Felt forming die

Abstract

The utility model belongs to the technical field of blanking dies, and particularly relates to a felt forming die which comprises a die body and an edge cutting structure, the die body comprises an upper die and a lower die, a die cavity is arranged in the upper die, the edge cutting structure comprises an edge cutting blade, and the edge cutting blade is arranged on the edge of the die cavity. And in the die assembly process of the upper die and the lower die, the edge cutting blade and the surface, facing the upper die, of the lower die generate relative dislocation or extrusion. The die further comprises a hollow-out cutting mechanism, the hollow-out cutting mechanism comprises an upper cutting edge located on the upper die and a lower cutting edge located on the lower die, the upper cutting edge and the lower cutting edge are opposite when the upper die and the lower die are closed, one side or two sides of the upper cutting edge or the lower cutting edge are provided with first slow cutting parts, and the first slow cutting parts are not higher than the cutting edges. The felt cutting device can efficiently cut the felt from the inside and the edge when the felt is formed through a mold.

Description

Technical Field

[0001] The utility model belongs to the technical field of punching and cutting dies, and in particular relates to a felt forming die. Background Art

[0002] To make parts from felt, the fibers are usually made into sheets first, and then the sheets are heated and pressed into shape. For felt parts made by hot pressing, the sheets must be larger than the felt parts, otherwise the felt parts cannot be fully formed, and therefore the excess parts on the felt parts need to be removed: for flat felt parts (the whole is flat and the edges are straight), flat die cutting is usually used for trimming; while trimming of complex curved edges requires more complex processes, such as five-axis engraving machines.

[0003] The trimming process of felt parts after hot pressing undoubtedly increases the cost significantly. Not only does the efficiency of trimming is much lower than that of hot pressing, which greatly limits the output of felt parts, but if the parts also include hollow parts, they have to be cut again, which further reduces the efficiency and output, and the yield rate cannot be guaranteed. Utility Model Content

[0004] The utility model aims to provide a felt forming mould, which can efficiently cut the felt when the felt is formed by the mould.

[0005] In order to achieve the above-mentioned purpose, the scheme of the utility model is: a felt forming mold, including a mold body and an edge cutting structure, the mold body includes an upper mold and a lower mold, a mold cavity is provided in the upper mold, the edge cutting structure includes an edge cutting blade, and the edge cutting blade is arranged at the edge of the mold cavity. During the mold closing process of the upper mold and the lower mold, the edge cutting blade and the surface of the lower mold facing the upper mold are relatively displaced or squeezed.

[0006] Optionally, the edge cutting blade is detachably connected to the upper mold or is integrally formed with the upper mold.

[0007] Optionally, it also includes a cutting mechanism, which includes an upper cutting blade located on the upper mold and a lower cutting blade located on the lower mold. When the upper mold and the lower mold are closed, the upper cutting blade and the lower cutting blade face each other. A first relief cutting portion is provided on one side or both sides of the upper cutting blade or the lower cutting blade, and the height of the first relief cutting portion is not higher than the blade height.

[0008] Optionally, the first slow-cut portion has two sides that smoothly transition to the hollowing mechanism and the mold body respectively; the edge cutting structure is provided with a second slow-cut portion, and the second slow-cut portion has two sides that smoothly transition to the edge cutting mechanism and the mold body respectively.

[0009] Optionally, the cutting edges of the upper cutting edge and the lower cutting edge are flat edges.

[0010] Optionally, a pre-pressing structure is also included, and the pre-pressing mechanism includes a pre-pressing part arranged on the circumferential outer side of the upper mold cavity of the upper mold and a pre-pressing groove arranged on the upper position of the lower mold corresponding to the pre-pressing part. The pre-pressing part and the pre-pressing groove form a pre-pressing cavity after the upper mold and the lower mold are closed.

[0011] Optionally, the edge of the pre-compression cavity facing the peripheral cutting edge has a rounded chamfer.

[0012] Optionally, a plurality of flow channels are provided in the mold body, and the flow channels are interconnected.

[0013] Optionally, a pressure dividing mechanism is also included, which includes a pressure dividing plate, a cavity is provided in the pressure dividing plate, a plurality of through holes are opened on one side of the pressure dividing plate, the through holes are connected to the cavity, and a plunger is slidably connected in the through holes.

[0014] Optionally, a positioning block is installed on the upper mold, and a positioning groove cooperating with the positioning block is opened on the lower mold. After the upper mold and the lower mold are molded together, the gap between the positioning block and the positioning groove is no more than 0.5 mm.

[0015] In the utility model, the edge cutting blade is arranged on the mold body, and during the mold closing process of the upper mold and the lower mold, the edge cutting blade and the surface of the lower mold facing the upper mold are relatively displaced to form a shearing effect. After the upper mold and the lower mold are closed, the distance between the edge cutting blade and the upper surface of the lower mold is small enough to cut off the felt fibers exceeding the edge of the mold cavity. Moreover, the edge cutting blade is particularly good at cutting the edge of the curved surface, that is, the normal line of the edge has a certain angle with the mold closing displacement direction, and the angle is best at 90 degrees.

[0016] Moreover, for the hollow part of the felt part, by setting a first slow-cutting part with a smooth transition on both sides of the upper cutting edge and the lower cutting edge, not only can cracks be avoided at the cutting point, but also the material properties of the felt fiber sheet can be utilized to gradually guide the surface material of the multi-layer structure of the felt fiber sheet at the cutting point and cover the fracture, so that the fracture is always consistent with the appearance of the surface of the felt fiber sheet, and there will be no color difference, thereby making the fracture and the entire felt part more beautiful.

[0017] Moreover, the pre-compression structure extends through the felt fiber sheet into the pre-compression structure, thereby tightening the entire felt fiber sheet to prevent wrinkles from forming on the felt fiber sheet after being compressed.

[0018] After adopting the pressure dividing mechanism, the pressure of the mold clamping pressure cylinder can be evenly distributed or unevenly distributed to the mold body according to the pressure requirements, thereby ensuring the molding quality of the felt parts.

[0019] More importantly, the utility model balances the processing efficiency, processing cost and processing quality of felt parts, which not only greatly improves the processing efficiency and reduces the processing cost, but also ensures the aesthetics of the felt parts. It not only solves the production problems of felt parts, but also ensures that they can be used as decorative parts, which greatly promotes the promotion and application of felt parts in various fields such as automobiles, luggage, and pet supplies. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is an axonometric view of the felt forming mold in the first embodiment of the utility model;

[0021] Figure 2 It is a cross-sectional view of the felt forming mold in the first embodiment of the utility model;

[0022] Figure 3 for Figure 2 The enlarged view of point A in the middle;

[0023] Figure 4 for Figure 2 The enlarged view of point B in the middle;

[0024] Figure 5 This is a schematic structural diagram of a pressure dividing mechanism in a felt forming mold in Embodiment 2 of the present utility model;

[0025] Figure 6 It is a partial structural schematic diagram of the cutting mechanism in the felt forming mold in the second embodiment of the utility model;

[0026] Figure 7 It is a partial cross-sectional view of the edge cutting mechanism in the third embodiment of the present utility model. DETAILED DESCRIPTION

[0027] The following is further described in detail through specific implementation methods:

[0028] The marks in the drawings of the specification include: upper mold 1, lower mold 2, mold cavity 3, edge cutting edge 4, upper cutting edge 5, lower cutting edge 6, first slow cutting portion 7, positioning block 8, pre-pressing portion 9, pre-pressing groove 10, pre-pressing cavity 11, flow channel 12, pressure dividing plate 13, plunger 14, discharge hole 15, second slow cutting portion 16. Embodiment 1

[0029] This embodiment is basically Figure 1 , Figure 2As shown: the felt forming mold includes a mold body, an edge cutting structure and a hollowing mechanism. The mold body includes an upper mold and a lower mold, and a mold cavity is provided in the upper mold. The upper mold is usually a movable mold, and the lower mold is usually a fixed mold. After the felt fiber sheet is heated, it is placed between the upper mold and the lower mold. The sheet covers the mold cavity, and the edges of the sheet all extend beyond the mold cavity and extend between the pre-tightening structures. An edge cutting blade is integrally formed along the circumferential edge of the mold cavity on the upper mold, and the edge cutting blade and the upper surface of the lower mold together constitute an edge structure. In other embodiments, the edge cutting blade is inlaid or connected to the upper mold by screws, so that it is convenient to remove the edge cutting blade and grind the cutting edge. During the closing process of the upper mold and the lower mold, the edge cutting blade and the surface of the lower mold facing the upper mold undergo relative displacement, extrusion, or a combined movement of displacement and extrusion, that is, when the upper mold is approaching the lower mold, when the normal of the edge of the felt part ( Figure 2 When the dotted line in the figure is parallel to the mold displacement direction (vertical direction in this embodiment), the movement between the edge cutting edge and the lower mold is extrusion; when the angle between the normal line of the edge of the felt part and the mold displacement direction is 90°, the movement between the edge cutting edge and the lower mold is shear-like relative displacement; when the angle between the normal line of the edge of the felt part and the mold displacement direction is greater than 0° and less than 90°, the movement between the edge cutting edge and the lower mold is a composite movement of relative displacement and extrusion. In other embodiments, the lower mold may also be provided with a structure that is the same or similar to the edge cutting edge, which cooperates with the edge cutting edge to form a shearing effect on the sheet near the edge of the mold cavity.

[0030] The felt parts in this embodiment also include hollow holes, so this embodiment also includes a cutting mechanism, such as the attached Figure 4As shown, the cutting mechanism includes an upper cutting blade located on the upper mold and a lower cutting blade located on the lower mold. The cutting edges of the upper cutting blade and the lower cutting blade are flat blades. The flat blades squeeze and break the sheet during the mold closing process. Compared with the sharp blades, the probability of flash can be reduced, and the curling defects that often occur in the sharp blades can be avoided. When the upper mold and the lower mold are closed, the upper cutting blade and the lower cutting blade face each other. The two sides of the upper cutting blade and the one side of the lower cutting blade are provided with a first slow-cutting portion 7, and the height of the first slow-cutting portion 7 is not higher than the blade height. The blade height is the height of the upper cutting blade relative to the mold cavity and the lower cutting blade relative to the upper surface of the lower mold. The two sides of the first slow-cutting portion 7 are smoothly transitioned with the cutting mechanism and the arc surface of the mold body respectively. Due to the influence of its material properties during the approach of the upper cutting blade and the lower cutting blade, the felt fiber sheet will be pulled by the upper cutting blade and the lower cutting blade. First, cracks are likely to appear near the cut point, and second, if the felt fiber sheet is a multi-layer structure, the middle layer structure is likely to be exposed after cutting. After the first slow-cutting portion 7 with a smooth transition is set on both sides of the upper cutting edge and the lower cutting edge, not only can cracks be avoided at the cutting point, but also the material properties of the felt fiber sheet can be used to gradually squeeze, stretch and cover the surface material of the multi-layer felt fiber sheet at the cutting point, so that the fracture is always consistent with the appearance of the surface of the felt fiber sheet without color difference, thereby making the fracture and the entire felt part more beautiful.

[0031] Also includes pre-compression structure, such as attached Figure 3 As shown, the pre-pressing mechanism includes a pre-pressing portion arranged on the circumferential outer side of the upper mold cavity of the upper mold and a pre-pressing groove arranged on the upper position of the lower mold corresponding to the pre-pressing portion. The pre-pressing portion and the pre-pressing groove form a pre-pressing cavity after the upper mold and the lower mold are closed. During the closing process, the pre-pressing portion extends through the felt fiber sheet into the pre-pressing structure to tighten the entire felt fiber sheet to prevent wrinkles on the felt fiber sheet after being pressed. The edge of the pre-pressing cavity facing the edge cutting blade has a rounded chamfer. When cutting the edge of the felt part, the edge cutting blade will pull the felt fiber sheet and partially slide. The rounded chamfer can prevent scratches on the felt fiber sheet during the sliding process.

[0032] The mold body is provided with a number of flow channels, which are interconnected. Cooling liquid is introduced into the flow channels to cool the mold body, thereby accelerating the cooling efficiency of the felt fiber sheet, allowing the felt parts to be formed in the mold cavity faster, and also avoiding the mold temperature from being too high, which affects the processing accuracy and, in turn, the aesthetics of the felt parts. A positioning block is installed on the upper mold, and a positioning groove is provided on the lower mold to cooperate with the positioning block. After the upper and lower molds are closed, the gap between the positioning block and the positioning groove is less than 0.1mm. During the closing process, the cooperation of the positioning block and the positioning groove can avoid the upper and lower molds from being misaligned, and the upper and lower cutting edges from being misaligned, which affects the fracture quality and aesthetics. Embodiment 2

[0033] The difference between this embodiment and the first embodiment is that it also includes a voltage dividing mechanism, such as the attached Figure 5 As shown, the pressure-dividing mechanism includes a pressure-dividing plate, a cavity is provided in the pressure-dividing plate, and a plurality of through holes are opened on one side of the pressure-dividing plate, the through holes are connected to the cavity, and a plunger is slidably connected in the through hole. Since the mold closing is usually performed by a single pressure oil cylinder, the pressure on the mold gradually decreases from the pressure center from the inside to the outside, resulting in uneven pressure, which affects the molding quality of the felt parts. Moreover, for a mold body with a thinner thickness, the mold body may also be warped and deformed, which also affects the molding quality of the felt parts. After adopting the pressure-dividing mechanism in this embodiment, the pressure of the pressure oil cylinder can be evenly distributed to the mold body to ensure the molding quality of the felt parts. In other embodiments, if the felt parts have a complex curved surface structure or uneven thickness, the cavity distribution position and the diameter and sliding direction of the plunger are adjusted, or some through holes are blocked, so that the pressure is unevenly distributed to the mold (especially the mold cavity part) as needed, thereby ensuring the molding quality of such felt parts.

[0034] In this embodiment, only the first slow cutting portion 7 is provided on both sides of the upper cutting edge, and the cutting edges of the upper cutting edge and the lower cutting edge are stepped flat edges. Figure 6 As shown, a discharge hole is provided between the two lower cutting edges, which can not only ensure the fracture quality to a certain extent, but also allow the felt material cut off from the hollow part to be automatically discharged from the mold body through the discharge hole. Embodiment 3

[0035] The difference between this embodiment and the second embodiment is that: Figure 7 As shown, the edge cutting blade 4 of the edge cutting structure is provided with a second slow cutting portion 16 along the circumferential edge, and the two sides of the second slow cutting portion 16 are smoothly transitioned with the edge cutting mechanism and the mold body respectively. The second edge cutting portion 16 can further ensure the edge fracture quality.

[0036] The above is only an embodiment of the utility model, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the utility model. The specific implementation methods and other records in the specification can be used to explain the content of the claims.

Claims

1. Felt forming mold, characterized by: The invention comprises a mould body and an edge cutting structure. The mould body comprises an upper mould and a lower mould. A mould cavity is arranged in the upper mould. The edge cutting structure comprises an edge cutting blade. The edge cutting blade is arranged at the edge of the mould cavity. During the mould closing process between the upper mould and the lower mould, the edge cutting blade and the surface of the lower mould facing the upper mould are relatively displaced or squeezed.

2. The felt forming mold according to claim 1, characterized in that: The edge cutting blade and the upper mold can be detachably connected or integrally formed.

3. The felt forming mold according to claim 1, characterized in that: It also includes a cutting mechanism, which includes an upper cutting blade located on the upper mold and a lower cutting blade located on the lower mold. When the upper mold and the lower mold are closed, the upper cutting blade and the lower cutting blade face each other. A first relief cutting portion is provided on one side or both sides of the upper cutting blade or the lower cutting blade, and the height of the first relief cutting portion is not higher than the blade height.

4. The felt forming mold according to claim 3, characterized in that: The first slow-cutting part has two sides that smoothly transition to the hollowing mechanism and the mold body respectively; the edge cutting structure is provided with a second slow-cutting part, and the second slow-cutting part has two sides that smoothly transition to the edge cutting mechanism and the mold body respectively.

5. The felt forming mold according to claim 4, characterized in that: The cutting edges of the upper cutting edge and the lower cutting edge are flat.

6. The felt forming mold according to claim 1, characterized in that: It also includes a pre-pressing structure, which includes a pre-pressing part arranged on the circumferential outer side of the upper mold cavity of the upper mold and a pre-pressing groove arranged on the upper position of the lower mold corresponding to the pre-pressing part. The pre-pressing part and the pre-pressing groove form a pre-pressing cavity after the upper mold and the lower mold are closed.

7. The felt forming mold according to claim 6, characterized in that: The edge of the pre-compression cavity facing the edge cutting edge has a round chamfer.

8. The felt forming mold according to claim 1, characterized in that: A plurality of flow channels are arranged in the mold body, and the flow channels are interconnected.

9. The felt forming mold according to claim 1, characterized in that: It also includes a pressure dividing mechanism, which includes a pressure dividing plate, a cavity is arranged in the pressure dividing plate, a plurality of through holes are opened on one side of the pressure dividing plate, the through holes are connected to the cavity, and a plunger is slidably connected in the through holes.

10. The felt forming mold according to claim 1, characterized in that: A positioning block is installed on the upper mold, and a positioning groove matched with the positioning block is opened on the lower mold. After the upper mold and the lower mold are molded together, the gap between the positioning block and the positioning groove is no more than 0.5mm.

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