Core manufacturing device for sand core
By combining the core-making device of split sand cores, the problems of high cost and long cycle in the preparation of ultra-large sand cores in the existing technology have been solved, and ultra-large sand core production with low cost and fast response has been realized.
Patent Information
- Application Number
- CN202520350997.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-03
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2035-03-03
AI Technical Summary
Existing technologies for preparing ultra-large sand cores suffer from high equipment costs, long mold modification cycles, and long production cycles, especially in small-batch production.
A core-making device is used to combine multiple separate sand cores into an ultra-large sand core through a core assembly platform, locking components and sand frame. The separate sand cores are prepared using technologies such as 3D printing and fixed by locking components to form the target sand core.
It enables low-cost preparation of ultra-large sand cores, shortens the production cycle, adapts to rapid response when adjusting processes and casting structures, and reduces change costs and time.
Smart Images
Figure CN223876033U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to foundry technology field, especially relate to a core making device of sand core. BACKGROUND
[0002] In prior art, the demand of super large casting is about 1000 pieces per year, and the annual demand is not large. In the existing casting process, the method for preparing super large sand core includes equipment core making and manual core making. The equipment core making is a super large core making machine used for preparing sand core in casting field. The machine firstly injects mixed resin sand into the cavity of super large sand core mold through air pressure, blows air to solidify, opens the mold to take out the sand core, and then obtains the super large sand core with a weight of about 2 tons. The manual core making is to prepare super large manual core box and fill sand manually. After solidification, the mold is opened to take out the core, and then the super large sand core is obtained.
[0003] The disadvantages of prior art are:
[0004] (1) When the quantity is small, the existing technology needs to prepare super large mold, and the manufacturing cost is high.
[0005] (2) When the process or the structure of casting needs to be adjusted, the mold needs to be modified, the change cycle is long, the cost is high, and the process is complex.
[0006] (3) Because the mold needs to be opened, the development cycle from sand core design to sand core preparation is long. CONTENT OF THE UTILITY MODEL
[0007] Based on the above problems, the utility model aims to provide a core making device of sand core, which can combine multiple split sand cores into a super large sand core and reduce the cost.
[0008] In order to overcome the defects of prior art, the utility model provides the technical scheme:
[0009] A core making device of sand core, comprising:
[0010] A core assembling platform having a support plane for positioning and supporting multiple split sand cores to be combined;
[0011] A first locking assembly for locking multiple split sand cores to be combined in vertical direction;
[0012] A second locking assembly for locking multiple split sand cores to be combined in horizontal direction;
[0013] A sand frame arranged at the outer periphery of all split sand cores to be combined for accommodating self-hardening sand and all split sand cores to be combined, so that all split sand cores to be combined form a target sand core.
[0014] In one embodiment, the core assembling platform comprises a bottom plate, and a sand frame positioning assembly and a sand core guiding and forming assembly arranged on the bottom plate.
[0015] In one of the embodiments, the sand frame positioning assembly comprises a plurality of positioning members arranged circumferentially and vertically on the base plate, and the inner side of the sand frame abuts against the plurality of positioning members.
[0016] In one of the embodiments, the positioning member is L-shaped.
[0017] In one of the embodiments, the sand core guiding forming assembly comprises a plurality of first forming members for forming rough positioning holes, a plurality of second forming members for forming fine positioning holes, and a plurality of positioning blocks for fastening the sand core and the base plate, the first forming members and the second forming members are arranged on the outer periphery of the split sand core, and the plurality of positioning blocks extend into the split sand core at the bottom.
[0018] In one of the embodiments, the first locking assembly comprises a plurality of first screw rods arranged vertically and locked with the split sand core at the bottom through nuts, and a plurality of pressing plates connected with the adjacent first screw rods and abutting against the split sand core above.
[0019] In one of the embodiments, the first screw rod is locked with the pressing plate through nuts.
[0020] In one of the embodiments, the second locking assembly comprises a plurality of second screw rods arranged horizontally, and the second screw rods are locked with the split sand core in the horizontal direction through nuts.
[0021] In one of the embodiments, the sand frame comprises two side plates arranged oppositely, two inner plates connected with the two side plates, and a plurality of cross beams connected with the two side plates and having a spacing with the core assembly platform, and the pressing plates arranged along the extension direction of the side plates abut against the upper ends of the cross beams.
[0022] In one of the embodiments, a plurality of positioning holes are arranged on the side plates, and the two ends of the inner plates are detachably connected with the side plates through the positioning holes.
[0023] Compared with the prior art, the utility model has the advantages of:
[0024] 1. A plurality of small split sand cores can be combined into a super-large sand core, which is suitable for the preparation of small-batch super-large sand cores, does not need to open a mold, has low cost, and has a short sand core preparation period.
[0025] 2. When the process and the structure of the casting are adjusted, only the 3D data or the simple mold needs to be changed, the changing process is simple and convenient, the changing period is short, and the cost is low. BRIEF DESCRIPTION OF DRAWINGS
[0026] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows, and the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the premise of the drawings.
[0027] Figure 1 A quarter of the core making device embodiment of the present application is a quarter of the core making device embodiment of the present application.
[0028] Figure 2 The structure diagram of the core making platform in the embodiment of the present application is shown.
[0029] Figure 3 The structure diagram of the sand frame in the embodiment of the present application is shown.
[0030] Among them:
[0031] 1, core making platform; 1-1, bottom plate; 1-2, positioning part; 1-3, first forming part; 1-4, second forming part; 1-5, positioning block; 1-6, direction mark;
[0032] 2, first locking assembly; 2-1, first screw; 2-2, pressing plate; 2-3, nut; 2-4, gasket;
[0033] 3, second screw;
[0034] 4, sand frame; 4-1, side plate; 4-1a, positioning hole; 4-2, inner plate; 4-3, cross beam;
[0035] 5, split sand core. DETAILED DESCRIPTION
[0036] The above scheme will be further described in combination with specific embodiments. It should be understood that these embodiments are used to illustrate the present application and do not limit the scope of the present application. The implementation conditions used in the embodiments can be further adjusted according to the specific conditions of the manufacturer, and the implementation conditions not marked are usually the conditions in the conventional experiment.
[0037] Referring to Figure 1 , the structure diagram of the embodiment of the present application is shown, and a core making device for sand core is provided, which comprises a core assembling platform 1, a first locking assembly 2, a second locking assembly 3 and a sand frame 4.
[0038] As Figure 2 shown, the core assembling platform 1 has a supporting plane for positioning and supporting a plurality of split sand cores 5 to be combined, which comprises a bottom plate 1-1, and a sand frame positioning assembly and a sand core guiding and forming assembly arranged on the bottom plate 1-1. Among them, the bottom plate 1-1 is in the form of a rectangular plate.
[0039] In order to facilitate the judgment of the direction of the sand core assembly, a direction mark 1-6 is arranged on the bottom plate 1-1 for identifying the four directions of up, down, left and right.
[0040] The sand frame positioning assembly comprises a plurality of positioning members 1-2 arranged circumferentially on the bottom plate 1-1 and in the vertical direction, the inner side of the sand frame 4 abuts against the plurality of positioning members 1-2, in this example, the number of the positioning members 1-2 is four, and they are arranged at the four corners of the rectangle, each positioning member 1-2 is in the shape of L to ensure the strength of the structure.
[0041] The sand core guiding forming assembly comprises a plurality of first forming members 1-3 for forming the coarse positioning holes, a plurality of second forming members 1-4 for forming the fine positioning holes, and a plurality of positioning blocks 1-5 for connecting the sand core and the bottom plate 1-1. Among them, the first forming members 1-3 and the second forming members 1-4 are arranged on the outer periphery of the plurality of split sand cores 5 to be combined, and the plurality of positioning blocks 1-5 extend into the split sand core 5 at the bottom, the positioning of the split sand core on the bottom plate 1-1 is realized through the positioning blocks 1-5, the coarse positioning holes and the fine positioning holes for guiding the assembly of the target sand cores are formed on the target sand cores through the first forming members 1-3 and the second forming members 1-4, and the positioning pins are arranged in the coarse positioning holes and the fine positioning holes for positioning when the target sand cores (oversized sand cores) are assembled into a box.
[0042] The first forming members 1-3 are in the shape of long rod, the number is four, and they are arranged at the four corners of the rectangle. The second forming members 1-4 are in the shape of short rod, the number is two, and they are arranged on the opposite sides of the rectangle, and each second forming member 1-4 is arranged between two first forming members 1-3. The positioning blocks 1-5 are in the shape of cylinder, cuboid or other shapes. The first forming members 1-3, the second forming members 1-4 and the positioning blocks 1-5 are fixed on the bottom plate 1-1 through screws to ensure the stability of the structure.
[0043] The first locking assembly comprises a plurality of first screws 2-1 and a plurality of pressing plates 2-2, the first screws 2-1 are arranged in the vertical direction and are locked with the split sand core 5 at the bottom through nuts, and the pressing plates 2-2 are connected with the adjacent plurality of first screws 2-1 and abut against the split sand core 5 above. Specifically, the nuts are prefabricated in the split sand core 5 at the bottom, the first screws 2-1 pass through the plurality of split sand cores 5 in the vertical direction and are threadedly connected with the nuts at the bottom, the first screws 2-1 are locked with the pressing plates 2-2 through the nuts 2-3 above, and the gaskets 2-4 are arranged between the nuts 2-3 and the pressing plates 2-2 to improve the stability of the structure.
[0044] The second locking assembly comprises a plurality of second screws 3 arranged in the horizontal direction, the second screws 3 are locked with the plurality of split sand cores 5 in the horizontal direction through nuts, and specifically, the second screws 3 pass through the plurality of split sand cores 5 in the horizontal direction, and the two ends of the second screws 3 are locked with the split sand cores 5 through nuts.
[0045] As Figure 3 shown, the sand frame 4 includes two oppositely arranged side plates 4-1, two inner plates 4-2 connecting the two side plates 4-1, and a plurality of cross beams 4-3 connecting the two side plates 4-1 and having a spacing between the bottom plate 1-1. The pressing plate 2-2 arranged along the extension direction of the side plate 4-1 abuts against the upper end of the cross beam 4-3. Through the cooperation of the cross beam 4-3 and the pressing plate 2-2, the stability of the combined sand core structure is improved, the strength of the sand core is increased, and the cracking during hoisting is prevented.
[0046] In order to adapt to different sizes of target sand cores, a plurality of positioning holes 4-1a are provided on the side plate 4-1, and the two ends of the inner plate 4-2 are detachably connected with the side plate 4-1 through each group of positioning holes 4-1a.
[0047] The core assembling method of the core assembling device comprises the following steps:
[0048] S1: structural design, dividing the target sand core into a plurality of split sand cores which are easy to prepare;
[0049] S2: preparing the split sand cores;
[0050] S3: preparing the core making platform, and setting the sand frame positioning assembly and the sand core guiding and forming assembly on the core making platform according to the size of the target sand core;
[0051] S4: positioning the plurality of split sand cores after being combined on the core making platform to form a pre-assembled core;
[0052] S5: placing the sand frame on the core making platform through the sand frame positioning assembly and locating the sand frame at the outer periphery of the pre-assembled core;
[0053] S6: locking the plurality of split sand cores in the vertical direction through the first locking assembly, locking the plurality of split sand cores in the horizontal direction through the second locking assembly, and fixing the pre-assembled core and the sand frame;
[0054] S7: plugging the cavities of the split sand cores, and filling the self-hardening sand between the pre-assembled core and the sand frame;
[0055] S8: after the self-hardening sand is cured, the mold is removed to obtain the target sand core.
[0056] In step S2, the split sand cores are prepared by 3D printing sand cores, subtractive core making or equal material core making. The split sand cores are provided with structures such as clamping blocks and clamping grooves which are fixed to each other, and the end surface of the split sand core in contact with the self-hardening sand is provided with an undercut structure to facilitate combination with the self-hardening sand. The undercut structure is tapered from the direction away from the split sand core to the direction close to the split sand core.
[0057] In step S3, the bottom plate of the core making platform is a square of 4000mmx4000mm, and the flatness requirement is ≤1mm.
[0058] The gap between the sand frame and the pre-assembled core in step S5 is 20-100mm.
[0059] The gap between the sand frame and the pre-assembled core in step S5 is 20-100mm.
[0060] The filling of the self-hardening sand is completed within 2h in step S7.
[0061] In summary, the core assembly device can combine multiple split sand cores into an oversized sand core, without opening the mold, thereby reducing cost, shortening the production cycle, and improving production efficiency.
[0062] The above examples are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and it cannot limit the protection scope of the present application. Any equivalent transformation or modification made according to the spirit and essence of the present application should be covered within the protection scope of the present application.
Claims
1. A core-making apparatus for sand cores, characterized in that, include: The core assembly platform has a supporting plane for positioning and supporting multiple separate sand cores to be assembled; The first locking assembly is used to lock the multiple split sand cores to be assembled in the vertical direction; The second locking assembly is used to lock the multiple split sand cores to be assembled in the horizontal direction; A sand frame is set on the outer periphery of all the separate sand cores to be assembled, and is used to contain the self-hardening sand and all the separate sand cores to be assembled, so that all the separate sand cores to be assembled form the target sand core.
2. The core-making apparatus for sand cores according to claim 1, characterized in that: The core assembly platform includes a base plate, and a sand frame positioning component and a sand core guiding and forming component disposed on the base plate.
3. The core-making apparatus for sand cores according to claim 2, characterized in that: The sand frame positioning assembly includes a plurality of positioning elements disposed on the circumference of the base plate and arranged in the vertical direction, and the inner side of the sand frame abuts against the plurality of positioning elements.
4. The core-making apparatus for sand cores according to claim 3, characterized in that: The positioning element is L-shaped.
5. The core-making apparatus for sand cores according to claim 2, characterized in that: The sand core guiding and forming assembly includes a plurality of first forming parts for forming coarse positioning holes, a plurality of second forming parts for forming fine positioning holes, and a plurality of positioning blocks connecting the sand core and the base plate, located on the inner periphery of the sand frame positioning assembly. The first forming parts and the second forming parts are arranged on the outer periphery of the plurality of split sand cores, and the plurality of positioning blocks extend into the split sand core located at the bottom.
6. The core-making apparatus for sand cores according to claim 1, characterized in that: The first locking assembly includes a plurality of first screws and a plurality of pressure plates. The first screws are arranged vertically and locked to the split sand core located at the bottom by nuts. The pressure plates are connected to the adjacent plurality of first screws and abut against the split sand core located above.
7. The core-making apparatus for sand cores according to claim 6, characterized in that: The first screw is locked to the pressure plate by a nut.
8. The core-making apparatus for sand cores according to claim 6, characterized in that: The second locking assembly includes a plurality of second screws arranged in a horizontal direction, which are locked to a plurality of split sand cores located in the horizontal direction by nuts.
9. The core-making apparatus for sand cores according to claim 6, characterized in that: The sand frame includes two side plates arranged opposite each other, two inner plates connecting the two side plates, and multiple crossbeams connecting the two side plates and having a distance between them and the core assembly platform. A pressure plate arranged along the extension direction of the side plates abuts against the upper end of the crossbeams.
10. The core-making apparatus according to claim 9, characterized in that: The side plate is provided with multiple sets of positioning holes, and the two ends of the inner plate are detachably connected to the side plate through the positioning holes.