CN106113527A - A kind of fiber placement equipment synchronizes, to pre-soaking fiber tow, the device that clamping is sheared - Google Patents

Abstract

A device for synchronous clamping and shearing of prepreg fiber tow in fiber laying equipment, including a guide base with a channel for prepreg fiber tow, and above the guide base are arranged side by side along the feeding direction of prepreg fiber tow A clamping device and a shearing device are provided; the clamping device includes a clamping guide block equipped with a compression spring, and the compression spring is vertically connected downwards through a guide rod to a clamping head for clamping the prepreg fiber tow; The shearing device comprises a shearing knife frame with a blade installed at the bottom, the shearing knife frame is fixed together with the top of the clamping guide block, and is connected with a linear displacement driving device capable of simultaneously controlling both of them to lift. The top side of the clamping guide block is provided with a tenon groove, and the top side of the shearing tool holder is provided with a tenon platform. The clamping guide block matches the tenon groove and the tenon platform on the top of the shearing tool holder and is fixed by connecting bolts. The invention integrates the clamping and shearing of the prepreg fiber tow, simplifies the overall control process, and realizes continuous laying and shearing.

Description

A device for synchronous clamping and shearing of prepreg fiber tow in fiber laying equipment

technical field

The invention relates to the field of resin-based composite material manufacturing, and in particular to a device for synchronously clamping and shearing prepreg fiber tows in fiber laying equipment, which guides the continuously placed prepreg fiber tows through linear displacement driving. Clamping and shearing.

Background technique

The fiber placement device is mainly used in aerospace, shipbuilding, automobile and other industrial manufacturing fields. The resin-based fiber-reinforced composite products produced have high specific strength, high specific modulus, corrosion resistance, fatigue resistance, creep resistance, A series of advantages such as electrical conductivity, thermal conductivity and small thermal expansion coefficient.

Composite material automatic laying machine is mainly used for laying complex high-curvature profile composite material integral components, such as aircraft fuselage section, nose, tail cone, jet engine fairing, air inlet, nozzle, conical tube , compressor blades, and other composite integral components such as oval or "C" shapes. The automatic fiber laying machine for composite materials can individually control multiple bundles of fiber filaments, independently re-feed, clamp and cut control the fiber filaments according to the laying contour shape, and can lay complex curved surfaces with windows. Therefore, for complex components, it is necessary to use a composite material automatic wire laying machine to realize laying and manufacturing. The laying head is the most critical functional part of the automatic laying machine for composite materials. A typical laying head generally includes devices such as guiding, refeeding, clamping, cutting, heating and pressing of prepreg fiber tow, so as to realize fiber laying. Various laying functions of the wire machine.

At present, when the domestic automatic laying machine cuts the prepreg fiber tow, it needs to stop the laying head first, and then restart after cutting to completely lay and press the prepreg fiber tow at the cutting end on the mandrel. superior. This working mode has low laying efficiency and cannot fully reflect the high laying efficiency of the automatic wire laying machine. In order to realize the shearing of the prepreg fiber tow during the continuous laying process, the synchronization of the two actions of clamping and shearing must be well controlled, otherwise there will be excessive tension of the prepreg fiber tow at the moment of shearing Or the phenomenon of rebound, can not be laid normally. In view of the above situation, there is an urgent need to develop a device that utilizes structural design to synchronize clamping and shearing, which can realize the shearing of prepreg fiber tows in the continuous laying process, and can combine the clamping and shearing of the two driving devices. The cutting action is simplified to be driven by a driving device, which simplifies the control process and improves the laying efficiency.

Contents of the invention

The purpose of the present invention is to solve the above-mentioned problems in the prior art, to provide a device for synchronously clamping and shearing the prepreg fiber tow in the fiber laying equipment, so as to realize the continuous laying of the prepreg fiber tow Make a cut.

In order to achieve the above object, the technical solution adopted by the present invention is: comprising a guide base provided with a channel for prepreg fiber tow, above the guide base, a clamping device and a shearing device are arranged side by side along the feeding direction of the prepreg fiber tow. device; the clamping device includes a clamping guide block equipped with a compression spring, and the compression spring is vertically connected downwards through the guide rod to the clamping head for clamping the prepreg fiber tow; the shearing The device comprises a shearing knife frame with a blade installed at the bottom, the shearing knife frame is fixed together with the top of the clamping guide block, and is connected with a linear displacement driving device capable of simultaneously controlling both of them to go up and down.

The top side of the clamping guide block is provided with a tenon groove, and the top side of the shearing tool holder is provided with a tenon platform. The clamping guide block matches the tenon groove and the tenon platform on the top of the shearing tool holder and is fixed by connecting bolts.

There are tenon and groove bar holes vertically on the groove wall of the clamping guide block tenon and groove, and multiple tenon and tenon round holes are opened on the tenon and tenon table of the shearing tool holder to align with the tenon and groove bar holes, and the connecting bolts pass through the tenon and groove at the same time The strip hole and the tenon table round hole fix the clamping guide block and the shearing tool holder.

There are tenon and tenon strip holes vertically on the tenon table of the shearing knife holder, and there are multiple tenon and groove round holes on the groove wall of the clamping guide block aligned with the tenon and tenon table strip holes, and the connecting bolts pass through the tenon and groove at the same time The round hole and the tenon table strip hole fix the clamping guide block and the shearing tool holder.

The top of the clamping guide block is provided with a threaded hole for connecting the linear displacement driving device, and the top of the clamping guide block is installed with an anti-loosening screw for preventing the linear displacement driving device from loosening.

The linear displacement driving device is selected from a cylinder, a linear motor or a linear electromagnetic driving device.

The bottom end of the shearing tool holder is provided with a positioning groove surface for placing the blade, and a cutter head threaded hole for fixing the blade is provided on the positioning groove surface.

The blade is an oblique blade, the inclination angle of the cutting edge is 20°-60°, and the angle of the cutting edge is 10°-45°.

There is a boss at the tail end of the guide rod, and the boss surface cooperates with the compression spring. The end of the clamping guide block is installed with a threaded cover that can hold the boss at the end of the guide rod. The neck of the guide rod passes through the threaded cover to connect to the clamping head. .

Both the clamping head and the surface of the guide base are made of polytetrafluoroethylene.

Compared with the prior art, the present invention has the following beneficial effects: the flow direction of the prepreg fiber tow is guided through the guide base provided with the prepreg fiber tow channel, and the feeding of the prepreg fiber tow along the guide base is The clamping device and the shearing device are arranged side by side in the direction. The shearing knife holder and the top of the clamping guide block are fixed together and controlled by the linear displacement driving device at the same time. After the clamping head contacts the prepreg fiber tow, due to the With the movement of the linear displacement drive device, the compression spring in the clamping guide block is compressed, and as the spring compression increases, the clamping force gradually increases, and the clamping head completes the clamping and fixing of the prepreg fiber tow, and at the same time The blade at the bottom of the shearing tool holder continues to descend, and the prepreg fiber tow is cut off by the blade. The invention can integrate the clamping and shearing of the prepreg fiber tow, simplifies the overall control process, and realizes the shearing of the prepreg fiber tow in the continuous laying process, greatly improving the prepreg fiber Tow placement efficiency.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the clamping and shearing device of the present invention cooperating with the guide base;

Fig. 2 is a cross-sectional view of the overall structure of the clamping and shearing device of the present invention cooperating with the guide base;

Fig. 3 is a structural schematic diagram of the shearing knife holder scheme one of the present invention;

Fig. 4 is a structural schematic diagram of the clamping guide block scheme 1 of the present invention;

Fig. 5 is a structural schematic diagram of the second plan of the shearing tool holder of the present invention;

Fig. 6 is a structural schematic diagram of the second clamping guide block scheme of the present invention;

Fig. 7 (a) the front view structure schematic diagram of blade of the present invention;

Fig. 7 (b) the side view structural representation of blade of the present invention;

Fig. 8 is a schematic diagram of the overall structure of the laying head of the present invention.

In the attached drawings: a. Shear tool holder; b. Connecting bolt; c. Clamping guide block; d. Compression spring; e. Threaded cover; f. Guide rod; g. Clamping head; h. Guide base; i. blade; j. fastening screw; a-1. positioning groove surface; a-2-1. tenon table round hole; a-2-2. tenon table strip hole; c-1-1. Tenon groove strip hole; c-1-2. Tenon groove round hole; c-2. Threaded hole; c-3. Anti-loosening screw hole; c-4. Compression spring installation hole; k. Placement head; l. prepreg fiber tow; m. re-feeding device; n. clamping part; o. shearing part; p. heating device; q. mandrel; r. pressure roller.

detailed description

The present invention will be described in further detail below in conjunction with the accompanying drawings.

Referring to Fig. 1, the clamping and shearing device of the present invention includes a shearing tool holder a, a connecting bolt b, a clamping guide block c, a threaded cover e, a guide rod f, a clamping head g, a guide base h, a blade i and Fasten the screw j; the direction indicated by the arrow is the movement direction of the prepreg fiber tow.

Referring to Fig. 2, a compression spring d is installed inside the clamping guide block c of the present invention.

Referring to Fig. 3, the positioning groove surface a-1 in the scheme one of the shearing tool holder of the present invention is used to position the blade i, and then the fastening screw j is matched with the threaded hole a-3 of the cutter head to install the blade i on the Shear knife holder a. The tenon table round hole a-2-1 is used to connect with the tenon-groove bar hole c-1-1 that clamps the guide block c, and combines the two parts of shearing and clamping to realize synchronous control.

Referring to Fig. 4, in the scheme 1 of clamping the guide block of the present invention, the tenon-groove bar-shaped hole c-1-1 is used to cooperate with the tenon table round hole a-2-1, and the shearing tool holder a and the clamp are connected through the connecting bolt b It is connected with the guide block c, and the horizontal height of the blade i and the clamping head g can be controlled by changing the upper and lower installation positions of the tenon table round hole a-2-1 and the tenon groove strip hole c-1-1, thereby controlling the alignment The timing of shearing and clamping the prepreg fiber tow is changed, so as to meet the requirement that the clamping force is greater than the tension at the front end of the cutting incision when the prepreg fiber tow is cut.

The threaded hole c-2 in the figure is used to connect with the linear displacement driving device, so as to control the up and down movement of the whole device with one driving action; the anti-loosening screw hole c-3 is used to install the anti-loosening screw to prevent the linear displacement driving device from being connected with the clip. The connection holding the guide block c is loose; the compression spring installation hole c-4 is used to install the compression spring d, and give the compression spring d a guiding effect.

Referring to Fig. 5 , in the scheme two of the shearing tool holder of the present invention, the tenon table bar-shaped hole a-2-2 is used to connect with the tenon-groove round hole c-1-2 of the clamping guide block c, and the shearing and clamping The two parts are combined to realize synchronous control.

Referring to Fig. 6, in the scheme two of the clamping guide block of the present invention, the mortise and groove round hole c-1-2 is used to cooperate with the tenon table strip hole a-2-2, and the shear tool holder a and the clip are connected through the connecting bolt b The holding guide block c is connected, and the horizontal height of the blade i and the clamping head g can be controlled by changing the upper and lower installation positions of the tenon table strip hole a-2-2 and the tenon groove circular hole c-1-2.

Comparing Figures 3 and 4 with Figures 5 and 6, the first connection scheme of the shearing tool holder a and the clamping guide block b is to adjust the blade i and the clamping head g by moving the installation position of the notch on the clamping guide block b Height, the fastening force of the connection is provided by the friction force between the connecting bolt b and the clamping guide block c. The second connection scheme is to adjust the height of the blade i and the clamping head g by adjusting the connection position of the notch on the shearing tool holder a. The slight deformation of the tenon and groove produced by the bolt clamps the tenon table of the shear tool holder to provide connection force. Option 1 has low structural processing requirements, but the connection reliability is low and it is easy to loosen. Scheme 2 requires high machining accuracy, but provides greater clamping force and higher reliability.

Referring to Fig. 7(a) and Fig. 7(b), the blade i of the present invention is an oblique blade, in which α is the inclination angle of the blade, and β is the angle of the blade, and the blade i is fixed on the shearing knife by fastening screw j on shelf a. The cutting edge angle β of the blade determines the sharpness of the blade, and also affects the wear resistance of the blade. When it is 10°-45°, it can ensure better sharpness and wear resistance. The inclination angle α of the cutting edge of the blade is designed to cut the prepreg fiber tow more easily.

Referring to Fig. 8, the present invention is specifically installed on the laying head. First, the prepreg fiber tow l enters the laying head k, passes through the re-feeding device m and is guided into the clamping and shearing device through the channel, and passes through the clamping part first. n, then to the cutting part o, and finally use the pressing roller r to press the prepreg fiber tow l on the mandrel q heated by the heating device p to complete the laying process.

The specific implementation steps of the present invention are described in detail below, and the laying method mainly includes the following steps:

Step 1. Install the shearing device above the shearing notch and the clamping bottom plate in the channel. During the laying process, the prepreg fiber tow passes through the channel on the clamping bottom plate, passes through the shearing notch, and enters the shearing process. Pre-impregnated fiber tow channel at the rear end of the cut;

Step 2. When the linear displacement driving device connected to the clamping and shearing device receives the clamping and shearing command, the linear displacement driving device drives the whole device to move downward, and the clamping head touches the prepreg fiber tow, and the clamping base plate Cooperate with fixing the pre-impregnated fiber tow, at this time, the tip of the shear blade begins to touch the pre-impregnated fiber tow;

Step 3. With the movement of the linear displacement drive device, the compression spring in the clamping device is compressed, and the clamping head continues to maintain contact with the prepreg fiber tow, and as the spring compression increases, the clamping force gradually increases. Big. At the same time, the blade continues to descend, and the prepreg fiber tow is cut off by using the inclined blade. At the moment when the prepreg fiber tow is cut, the clamping force must be greater than the tension of the prepreg fiber tow at the front end of the shearing incision, so as to avoid the rebound phenomenon of the prepreg fiber tow at the front end after the prepreg fiber tow is cut, and the Gripper head. The prepreg fiber tow laying device continues to move, and the prepreg fiber tow at the rear end of the shearing notch continues to be placed on the mandrel, and the prepreg fiber tow at the front end of the shearing notch stays in the entire conveying channel;

Step 4. When the prepreg fiber tow needs to be re-fed, the linear displacement driving device is retracted when the next laying is performed, and the drive device of the re-feeding device is stretched out at the same time, and the re-feeding is started, and the prepreg fiber tow passes through the shearing incision , and smoothly enter the guide channel at the rear end of the shearing cut; when the prepreg fiber tow is re-sent to the bottom of the pinch roller, the pinch roller presses down to press the pre-preg fiber tow on the mandrel, and the re-feeding device retracts at the same time , the prepreg fiber tow enters the laying state.

It can be seen from the above description that the present invention realizes the guiding, clamping and shearing of the prepreg fiber tow at the same time, and only needs a linear displacement driving device to control, which greatly simplifies the control process and realizes the prepreg fiber tow Shearing during the continuous laying process; the realization of the shearing function during the continuous laying process can greatly improve the laying efficiency of parts with holes; by adjusting the height difference between the blade and the clamping head, it can Control the time difference between the two actions of shearing and clamping, so that under the conditions of compression springs of different stiffnesses and laying speeds, the clamping force must be greater than the prepreg at the front end of the shearing incision at the moment when the prepreg fiber tow is cut. The condition of the tension force of the impregnated fiber tow; the present invention only introduces the movement of a set of clamping and shearing devices, and according to the laying heads of different quantities of prepreg fiber tows, the corresponding number of clamping and shearing devices can be installed side by side Together, each bundle of prepreg fiber tows can be controlled independently of each other without affecting each other.

The above content is a further detailed description of the present invention in conjunction with specific embodiments. It cannot be determined that the specific embodiments of the present invention are limited thereto. Within the scope of the present invention, several deduction or substitutions should be considered as belonging to the scope of protection determined by the claims of the present invention.

Claims (10)

1. A device for synchronous clamping and shearing of prepreg fiber tow in fiber laying equipment, characterized in that: it includes a guide base (h) with a channel for prepreg fiber tow, and the guide base (h) A clamping device and a shearing device are arranged side by side along the feeding direction of the prepreg fiber tow; the clamping device includes a clamping guide block (c) equipped with a compression spring (d), and the compression spring (d) The clamping head (g) used to clamp the prepreg fiber tow is connected vertically downward through the guide rod (f); the shearing device includes a shearing knife frame with a blade (i) installed at the bottom (a), the shearing tool holder (a) is fixed together with the top of the clamping guide block (c), and is connected with a linear displacement driving device capable of simultaneously controlling both of them to lift. 2. The device for synchronously clamping and shearing the prepreg fiber tow in the fiber laying equipment according to claim 1, characterized in that: the top side of the clamping guide block (c) is provided with a tenon groove, and the shearing The top side of the cutter frame (a) is provided with a tenon platform, and the clamping guide block (c) is matched with the tenon groove on the top of the shearing tool frame (a) and the tenon platform and fixed by the connecting bolt (b). 3. The device for synchronously clamping and shearing the prepreg fiber tow in the fiber laying equipment according to claim 2, characterized in that: a tenon is vertically provided on the groove wall of the tenon groove of the clamping guide block (c) Groove strip hole (c-1-1), the tenon platform of the shear tool holder (a) is aligned with the tenon and groove strip hole (c-1-1), and there are multiple tenon platform round holes (a-2- 1), the connecting bolt (b) passes through the tenon groove strip hole (c-1-1) and the tenon table round hole (a-2-1) to clamp the guide block (c) and the shearing knife holder (a ) to fix. 4. The device for synchronously clamping and shearing the prepreg fiber tow in the fiber laying equipment according to claim 2, characterized in that: the tenon platform of the shear knife holder (a) is vertically provided with a tenon platform strip Hole (a-2-2), the groove wall of the tenon groove for clamping the guide block (c) is aligned with the tenon table bar hole (a-2-2), and there are multiple tenon groove round holes (c-1- 2), the connecting bolt (b) passes through the round hole of the tongue and groove (c-1-2) and the strip-shaped hole of the tenon table (a-2-2) to clamp the guide block (c) and the shearing knife holder (a ) to fix. 5. The device for synchronously clamping and shearing the prepreg fiber tow in the fiber laying equipment according to claim 2, characterized in that: the top of the clamping guide block (c) is provided with a linear displacement drive The threaded hole (c-2) of the device and the top of the clamping guide block (c) are installed with anti-loosening screws for preventing the linear displacement drive device from loosening. 6. The device for synchronously clamping and shearing the prepreg fiber tow in the fiber laying equipment according to claim 5, characterized in that: the linear displacement driving device is selected from a cylinder, a linear motor or a linear electromagnetic driving device. 7. The device for synchronously clamping and shearing the prepreg fiber tow in the fiber laying equipment according to claim 1, characterized in that: the bottom end of the shearing knife holder (a) is provided with a blade for placing ( The positioning groove surface (a-1) of i) is provided with a cutter head threaded hole (a-3) for fixing the blade (i) on the positioning groove surface (a-1). 8. The device for synchronously clamping and shearing the prepreg fiber tow in the fiber laying equipment according to claim 1 or 7, characterized in that: the blade (i) is an oblique blade with an inclination angle of 20°～60°, the cutting edge angle is 10°～45°. 9. The device for synchronous clamping and shearing of prepreg fiber tow in the fiber laying equipment according to claim 1, characterized in that: the tail end of the guide rod (f) is provided with a boss, and the boss surface and the compression spring ( d) Cooperate, the end of the clamping guide block (c) is installed with a threaded cover (e) capable of clamping the boss at the end of the guide rod (f), and the neck of the guide rod (f) passes through the threaded cover (e) to connect Gripper head (g). 10. The device for synchronously clamping and shearing the prepreg fiber tow in the fiber laying equipment according to claim 1, characterized in that: the surfaces of the clamping head (g) and the guide base (h) are both Made of PTFE material.