Fixing method for 3D printing sand core top face chilling block

Abstract

The invention relates to a method for fixing a chilling block on the top surface of a 3D printing sand core, which comprises the following steps: manufacturing the sand core: before manufacturing the sand core, sequentially presetting a magnet support cavity, a magnet cavity and a chilling block cavity on the sand core from top to bottom, and then manufacturing the sand core; fixing a magnet, assembling the magnet on a magnet support, and placing the magnet into a preset magnet support cavity and a magnet cavity of the sand core; gluing: uniformly smearing casting glue on the side surface and the top surface of the chilling block; the chilling block is fixed, and the glued chilling block is placed in the chilling block cavity to make contact with the magnet and be attracted to the magnet; and the magnet is taken out, and after the casting glue smeared on the outer portion of the chilling block is completely dried, the magnet support and the magnet are taken out from the top of the sand core. The device has the advantages of being stable in installation, high in safety, easy to operate, high in efficiency, capable of improving the casting quality and convenient to operate on site.

Description

Technical Field

[0001] The invention relates to a method for fixing a chiller, and in particular to a method for fixing a chiller on the top surface of a 3D printing sand core. Background Art

[0002] With the rapid development of the industrial process and the continuous iteration and updating of technology, the application of 3D printing technology in the casting field has gradually increased. 3D printed sand cores have the advantages of high dimensional accuracy and good surface quality. Especially for some castings with complex shapes and structures, 3D printing is more convenient and solves the problem of manual compaction. Therefore, the application of 3D printing technology is becoming more and more extensive.

[0003] Normally, 3D printed sand cores are usually equipped with some chillers. When the chillers are on the bottom and sides of the sand core, you only need to print out the corresponding chiller grooves, apply glue to the chillers and put them in. The chillers generally do not move.

[0004] When the chiller needs to be placed on the top surface, there are some technical problems. The chiller cannot be directly glued and placed on the top surface. This is mainly because the chiller itself has a relatively large gravity, and the glue applied has no strength temporarily, so the chiller will fall off directly. The chiller fixing method used in the prior art is mainly to directly drill a chiller hole from the top and weld a steel rod to hang the chiller from the chiller hole on the top of the 3D sand core. After the chiller is recovered and used again, the steel rod needs to be removed to prevent the steel plate from scratching the belt during shot blasting. This chiller fixing method has the defects of complex operation, low efficiency and low safety, and needs to be improved and upgraded. Summary of the invention

[0005] Based on this, it is necessary to provide a method for fixing the cold iron on the top surface of 3D printed sand cores to address the problem that the cold iron on the top surface of 3D printed sand cores is difficult to fix, so as to effectively avoid the problems of easy falling off of the cold iron on the top surface, low safety, complicated operation and low efficiency.

[0006] A method for fixing a chill on the top surface of a 3D printed sand core, characterized in that the fixing method comprises:

[0007] Sand core production: before the sand core is produced, a magnet support cavity, a magnet cavity and a chiller cavity are sequentially preset on the sand core from top to bottom, and then the sand core is produced;

[0008] Magnet fixing: After assembling the magnet on the magnet support, place the magnet into the magnet support cavity and the magnet cavity preset in the sand core;

[0009] Glue application: Apply casting glue evenly on the side and top surface of the chill;

[0010] Chilled iron fixing: placing the glue-coated chilled iron into the chilled iron cavity, contacting and adsorbing the magnet;

[0011] Taking out the magnet: after the casting glue coated on the outside of the chill is completely dry, the magnet bracket and the magnet are taken out from the top of the sand core.

[0012] In one embodiment, the magnet bracket includes a screw rod and a positioning ring, and a thread is provided in the middle of the positioning ring, which is fastened to the screw rod through the thread.

[0013] In one of the embodiments, a plug is provided at one end of the screw.

[0014] In one of the embodiments, in the gluing step, the coating position on the top surface of the cold iron is 10mm-20mm from the outer circle.

[0015] In one of the embodiments, in the chill fixing step, the glue-coated chill is pushed upward from the lower end of the sand core into the chill cavity.

[0016] In one of the embodiments, a threaded hole is provided in the middle of the magnet.

[0017] In one of the embodiments, a gap is left between the cold iron cavity and the cold iron.

[0018] In one of the embodiments, a gap is left between the magnet support cavity and the magnet support.

[0019] In one of the embodiments, a gap is left between the magnet cavity and the magnet.

[0020] In one embodiment, the chiller is magnetic.

[0021] The technical solution adopted by the present invention can achieve the following beneficial effects:

[0022] The present invention discloses a method for fixing the cold iron on the top surface of a 3D printed sand core. The magnet is set in the magnet cavity by a simple magnet bracket, and the effect of the strong magnet is fully utilized to directly absorb the cold iron after applying the glue. After the glue is dried, the magnet bracket and the magnet are removed, which effectively replaces the method of using the cold iron to weld the steel rod support in the prior art. Therefore, the technical solution has the advantages of simple operation, high safety, easy on-site operation and reduced risk of sand inclusion in castings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a diagram of the magnet bracket and magnet structure;

[0024] Figure 2 This is a schematic diagram of the cold iron fixing on the top surface of the sand core;

[0025] Figure 3 Schematic diagram of the glue application position on the top surface of the chiller.

[0026] Description of reference numerals:

[0027] 1-screw, 2-positioning ring, 3-magnet, 4-chill, 5-sand core, 6-glue coating position. DETAILED DESCRIPTION

[0028] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. 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 understood.

[0029] 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.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art 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.

[0031] An embodiment of the present invention discloses a method for fixing a cold iron on the top surface of a 3D printed sand core. In the embodiment of the present invention, the cold iron is fixed to the top surface of the 3D printed sand core by a magnet. The cold iron fixing method includes: sand core production, magnet fixing, gluing, cold iron fixing and removing the magnet.

[0032] like Figure 1As shown, in the embodiment of the present invention, the tooling used to fix the cold iron includes a magnet bracket and a magnet 3. Specifically, the magnet bracket includes a screw 1 and a positioning ring 2. A thread is provided in the middle of the positioning ring 2. The positioning ring 2 is fastened together by cooperating with the thread on the screw 1, and the position of the positioning ring 2 on the screw 1 can be adjusted by rotating the positioning ring 2. A plug is also provided at one end of the screw 1. A threaded hole is provided in the middle of the magnet 3. The screw 1 passes through the magnet 3 and is fastened together by cooperating with the threaded hole in the middle of the magnet 3. The screw 1 has One end of the plug is below the magnet 3, so that the magnet 3 is fastened to the screw 1 to prevent the magnet 3 from slipping during operation and ensure stability; specifically, the assembly process of the magnet 3 and the magnet bracket is as follows: one end of the screw 1 with the plug is at the bottom, and the end without the plug passes through the threaded hole in the middle of the magnet 3 from bottom to top until the plug and the magnet 3 are tightly assembled, and the positioning ring 2 is installed on the screw 1 from top to bottom from the end of the screw 1 without the plug, and is set above the magnet 3. The specific position is adjusted according to the design size of the 3D printing sand core.

[0033] Sand core production: Figure 2 As shown, in order to place the magnet holder and the magnet 3 into the sand core 5, before the sand core 5 is made, the magnet holder cavity, the magnet cavity and the chiller cavity are preset in sequence from top to bottom on the sand core 5, a printed drawing is drawn, and then the sand core is made. Further, the sand core 3 with the preset cavity is made by 3D printing; specifically, during the design, the circumferential size of the magnet holder cavity is larger than the circumferential size of the magnet holder, the circumferential size of the magnet cavity is larger than the circumferential size of the magnet 3, the circumferential size of the chiller cavity is larger than the circumferential size of the chiller 4, and a gap is left between each cavity and the tooling, so that the magnet holder and the magnet 3 can be taken out of the sand core 5 without damaging the sand core 5.

[0034] Further, the cross-section of the magnet support cavity is larger than the cross-section of the magnet cavity, and the magnet support cavity and the magnet cavity are interconnected, specifically a convex shape that is flipped up and down.

[0035] Further, the cold iron cavity and the magnet cavity are interconnected.

[0036] Magnet fixing: The magnet bracket includes a screw 1 with a plug at one end and a positioning ring 2. The magnet 3 is a strong magnet with a threaded hole matched with the screw 1 in the middle. The screw 1 passes through the threaded hole in the middle of the magnet 3 and is fastened to the magnet 3. One end of the screw 1 has a plug. During assembly, the end of the screw 1 without the plug is inserted from the threaded hole in the middle of the magnet 3 until the plug at one end of the screw 1 is fastened and assembled with the magnet 3. The positioning ring 2 is installed on the screw 1 from top to bottom from the end of the screw 1 without the plug, and is fastened above the magnet 3. The specific position is adjusted in height according to the design size of the sand core 3D printing sand core; then the assembled magnet bracket and magnet 3 are placed in the above-mentioned sand core production step, the magnet bracket cavity and the magnet cavity preset in the sand core 5, and the magnet fixing is completed. Specifically, the positioning ring 2 is stuck on the positioning platform formed at the connection between the two cavities, which can prevent the risk of the magnet bracket and the magnet 3 slipping when the subsequent cold iron 4 is fixed, thereby ensuring stability and safety during work.

[0037] Glue application: evenly apply casting glue on the side and top surface of the cold iron 4, specifically, Figure 3 As shown, the location where the glue is applied to the top surface of the cold iron 4 for casting is 10mm-20mm from the outer ring.

[0038] Chilled iron fixing: It can be seen from the sand core making steps that the magnet bracket cavity, the magnet cavity and the chilled iron cavity are arranged in sequence from top to bottom in the sand core 5 and are interconnected. The installation of the magnet 3 is completed in the magnet fixing step. At this time, the magnet 3 is located at the connecting point between the chilled iron cavity and the magnet cavity; then, the chilled iron 4 evenly coated with casting glue is pushed upward from the lower end of the sand core 5 into the chilled iron cavity until the top surface of the chilled iron contacts the magnet 3 and is tightly adsorbed.

[0039] Remove the magnet: After the casting glue applied on the side and top surfaces of the chill 4 is completely dry, remove the screw 1, the positioning ring 2 and the magnet 3 from the top of the sand core 5. At this time, the chill 4 is fastened to the top surface of the sand core by the dried casting glue, completing the fixation of the chill on the top surface of the 3D printed sand core.

[0040] The method for fixing the chiller on the top surface of a 3D printed sand core disclosed in the present invention presets a cavity when 3D printing the sand core, fully utilizes the effect of a strong magnet, fixes the chiller on the top surface of the sand core after applying glue, and after the glue is dry, removes the magnet and the bracket to complete the fixing of the chiller on the top surface of the sand core. The present invention fastens the chiller on the top surface of the sand core through the dual effects of magnetic force and casting glue, effectively replacing the method of supporting by welding a steel plate with a chiller in the prior art. Compared with the prior art, the method has the advantages of simple operation, high safety, convenience for on-site operation, reduced quality risk, and reduced risk of sand inclusion caused by improper placement of the chiller.

[0041] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for fixing a cold iron on the top surface of a 3D printed sand core, characterized in that: The fixing method comprises: Sand core production: before the sand core is produced, a magnet support cavity, a magnet cavity and a chiller cavity are sequentially preset on the sand core from top to bottom, and then the sand core is produced; Magnet fixing: After assembling the magnet on the magnet support, place the magnet into the magnet support cavity and the magnet cavity preset in the sand core; Glue application: Apply casting glue evenly on the side and top surface of the chill; Chilled iron fixing: placing the glue-coated chilled iron into the chilled iron cavity, contacting and adsorbing the magnet; Taking out the magnet: after the casting glue coated on the outside of the chill is completely dry, the magnet bracket and the magnet are taken out from the top of the sand core.

2. The method for fixing the chiller on the top surface of the 3D printing sand core according to claim 1, characterized in that: The magnet bracket comprises a screw rod and a positioning ring, wherein a thread is arranged in the middle of the positioning ring and the positioning ring is fastened to the screw rod through the thread.

3. The method for fixing the chiller on the top surface of the 3D printing sand core according to claim 2, characterized in that: One end of the screw is provided with a plug.

4. The method for fixing the chiller on the top surface of the 3D printing sand core according to claim 1, characterized in that: In the gluing step, the coating position on the top surface of the cold iron is 10mm-20mm from the outer circle.

5. The method for fixing the chill on the top surface of the 3D printing sand core according to claim 1, characterized in that: In the chill fixing step, the glue-coated chill is pushed upward from the lower end of the sand core into the chill cavity.

6. The method for fixing the chiller on the top surface of the 3D printing sand core according to claim 1, characterized in that: A threaded hole is arranged in the middle of the magnet.

7. The method for fixing the chiller on the top surface of the 3D printing sand core according to claim 1, characterized in that: A gap is left between the cold iron cavity and the cold iron.

8. The method for fixing the chiller on the top surface of the 3D printing sand core according to claim 1, characterized in that: A gap is left between the magnet support cavity and the magnet support.

9. The method for fixing the chill on the top surface of the 3D printing sand core according to claim 1, characterized in that: A gap is left between the magnet cavity and the magnet.

10. The method for fixing the chiller on the top surface of the 3D printing sand core according to claim 1, characterized in that: The cold iron has magnetism.

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