Evanescent mode mold for casting power takeoff shell with embedded oil duct

Abstract

The utility model relates to an evanescent mode mold for casting a power takeoff shell with an embedded oil duct, and effectively solves the problems that sand filling molding is difficult to carry out on the oil duct part of the shell in a traditional sand mold casting mode, the accurate oil duct part is inconvenient to simulate, and deviation is easy to generate. According to the evanescent mode mold for casting the power takeoff shell containing the embedded oil duct, through the arrangement of the bottom mold, the top mold, the power takeoff shell evanescent mode and the oil duct pipeline, the oil duct pipeline can be directly placed at the corresponding parts in the bottom mold and the top mold in advance; the oil duct pipeline is directly embedded in the power takeoff shell evanescent mode, it can be guaranteed that the fixing position of the oil duct pipeline is accurate, the power takeoff shell and the oil duct pipeline can be integrally cast and formed through the power takeoff shell evanescent mode subsequently, and therefore the problem of oil duct sand filling in the traditional sand mold casting process is effectively solved; and the casting mode of the power takeoff shell is simpler and more convenient, and the power takeoff shell can be more conveniently cast.

Description

Technical Field

[0001] This utility model belongs to the technical field of power take-off housing casting molds, specifically relating to a lost foam mold for casting power take-off housings containing embedded oil channels. Background Technology

[0002] A power take-off (PTO) is one or more sets of transmission gears, also known as a power output device. It is generally composed of a gearbox, clutch, and controller, and is connected to the low-gear or auxiliary gearbox output shaft to output power to external working devices, such as lifting pumps.

[0003] The oil passages of the power take-off (PTO) housing are long and narrow. Currently, when casting the PTO housing, a separate casting method is often used. The PTO housing is first cast using the traditional sand casting method. However, it is difficult to fill the oil passage area of ​​the housing with sand using the traditional sand casting method. It is not easy to simulate the accurate oil passage location, which can easily lead to deviations. It is difficult to produce a high-quality PTO housing, making it inconvenient to use in the production of PTO housings. Utility Model Content

[0004] To address the above issues and overcome the shortcomings of existing technologies, this utility model provides a lost foam casting mold for power take-off (PTO) housings containing embedded oil channels. This lost foam casting mold for PTO housings allows the oil channels to be directly embedded within the lost foam of the PTO housing and ensures the precise positioning of the oil channels. This facilitates the subsequent integral casting of the PTO housing and oil channels using the lost foam of the PTO housing, effectively solving the problem of sand filling in the oil channels during traditional sand casting. This makes the casting method of the PTO housing simpler and easier to use when casting PTO housings.

[0005] A lost foam casting mold for a power take-off (PTO) housing containing embedded oil channels includes a bottom mold, a top mold fixedly mounted on the upper surface of the bottom mold and forming a cavity between them, a lost foam casting mold for a PTO housing with the same shape as the PTO housing is fitted inside the cavity between the bottom mold and the top mold, and an oil channel pipeline is embedded in the oil channel portion inside the lost foam casting mold for the PTO housing, the oil channel pipeline being integrally formed with the lost foam casting mold for the PTO housing.

[0006] Preferably, the bottom mold has feeding holes on both sides for filling lost foam material into it, and the feeding holes are connected to the cavities between the bottom mold and the top mold.

[0007] Preferably, the internal structure of the bottom mold and the top mold is adapted to the overall structure of the lost foam of the power take-off housing.

[0008] Preferably, the power take-off housing is tightly fitted inside the bottom mold and the top mold in the lost foam casting process and can be removed separately.

[0009] Preferably, the oil passage is installed inside the bottom mold and the top mold and is accurately installed in the oil passage part of the lost foam of the power take-off housing.

[0010] The beneficial effects of the above technical solution are as follows:

[0011] This lost foam casting mold for power take-off (PTO) housings, which includes an embedded oil channel, allows for the pre-placement of the oil channel within corresponding positions in the bottom and top molds. The mold then casts a lost foam model of the PTO housing with the same shape as the PTO housing itself. This ensures the oil channel is precisely embedded within the lost foam model, facilitating the subsequent integral casting of the PTO housing and oil channel using the lost foam model. This effectively solves the problem of sand filling in the oil channels during traditional sand casting, making the casting process for PTO housings simpler and more convenient. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0013] Figure 2 This is a schematic diagram showing the installation status of the lost foam casting of the power take-off housing and the oil pipeline of this utility model;

[0014] Figure 3 This is a schematic diagram of a novel oil pipeline system.

[0015] In the diagram: 1. Bottom mold; 2. Top mold; 3. Lost foam casting of power take-off housing; 4. Oil passage; 5. Feed hole. Detailed Implementation

[0016] The foregoing and other technical contents, features and effects of this utility model are described in conjunction with the appendix below. Figures 1 to 3 The embodiments are described in detail below.

[0017] This embodiment provides a lost foam casting mold for a power take-off housing containing an embedded oil channel, as shown in the attached figure. Figure 1-3 As shown, it includes a bottom mold 1, and a top mold 2 that is set together with it is fixedly installed on the upper surface of the bottom mold 1, and the two form a cavity. Both sides of the bottom mold 1 are provided with feeding holes 5 for filling lost foam material into it. The feeding holes 5 are connected to the cavity between the bottom mold 1 and the top mold 2.

[0018] The bottom mold 1 and the top mold 2 can be tightly connected to each other by bolts. The cavity between the bottom mold 1 and the top mold 2 contains a lost mold 3 of the power take-off housing with the same shape as the power take-off housing. The internal structure of the bottom mold 1 and the top mold 2 is adapted to the overall structure of the lost mold 3 of the power take-off housing. The lost mold 3 of the power take-off housing is tightly fitted inside the bottom mold 1 and the top mold 2 and can be removed separately.

[0019] When manufacturing the lost foam 3 of the power take-off housing, the special foam particles for lost foam casting (there are three types: expandable polystyrene resin beads, expandable methyl methacrylate and styrene copolymer resin beads, and expandable polymethyl methacrylate resin beads) can be pre-foamed. In this scheme, the power take-off housing often uses expandable polystyrene resin beads as the lost foam material, and the beads are expanded to a certain size by vacuum pre-foaming.

[0020] Then, the pre-foamed expandable polystyrene resin beads are placed in a dry and ventilated silo for a certain period of time so that the pressure inside and outside the bead cells can be balanced, so that the beads have elasticity and re-expansion ability, and the moisture on the surface of the beads is removed. The curing time is 8-48 hours.

[0021] The oil passage section inside the lost mold 3 of the power take-off housing is embedded with an oil passage pipe 4. The oil passage pipe 4 is integrally formed with the lost mold 3 of the power take-off housing. The oil passage pipe 4 passes through the interior of the bottom mold 1 and the top mold 2 and is accurately installed in the oil passage section of the lost mold 3 of the power take-off housing.

[0022] Finally, open the bottom mold 1 and the top mold 2. First, place the oil passage 4 in the corresponding part of the cavity between the bottom mold 1 and the top mold 2, and then fix the bottom mold 1 and the top mold 2 tightly. Then, fill the cavity between the bottom mold 1 and the top mold 2 through the feed hole 5 on the side of the bottom mold 1 with the pre-foamed and cured expandable polystyrene resin beads. Heat the beads to make them expand again, fill the gaps between the beads, and fuse the beads together to form a smooth surface. The lost mold 3 of the power take-off housing can be obtained. The oil passage 4 and the lost mold 3 of the power take-off housing form an integral structure, which effectively solves the problem of sand filling in the oil passage and makes the casting of the power take-off housing simpler.

[0023] Subsequently, the lost foam casting process is used to coat the lost foam of the power take-off housing containing the oil pipeline 4 with a special high-temperature resistant coating. After drying, it is placed in a special sand box and filled with dry sand according to the process requirements. The sand is compacted by three-dimensional vibration and molten metal is poured under vacuum. At this time, the model vaporizes and disappears, and the molten metal replaces the model, replicating the casting that is the same as the lost foam 3 of the power take-off housing. The oil pipeline 4 is also integrated with the cast power take-off housing.

[0024] In summary, the steps for using the lost foam casting mold for the power take-off housing containing embedded oil channels are as follows:

[0025] 1. Open the bottom mold 1 and the top mold 2, place the metal oil pipe 4 in the accurate position inside it, and then firmly fix the bottom mold 1 and the top mold 2 together.

[0026] 2. The processed foam beads are filled into the cavity between the bottom mold 1 and the top mold 2 through the feed hole 5 on the side of the bottom mold 1. After heating, the beads will expand again, fill the gaps between the beads, and fuse the beads together to form a smooth surface. The beads completely fill the cavity between the bottom mold 1 and the top mold 2 and wrap the oil passage 4, thereby forming the lost foam 3 of the power take-off housing with the oil passage 4 embedded in it.

[0027] 3. Cool the lost foam 3 of the power take-off housing to reduce its temperature below the softening temperature. After the lost foam 3 of the power take-off housing has hardened and solidified, remove it so that the subsequent power take-off housing casting can be carried out.

[0028] The above description is only for illustrating the present utility model. It should be understood that the present utility model is not limited to the above embodiments, and various modifications that conform to the concept of the present utility model are within the protection scope of the present utility model.

Claims

1. A lost foam casting mold for a power take-off housing containing an embedded oil channel, comprising a bottom mold (1), characterized in that: The top mold (2) is fixedly installed on the upper surface of the bottom mold (1) and forms a cavity between them. The cavity between the bottom mold (1) and the top mold (2) contains a lost mold (3) of the power take-off housing with the same shape as the power take-off housing. The oil passage part inside the lost mold (3) of the power take-off housing contains an oil passage pipe (4). The oil passage pipe (4) is integrally formed with the lost mold (3) of the power take-off housing.

2. The lost foam casting mold for a power take-off housing containing an embedded oil channel according to claim 1, characterized in that: The bottom mold (1) has feeding holes (5) on both sides for filling lost foam material into it. The feeding holes (5) are connected to the cavity between the bottom mold (1) and the top mold (2).

3. The lost foam casting mold for a power take-off housing containing an embedded oil channel according to claim 1, characterized in that: The internal structure of the bottom mold (1) and the top mold (2) is compatible with the overall structure of the lost foam (3) of the power take-off housing.

4. The lost foam casting mold for a power take-off housing containing an embedded oil channel according to claim 1, characterized in that: The power take-off housing lost foam (3) is tightly fitted inside the bottom mold (1) and the top mold (2) and can be removed separately.

5. The lost foam casting mold for a power take-off housing containing an embedded oil channel according to claim 1, characterized in that: The oil passage (4) passes through the interior of the bottom mold (1) and the top mold (2) and is accurately installed in the oil passage part of the lost foam (3) of the power take-off housing.

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