3D printing piece hot melting embedded type thread sleeve assembly

Abstract

The invention discloses a hot-melting embedded thread sleeve assembly for a 3D printed piece, and relates to the technical field of 3D printing and additive manufacturing equipment, in particular to the international patent classification number B29C67 / 00 possibly related to the 3D printed piece hot-melting embedded thread sleeve assembly. The screw sleeve comprises a screw sleeve body, a screw rod and a screw rod, wherein a threaded hole is formed in the axis of the screw sleeve body; the outer side face of the threaded sleeve body is a big-end-up conical face. A plurality of flow guide holes penetrating through the threaded hole are formed in the outer side face of the threaded sleeve body in the circumferential direction. The heat-conducting external member comprises a scraping plate in threaded fit with the threaded hole, a heat-conducting base plate fixed at the upper part of the scraping plate, and a heat-conducting rod fixed at the upper part of the heat-conducting base plate; the heat conduction base plate is in contact fit with the upper end face of the threaded sleeve body. And the length of the scraping plate is matched with that of the threaded hole. Compared with a traditional connecting piece, the connecting piece is higher in space utilization rate, large in connecting strength and not prone to slipping.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing and additive manufacturing equipment, in particular to a 3D printed part hot-melt embedded screw sleeve assembly, and the specific international patent classification number that may be involved is B29C67 / 00. Background Art

[0002] Fused deposition modeling 3D printing technology is an important process in additive manufacturing technology, suitable for additive manufacturing of metals and hot-melt non-metallic materials. Among them, 3D printing of nylon materials is the most popular. Nylon printed parts have high material strength and low density, and are often used directly as structural parts in small batches of products. For structural parts with high connection strength requirements, the connection strength of nylon material itself cannot meet the requirements, which requires hot-melt embedding of metal parts. Generally, the larger the size of the hot-melt embedding part, the larger the contact area of ​​the weld, and the higher the connection strength. However, the larger the hot-melt embedding part, the more space it occupies, which is a thorny problem for precision structural parts with high space utilization requirements. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a 3D printed hot-melt embedded screw sleeve assembly in response to the above-mentioned technical deficiencies. Compared with traditional connectors, the 3D printed hot-melt embedded screw sleeve assembly has higher space utilization, greater connection strength and is not easy to slip.

[0004] The present invention provides a 3D printed part hot-melt embedded screw sleeve assembly, comprising:

[0005] The screw sleeve body is provided with a threaded hole on the axis; the outer side surface of the screw sleeve body is a conical surface with a larger upper portion and a smaller lower portion; the outer side surface of the screw sleeve body is provided with a plurality of guide holes penetrating the threaded hole in the circumferential direction;

[0006] A heat-conducting kit, the heat-conducting kit comprises a scraper that is threadedly matched with the threaded hole, a heat-conducting pad fixed on the upper part of the scraper, and a heat-conducting rod fixed on the upper part of the heat-conducting pad; the heat-conducting pad is in contact with the upper end surface of the screw sleeve body; the length of the scraper is matched with the length of the threaded hole.

[0007] To further optimize the technical solution, a bottom plate is provided at the lower end of the scraper; the outer side surface of the bottom plate is threadedly matched with the threaded hole.

[0008] To further optimize the technical solution, two transverse thermal resistance grooves are symmetrically arranged at the connection portion between the scraper and the heat-conducting pad; below the transverse thermal resistance grooves, the scraper is provided with a vertical thermal resistance groove in the axial direction.

[0009] To further optimize the technical solution, a planar outwardly extending limit stop ring is provided on the upper end of the outer side surface of the screw sleeve body.

[0010] To further optimize the technical solution, the upper end surface of the screw sleeve body is provided with an annular groove for increasing the heat conduction area; the lower surface of the heat conduction pad of the heat conduction sleeve is provided with an annular protrusion that matches the annular groove.

[0011] To further optimize the technical solution, a hexagonal socket is provided on the top of the heat conducting rod of the heat conducting kit.

[0012] To further optimize the technical solution, the screw sleeve body and the heat-conducting kit are both made of brass.

[0013] In the present invention, the outer side of the screw sleeve body is a conical surface that is larger at the top and smaller at the bottom; and the outer side of the screw sleeve body is provided with a plurality of guide holes penetrating the threaded hole in the circumferential direction. When the screw sleeve body is hot-embedded into the preset countersunk hole of the 3D printed part, the heat-melted material on the outer side of the screw sleeve body will squeeze into the guide holes, and when the material in the guide holes is cooled and solidified, it will fuse with the screw sleeve body as a whole, producing an anti-pull-out effect in the axial direction and an anti-torsion effect in the circumferential direction.

[0014] By screwing the scraper of the heat-conducting kit into the threaded hole of the screw sleeve body, the heat-conducting pad can be fully thermally coupled with the upper end surface of the screw sleeve body; when the screw sleeve body is hot-embedded, the scraper is pre-placed in the threaded hole, and a space for excess material to enter is reserved between the scraper and the threaded hole. The excess material that flows into the threaded hole of the screw sleeve body from the guide hole can be scraped off from the side wall of the threaded hole by screwing out the scraper. If the scraper is not provided, it is very difficult to clean the threaded hole after it is filled with excess material.

[0015] Other technical effects of the present invention will become clearer as the embodiments are described. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A simplified schematic diagram of the structure of the present invention

[0017] Figure 2 for Figure 1 Schematic diagram of the other direction.

[0018] In the figure, 1, the screw sleeve body; 2, the threaded hole; 3, the guide hole; 4, the scraper; 5, the heat-conducting pad; 6, the heat-conducting rod; 7, the bottom plate; 8, the transverse thermal resistance groove; 9, the vertical thermal resistance groove; 10, the limit stop ring; 11, the annular groove; 12, the annular protrusion; 13, the hexagonal groove. DETAILED DESCRIPTION

[0019] As shown in the figure, Figure 2 As shown:

[0020] A 3D printed part hot-melt embedded screw sleeve assembly, comprising:

[0021] A screw sleeve body 1, wherein the screw sleeve body 1 is provided with a threaded hole 2 on the axis; the outer side surface of the screw sleeve body 1 is a conical surface that is larger at the top and smaller at the bottom; the outer side surface of the screw sleeve body 1 is provided with a plurality of guide holes 3 penetrating the threaded hole 2 in the circumferential direction;

[0022] A heat-conducting kit, which includes a scraper 4 threadedly matched with the threaded hole 2, a heat-conducting pad 5 fixed on the top of the scraper 4, and a heat-conducting rod 6 fixed on the top of the heat-conducting pad 5; the heat-conducting pad 5 is in contact with the upper end surface of the screw sleeve body 1; the length of the scraper 4 is matched with the length of the threaded hole 2.

[0023] The operating steps for hot embedding of 3D printed parts are as follows: 1. Screw the scraper 4 into the threaded hole 2 of the screw sleeve body 1 to make the thermal pad 5 in good contact with the screw sleeve body 1. At this time, the screw sleeve body 1 and the thermal conductive kit are connected together; 2. Thermally couple the thermal conductive rod 6 with the electric soldering iron; 3. Align the screw sleeve body 1 with the preset countersunk hole of the 3D printed part, press down the thermal conductive rod 6, and stop pressing after the screw sleeve body 1 is hot-embedded in the countersunk hole; 4. Separate the electric soldering iron and the thermal conductive rod 6, and after the thermal conductive kit cools down, unscrew the scraper 4 from the threaded hole 2 to separate the thermal conductive kit from the screw sleeve body 1 and clear the material residue remaining in the threaded hole 2.

[0024] Figure 1 The middle flow guide holes 3 are arranged in alignment in the vertical direction, but this is not the only arrangement method, and they can also be arranged in a staggered manner in the vertical direction.

[0025] The mechanism by which the material on the outer side of the screw sleeve body 1 melts and enters the guide hole 3 is achieved through its own conical shape. When the screw sleeve body 1 sinks downward into the 3D printed material, the force exerted by the conical side on the material is divided into a vertical downward force and a radial outward force. The reaction force of the two combined forces causes the logistics to have a tendency to flow upward and toward the axis. Therefore, the flowing material will be squeezed into the guide hole 3, and the excess material will pass through the guide hole 3 and enter the threaded hole 2, rather than being squeezed out from the top along the side wall of the screw sleeve body 1, so that the appearance of the screw sleeve body 1 is neater after being embedded. The threaded body and the 3D printed part are connected by the fusion of the material in the guide hole 3, and have a higher connection strength both vertically and circumferentially. And the method of realizing hot melt connection through the guide hole 3, compared with the traditional method of realizing connection through the texture of the outer surface of the screw sleeve, occupies less space and has a greater connection strength.

[0026] To further optimize this embodiment, a bottom plate 7 is provided at the lower end of the scraper 4; the outer side surface of the bottom plate 7 is threadedly matched with the threaded hole 2.

[0027] The function of the bottom plate 7 is to seal the bottom of the threaded hole 2. When the scraper 4 is screwed out of the threaded hole 2, the excess material residues scraped by the scraper 4 can be taken out of the threaded hole 2 through the bottom plate 7 without using air flow to blow them away.

[0028] To further optimize this embodiment, two transverse thermal resistance grooves 8 are symmetrically provided at the connection portion between the scraper 4 and the thermal conductive pad 5 ; below the transverse thermal resistance grooves 8 , the scraper 4 is provided with vertical thermal resistance grooves 9 in the axial direction.

[0029] Since the scraper 4 is only partially threadedly connected to the threaded hole 2, when the scraper 4 also conducts heat, it will cause uneven heating of the screw sleeve body 1, which may cause directional deviation when embedded in the countersunk hole; the function of the horizontal thermal resistance groove 8 and the vertical thermal resistance groove 9 is to reduce the thermal conductivity of the scraper 4 and improve the uniformity of heating of the screw sleeve body 1.

[0030] To further optimize this embodiment, a planar extending limit stop ring 10 is provided on the upper end of the outer surface of the screw sleeve body 1.

[0031] The function of the limit stop ring 10 is to provide a limit prompt for the hot embedding of the screw sleeve body 1.

[0032] To further optimize this embodiment, the upper end surface of the screw sleeve body 1 is provided with an annular groove 11 for increasing the heat conduction area; the lower surface of the heat conduction pad 5 of the heat conduction sleeve is provided with an annular protrusion 12 that matches the annular groove 11 in a concave-convex manner.

[0033] Since the screw sleeve body 1 itself is a conical tubular structure, in order to increase the thermal contact area between it and the heat-conducting pad 5, the annular groove 11 is provided by utilizing the width of the limit stop ring 10 to improve the efficiency of heat embedding.

[0034] To further optimize this embodiment, a hexagonal groove 13 is provided on the top of the heat conducting rod 6 of the heat conducting kit.

[0035] The function of the hexagonal groove 13 is to facilitate the removal of the heat-conducting sleeve from the screw sleeve body 1 by twisting the heat-conducting rod 6 after the hot embedding is completed.

[0036] To further optimize this embodiment, the screw sleeve body 1 and the heat-conducting sleeve are both made of brass.

[0037] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0038] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A 3D printed hot melt embedded screw sleeve assembly, characterized in that: include: The screw sleeve body is provided with a threaded hole on the axis; the outer side surface of the screw sleeve body is a conical surface with a larger upper portion and a smaller lower portion; the outer side surface of the screw sleeve body is provided with a plurality of guide holes penetrating the threaded hole in the circumferential direction; A heat-conducting kit, the heat-conducting kit comprises a scraper that is threadedly matched with the threaded hole, a heat-conducting pad fixed on the upper part of the scraper, and a heat-conducting rod fixed on the upper part of the heat-conducting pad; the heat-conducting pad is in contact with the upper end surface of the screw sleeve body; the length of the scraper is matched with the length of the threaded hole.

2. A 3D printed part hot melt embedded screw sleeve assembly according to claim 1, characterized in that : A bottom plate is arranged at the lower end of the scraper; the outer side surface of the bottom plate is threadedly matched with the threaded hole.

3. A 3D printed part hot-melt embedded screw sleeve assembly according to claim 2, characterized in that: The connection part between the scraper and the heat-conducting pad is symmetrically provided with two transverse thermal resistance grooves; below the transverse thermal resistance grooves, the scraper is provided with a vertical thermal resistance groove in the axial direction.

4. A 3D printed part hot melt embedded screw sleeve assembly according to claim 1, characterized in that A planar extending limit stop ring is provided at the upper end of the outer side surface of the screw sleeve body.

5. A 3D printed part hot melt embedded screw sleeve assembly according to claim 4, characterized in that : The upper end surface of the screw sleeve body is provided with an annular groove for increasing the heat conduction area; the lower surface of the heat conduction pad of the heat conduction sleeve is provided with an annular protrusion that matches the annular groove.

6. A 3D printed part hot melt embedded screw sleeve assembly according to claim 1, characterized in that : A hexagonal groove is arranged on the top of the heat conducting rod of the heat conducting kit.

7. A 3D printed part hot melt embedded screw sleeve assembly according to claim 1, characterized in that : The screw sleeve body and the heat conduction kit are both made of brass.

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