JP2814372B2 - Chip dresser and dressing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tip dresser for cutting and shaping a welding tip serving as a welding electrode, and a dressing method therefor.

[0002]

2. Description of the Related Art In general, various means have been disclosed for cutting and shaping a welding tip. A cutting tool is rotated from a motor driven by compressed air, hydraulic pressure, or electricity via a gear, a belt, or a chain. A tip dresser for cutting and shaping a welding tip with the cutting tool is used.

[0003] In this case, the pressing force at the time of dressing the welding tip is performed with the same force as at the time of welding. Also, the discharge of chips generated by cutting has been performed by blowing compressed air from the outside.

[0004]

However, according to the prior art, there are the following problems. Since the pressing force at the time of setting and dressing of the welding tip is performed with the same force as at the time of welding, the impact force at the time of pressing often causes the cutting edge to be broken, which hinders the cutting of the welding tip.

[0005] As for the discharge of chips, means for discharging chips by blowing compressed air from the outside is used.
This is because the compressed air is ejected from one external location during the rotation of the cutting tool, so that the ratio of the discharged amount to the used amount of the compressed air is inefficient, and it is not possible to discharge the chips sufficiently.
As a result, clogging may occur with the chips, which may lead to loss of the cutting tool and a reduction in work efficiency, which may hinder the work.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a tip dresser that is economical and has excellent work efficiency while preventing damage to a cutting blade.

[0007]

The present invention has the following configuration to solve this problem. In other words, the welding tip
Press against the cutting tool and rotate the cutting tool relative to the welding tip
While cutting and shaping the welding tip
In the dresser, press the welding tip against the cutting tool.
The applied pressing force can be changed in stages.
In addition, a tip dresser equipped with a pressing device capable of maintaining the pressing force at each stage for a certain time was used .

[0008] The pressing device may include a tip dresser.
Press with the first pressing force when setting the welding tip to
When cutting the side surface of the welding tip, the second pressing
Pressing and cutting the welding tip with force, the end of the welding tip
When cutting surfaces and side surfaces, the third pressing force
The feature is to press the pump.

Further, the pressing device is provided with a control circuit for an electric system.
It has a control circuit for the road and air system, and controls the electric system.
Control circuit and the air system control circuit
Control may be performed.

And a welding tip for shaping the welding tip.
In the method of dressing a tip, the cutting tool is welded to the
The pressing force applied to the chip is changed in stages,
In addition, the pressing force at each stage is maintained for a certain period of time and the welding
The tip is pressed with a first pressing force when the welding tip is set in the tip dresser, and the welding is performed with a second pressing force when cutting the side surface of the welding tip. cutting presses the chips, cutting while varying the pressing force of the welding tip to the cutting tool to cut by pressing the welding tip in the third pressing force when cutting the end surface and the side surface of the welding tip I decided to shape it.

[0011]

[Operation] According to the present invention, the following operation is performed. In the tip dresser provided with the pressing device, the welding tip is pressed against the cutting tool by the pressing device, and the pressing force can be changed. Therefore, when the welding tip is set on the tip dresser, the welding tip is weakly cut. Sometimes it can be stronger. Therefore, the impact force to the cutting tool when setting the welding tip to the tip dresser can be reduced, and the cutting blade can be prevented from being damaged by the pressing force.

In the above-mentioned tip dresser having an air outlet, compressed air introduced from an inlet formed in the housing is passed through a passage formed between the housing and the dresser gear. The cutting chips are ejected to the front surface, and the cutting chips are removed from the inside of the holder to the outside by the compressed air. As described above, since compressed air is ejected from the inside of the holder and compressed air is ejected from the front surface of the cutting edge, cutting chips can be efficiently removed.

Furthermore, in the dressing method, when the welding tip is set on the tip dresser, the first weak tip is set .
Since the welding tip is pressed by the pressing force , the impact force on the cutting tool when the welding tip is set on the tip dresser can be reduced, and the cutting blade can be prevented from being damaged by the pressing force. Also, when cutting both the end face and the side face of the welding tip, the third pressing force, that is, the welding tip is pressed and cut with a weaker force than the side face cutting, so that both the end face and the side face of the welding tip are cut. Even with this, the load on the device such as the cutting tool can be reduced.

[0014]

An embodiment of the present invention will be described with reference to the drawings.
1 of the drawings is a side view of the chip dresser, FIG. 2 is an enlarged side view of a main part of the chip dresser, and FIG. 3 is III-III in FIG.
4 is a plan view of the holder, and FIG.
FIG. 6 is a sectional view taken along line VI-VI of FIG. 4, and FIG.
8 is a circuit diagram of the pressing device, and FIG. 9 is a pressure setting diagram of the pressing device.

As shown in FIGS. 1 and 2, the tip dresser A includes a driving motor 10 fixed to a casing B via a fixing plate C, and a pinion gear supported by a shaft of the motor 10 inserted into the casing B. 11 and
An idle gear 12, which is supported by a shaft inserted into the casing B and meshes with the pinion gear 11, and is engaged between the end housing E and the upper housing U fixed to the casing B via an annular metal M and meshes with the idle gear 12. Dresser gear 13 and holder 1 fixed to dresser gear 13 via plate PL
Consists of

As shown in FIGS. 2 and 3, the holder 1 has a substantially disk shape, and includes a side cutting tool 2 for cutting the side surface of the welding tip W into a through hole formed at the center and an end cutting tool 3 for cutting the end surface thereof. It is fitted between the recess of the dresser gear 13 and the recess of the plate PL and is located at the center of the dresser gear 13. In addition, holder 1
The dowel pin 13 is inserted into the insertion hole 1b of the holder 1 to prevent the holder 1 from rotating.
Is attached to the base with bolts 14. A fixed bush 8 is fixed to a central hole of the upper housing U and the end housing E communicating with the through hole of the holder 1 by a bolt 9.

A metal fitting 16 is provided in the upper housing U by forming a compressed air intake 16a, and a hose 17 for supplying compressed air from an air compressor (not shown) is connected to the metal fitting 16. A long groove serving as a compressed air passage 15 is formed in the convex portion on the upper surface of the plate PL and the convex portion on the lower surface of the dresser gear 13, and one end of the long groove extends from the front surface of the cutting blade of the side cutting tool 2 to the compressed air. Is an air jet port 19 for jetting air. The passages 15 are formed by the long grooves formed in the plate PL and the dresser gear 13 and the upper housing U and the end housing E, respectively, and communicate with the inside of the upper housing U and the inside of the end housing E via the inside of the knock pin 7.

Compressed air supplied from an air compressor (not shown) via a hose 17 and a fitting 16 is supplied to a plate P
It is introduced into the space between L and the upper housing U, and is supplied from the air outlet 19 to the tip of the upper cutting edge of the side cutting tool 2 through the passage 15 on the plate PL side. The supplied compressed air is discharged to the outside through the discharge port 18 together with the cutting chips. The compressed air that has passed through the inside of the knock pin 7 passes through the passage 15 of the dresser gear 13 and is supplied from the air outlet 19 to the tip of the lower cutting edge of the side cutting tool 2. The supplied compressed air is discharged to the outside through the discharge port 18 together with the cutting chips. Therefore, the holder
Compressed air is blown out of the inside of
Compressed air is blown out of the machine, which helps to remove cutting chips.
The rate can be good. In other words, cutting chips
Clogging can be prevented, resulting in loss of cutting tools and reduced work efficiency.
Can be prevented to prevent the work from being hindered.

As shown in FIG. 4 to FIG.
It is composed of two triangular tips, and the triangular tips are arranged so that the cutting surface of each triangular tip forms the center of rotation and the upper and lower welding tips W facing each other are cut on the two faces of the triangular tip. Each triangular tip is fixed with a bolt 6 so that one end is pressed against the back surface 1a of the holder 1 and backed up.

The end-face cutting tool 3 is a rod-type cutting tool material, which is provided at a position substantially perpendicular to the side-face cutting tool 2, and has a cutting edge having a slant angle from a portion slightly above the center at a substantially central portion of the cutting tool material. And a clearance angle is formed on both sides of the cutting edge, and a width across the surface is formed in a direction perpendicular to the cutting edge. The cutting tool material is fitted into the holder 1 from the outer peripheral direction, and its ends are fixed by push bolts 4 and positioned by positioning bolts 5.

As shown in FIG. 8, the tip dresser A presses the welding tip W against the side cutting tool 2 and the end cutting tool 3 and reduces the pressing force on the side cutting tool 2 and the end cutting tool 3.
There is provided a pressing device 20 that changes in steps . The pressing device 20 includes an electric control circuit 21 and an air-based operation circuit 22. The control circuit 21 has a welding tip W
A pressurizing circuit 23 that outputs a pressurizing signal corresponding to the set pressurizing force, a drive circuit 24 that outputs a drive current corresponding to the pressurizing signal set from the pressurizing circuit 23, and a pressurizing cylinder 29. The pressurizing cylinder control circuit 25 outputs a control signal for controlling the operation. The operation circuit 22 is an air circuit for operating the pressurizing cylinder 29, and includes an electropneumatic proportional valve 26 and a pressure reducing valve 27 for controlling pressurized air to a pressure value proportional to the drive current from the drive circuit 24, and a pressurized cylinder control circuit. The switching valve 28 operates in response to a control signal from the controller 25 and switches the air circuit to switch the operation and the operation direction of the pressurizing cylinder 29.

An upper welding tip W is attached to the tip of the rod of the pressure cylinder 29, and the holder 1 of the tip dresser A is held between the tip of the upper welding tip W and the tip of the lower welding tip W. Then, the upper and lower welding tips W are pressed and cut. When the lower welding tip W is fixed, the tip dresser A may be in a free state in the vertical direction, and when the tip dresser A is fixed, the lower welding tip W may be fixed.
The pressing device 20 may be provided. Thus, the pressing forces of the upper and lower welding tips W are made equal.

The setting signal from the setting pressurizing circuit 23 is converted into a driving current by the driving circuit 24 and transmitted to the electropneumatic proportional valve 26. As a result, the electropneumatic proportional valve 26 operates and the pressure reducing valve 27
With this, the air pressure of the pressurized air is adjusted. On the other hand, the switching valve 28 is operated by a control signal from the pressurizing cylinder control circuit 25. Thus, the operation direction of the pressurizing cylinder 29 and the pressing force of the welding tip W are controlled.

Further, as the pressing device 20 is shown in FIG. 9 three
The pressure setting is divided into stages . This pressure setting diagram
The horizontal axis represents time T (sec), and the vertical axis represents pressure P (Kg / cm2).
Where T0 is the total cutting time. First, at the welding tip setting time T1, the set pressure is set as low as P1 (welding tip setting pressure) "first pressing force".
2 (weld tip side cutting pressure) Increases to "second pressing force" and maintains P2 until the welding tip side cutting time T2 ends. Next, before cutting the end face of the welding tip W,
P3 (weld tip end surface cutting pressure) Reduced to "third pressing force", and P3 is maintained until welding tip end cutting time T3 ends.
Is to be maintained.

Next, the operation and operation of the tip dresser A will be described. First, when the motor 10 operates, the dresser gear 13 rotates via the pinion gear 11 and the idle gear 12, and the side cutting tools 2 and the end cutting tools 3 of the holder 1 operate. Next, the operation circuit 22 is operated by the control circuit 21 of the pressing device 20, and the pressurizing cylinder 2 is operated.
The rod 9 extends to move the welding tip W into the holder 1. According to the setting of the pressing device 20, the welding tip W is pressed and set by a weak force (P1) (first pressing force) . When the welding tip W moves and changes from the set state to the side cutting state, the welding tip W exerts a strong force (P2) (second pressing ) .
Pressure) and the side surface of the welding tip W is cut by the side cutting tool 2. Further, when the welding tip W moves to change from the side cutting state to the end cutting state, the welding tip W is pressed by a relatively weak force (P3) (third pressing force) , and the welding tip W is formed by the end face cutting tool 3 and the side cutting tool 2. The end face and side face of W are cut. Thus, the welding tip W is cut and shaped. On the other hand, the cutting chips generated by the cutting are discharged to the outside by compressed air ejected from the air ejection port 19.

As described above, since the pressing force at the time of setting the welding tip W can be reduced by the pressing device, the impact force applied to the side cutting tool 2 at the start of cutting can be reduced, and the cutting blade can be damaged. Can be prevented. Further, the compressed air can be constantly supplied to the rotating side cutting tool 2 by the passage 15, and clogging by cutting chips and damage of the cutting blade due to the clogging can be prevented. Therefore, the replacement of the cutting tool for cutting the welding tip W can be extremely reduced, and the working efficiency can be improved.

The present invention is not limited to this embodiment.
For example, although the electro-pneumatic proportional valve is used as the pressing device, the switching may be performed as needed using a plurality of switching valves and a pressure reducing valve.

[0028]

As described above, the present invention has the following advantages. Since a pressing device that presses the welding tip against the cutting tool and changes the pressing force on the cutting tool is provided, it can be weak when setting the welding tip on the tip dresser and strong when cutting the welding tip. Therefore, the impact force to the cutting tool at the time of setting can be weakened, and the breakage of the cutting blade due to the pressing force can be prevented.

[0029]

Further, in the dressing method of the present invention, when the welding tip is set on the tip dresser, the welding tip is pressed with a weak force (first pressing force) , so that the impact force on the cutting tool during setting is reduced. To prevent the cutting blade from being damaged by the pressing force. Also,
When cutting both the end face and the side face of the welding tip, a relatively weak force (third pressing force), that is, the welding tip is pressed and cut with a weaker force than the side face cutting. Even if both are cut, the load on the device such as a cutting tool can be reduced. Therefore, it is possible to prevent trouble in cutting the welding tip.

As described above, it is possible to reduce the cost of the cutting tool and the labor required for replacement and the like, thereby improving the working efficiency.

[Brief description of the drawings]

FIG. 1 is a side view of a tip dresser according to an embodiment of the present invention.

FIG. 2 is an enlarged side view of a main part of the tip dresser according to the embodiment of the present invention.

FIG. 3 is a sectional view taken along line III-III of FIG. 2 according to the embodiment of the present invention.

FIG. 4 is a plan view of a holder according to the embodiment of the present invention.

FIG. 5 is a sectional view taken along line VV of FIG. 4 according to the embodiment of the present invention.

FIG. 6 is a sectional view taken along line VI-VI of FIG. 4 according to the embodiment of the present invention.

FIG. 7 is an enlarged plan view of a central portion of FIG. 3 according to the embodiment of the present invention.

FIG. 8 is a circuit diagram of a pressing device according to an embodiment of the present invention.

FIG. 9 is a pressure setting diagram of the pressing device according to the embodiment of the present invention.

[Explanation of symbols]

A: Tip dresser B: Casing C: Fixed plate E: End housing (housing) M: Metal PL: Plate P: Pressure P1: Welding tip set pressure P2: Welding tip side cutting pressure P3: Welding tip end cutting pressure T: Time T0: Total cutting time T1: Welding tip setting time T2: Welding tip side cutting time T3: Welding tip end cutting time U: Upper housing (housing) W: Welding tip 1: Holder 1a: Back side 1b: Insertion hole 2: Side cutting tool 3: End face cutting tool 4: Push bolt 5: Positioning bolt 6: Bolt 7: Dowel pin 8: Bush 9: Bolt 10: Motor 11: Pinion gear 12: Idle gear 13: Dresser gear 14: Bolt 15: Passage 16: Metal fitting 16a: Inlet 17: Hose 18: Outlet 19: Air Spout 20: Pressing device 21: Control circuit 22: Operating circuit 23: Setting pressurizing circuit 24: Drive circuit 25: Pressurizing cylinder control circuit 26: Electro-pneumatic proportional valve 27: Pressure reducing valve 28: Switching valve 29: Pressurizing cylinder

──────────────────────────────────────────────────の Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B23K 11/30

Claims (5)

(57) [Claims] 1. A tip dresser for cutting and shaping the welding tip while pressing the welding tip against the cutting tool and rotating the cutting tool relative to the welding tip, comprising:
Can be changed separately, and the pressing force at each stage
Characterized in that it is provided with a pressing device capable of maintaining the pressure for a certain period of time . 2. The pressing device presses a welding tip with a first pressing force when setting a welding tip on a tip dresser, and presses a welding tip with a second pressing force when cutting a side surface of the welding tip. The tip dresser according to claim 1, wherein when cutting the end face and the side face of the welding tip, the welding tip is pressed with a third pressing force. 3. A pre-Symbol pressing device, the control circuit and the error of the electrical system
And a control circuit for the electric system.
The pressing force is controlled by an air-based control circuit.
The method according to claim 1 or 2, wherein
Tip dresser. 4. A weld tip against the cutting tool, while relatively rotating the blade to the welding tip, the dressing method of welding tip shaping by cutting the welding tip is pressed against the blade to the welding tip press Pressure, stage
And the pressing force at each stage for a certain period of time.
A method for dressing a welding tip, characterized in that the cutting of the welding tip is performed while maintaining . 5. The method for dressing a welding tip according to claim 4, wherein the first welding tip is set when the welding tip is set on the tip dresser.
When pressing the welding tip with a second pressing force, the welding tip is pressed with a second pressing force to cut the side face of the welding tip, and when cutting the end face and the side face of the welding tip, the welding is performed with a third pressing force. welding tip dressing method characterized by switching cutting to integer <br/> form while changing the pressing force of the welding tip to the cutting tool to cut by pressing the chip.