A polishing jig for hot runner manifold gate orifice

Abstract

The utility model discloses a kind of for hot runner shunt plate runner hole's polishing jig, the shunt plate has the runner hole through along its length direction and is opened with two plug hole extending along its thickness direction, two the plug hole vertically pass through the runner hole, the polishing jig can be inserted in any the plug hole, and the polishing jig is opened with when it is inserted in corresponding the plug hole, it is communicated with the runner hole and can be passed through to the butt joint hole of polishing tool to polish the runner hole. The jig is used to assist polishing runner hole, simple structure, easy to operate and strong compatibility, isolate runner hole joint when polishing, will not cause runner hole joint deformation or size change greatly, can keep polishing tool, make runner hole wall uniform stress when polishing, significantly reduce scratch and uneven problem of texture, reduce polishing operation difficulty, improve polishing efficiency.

Description

Technical Field

[0001] This utility model relates to the field of hot runner manifold channel hole surface technology, specifically to a polishing fixture for hot runner manifold channel holes. Background Technology

[0002] As a critical fluid control component, the manifold of a hot runner system determines the quality of plastic fluid transmission through the surface roughness of its internal runner orifices and the quality of the runner connection with the orifice plugs, directly impacting the quality of injection-molded products. If the roughness of the runner orifices after machining does not meet injection molding requirements, multiple polishing sessions with sandpaper are necessary. Excessively high surface roughness (e.g., Ra value > 1.6 μm) increases the frictional resistance between the thermoplastic material (hereinafter referred to as "melt") and the orifice wall, leading to uneven flow velocity. Large differences in roughness in the runner orifices exacerbate uneven shear heat distribution in the melt, potentially causing localized overheating and decomposition or cold material accumulation. Cold melt residue remaining on the rough orifice wall may be carried into the mold cavity, causing surface pitting or decreased gloss, increasing the defect rate. Dimensional differences at the junctions of the manifold and other hot runner system components create step differences, hindering melt flow and causing prolonged melt residue leading to decomposition and variation, also resulting in product defects.

[0003] However, existing flow channel polishing processes generally employ manual polishing, which presents the following technical problems:

[0004] 1. Uneven roughness: The original polishing process for flow channel holes is difficult to control in terms of force and direction, which can easily lead to uneven roughness of the flow channel holes;

[0005] 2. Deformation at the joint between the flow channel hole and the flow channel hole plug: The original polishing process is prone to causing deformation at the joint of the flow channel hole, resulting in poor melt flow;

[0006] 3. High polishing cost: It requires experienced technicians and incurs high labor costs;

[0007] 4. Low polishing efficiency: The polishing process requires careful attention to the polishing force and position, resulting in poor polishing stability and low efficiency.

[0008] This utility model was developed to address the problems existing in the prior art. Utility Model Content

[0009] To address one of the aforementioned technical problems, the purpose of this utility model is to provide a polishing fixture for flow channel holes in hot runner manifolds. This fixture aims to solve the problems of easy deformation at the joint of flow channel holes, uneven surface roughness, and poor polishing quality in traditional polishing processes. It is suitable for the processing of manifolds in the precision manufacturing industry. This fixture is used to assist in polishing flow channel holes. It has a simple structure, is easy to operate, and has strong compatibility. It optimizes the polishing process, improves the consistency of flow channel hole roughness, and ensures the dimensional requirements at the joint of flow channel holes.

[0010] The technical solution of this utility model is:

[0011] The purpose of this utility model is to provide a polishing fixture for the flow channel hole of a hot runner manifold. The manifold has a flow channel hole that extends along its length and two plug holes that extend along its thickness. Both plug holes pass perpendicularly through the flow channel hole. The polishing fixture can be inserted into either of the plug holes and has a mating hole that connects with the flow channel hole when it is inserted into the corresponding plug hole and allows a polishing tool to pass through to polish the flow channel hole.

[0012] Preferably, the polishing fixture includes a cylindrical body that matches the outer diameter of the plug hole, and the mating hole extends through both side walls of the fixture perpendicular to its axial direction.

[0013] Preferably, the polishing fixture further includes a positioning element disposed on the side wall of one axial end of the body and extending in the radial direction of the body;

[0014] A radially extending positioning groove is provided on one surface of the flow divider in the thickness direction and on one side corresponding to one axial end of the plug hole.

[0015] When the body is inserted into any of the plug holes and fixed, the end of the positioning member is adapted to abut against the side of the positioning groove.

[0016] Preferably, a fixing hole is formed on another surface of the flow divider plate in the thickness direction, extending along the axial direction of the plug hole and communicating with the plug hole;

[0017] The end of the body opposite to the positioning member has a connecting hole corresponding to the fixing hole;

[0018] After the main body is inserted into the plug hole, fasteners are sequentially inserted into the fixing hole and the connecting hole to fix the main body to the diverter plate.

[0019] Preferably, the connecting hole is a threaded hole.

[0020] Preferably, the positioning element is a positioning pin.

[0021] Preferably, the positioning element is an integral structure with the body or is detachably connected together.

[0022] Preferably, the diameter of the mating hole is 0.2 mm smaller than the diameter of the flow channel hole.

[0023] Preferably, the hardness of the polishing fixture is 50~55HRC.

[0024] Compared with the prior art, the advantages of this utility model are:

[0025] This invention relates to a polishing fixture for flow channel holes in hot runner manifolds. This fixture assists in polishing flow channel holes, featuring a simple structure, easy operation, and strong compatibility. During use, the fixture is fixed within the plug hole of the flow channel to isolate the flow channel hole joint, ensuring that the polishing force acts only on the target polishing area. This effectively protects the already machined surface and sharp edges of the workpiece, preventing accidental damage or wear during processing. Simultaneously, the fixture holds the polishing tool, ensuring uniform force on the flow channel hole wall during polishing, significantly reducing scratches and uneven texture. This optimizes the polishing process, ensures consistent flow channel hole roughness, and guarantees dimensional accuracy and non-deformation at the flow channel hole joint, reducing polishing difficulty and improving polishing efficiency. It solves the problems of easy deformation at the flow channel hole joint, uneven hole surface roughness, and poor polishing quality in traditional polishing processes, and is suitable for processing flow channel plates in the precision manufacturing industry. It reduces reliance on manual skills; operators only need to perform simple fixture installation and fixing, shortening polishing time and increasing efficiency by over 40%. The yield rate has been greatly improved, which directly reduces waste. At the same time, the increased efficiency has reduced the labor and energy costs per unit. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0027] Figure 1 This is a schematic diagram of the polishing fixture for the flow channel hole of the hot runner manifold according to an embodiment of the present invention, and the structure of the polishing fixture when the manifold is not assembled and the polishing fixture explodes.

[0028] Figure 2 for Figure 1 A cross-sectional view of the polishing fixture and the manifold after assembly (sectioned along the axis of the plug hole; only a portion of the polishing tool is shown).

[0029] Figure 3 for Figure 2 Enlarged view of section A in the middle;

[0030] Figure 4 This is a cross-sectional view of the polishing fixture according to an embodiment of the present utility model;

[0031] Figure 5for Figure 2 A partial view of the polishing fixture is omitted from section A.

[0032] Among them: 10, polishing fixture; 11, body; 111, docking hole; 112, connecting hole; 12, positioning component; 20, flow divider; 21, flow channel hole; 22, plug hole; 23, positioning groove; 24, fixing hole; 30, polishing tool. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0034] See Figures 1 to 5 This invention discloses a polishing fixture for a flow channel hole in a hot runner manifold, wherein the manifold 20 has a flow channel hole 21 extending through both ends of the manifold 20 along its length. The shape of the manifold 20 is not specifically described or limited, as it is existing technology and not an innovation of this invention. The manifold 20 also has two plug holes 22 extending along its thickness direction. During normal use, a plug with a flow channel hole 21 (not shown, but described as the second flow channel hole 21 for easy distinction) is placed inside the plug hole 22 to connect to the flow channel hole 21 (described as the first flow channel hole 21 for easy distinction) within the manifold 20. This is also existing technology and is not specifically described or limited. Figure 1 As shown, the two plug holes 22 are symmetrically arranged on the left and right sides. Specifically, for the polishing fixture 10 of this embodiment, as shown... Figure 1 As shown, it includes a cylindrical body 11. The outer diameter of the body 11 matches the inner diameter of the plug hole 22 (actually slightly smaller than the inner diameter of the plug hole 22, but not specifically limited; those skilled in the art can choose the design according to actual needs, the purpose being to facilitate the smooth insertion of the body 11 into the plug hole 22 during installation). A connecting hole 111, perpendicular to the axial direction of the body 11 and radially penetrating, is also opened inside the body 11. After the body 11 is inserted into the corresponding plug hole 22 and fixed, the connecting hole 111 communicates with the flow channel hole 21 in the diverter plate 20, allowing the polishing tool 30 to extend from one end of the flow channel hole 21 of the diverter plate 20 into the flow channel hole 21 to polish the flow channel hole 21. Specifically, suitable sandpaper is selected and polished multiple times from coarse to fine until the desired roughness is achieved. Because the polishing fixture 10 is fixed into the plug hole 22 during polishing, the joint between the flow channel hole 21 of the diverter plate 20 and the plug hole 22 ( Figure 3As shown in section B, the polishing force is isolated, ensuring that it acts only on the target area (the inner wall surface of the flow channel hole 21, excluding the joint). This effectively protects the already machined surface and sharp edges of the workpiece, preventing accidental damage or wear during processing, protecting the non-polished areas, and avoiding secondary damage. Consequently, it prevents significant dimensional changes at the joint of the flow channel hole 21. Furthermore, because the polishing fixture 10 is fixed to the flow divider plate 20, the polishing tool 30 remains stable during polishing, resulting in uniform force on the wall of the flow channel hole 21 during polishing. This significantly reduces scratches and uneven texture, thereby improving product yield, reducing scrap losses, lowering per-piece labor and energy costs, increasing efficiency by over 40%, and reducing reliance on manual skills. Operators only need to perform simple fixture assembly and disassembly.

[0035] To facilitate assembly and disassembly, and because the outer diameter of the polishing fixture 10 is slightly smaller than that of the plug hole 22, although the gap is small, movement can still occur. This movement is particularly noticeable under the vibration of the polishing tool, which can affect the polishing quality of the product. Therefore, it is also necessary to prevent the fixture from shifting during the polishing process. Figure 1 and Figure 4 As shown, the polishing fixture 10 also includes at least one positioning element 12, as exemplarily described in this embodiment of the present invention. Figure 4 The diagram shows a positioning element 12, which is fixed to the outer wall surface of one axial end of the body 11, and the extension direction of the positioning element 12 is perpendicular to the axial direction of the body 11, that is, it extends along the radial direction of the body 11. When there are two or more positioning elements, they can be evenly distributed around the outer peripheral wall of the body 11. The positioning element 12 is preferably an integral structure with the body 11. As an alternative embodiment, the two can also be fixed together in a detachable manner, such as by threaded connection. For the positioning element 12, by example, the present invention uses a conventional positioning pin. Specifically, on the diverter plate 20, it refers to a surface in the thickness direction of the diverter plate 20, that is, as shown in the diagram. Figure 2 or Figure 3 or Figure 5 The lower surface shown corresponds to one end of the plug hole 22 along its axial direction, i.e. Figure 5 The lower side shown ( Figure 5 (The middle is on the left) There is an opening on the other surface of the splitter plate 20, that is, as shown in the image. Figure 5 The positioning groove 23 extends outward from the upper surface and radially along the plug hole 22, as shown. During installation, the end of the positioning member 12 is specifically as follows: Figure 3 The left end shown abuts against the side of the positioning groove 23, that is, as Figure 5 The left side wall of the positioning groove 23 shown can prevent the fixture from being positioned in the axial direction of the flow channel hole 21, i.e. Figure 2 The horizontal displacement is shown, and at the other end of the body 11, that is, as shown... Figure 4As shown, a connecting hole 112 is provided at the middle of the upper end, extending downward along its axis. The other surface of the corresponding diverter plate 20 is also as shown. Figure 2 The upper surface shown has a fixing hole 24 that communicates with the plug hole 22. The fixing hole 24 corresponds to the connecting hole 112 of the body 11. Fasteners are sequentially inserted into the fixing hole 24 and the connecting hole 112 to fix the fixture to the base (not shown). This prevents the fixture from moving axially relative to the flow divider 20, thereby maintaining the fixture's position within the plug hole 22 and keeping the polishing tool 30 stable. This ensures uniform force distribution throughout the inner wall of the flow channel hole 21 during polishing, thus ensuring a high polishing yield. In some preferred embodiments, the connecting hole 112 is a threaded hole, employing a threaded connection method, which is simple in structure and provides a reliable connection. The fixing hole 24 is not particularly limited and can be a threaded hole or a smooth round hole.

[0036] Regarding the diameters of the mating hole 111 and the flow channel hole 21, in this embodiment of the invention, the diameter of the mating hole 111 is preferably smaller than the diameter of the flow channel hole 21, with a difference of approximately 0.2 mm. The applicant's research has revealed that if the diameter of the mating hole 111 is too small, i.e., the difference is greater than 0.2 mm, the polishable distance of the flow channel hole 21 will increase, and the polishing efficiency will decrease. Conversely, if the diameter of the mating hole 111 is too large, i.e., the difference is less than 0.2 mm or even greater than the diameter of the flow channel hole 21, it will cause deformation of the flow channel hole 21. This will affect the actual diameter requirement of the flow channel hole 21, resulting in products that do not meet requirements.

[0037] Since the polishing tool 30 needs to pass through the mating hole 111 inside the polishing fixture 10 during the polishing process, in order to prevent the polishing tool 30 from causing a significant change in the diameter of the mating hole 111 during the polishing process, this embodiment of the invention has certain requirements on the hardness of the polishing fixture 10. That is, the polishing fixture 10 needs to have sufficient mechanical strength to withstand the polishing pressure and avoid workpiece deformation after polishing. The applicant found through research that the fixture can meet the above requirements when it reaches a hardness of 50~55HRC after heat treatment. As for the material of the polishing fixture 10, there are no special limitations, as long as the hardness meets the above requirements.

[0038] In this embodiment of the polishing fixture 10, during use, the positioning member 12 is assembled with the body 11 and placed into the plug hole 22 of the diverter plate 20. Fasteners are then used to sequentially pass through the fixing hole 24 on one side of the plug hole 22 of the diverter plate 20 and the connecting hole 112 on the body 11 to fix the plug inside the diverter plate 20 and to the base. After the fixture assembly is completed, as shown... Figure 2As shown, a polishing tool 30 (which can be held by a robotic arm (not shown) and controlled by a motor, is a rod-shaped structure with removable sandpaper or abrasive pads on its outer surface for changing according to the product roughness requirements) is horizontally inserted into one end of the flow channel hole 21 and gradually moved to the other end to achieve polishing of the target area. In actual operation, appropriate sandpaper is selected according to the roughness requirements, and polishing is performed multiple times from coarse to fine until the roughness of the flow channel hole 21 meets the requirements, i.e., no higher than 1.6μm. The specific roughness is determined according to the actual roughness requirements and is not limited. Finally, the remaining debris in the flow channel hole 21 is cleaned away. The cleaning method is not described or limited, as it is existing technology and not an innovation of this utility model. Because the fixture isolates the joint of the flow channel holes 21, and its presence keeps the polishing tool 30 stable during polishing, the walls of the flow channel holes 21 are evenly stressed during polishing, avoiding excessive friction at the joint of the flow channel holes 21. Therefore, it does not cause deformation or significant changes in size at the joint of the flow channel holes 21, significantly reducing scratches and uneven texture. It can protect non-polished areas and prevent secondary damage. It can improve polishing yield and surface quality, increasing efficiency by more than 40%, shortening polishing time, and reducing reliance on worker skills. Operators only need to perform simple fixture assembly and disassembly, optimizing production efficiency and costs. The improved yield directly reduces scrap loss, and the increased efficiency reduces labor and energy costs per piece, resulting in a significant decrease in overall costs. The polishing fixture 10 of this embodiment is reusable, and the innovative stable support structure for the polishing tool 30 solves the problem of dimensional deformation at the joint of the flow channel holes.

[0039] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A polishing fixture for a flow channel hole in a hot runner manifold, wherein the manifold has a flow channel hole extending along its length and two plug holes extending along its thickness, both of the plug holes perpendicularly passing through the flow channel hole, characterized in that, The polishing fixture can be inserted into any of the plug holes, and the polishing fixture has a mating hole that communicates with the flow channel hole when it is inserted into the corresponding plug hole, and allows a polishing tool to pass through to polish the flow channel hole.

2. The polishing fixture according to claim 1, characterized in that, The polishing fixture includes a cylindrical body that matches the outer diameter of the plug hole, and the mating hole extends through its two side walls perpendicular to the axis of the polishing fixture.

3. The polishing fixture according to claim 2, characterized in that, The polishing fixture also includes a positioning element disposed on the side wall of one axial end of the body and extending in the radial direction of the body. A radially extending positioning groove is provided on one surface of the flow divider in the thickness direction and on one side corresponding to one axial end of the plug hole. When the body is inserted into any of the plug holes and fixed, the end of the positioning member is adapted to abut against the side of the positioning groove.

4. The polishing fixture according to claim 3, characterized in that, A fixing hole is formed on another surface of the flow divider plate in the thickness direction, extending along the axial direction of the plug hole and communicating with the plug hole. The end of the body opposite to the positioning member has a connecting hole corresponding to the fixing hole; After the main body is inserted into the plug hole, fasteners are sequentially inserted into the fixing hole and the connecting hole to fix the main body to the diverter plate.

5. The polishing fixture according to claim 4, characterized in that, The connecting hole is a threaded hole.

6. The polishing fixture according to claim 3, characterized in that, The positioning component is a positioning pin.

7. The polishing fixture according to claim 3, characterized in that, The positioning element is either an integral part of the main body or detachably connected to it.

8. The polishing fixture according to any one of claims 1 to 7, characterized in that, The diameter of the mating hole is 0.2 mm smaller than the diameter of the flow channel hole.

9. The polishing fixture according to claim 1, characterized in that, The hardness of the polishing fixture is 50~55HRC.

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