CN113664307A

CN113664307A - Speed-combination wire-moving automatic threading molybdenum wire linear cutting machine tool

Info

Publication number: CN113664307A
Application number: CN202111088655.5A
Authority: CN
Inventors: 胡忠权
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-09-16
Filing date: 2021-09-16
Publication date: 2021-11-19

Abstract

The invention provides a molybdenum wire cutting machine tool capable of automatically threading wires by combining fast and slow wire feeding, which is characterized by comprising a driving wire feeding wheel guide rail (1), a driving wire feeding wheel seat (2), a driving wire feeding wheel (3), a lead wire hook rodless cylinder (4), a lead wire hook (5), a molybdenum wire unhooking clamp (6), a waste wire take-up device (7), a wire lifting wheel (8) and a lead wire hook guider (9), the automatic threading device comprises a thread cutter (10), a molybdenum wire end bending clamp (11), a tension detector (12), a driven wire feeding wheel (13), a driven wire feeding wheel seat (14), a lower wire frame (15), an upper wire frame (16), a driving wire feeding wheel seat cylinder (17) and a driving wire feeding wheel motor (18).

Description

Speed-combination wire-moving automatic threading molybdenum wire linear cutting machine tool

Technical Field

The invention relates to a wire moving mode of an electric spark molybdenum wire cutting machine tool, in particular to an automatic threading technology.

Background

The existing electric spark molybdenum wire cutting machine tool adopts a fast wire moving and medium wire moving mode, and adopts a wire winding drum to wind a section of fixed molybdenum wire for reciprocating wire moving cutting, wherein the wire moving mode has the defects that 1, the molybdenum wire is loosened, and a cut workpiece has stripes; 2. the molybdenum wire can be worn and thinned, and the precision error of a cut workpiece occurs; 3. the replacement cost is high when the wire is accidentally broken; 4. the conversion cutting unit needs manual wire threading, and the labor cost is high, so a molybdenum wire cutting machine tool capable of combining speed and speed to thread wires automatically is needed to realize no loosening of the molybdenum wires, no change of wire diameter, low wire breaking cost and automatic threading.

Disclosure of Invention

The invention aims to solve the technical problem of the defects of the existing electric spark molybdenum wire cutting machine tool and provide a molybdenum wire cutting machine tool capable of automatically threading wires by combining speed and speed.

The invention provides a high-speed and low-speed combined wire walking automatic threading molybdenum wire cutting machine tool which is characterized by comprising a driving wire walking wheel guide rail (1), a driving wire walking wheel seat (2), a driving wire walking wheel (3), a wire leading hook rodless cylinder (4), a wire leading hook (5), a molybdenum wire unhooking clamp (6), a waste wire take-up device (7), a wire lifting wheel (8), a wire leading hook guider (9), a wire shearing device (10), a molybdenum wire end bending clamp (11), a tension detector (12), a driven wire walking wheel (13), a driven wire walking wheel seat (14), a lower wire frame (15), an upper wire frame (16), a driving wire walking wheel seat cylinder (17) and a driving wire walking wheel motor (18).

The driving wire feeding wheel guide rail (1) is arranged on the upper wire rack (16) and is used for changing the cutting and threading positions of the driving wire feeding wheel seat (2) under the pushing of the driving wire feeding wheel seat cylinder (17).

The driving wire moving wheel (3) and the driven wire moving wheel (13) are made of nylon or other light materials, the diameter is 100-200mm, the weight is less than 200 g, the thickness of the wheel is 15mm, and a groove with the depth of 2mm and the width of 12mm is formed in the outer diameter of the wheel;

a notch (31) is formed in the edge of a wheel body (33) of the driving wire walking wheel (3), a spring pressing sheet (32) is arranged at the notch, molybdenum wires on the outer side of the wheel can be guided into the groove and pressed tightly by the spring pressing sheet when the driving wire walking wheel rotates, a synchronous belt pulley (34) is arranged on a shaft of the driving wire walking wheel (3) and driven by a driving wire walking wheel motor (18), the shaft center is a circular hole (35) with the diameter of 2mm, and the driving wire walking wheel (3) is horizontally arranged on the driving wire walking wheel seat (2);

the lead hook rodless cylinder (4) is vertically fixed on the driving wire moving wheel seat (2), and a limit switch (41) is arranged on the side surface;

the lead hook (5) is a metal rod with the diameter of 0.6-1.5mm, the lower end of the lead hook is provided with a V-shaped notch which is in a hook shape, the upper end of the lead hook is fixed on a slide block (42) of the rodless cylinder (4) of the lead hook, and the lead hook can penetrate through an axial hole of the driving wire feeding wheel (3) when moving downwards;

the molybdenum wire unhooking clamp (6) is two metal sheets with steps, is driven by an air cylinder, is provided with a groove with the diameter of the lead hook at the upper half part during clamping, and is arranged at the lower end of the rodless air cylinder (4) of the lead hook;

the waste wire take-up device (7) consists of a take-up roller (71), a take-up roller motor (72), a take-up hook cylinder (73) and a roller cylinder (74), wherein the take-up roller separates a take-up hook and extends out of the take-up roller to pull a molybdenum wire into a waste wire box during take-up, the take-up roller tightly takes the waste wire into the waste wire box, and the waste wire take-up device is fixed on the driving wire travelling wheel seat (2);

the wire lifting wheel (8) consists of a rotary cylinder (81), a bracket (82) and a guide wheel (83) and is used for lifting the molybdenum wire so that the molybdenum wire is tightly attached to the lower edge of the driving wire walking wheel, and the wire lifting wheel is arranged on the upper wire rack (16);

the center of the lead hook guider (9) is provided with a funnel-shaped hole for accurately guiding the lead hook (5) into the workpiece threading hole, and the lead hook guider is arranged below the upper wire frame (16);

the thread trimmer (10) consists of an air cylinder (101) and a thread trimming knife (102) and is arranged on the thread dropping frame (15);

the molybdenum wire end bending clamp (11) consists of a rotary cylinder (111), a wire clamping claw (112), a wire clamping cylinder (113) and a shifting cylinder (114), and is arranged on the lower wire frame (15);

the tension detector (12) consists of a tension wheel (123), a spring (122) and a microswitch (121), and is arranged below the lower wire rack (15);

a vortex spring (132) is arranged between a wheel body (131) of the driven wire feeding wheel (13) and a fixed seat (133), the driven wire feeding wheel can be driven by the driving wire feeding wheel to rotate for more than 5 circles under the action of the vortex spring when the fixed seat (133) does not rotate, sufficient tension of molybdenum wires is kept, the fixed seat of the driven wire feeding wheel is installed on a shaft of a numerical control motor (134), and the driven wire feeding wheel (13) is installed below the lower wire frame (15).

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of an active feed wheel;

FIG. 3 is a schematic view of a rodless cylinder of the wire hook;

FIG. 4 is a schematic view of a lead hook end;

FIG. 5 is a schematic view of a molybdenum wire unhooking clip;

FIG. 6 is a schematic view of a waste wire take-up;

FIG. 7 is a schematic view of a wire lifting wheel;

FIG. 8 is a schematic view of a lead hook guide;

FIG. 9 is a schematic view of a wire cutter;

FIG. 10 is a schematic view of molybdenum wire end bend clamps;

FIG. 11 is a schematic view of a tension detector;

FIG. 12 is a schematic view of a driven feed wheel;

FIG. 13 is a schematic view of the position of the active feed roller in threading condition;

FIG. 14 is a schematic view of the clamping jaws clamping the molybdenum wire;

FIG. 15 is a schematic view of the wire clamping claw clamping the molybdenum wire rotated 90 degrees and the wire guiding hook extending into the molybdenum wire clamping claw;

fig. 16 is a schematic view showing the wire hook hooking the molybdenum wire.

The specific implementation mode is as follows:

the technical scheme adopted by the invention for solving the problems is as follows: the molybdenum wire is fed by a driving wire feeding wheel and a driven wire feeding wheel together, a new molybdenum wire of 300-400 m is wound on the driven wire feeding wheel, one end of the new molybdenum wire penetrates through a workpiece and is fixed on the driving wire feeding wheel, the driving wire feeding wheel is driven by a servo motor to rotate in the forward and reverse directions, the rotation speed is more than 1000 revolutions per minute, the driving wire feeding wheel drives the driven wire feeding wheel to rotate in the forward direction through the molybdenum wire while a vortex force spring is tightened, the molybdenum wire is wound to the driving wire feeding wheel by the driven wire feeding wheel, the vortex force spring is released to drive the driven wire feeding wheel to rotate in the reverse direction when the driving wire feeding wheel rotates in the reverse direction, the molybdenum wire is wound to the driven wire feeding wheel by the driving wire feeding wheel, the rotation direction of the molybdenum wire is rapidly changed through the driving wire feeding wheel, meanwhile, the forward rotation angle of the driving wire feeding wheel is controlled by a numerical control motor to be larger than the reverse rotation angle so that the molybdenum wire cutting the workpiece is continuously updated, a lower wire frame is provided with a molybdenum wire tension detector, and when the vortex force spring is too tight, the tension detector outputs a signal to control the driven wire feeding wheel seat motor to rotate in the forward direction so that the tension of the driven wire feeding wheel to keep the normal tension of the molybdenum wire.

The automatic threading process of the invention is described below with reference to the accompanying drawings:

the method comprises the following steps: the take-up roller (71) of the waste wire take-up device (7) is loosened, the take-up hook (73) extends out to pull the molybdenum wire into the space between the take-up rollers (71), and the take-up rollers (71) are tightened;

step two: the wire clamping claw (112) extends forwards and clamps the molybdenum wire, the lead wire hook (5) descends by 5mm, and the molybdenum wire is unhooked by the molybdenum wire unhooking clamp (6);

step three: the wire cutting device (10) cuts wires, the molybdenum wire unhooking clamp (6) is opened, the driving wire feeding wheel (3) rotates reversely at 10 circles per minute, and the wire take-up roller motor (72) is started to transfer waste wires into a waste wire box;

step four: the wire clamping claw (112) rotates by 90 degrees;

moving the workpiece to the next cutting unit;

step six: the wire lifting wheel (8) descends;

step seven: the active wire moving wheel seat (2) moves to a threading position;

step eight: the lead hook (5) moves downwards and sequentially passes through the center hole of the driving wire walking wheel (3), the lead hook guider (9), the workpiece wire threading hole and the wire clamping claw (112);

step nine: the lead wire hook (5) rises to hook and pull up the end part of the molybdenum wire, the end part of the molybdenum wire is pulled into an acute angle shape by using the friction force of the wire clamping claw (112), and the wire clamping claw (112) is loosened and retreated;

step ten: the lead hook (5) pulls the end part of the molybdenum wire to the upper part of the molybdenum wire unhooking clamp (6);

step eleven: the molybdenum wire is clamped by a unhooking clamp (6)

Step eleven: the driving wire moving wheel seat (2) moves to a normal cutting position;

step twelve, the wire lifting wheel (8) is lifted to ensure that the molybdenum wires are tightly attached to the lower edge of the driving wire moving wheel (3);

step thirteen: the driving wire feeding wheel (3) rotates forwards for a circle, so that the molybdenum wire enters the outer edge groove from the gap at the edge of the driving wire feeding wheel (3), and the threading is completed;

the actions are controlled by a PLC, and the end part of the molybdenum wire needs to be manually placed into a wire clamping claw (112) for the first threading and accidental wire breakage and the PLC is started to control the threading action.

Claims

1. A fast and slow combined wire-moving method for molybdenum wire cutting machine is characterized by that one segment of molybdenum wire used for cutting workpiece is reciprocally moved at the linear speed of 10-2000 m/min to cut workpiece and at the same time is continuously renewed at the linear speed of 0-2 m/min.

2. An automatic wire-threading method for molybdenum wire linear cutting machine is characterized by that the working table for fixing the workpiece to be cut is flat

One side of the surface has a bar-shaped object controlled by an automatic device, the other side has a molybdenum wire for cutting, and the bar is controlled by the automatic device

The axial movement of the forming object draws the end of the molybdenum wire on the opposite side to the side where the forming object is located and automatically fixes the forming object on the wire moving device.

3. The wire feeding device of a molybdenum wire cutting machine as claimed in claim 1, comprising a driving wire feeding wheel and a driven wire feeding wheel with a spiral spring, wherein the driving wire feeding wheel is driven by a numerical control motor in forward rotation and drives the driven wire feeding wheel to rotate in forward rotation while tightening the spiral spring of the driven wire feeding wheel, the driving wire feeding wheel is driven by the numerical control motor in reverse rotation, and the spiral spring of the driven wire feeding wheel releases to drive the driven wire feeding wheel to rotate in reverse rotation and is synchronous with the driving wire feeding wheel and maintain the tension of the molybdenum wire.

4. The wire feeding device of a molybdenum wire linear cutting machine as claimed in claim 3, wherein the molybdenum wire is continuously updated during reciprocating motion by controlling the rotation angle difference between the positive and negative directions of the driving wire feeding wheel and the driven wire feeding wheel through a numerical control motor.

5. The automatic threading device of molybdenum wire linear cutting machine according to claim 2, characterized in that the end of the bar pulling the molybdenum wire controlled by the automatic device is hook-shaped.

6. The automatic threading device of fast and slow combination threading according to claim 4 and 5, characterized by comprising a driving threading wheel, a threading hook, a molybdenum wire unhooking clamp, a waste wire take-up device, a wire lifting wheel, a wire cutting device, a molybdenum wire end bending clamp and a driven threading wheel, wherein the driving threading wheel can move horizontally, the center of the driving threading wheel is provided with a round hole for the automatic threading bar to pass through, and the edge of the driving threading wheel is provided with a notch for guiding the molybdenum wire.

7. A molybdenum wire cutting machine according to the wire running method of claim 1.

8. A molybdenum wire cutting machine of the automatic wire threading method according to claim 2.

9. A molybdenum wire cutting machine equipped with a combined fast and slow wire feeding automatic wire feeding device according to claim 6.