TW202000361A - Screw tap and method of using the same - Google Patents

Abstract

A screw tap is provided, including a main body. The main body includes a driving portion and a tapping section which are connected with each other. The driving portion includes a first connection portion and a second connection portion. The first connection portion is adapted for being connected with a first driving tool. The second connection portion is adapted for being connected with a second driving tool. A plurality of blades are disposed on the tapping section.

Description

Screw tap and method of using the same

The invention relates to a tapping tool, in particular to a screw tap.

Screw taps, also known as screw taps, screw taps, or taps, are intended to be screw taps. They are specially designed to process a borehole so that the hole wall of the borehole forms an internal thread for screwing. Obviously, the screw tap is a processing tool for processing internal threads, so the screw tap is completely different from the screw that is generally used to connect and locate different objects in terms of the overall structure or the effect achieved.

Generally, screw taps are usually used with screw tap wrenches. Screw tap wrenches are joined by clamping the square head of the screw tap, and then the screw tap wrench is manually driven to drive the screw tap to rotate to perform the tapping operation.

However, in the actual processing, it is often the case that the position of the screw tap wrench clamping is wrong in operation. For example: the screw tap wrench is clamped to the round bar of the screw tap to cause damage, the screw tap wrench is not deep enough to cause detachment, The combination of the screw tap wrench and the square head is incorrectly caused by damage and many other combination errors, and there are shortcomings that need to be improved.

Therefore, it is necessary to provide a novel and progressive screw tap and a method of using the screw tap to solve the above problems.

The main purpose of the present invention is to provide a screw tap and a method of using the same, so that the user can select the first set of connecting parts or the second set of connecting parts to connect with two different driving tools, that is, screws There are two types of connection methods that can fully meet different needs.

To achieve the above object, the present invention provides a screw tap, including: a body. The main body includes a driving part and a tapping segment connected to each other. The driving part includes a first group connecting part and a second group connecting part. The first group connecting part is used for connecting with a first driving tool. The second assembling part is for assembling with a second driving tool, and a plurality of cutting edge parts are provided on the tapping section.

To achieve the above object, the present invention provides a method of using a screw tap, which includes the following steps: providing an object, the object including a perforation; providing a screw tap, the screw tap includes a body, the body includes a configuration along an axis And a driving part and a tapping segment connected, the driving part includes a first group connecting part and a second group connecting part, the tapping segment includes a tapered head and a body part, the head The outer contour is a smooth surface, the body is surrounded by a plurality of blades, the maximum outer diameter of the plurality of blades is not less than the maximum outer diameter of the head; provide a driving tool; a first tapping step, the screw The part of the tapping head is inserted into the perforation, and the other part of the head is against the hole edge of the perforation; a second tapping step, the driving tool is selectively assembled with the first assembly part And one of the second joints, and then the driving tool and the screw tap have the same rotation relationship; a third tapping step, driving the driving tool to drive the screw tap to rotate and force the screw tap to extend along the perforation Into the object, wherein the head is used to expand the perforation, and the plurality of blades are used to cut the hole wall of the perforation.

The following merely illustrates the possible implementation forms of the present invention with examples, but it is not intended to limit the scope of the invention to be protected, and will be described first.

Please refer to FIGS. 1 to 9, which show a preferred embodiment of the present invention. The screw tap of the present invention includes a body 1.

More specifically, the body 1 includes a driving part 2 and a tapping segment 3 connected to each other. The driving part 2 includes a first group connecting part 21 and a second group connecting part 22, the first group connecting The portion 21 is used for assembling with a first driving tool 61 (such as hand tools, pneumatic tools, electric tools, etc.), and the second assembling portion 22 is used for assembling with a second driving tool 62 in the tapping section 3 The plural blade portion 36 is provided. Wherein, the outer diameter of the driving part 2 is larger than the outer diameter of the tapping segment 3, the driving part 2 and the tapping segment 3 are arranged coaxially along an axis 4,

More specifically, the first assembly portion 21 is a polygonal bump, and the first assembly portion 21 is used for the first driving tool 61 to be sleeved and coupled. The sleeved connection method is very convenient and fast in operation. The combination position is easy to understand and clear, so the first driving tool 61 can stably drive the screw tap to rotate, and there will be no undesirable situations such as the assembly position is incorrect and the combined contour cannot be matched, or the positioning force is too large to cause damage to the screw tap. . The second assembly portion 22 is a polygonal concave hole recessed in the first assembly portion 21, and the second assembly portion 22 is for the second driving tool 62 to be inserted and combined by way of insertion Similarly, it has the advantages of quick and easy connection and clear connection position. In other words, the driving part 2 provides two opposite assembly methods (sleeve and plug) through the first assembly part 21 and the second assembly part 22, which can be more widely and immediately different from the existing Drive tool to connect.

It is worth mentioning that the design of the second connection part 22 can effectively break through the environmental limitation of tapping through plug-in driving; for example, when tapping the Mars plug hole of the engine mechanism, only use this The first group of joints 21 is used for tapping. The driving tool is often interfered by the structure of the engine or the surrounding components and often does not have enough room for action. As a result, the tapping depth of the Mars plug hole is insufficient to be surely combined with the Mars plug. At this time, the driving tool of the slender rod can be replaced with the second assembly part 22 for tapping. The reason is that the slender rod has a small volume, a small radial size, and a sufficient length Therefore, it can effectively extend into the narrow space to further drive the screw tap and tap the deeper hole.

Preferably, the distance between the hole wall 221 of the second assembly part 22 and the outer wall 211 of the first assembly part 21 is between 1.5 mm and 6 mm to ensure that the wall thickness of the driving part 2 has A certain structural strength can bear the force from the first and second driving tools 61, 62 and can be kept at a lighter weight.

In this embodiment, the outer contour of the first assembly portion 21 is hexagonal and can be widely sleeved by the sleeve structure, and the contour of the second assembly portion 22 is quadrangular in shape to be widely used by tools with D-heads Head plug. Moreover, at least one positioning hole 222 is recessed in the hole wall 221 of the second assembly portion 22, the at least one positioning hole 222 is used for inserting and setting a positioning member 622 of a driving head 621 of the second driving tool 62, In order to improve the tightness of the coupling between the second connecting portion 22 and the second driving tool 62. In addition, in the direction of the axis 4, the hole depth of the second assembly portion 22 preferably occupies at least half of the length of the driving portion 2 to provide sufficient depth to increase the hole wall 221 of the second assembly portion 22 Contact area with the driving head 621 of the second driving tool 62.

The tapping section 3 includes a tapered head 31 arranged along the axis 4 direction, a first tapping portion 32 and a second tapping portion 33, the first tapping portion 32 is interposed between the head Between the portion 31 and the second tapping portion 33, the head 31 is farthest from the driving portion 2, the outer diameter of the second tapping portion 33 is greater than the outer diameter of the first tapping portion 32, the first tapping The outer diameter of the tooth portion 32 is greater than the maximum outer diameter of the head 31, and the plurality of blade portions 36 are distributed in the first tapping portion 32 and the second tapping portion 33. Wherein, in the direction of the axis 4, the maximum distance between the second tapping portion 33 and the head 31 is more than three times the length of the driving portion 2 in order to provide a better tapping working length.

In more detail, when the head 31 is inserted into the hole, the screw tap can be guided to be coaxially arranged with the hole, thereby ensuring the correct position of the generated internal thread. The first tapping portion 32 is to initially cut and expand the wall surface of the hole, and the second tapping portion 33 is to drill the wall surface of the hole radially further to form an internal thread. That is to say, the second tapping portion 33 is a portion that actually taps the hole, so in the extending direction of the axis 4, the length of the second tapping portion 33 is preferably greater than that of the first tapping portion 32 The length is longer than the length of the head 31, so that the screw tap can be applied to holes of different depths.

In more detail, the tapping segment 3 further includes a plurality of first chip evacuation grooves 34, and each of the first chip evacuation grooves 34 is recessed in the tapping segment and extends along the head 31 toward the driving portion 2 3, and in the direction of the axis 4, each of the first chip-removing grooves 34 penetrates the head 31, and the chips generated during the tapping operation can be discharged through the first chip-removing grooves 34 to ensure the chipping The chips will not hinder the cutting of the plurality of edge portions 36, so that the processed internal thread can have better processing quality. Each of the first chip discharge grooves 34 forms a chip guide port 341 at the head 31. Viewed along the axis, the chip guide port 341 is eccentrically arc-shaped, and the arc profile of the chip guide port 341 is The bend does not point to the center of the head 31.

In this embodiment, the plurality of first chip evacuation grooves 34 is four, and the four first chip evacuation grooves 34 are arranged at equal angles, and the first chip evacuation is symmetrical. The minimum separation distance between the groove 34 and the head 31 is at least 5 mm, in order to have a more appropriate chip evacuation density. In addition, viewed along the axis 4, two center lines 312 are perpendicularly intersected with the center of the head 31, and each center line 312 passes through the two chip guide ports 341, wherein the center line 312 and the chip guide port pass through The minimum distance between the bends of the curved profile of 341 is 1mm.

Preferably, the head 31, the first tapping portion 32 and the second tapping portion 33 are arranged at intervals to form two second chip evacuation grooves 35, each of the second chip evacuation grooves 35 along the The tapping segment 3 extends circumferentially, and the first chip evacuation groove 34 communicates with the second chip evacuation groove 35 alternately. The second chip evacuation groove 35 provides the effect that the chips can move in the circumferential direction, so that the When the screw is tapped, the chips can be discharged more smoothly and quickly.

Preferably, the first tapping portion 32 is provided with a first inclined wall 321 facing the head 31, and the second tapping portion 33 is provided with a second inclined wall 331 facing the first tapping portion 32, through The first inclined wall 321 and the second inclined wall 331 can guide the movement of chips to ensure that the chips do not accumulate.

In this embodiment, the first inclined wall 321 and the axis 4 form a first angle 51, and the second inclined wall 331 and the axis 4 form a second angle 52, wherein the angle of the first angle 51 is greater than The angle of the second included angle 52. Similarly, a tapered wall 311 of the head 31 will form a third angle 53 with the axis 4. The angle of the third angle 53 is smaller than the second angle 52. Specifically, the first included angle 51 is between 40 degrees and 50 degrees, the second included angle 52 is between 25 degrees and 35 degrees, and the third included angle 53 is between 4 degrees and 14 degrees.

Here, another method for using a screw tap is provided, which includes the following steps: providing an object 7 that includes a perforation 71; providing the screw tap as mentioned above, some structural features have been explicitly stated above, in This is not repeated here. It should be emphasized that the tapping segment 3 includes the tapered head 31 and a body 37 (that is, the first tapping portion 32 and the second tapping portion 33 Part), the outer contour of the head 31 is a smooth surface, the body 37 is surrounded by the plurality of blades 36, it can be understood that the maximum outer diameter of the plurality of blades 36 is not less than the maximum of the head 31 The outer diameter facilitates tapping and cutting operations. Provide a driving tool (ie, the first driving tool 61 or the second driving tool 62 mentioned above).

Next, a first tapping step is performed, the part of the head 31 of the screw tap is inserted into the through hole 71, and the other part of the head 31 abuts against the edge of the hole of the through hole 71; a second tap is performed Step, selectively connect the driving tool to one of the first connecting portion 21 and the second connecting portion 22, and then the driving tool and the screw tap are in the same rotation relationship, and the structure of the connecting structure is configured And please refer to the above and do not repeat them here; Finally, a third tapping step is performed to drive the driving tool to drive the screw tap to rotate and force the screw tap into the object 7 along the perforation 71, wherein the head The portion 31 is used to expand the through hole 71, and the plurality of blade portions 36 is used to cut the hole wall of the through hole 71.

Preferably, the body 37 is further provided with at least one inclined wall (in this embodiment, the first inclined wall 321 and the second inclined wall 331), the maximum outer diameter of each inclined wall is larger than the head 31 In this way, when the third tapping step is performed, the head 31 is subjected to preliminary flaring, and the inclined wall is flared again to reduce the plurality of blades 36 during the tapping operation The resistance encountered during cutting, especially when the material hardness of the object 7 is high, this structural configuration allows the tapping operation to proceed smoothly, and the plurality of blade portions 36 are less likely to quickly wear or break.

In summary, the screw tap of the present invention and the method of using the same, the screw tap simultaneously provides two opposite assembly modes of the first group connection part and the second group connection part, which can be combined with different driving tools to increase the combination of driving tools And the tapping section is provided with a head to guide the position, the first tapping section is for preliminary drilling, and the second tapping section is for internal thread forming, and it can be reliably processed into the wall surface of the hole In addition, the tapping section is also provided with interlaced first and second chip evacuation grooves to guide the removal of chipping to ensure the processing quality of the internal thread.

1‧‧‧Body 2‧‧‧Drive part 21‧‧‧First group connecting part 211‧‧‧Outer wall 22‧‧‧Second group connecting part 221‧‧‧ Hole wall 222‧‧‧Locating hole 3‧‧‧ Tapping section 31‧‧‧ Head 311‧‧‧ Oblique cone wall 312‧‧‧ Centerline 32‧‧‧First tapping section 321‧‧‧First inclined wall 33‧‧‧Second tapping section 331‧ ‧‧Second inclined wall 34‧‧‧First chip removal groove 341‧‧‧Chip guide port 35‧‧‧Second chip removal groove 36‧‧‧Blade 37‧‧‧Body 4‧‧‧Axis 51‧‧‧First included angle 52‧‧‧Second included angle 53‧‧‧ Third included angle 61‧‧‧First drive tool 62‧‧‧Second drive tool 621‧‧‧Drive head 622‧‧‧Locator 7 ‧‧‧Object 71‧‧‧Perforation

FIG. 1 is a perspective view of an embodiment of the invention. Fig. 2 is a right side view of Fig. 1. Fig. 3 is a left side view of Fig. 1. 4 is a side cross-sectional view of FIG. 1. FIG. 5 and FIG. 6 are schematic diagrams of the use state of the first assembly part according to an embodiment of the invention. FIG. 7 and FIG. 8 are schematic diagrams of the usage state of the second assembly part according to an embodiment of the invention. 9 is a schematic diagram of another usage state of the second assembly part according to an embodiment of the invention.

1‧‧‧Body

2‧‧‧Drive Department

3‧‧‧Tapping section

34‧‧‧First chip removal groove

35‧‧‧second chip groove

36‧‧‧Blade

Claims (10)

A screw tap includes: a body including a driving part and a tapping segment connected, the driving part includes a first group connecting part and a second group connecting part, the first group connecting part is provided with a The first driving tool is assembled, the second assembly part is used for being assembled with a second driving tool, and a plurality of cutting edge parts are arranged on the tapping section. The screw tap according to claim 1, wherein the driving part and the tapping segment are coaxially arranged along an axis, and the tapping segment includes a tapered head and a first tapping arranged along the axis A tooth portion and a second tapping portion, the first tapping portion is between the head and the second tapping portion, the head is farthest from the driving portion, and the outer diameter of the second tapping portion is greater than The outer diameter of the first tapping portion, the outer diameter of the first tapping portion is greater than the maximum outer diameter of the head; the plurality of blade portions are distributed on the first tapping portion and the second tapping portion. The screw tap according to claim 2, wherein the tapping segment further includes a plurality of first chip evacuation grooves, each of the first chip evacuation grooves is recessed in the tapping tooth and extends along the head toward the driving portion In the direction of the axis, each of the first chip grooving grooves penetrates the head, and each of the first chip grooving grooves forms a chip guide opening at the head. Viewed along the axis, the chip guide opening It has an eccentric arc shape, and the curved part of the curved contour of the chip guide port does not point to the center of the head. The screw tap according to claim 2, wherein the head, the first tapping portion and the second tapping portion are arranged at intervals to form two second chip evacuation grooves, each of the second chip evacuation grooves Along the circumferential direction of the tapping section, the first chip grooving groove and the second chip grooving groove are alternately connected, and the first tapping portion is provided with a first inclined wall facing the head, the second tapping The tooth portion is provided with a second inclined wall facing the first tapping portion. The screw tap of claim 4, wherein the first inclined wall and the axis form a first angle, the second inclined wall and the axis form a second angle, and the angle of the first angle is greater than the second angle The angle. The screw tap according to any one of claims 1 to 5, wherein the first group of connecting parts is a polygonal projection, the first group of connecting parts is for the first driving tool to be sleeved and combined, the second The assembling part is a polygonal concave hole recessed in the first assembling part, and the second assembling part is for the second driving tool to be inserted and combined. The screw tap as claimed in claim 6, wherein the distance from the hole wall of the second group of connecting parts to the outer wall of the first group of connecting parts is between 1.5 mm and 6 mm. The screw tap according to claim 5, wherein in the extending direction of the axis, the length of the second tapping portion is greater than the length of the first tapping portion and greater than the length of the head; A plurality of first chip evacuation grooves are included, and each of the first chip evacuation grooves is recessed in the tapping section and extends along the head toward the driving part, and in the axis direction, each of the first chip evacuation grooves The groove passes through the head; each of the first chip discharge grooves forms a chip guide opening at the head, viewed along the axis, the chip guide opening is in an eccentric arc shape, and the curved profile of the chip guide opening is curved The point is not directed to the center of the head; the first group of connecting parts is a polygonal convex block, the first group of connecting parts is for the first driving tool to be sleeved together, and the second group of connecting parts is concave The polygonal concave hole of the first group connection part, the second group connection part is for the second driving tool to be inserted and combined; a hole wall of the second group connection part to an outer wall of the first group connection part The distance is between 1.5mm and 6mm; at least one positioning hole is recessed in a hole wall of the second assembly part, and the at least one positioning hole is used for inserting and setting a positioning member of a driving head of the second driving tool The outer diameter of the driving part is larger than the outer diameter of the tapping section; the outer contour of the first group of joints is hexagonal, the contour of the second group of joints is quadrangular; the oblique cone wall of the head and the The axis includes a third angle, the angle of the third angle is smaller than the second angle; the first angle is between 40 degrees and 50 degrees, the second angle is between 25 degrees and 35 degrees, the third The included angle is between 4 degrees and 14 degrees; the plurality of first chip evacuation grooves is four, and viewed along the axis, the four first chip evacuation grooves are arranged at equal angle intervals, and the two symmetrical first The minimum distance between the chip evacuation groove and the head is at least 5mm; viewed along the axis, the two center lines are vertically staggered to the center of the head, and each center line passes through the two chip guide ports, wherein the center The minimum distance between the line and the bend of the arc profile passing through the chip guide opening is 1mm; in the direction of the axis, the depth of the hole of the second set of joints occupies at least half of the length of the driving part; In the axial direction, the maximum distance from the second tapping portion to the head is more than 3 times the length of the driving portion. A method of using a screw tap includes the following steps: providing an object with a perforation; providing a screw tap, the screw tap includes a body, the body includes a driving portion arranged along an axis and connected A tapping segment, the driving part includes a first group connecting part and a second group connecting part, the tapping segment includes a tapered head and a body part, the outer contour of the head is a smooth surface, The body ring is provided with a plurality of blades, and the maximum outer diameter of the plurality of blades is not less than the maximum outer diameter of the head; providing a driving tool; a first tapping step, inserting the part of the head of the screw tap into the Perforation, and the other part of the head rests against the hole edge of the perforation; a second tapping step, the driving tool is selectively assembled in the first assembly part and the second assembly part One, and then the driving tool and the screw tap have the same rotation relationship; a third tapping step, driving the driving tool to drive the screw tap to rotate and forcing the screw tap into the object along the perforation, wherein the head The part is used to expand the perforation, and the plural edge parts are used to cut the hole wall of the perforation. The method of using screw taps according to claim 9, wherein the body is further provided with at least one inclined wall, and the maximum outer diameter of each inclined wall is greater than the maximum outer diameter of the head; before performing the third tapping In the step, the head is initially flared, and the inclined wall is flared again.

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