CN220943089U - Sand mould for thin-wall disc castings - Google Patents

Abstract

The application discloses a sand mould for thin-wall disc castings, and belongs to the field of casting equipment. Specifically, the sand mold includes: the molding panel is used for dividing the sand mold into an upper sand mold and a lower sand mold by taking the cross section of the molding panel along the first direction as a parting surface; the upper sand mold and the lower sand mold jointly form a cavity for pouring a thin-wall disc casting; the top of the forming panel is provided with a plurality of rails, the rails form a plurality of risers on the top wall of the cavity, the risers are communicated with the inside of the cavity, and the risers are used for feeding castings to be formed in the cavity. According to the application, through adding a plurality of rails and matching designs of the sprue, the cross gate and the inner gate, the sand mould made of the sand mould can be poured into a casting with higher precision and better quality.

Description

Sand mould for thin-wall disc castings

Technical Field

The present disclosure relates generally to the field of casting mold apparatus, and more particularly to a sand mold for thin-walled disc castings.

Background

Sand casting is a casting method for producing castings in sand molds. Steel, iron and most nonferrous alloy castings are obtained by sand casting methods. Because the molding materials used for sand casting are cheap and easy to obtain, the casting mold is simple and convenient to manufacture, and is suitable for single-piece production, batch production and mass production of castings, and is a basic process in casting production for a long time.

The existing thin disc castings are extremely strict in terms of the characteristics of various patterns of shapes, the wall thickness of the radial plate is generally 8-12mm, and the central hub is a local thick and large part, and the delivery standard of the thin disc castings requires UT (Ultrasonic Testing, ultrasonic detection) flaw detection, and the thin disc castings are cast by adopting a sand casting device. Because the casting process has higher difficulty, shrinkage porosity defects still exist in the flaw detection part, the yield is still less than 50%, and the process is quite unstable. Against this background we propose a sand mould for thin-walled disc castings to solve the above problems.

Disclosure of utility model

In view of the above-described drawbacks or shortcomings of the prior art, it is desirable to provide a sand mold for thin-walled disc castings that has high casting accuracy and improved yield.

In a first aspect, the present application provides a sand mould for thin-walled disc castings, comprising:

The panel is formed by a molding process,

Dividing the sand mould into an upper sand mould and a lower sand mould by taking the cross section of the forming panel along the first direction as a parting surface; the upper sand mould and the lower sand mould jointly form a cavity for pouring the thin-wall disc castings, and the cavity is formed by jointly matching the sand mould with casting sand;

The top of the forming panel is provided with a plurality of rails, the rails form a plurality of risers on the top wall of the cavity, the risers are communicated with the inside of the cavity, and the risers are used for feeding castings to be formed in the cavity.

According to the technical scheme provided by the embodiment of the application, the upper sand mold comprises: a first boss and a second boss; the first protruding part and the second protruding part respectively form different pouring channels of the cavity;

the lower sand mold comprises: and a third protruding part corresponding to the second protruding part.

According to the technical scheme provided by the embodiment of the application, the first protruding part consists of two arc-shaped bending sections; the first protruding part is used for forming a runner of the cavity;

The openings of the two arc-shaped bending sections are oppositely arranged and are uniformly distributed on two sides of the forming panel; two of the arc-shaped curved sections are provided with adjacent ends extending away from the forming panel.

According to the technical scheme provided by the embodiment of the application, the second protruding part is positioned between the two extending sections, and the second protruding part is provided with a first protruding part

The part extends to the direction of keeping away from the shaping panel, is used for forming the sprue of die cavity, the sprue with the cross runner is in the die cavity intercommunication setting.

According to the technical scheme provided by the embodiment of the application, a plurality of fourth protruding parts are arranged between the arc-shaped bending section and the forming panel, the fourth protruding parts are used for forming the inner pouring gate of the cavity, and the inner pouring gate and the transverse pouring gate are communicated in the cavity.

According to the technical scheme provided by the embodiment of the application, two ends of the third protruding part are respectively connected with the two arc-shaped bending sections and are used for being matched with the second protruding part to form the sprue communicated with the runner; and a filter screen is arranged at the sprue and used for filtering foreign matters in molten iron injected into the cavity.

According to the technical scheme provided by the embodiment of the application, the side, away from the rail, of the forming panel is provided with textures matched with the casting to be formed.

According to the technical scheme provided by the embodiment of the application, the middle part of the forming panel is provided with the opening, and the plurality of the rails are distributed at intervals along the circumferential direction of the opening.

In summary, the technical scheme specifically discloses a sand mold for thin-wall disc castings, which is characterized in that a molding panel is used for dividing the sand mold into an upper sand mold molding panel and a lower sand mold molding panel by taking the cross section of the molding panel along a first direction as a parting surface molding panel; the upper sand mould forming panel and the lower sand mould forming panel jointly form a cavity for pouring thin-wall disc castings; the top of the forming panel is provided with a plurality of rail forming panels, the rail forming panels form a plurality of risers of the top wall of the cavity, the risers are communicated with the inside of the cavity, and the risers are used for feeding castings to be formed in the cavity.

Aiming at the problem that the existing thin-wall disc castings have low yield under strict UT flaw detection requirements, the application enables a plurality of risers to be formed at the top of a cavity when corresponding cavities are formed through a plurality of rails on the forming panel of the sand mould, and the risers can timely supplement molten iron into the castings to be formed when molten iron is injected into the cavities to cast the castings to be formed, thereby preventing the damage of bubbles and the like in the castings caused by insufficient molten iron from influencing the UT flaw detection result of the castings.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the accompanying drawings in which:

FIG. 1 is a schematic view of the overall structure (including parting surfaces) of a sand mold for thin-walled disc castings.

Fig. 2 is a schematic view of the overall structure of a sand mold (without parting surfaces) for thin-walled disc castings.

Fig. 3 is a schematic diagram of the upper sand mold of a sand mold for thin-wall disc castings.

Fig. 4 is a schematic view showing the structure of a lower sand mold of a sand mold for thin-wall disc castings.

Fig. 5 is an elevation view of a sand mold for a thin-walled disc-type casting.

Reference numerals in the drawings: 100. forming a panel; 101. a parting surface; 200. loading a sand mold; 201. a first boss; 202. a second protruding portion; 2011. an arc-shaped curved section; 2012. an extension section; 203. a third boss; 204. a fourth protruding portion; 300. a sand mold is arranged; 400. and (5) a false head.

Detailed Description

The application is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be noted that, for convenience of description, only the portions related to the application are shown in the drawings.

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.

Example 1

Sand casting is a casting method for producing castings in sand molds. Because the molding materials used for sand casting are cheap and easy to obtain, the casting mold is simple and convenient to manufacture, and is suitable for single-piece production, batch production and mass production of castings, and is a basic process in casting production for a long time.

The basic raw materials for manufacturing sand molds are foundry sand and sand binders. If the high temperature performance of the silica sand can not meet the use requirement, special sand such as zircon sand, chromite sand, corundum sand and the like is used. In order to make the manufactured sand mould and core have certain strength, the mould is not deformed or damaged when being carried, combined and poured with liquid metal, a sand binder is generally added in casting to bind loose sand grains into sand, and the sand mould disclosed by the implementation needs to be matched with the casting sand and the sand binder for use.

Referring to fig. 1 and 2, an overall structure schematic diagram of a sand mold for a thin-wall disc casting according to the present embodiment is provided, including:

Forming the panel 100, wherein the forming panel 100 is designed according to the specification and the style of castings;

For example, as shown in fig. 4, a texture matched with the casting to be formed is arranged on one side of the forming panel 100 away from the rail 400, and the texture is a plurality of strip-shaped protrusions; in addition, the middle of the molding panel 100 has an opening;

As shown in fig. 5, the sand mold is divided into an upper sand mold 200 and a lower sand mold 300 with a cross section of the molding panel 100 in a first direction as a parting plane 101; the upper sand mold 200 and the lower sand mold 300 together form a cavity for pouring thin-wall disc castings; here, the first direction is a horizontal direction; the cavity is a sand mold cavity obtained by jointly matching the sand mold with casting sand, specifically, after the sand mold is coated by the casting sand, the sand mold is obtained after the sand mold is coated.

A plurality of rails 400 are arranged at the top of the molding panel 100, and the rails 400 are distributed at intervals along the circumferential direction of the opening; the rails 400 form a plurality of risers on the top wall of the cavity, the risers are communicated with the inside of the cavity, and the risers are used for feeding castings to be formed in the cavity.

Wherein, definition of feeding: shrinkage is generated in the process of converting liquid into solid, and if the liquid is not timely replenished, shrinkage holes are generated in the casting, so that the casting is scrapped. Therefore, the liquid is added to the casting before the casting solidifies to prevent shrinkage cavity, and the part of the casting added with the liquid is called feeding; the rail 400 is arranged at the part of the casting, which is thick and large, so that feeding operation can be timely performed on the casting to be formed, the rail 400 can be properly adjusted according to the technological parameters, the shape and the like of the casting, the rail 400 is arranged at the place where shrinkage cavity is easy to occur, and the processing precision of the sand mold can be improved.

And the definition with respect to the parting plane 101 is: when the sand mould is matched with casting sand to prepare a sand mould with a corresponding cavity, the sand mould is required to be opened to take out a corresponding casting, and the plane for opening the sand mould can be defined as a parting plane 101, and the parting plane 101 can be a virtual concept plane for the sand mould and can also be a true plate surface.

The upper sand mold 200 includes: a first boss 201 and a second boss 202; the first protruding part 201 and the second protruding part 202 respectively form different pouring channels;

The lower sand mold 300 includes: and a third protrusion 203 provided corresponding to the second protrusion 202.

Specifically, after the sand mold is made by matching with casting sand, the different protruding parts are the concave parts corresponding to the casting sand, and after the sand mold is taken out, pouring channels into which molten iron (raw materials for casting castings) flows are respectively formed in the plurality of concave parts and are used for injecting the molten iron into the cavity.

As shown in fig. 3, the first protruding portion 201 extends away from the forming panel 100, and the first protruding portion 201 is formed by two arc-shaped curved sections 2011; the first protruding part 201 is used for forming a runner of the cavity;

The openings of the two arc-shaped curved sections 2011 are oppositely arranged and uniformly distributed on two sides of the forming panel 100; two of the arcuate curved segments 2011 are each provided with 2012 at adjacent one end extending away from the contoured panel 100.

The second protruding portion 202 is located between the two extending sections 2012, and the second protruding portion 202 extends away from the forming panel 100, so as to form a sprue of the cavity, and the sprue and the runner are disposed in communication in the cavity.

In addition, two ends of the third protrusion 203 matched with the second protrusion 202 are respectively connected with two arc-shaped bending sections 2011, so as to be matched with the second protrusion 202 to form the sprue communicated with the runner; and a filter screen is arranged at the sprue and used for filtering foreign matters in molten iron injected into the cavity.

In the practical application process, the second protruding portion 202 and the third protruding portion 203 form a sprue in the cavity together, the sprue is also a main runner for injecting molten iron, the molten iron flows into the runner sequentially from the sprue, and enters the cavity formed by the molding panel 100, and the sprue is arranged vertically to the runner in the application, so that the inflow of the molten iron can be accelerated.

The arc bending section 2011 with be provided with a plurality of fourth archs 204 between the shaping panel 100 still, the fourth arch 204 is used for forming the ingate of die cavity, the ingate with the ingate is in the intercommunication sets up in the die cavity, and the ingate is the connecting portion of ingate and shaping panel 100, and it encircles shaping panel 100 and is provided with a plurality ofly, it is difficult to understand that shaping panel 100 also can form the die cavity in the casting sand after cooperation with the casting sand that die cavity, then the ingate encircles shaping panel 100 and is provided with a plurality ofly also can accelerate the rapid prototyping of waiting to shape foundry goods and makes waiting to shape foundry goods also can the shaping more even.

In summary, with reference to the contents shown in fig. 1 and 2, the specific working principle of the present application is as follows:

The sand mould is matched with casting sand, and a cavity matched with the mould is formed in the casting sand; wherein the first boss 201, the second boss 202, the third boss 203 and the fourth boss 204 respectively form pouring channels in the cavity, and the cavity formed by the molding surface 100 in the casting sand is the forming position of the casting core; the second protruding part 202 and the third protruding part 203 together form a sprue, and the casting molten iron can enter the sprue formed by the first protruding part 201 from the sprue, finally enter the cavity formed by the molding panel 100 in the casting sand through the sprue and the inner sprue formed by the fourth protruding part 204, and the casting molding of the casting is completed. Meanwhile, in the casting process, as the plurality of the rails 400 form a plurality of risers on the top wall of the cavity, the risers can timely fill the molten iron in the cavity, so that the sufficiency of the molten iron is ensured. And after the casting is finished, taking out the molded casting, and cutting and polishing the redundant part formed by redundant molten iron at the inner pouring gate and the riser of the molded casting.

The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the application referred to in the present application is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.

Claims (8)

1. A sand mold for thin-walled disc castings, comprising:

A molding panel (100),

Dividing the sand mold into an upper sand mold (200) and a lower sand mold (300) by taking the cross section of the molding panel (100) along the first direction as a parting surface (101); the upper sand mould (200) and the lower sand mould (300) jointly form a cavity for pouring a thin-wall disc casting, and the cavity is formed by jointly matching the sand mould with casting sand;

The top of the molding panel (100) is provided with a plurality of rails (400), the rails (400) form a plurality of risers on the top wall of the cavity, the risers are communicated with the inside of the cavity, and the risers are used for feeding castings to be molded in the cavity.

2. A sand mold for thin-walled disc castings according to claim 1, wherein,

The upper sand mold (200) comprises: a first boss (201) and a second boss (202); the first protruding part (201) and the second protruding part (202) respectively form different pouring channels of the cavity;

The lower sand mold (300) includes: and a third boss (203) provided in correspondence with the second boss (202).

3. A sand mold for thin-walled disc castings according to claim 2, wherein,

The first protruding part (201) consists of two arc-shaped bending sections (2011); the first protruding part (201) is used for forming a cross runner of the cavity;

The openings of the two arc-shaped bending sections (2011) are oppositely arranged and uniformly distributed on two sides of the forming panel (100); two of the arcuate curved sections (2011) are each provided with an adjacent end (2012) extending away from the profiled panel (100).

4. A sand mold for thin-walled disc castings according to claim 3, wherein,

The second protruding part (202) is located between the two extending sections (2012), the second protruding part (202) extends to the direction away from the forming panel (100) and is used for forming a sprue of the cavity, and the sprue and the runner are communicated in the cavity.

5. A sand mold for thin-walled disc castings according to claim 4, wherein,

A plurality of fourth protruding portions (204) are further arranged between the arc-shaped bending section (2011) and the forming panel (100), the fourth protruding portions (204) are used for forming an inner runner of the cavity, and the inner runner and the cross runner are communicated in the cavity.

6. A sand mold for thin-walled disc castings according to claim 5, wherein,

Two ends of the third protruding part (203) are respectively connected with two arc-shaped bending sections (2011) and are used for being matched with the second protruding part (202) to form the sprue communicated with the runner; and a filter screen is arranged at the sprue and used for filtering foreign matters in molten iron injected into the cavity.

7. A sand mold for thin-walled disc castings according to claim 1, wherein,

And the side of the molding panel (100) away from the rail (400) is provided with textures matched with the casting to be molded.

8. A sand mold for thin-walled disc castings according to claim 7, wherein,

The middle part of the forming panel (100) is provided with an opening, and a plurality of the rails (400) are circumferentially distributed at intervals along the opening.