CN102284654B - Multi-shaft forming mechanism for numerical control spring coiling machine - Google Patents

Abstract

The invention mainly discloses a multi-axis forming mechanism of a numerically controlled spring coiling machine, which includes at least one variable diameter unit, the variable diameter unit includes a split slider device connected to a universal tool holder, and a vertical drive device for driving the split slider device. The present invention can adopt different methods to realize the drive of one axis, two axes, three axes, four axes or even more axes, realize the flexible and adjustable coil diameter, control the spring forming from different angles, and meet the needs of various springs on the market.

Description

Multi-axis forming mechanism of CNC coiling machine

technical field

The invention relates to the technical field of numerically controlled spring coiling machines, in particular to the multi-axis forming structure of numerically controlled spring coiling machines.

Background technique

The spring coiling machine is a mechanical device for producing springs. The steel wire is fed from the wire frame, firstly straightened, then the steel wire is coiled to reduce the diameter of the spring, and finally cut by a cutter to complete the production of a spring.

At present, the types of springs are not limited to the original single spiral structure, and various shapes have appeared, such as pagoda-shaped, drum-shaped, concave-shaped, convex-shaped extension springs, torsion springs, special-shaped, etc., the spring types are rich The improvement of performance and precision puts forward more requirements for spring coiling machines, and the key lies in the coiling diameter tooling process. The difference between imported equipment and domestic equipment lies in process design, raw material heat treatment processing and installation accuracy, personnel quality and details. Therefore, the inventor has made a major breakthrough in the design and invention of the multi-axis forming mechanism of the CNC coiling machine, and it is important to obtain domestic equipment to replace imported equipment.

The coiling diameter of the spring is realized through the work of the diameter reducing mechanism. The steel wire is sent to the coiling diameter position, and the top spring pin of the diameter reducing mechanism supports the guide, so that the steel wire bends. The bending shape depends on the running track of the diameter reducing mechanism, so the current The improvement of the diameter mechanism has become a key technical issue in the spring coiling machine.

In Chinese patent ZL200910101167.6, a variable diameter mechanism for CNC compression spring machine is proposed, including servo motor, ball screw, variable diameter base, screw nut slider, fixed support, variable diameter base, variable diameter base pressure plate, knife Frame, top spring pin seat, top spring pin, front wall panel, front wall panel arc groove. The servo motor is fixedly installed on the fixed support, and its rotating shaft is connected with the ball screw, and the ball screw and the nut slider are clearance-fitted to realize the linear motion of the nut slider. At the same time, the nut slide block is matched with the variable diameter base, the variable diameter base plate is fixed on the variable diameter base, the thread nut slide block slides in the stroke groove formed by the variable diameter base and the variable diameter base plate, and the top spring pin is fixed by the knife holder On the top spring pin seat, the top spring pin seat is fixed on the nut slide block and slides with it, finally making the top spring pin resist the spring variable diameter and applying force. The design of the arc groove on the front plate can only adjust the angle of the top spring pin, and the arc can be moved manually.

In this patented technical solution, the adjustment of the variable diameter trajectory is mainly through the stroke change in one direction, and the stroke displacement of the nut slider in the other. The shape of the arc groove of the front wall plate is fixed, so the running track of the variable-diameter base cannot be changed. The wire top spring pin is assembled on the nut slider and can only move in a straight line, and cannot be adjusted longitudinally at all. However, in the case of endless new types of springs, only relying on the operation in this direction is far from meeting the needs of existing spring types. Therefore, the inventor has designed a multi-axis forming mechanism, which makes the adjustment of the spring diameter change various , the case arises from this.

Contents of the invention

The purpose of the present invention is to provide a multi-axis diameter-reducing mechanism of a numerically controlled spring coiling machine, which can realize flexible and adjustable coil diameter, control spring forming from different angles, and bend coiling to meet the requirements of various springs currently on the market.

In order to achieve the above object, the present invention is achieved through the following technical solutions:

The multi-axis forming mechanism of the numerically controlled spring coiling machine includes at least one variable-diameter unit, the variable-diameter unit includes a split-type slider device connected to a universal tool holder, and a vertical drive device for driving the split-type slider device.

The vertical power device includes a vertical servo motor, a vertical motor fixing seat, a vertical ball screw, and a vertical screw nut seat; the vertical servo motor fixedly supported on the vertical motor fixing seat, its output shaft is connected to the vertical ball screw, vertical The screw nut seat is sheathed on the vertical ball screw, and the split slider seat fixed on the slide plate is fixed to the vertical screw nut seat, and moves linearly along the ball screw along with the vertical screw nut seat.

The split slider device includes an upper slider, an adjustment plug iron, a lower slider base, and a plug iron guide seat; the upper slider is a cover structure, the upper surface is connected with a universal tool holder, and the bottom surface is concave to form an assembly adjustment plug The cavity of the iron; the adjustment plug iron has two pieces, which are respectively pasted on the left and right side walls of the cavity of the upper slider, and a sliding groove is formed between them; the plug iron guide seat is located between the two adjustment plug irons, and the shape of the sliding groove It matches and is fixedly connected to the base of the lower slider; a tension spring for eliminating the gap between the vertical ball screw and the vertical screw nut seat is connected between the upper slider and the lower slider base.

The left and right sides of the upper slider are respectively provided with screw holes for installing adjustment screws, and the adjustment screws are tightly pressed against the adjustment plug iron; the base of the lower slider is connected with the plug iron guide seat by bolts, and is pinned and positioned by pins at the same time.

The sliding grooves formed between the two adjusting plug irons are dovetail grooves, V-shaped grooves, rectangular grooves, and diamond-shaped grooves.

The universal knife rest includes a knife holder, a top spring pin knife holder, and a top spring pin; the top spring pin knife holder locked and connected with the top spring pin is embedded in the knife holder, and the two wings of the knife holder are respectively provided with arcs. The center is located in the arc-shaped groove inside the tool holder seat, and the fixing screw of the tool holder seat is located in the arc-shaped groove to connect with the split slider seat.

The knife holder seat and the top spring pin knife holder are vertically connected by height adjusting screws, and horizontally positioned by pin bolts.

The variable diameter unit is located on the slide plate laterally driven by the horizontal power device, and the slide plate slides on the linear track.

The horizontal power device includes a horizontal servo motor, a horizontal ball screw, and a horizontal screw nut seat; the horizontal servo motor is fixedly supported on the horizontal motor fixing seat, and its output shaft is connected to the horizontal ball screw and connected to the slide plate or the connecting plate The horizontal screw nut seat is put on the horizontal ball screw for linear motion.

There are two variable diameter units, and the sliding plates of the two variable diameter units are integrated or fixedly connected to one body, and are driven to slide left and right by the same horizontal driving device.

The horizontal driving device includes a connecting rod, an eccentric wheel, and a horizontal servo motor; one end of the connecting rod is connected to drive the slide plate, and the other end is connected to the eccentric wheel driven by the horizontal servo motor.

The vertical servo motor and the horizontal servo motor are connected with the vertical ball screw and the horizontal ball screw by soft connection; the soft connection structure includes a coupling head and a joint, and the coupling head is a connecting pipe body with different apertures at both ends, supported by bearings On the motor fixing seat, one end of the servo motor output shaft is sleeved, and the other end is sleeved with a joint; the outer end of the joint is sleeved with a ball screw, and the inner end is pinned to the coupling head through the first pin, and the joint and the ball screw pass through The second pin is pinned, and the first pin is perpendicular to the second pin.

After adopting the above scheme, the present invention has many beneficial effects:

In the present invention, multi-axis drive is adopted, relying on the independent operation of the vertical servo motor and the horizontal servo motor, and adjusting the speed of the two servo motors, the formation of different spring diameters can be realized. Compared with the limitation of manual adjustment angle in the traditional spring coiling machine, In the present invention, flexible adjustment is realized, and the forming of the control spring is more flexible.

At the same time, the present invention can adopt the universal knife holder to realize the radial rotation and up, down, longitudinal, left and right movement of the top spring pin, and can control the coil spring from various angles. In addition, the split slider device is finely ground by split and block, and then combined into an overall structure. The gap between the upper slider and the upper slider guide seat can be adjusted longitudinally, so that the assembly accuracy and assembly clearance can be adjusted to the highest precision level. It is in the best state and solves the problem of longitudinal position deviation on the traditional tool holder. Using the extension spring at the same time can eliminate the gap between the vertical ball screw and the vertical screw nut seat.

In addition, the servo motor in the present invention adopts a soft connection method, which improves the concentricity of the connection between the servo motor and the ball screw, avoids the non-parallelism between the output shaft and the ball screw, and makes the ball screw run smoothly, reducing wear and tear. Noise, improve the life of the workpiece.

Description of drawings

Fig. 1 is the structural representation of preferred embodiment 1 of the present invention;

Fig. 2 is the structural representation of preferred embodiment 2 of the present invention;

Fig. 3 is a schematic structural view of a third preferred embodiment of the present invention;

Fig. 4 is a schematic structural diagram of a fourth preferred embodiment of the present invention;

Fig. 5 is a schematic structural diagram of a split slider seat in a preferred embodiment of the present invention;

Fig. 6 is a schematic diagram of a soft connection structure in a preferred embodiment of the present invention;

Fig. 7 is a schematic diagram of the structure of the universal tool holder according to the preferred embodiment of the present invention.

Detailed ways

In conjunction with accompanying drawings 1 to 7, the preferred embodiments of the present invention will be further described in detail.

Referring to Fig. 1, it is a schematic diagram of the implementation structure of two shafts in the present invention, including two upper and lower relative variable diameter units 40, and each variable diameter unit 40 includes a vertical servo motor 2, a vertical motor fixing seat 3, a vertical ball screw 4, Vertical screw nut seat 5, split slide block seat 6, universal knife rest 7. Wherein the vertical servo motor 2, the vertical ball screw 4, and the vertical screw nut seat 5 form a set of vertical power devices for driving the trajectory of the vertical stroke.

A vertical servo motor 2 is fixedly supported on the vertical motor holder. The output shaft of the vertical servo motor 2 is connected to the vertical ball screw 4 through a soft connection, and the vertical screw nut seat 5 is threaded on the vertical ball screw 4 to form a screw pair, which converts the rotation motion of the vertical ball screw 4 move in a straight line. The vertical screw nut seat 5 is connected with the split slider device 6, which drives the split slider device 6 to make a linear motion together, and the split slider device 6 is connected to the universal knife rest 7, and finally drives the universal knife rest 7 to move linearly .

The soft connection mentioned therein, see FIG. 6 , its structure mainly includes a coupling head 12 and a joint 13 . The coupling head 12 is a communicating pipe body with two ends having different apertures. One end is directly socketed with the output shaft of the vertical servo motor 2 , and the other end is socketed with a joint 13 . The entire joint 13 is contained in the coupling head 12 . The joint 13 is a pipe with a hole at one end. The outer end of the hole is sleeved with the vertical ball screw 4, and the inner end is pinned with the coupling head 12 through the first pin 14. At the same time, the outer end of the joint 13 is connected with the vertical ball screw. 4 is pinned through the second pin 15, and the first pin 14 is perpendicular to the second pin 15 at 90°. The outside of the coupling head 12 is supported on the vertical motor fixing seat 3 through the bearing 16, and the vertical screw nut seat 5 is sleeved on the vertical ball screw 4, and a parallel cap 17 is sandwiched between the bearing 16 and the vertical screw nut seat 5 spacer to eliminate chafing damage.

The sliding structure adopted in the present invention adopts the split slider device 6, the traditional slider can only be limited to travel in the stroke groove, and cannot be adjusted when worn, the split structure in the present invention can solve this problem .

As shown in FIG. 5 , the split slider seat 6 mainly includes an upper slider 18 , an adjustment plug iron 19 , a plug iron guide seat 20 , and a lower slider base 21 . Wherein the upper surface of the upper slider 18 is provided with a fixed groove body 33 for embedding the vertical screw nut seat 5, and the two are connected into one body through fasteners.

The upper slider 18 is a cover structure with a concave bottom surface, forming a cavity with an opening facing downward. Regulating stopper iron 19 is altogether two, is distributed in the left and right sides of the cavity that upper slider 18 forms. The adjustment plug iron 19 is fixedly connected with the upper slider 18 longitudinally, and holes 22 are respectively opened on the left and right sides of the upper slider 18 for assembling the adjustment screw. The location of Serbia 19. The relative faces of two pieces of left and right adjustment plug irons 19 are inclined planes, thus the sliding groove formed between the two is a dovetail groove with a small bottom and a big top. The plug iron guide 20 is a dovetail slide rail matched with the dovetail groove, and the plug iron 19 is adjusted so that the plug iron guide 20 is placed in the dovetail groove and relatively slides. When the adjusting screw adjusts and adjusts the position of the plug iron 19, the height position of the upper slider 18 relative to the lower slider base 21 is adjusted through the cooperation of the dovetail groove and the inclined plane of the dovetail slide rail, so as to realize the precise adjustment of the gap of the universal knife rest 7.

The lower block base 21 is located below the plug iron guide seat 20, and bolt holes 23 are provided in the longitudinal direction. positioning between the two. In addition, a tension spring groove 34 is provided between the upper slider 18 and the lower slider base 21 , one end of the tension spring is connected to the upper slider 18 , and the other end is connected to the lower slider base 21 . When the upper slider 18 and the lower slider base 21 slide relatively, the tension of the extension spring can eliminate the working gap between the vertical ball screw 4 and the vertical screw nut seat 5, so that the precision is higher.

Wherein the sliding groove mentioned above can also be a V-shaped groove, a rectangular groove or a rhombus groove etc. except the shape of the dovetail groove of the above-mentioned structure, which mainly changes and adjusts the shape of the plug iron 19.

Referring to FIG. 7 , the universal knife rest 7 in this embodiment includes a knife holder seat 25 , a top spring pin knife holder 26 , and a top spring pin 27 . A groove is formed on the upper surface of the knife holder seat 25, and the top spring pin knife holder 26 is embedded in the groove. The screw 28 is tightened to adjust the position height of the top spring pin knife holder 26 relative to the knife holder seat 25 . In addition, a pin bolt 29 is used for positioning connection in the knife holder seat 25 and the top spring pin knife holder 26. Top spring pin 27 is fixed on the head of top spring pin knife clip 26 by locking screw 32 .

On the two wings of the knife holder seat 25, an arc groove 30 is respectively provided. The center of circle of the arc groove 30 is located inside the knife holder seat 25, and the knife holder seat fixing screw 31 fixed with the upper reducing slider 18 is located in the arc groove 30. , the entire knife holder seat 25 realizes the rotation of various angles by means of the cooperation of the arc groove 30 and the knife holder seat fixing screw 31 .

In conjunction with Fig. 1, when the present embodiment one is working, two variable diameter units 40 can be directly fixed on the front wallboard of the coil spring complete machine (this method can also be adopted when there is only one variable diameter unit 40). The upper and lower two variable diameter units 40 work independently. When the vertical servo motor 2 drives the vertical ball screw 4 to rotate, the vertical screw nut seat 5 is forced to drive the upper slider 18 to perform linear motion. The universal tool rest fixed on the upper slider 18 7 also realizes linear motion.

Referring to Fig. 2 again, in the second embodiment, the reducing unit 40 is no longer simply fixed on the front wall, but a horizontal power device, a slide plate 1 and a linear track 35 are added.

Skateboard 1 is a base for horizontal movement. In the second embodiment, the upper and lower two variable-diameter units 40 are fixed on the same slideboard 1. A linear track 35 is provided under the slideboard 1. The slideboard 1 is driven by a horizontal power device to realize Sliding on the linear track 35.

The horizontal power unit includes a horizontal servo motor 8, a horizontal ball screw 9, a horizontal screw nut seat 10, and a horizontal motor fixing seat 11. Its installation structure and principle are the same as those of the vertical power unit. The vertical ball screw 4 and the horizontal ball screw 9 90° vertical.

In the second embodiment, in addition to the vertical drive realized in the first embodiment, there is also a horizontal drive. When two directions and three axes act at the same time, the horizontal screw nut seat 10 is driven by the horizontal servo motor 8 in the horizontal direction. Move laterally with the skateboard 1. Simultaneously, vertically, the horizontal screw nut seat 5 is driven by the vertical servo motor 2 to move vertically, which drives the upper reducing slide block 18 to move vertically together with the universal knife rest 7 . When the two directions of motion are superimposed, a displacement motion trajectory is formed, which realizes various adjustments of the spring coil diameter and radian, avoids the problems limited by traditional spring coil machines, and meets the coil diameter requirements of various springs on the market. more expanded.

Fig. 3 is another structure of the three-axis drive in the present invention, which is different from the second embodiment in that the form of the horizontal power device is different. In the third embodiment, the horizontal power device includes a connecting rod 36 , an eccentric wheel 37 , and a horizontal servo motor 38 . One end of the connecting rod 36 is hinged to the slide plate 1, and the other end is hinged to the eccentric wheel 37. The rotation of the eccentric wheel 37 drives the connecting rod 36 to reciprocate horizontally, thereby realizing the horizontal sliding of the slide plate 1. The eccentric wheel 37 is driven by a horizontal servo motor 38 . In the third implementation, due to the setting of the eccentric wheel 37, the horizontal servo motor 38 can be arranged on one side, which can just be embedded inside the wallboard of the equipment, so as to realize the compactness and aesthetics of the equipment assembly.

In addition, it can be seen from Fig. 2 and Fig. 3 that the sliding plate 1 of the upper and lower diameter reducing unit 40 can be an integral structure or a split structure, and the upper and lower parts are fixedly connected by the connecting plate 39, and then driven by a horizontal power device.

Referring to Fig. 4, it is the fourth preferred embodiment in the present invention, the difference from the second embodiment and the third embodiment is that the upper and lower diameter reducing units 40 are independently installed on a slide plate 1, and each slide plate 1 is equipped with a second embodiment In the horizontal power device, the upper and lower diameter-reducing units 40 are respectively driven by two shafts in the vertical and horizontal directions, and there are four axes in total, so that the movement trajectories of the upper and lower two diameter-reducing units 40 can be adjusted respectively. When the operating speed in a single direction When the change is made, the two-way displacement track can be used, thereby changing the coil diameter of the spring, and the adjustment accuracy is higher.

The above-mentioned embodiments are only used to explain the inventive concept of the present invention, rather than to limit the protection of the rights of the present invention. Any non-substantial changes are made to the present invention by using this concept (such as replacing vertical ball wires with swing rods, racks and pinions, etc.) Rod or horizontal ball screw to promote the top spring pin) should fall into the protection scope of the present invention.

Claims (11)

1. The multi-axis forming mechanism of the numerical control spring coiling machine is characterized in that: it includes at least one variable diameter unit, the variable diameter unit includes a split slider device connected to the universal tool holder, and a vertical drive device for driving the split slider device; The universal tool holder described above includes a knife holder, a top spring pin knife holder, and a top spring pin; An arc-shaped groove is located inside the tool holder seat, and the fixing screw of the tool holder seat is located in the arc-shaped groove and connected with the split slider seat. 2. The multi-axis forming mechanism of numerically controlled spring coiling machine according to claim 1, characterized in that: the vertical driving device comprises a vertical servo motor, a vertical motor fixing seat, a vertical ball screw, a vertical screw nut seat; The vertical servo motor supported on the vertical motor fixing seat, its output shaft is connected to the vertical ball screw, the vertical screw nut seat is sleeved on the vertical ball screw, and the split slider seat fixed on the skateboard is fixed to the vertical screw nut The seat moves linearly along the ball screw with the vertical screw nut seat. 3. The multi-axis forming mechanism of CNC coiling machine according to claim 1, characterized in that: the split slider device includes an upper slider, an adjustment plug iron, a lower slider base, and a plug iron guide seat; The slider is a cover structure, the upper surface is connected to the universal knife holder, and the bottom surface is concave to form a cavity for assembling the adjusting plug iron; the adjusting plug iron has two pieces, which are respectively attached to the left and right side walls of the cavity of the upper slider. A sliding groove is formed between them; the plug iron guide seat is located between two adjustable plug irons, matches the shape of the sliding groove, and is fixed to the lower slider base; the connection between the upper slider and the lower slider base is used to eliminate vertical ball wires. The extension spring of the gap between the rod and the vertical screw nut seat. 4. The multi-axis forming mechanism of the numerical control spring coiling machine as claimed in claim 3, characterized in that: the left and right sides of the upper slider are respectively provided with screw holes for installing the adjusting screw, and the adjusting screw is tightly against the adjusting plug iron; the base of the lower slider and the plug iron guide seat are bolted together, and at the same time pinned and positioned by pins. 5. The multi-axis forming mechanism of a digitally controlled spring coiling machine according to claim 3, wherein the sliding grooves formed between the two adjusting plug irons are dovetail grooves, V-shaped grooves, rectangular grooves, and diamond-shaped grooves. 6. The multi-axis forming mechanism of the numerical control spring coiling machine according to claim 1, characterized in that: the knife holder and the top spring pin knife holder are connected vertically by height adjustment screws, and horizontally through the pin bolts. position. 7. The multi-axis forming mechanism of a numerically controlled spring coiling machine according to any one of claims 1 to 6, wherein the variable diameter unit is located on a slide plate driven laterally by a horizontal power device, and the slide plate slides on a linear track. shift. 8. The multi-axis forming mechanism of numerically controlled spring coiling machine as claimed in claim 7, characterized in that: the horizontal power device includes a horizontal servo motor, a horizontal ball screw, and a horizontal screw nut seat; the fixed support is fixed on the horizontal motor The horizontal servo motor on the seat, its output shaft is connected with the horizontal ball screw, and the horizontal screw nut seat connected with the slide plate or connecting plate is put on the horizontal ball screw for linear motion. 9. The multi-axis forming mechanism of numerical control spring coiling machine as claimed in claim 7, characterized in that: there are two diameter-reducing units, and the slide plates of the two diameter-reducing units are integrated or fixedly connected into one body, and are subject to the same The horizontal driving device drives the sliding left and right. 10. The multi-axis forming mechanism of numerical control spring coiling machine as claimed in claim 9, characterized in that: said horizontal driving device includes a connecting rod, an eccentric wheel, and a horizontal servo motor; one end of the connecting rod is connected to drive a slide plate, and the other end is connected to a receiving Eccentric wheel driven by horizontal servo motor. 11. The multi-axis forming mechanism of numerical control spring coiling machine according to claim 7, characterized in that: the vertical servo motor and the horizontal servo motor are connected with the vertical ball screw and the horizontal ball screw by soft connection; the soft connection structure Including the coupling head and joint, the coupling head is a connecting pipe body with different apertures at both ends, which is supported on the motor fixing seat through bearings, one end of which is socketed with the output shaft of the servo motor, and the other end is socketed with the joint; the outer end of the joint is socketed with a ball screw , the inner end is pinned to the coupling head through the first pin, and at the same time the joint is pinned to the ball screw through the second pin, and the first pin is perpendicular to the second pin.

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