KR200236522Y1 - Foreign material removing bolt - Google Patents

Abstract

The present invention is a bolt for removing foreign matter having an outer diameter of a male thread corresponding to the valley diameter of a female thread, wherein on the outer diameter of the male thread, a coating film, a foreign substance, and a welding tee scattered around the female thread are cut and collected. Protrusions are formed, and the projections are characterized in that formed at least two, as seen in the longitudinal cross section of the bolt, when used as an assembly part, such as parts, such as automobiles, particularly parts connected to the engine, with a fastening function It provides sufficient fastening force and repeatedly peels off the coating film, foreign matter and welding tee of electrodeposition paint at various parts, and secures a space to accumulate peeled paint for individual screw pitches. And sufficient electrical conductivity.

Description

Foreign material removing bolt

The present invention relates to a bolt, and in particular, the product relates to a bolt used to remove foreign substances in the fastening portion of the bolt having a threaded portion, and has a plastic-processed screw continuously formed a groove corresponding to the lead portion of a predetermined threaded portion. It is configured to have a plurality of cut-out parts of the partially projected parts that are divided evenly in rows, and the welding of the automobile or shipbuilding industry with the function of removing the welding tee of the welded nut thread part of the general industrial site (including robot welding) The present invention relates to a foreign material removal bolt that can reduce the work resistance as much as possible by peeling off the coating film on the pre-painted part in the automobile or shipbuilding industry.

When used as assembly parts such as automobiles, especially engines, etc., it is possible to provide sufficient fastening force with function, and to peel off the coating of electrodeposition paint from several parts and to accumulate peeled paint for individual screw pitch. The present invention relates to a bolt capable of sufficiently securing the conduction performance under any tightening condition by providing a separate space.

In general, as shown in Fig. 1, the conventional bolt 10 is welded to the fixed panel together with a washer, for example, through a through hole of a fixed panel formed in an engine room (not shown) of an automobile. It is designed to be screwed into the female thread of the fixing nut.

In addition, such a conventional bolt is pre-deposited and fastened to the through-hole of the fixed panel previously electrodeposited, and the electrodeposition coating film, foreign matter or welding tee of the bolt male thread part 30 and the nut female thread part during such fastening. It has been adopted in a structure that is fastened to each other by forcible fastening of a predetermined torque or more, not to peel off.

In this conventional bolt fastening structure, the bolt consisting of the bolt head portion 11 and the male thread portion 13 formed with a screw thread, as shown in FIG. 1, is a hexagonal bolt or a two-cut or three to a flange bolt. After cutting, the shank of the bolt was press-fitted at intervals of 180 ° and used (see Fig. 2).

However, as shown in Figs. 1 and 2, the structure in which the plurality of press-fitting portions 15 are formed has a fear that the press-fitting jig is often broken, and the pressure applied during the press-fitting portion 15 processing is increased. As a result, the shank cross-sectional shape of the bolt 10 is deformed into an elliptical shape instead of a round shape, thereby causing excessive tightening torque and lowering work efficiency.

In addition, the existing bolt of this type requires a separate cutting process, which complicates the manufacturing process, and uses a single or a plurality of spring washers or flat washers to prevent recurrence. There was a problem.

On the other hand, in the case of intrinsic screw thread or screw thread, which is a problem of the quality of the screw parts, it is difficult to find and even if found, it has to be inspected one by one using a gauge for regeneration. That is, full purp is difficult and the quality control cost is excessive.

Therefore, the object of the present invention is made in view of the above-described problems, and is made in view of the various problems described above, and evenly removes the loosening prevention and the welding tee without a large clamping force, and also the screw portion of the nut It is not to invade, and moreover, the relaxation prevention is considered without using a separate washer.

In addition, when used as an assembly part such as an automobile, in particular, a part connected to an engine, it provides sufficient clamping force with function, and peels electrodeposited coating film, foreign material or welding tee from various parts, and then, for individual screw pitch. By separately providing a space for accumulating peeled paint, it is possible to provide a bolt capable of sufficiently securing the conduction performance under any fastening condition.

In order to realize the above object, in the bolt in which the outer diameter of the male thread corresponding to the valley diameter of the female thread of the nut is set, a protruding portion is formed at regular intervals by a roll die on the outer diameter of the male thread. And providing a cutout for removing foreign matter and weld tee, wherein the cutout cuts and peels off the coating film, the foreign matter and the weld tee regardless of the direction in which the tightening rotation force is applied when the bolt is bolted to the female thread. It is characterized in that formed to a sufficient size to strengthen the fastening support.

In addition, it is preferable that the pickled portion is formed in a mountain shape when viewed in the longitudinal direction of the screw.

In addition, it is preferable that each of the portions adjacent to the vertices of the pickled portion is raised at an angle smaller than the screw angle of the screw portion in the periphery thereof.

In addition, it is preferable that the pickled portion is twisted by a predetermined angle in one direction so that the extension lines drawn by the vertices thereof are curved in one direction when viewed from the entire threaded portion.

In addition, the valleys of the screw portion, when viewed from the entire screw portion, it is preferable that the extension line drawn by the vertices of the pickled portion is twisted by a predetermined angle in one direction so as to be curved in one direction.

In addition, the thread outer diameter part around the said cutting part may be formed in the shape corresponding to the female threaded part of a nut.

In addition, the twist direction in the cutout of the screw portion is preferably made of a curved shape in any one direction depending on the left or right screw.

In addition, it is preferable that two or more pickled portions are formed at regular intervals from the outer diameter of the thread when viewed from the longitudinal cross section of the bolt.

On the other hand, it may be made of a bowl with a polygonal hole formed with a polygon (including square, hexagon) in the bolt head portion with the above-described configuration.

1 is a schematic of a typical bolt,

2 is a cross-sectional view taken along the line A-A of FIG.

3 is a schematic view of a bolt according to the present invention;

4 is a perspective view of a bolt according to the present invention, and

FIG. 5 is an enlarged perspective view specifically showing the bolt of FIG. 4; FIG.

<Explanation of symbols for the main parts of the drawings>

40: bolt 41: head

43: bolt shank 45: male thread

50: outskirts 51: pickled

60: valley

3 is a schematic view of the bolt according to the present invention, FIG. 4 is a perspective view of the bolt according to the present invention, and FIG. 5 is an enlarged perspective view showing the bolt of FIG.

Reference numeral '40' is a hexagonal head annular bolt (also known as a flange bolt) exemplified as an example in the present invention, and an electrodeposition coating film, a foreign substance, and a coating portion of a bolt having a threaded portion 45 at its shank. A foreign material removal bolt used to remove the welding tee, and a polygonal hole-mounted bolt having a polygonal (square, hexagonal) hole 47 recessed in the longitudinal direction may be employed.

In addition, the foreign matter removal bolt 40 has a threaded portion which is press-fitted by a mold in which grooves corresponding to the lead portion of the threaded portion 43 having a predetermined angle are continuously formed, which is a conventional parallel array flat plate press-fit die. The description is the same as in the sliding rolling technique.

Further, when the screw portion 45 is viewed from the longitudinal section, a cutout portion 51 is formed which protrudes two or more radially from the outermost portion of the outermost portion, that is, the outer circumferential portion of the thread.

Further, each of the vertex portions of the pickled portion 51 extends from the inclined flat portion of the screw portion 45 to have a shape in which the end surface is collected at one point.

In addition, although the cross section external shape of the valley diameter part of the said screw part 45 is preferable as a conventional shape, it may be processed so that it may have a valley part of a hexagonal cross-section.

The outer portion 50 of the threaded portion 45 is twisted by a predetermined angle in one direction so that the extension lines drawn by the vertices of the pickled portion 51 are curved in one direction when viewed from the entire threaded portion 45.

Moreover, the twisting direction in the cutout part 51 of the said screw part is preferably made curved in any one direction selectively according to a left screw or a right screw.

In addition, the valley portion 60 of the threaded portion 45 may be used when the valley portion cross-sectional shape is circular, but when viewed from the entire threaded portion 45, the extension line drawn by the vertices of the hexagonal shape is curved in one direction. Each is twisted.

In other words, the extension lines extending the vertices of the pickled portion 51 is configured to form a curve gradually inclined in one direction.

Moreover, the vertex part of the said valley part 60 is located on the concentric line of the vertex part of the cutout part 51 adjacent to it.

On the other hand, in Fig. 1, reference numeral 20 denotes that when the hole into which the bolt is inserted is larger than the diameter of the bolt, when the contact surface is rough, when the contact surface is inclined, and a fixture such as steel, wood or rubber is used. A washer used in a bolt when it is weak against compression and needs to be prevented from falling down.

Next, the bolt for the present invention will be described.

First, the washer 20 is inserted through the shank 45 of the bolt, the center line of the shank 45 of the bolt and the center line of the fastening hole coincide with the fastening hole of the nut attached to the fixing body, and the screw is held at a constant torque. Put in Of course, when the washer 20 is not used, the fastening operation is started as it is.

During the fastening, since each of the vertex portions of the pickled portion 51 is pressed against the bone diameter portion of the female screw portion and rotated, the vertices of the cut portion 51 of the male screw portion 45 of the bolt are inserted into the female screw portion 45 of the nut. While pressing and rubbing on the ridge diameter portion of the bolt, the coating film and the foreign matter electrodeposited on the whole shank portion of the bolt and the entire nut are peeled off.

At this time, the coating film and the foreign matter peeled as described above are collected in an empty space between the female threaded bone part 60 of the nut and the male threaded outer part 50 of the bolt.

In addition, the coating film and the foreign matter removal bolt manufactured by the press-fired firing process by the die which was continuously baked by 2 to 4 equal parts of the individual pitch so as to be 90 ° to the lead angle at the angular position of the threaded part 13 (aka PC bolt) Has a twisted screw corresponding to the lead angle, reminiscent of the outward appearance of the partial corner. Each vertex of the outer part should be intentionally a vertex cross section by the design of the master. However, the minimum area generated during master machining is allowed.

In addition, the outer shape of the valley diameter portion of the screw portion is preferably circular.

In addition, the head part may be a flanged hexagonal bolt based on the economics of the conventional method.

Here, the bolt manufacturing technique is the same as the conventional bolt manufacturing technique, but the effective diameter in the existing method, a slight modification is required. The deformation amount is within 0.5% of the nominal thread.

In addition, the indentation depth of the indentation master (not shown here, using a flat press die) is approximately 80% of the thread effective diameter, and the thread cross section is the same as that of the 60 ° thread and the twist is 60 ° to 63. It is about °.

Normally, the valleys of the triangular screw of the coating film, foreign material and the welding tee removal bolt have a flat part by cutting the triangular part at a height of H / 5 so that the removed amount of the foreign material and paint is accommodated in this space.

In addition, when the quantity of coating film and the quantity of a foreign material are not large, you may cut and produce a triangular part at the height of H / 5.5. In the case of a thin coating film or when the fastening resistance is extremely low at the time of work, the height of H / 6 may be cut out and used. This is only an amount of change due to the amount of weld tee or the thickness of the plated coating, so it is appropriately adjusted. In any case, of course, so as not to damage the nut (NUT) or the bone of the female thread. This is another major feature that is consequently very important compared to the energized bolts damaging the nut female threads.

Therefore, the foreign matter removal bolt according to the present invention can be used as the earth bolt, when viewed from the cross-sectional view of the bolt and the nut is engaged, the crescent shape formed by the circular female thread bone 60 of the nut, and the hexagonal male thread outline of the bolt Since it is gathered in the space of, the vertex part of the cut part 51 of a bolt and the paint of the female threaded part 60 of a nut peeled off, and it will be a structure which can be easily energized.

In addition, the apex portion of the male thread at the front end of the shank nut can be peeled off the weld tee including the coating film and the foreign matter, and the cut portion 51 of the entire thread is continuously formed by the following radial cut portion 51. Because of the repeated frictional contact at the same position, it is possible to completely peel off the coating film, foreign matter and the welding tee applied to the female thread by the time it is completely tightened.

In addition, when the cross-sectional shape of the male thread cutout part 51 and the valley part 60 of the shank is polygonal at the time of tightening, since the extension lines of the cutout parts 51 of the external thread form a twisted curved shape, The contact point between the female thread of the nut and the inside of the nut is not in the same line as seen in the longitudinal direction of the nut, thereby performing the function of distributing frictional contact force, preventing breakage during tightening, and easily with a small tightening force. Can be tightened.

In addition, since the outer thread 50 of the bolt is formed to have a size existing between the effective diameter of the male screw and the thread valley diameter of the female thread 45 of the nut, the fastening support force based on the mutual contact force can be easily obtained. It will secure enough fastening support balance.

As described above, the bolt according to the present invention provides sufficient fastening force to a predetermined portion of the element for grafting the fastening function, and repeatedly deposits the coating film, foreign matter, welding tee, etc. of the electrodeposition paint at the cut portions at various positions. After continuously peeling off, the space for accumulating the peeled paint, foreign matter and welding tee for each screw pitch is individually provided. It is.

On the other hand, the preferred embodiment of the present invention has been described using a specific item, as described to describe the above object, but can be variously modified and changed without departing from the spirit or scope of the present invention as follows to be.

Claims (3)

In the bolt for removing foreign matter having the outer diameter of the male thread corresponding to the valley diameter of the female thread, On the outer diameter of the male thread, a protrusion for cutting and collecting the coating film, foreign matter and welding tee scattered around the female thread is formed, The protrusion is a foreign matter removal bolt, characterized in that formed in two or more, as seen on the longitudinal cross section of the bolt. The method of claim 1, The pickled portion of the bolt, characterized in that made of a ridge, when viewed in the longitudinal direction of the bolt. The method of claim 1, The pickled portion, characterized in that in the longitudinal direction of the bolt, a continuous line connecting the vertices is formed in a curved shape.