Anti-feeding insert and matched mold structure

Abstract

The utility model discloses an anti-feeding insert and a matched mold structure, and aims to solve the problem that a blind hole insert in the prior art is easy to move during mold pressing of a composite material SMC (Sheet Molding Compound), so that the material enters an insert thread. The die comprises a lower die, a positioning pin and an insert nut, the positioning pin is vertically arranged in the middle of the lower die, and the insert nut is sleeved on the positioning pin. The key innovation lies in that a round lower die sinking table is arranged at the position, corresponding to the positioning pin, of the lower die, a round flange face capable of sinking into the lower die sinking table is arranged at the lower end of the insert nut, the depth of the lower die sinking table is larger than the thickness of the flange face, and SMC materials are effectively prevented from entering insert threads. In addition, the diameter of the flange face is 1.6-1.8 times larger than that of the upper end of the insert nut, and stability of the insert is enhanced. An inner hole of the insert nut is provided with a chamfer, so that interference with a lower die is avoided; the clearance between the positioning pin and the internal thread of the insert nut is smaller than 0.1 mm, so that accurate positioning is realized; a groove is formed in the side face of the insert nut, and the drawing force of the insert is improved. The device is ingenious in structure, effectively avoids the problem of material channeling, improves the production efficiency, reduces the production cost, and has remarkable technical progress and practical application value.

Description

TECHNICAL FIELD

[0001] The utility model relates to the mould field especially relates to a prevent feeding insert part and matched mould structure. BACKGROUND

[0002] In modern manufacturing industry, the blind hole thread insert is widely used in the forming process of various plastics, SMC composite materials or other materials as connection and fixing components. The conventional blind hole thread insert design usually includes a threaded cylindrical part and a plane below the cylinder, which contacts with the mold surface when the mold is closed to realize the positioning and fixing of the insert.

[0003] In order to ensure the stability of the insert in the mold and prevent the SMC material from leaking, the plane below the insert should be completely matched with the mold surface. But in actual operation, due to the influence of machining accuracy, material thermal expansion and contraction, mold wear and other factors, it is often difficult to achieve absolute matching between the plane below the insert and the mold surface, but there is a small gap. Although these gaps seem insignificant, when the SMC material flows in the mold cavity under high pressure, the material will flow along these gaps and may generate an upward thrust on the insert. This thrust not only may cause the insert to move slightly in the mold, affecting the size accuracy and appearance quality of the product, more seriously, the injection material may flow into the thread port position of the insert. Once the material cools and solidifies, it will form excess residues in the thread, which is called "material channeling".

[0004] The existence of material channeling not only increases the difficulty and cost of subsequent processing, because additional silk removal process is needed to remove the excess material remaining in the insert thread, but also may damage the thread structure of the insert, reduce its connection strength and sealing performance. Therefore, how to solve the matching problem between the conventional blind hole thread insert and the mold surface and prevent the occurrence of material channeling is a technical problem to be solved by the technical personnel in the field. CONTENT OF THE UTILITY MODEL

[0005] In view of the problems in the background art, the utility model provides a prevent feeding insert part and matched mould structure, which solves the problem of material entering the insert thread caused by material channeling during injection molding of the blind hole insert in the prior art. The device comprises a lower mold, a positioning pin and an insert nut, the positioning pin is vertically arranged in the middle of the lower mold, and the insert nut is sleeved on the positioning pin.

[0006] Further, the lower mold is provided with a circular lower mold sunken platform at the position of the positioning pin, and the lower end of the insert nut is provided with a circular flange surface, and the flange surface is placed in the inside of the lower mold sunken platform.

[0007] Further, the lower mold sink depth is 1.8mm to 2.2mm, the flange face thickness is 1.7mm to 2.1mm, and the depth of the lower mold sink is greater than the thickness of the flange face.

[0008] Further, the flange face diameter is 1.6 to 1.8 times greater than the upper end diameter of the insert nut.

[0009] Preferably, the insert nut inner hole is provided with a C0.5 chamfer, which prevents the insert nut from interfering with the lower mold and causing the insert nut to be unable to be fixed in place.

[0010] Preferably, the gap between the positioning pin and the insert nut inner thread is less than 0.1mm.

[0011] Preferably, the insert nut side is provided with a groove, which is used to prevent the insert nut from being pulled out from the product when used for bolt locking.

[0012] Preferably, the flange face is provided with a chamfer, which prevents the flange face from being unable to completely fit the lower mold sink.

[0013] The utility model discloses the advantages and beneficial effects lie in: the utility model discloses a circular lower mold sink is arranged in the lower mold, and the circular flange face of the lower end of the insert nut is placed in the sink, and this structural design makes that in the SMC mould pressing process, the material pressure flow basically will not push the insert upwards, thereby effectively avoid the problem that the material enters the insert thread. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the drawings needed to be used in the embodiment description will be simply introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0015] Figure 1 It is the schematic diagram of the utility model.

[0016] Wherein, 1-the lower mold, 11-the lower mold sink, 2-the positioning pin, 3-the insert nut, 31-the flange face, 32-the groove. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the utility model will be apparently and completely described in connection with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the person skilled in the art without creative labor belong to the range protected by the utility model. In addition, it should be understood that the specific implementation manners described herein are only used for illustrating and explaining the utility model, and are not used for limiting the utility model. In the utility model, the orientation words such as 'upper' and 'lower' are generally used for indicating the upper and lower in the actual use or working state of the device, and the specific is the drawing direction in the drawings; and 'inner' and 'outer' are used for the contour of the device.

[0018] As shown in the figure, the equipment mainly comprises a lower mold 1, a positioning pin 2 and an insert nut 3: Figure 1

[0019] In the middle of the lower mold 1, the positioning pin 2 is fixed vertically, which is used for accurately positioning the insert nut 3. The insert nut 3 is sleeved on the positioning pin 2 and can move up and down along the positioning pin 2 but is limited by the positioning pin 2 and cannot deviate from the center position.

[0020] The lower mold 1 is provided with a circular lower mold sunken platform 12 at the position corresponding to the positioning pin 2, and the lower end of the insert nut 3 is provided with a circular flange face 31 matched with it. The flange face 31 is designed to be completely sunk into the lower mold sunken platform 12. In the embodiment, the depth of the lower mold sunken platform 12 is 2.1mm, and the thickness of the flange face 31 is 2mm, so that the depth of the lower mold sunken platform 12 is greater than the thickness of the flange face 31, forming effective blocking.

[0021] The diameter of the flange face 31 is set to be 1.6 to 1.8 times of the upper end diameter of the insert nut 3. This design not only increases the contact area of the insert nut 3 and the lower mold 1, but also significantly improves the stability of the insert nut 3 in the mold. In the embodiment, the upper end diameter of the insert nut 3 is 15mm, and the diameter of the flange face 31 is 24mm.

[0022] A C0.5 chamfer is arranged at the inner hole of the insert nut 3, which avoids the interference between the insert nut 3 and the lower mold 1 during assembly, and ensures that the insert nut 3 can be smoothly and accurately fixed in place.

[0023] The gap between the positioning pin 2 and the inner thread of the insert nut 3 is strictly controlled within 0.1mm, which realizes the accurate positioning of the insert nut 3 in the mold.

[0024] ​The side surface of the insert nut 3 is provided with a ring of grooves 32, which provides additional space for bolt locking and prevents the insert nut 3 from being pulled out during disassembly.

[0025] The outer periphery of the flange surface 31 is provided with a chamfer, which ensures that the flange surface 31 can completely fit into the lower mold sink 12, further enhancing the stability and sealing of the structure.

[0026] Specific use steps:

[0027] In this embodiment, the insert nut 3 is sleeved on the positioning pin 2, and the flange surface 31 is completely sunk into the lower mold sink 12. Next, the upper mold is lowered, and the SMC molding operation is performed. Due to the blocking effect of the flange surface 31 and the close fit between the lower mold sink 12 and the flange surface 31, the SMC material basically cannot push the insert nut 3 upward during pressure flow, thereby effectively avoiding the problem of material entering the insert thread, achieving efficient, clean and stable production process.

[0028] The above describes in detail the anti-material-inserting insert and the matching mold structure provided by the utility model. The principles and implementation modes of the present application are described by applying specific examples. The above description of the embodiments is only used to help understand the method of the utility model and its core idea. It should be pointed out that for ordinary skilled persons in the technical field, some improvements and modifications can be made to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the utility model.

Claims

1. A feed-proof insert and a matching mold structure, comprising a lower mold (1), a positioning pin (2) and an insert nut (3), wherein the positioning pin (2) is vertically arranged in the middle of the lower mold (1), and the insert nut (3) is sleeved on the positioning pin (2), characterized in that: The lower die (1) is provided with a circular lower die sinking platform (11) at the location where the positioning pin (2) is provided. The lower end of the insert nut (3) is provided with a circular flange surface (31), and the flange surface (31) is placed inside the lower die sinking platform (11).

2. The anti-feeding insert and the matching mold structure according to claim 1, characterized in that: The depth of the lower die sinking platform (11) is 1.8 mm to 2.2 mm, and the thickness of the flange surface (31) is 1.7 mm to 2.1 mm. The depth of the lower die sinking platform (11) is greater than the thickness of the flange surface (31).

3. The anti-feeding insert and the matching mold structure according to claim 2, characterized in that: The diameter of the flange surface (31) is 1.6 to 1.8 times greater than the diameter of the upper end of the insert nut (3).

4. The anti-feeding insert and the matching mold structure according to claim 3, characterized in that: The inner hole of the insert nut (3) is provided with a chamfer of C0.

5.

5. The anti-feeding insert and the matching mold structure according to any one of claims 1 to 4, characterized in that: The gap between the positioning pin (2) and the internal thread of the insert nut (3) is less than 0.1 mm.

6. The anti-feeding insert and the matching mold structure according to any one of claims 1 to 4, characterized in that: A circle of grooves (32) is provided on the side of the insert nut (3).

7. The anti-feeding insert and the matching mold structure according to any one of claims 1 to 4, characterized in that: The flange surface (31) is provided with a chamfered periphery.

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