Forming die for batch carbon fiber products

Abstract

The utility model discloses a forming die for batch carbon fiber products, which is used for solving the technical problems of long manufacturing time and high cost of carbon fiber sheets, and belongs to the technical field of composite material forming. The die comprises a lower die body, a mandrel and an upper die body, the lower die body is a rectangular plate, the four corners of the lower die body are each provided with a threaded hole, and a plurality of counter bore grooves are formed in the portion, inside a rectangle formed by the four threaded holes, of the lower die body; the mandrel is provided with a head cylinder, the counter bore groove is a stepped hole, the height of the head cylinder is smaller than that of a large-diameter hole of the stepped hole, and the diameter of the head cylinder is smaller than that of the large-diameter hole of the stepped hole and larger than that of a small-diameter hole of the stepped hole. The upper die is a rectangular plate, through holes corresponding to the lower die are formed in the four corners of the upper die, and the upper die and the lower die are fixed through bolts.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the composite material forming technical field, especially relates to a batch carbon fiber product forming die. BACKGROUND

[0002] In a certain type multifunctional standard display console, metal parts are fixed on the display console carbon fiber shell by screws, nuts and washers, and the carbon fiber parts also need to be connected and fixed by screws and nuts. These screws will form screw holes on the outer surface of the carbon fiber product, and the screw holes need to be filled and polished, but defects will be found on the surface after polishing, and the surface quality is poor. In order to solve this problem, after the screw is fixed in the screw hole, the screw head and the outer surface of the fiber product form a 1mm height difference, and the carbon fiber sheet is bonded in the height difference range by using epoxy resin adhesive, and the thickness of the adhesive layer of the bonded carbon fiber sheet is required to be less than or equal to 0.1mm, and the surface is covered with glass fiber cloth, and the surface is polished after normal temperature curing. By bonding the carbon fiber sheet outside the screw hole, the surface quality problem of the screw hole on the outer surface of the carbon fiber product is solved, so that the outer surface of the carbon fiber product is smooth and smooth, and the appearance quality is high.

[0003] The number of screws required for the carbon fiber product is large, so the number of carbon fiber sheets required is also large, and the existing technology for making carbon fiber sheets is to mechanically process the required carbon fiber sheets on a whole carbon fiber carbon plate by using a carving machine. This method takes a long time to make carbon fiber sheets, and the cost is high. INVENTION CONTENTS

[0004] The utility model aims at providing a batch carbon fiber product forming die, which solves the technical problems of long carbon fiber sheet manufacturing time and high cost.

[0005] The utility model is implemented by the following technical scheme:

[0006] A batch carbon fiber product forming die, comprising a lower die, a core shaft and an upper die, the lower die is a rectangular plate, a threaded hole is arranged at each corner of the lower die, and a plurality of counterbore grooves are arranged inside the rectangle formed by the four threaded holes.

[0007] The core shaft is provided with a head cylinder, the counterbore groove is a stepped hole, the height of the head cylinder is less than the height of the large diameter hole of the stepped hole, and the diameter of the head cylinder is less than the diameter of the large diameter hole of the stepped hole.

[0008] The upper die is a rectangular plate, a through hole corresponding to the lower die is arranged at each corner of the upper die, and the upper die and the lower die are fixed by bolts.

[0009] In application, first, the mandrel is placed into the counterbore groove on the upper surface of the lower mold, then the carbon fiber prepreg is laid on the upper surface of the mandrel. After laying, the upper mold and the lower mold are closed and fastened with bolts, and placed in the hot press for heating and pressurizing. After the molding and curing are completed, the mold is taken out, the bolts are loosened, the upper mold and the lower mold are separated, and the mandrel in the lower mold is taken out. At this time, the carbon fiber sheet is on the upper surface of the mandrel.

[0010] Further preferably, it further comprises an ejection shaft, the mandrel is provided with a tail cylinder, the head cylinder has a diameter larger than that of the tail cylinder, the head cylinder and the tail cylinder are coaxially arranged, and the diameter of the tail cylinder is smaller than that of the small-diameter hole of the stepped hole.

[0011] Further preferably, one end of the ejection shaft is provided as a large cylinder, the large cylinder extends a small cylinder, the large cylinder and the small cylinder are coaxially arranged, and the diameter of the small cylinder is smaller than that of the tail cylinder.

[0012] Further preferably, it further comprises a release cloth, the top surface of the head cylinder is provided with the release cloth, in order to facilitate the release between the carbon fiber sheet and the mandrel, the top surface of the head cylinder is provided with the release cloth, and in application, the release cloth is laid on the upper surface of the mandrel after the mandrel is placed into the counterbore groove on the upper surface of the lower mold, and then the carbon fiber prepreg is laid on the upper surface of the mandrel.

[0013] Further preferably, the diameter of the release cloth is larger than that of the top surface of the head cylinder, in order to facilitate the release between the mandrel and the upper mold, the diameter of the release cloth is larger than that of the top surface of the head cylinder, the release cloth fills the large-diameter hole of the stepped hole, and the carbon fiber prepreg will not flow away from the gap between the head cylinder and the stepped hole after heating.

[0014] Further preferably, the lower surface of the upper mold is provided with a release agent, in order to facilitate the release between the carbon fiber sheet and the upper mold, the lower surface of the upper mold is provided with the release agent, and in application, the release agent is applied on the lower surface of the upper mold when the mold is closed.

[0015] Further preferably, the through hole of the upper mold is a counterbore, and the bolt is a countersunk head hexagonal bolt.

[0016] Further preferably, the mandrel cooperates with the gap of the stepped hole, facilitating the release between the mandrel and the lower mold.

[0017] Further preferably, after the mandrel is placed into the counterbore groove, the upper surface of the mandrel is at a thickness of a carbon fiber sheet from the upper surface of the lower mold.

[0018] The utility model discloses can form hundreds of carbon fiber sheets at one time, not only shorten the time, reduce the cost, improve the efficiency, solve the problem of the required carbon fiber quantity is much, reduce the production cost, improve production efficiency, guarantee the production progress. BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings incorporated in the specification hereof and forming a part thereof illustrate embodiments that conform to the present application and, together with the description, serve to explain the principles of the present application.

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced hereinafter. Obviously, those skilled in the art can obtain other drawings according to these drawings without any creative effort.

[0021] Figure 1 The present application structure schematic diagram is shown.

[0022] Figure 2 The present application lower die structure schematic diagram is shown.

[0023] Figure 3 The present application mandrel structure schematic diagram is shown.

[0024] Figure 4 The present application upper die schematic diagram is shown.

[0025] Figure 5 The present application ejector shaft structure schematic diagram is shown.

[0026] Figure 6 The present application carbon fiber sheet structure schematic diagram is shown.

[0027] In the drawings: 1-lower die, 11-threaded hole, 12-boss groove, 2-mandrel, 21-head cylinder, 22-tail cylinder, 3-upper die, 31-through hole, 32-bolt, 4-ejector shaft, 5-carbon fiber sheet. DETAILED DESCRIPTION

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced hereinafter. Obviously, those skilled in the art can obtain other drawings according to these drawings without any creative effort.

[0029] In the description, it should be noted that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. It should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0030] Many specific details are set forth in the following description in order to provide a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of the present invention, and not all embodiments.

[0031] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0032] Example 1: A molding die for mass production of carbon fiber products includes a lower die 1, a mandrel 2, and an upper die 3. The lower die 1 is a rectangular plate. The lower die 1 has a threaded hole 11 at each of its four corners. The lower die 1 has a plurality of countersunk grooves 12 arranged inside the rectangle formed by the four threaded holes 11.

[0033] The mandrel 2 is provided with a head cylinder 21 and a countersunk groove 12 is a stepped hole. The height of the head cylinder 21 is less than the height of the large diameter hole of the stepped hole, and the diameter of the head cylinder 21 is less than the large diameter hole of the stepped hole and greater than the small diameter hole of the stepped hole.

[0034] The upper mold 3 is a rectangular plate. The upper mold 3 has through holes 31 at the four corners that correspond to the lower mold 1. The upper mold 3 and the lower mold 1 are fixed together by bolts 32.

[0035] It also includes a release cloth, which is provided on the top surface of the head cylinder 21. The diameter of the release cloth is larger than the diameter of the top surface of the head cylinder 21.

[0036] A release agent is applied to the lower surface of the upper mold 3.

[0037] The upper mold has a through hole 31 which is a countersunk hole, and bolt 32 is a countersunk hexagon socket head cap bolt 32.

[0038] After the mandrel 2 is placed into the countersunk groove 12, the distance between the upper surface of the mandrel 2 and the upper surface of the lower mold 1 is the thickness of a carbon fiber sheet 5.

[0039] Working principle:

[0040] The lower mold 1 inserts the mandrel 2 into the countersunk groove 12 from the upper surface. The large-diameter hole of the countersunk groove 12 is on the upper surface of the lower mold 1.

[0041] The head cylinder 21 is inserted into the large-diameter hole of the countersunk groove 12, and the top surface size of the head cylinder 21 is the same as the required carbon fiber sheet 5.

[0042] The release cloth is placed between the carbon fiber prepreg and the top surface of the mandrel 2. The diameter of the release cloth is larger than the diameter of the head cylinder 21, which is equal to the large diameter of the stepped hole. This can be used to prevent the carbon fiber prepreg from flowing into the stepped hole after heating.

[0043] The lower surface of the upper mold 3 is coated with a release agent to facilitate the demolding of the carbon fiber sheet 5.

[0044] In use, first lay a layer of release cloth on the upper surface of the mandrel 2, place the mandrel 2 into the counterbore groove 12 on the upper surface of the lower mold 1, then lay the carbon fiber prepreg of the desired thickness on the upper surface of the mandrel 2, in this embodiment the carbon fiber prepreg is cut into a piece with the same size as the top surface of the mandrel 2 and the number of pieces is equal to the number of mandrels 2, after laying and pasting, apply release agent to the upper mold 3, clamp the upper mold 3 and the lower mold 1 together and fasten with hexagonal bolts 32, place in a hot press for heating and pressing. After the molding and curing are completed, remove the mold, loosen the bolts 32, separate the upper mold from the lower mold 1, remove the mandrel 2 from the lower mold 1, and remove the carbon fiber sheet 5 from the mandrel 2, polish the flash around the carbon fiber sheet 5 to obtain the desired carbon fiber sheet 5.

[0045] The lower mold 1 of this embodiment has 25 rows and 29 columns of counterbore grooves 12, and can form 725 carbon fiber sheets 5 at a time, solving the problem of the number of carbon fiber sheets 5 required in batches, and the number of carbon fiber sheets 5 required can be controlled by changing the number of counterbore grooves 12 and mandrels 2 in the lower mold 1.

[0046] In the second embodiment, the mandrel 2 is provided with a tail cylinder 22, and the head cylinder 21 has a diameter greater than that of the tail cylinder 22, and the head cylinder 21 and the tail cylinder 22 are coaxially arranged, and the tail cylinder 22 has a diameter smaller than that of the small diameter hole of the stepped hole, and the ejector shaft 4 has a diameter equal to or smaller than that of the tail cylinder 22.

[0047] The ejector shaft 4 is provided at one end with a large cylinder, the large cylinder extends a small cylinder, and the large cylinder and the small cylinder are coaxially arranged, and the small cylinder has a diameter smaller than that of the tail cylinder 22.

[0048] Working principle:

[0049] The tail cylinder 22 is used to stabilize the head cylinder 21, making the mandrel 2 more stable in the counterbore groove 12, and facilitating the ejection of the mandrel 2 by the ejector shaft 4.

[0050] The carbon fiber prepreg has a certain fluidity after heating, and after curing, the mandrel 2 may be stuck in the stepped hole, at which time the ejector shaft 4 can be inserted into the lower mold 1 from the small diameter hole side of the stepped hole, and the mandrel 2 in the lower mold 1 can be ejected by hammering the ejector shaft 4.

[0051] The above is only a specific embodiment of the present application, enabling those skilled in the art to understand or implement the present application. Although detailed descriptions are made with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions described in the foregoing embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not cause the essence of the corresponding technical solution to deviate from the scope of the technical solutions of the embodiments, and they should be covered by the protection scope of the claims.

Claims

1. A forming mold for batch production of a carbon fiber product, characterized by: Including lower die (1), mandrel (2), upper die (3), the lower die (1) is a rectangular plate, the lower die (1) is provided with a threaded hole (11) at the position of four corners, the lower die (1) is arranged with several counterbore grooves (12) inside the rectangle formed by the four threaded holes (11); The mandrel (2) is provided with a head cylinder (21), the counterbore groove (12) is a stepped hole, the height of the head cylinder (21) is less than the height of the large diameter hole of the stepped hole, and the diameter of the head cylinder (21) is less than the large diameter hole of the stepped hole is greater than the small diameter hole of the stepped hole; The upper die (3) is a rectangular plate, the upper die (3) is provided with a through hole (31) corresponding to the lower die (1) at the position of four corners, and the upper die (3) and the lower die (1) are fixed by bolts (32).

2. A batch carbon fiber product forming mold according to claim 1, characterized by: It also includes an ejection shaft (4), the mandrel (2) is provided with a tail cylinder (22), the diameter of the head cylinder (21) is greater than the tail cylinder (22), the head cylinder (21) and the tail cylinder (22) are coaxially arranged, the diameter of the tail cylinder (22) is less than the small diameter hole of the stepped hole, and the diameter of the ejection shaft (4) is less than or equal to the diameter of the tail cylinder (22).

3. A batch carbon fiber article forming mold according to claim 2, characterized by: One end of the ejection shaft (4) is provided as a large cylinder, the large cylinder extends a small cylinder, the large cylinder and the small cylinder are coaxially arranged, and the diameter of the small cylinder is less than the diameter of the tail cylinder (22).

4. A batch carbon fiber product forming mold according to claim 1, characterized by: It also includes a release cloth, the top surface of the head cylinder (21) is provided with a release cloth.

5. A batch carbon fiber article forming mold according to claim 4, characterized by: The diameter of the release cloth is greater than the diameter of the top surface of the head cylinder (21).

6. A forming tool for batch production of carbon fibre products according to any one of claims 1 to 5, characterised in that: The lower surface of the upper die (3) is provided with a release agent.

7. A batch carbon fiber product forming mold according to any one of claims 1 to 5, characterized in that: The through hole (31) of the upper die (3) is a counterbore, and the bolt (32) is a countersunk head hexagonal bolt (32).

8. A batch carbon fiber product forming mold according to any one of claims 1 to 5, characterized in that: The mandrel (2) is matched with the stepped hole gap.

9. A batch carbon fiber product forming mold according to any one of claims 1 to 5, characterized in that: After the mandrel (2) is put into the counterbore groove (12), the upper surface of the mandrel (2) is away from the upper surface of the lower die (1) by the thickness of a carbon fiber sheet (5).

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