Conformal chilling block structure for complex casting

Abstract

The utility model discloses a conformal chill structure for complex castings, which comprises an outer die, an inner core, a core bar and conformal chill, the outer die comprises an upper swage die and a lower swage die, the conformal chill comprises a first chill, a second chill and a third chill, the first chill is a ring body with a stepped outer circumference, the second chill is a ring body with a stepped outer circumference, and the third chill is a ring body with a stepped outer circumference. The outer circumference shape of the first chilling block is attached to the surface of a casting, the first chilling block is welded to the core bar, the core bar penetrates through the inner core, the second chilling block and the third chilling block are each divided into an upper half part and a lower half part, the upper half parts are located on the upper swage die, the lower half parts are located on the lower swage die, and positioning strips are installed at the corresponding positions of the upper swage die and the lower swage die respectively. Through the design of the conformal chilling block structure, the reinforced core bar, the positioning strip, the reverse draft angle and the gap, the defects of shrinkage porosity, cracks and the like which are easily generated in the casting process of complex castings are effectively overcome, the quality of the castings is improved, and the rejection rate is reduced.

Description

Technical Field

[0001] This utility model relates to the field of casting structure improvement technology, specifically to a conformal chill structure for complex castings, which is suitable for castings with complex internal cavity structures and machined bosses, and can effectively prevent defects such as shrinkage porosity and cracks from occurring in the casting process. Background Technology

[0002] During the casting process, especially for castings with complex internal cavities and machined bosses, defects such as shrinkage porosity and cracks are prone to occur at heat-bonding locations due to the complex shape and uneven wall thickness. Traditional flat chills cannot effectively solve these problems, leading to unstable casting quality and a high scrap rate. Figure 1 As shown, the product to be processed has a large internal cavity structure with a "neck" on each side, the smallest of which is only about 100mm. The corresponding core for processing this product's internal cavity is as follows: Figure 5 The design requires the core to be thinner at both ends and thicker in the middle, with the middle section weighing significantly more than the two ends. Due to gravity, the core is highly susceptible to deformation, resulting in uneven thickness (thicker on top, thinner on bottom) or even complete loss of the core, rendering the casting unusable. This structure significantly increases the difficulty of casting. Furthermore, the "neck" of the core is the heat-bonding area of ​​the casting and also the machined surface, making this area prone to shrinkage defects. Thirdly, the outer surface of the product to be machined has several machined bosses, each with drilled holes. These areas are frequently prone to defects, especially at points B and C, where a flat chill cannot meet the requirements. Therefore, a chill structure that can conform precisely to the shape of the casting and fit the surface precisely is urgently needed to improve casting quality. Summary of the Invention

[0003] The purpose of this utility model is to overcome the defects in the prior art and provide a conformal chill structure for complex castings, solving the problem that the existing sand core structure cannot meet the quality requirements of the castings to be processed.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a conformal chill structure for complex castings, comprising an outer mold, an inner core, a core frame, and conformal chills. The outer mold includes an upper mold and a lower mold. The conformal chills include a first chill, a second chill, and a third chill. The first chill is a ring with a stepped outer circumference, and its outer circumference shape conforms to the surface of the casting. The first chill is welded to the core frame, which penetrates the inner core. The second and third chills are each divided into upper and lower halves, with the upper half located on the upper mold and the lower half located on the lower mold. Positioning strips are installed at corresponding positions on the upper and lower molds to ensure accurate installation of the second and third chills. A 0.5mm gap is reserved between the second and third chills and the upper and lower molds to ensure a good fit.

[0005] Further optimization, the core bone pipe wall thickening to enhance the structural strength.

[0006] Further optimization, the second chill and third chill are provided with an inverted draft angle to ensure that the fixing of the upper half of the second chill and third chill will not fall off.

[0007] Further optimization, the core bone is provided with positioning marks at the corresponding positions of the core box for making the inner core.

[0008] Compared with the prior art, the beneficial effects of the present application are as follows: the present application effectively solves the defects such as shrinkage and cracks that are easily generated in the casting process of complex castings, improves the casting quality, and reduces the scrap rate through the conformal chill structure, reinforced core bone, positioning strip design, inverted draft angle and gap design. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 It is a schematic view of the inner cavity structure of the casting.

[0010] Figure 2 It is a schematic view of the upper mold structure.

[0011] Figure 3 It is a schematic view of the lower mold structure.

[0012] Figure 4 It is a schematic view of the position of the core bone and the first chill.

[0013] Figure 5 It is a schematic view of the inner core structure.

[0014] Figure 6 It is a schematic view of the structure and position of the first chill.

[0015] Figure 7 It is a schematic view of the structure of the second chill and the third chill Figure 1 .

[0016] Figure 8 It is a schematic view of the structure of the second chill and the third chill Figure 2 .

[0017] Marked in the figure: 1-core bone, 2-first chill, 3-second chill, 4-third chill, 5-positioning strip. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0019] As Figures 2 to 4 shown, the utility model provides a kind of conformal chill structure for complex casting, including outer mould, inner core, core bone 1 and conformal chill, outer mould includes upper mould and lower mould, conformal chill includes first chill 2, second chill 3 and third chill 4, as Figure 6 Shown, first chill 2 is the circular ring body of outer circumference is ladder type, the outer circumference shape of first chill 2 is in line with casting surface, first chill 2 is welded with core bone 1, core bone 1 is penetrated in inner core, and core bone 1 pipe wall is thickened to enhance structural strength.Core bone 1 is equipped with positioning mark in the corresponding position of core box for making inner core, to ensure the position accuracy of first chill 2.

[0020] Several processing bosses are equipped on the outer side of casting, and each has drilling hole, and plane chill cannot satisfy the processing requirement of this position, so second chill 3 and third chill 4 specially designed are in line with conformal. As Figure 7 And Figure 8 Shown, second chill 3 and third chill 4 are all divided into upper and lower halves, and upper half part is located on upper mould, and lower half part is located on lower mould.Due to the different thickness of second chill 3 and third chill 4, to prevent mixing up and wrong during on-site installation, which leads to casting scrap, positioning strip 5 is respectively equipped on the upper mould and lower mould in the corresponding position of upper half piece and lower half piece of second chill 3 and third chill 4, only correct chill can be installed in position, positioning strip 5 ensures the installation position accuracy of second chill 3 and third chill 4, and 0.5mm gap is reserved between second chill 3 and third chill 4 and upper mould and lower mould, to ensure the degree of fit.Second chill 3 and third chill 4 are equipped with drawdown mould slope, to ensure that upper half piece chill is fixed and will not fall off.

[0021] In actual casting process, first, according to the shape of casting, design conformal chill, to ensure that chill can accurately in line with the hot junction position and processing boss of casting.Then first chill is welded on reinforced core bone 1, to ensure that the position of first chill 2 is fixed.Positioning strip 5 is arranged in the corresponding position of upper mould and lower mould, to ensure the installation position accuracy of second chill 3 and third chill 4.Second chill 3 and third chill 4 are designed with drawdown mould slope, to ensure that upper half piece chill is fixed during casting.0.5mm gap is reserved between second chill 3 and third chill 4 and upper mould and lower mould, to ensure the degree of fit.

[0022] The basic principle and main features of the present application and the advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A conformal chill structure for a complex casting, characterized by: The invention relates to a casting mold, which comprises an outer mold, an inner core, a core bone and a conformal chill, the outer mold comprises an upper mold and a lower mold, the conformal chill comprises a first chill, a second chill and a third chill, the first chill is a circular ring body with a stepped outer periphery, the shape of the outer periphery of the first chill is matched with the surface of the casting, the first chill is welded on the core bone, the core bone penetrates the inner core, the second chill and the third chill are both divided into upper and lower halves, the upper half is located on the upper mold, the lower half is located on the lower mold, positioning strips are respectively arranged on the corresponding positions of the upper mold and the lower mold, the positioning strips ensure the accurate installation position of the second chill and the third chill, a 0.5mm gap is reserved between the second chill, the third chill and the upper mold and the lower mold, and the matching degree is ensured.

2. A conforming chill structure for complex castings according to claim 1, characterized in that: The wall of the core bone pipe is thickened to enhance the structural strength.

3. A conforming chill structure for complex castings according to claim 1, wherein: The second chill and the third chill are provided with a draw mold slope.

4. A conforming chill structure for complex castings according to claim 1, wherein: Positioning marks are arranged on the corresponding positions of the core bone and a core box for making the inner core.

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