Mould for casting martensitic stainless steel ring

Abstract

The martensitic stainless steel mold ring casting mold comprises an outer mold, a first core box, a second core box, a third core box and a fourth core box, the outer mold comprises an outer mold upper mold, an outer mold lower mold, a lower mold core head, a parting surface core head and an open riser, and the core boxes comprise the first core box, the second core box, the third core box and the fourth core box. After all parts of the outer mold and the core box are connected and combined by adopting the positioning pin holes, the size of the mold can be ensured to conform to a design value, the outer mold and the core box are made of wood and are stable, light and durable, triangular positioning core assembly is adopted between cores, the size precision of the cambered surface of a section ring is ensured, and the draft angles of the outer mold, a dead head and a core head are in a specified proportion. The split structure and the falling-off structure of the core box enable the molding to be simple and the combination to be convenient, the feeding distance of the riser can be effectively ensured by increasing the weight of the riser, the casting defects are reduced, and the mold is high in dimensional precision, simple in structure, light in weight and easy to operate.

Description

TECHNICAL FIELD

[0001] The utility model relates to martensitic stainless steel type ring casting mould technical field, especially a kind of martensitic stainless steel type ring casting mould. BACKGROUND

[0002] Martensitic stainless steel type ring product has strong corrosion resistance and wear resistance in running environment due to its special structure and material, and stable working condition, and has high demand in water pump field.

[0003] However, due to the large size of the product, the large wall thickness, the uneven heat distribution, the special material, the strict size and quality requirements, the need for batch production, the martensitic stainless steel is prone to crack, increases the complexity of process, leads to the structure of mould, the modeling process is cumbersome, the workload of post-processing increases, the production cost rises, and it is not conducive to batch production. Therefore, the casting difficulty is higher than that of general product, and there are many casting defects such as unqualified product size, crack and sand eye.

[0004] Therefore, in view of the deficiencies of the prior art, a martensitic stainless steel type ring casting mould is provided to solve the deficiencies of the prior art. INVENTION CONTENTS

[0005] The utility model discloses a kind of martensitic stainless steel type ring casting moulds to avoid the deficiencies of prior art, and the martensitic stainless steel type ring casting mould includes outer mould and core box, outer mould includes outer mould upper mould, outer mould lower mould, lower mould core head, parting surface core head, clear riser, core box includes first core box, second core box, third core box and fourth core box.

[0006] The above-mentioned purposes of the utility model are realized by the following technical means.

[0007] A kind of martensitic stainless steel type ring casting mould is provided, including outer mould, first core box, second core box, third core box and fourth core box, outer mould includes outer mould upper mould and outer mould lower mould, outer mould upper mould is fixedly installed with outer mould lower mould by positioning pin hole, the inner side and the outer side of outer mould lower mould are integrally formed with lower mould core head and parting surface core head respectively, and the top of outer mould upper mould is fixedly installed with four clear risers.

[0008] The first core box includes a first body, a core head retainer ring is fixedly installed at the top of the first body, and a triangular positioning one is integrally formed at the inner side of the first body.

[0009] The second core box includes a second body, a baffle is installed on the side surface of the second body, an upper movable block and a web movable block are installed on the top of the second body, a middle movable block is installed on the web movable block, and the second body, the baffle, the upper movable block, the web movable block and the middle movable block are connected and fixed by positioning pin holes.

[0010] The third core box includes a third main body 1 and a third main body 2, and the third main body 1 and the third main body 2 are connected and fixed via positioning pin holes.

[0011] The fourth core box includes a fourth main body. Four riser fillers cooperating with the four open risers are arranged on the upper part of the fourth main body. A triangular positioning three is integrally formed in the middle of the top of the fourth main body.

[0012] The outer mold upper mold, outer mold lower mold, lower mold core head, parting surface core head and open riser are drafted in the longitudinal direction. The draft angle of the outer mold upper mold and outer mold lower mold is 1:30, the draft angle of the lower mold core head and parting surface core head is 1:10, and the draft angle of the open riser is 1:15.

[0013] The lower core head is a round core head, and a triangular positioning four is integrally formed on the lower core head.

[0014] In the utility model, after the outer mold and the core box are connected by positioning pin holes, the cores are positioned together by triangles to ensure the dimensional accuracy of the arc surface of the mold ring. The draft angles of the outer mold, the open riser and the core head are in a specified proportion, which is convenient for shaping. The increase in the riser meat can effectively ensure the feed shrinkage distance of the riser and reduce casting defects. The mold has high dimensional accuracy, simple structure, light weight and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention is further described with reference to the accompanying drawings, but the contents in the accompanying drawings do not constitute any limitation to the present invention.

[0016] Figure 1 The utility model is a schematic diagram of the outer mold structure of a mold for casting a martensitic stainless steel ring.

[0017] Figure 2 The utility model is a schematic diagram of the first core box structure of a mold for casting a martensitic stainless steel ring.

[0018] Figure 3 The utility model is a schematic diagram of the second core box structure of a mold for casting a martensitic stainless steel ring.

[0019] Figure 4 The utility model is a schematic diagram of the third core box structure of a mold for casting a martensitic stainless steel ring.

[0020] Figure 5 This is a schematic structural diagram of the fourth core box of a mold for casting a martensitic stainless steel ring according to the present invention.

[0021] from Figures 1 to 5 Including:

[0022] 1. External mold;

[0023] 11. Outer mold upper mold, 12. Outer mold lower mold, 13. Lower mold core head, 14. Parting surface core head, 15. Open riser;

[0024] 2. First core box;

[0025] 21. First body, 22. Core head retaining ring, 23. Triangular positioning 1, 24. Triangular positioning 2;

[0026] 3. Second core box;

[0027] 31. Second body, 32. Baffle, 33. Upper movable block, 34. Rib plate movable block, 35. Middle movable block;

[0028] 4. The third core box;

[0029] 41, third subject one, 42, third subject two;

[0030] 5. The fourth core box;

[0031] 51. The fourth main body, 52. Riser meat increase, 53. Triangle positioning three;

[0032] 6. Triangulation positioning 4. DETAILED DESCRIPTION

[0033] The present invention will be further described with reference to the following embodiments.

[0034] Example 1.

[0035] like Figure 1 As shown, the outer mold upper mold 11 is fixed above the outer mold lower mold 12 through the positioning pin holes, the lower mold core head 13 and the parting surface core head 14 are an integral structure with the outer mold lower mold 12, the two positioning pins below the open riser 15 are connected and combined with the two positioning holes of the outer mold upper mold 11, and the four open risers 15 are fixed above the outer mold upper mold 11.

[0036] like Figure 2 As shown, the core head retaining ring 22 of the first core box 2 is connected and fixed to the first body 21 through the positioning pin hole, the triangular positioning 1 23 and the first body 21 are an integral structure, and the triangular positioning 2 24 and the core head retaining ring 22 are an integral structure.

[0037] like Figure 3 As shown, the second body 31 of the second core box 3 is connected and fixed with the baffle 32, the upper movable block 33, the rib movable block 34 and the middle movable block 35 through positioning pin holes to ensure dimensional accuracy.

[0038] like Figure 4 As shown, the third main body 1 41 and the third main body 2 42 of the third core box 4 are connected and fixed through positioning pin holes.

[0039] like Figure 5As shown, the fourth main body 51 of the fourth core box 5 is provided with four riser pads 52 which are matched with the open riser 15. The riser pads 52 are integral with the fourth main body 51. The riser pads 52 are used to better supplement the casting for the open riser 15.

[0040] The triangular positioning one 23 in the first core box 2 and the triangular positioning three 53 in the fourth core box 5 ensure that the riser pads 52 can coincide with the open riser 15.

[0041] The outer mold 1, the first core box 2, the second core box 3, the third core box 4 and the fourth core box 5 are made according to the process size and are made of wood, which is stable in structure, light in weight and durable.

[0042] The outer mold upper mold 11, the outer mold lower mold 12, the lower mold core head 13, the parting surface core head 14 and the open riser 15 are subjected to the draft treatment in the longitudinal direction. The draft angle of the outer mold upper mold 11 and the outer mold lower mold 12 is 1:30, the draft angle of the lower mold core head 13 and the parting surface core head 14 is 1:10, and the draft angle of the open riser 15 is 1:15. The draft treatment facilitates the molding process and reduces the defects of the sand mold.

[0043] The second core box 3 is a 1 / 2 core group, that is, two sand cores are formed in one core box and the two sand cores are respectively placed. The advantage of the core group is to reduce the weight of the sand mold and increase the bearing capacity of the core support.

[0044] The working process of the embodiment is as follows:

[0045] First step: as shown in Figure 1 、 2 , 3, 4, 5, the assembled outer mold 1, the first core box 2, the second core box 3, the third core box 4 and the fourth core box 5 are placed on the molding platform.

[0046] Second step: a box sleeve with a distance of 200mm from the outer mold 1 is sleeved on the outer side of the outer mold 1, and resin sand is filled between the box sleeve and the outer mold 1, and the plane is tamped and leveled. The core iron and the exhaust rope are placed in the core box, and then the resin sand is filled, tamped and leveled.

[0047] Third step: after the outer mold 1 and the core box filled with resin sand are statically waited for a period of time, the hardening, strength and hardness of the resin sand are waited to reach the requirements of the sand mold.

[0048] Fourth step: the outer mold 1 and the core box are lifted, the first core box 2, the second core box 3, the third core box 4 and the fourth core box 5 are lifted according to the parting surface of the outer mold 1 and the direction of the draft. The first core box 2, the second core box 3, the third core box 4 and the fourth core box 5 are lifted according to the parting surface of the outer mold 1 and the direction of the draft.

[0049] In the present invention, the outer mold 1, the first core box 2, the second core box 3, the third core box 4 and the fourth core box 5 are connected by positioning pin holes, so that the size of the mold can be guaranteed to be consistent with the design value. The outer mold 1 and the core box are made of wood, which is stable, lightweight and durable. The cores are positioned with a triangle to ensure the dimensional accuracy of the arc surface of the mold ring. The draft angles of the outer mold 1, the riser and the core head are in a specified proportion, which is convenient for shaping. The split structure and the detachable structure of the core box make the shaping simple, and the riser meat 52 can effectively ensure the shrinkage compensation distance of the riser and reduce casting defects. The mold has high dimensional accuracy, simple structure, light weight and is easy to operate.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A mold for casting a martensitic stainless steel ring, characterized by: The outer mold comprises an outer mold, a first core box, a second core box, a third core box and a fourth core box. The outer mold comprises an outer mold upper mold and an outer mold lower mold. The outer mold upper mold and the outer mold lower mold are fixedly installed through positioning pin holes. The inner side and the outer side of the outer mold lower mold are respectively integrally formed with a lower mold core head and a parting surface core head. Four open risers are fixedly installed on the top of the outer mold upper mold. The first core box includes a first main body, a core head retaining ring is fixedly installed on the top of the first main body, a first triangular positioning member is integrally formed on the inner side of the first main body, and a second triangular positioning member is integrally formed on the inner side of the core head retaining ring; The second core box includes a second main body, a baffle is installed on the side of the second main body, an upper loose block and a rib loose block are installed on the top of the second main body, a middle loose block is installed on the rib loose block, and the second main body and the baffle, the upper loose block, the rib loose block, and the middle loose block are all connected and fixed through positioning pin holes; The third core box includes a third main body 1 and a third main body 2, wherein the third main body 1 and the third main body 2 are connected and fixed via a positioning pin hole; The fourth core box includes a fourth main body. Four riser fillers are provided on the upper part of the fourth main body to cooperate with the four open risers. A triangular positioning member is integrally formed in the middle of the top of the fourth main body.

2. The mold for casting a martensitic stainless steel ring according to claim 1, characterized in that: The outer mold upper mold, the outer mold lower mold, the lower mold core head, the parting surface core head and the open riser are drafted in the longitudinal direction. The draft angle of the outer mold upper mold and the outer mold lower mold is 1:30, the draft angle of the lower mold core head and the parting surface core head is 1:10, and the draft angle of the open riser is 1:

15.

3. The mold for casting a martensitic stainless steel ring according to claim 1, characterized in that: The lower core head is a round core head, and a triangular positioning portion is integrally formed on the lower core head.

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