Inner hole gapless forming chilling block

Abstract

The utility model discloses an inner hole gapless forming chilling block which is in a cylinder shape formed by splicing a plurality of chilling blocks in the radial direction, each chilling block is an iron casting, the width of a gap between every two adjacent chilling blocks is smaller than 2mm, a plurality of first protruding blocks protruding upwards are fixed to the upper end of each chilling block, and the first protruding blocks protrude upwards. A plurality of first protruding blocks protruding downwards are fixed to the lower end of each chilling block, the height of the second protruding blocks is larger than that of the first protruding blocks, and a second inclined face is arranged on the radial outer surface of each second protruding block. And the top and the bottom of the inner hole of the core box are respectively provided with a positioning surface and a supporting surface which are matched with the inclination of the first inclined surface and the second inclined surface. According to the forming chilling block, the error-tolerant rate during core manufacturing can be greatly increased, the casting quality is effectively guaranteed, the mold opening mode after casting is simple, and the production requirements of oil cylinder type castings and castings with strict requirements of customers can be met.

Description

Technical Field

[0001] The utility model relates to an auxiliary tool for casting production, in particular to a chill with gapless inner hole forming. Background Art

[0002] At present, there are relatively high requirements for cast products such as wind power, industrial machinery, screw machines, injection molding machines, and hydraulic presses. It is required that the finished castings have no obvious casting defects. During the casting production process, chills are often used to effectively prevent or solve the shrinkage cavity and shrinkage porosity tendencies of castings. Generally, the process is designed according to the structure of the casting, and the hot spots of the casting are analyzed. Chills are usually used for rapid cooling of thicker and larger parts and hot spot parts to achieve the effect of preferential solidification or similar sequential solidification, so as to ensure the quality of the casting, avoid obvious or machined-exposed casting shrinkage cavity / shrinkage porosity defects, and meet the usage requirements of the casting.

[0003] With the development of market demand and the improvement of customer requirements, the quality requirements for products have been gradually increased, from the initial requirements for the casting contour to the current quality acceptance requirements such as no exposed casting defects or zero defects in the machined castings. Using chills as a process to eliminate hot spots is a relatively traditional and effective process solution. However, new casting defects caused by the use and storage of chills, as well as improper chill design or management, are also emerging in an endless stream. For example, the thickness of the chill directly affects the number of times the chill can be used, and also affects the quality of the casting. For example, an overly thin chill is prone to deformation, and the strength of the chill during use is reduced, or the surface of the chill melts with the molten iron in contact. Too many abnormalities will also cause material waste and pose potential safety hazards during operation; if the chill is too thick, defects such as surface supercooling, iron skin, and cold shut will appear on the casting. At the same time, if the gap of the chill is designed too large (such as the common 20 - 30 mm), it will cause uneven cooling of the casting, and cracking defects corresponding to the gap position of the chill will appear on the casting. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a chill with gapless inner hole forming in view of the deficiencies of the prior art. This forming chill can greatly improve the error tolerance rate during core making, effectively ensure the quality of the casting, and the mold opening method after casting is relatively simple, which can meet the production needs of castings such as oil cylinder castings and castings with relatively strict customer requirements.

[0005] The technical solution adopted by the present utility model to solve the above technical problems is as follows: An internal hole gapless forming chill, which is a cylindrical shape formed by radially splicing several chills. Each of the chills is a cast iron part, and the gap width between two adjacent chills is less than 2 mm. Each upper end of the chills is fixed with several upwardly protruding first convex blocks, and the radially outer surface of each of the first convex blocks is provided with a first inclined surface. Each lower end of the chills is fixed with several downwardly protruding second convex blocks. The height of the several second convex blocks is greater than the height of the several first convex blocks. The radially outer surface of each of the second convex blocks is provided with a second inclined surface. During core making, the forming chill is placed inside the inner hole of the core box. The top of the inner hole of the core box is provided with a positioning surface that matches the slope of the first inclined surface, and the bottom of the inner hole of the core box is provided with a supporting surface that matches the slope of the second inclined surface.

[0006] The forming chill of the present utility model is a cylindrical shape formed by radially splicing several chills, which can greatly improve the error tolerance rate during core making, stably and effectively ensure the quality of the casting, and the mold opening method after casting is relatively simple. The gap width between two adjacent chills that are spliced to form the forming chill is less than 2 mm. For castings with diameters and heights that can reach several meters or even larger, this 2-mm gap can be ignored, which can ensure the flatness of the casting surface and also avoid new quality abnormalities caused by sand plugging, cracking, and coating penetration problems in the chill gap. It not only meets the usage requirements of the forming chill but also meets the requirements of micro-deformation of the chill and convenient mold opening operation after casting. When opening the mold, the first convex block can be directly knocked to facilitate the rapid demolding of the chill. The size and wall thickness of the forming chill are determined according to the diameter and wall thickness of the casting to be produced. The wall thickness of the forming chill is guaranteed, and the quality is stable, which can meet the cooling requirements of castings with different wall thicknesses. When designing and manufacturing the chill according to the size of the forming chill, there is no need to consider the casting shrinkage rate, and it can be directly manufactured according to the design size, using the actual shrinkage size of the forming chill as the fitting gap.

[0007] During core making, the supporting surface of the core box contacts the second inclined surface to support the entire forming chill, facilitating the stable placement of the forming chill and at the same time avoiding the problem of core box damage and facilitating subsequent cleaning.

[0008] Preferably, the first inclined surface slopes obliquely from top to bottom towards the radial outer side of the forming chill, and the second inclined surface slopes obliquely from top to bottom towards the radial inner side of the forming chill. During core making, the top surfaces of the several first convex blocks are below the top surface of the core box, and the bottom surfaces of the several second convex blocks are flush with the bottom surface of the core box.

[0009] Preferably, several lifting handles are integrally cast on the inner surface of each chill, which is convenient for the lifting and hoisting of the chill during core making and after mold opening.

[0010] Preferably, the number of chills forming the shaped chill is an even number, which is convenient for cleaning the chills after use. In practical applications, the number of chills is determined according to the diameter of the casting to be produced.

[0011] As a further preference, each of the chills is bisected into two sub-blocks or trisected into three sub-blocks in the height direction to facilitate the hoisting and use of the chills during the production of castings with a relatively large height.

[0012] As a further preference, the core box is formed by splicing a left half and a right half, and the left half or the right half is segmented in the height direction, which is convenient for placing the chills during core making and for opening the core box.

[0013] Compared with the prior art, the utility model has the following advantages:

[0014] 1) The shaped chill of the utility model is a cylindrical shape formed by radially splicing several chills, which can greatly improve the error tolerance during core making. At the same time, the wall thickness of the shaped chill is guaranteed and the quality is stable, which can effectively ensure the quality of the casting. Moreover, the mold opening method after casting is relatively simple, which can meet the production needs of castings such as oil cylinder castings and castings with relatively strict customer requirements.

[0015] 2) The gap width between two adjacent chills forming the shaped chill of the utility model is less than 2 mm. For castings with a diameter and height that can reach several meters or even larger, this 2-mm gap can be ignored, which can ensure the flatness of the casting surface and can also avoid new quality abnormalities caused by sand plugging, cracking, and coating penetration in the chill gap. It not only meets the use requirements of the shaped chill but also meets the requirements of micro-deformation of the chill and convenient mold opening operation after casting. Moreover, when opening the mold, the first convex block can be directly knocked to facilitate the rapid demolding of the chill. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the external view schematic diagram of the gapless shaped chill in the embodiment;

[0017] Figure 2 is the front view of the gapless shaped chill in the embodiment;

[0018] Figure 3 is Figure 2 the A-A cross-sectional view in

[0019] Figure 4 is Figure 2 the B-B cross-sectional view in

[0020] Figure 5 is the state schematic diagram during core making (the core box is not fully closed);

[0021] Figure 6Schematic diagram of the effect of the formed chill in the casting;

[0022] Figure 7 corresponding to Figure 6 longitudinal sectional view;

[0023] The specific reference numerals in the figure are as follows:

[0024] 1 - chill, 11 - first convex block, 12 - second convex block, 13 - lifting handle, 14 - first inclined surface, 15 - second inclined surface, 21 - left half part, 22 - right half part, 23 - positioning surface, 24 - supporting surface, 3 - casting. Specific implementation mode

[0025] The present utility model will be further described in detail below in conjunction with the embodiments with reference to the drawings.

[0026] An inner hole gapless formed chill of the embodiment, as Figures 1 to 4 shown, the formed chill is a cylindrical shape radially spliced by four chills 1. Each chill 1 is a cast iron part. Two lifting handles 13 are integrally cast on the inner surface of each chill 1. The gap width W between adjacent chills 1 is 2 mm or less. One upward convex first convex block 11 is fixed at the upper end of each chill 1. The radially outer surface of each first convex block 11 is provided with a first inclined surface 14. One downward convex second convex block 12 is fixed at the lower end of each chill 1. The height of the four second convex blocks 12 is greater than the height of the four first convex blocks 11. The radially outer surface of each second convex block 12 is provided with a second inclined surface 15. The first inclined surface 14 is obliquely formed towards the radial outside of the formed chill from top to bottom, and the second inclined surface 15 is obliquely formed towards the radial inside of the formed chill from top to bottom.

[0027] During core making, as Figure 5 shown, the formed chill is placed inside the inner hole of the core box. The core box is spliced by a left half part 21 and a right half part 22. The left half part 21 or the right half part 22 is divided into two sections in the height direction. The top of the inner hole of the core box is provided with a positioning surface 23 matching the slope of the first inclined surface 14. The bottom of the inner hole of the core box is provided with a supporting surface 24 matching the slope of the second inclined surface 15. The supporting surface 24 contacts the second inclined surface 15 to support the whole formed chill. The top surfaces of the four first convex blocks 11 are below the top surface of the core box and serve as the upper mold core heads, and it is sufficient to extend 10 - 15 mm; the bottom surfaces of the four second convex blocks 12 are flush with the bottom surface of the core box and serve as the lower mold core heads. After casting, the schematic diagram of the effect of the formed chill in the casting 3 can be seen in Figure 6 and Figure 7 .

[0028] The gap width W between two adjacent chill blocks 1 that are spliced to form the above-mentioned shaped chill is 2 mm or less. For a casting with a diameter and height that can reach several meters or even larger, this 2-mm gap can be ignored, which can ensure the flatness of the casting surface and also avoid new quality abnormalities caused by sand jamming, cracking, and coating penetration in the gap of the chill block 1. It not only meets the usage requirements of the shaped chill but also meets the requirements of micro-deformation of the chill block 1 and convenient mold opening operation after casting. Moreover, when opening the mold, the first convex block 11 can be directly knocked to facilitate the rapid demolding of the chill block 1.

[0029] In practical applications, according to the height of the casting to be produced, the design of dividing each chill block 1 into two sub-blocks or three sub-blocks in the height direction can also be adopted.

Claims

1. A cold iron with no gap in inner hole, characterized in that: The shaped chill is cylindrically shaped and is composed of several pieces of chill radially spliced ​​together. Each piece of the chill is a cast iron piece. The width of the gap between two adjacent pieces of chill is less than 2 mm. Several first protrusions protruding upward are fixed to the upper end of each piece of the chill, and the radial outer surface of each first protrusion is provided with a first inclined surface. Several second protrusions protruding downward are fixed to the lower end of each piece of the chill. The height of the several second protrusions is greater than the height of the several first protrusions, and the radial outer surface of each second protrusion is provided with a second inclined surface. When making the core, the shaped chill is built into the inner hole of the core box, and the top of the inner hole of the core box is provided with a positioning surface matching the inclination of the first inclined surface, and the bottom of the inner hole of the core box is provided with a supporting surface matching the inclination of the second inclined surface.

2. The inner hole gapless forming chiller according to claim 1, characterized in that: The first inclined surface is inclined from top to bottom toward the radial outer side of the formed cold iron, and the second inclined surface is inclined from top to bottom toward the radial inner side of the formed cold iron. When making the core, the top surfaces of some of the first protrusions are located below the top surface of the core box, and the bottom surfaces of some of the second protrusions are flush with the bottom surface of the core box.

3. The inner hole gapless forming chiller according to claim 1, characterized in that: The inner surface of each piece of cold iron is integrally cast with a plurality of hanging handles.

4. A cold iron with no inner hole gap according to any one of claims 1 to 3, characterized in that: The number of the chills constituting the shaped chill is an even number.

5. The inner hole gapless forming chiller according to claim 4, characterized in that: Each block of the chill is divided into two equal parts or three equal parts in height direction into three sub-blocks.

6. The inner hole gapless forming chiller according to claim 4, characterized in that: The core box is formed by splicing a left half and a right half, and the left half or the right half is arranged in sections in the height direction.

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