Die capable of automatically cutting off cloth on parting surface

Abstract

The utility model discloses a mold for automatically cutting off cloth on a parting surface, which comprises a movable mold and a fixed mold, the movable mold comprises a movable mold parting surface, the fixed mold comprises a fixed mold parting surface, and a cloth hanging needle extending towards the fixed mold is arranged on one side of the movable mold parting surface; a knife edge protruding towards the movable mold is arranged on the parting surface of the fixed mold along a parting line, and the knife edge is in contact with the parting surface of the movable mold; according to the utility model, the positioned cloth can be cut while the mold is closed for injection molding of the part, so that the cloth can be paved on the edge of the part in a uniform width, the efficiency of reversely wrapping the cloth on the edge of the injection-molded part is greatly improved, the width uniformity of the cut cloth can be ensured, and the production efficiency is improved. And the situation that parts are scratched in the cloth cutting process can also be avoided.

Description

Technical Field

[0001] This utility model belongs to the technical field of injection molds, specifically relating to a mold that automatically cuts off fabric at the parting surface. Background Technology

[0002] When performing low-pressure injection molding on plastic molds, a 10mm wide strip of fabric needs to be left around the edge of the molded product to wrap the edge of the part. In existing technology, after the part is injection molded, it is removed from the mold, the fabric is laid on the edge of the part, and then a cutting tool is used to cut the fabric along the edge of the part. However, this fabric cutting process not only causes positioning errors of the fabric at the edge of the part, but also significantly increases the operator's time. Furthermore, the fabric cutting process may scratch the edge of the part, and it is difficult to ensure the uniformity of the cut fabric width.

[0003] Therefore, in view of the above-mentioned problems in the process of cutting and wrapping the fabric at the edge of the part after the part is injection molded, the present invention discloses a mold for automatically cutting the fabric at the parting surface. Utility Model Content

[0004] This utility model discloses a mold for automatically cutting fabric at the parting surface, which can cut the positioned fabric while the mold is closed for injection molding of the part, ensuring that the fabric is laid on the edge of the part with a uniform width.

[0005] This utility model is achieved through the following technical solution:

[0006] A mold for automatically cutting fabric at a parting surface includes a moving mold and a fixed mold. The moving mold includes a moving mold parting surface, and the fixed mold includes a fixed mold parting surface. A fabric hanging needle extending toward the fixed mold is provided on one side of the moving mold parting surface. A cutting edge protruding toward the moving mold is provided along the parting line on the fixed mold parting surface, and the cutting edge contacts the moving mold parting surface.

[0007] The moving mold is connected to the moving mold side of the injection molding machine, and the fixed mold is connected to the fixed mold side of the injection molding machine. The fabric is hung on the hanging pins. During injection molding, the moving mold side of the injection molding machine moves towards the fixed mold side to close the mold. At this time, a part injection cavity is formed between the fixed mold and the moving mold. The injection molding machine injects the part into the part injection cavity to form the part. At the same time as injection molding, the cutting edge on the parting surface of the fixed mold contacts the parting surface of the moving mold. Through the squeezing and shearing action of the cutting edge, the fabric located between the parting surface of the fixed mold and the parting surface of the moving mold is evenly cut along the parting line. That is, the fabric at the edge of the part is removed simultaneously during the part injection molding process.

[0008] To better realize this utility model, furthermore, fabric gaps are provided on both sides of the blade.

[0009] To better realize this utility model, a product forming cavity is further provided between the moving mold and the fixed mold, and the product forming cavity is connected to the fabric gap.

[0010] To better realize this utility model, the fabric gap further includes a proximal gap close to the product forming cavity and a distal gap away from the product forming cavity, and the width of the proximal gap gradually decreases along the direction from the blade edge to the product forming cavity.

[0011] To better realize this utility model, the width of the fabric gap is further one-fifth to one-third of the width of the product forming cavity.

[0012] To better realize this utility model, the cutting edge is further provided with a transition arc segment at the corner position of the parting line.

[0013] To better realize this utility model, the transition arc segment extends toward the mold parting surface.

[0014] To better realize this utility model, the hanging needle is further disposed on the side of the moving mold parting surface away from the molding part.

[0015] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0016] This invention features a cutting edge along the parting line on the fixed mold parting surface. During the injection molding process of the moving mold and the fixed mold, the cutting edge simultaneously contacts the moving mold parting surface to cut the fabric between the moving mold parting surface and the fixed mold parting surface. This results in the fabric being cut to a uniform width and then laid on the edge of the part. This not only greatly improves the efficiency of wrapping the edges of the injection molded part with fabric, but also ensures the uniformity of the fabric width after cutting and avoids scratching the part during the fabric cutting process. Attached Figure Description

[0017] Figure 1 A structural diagram of a mold for automatically cutting off fabric at the parting line;

[0018] Figure 2 This is a schematic diagram of the proximal and distal gaps;

[0019] Figure 3 This is a schematic diagram of the moving mold structure;

[0020] Figure 4 This is a schematic diagram of the fixed mold structure;

[0021] Figure 5 for Figure 4 A magnified view of part A.

[0022] Wherein: 1-moving mold; 2-fixed mold; 3-cloth hanging needle; 4-cutting edge; 5-cloth gap; 6-transition arc segment; 7-product forming cavity; 11-moving mold parting surface; 21-fixed mold parting surface; 51-proximal gap; 52-far end gap. Detailed Implementation

[0023] Example 1:

[0024] This embodiment provides a mold for automatically cutting off fabric at the parting surface, such as... Figures 1-4 As shown, it includes a moving mold 1 and a fixed mold 2. The moving mold 1 includes a moving mold parting surface 11, and the fixed mold 2 includes a fixed mold parting surface 21. A cloth hanging needle 3 extending toward the fixed mold 2 is provided on one side of the moving mold parting surface 11. A cutting edge 4 protruding toward the moving mold 1 is provided on the fixed mold parting surface 21 along the parting line. The cutting edge 4 contacts the moving mold parting surface 11.

[0025] The moving mold 1 is connected to the moving mold side of the injection molding machine, and the moving mold 1 is moved by the moving mold side. The fixed mold 2 is connected to the fixed mold side of the injection molding machine, and during the injection molding process, the moving mold 1 is moved towards the fixed mold 2 by the moving mold side of the injection molding machine to achieve mold closing. On the side of the moving mold 1 close to the fixed mold 2, a moving mold parting surface 11 is provided corresponding to the molding contour of the part. On the side of the fixed mold 2 close to the moving mold 1, a fixed mold parting surface 21 is provided corresponding to the molding contour of the part. When the moving mold 1 and the fixed mold 2 are closed, a part molding cavity is formed between the moving mold parting surface 11 and the fixed mold parting surface 21.

[0026] Before mold closing, the fabric is evenly hung on the hanging needles 3, so that the fabric is evenly laid between the moving mold parting surface 11 and the fixed mold parting surface 21. Then the moving mold 1 and the fixed mold 2 close. At this time, the cutting edge 4 on the fixed mold parting surface 21 contacts the moving mold parting surface 11. The cutting edge 4 cuts the fabric located between the moving mold parting surface 11 and the fixed mold parting surface 21, so that the cut fabric is evenly distributed along the edge of the part. Thus, the cutting of the edge-wrapping fabric of the part can be achieved simultaneously during the injection molding process of the part.

[0027] Example 2:

[0028] This embodiment is a further optimization based on Embodiment 1, such as... Figure 1 and Figure 2 As shown, fabric gaps 5 are provided on both sides of the cutting edge 4. By providing fabric gaps 5 on both sides of the cutting edge 4, when the cutting edge 4 contacts the moving mold parting surface 11 to cut the fabric, the fabric gaps 5 can provide deformation space for the fabric, thus avoiding the situation where the fabric accumulates at the cutting edge 4 and becomes difficult to cut.

[0029] Furthermore, a product forming cavity 7 is provided between the moving mold 1 and the fixed mold 2, and the product forming cavity 7 is connected to the fabric gap 5. The product forming cavity 7 is connected to the injection port of the injection molding machine, and the edge of the product forming cavity 7 is connected to the fabric gap 5, which ensures that the product inside the product forming cavity 7 can be connected to the cut fabric at the edge of the part after forming.

[0030] Furthermore, such as Figure 2 As shown, the fabric gap 5 includes a proximal gap 51 near the product forming cavity 7 and a distal gap 52 away from the product forming cavity 7. The width of the proximal gap 51 gradually decreases along the direction from the cutting edge 4 towards the product forming cavity 7. Since the fabric inside the proximal gap 51 is subjected to compressive forces from both the cutting edge 4 and the product forming cavity 7, and the compressive force from the cutting edge 4 is much greater than that from the product forming cavity 7, the width of the proximal gap 51 is set to gradually decrease along the direction from the cutting edge 4 towards the product forming cavity 7. This ensures that the fabric in the proximal gap 51 has room for deformation during the cutting process by the cutting edge 4, and avoids the fabric from accumulating and being compressed at the cutting edge 4.

[0031] Furthermore, the width of the fabric gap 5 is one-fifth to one-third of the width of the product forming cavity 7.

[0032] The other parts of this embodiment are the same as those in Embodiment 1, so they will not be described again.

[0033] Example 3:

[0034] This embodiment is a further optimization based on the above embodiment 1 or 2, such as... Figure 5 As shown, the cutting edge 4 is provided with a transition arc segment 6 at the corner of the parting line. The parting line will produce a corner at the intersection of the parting surfaces. For example, a corner of the parting line will be produced at the intersection of the horizontal parting surface and the vertical parting surface. In order to ensure that the cutting edge 4 can smoothly cut the fabric at the corner of the parting line, a transition arc segment 6 is provided at the corner of the cutting edge 4 to avoid the cutting edge 4 from having a square corner.

[0035] Furthermore, the transition arc segment 6 extends toward the mold parting surface 21.

[0036] The other parts of this embodiment are the same as those in Embodiment 1 or 2 above, so they will not be described again.

[0037] Example 4:

[0038] This embodiment is a further optimization based on any one of embodiments 1-3 above, such as... Figure 3As shown, the fabric hanging needle 3 is disposed on the side of the moving mold parting surface 11 away from the molded part, and the outer edge of the fabric hanging needle 3 is either spaced apart from or in contact with the edge of the moving mold parting surface 11. If the outer edge of the fabric hanging needle 3 is spaced apart from the edge of the moving mold parting surface 11, the gap width is less than or equal to 1-2 mm. If the outer edge of the fabric hanging needle 3 is in contact with the edge of the moving mold parting surface 11, the width of the outer edge of the fabric hanging needle 3 extending into the interior of the edge of the moving mold parting surface 11 is less than or equal to 1-2 mm.

[0039] The other parts of this embodiment are the same as any one of the embodiments 1-3 above, so they will not be described again.

[0040] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A mold for automatically cutting fabric at a parting surface, comprising a moving mold (1) and a fixed mold (2), characterized in that, The moving mold (1) includes a moving mold parting surface (11), and the fixed mold (2) includes a fixed mold parting surface (21). A hanging needle (3) extending toward the fixed mold (2) is provided on one side of the moving mold parting surface (11). A cutting edge (4) protruding toward the moving mold (1) is provided on the fixed mold parting surface (21) along the parting line. The cutting edge (4) contacts the moving mold parting surface (11).

2. The mold for automatically cutting fabric at the parting surface according to claim 1, characterized in that, Fabric gaps (5) are provided on both sides of the blade (4).

3. The mold for automatically cutting fabric at the parting surface according to claim 2, characterized in that, A product forming cavity (7) is provided between the moving mold (1) and the fixed mold (2), and the product forming cavity (7) is connected to the fabric gap (5).

4. The mold for automatically cutting fabric at the parting surface according to claim 3, characterized in that, The fabric gap (5) includes a proximal gap (51) close to the product forming cavity (7) and a distal gap (52) far from the product forming cavity (7). The width of the proximal gap (51) gradually decreases along the direction from the blade (4) toward the product forming cavity (7).

5. The mold for automatically cutting fabric at the parting surface according to claim 4, characterized in that, The width of the fabric gap (5) is one-fifth to one-third of the width of the product forming cavity (7).

6. A mold for automatically cutting fabric at the parting surface according to any one of claims 1-5, characterized in that, The cutting edge (4) has a transition arc segment (6) at the corner of the parting line.

7. A mold for automatically cutting fabric at the parting surface according to claim 6, characterized in that, The transition arc segment (6) extends toward the mold parting surface (21).

8. A mold for automatically cutting fabric at the parting surface according to any one of claims 1-5, characterized in that, The hanging needle (3) is located on the side of the moving mold parting surface (11) away from the molded part.

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