CN105127517A - Built-in cutting mechanism and a built-in cutting process - Google Patents

Abstract

The invention discloses an embedded cutting mechanism, comprising: a drive motor; the eccentric shaft device comprises a power shaft and an eccentric device fixed at one end of the power shaft, the power shaft is connected with the driving motor through a set of transmission device, the eccentric device is provided with an eccentric shaft, a distance is reserved between the axis of the eccentric shaft and the axis of the power shaft, and the distance is equivalent to the thickness of a workpiece processed by the built-in cutting mechanism so as to ensure that the workpiece is cut off; the cutting device comprises a knife rest and an inner blade cutter arranged on the knife rest, the knife rest is connected with the eccentric shaft through a bearing, and the inner blade cutter is sleeved outside the workpiece. The internal cutting mechanism provided by the invention has the advantages of high processing efficiency and small occupied space, and can meet the production requirements of intensification and miniaturization. The invention also discloses an embedded cutting process.

Description

Built-in cutting mechanism and a built-in cutting process

technical field

The invention relates to a mechanical processing device, in particular to a built-in cutting mechanism and a built-in cutting process.

Background technique

In the general processing of tubular workpieces, in order to meet the needs of the workpiece design, in addition to the bending process steps such as bending the shape of the specific parts of the workpiece, it also includes the cutting step according to the length of the workpiece design. The above-mentioned cutting step can be combined with the pipe bending step to be carried out continuously, and the cutting step can also be performed after the workpiece is bent.

There are generally two ways to cut off the tubular workpiece at present; one is to use a saw blade to cut off, and the other is to use a rotary knife as shown in Figure 1 to cut off. Among them, the method of directly using saw blades to cut is relatively primitive, and a large amount of heat and debris will be generated during the cutting process, and the processing accuracy is low, which is not conducive to processing more precise product parts. As shown in FIG. 1 , the rotary knife is mainly composed of three claws 22 mounted on the rotary seat and an outer cutting knife 221 mounted on the claws 22 . During processing, the claw 22 first drives the outer blade cutter 221 to clamp the pipe fitting, and then the rotating seat drives the cutter claw 22 and the outer blade cutter 221 to rotate, thereby cutting off the key. The rotary knife cutting method has high processing precision and does not generate debris and heat, and is more and more widely used in processing machine tools.

But, also there is following deficiency in the mode that existing rotary knife cuts off:

(1) The processing efficiency is low, and one rotary knife can process one pipe fitting at a time;

(2), take up a lot of space, because at least three claws must be installed on the swivel seat, the volume is thus relatively large.

Based on the above shortcomings, the existing rotary knife cutting method cannot meet the production requirements of intensification and miniaturization.

Contents of the invention

It is an object of the present invention to provide a built-in cut-off mechanism. Another object of the present invention is to provide an inline cutting process.

According to one aspect of the present invention, a built-in cutting mechanism is provided, comprising:

motor;

The eccentric shaft device includes a power shaft and an eccentric device fixed at one end of the power shaft. The power shaft and the drive motor are connected through a set of transmission devices. The eccentric device has an eccentric shaft, and the center of the eccentric shaft and the shaft of the power shaft There is a distance between the centers, which is equivalent to the thickness of the workpiece processed by the built-in cutting mechanism to ensure that the workpiece can be cut off;

The cutting device includes a knife holder and an inner cutting knife installed on the knife holder. The knife holder is connected with the eccentric shaft through a bearing, and the inner cutting knife is sleeved on the outside of the workpiece.

The transmission device is a belt, chain or gear.

With the built-in cutting mechanism of the above technical solution, when the drive motor drives the power shaft to rotate through the transmission device, the eccentric device fixed at one end of the power shaft rotates with the power shaft, the eccentric shaft makes a circular motion around the center of the power shaft, and the tool holder follows the eccentric The shaft makes a circular motion, so the inner blade cutter sleeved on the outside of the workpiece makes a circular motion along the outer wall of the workpiece, so as to groove or cut off the outer wall of the workpiece.

In some embodiments, the eccentric shaft device includes a first connecting shaft and a second connecting shaft, the first connecting shaft is fixedly connected to the power shaft, the eccentric shaft is arranged on the second connecting shaft, and the first connecting shaft and the second connecting shaft pass through The inclined device is connected. Thus, the distance between the axis center of the eccentric shaft and the axis center of the power shaft can be adjusted by adjusting the relative position between the first connecting shaft and the second connecting shaft, thereby adjusting the shearing force of the inner blade cutter.

In some embodiments, the slope device includes a slanted hole or a chute intersecting the axis center of the power shaft provided on one of the first connecting shaft and the second connecting shaft, and a chute provided on the first connecting shaft and the second connecting shaft. A slide block or a slide bar on the other of the shafts, the slide block or slide bar matches the inclined hole or the inclined slot and moves in the inclined hole or the inclined slot. Therefore, the relative position between the first connecting shaft and the second connecting shaft is more convenient to adjust.

In some embodiments, the sliding block and the inclined hole or the inclined groove have the same inclination angle. This can ensure that the eccentric shaft always maintains the original angle during the adjustment process, so that the transmission between the eccentric shaft and the tool holder is smoother.

In some embodiments, it also includes a connecting piece, the connecting piece is connected with the second connecting shaft through a bearing, the connecting piece is also provided with a translation guide rail and a forward and backward drive device, and the forward and backward drive device drives the connecting piece to move along the translation guide rail, so that the second The connecting shaft moves along the ramp device. Thus, the inner cutter can cut the workpiece periodically, thereby reducing the friction between the workpiece and the inner cutter, improving the cutting efficiency, protecting the inner cutter and prolonging its service life.

In some embodiments, the translation guide rail includes a slider and a slide rail, and the forward and backward driving device includes a forward and backward motor and a feed rack, and the motor shaft of the advance and retreat motor is provided with a feed gear corresponding to the feed rack, and the connecting piece is connected with the feed rack. The slide block is fixedly connected, and the feed rack is fixedly connected with the connecting piece. The advance and retreat driving device can also be an air cylinder, an oil cylinder or an electric push rod. The translation guide rail can also be a casing structure or a structure in which a slide groove and a sliding block cooperate.

In some embodiments, it also includes a fixed knife rest, the fixed knife rest is close to the cutting device and arranged parallel to it, the fixed knife rest is provided with a through hole corresponding to the position of the inner blade cutter, the shape of the through hole is consistent with the shape of the workpiece Corresponding. The through hole can better fix the workpiece and increase the shear force of the inner blade cutter, so that the efficiency of the inner blade cutter is higher.

The built-in cutting mechanism provided by the present invention has the following beneficial effects:

(1) The processing efficiency is high, and multiple inner blade cutters can be installed on one tool holder at the same time, so that multiple pipe fittings can be processed at the same time;

(2) Small space occupation, since the inner blade cutter is installed inside the knife holder, no extra space is needed, so the volume is small.

The built-in cutting mechanism can meet the production requirements of intensification and miniaturization.

According to another aspect of the present invention, a built-in cutting process is provided. An eccentric shaft device is used to drive the inner cutting knife to make a circular motion along the outer wall of the workpiece, so as to groove or cut off the outer wall of the workpiece.

In some embodiments, the eccentric shaft device is any one of the above-mentioned eccentric shaft devices.

Description of drawings

Fig. 1 is a structural schematic diagram of a rotary knife in an existing cutting mechanism.

Fig. 2 is a schematic structural view of a built-in cutting mechanism according to an embodiment of the present invention.

Fig. 3 is an assembly diagram of the built-in cutting mechanism shown in Fig. 2 .

Fig. 4 is an assembly diagram of the cutting device shown in Fig. 3 .

Fig. 5 is a cross-sectional view of the eccentric shaft device shown in Fig. 3 .

FIG. 6 is an assembly view of the first connecting shaft and the second connecting shaft shown in FIG. 5 .

Fig. 7 is an assembly diagram of the forward and backward driving device shown in Fig. 3 .

Fig. 8 is a schematic structural view of another embodiment of the built-in cutting mechanism of the present invention.

Detailed ways

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

Example 1

Figures 2 to 7 schematically show a built-in cutting mechanism according to an embodiment of the present invention. As shown in the figure, the device is installed on a frame 5 and includes a drive motor 1 , an eccentric shaft device 3 and a cutting device 4 .

The eccentric shaft device 3 includes a power shaft 31 , a first connecting shaft 32 and a second connecting shaft 33 .

The power shaft 31 is connected with the driving motor 1 through a transmission device 2 .

The first connecting shaft 32 is fixedly connected to the power shaft 31 . An eccentric shaft 34 is disposed on the second connecting shaft 33 .

There is a distance between the axis of the eccentric shaft 34 and the axis of the power shaft 31, which is equivalent to the thickness of the workpiece processed by the built-in cutting mechanism to ensure that the workpiece can be cut off;

The cutting device 4 includes a knife rest 41 and six inner cutting knives 42 mounted on the knife rest 41 . Both ends of the knife rest 41 are connected with the two eccentric shafts 34 through bearings. The inner cutting knife 42 is sleeved on the outside of the workpiece.

In this embodiment, the transmission device 2 is a belt. In another embodiment, the transmission device 2 can also be a chain or a gear.

The first connecting shaft 32 and the second connecting shaft 33 are connected through a ramp device. The distance between the axis center of the eccentric shaft and the axis center of the power shaft can be adjusted by adjusting the relative position between the first connecting shaft and the second connecting shaft, so as to adjust the shearing force of the inner blade cutter.

The ramp device includes a chute 321 disposed on the first connecting shaft 32 intersecting with the axis of the power shaft 31 , and a sliding block 331 disposed on the second connecting shaft 33 . The slider 331 matches with the chute 321 and moves in the chute 321 .

The sliding block 331 has the same inclination angle as the chute 321 . Therefore, it can be ensured that the eccentric shaft 34 always maintains the original angle during the adjustment process, so that the transmission between the eccentric shaft 34 and the tool holder 41 is smoother.

In some other embodiments, the slider can also be arranged on the first connecting shaft, and the corresponding chute can be arranged on the second connecting shaft. The inclined device may also include an inclined hole and a sliding rod, and the inclined hole and the sliding rod may be respectively arranged on the first connecting shaft and the second connecting shaft.

The device also includes a connection piece 6 . The connecting piece 6 is connected with the second connecting shaft 33 through a bearing.

The connecting piece 6 is also provided with a translation guide rail 7 and a forward and backward driving device. The forward and backward driving device drives the connecting member 6 to move along the translation guide rail 7 , and then the second connecting shaft 33 moves along the chute 321 .

The translation guide rail 7 includes a slider 71 and a slide rail 72 . The connecting piece 6 is fixedly connected with the slider 71 . Slide rail 72 is fixed with frame 5.

The advancing and retreating driving device comprises an advancing and retreating motor 91 and a knife rack 8 . The feed rack 8 is fixedly connected with the connector 6 .

A feed gear 92 corresponding to the feed rack 8 is provided on the motor shaft of the advancing and retreating motor 91 .

In other embodiments, the forward and backward driving device can also be an air cylinder, an oil cylinder or an electric push rod. The translation guide rail can also be a casing structure or a structure in which a slide groove and a sliding block cooperate.

Using the built-in cutting mechanism of the above technical solution, when the drive motor 1 drives the power shaft 31 to rotate through the transmission device 2, the eccentric device 34 fixed on one end of the power shaft 31 follows the rotation of the power shaft 31, and the eccentric shaft 34 revolves around the axis of the power shaft 31 Performing a circular motion, the tool holder 4 follows the eccentric shaft 34 to perform a circular motion, so that the inner cutting knife 42 sleeved outside the workpiece makes a circular motion along the outer wall of the workpiece, thereby slotting or cutting the workpiece on the outer wall.

The advance and retreat motor 91 can drive the connecting member 6 to move parallelly along the slide rail 72 through the feed gear 92 and the feed rack 8 , and then the second connecting shaft 33 moves along the chute 321 . When the forward and backward motor 91 drives the connecting piece 6 to force the second connecting shaft 33 to move outwards along the chute 321, the distance between the axis of the eccentric shaft 34 and the axis of the power shaft 31 increases, so that the knife rest 41 is formed into a circle. The diameter of the movement increases, and the inner edge cutter 42 moves away from the workpiece. Conversely, when the forward and backward motor 91 drives the connecting member 6 to force the second connecting shaft 33 to move inward along the chute 321 , the inner cutting knife 42 cuts the workpiece. Thus, the inner edge cutter 42 can be periodically cut the workpiece, thereby reducing the friction between the workpiece and the inner edge cutter 42, improving the cutting efficiency, and protecting the inner edge cutter 42 to prolong its use. life.

The built-in cutting mechanism provided by the invention has high processing efficiency and can process six pipe fittings at the same time; it also occupies a small space and can meet the requirements of intensive and miniaturized production.

Example 2

Fig. 8 schematically shows a built-in cutting mechanism according to another embodiment of the present invention. As shown in the figure, the difference from Embodiment 1 is that a fixed knife holder 10 is also included. The fixed knife rest 10 is arranged close to the cutting device 4 and parallel thereto. The fixed knife holder 10 is provided with a through hole 101 corresponding to the position of the inner cutting knife. The shape of the through hole 101 corresponds to the shape of the workpiece. The through hole 101 can better fix the workpiece. During processing, the fixed knife holder 10 is fixed, and the inner blade cutter performs circular motion, so that a dislocation is formed between the inner blade cutter and the through hole 101, so that not only the cutting force of the inner blade cutter can be utilized, but also the inner blade cutter can be used The shear force between the blade cutter and the fixed knife holder 10 makes the processing efficiency of the inner blade cutter higher and the service life longer.

What have been described above are only some embodiments of the present invention. For those skilled in the art, without departing from the inventive concept of the present invention, several modifications and improvements can be made, and these all belong to the protection scope of the present invention.

Claims (9)

1. The built-in cutting mechanism is characterized in that it includes: motor; The eccentric shaft device includes a power shaft and an eccentric device fixed at one end of the power shaft, the power shaft is connected with the driving motor through a transmission device, the eccentric device has an eccentric shaft, and the There is a distance between the axis center of the eccentric shaft and the axis center of the power shaft, and the distance can ensure that the workpiece is cut off; The cutting device includes a knife holder and an inner cutting knife installed on the knife holder, the knife holder is connected with the eccentric shaft through a bearing, and the inner cutting knife is sleeved outside the workpiece. 2. The built-in cutting mechanism according to claim 1, wherein the eccentric shaft device comprises a first connecting shaft and a second connecting shaft, the first connecting shaft is fixedly connected to the power shaft, and the The eccentric shaft is arranged on the second connecting shaft, and the first connecting shaft and the second connecting shaft are connected through a ramp device. 3. The built-in cutting mechanism according to claim 2, characterized in that, the slope device comprises a connection between the power shaft and the power shaft, which is arranged on one of the first connecting shaft and the second connecting shaft. A slanted hole or a chute where the shaft centers intersect, and a slider or a slider arranged on the other of the first connecting shaft and the second connecting shaft, the slider or the sliding bar is connected to the slanted hole Or the chute matches and moves within the slant hole or the chute. 4. The built-in cutting mechanism according to claim 3, characterized in that, the inclination angle of the sliding block and the inclined hole or the inclined groove is the same. 5. The built-in cutting mechanism according to any one of claims 2 to 4, further comprising a connecting piece, the connecting piece is connected to the second connecting shaft through a bearing, and the connecting piece also A translation guide rail and an advance and retreat drive device are provided, and the advance and retreat drive device drives the connecting piece to move along the translation guide rail, thereby making the second connection shaft move along the slope device. 6. The built-in cutting mechanism according to claim 5, wherein the translation guide rail comprises a slider and a slide rail, the forward and backward driving device comprises a forward and backward motor and a feed rack, and the motor of the forward and backward motor A feeding gear corresponding to the feeding rack is provided on the shaft, the connecting piece is fixedly connected with the slider, and the feeding rack is fixedly connected with the connecting piece. 7. The built-in cutting mechanism according to claim 1, characterized in that, it also includes a fixed knife rest, which is arranged close to the cutting device and parallel to it, and the fixed knife rest is provided with the internal The position of the edge cutter corresponds to the through hole, and the shape of the through hole corresponds to the shape of the workpiece. 8. A built-in cutting process, characterized in that the eccentric shaft device is used to drive the inner blade cutter to make a circular motion along the outer wall of the workpiece, so as to groove or cut the workpiece on the outer wall of the workpiece. 9 . The internal cutting process according to claim 8 , wherein the eccentric shaft device is the eccentric shaft device according to any one of claims 1 to 4 .