Gravity type casting mold
By setting up multiple retractable risers and channel structures in the casting mold, the problems of thin-wall loose and thick-wall defects in gravity casting are solved, and efficient casting of aluminum alloy connecting shells is achieved, which improves production efficiency and reduces cost.
Patent Information
- Application Number
- CN202323529810.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-22
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2033-12-22
AI Technical Summary
The existing gravity casting method has problems such as insufficient pouring of thin-walled parts and loose parts of thick-walled parts in the production of aluminum alloy connecting shells. Although low-pressure casting partially alleviates these problems, it leads to complex molds, low production efficiency and high cost. .
A gravity casting mold is designed, including top mold, outer mold, sand core, inner mold, positioning sleeve and runner block, and multiple shrinkage riser structures and channels are set up, and the aluminum liquid is obliquely oriented from the side runner. Filling, using gap channels and groove structures to achieve stable filling of aluminum liquid, reducing casting defects.
Through this mold design, smooth filling of aluminum liquid is achieved, casting defects are reduced, production efficiency is improved, and production costs are reduced.
Smart Images
Figure CN222198801U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of casting molds, in particular to a gravity casting mold. Background Art
[0002] At present, when aluminum alloy connection shells are produced by gravity casting, the existing scheme has problems such as insufficient casting of thin-walled parts and loose defects in thick-walled parts. The low-pressure casting and other methods used to produce blanks for aluminum alloy connection shells can partially alleviate the problems of insufficient casting of thin-walled parts and loose defects in thick-walled parts. However, at the same time, low-pressure casting molds and casting equipment become more complicated than weight casting, and there are problems such as low casting production efficiency and high production costs. Therefore, the research of new gravity casting molds has become the focus of research in the industry. Utility Model Content
[0003] In the gravity casting mold of the present application, aluminum liquid is injected from the side runner and gradually fills the mold cavity obliquely upward. The top and bottom of the mold are provided with riser structures for shrinkage compensation, which significantly improves the looseness problem of the casting.
[0004] The utility model provides the following technical solutions:
[0005] A gravity casting mold, comprising: a top mold, an outer mold, a sand core, an inner mold, a positioning sleeve and a runner block;
[0006] The sand core and the positioning sleeve are respectively sleeved and connected to the upper side end and the lower side end of the inner mold; the outer mold is connected to the positioning sleeve near one end of the sand core, wrapping the sand core inside, and a casting mold cavity for molding is provided between the outer mold and the sand core; a gap channel is left between the sand core and the positioning sleeve;
[0007] The top mold cover is pressed on the top of the sand core, and a first shrinkage feed riser is formed between the top mold and the outer mold;
[0008] The runner block is arranged at the top of the outer mold, the runner block and the outer mold are provided with a first casting channel connected, and the bottom end of the outer mold is provided with a second casting channel connected to the gap channel and the first casting channel respectively;
[0009] The gap channel portion is positioned to be provided with a first groove, and the first groove is used as a second shrinkage feeder.
[0010] Furthermore, the inner wall of the first groove is coated with thermal insulation paint.
[0011] Furthermore, the first casting channel, the second casting channel and the gap channel are respectively connected to form a connected straight runner, a cross runner and an inner runner structure; the included angle between the straight runner and the cross runner is an obtuse angle.
[0012] Furthermore, the inner wall of the outer mold is provided with a plurality of annular groove groups.
[0013] Furthermore, the outer mold is a split structure, and the outer mold includes a left outer module and a right outer module, and the left outer module and the right outer module are spliced into an outer mold as a whole.
[0014] Furthermore, a vent hole is provided on the top mold, and the vent hole is connected to the inner mold and the sand core.
[0015] Furthermore, the inner hole for installing the sand core sleeve is a polygonal structure hole to prevent the sand core from rotating; preferably, the inner hole adopts a polygonal structure hole that is small at the top and large at the bottom.
[0016] Furthermore, the inner mold, the outer mold and the top mold are all provided with cooling water channels.
[0017] Beneficial Effects
[0018] The utility model provides a gravity casting mold, comprising: a top mold, an outer mold, a sand core, an inner mold, a positioning sleeve and a runner block; the sand core and the positioning sleeve are respectively sleeved and connected to the upper side end and the lower side end of the inner mold; the outer mold is connected to the positioning sleeve close to one end of the sand core, wrapping the sand core inside, and a casting mold cavity for molding is arranged between the outer mold and the sand core; a gap channel is left between the sand core and the positioning sleeve; the top mold cover is pressed on the top of the sand core, and a first shrinkage-feeding riser is formed between the top mold and the outer mold; the runner block is arranged on the top of the outer mold, and the runner block and the outer mold are provided with a connected first casting channel, and the bottom end of the outer mold is provided with a second casting channel respectively connected to the gap channel and the first casting channel; the gap channel portion is positioned to be provided with a first groove, and the first groove is used as a second shrinkage-feeding riser. In the gravity casting mold of the present application, the ingate is connected to the bottom of the casting, and the upper end of the ingate is arranged to be close to the lower end of the finished casting shell to be formed, so that the molten aluminum first flows into the second shrinkage feeding riser from the ingate, and after the molten aluminum fills the second shrinkage feeding riser, the molten aluminum then fills the mold upward layer by layer to achieve smooth filling and avoid casting defects. At the same time, the first shrinkage feeding riser arranged at the upper end of the finished casting shell to be formed can be used for shrinkage feeding, further reducing casting defects. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0020] Figure 1 It is a structural schematic diagram of a gravity casting mold in this embodiment;
[0021] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure at DD in the middle;
[0022] Figure 3 3. It is a cross-sectional structural diagram (three-dimensional) of the gravity casting mold of this embodiment;
[0023] Figure 4 is a schematic diagram of the layout structure of the connection housing cast by the gravity casting mold of this embodiment;
[0024] Figure 5 yes Figure 1 A schematic diagram of the structure of the middle positioning sleeve;
[0025] Figure 6 yes Figure 1 Schematic diagram of the structure of the middle inner mold;
[0026] Figure 7 yes Figure 1 Schematic diagram of the installation structure of the middle sand core and the inner mold;
[0027] Figure 8 yes Figure 1 Schematic diagram of the structure of the middle and outer molds;
[0028] Among them, 1. top mold, 2. outer mold, 3. sand core, 4. inner mold, 5. positioning sleeve, 6. runner block, 7. first shrinkage feed riser, 8. first groove, 9. groove group, 10. straight runner (first casting channel), 11. cross runner (second casting channel), 12. inner runner (gap channel), 13. connecting shell (casting shell). DETAILED DESCRIPTION
[0029] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present application.
[0030] It should be noted that when an element is referred to as being "fixed on" or "set on" another element, it can be directly on the other element or indirectly set on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.
[0031] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.
[0032] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the effects and purposes that can be achieved by this application.
[0033] This embodiment is written in a progressive manner.
[0034] Reference Figure 1-Figure 8 As shown, a gravity casting mold comprises: a top mold 1, an outer mold 2, a sand core 3, an inner mold 4, a positioning sleeve 5 and a runner block 6;
[0035] The sand core and the positioning sleeve are respectively sleeved and connected to the upper side end and the lower side end of the inner mold; the outer mold is connected to the positioning sleeve near one end of the sand core, wrapping the sand core inside, and a casting mold cavity for molding is provided between the outer mold and the sand core; and a casting mold cavity for molding is provided between the outer mold and the sand core;
[0036] A gap channel is left between the sand core and the positioning sleeve; the top mold cover is pressed on the top of the sand core, and a first shrinkage feed riser 7 is formed between the top mold and the outer mold;
[0037] The runner block is arranged at the top of the outer mold, the runner block and the outer mold are provided with a first casting channel connected, and the bottom end of the outer mold is provided with a second casting channel connected to the gap channel and the first casting channel respectively;
[0038] The gap channel portion is positioned to be provided with a first groove 8, which is used as a second feeding riser.
[0039] In the above scheme, a first shrinkage-supporting riser structure is arranged at the upper part of the connecting shell (casting shell) to be cast, and a second shrinkage-supporting riser structure is arranged at the lower part of the connecting shell (casting shell) to be cast, so as to fully realize the shrinkage-supporting effect of the casting shell 13; specifically, the endogate is connected to the bottom of the casting, and the upper end of the endogate is arranged to be close to the lower end of the finished casting shell to be formed, so as to make the molten aluminum flow from the runner into the second shrinkage-supporting riser first, and after the molten aluminum fills the second shrinkage-supporting riser, the molten aluminum is then filled upward layer by layer to achieve smooth filling and avoid casting defects. At the same time, the first shrinkage-supporting riser arranged at the upper end of the finished casting shell to be formed can be used for shrinkage-supporting filling, thereby further reducing casting defects.
[0040] Preferably, the cross-sectional dimension of the first feeding riser is larger than the interface dimension of the upper wall thickness area of the casting shell, and the cross-sectional dimension of the second feeding riser is larger than the interface dimension of the lower wall thickness area of the casting shell, so as to fully improve the feeding effect.
[0041] It should be noted that the gravity casting mold of the present application is preferably suitable for casting aluminum alloy liquid to cast aluminum alloy castings.
[0042] As a preferred embodiment, the inner wall of the first groove is coated with a thermal insulation coating; the first groove with the thermal insulation coating can slow down the solidification speed of the aluminum liquid at this location, realize the shrinkage of the aluminum liquid at this location from bottom to top, and help eliminate the loose defects of the casting. The first groove of this embodiment has a larger size, generally with a width of 5-10mm smaller than the lower cross-section of the casting, and a depth of 5-10mm.
[0043] As a preferred embodiment, the first casting channel, the second casting channel and the gap channel are respectively connected to form a connected straight runner 10, a cross runner 11 and an inner runner 12 structure; the angle between the straight runner and the cross runner is an obtuse angle. The preferred obtuse angle A is 100-130 degrees, the purpose of which is to reduce the loss of aluminum liquid flow velocity when the aluminum liquid changes direction from the straight runner to the cross runner, and avoid excessive reduction in the aluminum liquid flow velocity. The obtuse angle value should not be too large, otherwise it will cause the aluminum liquid to impact the lower end surface of the casting, resulting in aluminum liquid splashing and forming casting bubble defects.
[0044] As a preferred embodiment, the inner wall of the outer mold is provided with a plurality of annular groove groups 9; the outer mold is a split structure, and the outer mold includes a left outer module and a right outer module, and the left outer module and the right outer module are spliced into the outer mold as a whole. Specifically, the inner walls of the left and right outer molds are distributed with a groove group consisting of a plurality of triangular grooves, the width of the triangular grooves is 1-2mm, the depth is 1-1.5mm, and the spacing is 2-3mm; the groove group increases the roughness of the inner wall of the outer mold to increase the filling capacity of the aluminum liquid. In addition, the groove 1 in the groove group can accumulate thermal insulation coating to reduce the temperature transfer of the aluminum liquid during filling and increase the filling capacity of the aluminum liquid.
[0045] Preferably, the runner block is installed on the outer mold, and the runner block is higher than the outer mold by a dimension B. The purpose of the runner block being higher than the outer mold is to ensure that when the aluminum liquid flows from the runner into the mold cavity, there is sufficient flow rate to fill the mold, but the value of B cannot be too large, otherwise it will cause large splashes when the aluminum liquid flows into the mold cavity to form casting bubble defects. B is preferably 50-100mm.
[0046] As a preferred embodiment, a vent hole is provided on the top mold, and the vent hole is connected to the inner mold and the sand core for releasing the gas generated during casting to eliminate the air entrapment defect of the casting.
[0047] As a preferred embodiment, the inner hole for installing the sand core sleeve is a polygonal structure hole to prevent the sand core from rotating; preferably, the inner hole adopts a polygonal structure hole with a small top and a large bottom. The number in the polygon is an integer greater than or equal to 3. In this embodiment, the inner hole for installing the sand core is a trapezoidal hole with a small top and a large bottom. The purpose is that the trapezoidal inner hole can prevent the sand core from rotating after installation. The inner hole of the sand core is small at the top and large at the bottom, which can facilitate the installation of the sand core from top to bottom on the inner mold.
[0048] As a preferred embodiment, the inner mold, outer mold and top mold are also provided with cooling water channels; the cooling water channels can be used to adjust the mold temperature, improve the casting quality, and reduce the casting solidification time to improve production efficiency by connecting to the cooling circulation system.
[0049] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A gravity casting mold, characterized in that: include: Top mold, outer mold, sand core, inner mold, positioning sleeve and runner block; The sand core and the positioning sleeve are respectively sleeved and connected to the upper side end and the lower side end of the inner mold; the outer mold is connected to the positioning sleeve near one end of the sand core, wrapping the sand core inside, and a casting mold cavity for molding is provided between the outer mold and the sand core; a gap channel is left between the sand core and the positioning sleeve; The top mold cover is pressed on the top of the sand core, and a first shrinkage feed riser is formed between the top mold and the outer mold; The runner block is arranged at the top of the outer mold, the runner block and the outer mold are provided with a first casting channel connected, and the bottom end of the outer mold is provided with a second casting channel connected to the gap channel and the first casting channel respectively; The gap channel portion is positioned to be provided with a first groove, and the first groove is used as a second shrinkage feeder.
2. The gravity casting mold according to claim 1, characterized in that: The inner wall of the first groove is coated with thermal insulation paint.
3. The gravity casting mold according to claim 1, characterized in that: The first casting channel, the second casting channel and the gap channel are respectively connected to form a connected straight runner, a horizontal runner and an inner runner structure; the included angle between the straight runner and the horizontal runner is an obtuse angle.
4. The gravity casting mold according to claim 1, characterized in that: The inner wall of the outer mold is provided with a plurality of annular groove groups.
5. The gravity casting mold according to any one of claims 1 to 4, characterized in that: The outer mold is a split structure, and the outer mold includes a left outer module and a right outer module, and the left outer module and the right outer module are spliced into an outer mold as a whole.
6. The gravity casting mold according to claim 5, characterized in that: The top mold is provided with an exhaust hole, which is connected to the inner mold and the sand core.
7. The gravity casting mold according to claim 5, characterized in that: The inner mold, outer mold and top mold are also provided with cooling water channels.
8. The gravity casting mold according to any one of claims 1-4, 6-7, characterized in that: The inner hole used for installing the sand core sleeve is a polygonal structure hole to prevent the sand core from rotating.