JP2013043265A - Pipe taper tap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To supply a pipe taper tap with which a tapered female screw thread having suitable depth can be threaded without using a thread gauge although the threading work to the suitable depth is hardly visualized by means of the conventional pipe taper tap and work efficiency becomes worse since the threading work is done while confirming the depth with the thread gauge.SOLUTION: The diameter of a shank part of the pipe taper tap is made larger than that of an edge-shaped part thereof. As a result, when the shank part is contacted with a workpiece, the advance of the pipe taper tap can be stopped or interrupted, so that the tapered female screw thread having suitable depth can be threaded with the pipe taper tap.

Description

  The present invention relates to a tap for machining a tapered female screw.

  A tap for machining a female thread on a workpiece is known. Regarding these taps, there is one disclosed in Patent Document 1.

  Patent Document 1 discloses the improvement of tapping processing, the improvement of the durability of small-diameter taps, etc., especially for small-diameter taps.

JP 2006-175533 A

  By the way, in the manufacture of an injection molded product, a stop plug may be used in a temperature control circuit for cooling a mold to be used, for example, in order to plug a flow path for flowing cold water.

  In this stopper plug, a taper female screw is machined on a circuit end face using a taper tap for pipe, and a taper screw plug is tightened on the taper female thread to form a stopper plug. FIG. 4 shows a stopcock of the temperature control circuit. Three trapezoids having the circuit end face as the bottom are shown, and a stopper plug is provided on the trapezoidal portion.

  However, when the depth of the taper female screw is shallow, the taper screw plug as the stopper plug protrudes from the end surface, and when it is deep, problems such as blocking the cooling circuit with the taper screw plug as the stopper plug occur.

  This state is shown in FIGS.

  In FIG. 5, since the depth of the taper female screw is deep, the taper screw plug that is a stopper plug enters deeper than the circuit end face of the temperature control circuit.

  On the other hand, in FIG. 6, since the depth of the taper female screw is shallow, the taper screw plug that is a stopper plug protrudes from the end face of the circuit.

  In FIG. 5 and FIG. 6, “b” is a direct system and an outer diameter of the upper surface of the taper screw plug that is a stopper plug, and an opening is processed in the circuit end surface so as to have a diameter of the dimension of “b”. And good.

  This state is illustrated in FIG. When the dimension at the circuit end face that is the bottom base of the three trapezoids in FIG. 4 is “b” and a taper screw plug that is a stop plug is provided, as shown in FIG. As shown in FIG. 6, it does not jump out.

  As shown in Fig. 6, the taper female thread must be machined to a suitable depth so that the above-mentioned problems do not occur. However, since it is difficult to judge visually, machining is performed while measuring the taper female thread depth with a screw gauge. Workability may be poor.

  The processing depth of these taper female threads is not disclosed in the above-mentioned Patent Document 1.

  As described above, in the conventional taper tap for pipes, it is difficult to visually determine the processing to a suitable depth, and when the processing is performed while checking the depth using a screw gauge, it cannot be said that the workability is good. It is.

  Therefore, the present invention is to provide a taper tap for a pipe that enables processing of a taper female screw having a suitable depth with respect to a stopper plug without using a screw gauge or the like.

  In the present invention, in order to achieve the above object, by making the shank diameter thicker than the blade shape diameter of the taper tap for pipe, the shank part becomes a stopper, so that processing is performed until the shank part comes into contact with the workpiece. A tapered female screw having a depth suitable for a stopper plug can be processed.

  Here, the configuration of the present invention will be described below in still other expressions.

  In a pipe taper tap in which a blade shape portion and a shank portion for cutting a female screw on a workpiece are integrally provided in an axial direction, an intermediate shaft portion is provided between the blade shape portion and the shank portion, and the blade The diameter of the shank part is made larger than the diameter of the shape and the diameter of the intermediate shaft part.

  Further, since the axial surface on the blade-shaped portion side of the shank portion is in contact with the opening end surface of the workpiece, the cutting of the female tap of the taper tap for pipe is stopped, and the opening processed into the workpiece The diameter of the part is set to a size corresponding to the stopped position.

  Further, since the axial surface of the shank portion on the blade-shaped portion side is in contact with the opening end surface of the workpiece, the cutting of the female tap of the taper tap for pipe is stopped, and the depth to be processed into the workpiece is stopped. To a depth corresponding to the stopped position.

  Further, the diameter dimension of the opening end face of the opening obtained by processing a female thread on the workpiece by the taper tap for pipe is used as a reference diameter, and the blade-shaped part from the reference diameter position, which is the position serving as the reference diameter, The space up to the shank is the intermediate shaft.

  Further, the axial dimension of the intermediate shaft portion is set to 1.5 mm to 2 mm.

  In addition, a tubular adjustment part having an axial dimension of the intermediate shaft part of 1.5 mm to 2 mm or more and an inner diameter of the outer diameter of the intermediate shaft part is provided in the intermediate shaft part, and the inner diameter of the adjustment part is The position of the adjusting part is fixed by the shank part by making it smaller than the outer diameter of the shank part.

  Further, the cutting of the female tap of the taper tap for pipe is stopped when the axial surface on the blade-shaped portion side of the adjusting portion is in contact with the opening end surface of the workpiece, thereby processing the workpiece. The diameter of the opening to be formed is set to a size corresponding to the stopped position.

  Further, the cutting of the female tap of the taper tap for pipe is stopped when the axial surface on the blade-shaped portion side of the adjusting portion is in contact with the opening end surface of the workpiece, thereby processing the workpiece. The depth to be made is a depth corresponding to the stopped position.

  Moreover, the diameter of the opening processed into the workpiece is changed by replacing the adjustment unit with the axial dimension of the adjustment unit changed.

  Further, the depth of the workpiece to be processed is changed by replacing the adjustment portion with the axial dimension of the adjustment portion changed.

  As described above, according to the present invention, it is possible to easily process a tapered female screw having a depth suitable for a stopper plug.

  Further, since the shank portion may be processed until it comes into contact with the workpiece, for example, it is not necessary to perform processing while measuring using a screw gauge, and workability is improved as compared with the conventional case.

It is a taper tap for pipes of the 1st example of the present invention. It is a figure explaining the taper tap for pipes of the 2nd example of the present invention. It is a figure explaining the taper tap for pipes of the 2nd example of the present invention. It is a figure explaining the flow path of a temperature control circuit, and the shape of a stopcock It is a figure which illustrates that the female screw for a stopcock was deeply processed It is a figure which illustrates that the female screw for a stopcock was processed shallowly It is a conventional taper tap for pipes

  Embodiments of the present invention will be described with reference to the drawings.

  FIG. 7 shows a conventional taper tap for a pipe.

  In the taper tap for pipe of FIG. 7, the blade shape portion 1 and the shank portion 2 are integrally provided in the axial direction, and the outer diameter of the shank portion 2 is larger than the blade shape diameter 3 that is the outer diameter of the blade shape portion 1. A certain shank diameter 4 is smaller.

  Note that “b” referred to in FIGS. 5 and 6 is a required diameter of the opening processed in the circuit end face, which is called a reference diameter, and is the reference diameter 5 in FIG. To do.

  Further, the position where the blade-shaped portion becomes the reference diameter is the reference diameter position 6 in FIG.

  7 has a shank diameter 4 smaller than the blade shape diameter 3, and the blade shape is processed from the reference diameter position 6 ahead. Also, the reference diameter position 6 cannot be determined visually.

  Therefore, when machining a tapered female thread, workability may be poor because the machining is performed while measuring the depth with a screw gauge.

  Further, since there is no stopper and there is the blade-shaped portion 1 ahead of the reference diameter position 6, there is a possibility of deep machining.

  That is, in the case of the pipe taper tap of FIG. 7, even if the reference diameter position 6 reaches the position of the circuit end face, the taper female screw is further processed. As shown in FIG. It may penetrate deeper than the position of the end face.

  Next, FIG. 1 shows a taper tap for a pipe which is an embodiment according to the present invention.

  The shank diameter 4 is larger than the blade shape diameter 3.

  By doing in this way, it can suppress that the shank part 2 contacts the end surface of a to-be-processed object, and processes a taper female screw deeply any more.

  As a result, as shown in FIG. 4, the diameter of the opening processed into the end surface of the workpiece by the processing becomes the above “b” or the reference diameter 5.

  Further, the intermediate shaft portion 7 may be provided from the reference diameter position to the shank 2.

  By setting the length of the intermediate shaft portion 7 to, for example, 1.5 mm to 2 mm, a tapered female screw having a depth suitable for the stopper plug can be processed.

  The shape of the working part of the machine tool to which the taper tap for pipe of FIG. 1 is attached, the characteristics of the working part, the support structure of the work piece in the machine tool, the state of support, or the material and hardness of the work piece For example, the length of the intermediate shaft portion 7 may be appropriately selected and adjusted.

  Next, another embodiment of the present invention will be described with reference to FIGS.

  In FIG. 2, the adjustment part 20 is provided in the intermediate shaft part 6 of FIG.

  The adjusting portion 20 has a tubular shape having an outer diameter of the intermediate shaft portion 6 in FIG. 1 as an inner diameter, and is fitted on the outer side with the intermediate shaft portion 6 as a concentric shaft.

  However, since the inner diameter of the adjusting portion 20 is smaller than the outer shank diameter 4 of the shank portion 2, the movement is stopped by the shank portion 2 even if the adjusting portion 20 is moved in the axial direction. , Blocked and fixed.

  Accordingly, the position of the adjustment unit 20 is defined and fixed by the shank unit 2. At this time, since the axial surface on the blade-shaped portion 1 side of the adjusting portion 20 is in contact with the opening end surface of the workpiece, the contact taps and interferes, so that the progress of the taper tap for pipe during processing is stopped and prevented. It is no longer necessary to machine the internal thread deeper in the workpiece.

  In FIG. 2, the distance, dimension, and length from the position (reference diameter position 6 in FIG. 1) that is the reference diameter to the end face of the shank portion 2 are represented by the sum of “Z1 + T1”.

  When the adjusting portion 20 is not fitted in the intermediate shaft portion 7, the blade-shaped portion 1 proceeds while processing the female screw, and does not stop even after the reference diameter position 6. Further, “Z1 + T1” It will stop at the advanced position by the length of the sum.

  For this reason, the internal thread is processed in the workpiece to a position deeper by the sum of “Z1 + T1” than the position of the reference diameter 5 or “b”.

  Here, when the adjusting portion 20 having an axial length and dimension of “T1” is provided in the intermediate portion 7, the blade-shaped portion 1 advances while processing the internal thread, and advances by the length of “Z1”. When the end surface of the adjustment portion 20 on the blade-shaped portion 1 side comes into contact with and interferes with the opening end surface of the workpiece, the progress of the taper tap for pipe during processing is stopped and prevented.

  As a result, the taper tap for pipe stops at a shallow position by the length and dimension of “T1” of the adjustment unit 20.

  Therefore, by changing the “T1”, the length and dimension of “Z1” can be set to desired values and desired values.

  FIG. 3 shows an embodiment in which the adjusting unit 20 is set to a value “T2” smaller than “T1” so as to have a value “Z2” larger than “Z1”.

  In this Example 2, even in the same pipe taper tap, by changing the axial length and dimensions of the adjusting portion 20 provided in the intermediate shaft portion 7, the depth in the processing of the female screw provided in the workpiece can be changed. The depth can be changed to a desired depth and a desired depth.

  Alternatively, in the embodiment, even if the pipe tap tap is the same, by changing the axial length and dimensions of the adjusting portion 20 provided in the intermediate shaft portion 7, the workpiece can be processed by processing the female screw provided in the workpiece. It is possible to change the diameter of the opening provided in the end face of the slab so as to have a desired size and a desired size.

  In addition, the said Example etc. are demonstrated in carrying out about this invention.

  Therefore, the present invention is not limited to the above description, but is allowed to be changed as appropriate.

  For example, in FIGS. 1, 2, and 3 of the embodiment of the present invention, the outer locus of the tap gradually becomes thicker from the tip of the pipe taper tap toward the shank portion 2.

  The cross section of this portion becomes an inclined cross section as it approaches the shank portion 2 from the tip of the pipe taper tap, and a generally called taper is provided.

  However, the state in which this taper is provided does not continue to increase until it approaches the shank portion 2. For example, the value of “b”, or the reference diameter position 6 after the reference diameter 5 becomes the thickness of the tap portion. A state in which the shank portion 2 reaches the shank portion 2 with the same thickness without being thickened may be used.

  In this case, the cross section of the tap portion has a tapered shape that is inclined to the reference diameter position 6 that becomes the reference diameter 5, but the thickness does not change after the reference diameter position 6 that becomes the reference diameter 5, and in a parallel state. It may be a straight state.

  Further, after the reference diameter position 6 which becomes the reference diameter 5, the thickness may be reversed, but the taper may be slightly narrowed.

  Alternatively, after the reference diameter position 6 that becomes the reference diameter 5, the blade-shaped portion may not be provided.

  By changing the thickness of these tap parts, the diameter of the opening made in the work piece is larger than the desired value, a predetermined value, and it is possible to aim at the effect of making it possible to avoid becoming thicker It is.

  Alternatively, it is possible to reduce resistance, friction resistance, and the like with respect to a work surface portion to which a main pipe taper tap comes into contact when a female screw of a hole serving as an opening portion having a reference diameter 5 is deeply provided in a workpiece.

  In addition, although “below the reference diameter position 6 that becomes the reference diameter 5” has been described above, it is not necessarily limited to “after the reference diameter position 6 that becomes the reference diameter 5”. Depending on the state and characteristics of the machine, it may be appropriately moved back and forth in the axial direction with respect to the “reference diameter position 6 as the reference diameter 5”.

  As described above, in carrying out the present invention, if it corresponds to the idea of the present invention described above, it is conceived based on the description of the above-described embodiments and the description of these embodiments. Even if various forms and devices are made, it can be said that the invention relates to the present invention.

1 ... Blade shape part, 2 ... Shank part, 3 ... Blade shape diameter, 4 ... Shank diameter 5 ... Reference diameter, 6 ... Reference diameter position, 7 ... Intermediate shaft part

Claims (10)

In a taper tap for a pipe in which a blade shape portion and a shank portion for cutting a female thread on a workpiece are integrally provided in the axial direction,
An intermediate shaft portion is provided between the blade shape portion and the shank portion,
A taper tap for a pipe, wherein the diameter of the shank portion is larger than the diameter of the blade shape and the diameter of the intermediate shaft portion. In the taper tap for pipes according to claim 1,
The axial surface on the blade-shaped part side of the shank part is in contact with the opening end face of the workpiece, so that the cutting of the female tap of the taper tap for pipe is stopped, and the opening of the opening to be processed into the workpiece is stopped. A taper tap for pipes, wherein the diameter is a size corresponding to the stopped position. In the taper tap for pipes according to claim 1,
The axial surface on the blade-shaped portion side of the shank portion is in contact with the opening end surface of the workpiece, so that the cutting of the female tap of the taper tap for pipes is stopped, and the depth processed into the workpiece is reduced. A taper tap for pipes having a depth corresponding to the stopped position. In the taper tap for pipes according to claim 1,
The diameter dimension of the opening end face of the opening obtained by processing a female thread on the workpiece by the taper tap for pipe is a reference diameter,
A taper tap for pipes characterized in that a portion from the reference diameter position where the blade-shaped part becomes the reference diameter to the shank part is the intermediate shaft part. In the taper tap for pipes according to claim 1,
A pipe taper tap characterized in that the axial dimension of the intermediate shaft portion is 1.5 mm to 2 mm. In the taper tap for pipes according to claim 1,
The axial dimension of the intermediate shaft portion is 1.5 mm to 2 mm or more,
A tubular adjustment portion having an outer diameter of the intermediate shaft portion as an inner diameter is provided in the intermediate shaft portion,
A taper tap for a pipe, wherein an inner diameter of the adjusting portion is made smaller than an outer diameter of the shank portion, and a position of the adjusting portion is fixed by the shank portion. In the taper tap for pipes according to claim 6,
The axial surface on the blade-shaped portion side of the adjusting portion is in contact with the opening end surface of the workpiece, and the cutting of the female thread of the taper tap for pipe is stopped, so that the workpiece is processed. A pipe taper tap, characterized in that the diameter of the opening has a size corresponding to the stopped position. In the taper tap for pipes according to claim 6,
The axial surface on the blade-shaped portion side of the adjusting portion is in contact with the opening end surface of the workpiece, and the cutting of the female thread of the taper tap for pipe is stopped, so that the workpiece is processed. A taper tap for pipe, wherein the depth is a depth corresponding to the stopped position. In the taper tap for pipes according to claim 6,
A taper tap for a pipe, characterized in that the diameter of an opening to be processed into a workpiece is changed by replacing the adjustment portion with the axial dimension of the adjustment portion changed. In the taper tap for pipes according to claim 6,
A taper tap for a pipe, characterized in that the depth to be processed into a workpiece is changed by replacing the adjustment portion with the axial dimension of the adjustment portion changed.

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