pneumatic circuit structural schematic diagram of the second steel ball pneumatic locking mechanism provided by the embodiment of the present invention;

[0052] Figure 9Schematic diagram of the gas circuit structure of the first outer steel ball pneumatic locking mechanism and the first inner steel ball pneumatic locking mechanism provided by the embodiments of the present invention.

[0053] Among them, 1 is the main core bone, 2 is the outer interface, 3 is the first inner locking ring, 4 is the exhaust plate, 5 is the second airway control valve, 6 is the shunt plate, 7 is the first lifting ring, 8 is the second lifting ring, 9 is the wax injection port, 10 is the second locking ring, 11 is the upper mold, 12 is the cross core bone, 13 is the first airway control valve, 14 is the lower mold, 15 is the first outer steel ball locking column, 16 is the support column, 17 is the lower positioning groove of the runner, 18 is the upper positioning groove of the runner, 19 is the first runner perforation, 20 is the shunt runner, 21 is the shunt bottom plate, 22 is the central column, 23 is the outer joint, 24 is the support, 25 is the through hole, 26 is the second intake pipe, 27 is the second exhaust pipe, 28 is the second steel ball locking column, 29 is the first outer intake pipe, 30 is the first outer exhaust pipe, 31 is the first outer locking ring, 32 is the first inner intake pipe, 33 is the first inner exhaust pipe, 34 is the first inner steel ball locking column, 35 is the inlet, and 36 is the second runner perforation. Detailed implementation manners

[0054] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0055] The molding die for the runner of the casing type provided by the embodiments of the present invention, as Figure 1 and Figure 2 shown, includes: an upper mold 11, a lower mold 14, a shunt mechanism, and a first locking mechanism;

[0056] As Figure 7 shown, the lower mold 14 is provided with a lower positioning groove 17 of the runner;

[0057] As Figure 5 and Figure 6 shown, the upper mold 11 is respectively provided with an upper positioning groove 18 of the runner, a first runner perforation 19, and a plurality of wax injection ports 9, and the plurality of wax injection ports 9 are communicated with the upper positioning groove 18 of the runner; among them, when the upper mold 11 and the lower mold 14 are closed, the upper positioning groove 18 of the runner and the lower positioning groove of the runner can be aligned to form a runner positioning cavity for positioning and installing the cross core bone 12 of the casing type runner. As Figure 2 shown, the main core bone 1 of the casing type runner passes through the first runner perforation 19 of the upper mold 11;

[0058] The flow splitting mechanism is arranged on the upper mold 11, and its inlet is used for injecting high-pressure wax liquid. Multiple flow splitting ports are in one-to-one communication with multiple wax injection ports 9 of the upper mold 11;

[0059] The first locking mechanism is used to provide sufficient locking force for the upper mold 11 and the lower mold 14 when the upper mold 11 and the lower mold 14 are closed.

[0060] It should be noted that as Figure 7 shown, the lower mold 14 can be a lower template, and the runner lower positioning groove 17 can be located at the top of the lower mold 14; as Figure 5 shown, the upper mold 11 can be an upper template, as Figure 6 shown, the runner upper positioning groove 18 can be located at the bottom of the upper mold 11. Multiple wax injection ports 9 can be multiple wax injection through holes and are respectively in communication with the runner upper positioning groove 18. The first runner perforation 19 can be located in the middle of the upper mold 11. When the upper mold 11 and the lower mold 14 are aligned, the runner upper positioning groove 18 at the bottom of the upper mold 11 and the runner lower positioning groove 17 at the top of the lower mold 14 can be aligned to form a runner positioning cavity. This runner positioning cavity is used to position and install the horizontal core bone 12 of the casing runner. The main core bone 1 of the casing runner passes through the first runner perforation 19 of the upper mold 11. The flow splitting mechanism can be arranged at the top of the upper mold 11, and its multiple flow splitting ports can be located at the bottom of the flow splitting mechanism and are used to be in one-to-one communication with multiple wax injection ports 9 at the top of the upper mold 11, thereby realizing multi-channel wax injection into the runner positioning cavity. The first locking mechanism is used to lock the upper mold 11 and the lower mold 14 when the upper mold 11 and the lower mold 14 are closed and can provide sufficient locking force for the upper mold 11 and the lower mold 14 to ensure that during the high-pressure wax injection molding process, the upper mold 11 and the lower mold 14 remain firmly connected without wax leakage. Among them, the first locking mechanism can adopt a steel ball pneumatic locking mechanism, and details can be seen in the following description.

[0061] That is to say, for the molding die of the casing runner provided by this solution, through the one-to-one communication between multiple flow splitting ports of the flow splitting mechanism and multiple wax injection ports 9 of the upper mold 11, multi-channel wax injection into the runner positioning cavity can be realized, that is, split-type wax injection can be realized. Moreover, through the first locking mechanism, sufficient locking force is provided for the upper mold 11 and the lower mold 14 when the upper mold 11 and the lower mold 14 are closed, so that the molding die can realize high-pressure wax injection, that is, high-pressure wax liquid can be injected into the horizontal core bone 12 of the casing runner in the runner positioning cavity, which helps to solve the problems caused by the inability to use high-pressure wax injection or the use of low-pressure injection of wax liquid, that is, it helps to shorten the molding time, can obtain higher surface quality, avoid a large amount of later manual surface repair work, and the high injection pressure can also reduce the release of internal stress and avoid the risk of wax mold cracking. Of course, the molding die of the casing runner designed as above can enable the casing runner to be quickly molded under high-pressure and large-flow wax liquid, improving the efficiency while obtaining high-quality runner wax molds.

[0062] In this solution, as Figure 5 shown, multiple wax injection ports 9 are located at the top of the upper mold 11; among them, as described above, the wax injection port 9 is a wax injection through-hole, that is, it penetrates the bottom of the upper mold 11 and communicates with the positioning groove 18 on the runner.

[0063] As Figure 2 shown, the flow splitting mechanism includes a flow splitting plate 6;

[0064] As Figure 1 shown, the flow splitting plate 6 is arranged at the top of the upper mold 11. As Figure 3 and Figure 4 shown, the flow splitting plate 6 is respectively provided with an inlet 35, a flow splitting channel 20 and a second runner perforation 36; among them, the inlet 35 is communicated with the flow splitting channel 20; the flow splitting channel 20 is located at the bottom of the flow splitting plate 6 and is respectively communicated with multiple wax injection ports 9 of the upper mold 11; as Figure 2 shown, the main core 1 passes through the first runner perforation 19 of the upper mold 11 and the second runner perforation 36 of the flow splitting plate 6 in sequence. Among them, as Figure 3 shown, the inlet 35 can be a through-hole penetrating the top and bottom of the flow splitting plate 6, and is communicated with the flow splitting channel 20 at the bottom of the flow splitting plate 6, and is used for injecting high-pressure wax liquid; the flow splitting channel 20 at the bottom of the flow splitting plate 6 can be a curved flow channel and is respectively communicated with multiple wax injection ports 9 of the upper mold 11; of course, after the flow splitting plate 6 is fitted and installed on the top of the upper mold 1, the two can be locked through a locking mechanism to prevent high-pressure wax liquid from leaking between the flow splitting plate 6 and the upper mold 11, that is, to prevent wax overflow between the flow splitting plate 6 and the upper mold 11. That is to say, by communicating the flow splitting channel 20 at the bottom of the flow splitting plate 6 with multiple wax injection ports 9 at the top of the upper mold 11 respectively, the split-type wax injection of the runner positioning cavity can be realized, and this method has a simple structure and convenient flow splitting.

[0065] Specifically, as Figure 3 shown, the flow splitting plate 6 includes: a flow splitting bottom plate 21 and a central column 22;

[0066] As Figure 1 shown, the flow splitting bottom plate 21 is arranged at the top of the upper mold 11 and is respectively provided with an inlet 35 and a flow splitting channel 20. As Figure 4 shown, the flow splitting channel 20 is located at the bottom of the flow splitting bottom plate 21;

[0067] The central column 22 is arranged at the top of the flow splitting bottom plate 21, and the second runner perforation 36 penetrates through the central column 22 and the flow splitting bottom plate 21. Among them, the flow splitting bottom plate 21 can be fitted and installed on the top of the upper mold 11 and is respectively provided with the above-mentioned inlet 35 and flow splitting channel 36; as Figure 3As shown, the central column 22 can be arranged in the middle of the top of the shunt bottom plate 21, and the second runner perforation 36 penetrates through the central column 22 and the shunt bottom plate 21. That is to say, as Figure 3 shown, the shunt plate 6 includes: a bottom plate part (i.e., the shunt bottom plate 21) and a columnar part (i.e., the central column 22) arranged on the bottom plate part. That is, by providing a columnar part sleeved outside the main core bone 1, the installation of the casing runner in this forming die can be made more stable; of course, the central column 22 can also be equivalent to the limit column of the main core bone 1.

[0068] Furthermore, as Figure 5 shown, a plurality of wax injection ports 9 are evenly distributed around the center of the top of the upper die 11; among them, the upper die 11 can be a circular template;

[0069] As Figure 3 shown, the shunt bottom plate 21 is a circular bottom plate;

[0070] As Figure 4 shown, the shunt runner 20 is an arc-shaped runner, and is concentric with the circular bottom plate, and its downward projection covers a plurality of wax injection ports 9 on the top of the upper die 11. Among them, the shunt runner 20 can be an arc-shaped runner with a radian of 270°. The downward projection of this arc-shaped runner covers a plurality of wax injection ports 9 on the top of the upper die 11. That is, the radius of the arc-shaped runner is equal to the radius of the circle formed by the plurality of wax injection ports 9, so that the arc-shaped runner can be respectively communicated with a plurality of evenly distributed wax injection ports 9 on the top of the upper die 11, thereby ensuring the balance of shunt wax injection, that is, ensuring that multiple paths of wax liquid can be evenly injected into the runner positioning cavity of the die. That is to say, the molten wax liquid is shunted to a plurality of evenly distributed wax injection ports 9 on the top of the upper die 11 through the arc-shaped runner of the shunt plate 6, and then multiple paths of wax liquid are evenly injected into the runner positioning cavity of the die. This can not only enable the modeling wax to be quickly filled, but also maximize the injection balance, improve the forming stability, and avoid the risk of wax mold cracking. In addition, the Moldflow simulation software can be used to carry out computer simulation of the flow process of the modeling wax in the die, determine the positions of the four wax injection ports 9 in the radial direction in the die, maximize the wax injection balance, and at the same time ensure that there is enough installation space for the locking mechanism between the shunt plate 6 and the upper die 11; of course, the number of wax injection ports 9 can be 3 - 6.

[0071] Furthermore, as Figure 3 shown, the inlet 35 is located at the top of the shunt bottom plate 21;

[0072] As Figure 2 shown, the forming die of the casing runner further includes an external interface 2;

[0073] The external interface 2 is arranged at the inlet 35 of the shunt bottom plate 21 and is used for docking and fixing with the external wax nozzle of the wax injection machine. Among them, the external interface 2 is arranged on the end face of the inlet 35 of the shunt bottom plate 21, communicates with the inlet 35 of the shunt bottom plate 21, and is used for docking and fixing with the external wax nozzle of the wax injection machine. At this time, the mold is independent of the wax injection machine, rather than the traditional injection molding by the up-and-down pressing of the wax injection machine. That is to say, the inlet 35 of the flow divider plate 6 can be used to dock and fix with the external wax nozzle of the wax injection machine through the external interface 2, so that the wax inlet of this mold is docked with the external wax nozzle of the wax injection machine to form a unique discrete wax injection method, so that the runner forming mold of the casing type can no longer be restricted by the tonnage and size of the wax injection machine, and the design and molding of the large-size casing type runner can be realized.

[0074] In this solution, as Figure 1 shown, the external interface 2 includes: an external joint 23 and a support 24;

[0075] The external joint 23 is fixed to the inlet 35 of the shunt bottom plate 21 through the support 24, is provided with a through hole 25 communicating with the inlet 35, and is used for inserting the external wax nozzle of the wax injection machine. An installation structure for cooperating with the anti-detachment mechanism of the external wax nozzle of the wax injection machine is also provided on the outer side of the external joint 23, so that after the external wax nozzle is inserted into the through hole 25 of the external joint 23, the anti-detachment mechanism of the external wax nozzle can be fixed to the outer side of the external joint 23.

[0076] Among them, the external joint 23 is fixed to the end face of the inlet 35 of the shunt bottom plate 21 through the support 24, and its through hole 25 communicating with the inlet 35 is used for the insertion of the external wax nozzle of the wax injection machine to realize the docking insertion of the external wax nozzle of the wax injection machine and the external interface 2; in order to prevent the external wax nozzle of the wax injection machine from falling off after being inserted, it is necessary for the anti-detachment mechanism of the external wax nozzle of the wax injection machine to be fixed to the external joint 23; for this reason, a clamping structure for cooperating with the anti-detachment mechanism of the external wax nozzle of the wax injection machine can be provided on the outer side of the external joint 23, so that after the external wax nozzle is inserted into the through hole 25 of the external joint 23, the anti-detachment mechanism of the external wax nozzle can be clamped to the outer side of the external joint 23; among them, as Figure 1 shown, the external joint 23 can be a cylindrical structure, and a clamping ring can be provided on the outer peripheral wall of the middle part thereof; the anti-detachment mechanism of the external wax nozzle is a C-shaped locking buckle; more specifically, first fix the C-shaped locking buckle to the external wax nozzle of the wax injection machine, then insert the external wax nozzle into the through hole 25 of the external joint 23, and then snap the C-shaped locking buckle into the clamping ring of the external joint 23 and tighten the C-shaped locking buckle to clamp the clamping ring of the external joint 23, and then lift the locking buckle through the hydraulic rod device so that the C-shaped locking buckle abuts against the upper end face of the clamping ring of the external joint 23, so that the external wax nozzle of the wax injection machine can be fixed in the through hole 25 of the external joint 23, so that the wax nozzle can be prevented from falling off due to pressure during the wax injection process; of course, the anti-detachment mechanism of the external wax nozzle is a supporting mechanism of the wax injection machine.

[0077] Specifically, the forming die for the casing-type runner provided in the embodiment of the present invention further includes a second locking mechanism, which is used to provide sufficient locking force for the top of the shunt bottom plate 21 and the upper die 11, ensuring that sufficient clamping force can be obtained between the shunt bottom plate 21 and the upper die 11 during the high-pressure shunt wax injection molding process, avoiding the leakage of wax liquid between the shunt bottom plate 21 and the upper die 11, and thus ensuring that there is no wax overflow between the shunt bottom plate 21 and the upper die 11 during the injection process; of course, the second locking mechanism can also adopt a steel ball pneumatic locking mechanism, and the details can be seen in the following description.

[0078] Further, as Figure 8 shown, the second locking mechanism includes: a second air inlet pipe 26, a second air outlet pipe 27, a second air passage control valve 5, and a plurality of second steel ball pneumatic locking mechanisms;

[0079] As Figure 4 shown, the second steel ball locking columns 28 of the plurality of second steel ball pneumatic locking mechanisms are respectively embedded in the bottom of the shunt bottom plate 21. As Figure 5 shown, the second locking rings 10 are respectively embedded in the top of the upper die 11 and are used for locking and cooperating with the plurality of second steel ball locking columns 28 one by one;

[0080] As [[ID=((18))]] Figure 8 shown, the second air inlet pipe 26 is arranged in the shunt bottom plate 21 and is respectively communicated with the air inlets of the plurality of second steel ball locking columns 28;

[0081] The second air outlet pipe 27 is arranged in the shunt bottom plate 21 and is respectively communicated with the air outlets of the plurality of second steel ball locking columns 28;

[0082] As Figure 2 shown, the second air passage control valve 5 is arranged on the shunt bottom plate 21, and its air inlet is used to connect to an external air source and is communicated with the second air inlet pipe 26, and the air outlet is communicated with the second air outlet pipe 27 and is used to discharge the external air source.

[0083] Among them, as Figure 4 shown, the plurality of second steel ball locking columns 28 embedded in the bottom of the shunt bottom plate 21 can be evenly distributed around the center of the shunt bottom plate 21. As Figure 5 shown, the plurality of second locking rings 10 embedded in the top of the upper die 11 can also be evenly distributed around the center of the upper die 11. Of course, they are also aligned with the plurality of second steel ball locking columns 28 one by one. Moreover, the locking columns of the plurality of second steel ball locking columns 28 protrude from the bottom of the shunt bottom plate 21, facilitating being respectively snapped into and locked with the plurality of second locking rings 10 on the top of the upper die 11. The number of the second steel ball locking columns 28 and the second locking rings 10 can both be three; as Figure 8As shown in the figure, the second intake air pipe 26 and the second exhaust air pipe 27 can both be circular air pipes, and are respectively built into the flow dividing bottom plate 21. Two circular air pipe installation grooves are correspondingly provided in the flow dividing bottom plate 21. One air pipe installation groove is used to install the second intake air pipe 26, and the other air pipe installation groove is used to install the second exhaust air pipe 27; As Figure 2 shown in the figure, the second air passage control valve 5 can be arranged on the top of the flow dividing bottom plate 21. The air inlet of the second air passage control valve 5 is used to connect to an external air source and is communicated with the circular second intake air pipe 26. The air outlet is communicated with the circular second exhaust air pipe 27 and is used to discharge the external air source. Of course, the second air passage control valve 5 can control the on-off of its air inlet, and thus is used to control the on-off of the second intake air pipe 26, and is also used to control the opening and closing of multiple second steel ball pneumatic locking mechanisms, and further used to control the locking and unlocking between the flow dividing bottom plate 21 and the upper mold 11; Of course, based on the one-to-one clamping of multiple second steel ball locking columns 28 and multiple second locking rings 10, multiple second steel ball pneumatic locking mechanisms also have a high-precision positioning function, and it is convenient to control the locking and unlocking between the flow dividing bottom plate 21 and the upper mold 11 through the second air passage control valve 5, and it breaks away from the limitations of traditional screw locking. It has a large locking force and a high reuse rate; In addition, multiple second steel ball pneumatic locking mechanisms are embedded between the flow dividing bottom plate 21 and the upper mold 11, and the second intake air pipe 26 and the second exhaust air pipe 27 are respectively built into the flow dividing bottom plate 21, so that the structure of the second locking mechanism can be more compact.

[0084] Furthermore, as Figure 9 shown in the figure, the first locking mechanism includes: a first external intake air pipe 29, a first external exhaust air pipe 30, a first air passage control valve 13 and multiple first external steel ball pneumatic locking mechanisms;

[0085] As Figure 7 shown in the figure, the first external steel ball locking columns 15 of multiple first external steel ball pneumatic locking mechanisms are respectively embedded in the top of the lower mold 14 and are distributed along the edge of the top of the lower mold 14. As Figure 6 shown in the figure, the first external locking rings 31 are respectively embedded in the bottom of the upper mold 11 and are used for one-to-one locking cooperation with multiple first external steel ball locking columns 15;

[0086] As Figure 9 shown in the figure, the first external intake air pipe 29 is arranged in the lower mold 14 and is respectively communicated with the air inlets of multiple first external steel ball locking columns 15;

[0087] The first external exhaust air pipe 30 is arranged in the lower mold 14 and is respectively communicated with the air outlets of multiple first external steel ball locking columns 15;

[0088] As Figure 2As shown, the first air passage control valve 13 is arranged on the side wall of the lower mold 14, and its air inlet is used to connect to an external air source and communicate with the first external intake pipe 29, and the air outlet communicates with the first external outlet pipe 30 and is used to discharge the external air source.

[0089] Among them, as Figure 7 shown, a plurality of first external steel ball locking columns 15 embedded in the top of the lower mold 14 can be evenly distributed around the center of the top of the lower mold 14. As Figure 6 shown, a plurality of first external locking rings 31 embedded in the bottom of the upper mold 11 can also be evenly distributed around the center of the bottom of the upper mold 11. Of course, they are also in one-to-one alignment with the plurality of first external steel ball locking columns 15. Moreover, the locking columns of the plurality of first external steel ball locking columns 15 protrude from the top of the lower mold 14, facilitating being snapped into and locked with the plurality of first external locking rings 31 at the bottom of the upper mold 11. The number of the first external steel ball locking columns 15 and the first external locking rings 31 can both be six. As Figure 9 shown, the first external intake pipe 29 and the first external outlet pipe 30 can both be circular air pipes and are respectively placed inside the lower mold 14. Two circular external air pipe installation grooves are correspondingly arranged inside the lower mold 14. One external air pipe installation groove is used to install the first external intake pipe 29, and the other external air pipe installation groove is used to install the first external outlet pipe 30. The first air passage control valve 13 can be arranged on the outer side wall of the lower mold 14. The air inlet of the first air passage control valve 13 is used to connect to an external air source and communicate with the circular first external intake pipe 29, and the air outlet communicates with the circular first external outlet pipe 30 and is used to discharge the external air source. Of course, the first air passage control valve 13 can control the on-off of its air inlet, and thus is used to control the on-off of the first external intake pipe 29, and also used to control the opening and closing of the plurality of first external steel ball pneumatic locking mechanisms, and further used to control the locking and unlocking between the outer edges (outer rings) of the upper mold 11 and the lower mold 14. Of course, based on the one-to-one clamping of the plurality of first external steel ball locking columns 15 and the plurality of first external locking rings 31, the plurality of first external steel ball pneumatic locking mechanisms can have a high-precision positioning function. Moreover, it is convenient to control the locking and unlocking between the outer edges of the upper mold 11 and the lower mold 14 through the first air passage control valve 13, and it breaks away from the limitations of traditional screw locking. It has a large locking force and a high reuse rate. In addition, the plurality of first external steel ball pneumatic locking mechanisms are embedded between the outer edges (outer rings) of the upper mold 11 and the lower mold 14, and the first external intake pipe 29 and the first external outlet pipe 30 are respectively placed inside the lower mold 14, which can make the structure of the plurality of first external steel ball pneumatic locking mechanisms more compact.

[0090] In this solution, as Figure 9 shown, the first locking mechanism further includes: a first internal intake pipe 32, a first internal outlet pipe 33, and a plurality of first internal steel ball pneumatic locking mechanisms;

[0091] As Figure 7As shown, the first inner steel ball locking columns 34 of multiple first inner steel ball pneumatic locking mechanisms are respectively embedded in the top of the lower mold 14 and are distributed around the first runner perforation 19 of the upper mold 11. Figure 6 As shown, the first inner locking rings 3 are respectively embedded in the bottom of the upper mold 11 and are used for locking and cooperating with the multiple first inner steel ball locking columns 34 one by one.

[0092] As Figure 9 shown, the first inner air inlet pipes 32 are arranged in the lower mold 14 and are respectively communicated with the air inlets of the multiple first inner steel ball locking columns 34.

[0093] As Figure 9 shown, the first inner air outlet pipes 33 are arranged in the lower mold 14 and are respectively communicated with the air outlets of the multiple first inner steel ball locking columns 34.

[0094] The air inlet of the first air passage control valve 13 is also communicated with the first inner air inlet pipe 32, and the air outlet is communicated with the first inner air outlet pipe 33.

[0095] Among them, as Figure 7 shown, the multiple first inner steel ball locking columns 34 embedded in the top of the lower mold 14 can be evenly distributed near and around the center of the top of the lower mold 14. As Figure 6 shown, the multiple first inner locking rings 3 embedded in the bottom of the upper mold 11 can also be evenly distributed around the center of the bottom of the upper mold 11. Of course, they are also aligned with the multiple first inner steel ball locking columns 34 one by one. Moreover, the locking columns of the multiple first inner steel ball locking columns 34 protrude from the top of the lower mold 14, facilitating being respectively snapped into and locked with the multiple first inner locking rings 3 at the bottom of the upper mold 11. The number of the first inner steel ball locking columns 34 and the first inner locking rings 3 can both be three. As Figure 9As shown in the figure, the first inner intake pipe 32 and the first inner outlet pipe 33 can both be circular ring-shaped air pipes and are respectively placed inside the lower mold 14. Two circular ring-shaped inner air pipe installation grooves are correspondingly arranged inside the lower mold 14. One inner air pipe installation groove is used to install the first inner intake pipe 32, and the other inner air pipe installation groove is used to install the first inner outlet pipe 33. The first air passage control valve 13 can also be used to control the on-off of the first inner intake pipe 32, that is, to control the opening and closing of multiple first inner steel ball pneumatic locking mechanisms, and further to control the locking and unlocking between the inner rings of the upper mold 11 and the lower mold 14. Of course, based on the one-to-one clamping of multiple first inner steel ball locking columns 34 and multiple first inner locking rings 3, multiple first inner steel ball pneumatic locking mechanisms can have a high-precision positioning function. Moreover, it is convenient to control the locking and unlocking between the inner rings of the upper mold 11 and the lower mold 14 through the first air passage control valve 13, and it breaks away from the limitations of traditional screw locking. It has a large locking force and a high reuse rate. In addition, multiple first inner steel ball pneumatic locking mechanisms are embedded between the inner rings of the upper mold 11 and the lower mold 14, and the first inner intake pipe 32 and the first inner outlet pipe 33 are respectively placed inside the lower mold 14, which can make the structure of multiple first inner steel ball pneumatic locking mechanisms more compact.

[0096] That is to say, the first locking mechanism includes: multiple first outer steel ball pneumatic locking mechanisms embedded between the outer rings of the upper mold 11 and the lower mold 14, and multiple first inner steel ball pneumatic locking mechanisms embedded between the inner rings of the upper mold 11 and the lower mold 14. This can greatly enhance the locking force between the upper mold 11 and the lower mold 14, provide a clamping force of more than 140t under an injection pressure of 40 bar, complete the filling in 10s, shorten the wax injection time, obtain a higher surface quality, avoid a large amount of later manual surface repair work, and the high injection pressure can reduce the release of internal stress and avoid the risk of wax mold cracking.

[0097] Among them, 6 first outer steel ball pneumatic locking mechanisms are evenly arranged between the outer rings of the upper mold 11 and the lower mold 14, and 3 first inner steel ball pneumatic locking mechanisms are evenly arranged between the inner rings. The head of the steel ball pneumatic locking mechanism has a 3° slope, and the repeat positioning accuracy can reach 0.08mm. The locking column of each steel ball pneumatic locking mechanism can provide a locking force of about 12T. The steel ball pneumatic locking mechanism provides a clamping force by pneumatically squeezing the steel balls. The locking columns of each steel ball pneumatic locking mechanism are connected by two kinds of air pipes, namely intake and outlet air pipes. These two kinds of air pipes are distributed in the installation grooves at the bottom of the lower template. All the air pipes are respectively connected to the corresponding air passage control valves, and the locking and mold opening processes of the upper and lower molds are controlled through the air passage control valves. In each steel ball pneumatic locking mechanism, the steel balls are pneumatically pushed outwards to squeeze the locking ring, realizing the locking between the steel ball locking column and the steel ball locking ring.

[0098] In addition, in the existing molding methods, due to the cumbersome operation steps of the locking mechanism, it is necessary to repeatedly lock to ensure that there is no wax overflow during the injection process. The high-frequency use of the locking bolts, the wear of the mold templates, and the wear of the screw threads all lead to a decrease in the mold life and problems such as insufficient accuracy in the runner molding. The locking mechanism provided by this solution can solve the above problems.

[0099] In addition, when the wax pattern is filled in the runner positioning cavity of the mold, the discharge of gas directly affects the molding and surface quality. As Figure 2 shown, an exhaust plate 4 can be provided on the manifold plate 6. An overflow groove with a depth of 0.5 mm is machined in the exhaust plate 4. The depth dimension at the main core of the runner is large, so the design of the exhaust plate 4 here helps to improve the overall molding quality. Among them, the overflow groove is close to the main core to collect the gas discharged from the mold and prevent the air from being trapped due to untimely gas discharge. The groove depth is 0.5 mm.

[0100] At the same time, it should also be noted that as Figure 2 shown, a first lifting ring 7 is also provided on the manifold plate 6, and a plurality of second lifting rings 8 are also provided on the upper mold 11. After the mold is pressure-maintained, the molded runner is taken out by opening the mold through the lifting rings.

[0101] A plurality of support columns 16 are provided at the bottom of the lower mold 14. The height of the support columns 16 is about 150 mm, so that a certain distance is formed between the mold and the ground, which is convenient for mold transfer.

[0102] In the specific implementation process, it was also found that taking the wax injection machine MPI-150T as an example, using the two-stage injection mode for molding can reduce the molding cycle at a maximum injection speed of 970 cm³ / S and obtain a high-quality surface of the wax pattern. It can be executed according to the following parameters:

[0103] Use 3D software to calculate the total volume of the runner filling part;

[0104] In the control of the wax injection machine system, select the flow mode, and set: the punching pressure is 70 bar, the flow rate is 970 cm³ / S, the pressure conversion is set to: 70% of the total volume, and the pressure-maintaining pressure is 10 bar.

[0105] That is to say, the molding die provided by this solution is a brand-new die structure, which is used to solve the problems of poor molding quality, low efficiency, and high frequency of mold maintenance in the existing technology.

[0106] In this specification, each embodiment is described in a progressive manner. The key points of each embodiment are the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other.

[0107] The foregoing description of the disclosed embodiments enables those skilled in the art to practice or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A forming mold for a runner of a casing class, characterized in that, Comprising: an upper mold (11), a lower mold (14), a flow splitting mechanism, and a first locking mechanism; a runner lower positioning groove (17) is formed in the lower mold (14); the upper mold (11) is respectively provided with a runner upper positioning groove (18), a first runner perforation (19), and a plurality of wax injection ports (9), and the plurality of wax injection ports (9) communicate with the runner upper positioning groove (18); wherein, when the upper mold (11) and the lower mold (14) are clamped, the runner upper positioning groove (18) and the runner lower positioning groove (17) can be aligned to form a runner positioning cavity, and are used for positioning and installing a horizontal core bar (12) of the casing runner, and a main core bar (1) of the casing runner passes through the first runner perforation (19) of the upper mold (11); the flow splitting mechanism is arranged on the upper mold (11), and its inlet is used for injecting high-pressure wax liquid, and a plurality of flow splitting ports communicate with the plurality of wax injection ports (9) of the upper mold (11) one by one; the first locking mechanism is used to provide sufficient locking force for the upper mold (11) and the lower mold (14) when the upper mold (11) and the lower mold (14) are clamped.

2. The forming die for the runner of the casing class according to claim 1, characterized in that The plurality of wax injection ports (9) are located at the top of the upper mold (11); the flow splitting mechanism includes a flow splitting plate (6); the flow splitting plate (6) is arranged at the top of the upper mold (11), and is respectively provided with an inlet, a flow splitting channel (20), and a second runner perforation; wherein, the inlet communicates with the flow splitting channel (20); the flow splitting channel (20) is located at the bottom of the flow splitting plate (6), and communicates with the plurality of wax injection ports (9) of the upper mold (11) respectively; the main core bar (1) passes through the first runner perforation (19) of the upper mold (11) and the second runner perforation of the flow splitting plate (6) in sequence.

3. The forming die for the runner of the casing class according to claim 2, characterized in that, The flow splitting plate (6) includes: a flow splitting bottom plate (21) and a central column (22); the flow splitting bottom plate (21) is arranged at the top of the upper mold (11), and is respectively provided with the inlet and the flow splitting channel (20), and the flow splitting channel (20) is located at the bottom of the flow splitting bottom plate (21); the central column (22) is arranged at the top of the flow splitting bottom plate (21), and the second runner perforation penetrates through the central column (22) and the flow splitting bottom plate (21).

4. The forming die for the runner of the casing class according to claim 3, characterized in that The plurality of wax injection ports (9) are evenly distributed around the center of the top of the upper mold (11); the flow splitting bottom plate (21) is a circular bottom plate; the flow splitting channel (20) is an arc-shaped channel, and is concentric with the circular bottom plate, and its downward projection covers the plurality of wax injection ports (9) at the top of the upper mold (11).

5. The forming die for the runner of the casing type according to claim 3, characterized in that, The inlet is located at the top of the flow splitting bottom plate (21); the forming mold of the casing runner further includes an external interface (2); the external interface (2) is arranged at the inlet of the flow splitting bottom plate (21), and is used for docking and fixing with an external wax nozzle of a wax injection machine.

6. The forming die for the runner of the casing type according to claim 5, characterized in that, The external interface (2) includes: an external joint (23) and a support (24); The external joint (23) is fixed to the inlet of the flow splitting bottom plate (21) through the support (24), is provided with a through hole (25) communicating with the inlet, and is used for inserting an external wax nozzle of the wax injection machine. An installation structure for cooperating with the anti - detachment mechanism of the external wax nozzle of the wax injection machine is further provided on the outer side of the external joint (23), so that after the external wax nozzle is inserted into the through hole (25) of the external joint (23), the anti - detachment mechanism of the external wax nozzle can be fixed to the outer side of the external joint (23).

7. The forming die for the runner of the casing type according to claim 3, characterized in that, It further includes a second locking mechanism, which is used to provide sufficient locking force for the top of the flow splitting bottom plate (21) and the upper mold (11).

8. The forming die for the runner of the casing type according to claim 7, characterized in that, The second locking mechanism includes: a second air inlet pipe (26), a second air outlet pipe (27), a second air channel control valve (5) and a plurality of second steel ball pneumatic locking mechanisms; The second steel ball locking columns (28) of the plurality of second steel ball pneumatic locking mechanisms are respectively embedded in the bottom of the flow splitting bottom plate (21), and the second locking rings (10) are respectively embedded in the top of the upper mold (11) and are used for locking and cooperating with the plurality of second steel ball locking columns (28) one by one; The second air inlet pipe (26) is arranged in the flow splitting bottom plate (21) and is respectively communicated with the air inlets of the plurality of second steel ball locking columns (28); The second air outlet pipe (27) is arranged in the flow splitting bottom plate (21) and is respectively communicated with the air outlets of the plurality of second steel ball locking columns (28); The second air channel control valve (5) is arranged on the flow splitting bottom plate (21), and its air inlet is used for connecting to an external air source and is communicated with the second air inlet pipe (26), and the air outlet is communicated with the second air outlet pipe (27) and is used for discharging the external air source.

9. The forming die for the runner of the casing class according to claim 1, characterized in that The first locking mechanism includes: a first external air inlet pipe (29), a first external air outlet pipe (30), a first air channel control valve (13) and a plurality of first external steel ball pneumatic locking mechanisms; The first external steel ball locking columns (15) of the plurality of first external steel ball pneumatic locking mechanisms are respectively embedded in the top of the lower mold (14) and are distributed along the edge of the top of the lower mold (14). The first external locking rings (31) are respectively embedded in the bottom of the upper mold (11) and are used for locking and cooperating with the plurality of first external steel ball locking columns (15) one by one; The first external air inlet pipe (29) is arranged in the lower mold (14) and is respectively communicated with the air inlets of the plurality of first external steel ball locking columns (15); The first external air outlet pipe (30) is arranged in the lower mold (14) and is respectively communicated with the air outlets of the plurality of first external steel ball locking columns (15); The first air channel control valve (13) is arranged on the lower mold (14), and its air inlet is used for connecting to an external air source and is communicated with the first external air inlet pipe (29), and the air outlet is communicated with the first external air outlet pipe (30) and is used for discharging the external air source.

10. The forming die for the runner of the casing class according to claim 9, characterized in that, The first locking mechanism further includes: a first internal air inlet pipe (32), a first internal air outlet pipe (33) and a plurality of first internal steel ball pneumatic locking mechanisms; The first inner steel ball locking columns (34) of multiple said first inner steel ball pneumatic locking mechanisms are respectively embedded in the top of the lower mold (14) and distributed around the first runner perforation (19) of the upper mold (11). The first inner locking rings (3) are respectively embedded in the bottom of the upper mold (11) and used for locking and cooperating with multiple said first inner steel ball locking columns (34) one by one; The first inner air inlet pipe (32) is arranged in the lower mold (14) and communicated with the air inlets of multiple said first inner steel ball locking columns (34) respectively; The first inner air outlet pipe (33) is arranged in the lower mold (14) and communicated with the air outlets of multiple said first inner steel ball locking columns (34) respectively; The air inlet of the first air passage control valve (13) is also communicated with the first inner air inlet pipe (32), and the air outlet is communicated with the first inner air outlet pipe (33).

Images