Overlapped-type casting method of large-size annular steel casting

[0032] In order to more clearly describe the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings in the following description are some embodiments of the present invention. Ordinary technicians can obtain other drawings based on these drawings without creative work.

[0033] The embodiment of the present invention provides a superposition casting method for large-size annular steel castings, which includes the following steps:

[0034] See Figure 1 to Figure 4 , Core making: using a core box to prepare sand cores of superimposed castings, the sand cores of the superposed castings include a first sand core 10, a second sand core 20, and a third sand core 30 arranged from top to bottom. The sand core 20 also includes upper and lower partition sand cores 40, the upper and lower partition sand cores 40 and the second sand core 20 are connected as a whole, and the inner surface of the first sand core 10 and the inner surface of the second sand core 20 form a superimposed casting Part of the outer surface of 100, the outer surface of the third sand core 30 forms part of the inner surface of the superimposed casting 100;

[0035] Making the outer pattern: the outer pattern includes the middle box outer pattern 60 and the lower box outer pattern 70. The middle box outer pattern 60 forms a middle box outer mold cavity containing the first sand core 10 and the second sand core 20, and the lower box outer pattern 70 is formed A mold cavity outside the lower box containing the third sand core 30;

[0036] That is, the inner surface of the outer pattern 60 of the middle box forms a part of the inner surface of the superimposed casting, and the outer surfaces of the first sand core 10 and the outer surface of the second sand core 20 form another part of the inner surface of the superimposed casting 100; The surface forms part of the outer surface of the superimposed casting 100, and the inner surface of the second sand core 20 forms another part of the outer surface of the superimposed casting 100, thereby forming the outer and inner surfaces of the entire superimposed casting 100.

[0037] In the process of preparing the outer pattern, it is necessary to put the outer pattern into the sand box, and take out the outer pattern after sand shooting. This corresponds to the overall product of the superimposed casting in the present invention, due to the shape limitation of the lower part of the fourth-stage ring casting 103 , It is difficult to shoot the molding sand completely, and in order not to damage the outer mold cavity of the outer mold sample body when the outer pattern is taken out, the outer pattern is designed as the middle box outer pattern 60 and the lower box outer pattern 70, and corresponding A three-box shape is used to solve the above problems.

[0038] See Figure 5 , Modeling: Put the outer pattern 70 of the lower box into the lower sand box 130, put the outer pattern 60 of the middle box into the middle sand box 120, combine the upper sand box 110 and the middle sand box 120, and fill the sand After compaction, the outer pattern is taken out to form the lower box outer mold cavity and the middle box outer mold cavity. The inner wall of the middle box outer mold cavity includes the inner wall forming the five-stage ring casting 101, the inner wall forming the upper and lower partition casting 102, and the inner wall forming the upper and lower partition casting 102. The inner wall of the upper half casting of the grade ring;

[0039] See Image 6 , Lower core: Put the third sand core 30 into the mold cavity outside the lower box, and keep the inner surface of the third sand core 30 in close contact with the inner wall of the mold cavity outside the lower box, so that the outer surface of the third sand core 30 and The outer wall of the lower box outer mold cavity forms a part of the casting molding cavity of the superimposed casting. The part of the casting molding cavity is the lower half casting cavity 84 of the four-stage ring. The second sand core 20 and the first sand core 10 Put into the mold cavity outside the middle box, keep the outer surfaces of the second sand core 20 and the first sand core 10 in close contact with the outer wall of the mold cavity outside the middle box, so that the inner surfaces of the second sand core 20 and the first sand core 10 Between the surface and the inner wall of the mold cavity outside the middle box, another part of the casting molding cavity of the superimposed casting is formed. The other part of the casting molding cavity is a five-stage ring casting cavity 81, an upper and lower partition cavity 82, and a fourth-stage ring The semi-casting cavity 83, the five-stage ring casting cavity 81, the upper and lower partition cavity 82, the fourth-stage ring upper half casting cavity 83 and the fourth-stage ring lower half casting cavity 84 together constitute the pouring molding of the superimposed casting Cavity

[0040] Close the box: close and lock the lower sand box 130, the middle sand box 120, and the upper sand box 110 in sequence;

[0041] pouring;

[0042] See Figure 7 , Boxing: Open the sand box, take out the casting after pouring, and obtain the blank 90 of the superimposed casting. The blank 90 of the superimposed casting includes the five-stage ring casting 101, the upper and lower partition castings 102, four Grade ring casting 103, riser 91, subsidy 92;

[0043] Remove the riser 91 and subsidy 92;

[0044] See Figure 8 to Figure 11 , Cutting parting: cutting and separating the blank 90 of the superimposed casting along the upper and lower partition castings 102 to obtain the fourth-level ring casting 103 and the fifth-level ring casting 101.

[0045] Further, the core-making step is a step-by-step core-making, and the step-by-step core-making is: the core box adopts at least four single core boxes, the single core box includes a first sand core single core box, The second sand core single core box, the third sand core single core box, the left and right partition core boxes, the first sand core single core box is used to prepare the first sand core single core 11, the second sand core single The body core box prepares the second single sand core single sand core 21 and the upper and lower partition sand cores 40 which are connected as one body. The third single sand core single core box is used to prepare the third single sand core 31, and the left and right partition cores are used. The box prepares left and right partition sand cores 50, a plurality of first single sand cores 11 and two left and right partition sand cores 50 are spliced ​​together to form a first sand core 10, and a plurality of second monomers connected with upper and lower partition sand cores 40 The sand core 21 and the two left and right partition sand cores 50 are spliced ​​to form the second sand core 20, and then a plurality of third sand core single sand cores 31 and the two left and right partition sand cores 50 are spliced ​​to form the third sand core 30.

[0046] Further, a movable block is arranged inside the first single sand core single core box and/or the second single sand core single core box and/or the third single sand core single core box to form a structure corresponding to the movable block The first single sand core and/or the second single sand core and/or the third single sand core.

[0047] Since the first sand core single core box, the second sand core single core box, and the third sand core single core box use universal core boxes, between the two first sand core single core boxes obtained by core making, or When there is a small part of the structure inconsistency between the two second sand cores or between the two third single sand cores, use the method of adding live blocks to solve the problem, and place the live blocks inside the core box The core box is relatively fixed with the core box, and then the core box with the movable block is used to make the core to obtain the monomer sand core of the corresponding structure.

[0048] Considering the symmetry of ring castings, the sand core corresponding to the core box is generally used as a whole, and the local production blocks are interchanged, which saves mold production costs and mold storage space.

[0049] Such as image 3 In this case, the second single core sand core 21 has a positioning groove 211 structure, while other second single core sand cores do not have a positioning groove 211 structure. Therefore, the positioning groove 211 is provided in the manufacturing process. When the second single sand core single sand core 21 is used, a movable block is arranged inside the second single core single core box, and the structure of the movable block has the same structure as the positioning groove 211, and then the core box is used to make the core, The second single core sand core 21 with the positioning groove 211 is obtained.

[0050] Further, in the step of making the outer pattern, the inner surface of the middle box outer pattern 60 includes the inner surface forming the inner wall of the five-stage ring casting 101, the inner surface forming the inner wall of the upper and lower partition casting 102, and the inner surface forming the fourth-stage ring The inner surface of the inner wall of the half casting, so that the inner wall of the outer mold cavity of the inner box formed by the outer pattern 60 of the inner box includes the inner wall forming the fifth-stage ring casting 101, the inner wall forming the upper and lower partition castings 102, and the upper half casting of the fourth-stage ring The outer surface of the lower box outer pattern 70 includes the outer surface of the outer wall of the lower half casting of the four-stage ring. After the pouring is completed, the formed superimposed casting includes the five-stage ring casting 101 connected from top to bottom as a whole, Diaphragm casting 102, four-stage ring casting 103.

[0051] Further, after the cutting and parting step, the method further includes cutting and separating the fourth-level ring casting 103 and the fifth-level ring casting 101 along the left and right partition castings 104, the fourth-level ring casting half-ring 105 and the fifth-level ring casting half. 环件106。 Ring 106.

[0052] The steps in the method of the embodiment of the present invention can be adjusted, merged, and deleted in order according to actual needs.

[0053] The modules or units in the device of the embodiment of the present invention may be combined, divided, and deleted according to actual needs.

[0054] The above-disclosed are only the preferred embodiments of the present invention. Of course, the scope of rights of the present invention cannot be limited by this. Those of ordinary skill in the art can understand all or part of the procedures for implementing the above-mentioned embodiments and make them in accordance with the claims of the present invention. The equivalent changes still fall within the scope of the invention.