A planetary carrier shell core preparation mold

Abstract

The utility model discloses a kind of planetary carrier shell core preparation mould, belong to foundry technology field.The preparation mould includes core box, the core box is composed of two split mould, and its upper end face is located in the middle of two split mould connecting line and is provided with sand pouring opening, and the both sides of sand pouring opening are respectively provided with one sand shooting opening;The inner side of split mould is placed with the cavity for the planetary carrier shell core forming, and the cavity is communicated sand shooting opening by the sand shooting channel being set on the inner side of split mould.The utility model can prepare the shell core for the planetary carrier casting, compared with traditional solid core sand core, production cost and production efficiency have been obviously improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to foundry technology field, more specifically, relate to a kind of planetary carrier shell core preparation mould. BACKGROUND

[0002] With the rapid development of science and technology and manufacturing, the demand for castings is also increasing. Especially in the fields of automobiles, aerospace, engineering machinery, oil and gas resources, the demand for high-quality and high-precision castings is particularly strong. In addition, with the rise of emerging markets such as new energy vehicles and smart devices, the foundry industry has also brought new growth points. At the same time, the foundry industry also faces many challenges in the development process.

[0003] Planetary carrier is a common transmission device, widely used in the gearbox of automobile. Due to its complex internal structure, sand core is usually needed when casting blank, and sand core is used to generate the inner cavity of planetary carrier.

[0004] For example, Chinese patent application No. CN202310411154.9, published on July 28, 2023, discloses a planetary carrier casting system structure and casting method. The planetary carrier casting system includes: planetary carrier casting mold, riser and sprue. The planetary carrier casting mold includes a main body structure and an annular plate with a central hole. The main body structure includes a cone, a circular table and a plurality of columns connected in order from top to bottom. The riser includes: a clear riser and a dark riser. The clear riser is arranged on the upper end of the cone, and the dark riser is corresponding to the column and connected to the connecting end face of the column and the annular plate. The sprue has a first port and a second port at its upper end. The first port is connected to the plurality of dark risers respectively, and the second port is connected to the clear riser. It also includes: a first sand core and a second sand core. The first sand core is adapted in the cavity defined by the plurality of columns, and the second sand core is adapted in the central hole of the annular plate. The connecting end face between the column and the annular plate is a parting surface.

[0005] For example, Chinese patent application No. CN202311282899.6, published on January 16, 2024, discloses a vertical line planetary carrier sand casting process, belonging to the technical field of sand casting. The vertical line planetary carrier sand casting process of the present application comprises the following steps: S1, molding and sand preparation; S2, placing the mold in the sand box, then filling the sand to full box to form the casting mold; S3, setting the sprue, riser and water inlet, and closing the box; S4, heating the sand box; S5, pouring molten iron into the sand mold, and after the casting is formed, carrying out sand dropping and shot blasting treatment; S6, inspection and storage.

[0006] Both of the above two schemes are casting processes for generating a planetary carrier by a sand core, however, a traditional sand core generally adopts a solid core. The solid core has problems of relatively large weight, relatively high cost and relatively long production time, therefore, in order to improve the manufacturing level of an enterprise and strengthen the market competitiveness of the enterprise, a shell core emerges as the times require. The shell core is a hollow sand core which can be quickly hardened to form a shell layer of a certain thickness after the core sand contacts with a core box, and the unhardened core sand can be poured out from the core box. The shell core is rarely used in the existing casting process of a planetary carrier, and therefore a relatively perfect mold and process for preparing the shell core of the planetary carrier are also lacking. Practical new type content

[0007] 1. Problem to be solved

[0008] In view of the problem that a mold and a process for preparing a shell core for casting a planetary carrier are lacking in the current casting process of the planetary carrier, the utility model provides a mold for preparing a shell core of a planetary carrier, which can prepare a shell core for casting a planetary carrier, and compared with a traditional solid core sand core, the production cost and the production efficiency are obviously improved.

[0009] 2. Technical scheme

[0010] In order to solve the above problem, the utility model adopts the following technical scheme.

[0011] A mold for preparing a shell core of a planetary carrier, comprising a core box, the core box is composed of two split molds, a sand pouring opening is arranged on the middle part of the connecting line of the two split molds at the upper end face, and a sand shooting opening is arranged on each side of the sand pouring opening; a cavity for forming the shell core of the planetary carrier is arranged on the inner side of the split mold, and the cavity is communicated with the sand shooting opening through a sand shooting channel arranged on the inner side of the split mold.

[0012] As a further improvement of the technical scheme, a positioning pin hole for mold closing is arranged on the inner side of the split mold.

[0013] As a further improvement of the technical scheme, an exhaust hole is arranged on the inner side of the split mold.

[0014] As a further improvement of the technical scheme, a heating through hole extending along the length direction of the core box is arranged on the core box, and a heating pipe is arranged in the heating through hole.

[0015] As a further improvement of the technical scheme, the upper end face of the core box is connected with a sand shooting plate, and a sand shooting hole is arranged on the sand shooting plate at a position corresponding to the sand shooting opening.

[0016] As a further improvement of the technical scheme, a guide hole extending to the inside of the core box along the width direction of the core box is arranged on the core box, a cover plate is arranged on the side face of the core box, and a jack rod extending into the guide hole is arranged on the cover plate.

[0017] As a further improvement of the technical scheme, the number of the ejector rods is multiple, and the ejector rods are distributed on the cover plate at intervals.

[0018] As a further improvement of the technical scheme, four corners of the core box are fixedly provided with mold pins matched with the core shooter mounting structure.

[0019] As a further improvement of the technical scheme, a sealing plate is fixedly arranged between a pair of mold pins on two sides of the cover plate, and the sealing plate is fixedly connected with the cover plate.

[0020] A preparation process of a planet carrier shell core comprises the following steps: after the core box is mounted on a core shooter, the core box is heated to 220-260 DEG C first, then the core box is turned over and vibrated to pour out the un-solidified inner layer sand after the outer layer sand is solidified and the inner layer sand is not solidified for 8-12 s, and finally the shell core is completed after solidification for 75-85 s.

[0021] 3, beneficial effects

[0022] Compared with the prior art, the planet carrier shell core preparation mold has the beneficial effects that:

[0023] (1) The planet carrier shell core preparation mold has the following beneficial effects: when the sand shooting hole shoots sand into the cavity, the outer layer sand in the cavity is solidified first, and then the inner layer sand is solidified, the core box is turned over and vibrated to pour out the inner layer sand after the outer layer sand is solidified and the inner layer sand is not solidified, and then the hollow planet carrier shell core is prepared after solidification for a period of time, compared with the traditional solid core sand core, the weight of a single shell core is reduced by 38%, the staff can take the shell core more conveniently, the precoated sand raw material is saved, the cost is greatly reduced, the production time of a single shell core is greatly reduced compared with the solid core, and the production efficiency of the sand core is improved.

[0024] (2) The planet carrier shell core preparation mold has the following beneficial effects: the positioning pin hole makes the mold closing of the two mold halves more convenient and accurate, and the exhaust hole can exhaust the gas in the cavity during the preparation of the shell core, so that the quality of the shell core is ensured.

[0025] (3) The planet carrier shell core preparation mold has the following beneficial effects: the ejector rod is arranged on the core box in the length direction, so that the shell core can be ejected after the preparation of the shell core is completed, and the shell core is smoothly separated.

[0026] (4) The planet carrier shell core preparation mold has the following beneficial effects: the sand shooting plate and the mold pin are arranged, so that the core box can be quickly and conveniently connected with the core shooter, and the production efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1The whole structure schematic diagram of the planet carrier shell core preparation mold of the utility model is shown in the figure.

[0028] Figure 2 The internal structure schematic diagram of the planet carrier shell core preparation mold of the utility model when not containing a cavity is shown in the figure.

[0029] Figure 3 The cavity structure schematic diagram of the planet carrier shell core preparation mold of the utility model is shown in the figure.

[0030] In the figure: 1, core box; 2, sand pouring opening; 3, sand shooting opening; 4, cavity; 5, sand shooting channel; 6, positioning pin hole; 7, heating through hole; 8, sand shooting plate; 9, cover plate; 10, ejector rod; 11, exhaust hole; 12, mold foot; 13, sealing plate. DETAILED DESCRIPTION

[0031] The exemplary embodiments of the utility model are described in detail below. Although these exemplary embodiments are described in sufficient detail to enable those skilled in the art to practice the utility model, it should be understood that other embodiments can be realized and various changes can be made to the utility model without departing from the spirit and scope of the utility model. The more detailed description of the embodiments of the utility model below is not used to limit the scope of the claimed utility model, but only for illustration and does not limit the description of the features and characteristics of the utility model, to propose the best way to implement the utility model, and enough to enable those skilled in the art to implement the utility model. Therefore, the scope of the utility model is only limited by the attached claims.

[0032] Embodiment 1

[0033] A planet carrier shell core preparation mold for preparing a shell core for casting a planet carrier, the specific structure and technical effects thereof are described in detail below.

[0034] As Figure 1 and Figure 2 shown, the preparation mold comprises a core box 1, the core box 1 is composed of two split molds, a sand pouring opening 2 is arranged on the upper end face of the two split molds at the middle of the connecting line of the two split molds, and a sand shooting opening 3 is arranged on each side of the sand pouring opening 2. A cavity 4 for forming a planet carrier shell core is arranged on the inner side face of the split mold, the sand pouring opening 2 is a part of the top of the cavity 4 and is exposed on the upper end face of the core box 1, and the cavity 4 is communicated with the sand shooting opening 3 through a sand shooting channel 5 arranged on the inner side face of the split mold.

[0035] On the inner side of the split mold, a positioning pin hole 6 for clamping is provided, so that the two split molds can be conveniently and accurately clamped by the positioning pin. At the same time, an exhaust hole 11 is also provided on the inner side of the split mold, which can exhaust the gas in the cavity during the preparation of the shell core, ensuring the quality of the shell core. The core box 1 is provided with a heating through hole 7 extending along the length direction thereof, and a heating pipe is arranged in the heating through hole 7, so that the core box can be heated during the preparation of the shell core. The upper end surface of the core box 1 is connected with a sand shooting plate 8, and the sand shooting plate 8 is provided with a sand shooting hole corresponding to the sand shooting port 3.

[0036] In addition, a guide hole extending to the inside of the core box 1 in the width direction of the core box 1 is provided on the core box 1, and a cover plate 9 is arranged on the side surface of the core box 1, and a ejector rod 10 extending into the guide hole is arranged on the cover plate 9. The number of the ejector rod 10 is multiple, and the ejector rod 10 is distributed on the cover plate 9 in intervals. A mold foot 12 matched with the core shooting machine mounting structure is fixedly installed at the four corner portions of the core box 1, and a sealing plate 13 is fixedly installed between a pair of mold feet 12 on the two sides of the cover plate 9, and the sealing plate 13 is fixedly connected with the cover plate 9. By arranging the sand shooting plate 8 and the mold foot 12, the core box can be quickly and conveniently connected with the core shooting machine, and the production efficiency is improved. The ejector rod 10 can eject the shell core after the preparation of the shell core is completed, so that the shell core is smoothly separated.

[0037] During the preparation of the shell core, the core box 1 is first installed on the core shooting machine. Then, the heating pipe is heated to 220-260 DEG C, the coated sand is shot from the sand shooting plate 8 to the inside of the cavity 4 through the sand shooting channel 5, and the gas in the cavity 4 is exhausted through the exhaust channel 11. When the outer layer sand is solidified and the inner layer sand is not solidified, the un-solidified inner layer sand is poured out by overturning and vibrating for 8-12 s, and finally solidified for 75-85 s, so that the preparation of the shell core is completed.

[0038] In summary, the shell core preparation mold and the preparation process of the planetary carrier according to the embodiment can set the sand pouring port in the middle of the connecting line of the two split molds, so that when the sand is shot into the cavity through the sand shooting port, the outer layer sand in the cavity is first solidified, and then the inner layer sand is solidified. When the outer layer sand is solidified and the inner layer sand is not solidified, the core box is overturned and vibrated to pour out the inner layer sand, and then solidified for a period of time, so that the hollow planetary carrier shell core for casting is prepared. Compared with the traditional solid sand core, the weight of a single shell core is reduced by 38%, the staff can take it more conveniently, the coated sand raw material is saved, the cost is greatly reduced, and the production time of a single shell core is greatly reduced compared with the solid core, so that the production efficiency of the sand core is improved.

[0039] The examples of the utility model only describe the preferred embodiments of the utility model, and do not limit the utility model concept and scope, and various deformations and improvements of the technical scheme of the utility model made by the engineering and technical personnel in the art shall fall into the protection scope of the utility model.

Claims

1. A mold for preparing a planetary carrier core, characterized in that: The core box (1) consists of two molds. A sand pouring port (2) is provided on the upper end face of the core box (1) at the middle of the connection line between the two molds. A sand injection port (3) is provided on each side of the sand pouring port (2). A cavity (4) for forming the planetary carrier shell core is placed on the inner side of the mold. The cavity (4) is connected to the sand injection port (3) through a sand injection channel (5) provided on the inner side of the mold.

2. The planetary carrier core preparation mold according to claim 1, characterized in that: The inner side of the mold parting surface is provided with a positioning pin hole (6) for mold closing.

3. The planetary carrier core preparation mold according to claim 1, characterized in that: The inner side of the mold is provided with an exhaust hole (11).

4. The planetary carrier core preparation mold according to claim 1, characterized in that: The core box (1) has a heating through hole (7) extending along its length, and a heating tube is placed inside the heating through hole (7).

5. The planetary carrier core preparation mold according to claim 1, characterized in that: The upper end face of the core box (1) is connected to the sand-shooting plate (8), and the sand-shooting plate (8) has a sand-shooting hole at the position corresponding to the sand-shooting port (3).

6. The planetary carrier core preparation mold according to claim 1, characterized in that: The core box (1) has a guide hole extending into the interior of the core box (1) along its width direction. The side of the core box (1) is provided with a cover plate (9), and a top rod (10) extending into the guide hole is mounted on the cover plate (9).

7. The planetary carrier core preparation mold according to claim 6, characterized in that: The number of top rods (10) is multiple, and they are spaced apart on the cover plate (9).

8. The planetary carrier core preparation mold according to claim 7, characterized in that: The core box (1) is fixedly installed with mold feet (12) that match the mounting structure of the core shooter at its four corners.

9. A planetary carrier core preparation mold according to claim 8, characterized in that: A sealing plate (13) is fixedly installed between a pair of mold feet (12) on both sides of the cover plate (9), and the sealing plate (13) is fixedly connected to the cover plate (9).

Images