Core clamping tool

Abstract

The core clamping tool comprises an upper sleeve, a lower sleeve, a rod and a nut, hollow structures are arranged inside the upper sleeve and the lower sleeve, large-end structures and small-end structures are arranged outside the upper sleeve and the lower sleeve, and the large-end structures and the small-end structures are in smooth transition; the first sand core is provided with a first through hole in clearance fit with the upper sleeve, and the upper sleeve is arranged in the first through hole; the second sand core is provided with a second through hole in clearance fit with the lower sleeve, and the lower sleeve is arranged in the second through hole; the small end structure of the upper sleeve is opposite to the small end structure of the lower sleeve; threaded sections are arranged at the two ends of the rod, and the rod penetrates through the hollow structures of the upper sleeve and the lower sleeve and is fastened through nuts. According to the core clamping tool disclosed by the utility model, through the structural characteristics of the upper sleeve and the lower sleeve, local stress which originally acts on a sand core and is generated by clamping a nut is transferred to the tool, and the stress generated by clamping is transferred, so that the tendency that the sand core is cracked due to stress is prevented, and the quality of a 3D printing sand core bare casting product is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of casting, in particular to a core clamping tool for connecting a plurality of sand cores. Background Art

[0002] When 3D printing sand cores are cast bare, the sand cores are usually connected by a screw card box, that is, a screw hole is opened on the sand core body, the sand cores are connected in series through the screw and the screw hole, and then nuts are tightened at the two ends of the screw to finally realize the screw card box.

[0003] In actual production, if the casting weight of the casting produced by 3D printed sand core exceeds 1 ton, the naked casting method using a screw clamping box will cause the iron liquid in the mold cavity to expand after the casting core is poured, causing the force at the screw hole position and the screw clamping point of the sand core to gradually increase. The clamping position is pressed to crack by the force transmitted by the nut because the strength of the sand core itself is lower than that of the nut, which eventually causes cracks to appear in the sand core starting from the nut, and even gradually extending to the entire sand core, causing fire in the casting.

[0004] In the prior art, the cracking of the sand core is usually solved by increasing the sand intake of the sand core or burying the sand core in a box. However, both methods will cause the sand-iron ratio of the sand core to exceed the standard, reduce production efficiency and increase production costs. Utility Model Content

[0005] Based on this, it is necessary to provide a core clamping tool for connecting multiple sand cores to address the above technical problems.

[0006] In order to solve the above problems, the utility model adopts the following technical solutions:

[0007] The utility model embodiment discloses a core tooling, including an upper sleeve, a lower sleeve, a rod and a nut, the upper sleeve and the lower sleeve are both provided with a hollow structure inside, and are both provided with a large end structure and a small end structure outside, and the large end structure and the small end structure have a smooth transition; a first sand core is provided with a first through hole, the upper sleeve is provided in the first through hole and is gap-matched with the first through hole; the second sand core is provided with a second through hole, the lower sleeve is provided in the second through hole and is gap-matched with the second through hole; the small end structure of the upper sleeve is arranged opposite to the small end structure of the lower sleeve; threaded sections are provided at both ends of the rod, and the rod passes through the hollow structures of the upper and lower sleeves and is fastened by the nut.

[0008] In one of the embodiments, a third sand core is arranged between the first sand core and the second sand core, the third sand core is provided with a third through hole, a middle sleeve is arranged in the third through hole and is gap-matched with the third through hole, one end of the middle sleeve is matched with the small end structure of the upper sleeve, and the other end is matched with the small end structure of the lower sleeve, and a hollow structure for the rod to pass through is also arranged in the middle sleeve.

[0009] In one embodiment, a positioning component is provided at the joints between the upper sleeve, the middle sleeve and the lower sleeve.

[0010] In one embodiment, the upper sleeve and / or the lower sleeve is a tubular structure with a gradually changing outer diameter.

[0011] In one embodiment, the upper sleeve and / or the lower sleeve is provided with a groove for accommodating the nut.

[0012] In one embodiment, a gasket is provided between the nut and the upper sleeve / the lower sleeve.

[0013] In one embodiment, the card core tooling is made of metal.

[0014] In one embodiment, the first sand core and the second sand core are connected by a plurality of any of the core clamping tools described above.

[0015] The technical solution adopted by the utility model can achieve the following beneficial effects:

[0016] The core clamping tool disclosed by the utility model transfers the local stress originally acting on the sand core caused by the clamping of the nut to the tooling through the smooth transition variable diameter structure characteristics of the upper and lower sleeves. By transferring the stress generated by the clamping, the tendency of cracks caused by the local force on the sand core is prevented, thereby effectively improving the quality of 3D printed sand core bare casting products and reducing the risk of defects such as fire leakage.

[0017] The core clamping tool disclosed by the utility model has a simple structure, ingenious design and is easy to use. It can connect and fasten the sand cores without increasing the sand consumption of the sand cores or burying the sand cores, effectively reducing the casting sand-iron ratio, improving the effectiveness efficiency and reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the card core tooling disclosed in the embodiment of the utility model;

[0019] Figure 2 for Figure 1 A partial enlarged view of part A;

[0020] Figure 3 for Figure 1 A partial enlarged view of part B;

[0021] Figure 4 is a schematic diagram of the structure of an optional ground cover;

[0022] Figure 5 is a schematic diagram of the structure of another optional set;

[0023] Figure 6 is a schematic diagram of the structure of another optional set;

[0024] Description of reference numerals:

[0025] 110 - first sand core, 111 - first through hole, 120 - second sand core, 121 - second through hole;

[0026] 200-card core tooling, 211-upper sleeve, 212-middle sleeve, 213-lower sleeve, 220-rod, 230-nut. DETAILED DESCRIPTION

[0027] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the relevant drawings. The drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.

[0028] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a centered element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a centered element at the same time. The terms "vertical", "horizontal", "left", "right", "top", "bottom", "bottom end", "top end" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0030] The utility model embodiment discloses a card core tooling, such as Figures 1 to 4As shown, the disclosed core fixture 200 is used to firmly connect the first sand core 110 and the second sand core 120. The first sand core 110 may be provided with a first through hole 111, and the second sand core 120 may be provided with a second through hole 121. Preferably, the first through hole 111 and the second through hole 121 may be coaxially arranged. The core fixture 200 connects the first sand core 110 and the second sand core 120 through the first through hole 111 and the second through hole 121. The core fixture 200 may include a sleeve, a rod 220 and a nut 230, the sleeve is lined in the first through hole 111 and the second through hole 121, and is used to protect the first sand core 110 and the second sand core 120; both ends of the rod 220 are provided with threaded sections, the rod 220 passes through the sleeve and is fastened with nuts 230 at both ends.

[0031] Specifically, the sleeve may include an upper sleeve 211 and a lower sleeve 213, wherein the upper sleeve 211 is lined in the first through hole 111, and the lower sleeve 213 is lined in the second through hole 121. The upper sleeve 211 is a variable diameter tubular structure with a large outer diameter at one end and a small outer diameter at the other end, and a smooth transition at both ends. Similarly, the lower sleeve 213 is also a variable diameter tubular structure with a large outer diameter at one end and a small outer diameter at the other end, and a smooth transition at both ends. Of course, in order to facilitate the upper sleeve 211 to be lined in the first through hole 111, the first through hole 111 is a variable diameter structure matching the upper sleeve 211 and the two are clearance-matched; in order to facilitate the lower sleeve 213 to be lined in the second through hole 121, the second through hole 121 is a variable diameter structure matching the lower sleeve 213 and the two are clearance-matched. The first through hole 111 and the second through hole 121 are arranged in a way that the small hole ends face each other and the large hole ends face back to back, and the upper sleeve 211 and the lower sleeve 213 are also arranged in a way that the ends with small outer diameters face each other and the ends with large outer diameters face back to back. The rod 220 passes through the upper sleeve 211 and the lower sleeve 213 in sequence, and is fastened with nuts 230 at both ends. The sleeves are fixed in the first through hole 111 and the second through hole 121 by the threaded limit between the nut 230 and the rod 220, and a stable connection between the first sand core 110 and the second sand core 120 is achieved.

[0032] In this embodiment, the first through hole 111 and / or the second through hole 121 can be directly brought out during the sand core 3D printing process without having to be made separately.

[0033] It should be noted that the nut 230 does not contact the upper sleeve 211, but directly applies force to the upper sleeve 211, which then transmits the tightening force to the diameter change of the first through hole 111, and the tightening force is shared by the diameter change as a whole, effectively preventing the tendency of cracks to appear due to local stress on the sand core, effectively improving the quality of 3D printed sand core bare casting products, and reducing the risk of defects such as fire. Similarly, the nut 230 does not contact the lower sleeve 213, but directly applies force to the lower sleeve 213, which then transmits the tightening force to the diameter change of the second through hole 121, and the tightening force is shared by the diameter change as a whole.

[0034] In an optional embodiment disclosed in the present utility model, Figure 5 As shown, in addition to being provided with a diameter-changing portion, the upper sleeve 211 and / or the lower sleeve 213 is also provided with a non-diameter-changing portion, and the non-diameter-changing portion includes a straight tube-shaped large end structure and a straight tube-shaped small end structure, and the large end structure and the small end structure have a smooth transition. Correspondingly, the first through hole 111 and / or the second through hole 121 also include a diameter-changing portion and a non-diameter-changing portion that match the upper sleeve 211 and / or the lower sleeve 213. The tightening force applied by the nut 230 is transmitted by the upper sleeve 211 and / or the lower sleeve 213 and shared at the diameter-changing portion. The remaining settings of this embodiment may be the same as those of the above-mentioned embodiment, and this embodiment will not be repeated.

[0035] In another optional embodiment disclosed in the utility model, in actual production, it is necessary not only to connect the first sand core 110 and the second sand core 120, but also to set a third sand core between the first sand core 110 and the second sand core 120. The third sand core may be provided with a third through hole, which is preferably coaxially arranged with the first through hole 111 and / or the second through hole 121. The rod 220 passes through the first through hole 111, the third through hole, and the second through hole 121 in sequence, and is fastened at both ends by nuts 230 to achieve a stable series connection of the first sand core 110, the third sand core, and the second sand core 120.

[0036] Further, such as Figure 6 As shown, the sleeve may also include an upper sleeve 211, a middle sleeve 212 and a lower sleeve 213. One end of the middle sleeve 212 may be butted with the small end of the upper sleeve 211, and the other end may be butted with the small end of the lower sleeve 213. The middle sleeve 212 is also provided with a hollow structure for the rod 220 to pass through. The upper sleeve 211 is lined in the first through hole 111, the lower sleeve 213 is lined in the second through hole 121, and the middle sleeve 212 is lined in the third through hole.

[0037] Furthermore, there may be multiple third sand cores, and correspondingly, there may also be multiple middle sleeves 212 .

[0038] It should be noted that the remaining settings in this embodiment may be the same as those in the above embodiment, and will not be described in detail in this embodiment.

[0039] In the embodiment disclosed in the utility model, the butt joints between the components of the sleeve may be provided with positioning components, and the positioning components may be concave and convex structures that match each other.

[0040] In the embodiment disclosed in the utility model, in order to prevent the core fixture 200 from exposing the first sand core 110 and thus affecting the placement of the first sand core 110, the upper sleeve 211 is provided with a groove for accommodating the nut 230 and the end of the rod 220. Of course, in order to prevent the core fixture 200 from exposing the second sand core 120 and thus affecting the placement of the second sand core 120, the lower sleeve 213 may also be provided with a groove for accommodating the nut 230 and the end of the rod 220.

[0041] Further, a washer may be provided at the inner end of the nut 230 .

[0042] In the embodiment disclosed in the utility model, the card core tool 200 can be made of metal material so as to be recycled and reused. Preferably, the card core tool 200 can be made of steel, which has excellent mechanical properties and corrosion resistance, and improves its service life.

[0043] In the embodiment disclosed in the present invention, the first sand core 110 and the second sand core 120 can be connected by a plurality of core fixtures 200. Preferably, the core fixtures 200 are symmetrically arranged at intervals along the circumference of the first sand core 110 and / or the second sand core 120.

[0044] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A card core tooling, characterized in that: It comprises an upper sleeve, a lower sleeve, a rod and a nut, wherein the upper sleeve and the lower sleeve are both provided with a hollow structure inside, and are both provided with a large end structure and a small end structure outside, and the large end structure and the small end structure have a smooth transition; The first sand core is provided with a first through hole, the upper sleeve is provided in the first through hole and is in gap fit with the first through hole; the second sand core is provided with a second through hole, the lower sleeve is provided in the second through hole and is in gap fit with the second through hole; the small end structure of the upper sleeve is arranged opposite to the small end structure of the lower sleeve; Both ends of the rod are provided with threaded sections, and the rod passes through the hollow structures of the upper and lower sleeves and is fastened by the nut.

2. The card core tooling according to claim 1, characterized in that: A third sand core is arranged between the first sand core and the second sand core, and the third sand core is provided with a third through hole. A middle sleeve is arranged in the third through hole and is gap-matched with the third through hole. One end of the middle sleeve is matched with the small end structure of the upper sleeve, and the other end is matched with the small end structure of the lower sleeve. A hollow structure for the rod to pass through is also arranged in the middle sleeve.

3. The card core tooling according to claim 2, characterized in that: A positioning component is arranged at the butt joints among the upper sleeve, the middle sleeve and the lower sleeve.

4. The card core tooling according to claim 1, characterized in that: The upper sleeve and / or the lower sleeve is a tubular structure with a gradually changing outer diameter.

5. The card core tooling according to claim 1, characterized in that: The upper sleeve and / or the lower sleeve is provided with a groove for accommodating the nut.

6. The card core tooling according to claim 1, characterized in that: A gasket is arranged between the nut and the upper sleeve / the lower sleeve.

7. The card core tooling according to claim 1, characterized in that: The card core tooling is made of metal.

8. The card core tooling according to any one of claims 1 to 7, characterized in that: The first sand core and the second sand core are connected by a plurality of the core clamping tools.

Images