CN117300068A - Metal casting mould - Google Patents

Abstract

The invention relates to the technical field of metal casting, and specifically relates to a metal casting mold, which includes: an inner mold composed of a plurality of acute-angle sub-molds and a plurality of obtuse-angle sub-molds staggered and arranged to form a cylindrical structure; in the center of the cylindrical structure, there is a Through hole; a spiral structure corresponding to the inner spiral groove on the annular part is provided on the outer periphery of the cylindrical structure; on the acute-angle sub-mold, the angles of the two side surfaces in contact with two adjacent obtuse-angle sub-molds are in the direction away from the through hole After extending and intersecting, they are set at an acute angle; on the obtuse-angle sub-mold, the angles of the two side surfaces in contact with two adjacent acute-angle sub-molds are set at an obtuse angle after they extend and intersect in the direction away from the through holes; this application is not only installed in the inner mold When this happens, it can be ensured that the acute-angle sub-mold and the obtuse-angle sub-mold are pressed against each other; moreover, when demoulding, the acute-angle sub-mold is first released, and then the obtuse-angle sub-mold is released, so that smooth demoulding can be achieved.

Description

A metal casting mold

Technical field

The invention relates to the technical field of metal casting, and in particular to a metal casting mold.

Background technique

The composite molecular pump has the characteristics of high pumping speed and high compression ratio. With the rapid development of industrial coating and semiconductor industries, the application of composite molecular pumps is becoming more and more widespread. The traction stage in the compound molecular pump is the key to achieving high compression ratio of the compound turbomolecular pump. For the cylindrical traction stage in the traction stage, a molecular pump static traction ring is generally used. There are multiple spiral grooves on the inner wall of the static traction ring of the molecular pump. If machining is used to make the static traction ring of a molecular pump, it is usually formed from bar stock through turning and milling. The processing time is long and the material is wasted. If the molecular pump static traction ring is made by casting, it will be difficult to demould due to the spiral groove structure on the inner wall.

Contents of the invention

Therefore, the technical problem to be solved by the present invention is: how to overcome the demoulding difficulty when using casting to produce a molecular pump static traction ring with an internal spiral groove.

In order to solve the above technical problems, the present invention provides a metal casting mold, which is suitable for casting annular parts with internal spiral grooves. The metal casting mold includes:

The inner mold is a cylindrical structure composed of a plurality of acute-angle sub-molds and a plurality of obtuse-angle sub-molds staggered and arranged; a through hole is provided in the center of the cylindrical structure; and a through hole is provided on the outer periphery of the cylindrical structure. A spiral structure corresponding to the internal spiral groove on the annular part to form the internal spiral groove on the annular part; on the acute-angle sub-mold, the angle of the two side surfaces in contact with two adjacent obtuse-angle sub-molds After extending and intersecting in the direction away from the through hole, they are arranged at an acute angle; on the obtuse-angle sub-mold, the angles of the two side surfaces in contact with two adjacent acute-angle sub-molds extend and intersect in the direction away from the through hole. The obtuse angle is provided; the inner mold is suitable for demolding during casting, and the acute-angle sub-mold is first moved into the through hole to facilitate demolding.

Optionally, also includes:

The lower mold has a blind hole in the center, and the bottom portion of the outer periphery of the inner mold is arranged to fit the inner wall of the blind hole.

Optionally, also includes:

The outer mold is a split structure with a cavity enclosed by multiple outer sub-molds; the shape of the inner periphery of the cavity corresponds to the shape of the annular part to form the shape of the annular part; in the lower The mold is provided with an annular boss arranged coaxially with the through hole; the inner circumference of the cavity near the bottom is arranged to fit the outer circumference of the annular boss.

Optionally, the lower mold has a disc-shaped structure.

Optionally, the outer mold is two symmetrically arranged outer sub-molds.

Optionally, the top of the inner mold is set higher than the outer mold.

Optionally, the spiral structure is provided close to the bottom end of the inner mold.

Optionally, the size of the acute-angle sub-mold is smaller than the size of the obtuse-angle sub-mold.

Optionally, the number of the acute-angle sub-molds is four, and the number of the obtuse-angle sub-molds is four.

Optionally, the annular part with an internal spiral groove is a static traction ring of a molecular pump.

The above technical solution of the present invention has the following advantages compared with the existing technology:

1. The metal casting mold provided by the present invention is suitable for the casting of annular parts with internal spiral grooves. The metal casting mold includes: an inner mold, which is composed of a plurality of acute-angle sub-molds and a plurality of obtuse-angle sub-molds arranged in a staggered manner. Cylindrical structure; a through hole is provided in the center of the cylindrical structure; a spiral structure corresponding to the internal spiral groove on the annular part is provided on the outer periphery of the cylindrical structure to form the annular part. The inner spiral groove; on the acute-angle sub-mold, the angles of the two side surfaces in contact with two adjacent obtuse-angle sub-molds are arranged at an acute angle after extending and intersecting in the direction away from the through hole; on the obtuse-angle sub-mold On the top, the angles of the two side surfaces in contact with two adjacent acute-angle sub-molds are arranged at an obtuse angle after extending and intersecting in the direction away from the through hole; the inner mold is suitable for casting and demoulding, the acute-angle sub-mold is first Move into the through hole to facilitate demoulding; this application adopts the above technical solution, which not only ensures that the acute-angle sub-mold and the obtuse-angle sub-mold are pressed against each other when the inner mold is installed; it also ensures that the spiral groove in the annular part In addition to the shape and quality, when demoulding, first remove the acute-angle sub-mold, and then remove the obtuse-angle sub-mold to achieve smooth demoulding.

2. The metal casting mold provided by the present invention also includes: a lower mold with a blind hole in the center, and the bottom end portion of the outer periphery of the inner mold is arranged to fit the inner wall of the blind hole; this application adopts the above technical solution, through the lower mold The blind hole of the mold facilitates accurate and reliable fixation of the inner mold.

3. The metal casting mold provided by the present invention also includes: an outer mold, which is a split structure with a cavity enclosed by a plurality of outer molds; the shape of the inner periphery of the cavity corresponds to the outer shape of the annular part. , to form the shape of the annular part; an annular boss arranged coaxially with the through hole is provided on the lower mold; the part of the inner circumference of the cavity close to the bottom is arranged to fit the outer circumference of the annular boss; Applying for the above technical solution will not only facilitate the demoulding of the outer mold, but also facilitate the accurate and reliable fixation of the outer mold through the annular boss of the lower mold.

4. The lower mold of the present invention has a disk-shaped structure; this application adopts the above technical solution to provide stable basic support for the entire metal casting mold.

5. The outer mold of the present invention is two symmetrically arranged outer sub-molds; this application adopts the above technical solution to realize the demoulding of the outer mold with as few parts as possible, reducing the complexity of the metal casting mold and reducing the difficulty of processing. thereby reducing costs.

6. The top of the inner mold of the present invention is set higher than the outer mold; this application adopts the above technical solution to facilitate the removal of the inner mold.

7. The spiral structure of the present invention is arranged close to the bottom end of the inner mold; this application adopts the above technical solution, which is suitable for the molten metal to flow to the bottom and form the inner spiral groove of the annular part near the bottom.

8. The size of the acute-angle sub-mold of the present invention is smaller than the size of the obtuse-angle sub-mold; this application adopts the above technical solution to move the acute-angle sub-mold conveniently and easily to smoothly demould and reduce labor intensity.

9. The annular part with an internal spiral groove according to the present invention is a molecular pump static traction ring; this application adopts the above technical solution to cast a qualified molecular pump static traction ring and demould smoothly.

Description of drawings

In order to more clearly explain the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings that need to be used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description The drawings illustrate some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting any creative effort.

Figure 1 is a schematic cross-sectional structural view of a metal casting mold provided in an embodiment of the present invention;

Figure 2 is a schematic top structural view of the inner mold provided in the embodiment of the present invention;

Figure 3 is a schematic three-dimensional structural diagram of the inner mold provided in the embodiment of the present invention.

Explanation of reference symbols:

1. Inner mold; 2. External mold; 3. Lower mold; 4. Acute-angle sub-mold; 5. Obtuse-angle sub-mold; 6. Spiral structure; 7. Cylindrical structure; 8. Through hole; 9. Blind hole; 10. Outer mold; 11. Annular boss.

Detailed ways

The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as limitations of the invention. Furthermore, the terms “first”, “second” and “third” are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise clearly stated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. Connection, or integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

A specific implementation of the metal casting mold shown in Figures 1 to 3 includes: an inner mold 1, a lower mold 3 and an outer mold 2. The metal casting mold described in this application is suitable for casting annular parts with internal spiral grooves; specifically, the annular parts with internal spiral grooves can be static traction rings of molecular pumps.

As shown in Figures 2 and 3, the inner mold 1 is composed of a plurality of acute-angle sub-molds 4 and a plurality of obtuse-angle sub-molds 5 that are staggered and arranged to form a cylindrical structure 7; specifically, the acute-angle sub-mold 4 The number of the obtuse-angle sub-molds 5 is four. A through hole 8 is provided in the center of the cylindrical structure 7; a spiral structure 6 corresponding to the internal spiral groove on the annular part is provided on the outer periphery of the cylindrical structure 7 to form the annular part. The inner spiral groove; on the acute-angle sub-mold 4, the angles of the two side surfaces in contact with the two adjacent obtuse-angle sub-molds 5 extend and intersect in the direction away from the through hole 8, and are arranged at an acute angle; at the obtuse angle On the mold 5, the angles of the two side surfaces in contact with two adjacent acute-angled molds 4 extend and intersect in a direction away from the through hole 8, and then form an obtuse angle. The inner mold 1 is suitable for the acute-angle sub-mold 4 to be first moved into the through hole 8 and released during casting demoulding to facilitate demoulding. Furthermore, the size of the acute-angle sub-mold 4 is smaller than the size of the obtuse-angle sub-mold 5 .

As shown in Figures 1 and 3, a blind hole 9 is provided in the center of the lower mold 3. Specifically, the lower mold 3 can be a disk-shaped structure. The bottom end portion of the outer periphery of the inner mold 1 is arranged to fit the inner wall of the blind hole 9 . The outer mold 2 is a split structure with a cavity enclosed by multiple outer sub-molds 10; specifically, the outer mold 2 can be two symmetrically arranged outer sub-molds 10, forming a symmetrical mold opening structure. The shape of the inner circumference of the cavity corresponds to the outer shape of the annular part to form the outer shape of the annular part; the lower mold 3 is provided with an annular boss 11 coaxially with the through hole 8; The portion of the inner circumference of the cavity close to the bottom end is arranged in close contact with the outer circumference of the annular boss 11 . Furthermore, the top of the inner mold 1 is set higher than the outer mold 2 . The spiral structure 6 is disposed close to the bottom end of the inner mold 1 .

The main usage process of the metal casting mold described in this application is briefly described as follows:

1. First, eight pieces of acute-angle sub-molds 4 and obtuse-angle sub-molds 5 of different shapes are installed in the blind hole 9 in the center of the lower mold 3 in a staggered manner.

2. Install the two outer sub-molds 10 on the annular boss 11 of the lower mold 3.

3. After the metal casting mold is assembled, casting is carried out.

4. After the casting is formed, demoulding is carried out. First, the outer mold 2 is removed, and then the inner mold 1 is demoulded. When removing the inner mold 1, the acute-angle sub-mold 4 is first released, and then the obtuse-angle sub-mold 5 is released.

Obviously, the above-mentioned embodiments are only examples for clear explanation and are not intended to limit the implementation. For those of ordinary skill in the art, other different forms of changes or changes can be made based on the above description. An exhaustive list of all implementations is neither necessary nor possible. The obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims (10)

1. A metal casting mold suitable for casting annular parts with internal spiral grooves, characterized by including: The inner mold (1) is composed of a plurality of acute-angle sub-molds (4) and a plurality of obtuse-angle sub-molds (5) staggered and arranged to form a cylindrical structure (7); in the center of the cylindrical structure (7), There is a through hole (8); a spiral structure (6) corresponding to the internal spiral groove on the annular part is provided on the outer periphery of the cylindrical structure (7) to form the internal spiral groove on the annular part. ; On the acute-angle sub-mold (4), the angles of the two side surfaces in contact with the two adjacent obtuse-angle sub-molds (5) extend and intersect in the direction away from the through hole (8), and are set at an acute angle; On the obtuse-angle sub-mold (5), the angles of the two side surfaces in contact with the two adjacent acute-angle sub-molds (4) extend and intersect in the direction away from the through hole (8), and are set at an obtuse angle; the inner mold ( 1) When casting and demoulding, the acute-angle sub-mold (4) is first moved into the through hole (8) to facilitate demolding. 2. The metal casting mold according to claim 1, further comprising: The lower mold (3) is provided with a blind hole (9) in the center, and the bottom portion of the outer periphery of the inner mold (1) is arranged to fit the inner wall of the blind hole (9). 3. The metal casting mold according to claim 2, further comprising: The outer mold (2) is a split structure with a cavity enclosed by a plurality of outer molds (10); the shape of the inner periphery of the cavity corresponds to the outer shape of the annular part to form the annular part. Appearance; the lower mold (3) is provided with an annular boss (11) coaxially with the through hole (8); the inner circumference of the cavity near the bottom part fits the annular boss (11) peripheral settings. 4. The metal casting mold according to claim 3, characterized in that the lower mold (3) has a disk-shaped structure. 5. The metal casting mold according to claim 3, characterized in that the outer mold (2) is two symmetrically arranged outer sub-molds (10). 6. The metal casting mold according to any one of claims 3-5, characterized in that the top of the inner mold (1) is set higher than the outer mold (2). 7. The metal casting mold according to claim 6, characterized in that the spiral structure (6) is provided close to the bottom end of the inner mold (1). 8. The metal casting mold according to any one of claims 1 to 5, characterized in that the size of the acute-angle sub-mold (4) is smaller than the size of the obtuse-angle sub-mold (5). 9. The metal casting mold according to any one of claims 1 to 5, characterized in that the number of the acute-angle sub-molds (4) is four, and the number of the obtuse-angle sub-molds (5) is Four. 10. The metal casting mold according to any one of claims 1 to 5, characterized in that the annular part with an internal spiral groove is a molecular pump static traction ring.