JP2549270Y2 - Screw tip with copper packing used for spot welding electrodes - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE devised, electricity for spot welding
The present invention relates to a screw tip which is used for a pole and has a step formed from a tip cylinder and a thread is threaded on a cylindrical portion extending rearward.

[0002]

2. Description of the Related Art A tip for spot welding is mounted on the tip of a tip holder. However, there is a possibility that the mounting portion of the tip may be overheated by welding. Therefore, a cooling water passage is formed in the chip holder to cool the vicinity of the mounting portion of the chip. In such a case, a copper packing is provided to prevent leakage of cooling water from the end of the mounting portion of the chip and to improve conductivity (for example, Japanese Utility Model Application Laid-Open No. 2-482).
No. 89).

[0003] When a screw tip is to be attached to the chip holder, a copper packing 12 prepared in advance is inserted into a screw tip 11 prepared in advance, and the state shown in FIG. 2 is attached to the tip of the chip holder. It is.

[0004]

In the above-mentioned conventional technique, when the copper packing 12 is inserted into the screw tip 11, the hole 13 of the copper packing 12 passes through the thread 14 of the screw tip 11. Therefore, the diameter of the hole 13 must be larger than the diameter of the screw thread 14. Therefore, it takes a lot of time to insert and remove the packing, and the thread 14 of the screw tip 11 and the copper packing 1
There is a problem that a gap is formed between the two holes 13 and the contact area between the screw tip 11 and the copper packing 12 and the contact area between the copper packing 12 and the chip holder are reduced, resulting in poor sealing performance.

[0005] The present invention has been made in view of the above-mentioned problems of the prior art, and a purpose thereof is to insert a packing into a screw chip before rolling the screw into the chip. By spot welding
It is an object of the present invention to provide a screw tip with copper packing which can be easily attached without removing the packing when the electrode is used for an electrode , and can be easily mounted without removing the packing.

[0006]

In order to achieve the above object, the screw tip with copper packing used for the electrode for spot welding according to the present invention is provided between the tip body and the screw portion. The present invention is characterized in that a copper packing having a hole diameter smaller than a mountain diameter is arranged.

[0007]

When a copper gasket having a hole having a diameter substantially the same as the small diameter is inserted into a small diameter portion where the screw is formed before the screw of the screw tip is rolled, and the screw is threaded by rolling, the hole diameter of the copper gasket becomes It is smaller than the screw thread diameter. In this way, by inserting the copper packing into the screw tip in advance, the time and effort for attaching the screw tip to the chip holder can be omitted, and the packing does not come off at that time. In addition, when the screw tip with the copper packing is attached to the chip holder, the hole diameter of the copper packing is small and the copper packing comes into close contact with the upper end shaft of the screw part, so that the sealing property is improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. In the figure, reference numeral 1 denotes a screw tip, which comprises a body 2 and a screw 4 extending from a step 3 behind the body. A copper packing 5 is previously inserted between the step 3 and the screw portion 4 of the screw tip 1 to form a screw tip with copper packing as a whole.

In order to insert the copper packing 5 into the screw chip 1, for example, the chip body 2 is formed from the material of the screw chip 1, the step 3 is finished by machining, and the screw of the screw chip is rolled. A copper packing 5 having a hole 6 having substantially the same diameter as the small diameter is inserted into the small diameter portion where the previous screw is formed, and a screw is formed by thread-rolling the small diameter portion with the copper packing 5 inserted. Then, the screw portion 4 is formed. By doing so, the diameter of the hole 6 of the copper packing 5 is smaller than the crest diameter of the screw portion 4, and the copper packing 5 is securely held on the screw chip 1.

[0010] Then, in order to attach the screw tip with copper packing according to the present invention to a tip holder (not shown),
It is only necessary to screw the screw portion 4 of the screw tip with copper packing into a screw hole formed at the tip of the tip holder.

[0011]

[Effect of the Invention] According to this invention, since the copper packing is inserted in the screw tip in advance, the work of mounting the chip to the chip holder can be omitted, and at this time, the hole diameter of the packing is smaller than the diameter of the thread of the screw tip. So that the packing does not come off. Moreover, the copper packing
When using a threaded screw tip as an electrode for spot welding
In addition, when the screw tip with copper packing is attached to the chip holder, the hole diameter of the copper packing is small and it is in close contact with the upper end of the screw part, and the contact area between the screw chip and copper packing and the contact area between the copper packing and the chip holder are small. Since it is large, the sealing property is remarkably improved.

[Brief description of the drawings]

FIG. 1 is a side view of a screw tip with copper packing according to the present invention.

FIG. 2 is a side view of a conventional example in which a copper packing is inserted into a screw tip.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Screw tip 2 Tip cylinder 3 Step 4 Screw part 5 Copper packing 6 Hole formed in copper packing

Claims (1)

(57) [Scope of request for utility model registration] 1. A screw tip for spot welding in which a screw is threaded on a cylindrical portion extending rearward with a step provided from a tip cylinder, wherein a diameter of the screw between the tip cylinder and the thread portion is smaller than a thread diameter of the screw. A screw tip with a copper packing used for an electrode for spot welding, wherein a copper packing having a hole diameter is arranged.