JP2018527191A - Pipe expansion punch - Google Patents

Abstract

The present invention relates to a pipe expansion punch, and more particularly to a pipe expansion punch for a drill that enables the pipe to be expanded by rotation or blow using an anchor drill or a charging drill. A pipe expansion punch according to an embodiment of the present invention includes a tube expansion mandrel in which one or more portions having an outer diameter larger than the inner diameter of a pipe to be expanded (hereinafter referred to as “expansion portion”) are formed, and the tube expansion mandrel And an outer diameter of the introduction portion at the end of the expanded mandrel is smaller than the inner diameter of the pipe. A tapered first stepped portion is formed between the introduction portion and the expanded portion, and the tapered first stepped portion is polished to form one or more planes. To do. [Selection] Figure 1

Description

  The present invention relates to a pipe expansion punch, and more particularly to a pipe expansion punch for a drill that enables the pipe to be expanded by rotation or blow using an anchor drill or a charging drill.

  In general, home appliances such as a refrigerator, an air conditioner, and a water purifier are provided with a refrigeration cycle for cooling.

  According to the refrigeration cycle of household appliances that are normally used, the compressor and the condenser are connected to the connecting pipe, the condenser and the evaporator are connected to the capillary tube through the refrigerant supply pipe, and the evaporator and the compressor are sucked. Connected to the pipe.

  Such a refrigeration cycle includes a compressor that compresses gaseous refrigerant at high temperature and high pressure, a condenser that condenses the high temperature and high pressure refrigerant gas discharged from the compressor, and a capillary tube through the condenser. The low-temperature and low-pressure liquid refrigerant that has passed through is composed of an evaporator that absorbs latent heat of evaporation and cools it.

  Such a refrigeration cycle is configured such that the refrigerant circulates again from the evaporator to the evaporator via the condenser and the capillary by driving the compressor.

  A connection pipe, a refrigerant supply pipe, a capillary tube, a suction pipe, and the like provided for such a refrigeration cycle are made of a copper pipe or the like, and in order to facilitate connection, the tip of the pipe is expanded to a predetermined diameter. One pipe is connected to another pipe by welding.

  In order to expand the pipe, it is necessary to insert a tube expansion mandrel of a hard material having an outer diameter larger than the inner diameter of the pipe inside the pipe to be expanded, and to simultaneously expand the inner diameter of the pipe and the outer diameter of the pipe. At this time, the expanded mandrel is used by being connected to a round bar called a rod bar.

  When pipes are expanded on-site using a conventional tube expansion mandrel, the rod bar is connected to the tube expansion mandrel while the pipe is fixed after the outer peripheral surface of the tube expansion mandrel is stepped according to the pipe size and inserted into the pipe. The tube was expanded from behind with a hammer.

  However, the conventional tube expansion mandrel has a round shape in cross section, and a large load is generated during the tube expansion operation, so that a lot of heat is generated, and the pipe expansion is not successfully performed.

  In addition, since a hammer or the like is grabbed by hand and manually hit, there is a problem that carrying a heavy hammer is not free, and a lot of effort is put into tube expansion work.

  The present invention has been made to solve the above-described problems, and an object thereof is to integrally form a tube expansion mandrel having an elliptical cross section and a holder that can be expanded by a drill. As a result, less heat is generated during pipe expansion work, and pipe expansion of the pipe is performed well. In addition, since pipe expansion is performed using a drill, less force is applied, and it is not necessary to carry a hammer. Is to provide.

In order to achieve the above object, the pipe expansion punch according to the embodiment of the present invention has at least one portion (hereinafter referred to as “expansion portion”) having an outer diameter larger than the inner diameter of the pipe to be expanded. An expanded mandrel
A holder formed integrally with the tube expansion mandrel, coupled and fixed to the drill, and capable of expanding the pipe using the drill;
The outer diameter of the introduction part at the end of the pipe expansion mandrel is formed smaller than the inner diameter of the pipe, and a tapered first step part is formed between the introduction part and the pipe expansion part,
The tapered first stepped portion is polished to form one or more planes.

  Moreover, the said pipe expansion part is made into the shape of a round cross-section ellipse whose radius is not the same.

  In addition, when two or more pipe expansion parts are provided, a tapered second step part is formed between the two pipe expansion parts, and the tapered second step part is polished to one or more planes. Is formed.

  In addition, a left screw portion or a right screw portion in which screw valleys and screw threads are alternately formed in the left screw direction or the right screw direction is formed on the outer peripheral surface of the tube expansion mandrel.

  The thread may have a rounded shape on the outside.

  The width of the thread may be wider than the width of the thread valley.

  In addition, when the introduction portion faces the left side and is a right screw portion, a screw valley is formed above a diagonal line passing through the first and second stepped portions having a relatively large radius from the upper left portion to the lower right portion. When the introduction portion is directed to the left side and is a left screw portion, a screw valley is formed below a diagonal line passing from the upper right portion to the lower left portion through the first and second stepped portions having a relatively large radius. It is characterized by being.

  Further, when the tube expansion mandrel is divided into four parts horizontally and vertically, a part of the quadrant on the front upper side of a narrow surface having a relatively large radius along the rotation direction of the tube expansion mandrel with respect to the vertical line as a plurality of tube expansions. It cuts out flatly over a part and the 1st, 2nd step part.

  The flat surface formed by the polishing may be formed in tapered first and second step portions having a narrow surface having a relatively large radius.

  In addition, the holder can be connected to the socket of the charging drill and is made of a hexagonal bar, or can be connected to the socket of the anchor drill, and the fitting groove corresponds to the outer peripheral surface of the round bar. The fixing groove is formed corresponding to the outer peripheral surface between the fitting grooves.

  According to the means for solving the problems described above, the tube expansion mandrel having an elliptical cross section and the holder that enables the tube expansion using a drill are integrally formed, so that heat can be generated during the tube expansion operation. It is generated in a small amount, and the pipe is expanded well. In addition, since the pipe is expanded using a drill, less force is applied, and it is not necessary to carry a hammer, so it is easy to use.

It is a perspective view of a pipe expansion punch concerning a 1st embodiment of the present invention. It is an illustration figure which shows the outer diameter of the tube expansion mandrel shown in FIG. It is a perspective view of the pipe expansion punch which concerns on 2nd Embodiment of this invention. It is an illustration figure which shows the outer diameter of the pipe expansion mandrel shown in FIG. It is an illustration figure which shows the outer diameter of the pipe expansion mandrel shown in FIG. It is a figure which shows the pipe expansion work using the pipe expansion punch shown in FIG. It is a front view of the tube expansion mandrel which concerns on 3rd Embodiment of this invention. It is a front view of the tube expansion mandrel which concerns on 3rd Embodiment of this invention. It is a front view of the tube expansion mandrel which concerns on 4th Embodiment of this invention. It is a front view of the tube expansion mandrel which concerns on 4th Embodiment of this invention. It is a front view of the tube expansion mandrel which concerns on 5th Embodiment of this invention. It is a front view of the tube expansion mandrel which concerns on 5th Embodiment of this invention. It is a side view of the tube expansion mandrel concerning the present invention.

  Hereinafter, the configuration and operation of an embodiment of the present invention will be described with reference to the accompanying drawings.

  1 is a perspective view of a pipe expansion punch according to a first embodiment of the present invention, and FIG. 2 is an exemplary view showing an outer diameter of the expansion mandrel shown in FIG. It is.

  As shown in FIG. 1, the tube expansion punch 10 according to the first embodiment of the present invention is formed by integrally forming a tube expansion mandrel 20 and a holder 30 with a hard material.

  The tube expansion mandrel 20 is formed with a tube expansion portion 22 having an outer diameter larger than the inner diameter of the pipe to be expanded, and the introduction portion 24 at the end of the tube expansion mandrel 20 is The outer diameter is smaller than the inner diameter of the pipe.

  Further, a tapered stepped portion 26 is formed between the expanded portion 22 and the introduction portion 24 in order to facilitate the expansion of the pipe.

  At this time, the tapered stepped portion 26 is polished to form one or more planes 120.

  On the other hand, the said pipe expansion part 22 makes the cross-sectional ellipse shape which consists of a round shape with the same radius.

  For example, as shown in FIG. 2, when the outer diameter of the expanded portion 22 is 16.7 mm, the radius R is not constant at 8.85, and the radii are 8.35, 8.85, and 9.6. Since it is different, it consists of a round circle whose radius is not constant.

  The holder 30 can be used by being fixedly coupled to a charging drill, and can be coupled to a socket of the charging drill, and includes a hexagonal bar.

  Although the pipe expansion mandrel 20 and the holder 30 are integrated into one, a stopper 40 having an outer diameter larger than the outer diameter of the pipe expansion part 22 is provided between the pipe expansion mandrel 20 and the holder 30, and the pipe Make sure that it is no longer expanded.

  On the other hand, the charging drill is mainly used for the purpose of drilling holes by rotation. In the present invention, the pipe is expanded by rotating or hitting the expansion punch 10 using an impact driver.

  FIG. 3 is a perspective view of a pipe expansion punch according to a second embodiment of the present invention, and FIGS. 4 and 5 are exemplary views showing the outer diameter of the tube expansion mandrel shown in FIG. 3 when an anchor drill is used. It is a pipe expansion punch figure.

  As shown in FIG. 3, the tube expansion punch 50 according to the second embodiment of the present invention is formed by integrally forming a tube expansion mandrel 60 and a holder 70 with a hard material.

  The tube expansion mandrel 60 has two tube expansion portions having an outer diameter larger than the inner diameter of the pipe to be expanded so that two pipes having different inner diameters can be expanded with one tube expansion punch 50 (first, 2 expanded pipe portions 61, 62), and a tapered stepped portion 64 is formed between the first expanded pipe portion 61 and the second expanded tube section 62 in order to facilitate the expansion of the pipe.

  In order to facilitate the insertion of the pipe, the introduction part 63 at the end of the tube expansion mandrel 60 is formed so that the outer diameter thereof is smaller than the inner diameter of the pipe, and between the second pack pipe 62 and the introduction part 63. However, a tapered step 65 is formed in order to facilitate pipe expansion.

  At this time, the said 1st pipe expansion part 61 and the 2nd pipe expansion part 62 make the cross-sectional ellipse shape which consists of a round shape whose radius is not constant.

  For example, as shown in FIG. 4, when the outer diameter of the second expanded portion 62 is 7 mm, the radius R is not constant at 3.5 and the radii are 3.43, 2.88, and 4.8. Since it is different, it consists of round shapes whose radii are not the same.

  Further, as shown in FIG. 5, when the outer diameter of the first pipe expanding portion 61 is 10.5 mm, the radius R is not constant as 5.25, and is 5.18, 4.63, 6.55, 5 Since the radii are different from each other at.

  The holder 70 can be used by being fixedly coupled to an anchor drill. The holder 70 can be coupled to a socket possessed by the anchor drill, and the fitting groove 72 corresponds to the outer peripheral surface of a circular round bar. The fixing groove 74 is formed correspondingly on the outer peripheral surface between the fitting grooves 72.

  At this time, the fitting groove 72 is formed from the end of the circular round bar to the middle, and the fixing groove 74 is formed midway of the circular round bar.

  The tube expansion mandrel 60 and the holder 70 are integrated into one, but the tube expansion mandrel 60 and the holder 70 have a larger outer diameter of the tube expansion mandrel, that is, the outer diameter of the first tube expansion portion 61. A stopper 80 having an even larger outer diameter is provided so that the pipe is no longer expanded.

  On the other hand, the anchor drill is used for a purpose of drilling a hole by striking or rotating, and expands a pipe.

  FIG. 6 is a view showing a pipe expansion work using the pipe expansion punch shown in FIG.

  As shown in FIG. 6, with the pipe P fixed so as not to move, the holder 70 portion of the tube expansion punch 50 is coupled and fixed to the anchor drill B, and the introduction portion 63 which is the end portion of the tube expansion mandrel 60 is placed inside the pipe. Try to face.

  Next, the pipe expanding portion 61 or 62 of the pipe expanding mandrel 60 having an outer diameter larger than the inner diameter of the pipe P is inserted into the pipe P through the pipe expanding punch 50 by the heading operation of the anchor drill B, thereby The inner diameter and outer diameter of P are expanded and expanded at the same time.

  7 and 8 are front views of the tube expansion mandrel according to the third embodiment of the present invention.

  As shown in FIG. 7, the tube expansion mandrel 100 having an elliptical cross section having a round shape with a constant radius is intended to expand so that two pipes having different inner diameters can be expanded with one tube expansion punch. Two pipe expansion parts (first and second pipe expansion parts 101 and 102) having an outer diameter larger than the inner diameter of the pipe to be formed are formed, and pipe expansion of the pipe is performed between the first pipe expansion part 101 and the second pipe expansion part 102. A tapered step 104 is formed for ease.

  Further, in order to facilitate the insertion of the pipe, the introduction portion 103 at the end of the tube expansion mandrel 100 is formed so that the outer diameter thereof is smaller than the inner diameter of the pipe, and between the second tube expansion portion 102 and the introduction portion 103. However, a tapered step 105 is formed in order to facilitate pipe expansion.

  On the outer peripheral surface of the tube expansion mandrel 100 configured as described above, a right screw portion 110 in which screw valleys 111 and screw threads 112 are alternately formed in the right screw direction is formed. The thread 112 is rounded to the outside so as not to occur.

  In addition, among the tapered stepped portions 104 and 105, a narrow surface having a relatively large radius is polished so that the tube is smoothly expanded, and the flat surface 120 is formed by polishing in an approximately isosceles trapezoidal shape. One or more are formed.

  The right thread portion 110 reduces the friction of the pipe by reducing the frictional heat inside the pipe while reducing the friction by reducing the contact area with the pipe and reducing the friction, thereby reducing the distortion of the pipe. The crest 112 can reduce the breakage of the pipe and reduce the generation of foreign matter.

  As shown in FIG. 8, the tube expansion mandrel 100 having an elliptical cross section having a round shape with a constant radius is intended to expand so that two pipes having different inner diameters can be expanded with one tube expansion punch. Two pipe expansion parts (first and second pipe expansion parts 101 and 102) having an outer diameter larger than the inner diameter of the pipe to be formed are formed, and between the first pipe expansion part 101 and the second pipe expansion part 102, pipe expansion of the pipe In order to facilitate this, a tapered step 104 is formed.

  Further, in order to facilitate the insertion of the pipe, the introduction portion 103 at the end of the tube expansion mandrel 100 is formed so that the outer diameter thereof is smaller than the inner diameter of the pipe, and between the second tube expansion portion 102 and the introduction portion 103. However, a tapered step 105 is formed in order to facilitate pipe expansion.

  On the outer peripheral surface of the tube expansion mandrel 100 configured in this way, a left screw portion 130 in which screw valleys 131 and screw threads 132 are alternately formed in the left screw direction is formed. The thread 132 has a rounded outer shape so as not to occur.

  In addition, among the tapered stepped portions 104 and 105, a narrow surface having a relatively large radius is polished so that the tube is smoothly expanded, and the flat surface 120 is formed by polishing in an approximately isosceles trapezoidal shape. One or more are provided.

  The left screw portion 130 reduces the friction of the pipe by reducing the frictional heat inside the pipe while reducing the friction by reducing the contact area with the pipe to reduce the friction, and reducing the distortion of the pipe. The crest 132 can reduce the breakage of the pipe and reduce the generation of foreign matter.

  The right thread portion 110 is advantageous when expanding a pipe having a small inner diameter and a small thickness, and the left thread portion 130 is advantageous when expanding a pipe having a large inner diameter.

  9 and 10 are front views of a tube expansion mandrel according to a fourth embodiment of the present invention. FIG. 9 shows a wide surface with a relatively small radius of the tube expansion mandrel having an elliptical cross section, and FIG. A relatively large and narrow surface is shown.

  In FIG. 7, the width of the thread valley 111 of the right thread portion 110 is formed wider than the width of the thread 112, but in FIGS. 9 and 10 of the fourth embodiment, the width of the thread valley 111 of the right thread portion 110 is It is formed narrower than the width of the thread 112.

  Further, the tapered stepped portions 104 and 105 on a wide surface having a relatively small radius in FIG. 9 are polished into a round plane (shown by a broken line) so that the tube expansion is performed smoothly, and are formed into a substantially isosceles trapezoidal shape. One or more flat surfaces 120 are formed by polishing.

  In this case, a round flat surface is first processed so that a flat surface 120 is formed in the stepped portions 104 and 105, and after the thread valley 111 is processed, the left and right sides of the thread valley 111 are chamfered.

  Thereby, sludge can be prevented and generation of heat can be reduced.

  Further, as shown in FIG. 10, the position of the screw valley 111 on the narrow surface having a relatively large radius greatly affects the ease of the tube expansion. Therefore, when the introduction portion 103 faces the left side, the stepped portions 104 and 105 are placed on the upper left side. While forming the thread valley 111 in the upward direction (right direction of ab and cd in the figure) on the side passing through the diagonal line (ab, cd) from the right to the lower right, the hatched portion rotates. It should be a driving force that facilitates tube expansion.

  11 and 12 are front views of a tube expansion mandrel according to a fifth embodiment of the present invention. FIG. 11 shows a wide surface with a relatively small radius of the tube expansion mandrel having an elliptical cross section, and FIG. A relatively large and narrow surface is shown.

  In FIG. 8, the width of the thread valley 131 of the left screw portion 130 is formed wider than the width of the screw thread 132. However, in FIGS. 11 and 12 of the fifth embodiment, the width of the screw valley 131 of the left screw portion 130 is the same. It is formed narrower than the width of the screw thread 132.

  In addition, the tapered stepped portions 104 and 105 on a wide surface having a relatively small radius in FIG. 11 are polished into a round plane (shown by a broken line) so that the tube expansion is performed smoothly, and have a substantially isosceles trapezoidal shape. One or more flat surfaces 120 are formed by polishing.

  In this case, the stepped portions 104 and 105 are first processed into a round flat surface so that a polished flat surface 120 is formed, the thread valley 131 is processed, and then the thread valley 131 is chamfered to the left and right.

  Thereby, sludge can be prevented and generation of heat can be reduced.

  In addition, as shown in FIG. 12, the position of the screw valley 131 on the narrow surface having a relatively large radius greatly affects the ease of tube expansion. A thread valley 131 is formed in a downward direction (left direction of ab and cd in the figure) on the side passing through a diagonal line (ab, cd) from the upper right part to the lower left part, and the hatched part is rotated. However, it should be the driving force that facilitates tube expansion.

  FIG. 13 is a side view of a tube expansion mandrel according to the present invention.

  When the expanded mandrel is divided into four parts horizontally and vertically from the expanded mandrel 100 having an elliptical cross section having a round shape with a non-constant radius, the front side in the rotational direction of a narrow surface having a relatively large radius with respect to the vertical line Cut out part of the upper quadrant.

  That is, as shown in FIG. 13, when the tube expansion mandrel 100 rotates counterclockwise, a portion of the quadrant in the direction of about 10 o'clock to 12 o'clock is cut flat, and on the contrary, it rotates clockwise. For example, a portion of the first quadrant from about 12 o'clock to 2 o'clock is cut flat.

  This cutting is performed at the portions of the first and second expanded pipe portions 101 and 102 and the tapered step portions 104 and 105 except the introduction portion 103 in FIGS. 9, 10, 11, and 12.

  Thereby, pipe expansion of the pipe can be facilitated by a driving force by rotation even with a small force of the drill and a small number of rotations, and heat generation can be reduced.

Claims (10)

A tube expansion mandrel formed with one or more portions having an outer diameter larger than the inner diameter of the pipe to be expanded (hereinafter referred to as “expanded portion”);
A holder formed integrally with the tube expansion mandrel, coupled and fixed to the drill, and capable of expanding the pipe using the drill;
The outer diameter of the introduction part at the end of the pipe expansion mandrel is formed smaller than the inner diameter of the pipe, and a tapered first step part is formed between the introduction part and the pipe expansion part,
The pipe expanding punch, wherein the tapered first step portion is polished to form one or more planes.   2. The pipe expansion punch according to claim 1, wherein the pipe expansion portion has a round cross-sectional elliptical shape with different radii. 3.   When two or more pipe expansion parts are provided, a tapered second step part is formed between the two pipe expansion parts, and the tapered second step part is polished to form one or more planes. The pipe expansion punch according to claim 1, wherein the pipe expansion punch is used.   The left screw portion or the right screw portion in which screw valleys and screw threads are alternately formed in a left screw direction or a right screw direction is formed on an outer peripheral surface of the tube expansion mandrel. Pipe expansion punch.   5. The pipe expansion punch according to claim 4, wherein the thread has a rounded outer shape.   The pipe expansion punch according to claim 4, wherein a width of the screw thread is formed wider than a width of the screw valley.   When the introduction portion faces the left side and is a right-hand thread portion, a thread valley is formed in the upward direction of a diagonal line passing from the upper left portion to the lower right portion through the first and second stepped portions of a narrow surface having a relatively large radius. In the case where the introduction portion faces the left side and is a left screw portion, a screw valley is formed in a downward direction of a diagonal line passing from the upper right portion to the lower left portion through the first and second step portions having a relatively large radius and a narrow surface. The pipe expansion punch according to claim 4, wherein the pipe expansion punch is provided.   When the tube expansion mandrel is divided into four parts horizontally and vertically, a part of the upper quadrant of a narrow surface having a relatively large radius along the rotation direction of the tube expansion mandrel with respect to the vertical line as a plurality of tube expansion parts. The pipe expansion punch according to claim 3, wherein the pipe expansion punch is cut flat over the first and second stepped portions.   4. The pipe expansion punch according to claim 3, wherein the flat surface formed by the polishing is formed in tapered first and second stepped portions of a narrow surface having a relatively large radius. The holder has a shape that can be coupled to a socket of a charging drill and is made of a hexagonal rod, or
It is a shape that can be coupled to a socket of an anchor drill, and a fitting groove is formed corresponding to the outer peripheral surface of the round bar, and a fixing groove is formed corresponding to the outer peripheral surface between the fitting grooves. The pipe expansion punch according to claim 1.

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