A copper pipe reamer tool

Abstract

The application discloses a copper pipe reamer tool, which comprises a reamer cone and a de-coning structure of the reamer cone, the reamer cone is fixedly connected with a handle and the rotation axis of the reamer cone is perpendicular to the length direction of the handle, and the reamer cone is arranged at the central position of the length direction of the handle; the reamer tool further comprises a reamer sleeve pad which is arranged in cooperation with the reamer cone, the end of the reamer sleeve pad away from the reamer cone is fixedly connected or integrally connected with a bottom plate; and the reamer sleeve pad is matched with a copper pipe to be reamed. The copper pipe is reamed twice by the two reamer cones with different tapers, which is beneficial to metal flow and effectively improves the cracking problem of the upper end of the pipe blank caused by reaming. The application can avoid the situation that the inner wall of the red copper pipe generates more heat when the reamer cone is used for reaming, can reduce thermal stress and is beneficial to the separation of the reamer cone. The application can meet the production requirements, is simple to manufacture, convenient to use and low in manufacturing cost.

Description

TECHNICAL FIELD

[0001] The application relates to a copper pipe reamer tool. BACKGROUND

[0002] The valve disc connecting pipe of the ice room of an 82000-ton bulk cargo ship of Tongli (Singapore) Shipping Group is a φ20 red copper pipe, and the connecting part needs to be expanded into a flared opening. The existing purchased tool can only expand a φ19 red copper pipe at most, the on-site construction period is tight, and it is impossible to purchase a tool in time, so the tool needs to be self-made to expand the hole to ensure the production period.

[0003] In the paper “Research on shape of shearing ring for hot expansion of stainless steel pipe blank” published by Cheng Yiming in Die & Mould Manufacturing, No. 10, 2019, a research method combining finite element simulation and actual production test is used to study the hot expansion deformation process of the 60MN hot extrusion production line, and the focus is on whether the shearing ring in the hot expansion process can smoothly shear off the excess material after expansion. Three different shapes of shearing rings are designed and the hot expansion process is simulated and analyzed. Through the analysis and research of the relationship between the expansion of the remaining material and the gap area of the shearing ring, it is concluded that the remaining material after expansion is prone to die in the outlet area of the shearing ring, which is not conducive to the separation of the expansion cone and the excess material. Although it is a study on the expansion of stainless steel pipes and a hot expansion study of stainless steel pipes, the expansion cone and the red copper pipe are often difficult to separate during the expansion process of the valve disc connecting pipe (i.e. red copper pipe) of the ice room of the bulk cargo ship.

[0004] Patent No. CN208495970U: A finished red copper pipe reamer, comprising a bench drill body and a base plate, one surface of the base plate is provided with a fixed plate; the bench drill body is installed on the base plate through the fixed plate; the other side of one surface of the base plate is fixed with a base; the base comprises a bottom plate, one side of one surface of the bottom plate is provided with a clamping seat, and two sides of one end of the bottom plate are symmetrically provided with a baffle; a linear driving device is installed in the two baffles; the clamping seat is a “U” shaped plate structure; a slot is formed in one side of the clamping seat and one side of the bottom plate; a first sliding block is movably connected to one side of the clamping seat; and a second sliding block is movably connected to the other side of the clamping seat. It can clamp the red copper pipe and perform various expansion operations on the end hole of the red copper pipe at the same time, solving the problem of single expansion shape of the existing expansion device. However, the problem of how to separate the expansion cone and the expanded pipe has not been solved. SUMMARY

[0005] The purpose of the present application is to overcome the defects in the prior art, and to provide a copper pipe reamer tool that can meet the production requirements, is simple to make, easy to use and low in production cost.

[0006] To achieve the above object, the technical scheme of the present application is to design a copper pipe reamer tool, which comprises a reamer cone and a de-coning structure of the reamer cone, the reamer cone is fixedly connected with a handle and the rotation axis of the reamer cone is perpendicular to the length direction of the handle, and the reamer cone is arranged at the center position of the length direction of the handle.

[0007] The reamer tool further comprises a reamer cylinder pad arranged in cooperation with the reamer cone, and a bottom plate is fixedly connected or integrally connected to the end of the reamer cylinder pad away from the reamer cone; the reamer cylinder pad is matched with the copper pipe to be reamed. By using the tool, the production requirements can be met, the tool is simple to manufacture, convenient to use and low in manufacturing cost.

[0008] Further technical scheme is that the reamer cone is a pointed bolt;

[0009] or the reamer cone comprises a cone and a cylindrical rod integrally formed with the cone, and the cylindrical rod is fixedly connected with the handle. The reamer cone in the form of a pointed bolt can directly utilize the existing workpiece on the spot of the workshop, which is convenient for preparation and saves cost. In addition, the reamer cylinder pad in the form of a screw rod seat matched with the pointed bolt on the spot of the workshop can ensure the orientation of the reamer cone during reaming through the matching relationship between the threads on the outer wall of the pointed bolt and the internal threads on the inner wall of the screw rod seat, so as to ensure that the reamed hole is not skewed. The reamer cone in the form of a cone and a cylindrical rod integrally formed with the cone is customized according to the reaming condition.

[0010] Further technical scheme is that the reamer cone and the handle are fixedly connected to form an integral reaming structure, and the reaming structure is provided with two, one of which is a pointed bolt or a cone with a taper of 15°-20°, and the other is a pointed bolt or a cone with a taper of 25°-35°. The two reamer cones with different tapers are used for reaming twice, which is beneficial to metal flow. The taper of the second reamer cone is 25-35° and the taper of the first reamer cone is 15-20°, which effectively improves the cracking problem of the upper end of the pipe blank caused by reaming (due to the different metal flow and displacement characteristics of the reamer cone and the horn mouth of the pipe to be reamed under different matching, the small-angle reaming is adopted first, and then the large reaming angle required finally is adopted, a more reasonable matching is formed between the reamer cone and the horn mouth of the pipe to be reamed, which is more beneficial to the metal flow during reaming deformation, and effectively improves the cracking problem of the upper end of the pipe blank caused by reaming).

[0011] Further technical scheme is that the de-coning structure comprises a ball rotatably arranged on the outer wall of the cone body part of the reamer cone. The cone body part of the reamer cone is the end part of the pointed bolt or the cone part integrally formed with the cylindrical rod. The ball is rotatably arranged on the outer wall of the cone body part, and the sliding friction between the reamer cone and the red copper pipe caused by extrusion during reaming in the prior art is changed to rolling friction to a certain extent, which reduces the heat generated by sliding friction. The heat generated by the inner wall of the red copper pipe during reaming by the reamer cone is avoided, the thermal stress is reduced, and the reamer cone is facilitated to be separated.

[0012] Further technical solutions are that the taper-removing structure further comprises a heating belt arranged on the outer wall of the copper pipe to be expanded;

[0013] The copper pipe to be expanded is a valve disc connecting pipe of a cargo ship ice storage, and the copper pipe to be expanded is a red copper pipe. The outer wall of the red copper pipe is heated, so that the red copper pipe is heated while being expanded. The inner and outer walls of the red copper pipe are heated during the expansion, which avoids that only the inner wall of the red copper pipe is heated during the expansion by the expansion taper, and reduces thermal stress. The expansion taper is beneficial to be separated.

[0014] Further technical solutions are that the inner wall of the expansion cylinder pad is provided with an expansion joint, and the expansion joint is close to the upper end of the expansion cylinder pad. The flexible element of the expansion joint arranged on the inner wall of the expansion cylinder pad can reduce thermal stress caused by heat generation of the inner wall of the red copper pipe due to expansion deformation and heating of the outer wall by the heating belt, and plays a role in compensating deformation.

[0015] Further technical solutions are that the expansion cylinder pad is tubular, and the inner hole of the expansion cylinder pad is in the form of a stepped hole, and the part far from the expansion taper is a circular hole matched with the red copper pipe to be expanded;

[0016] The size of the part of the inner hole of the expansion cylinder pad abutting against the expansion taper is greater than the size of the expansion hole of the red copper pipe after expansion. The part of the inner hole of the expansion cylinder pad abutting against the expansion taper is in the form of a conical hole. The part of the inner hole of the expansion cylinder pad abutting against the expansion taper is greater in size than the size of the expansion hole of the red copper pipe after expansion, which can provide sufficient deformation space for the expansion joint, and provide sufficient deformation space for the expanded red copper pipe, thereby reducing thermal stress.

[0017] The advantages and beneficial effects of the present application are that the expansion taper in the form of a pointed bolt can directly use existing workpieces on the spot in the workshop, which is convenient for preparation and saves cost. In addition, the expansion cylinder pad in the form of a screw rod seat matched with the pointed bolt on the spot in the workshop can ensure the orientation of the expansion taper during expansion through the matching relationship between the threads on the outer wall of the pointed bolt and the internal threads on the inner wall of the screw rod seat, and ensure that the expanded hole is not skewed. The expansion taper in the form of a cone and a cylindrical rod integrated with the cone can be customized according to the expansion condition.

[0018] The two different tapers of the expansion tapers are used for twice expansion, which is beneficial to metal flow. The taper of the second expansion taper is 25-35°, and the taper of the first expansion taper is 15-20°, which effectively improves the cracking problem of the upper end of the pipe blank caused by expansion (due to the different metal flow and displacement characteristics of the expansion taper and the trumpet mouth of the pipe to be expanded under different matching, the small-angle expansion is used first, and then the large expansion angle required finally is used, a more reasonable matching is formed between the expansion taper and the trumpet mouth of the pipe to be expanded, which is more beneficial to metal flow during expansion deformation, and effectively improves the cracking problem of the upper end of the pipe blank caused by expansion).

[0019] The rolling ball is arranged on the outer wall of the conical part, the sliding friction between the existing technology reaming cone and the copper tube is replaced by the rolling friction to a certain extent, and the heat generated by the sliding friction is reduced.

[0020] The outer wall of the copper tube is heated, the copper tube is heated on the inner and outer walls during reaming, the heat stress is reduced by avoiding the heat generated on the inner wall of the copper tube during reaming by the reaming cone, and the reaming cone is separated.

[0021] The inner wall of the reaming cylinder pad is provided with an expansion joint, so that the heat stress caused by the deformation of the copper tube during reaming is reduced, and the deformation is compensated.

[0022] The inner hole of the reaming cylinder pad is larger than the size of the reaming hole of the copper tube after reaming, so that the expansion joint has enough deformation space to give the reaming copper tube enough deformation space and reduce the heat stress. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a schematic view of a copper pipe reamer tool embodiment one of the present application;

[0024] Figure 2 is a schematic view of a reaming cone in Figure 1 ;

[0025] Figure 3 is a schematic view of a reaming cylinder pad in Figure 1 ;

[0026] Figure 4 is a top view of a bottom plate in Figure 1 ;

[0027] Figure 5 is a schematic view of embodiment two of the present application;

[0028] Figure 6 is a schematic view of the upper end of a reaming cylinder pad in Figure 5 ;

[0029] Figure 7 is a schematic view of an expansion joint in Figure 6 ;

[0030] Figure 8 is a schematic view of a reaming cone in Figure 7 ;

[0031] Figure 9 is a schematic view of a reaming cone in Figure 5 ;

[0032] In the diagram: 1. Expanding cone; 2. Handle; 3. Expanding cylinder pad; 4. Base plate; 5. Ball bearing; 6. Heating belt; 7. Expansion joint; 8. Graphite powder channel; 9. Annular channel; 10. Electric heating wire. Detailed Implementation

[0033] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0034] Example 1:

[0035] like Figures 1 to 4 As shown, this invention is a copper tube reamer fixture, including a reaming cone 1, which is fixedly connected to a handle 2, with its rotation axis perpendicular to the length direction of the handle 2. The reaming cone 1 is positioned at the center of the handle 2's length direction. The reamer fixture also includes a reaming sleeve 3 that matches the reaming cone 1, with a base plate 4 integrally connected to the end of the reaming sleeve 3 away from the reaming cone 1. The reaming sleeve 3 is adapted to the copper tube to be reamed. The reaming cone 1 is a pointed bolt. The reaming cone 1 and the handle 2, fixedly connected together, constitute a reaming structure. Two reaming structures are provided, one with a pointed bolt taper of 15°–20°, and the other with a pointed bolt taper of 25°–35°.

[0036] The main configuration list is as follows:

[0037] 1. Handle (material Q235-A);

[0038] 2. Lead screw (i.e., bore-reducing taper, material Q235-A);

[0039] 3. Lead screw seat (i.e., expanded hole gasket, material Q235-A);

[0040] 4. Seat plate (material Q235-A);

[0041] The technical parameters are as follows:

[0042] 1. Handle φ16*160

[0043] 2. Lead screw M27*70

[0044] 3. Lead screw seat M27*80

[0045] 4. Seat plate φ100*15

[0046] The working principle is as follows:

[0047] Only need to put the copper tube in the inner hole of the reaming cylinder pad 3, tighten the handle 2, extrude the copper tube through the cone body part of the reaming cone 11, the reaming purpose can be achieved.

[0048] In addition, since two sets of reaming structure are adopted, the reaming cone 11 with smaller taper is used to preliminarily ream the copper tube, and then the reaming cone 1 with larger taper is used to finally ream the copper tube.

[0049] Example two:

[0050] The difference from example one is that, as shown in Figures 5 to 9 (only one section of the electric heating wire is shown for the convenience of illustration, Figure 9 the electric heating wire actually covers the entire annular channel), the reaming cone 1 and the de-taper structure of the reaming cone 1 are included, the de-taper structure includes the reaming cone 1, the ball 5 is rotatably arranged on the outer wall of the cone body part of the reaming cone 1. The de-taper structure also includes the heating belt 6 which is arranged on the outer wall of the copper tube to be reamed; the copper tube to be reamed is the valve disc connecting pipe of the ice storage of the bulk carrier, and the copper tube to be reamed is the red copper tube. The inner wall of the reaming cylinder pad 3 is provided with the expansion joint 7, and the expansion joint 7 is close to the upper end of the reaming cylinder pad 3. The reaming cylinder pad 3 is tubular, the inner hole of the reaming cylinder pad 3 is in the shape of a stepped hole, and the part far from the reaming cone 1 is a circular hole which is suitable for the copper tube to be reamed; the size of the part of the inner hole of the reaming cylinder pad 3 which abuts against the reaming cone 1 is larger than the size of the reamed red copper tube; the part of the inner hole of the reaming cylinder pad 3 which abuts against the reaming cone 1 is in the shape of a conical hole. The de-taper structure also includes the graphite powder channel 8 which is arranged in the reaming cone 1, one end of the graphite powder channel 8 leads to the ball 5 which is rotatably arranged on the outer wall of the reaming cone 1, and the other end of the graphite powder channel 8 penetrates through the handle 2 and the port of the other end is located on the outer surface of the handle 2. The de-taper structure also includes the electric heating wire 10 which is arranged on the outer wall of the graphite powder channel 8. Correspondingly, the annular channel 9 for accommodating the electric heating wire 10 is arranged in the reaming cone 1. The annular channel 9 is located outside the graphite powder channel 8 and the annular channel 9 and the graphite powder channel 8 are concentrically arranged.

[0051] The working principle is as follows:

[0052] The outer wall of the copper tube at the reaming height is tightly wrapped with the heating belt 6, then the copper tube is placed in the inner hole of the reaming cylinder pad 3, the handle 2 is tightened, the copper tube is extruded through the cone body part of the reaming cone 11, and the reaming purpose can be achieved. The arrangement of the ball 5 reduces the heat generated by friction, which can reduce the excessive heating of the inner wall of the red copper tube, reduce thermal stress, and facilitate de-tapering (i.e. the separation of the reaming cone 1 and the reamed copper tube). The work of the heating belt 6 makes the outer wall of the red copper tube also heat up, which avoids the heating of only the inner wall of the red copper tube when the reaming is performed through the reaming cone 1, reduces thermal stress, and facilitates the separation of the reaming cone 1. The inner wall of the reaming cylinder pad 3 at the reaming position is provided with the expansion joint 7 for accommodating thermal deformation, reducing thermal stress, and facilitating de-tapering.

[0053] The tapering-off structure also comprises a local cooling structure, that is, the graphite powder channel 8. After the hole is expanded, the tapering-off (similar to demolding) is needed. However, the expanding taper 1 is difficult to be separated from the red copper pipe due to the friction and heat effect when the expanding taper 1 is tightly abutted against the inner wall of the red copper pipe during the hole expansion. However, the graphite powder channel 8 can be used to add graphite powder into the graphite powder channel 8 after the hole is expanded. The temperature of the added graphite powder is lower than the temperature of the hole expansion position, so that the temperature of the hole expansion position can be appropriately reduced, and the tapering-off is facilitated. In addition, the graphite powder can be used for lubrication. After the hole is expanded, the worker continues to rotate the handle 2. However, the handle 2 is rotated while being pulled upward. The added graphite powder, in cooperation with the rolling ball 5 arranged on the outer wall of the taper, can facilitate the tapering-off. In order to reduce the thermal stress and cracking as much as possible, the electric heating wire 10 is arranged on the outer wall of the graphite powder channel 8. The heating time of the electric heating wire 10 is controlled according to the temperature of the hole expansion position, so that the temperature of the added graphite powder is not too low, and the thermal stress caused by the introduction of the graphite powder with low temperature is avoided.

[0054] The above only describes the preferred embodiments of the present application. It should be noted that those skilled in the art can make some improvements and refinements without departing from the technical principles of the present application. These improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A copper tube reamer tool characterized by, The application relates to a reamer and a reaming structure of the reamer, wherein the reamer is fixedly connected with a handle and the rotating axis of the reamer is perpendicular to the length direction of the handle; and the reamer is arranged at the center position of the length direction of the handle. The reamer tool further comprises a reamer sleeve pad matched with the reamer, the bottom plate is fixedly connected or integrally connected to the end of the reamer sleeve pad away from the reamer, the reamer sleeve pad is matched with the copper pipe to be reamed, the inner wall of the reamer sleeve pad is provided with an expansion joint, the expansion joint is close to the upper end of the reamer sleeve pad, the reamer sleeve pad is tubular, the inner hole of the reamer sleeve pad is stepped and the part away from the reamer is a round hole matched with the copper pipe to be reamed. The reamer comprises a pointed bolt or a cone and a cylindrical rod integrally formed with the cone, the cylindrical rod is fixedly connected with the handle, the reamer and the handle are fixedly connected to form a whole reaming structure, the reaming structure is provided with two, the taper of the pointed bolt or the cone in one of the reaming structures is 15-20 DEG, and the taper of the pointed bolt or the cone in the other reaming structure is 25-35 DEG. The reamer further comprises a heating belt arranged on the outer wall of the copper pipe to be reamed. The copper pipe to be reamed is a valve disc connecting pipe of a freezer of a bulk carrier, and the copper pipe to be reamed is a red copper pipe. The size of the part of the inner hole of the reamer sleeve pad abutting against the reamer is larger than that of the reaming hole of the reamed red copper pipe; and the part of the inner hole of the reamer sleeve pad abutting against the reamer is a conical hole. A graphite powder channel is arranged in the reamer, one end of the graphite powder channel is connected with the ball arranged on the outer wall of the reamer, the other end of the graphite powder channel penetrates through the handle and the port is located on the outer surface of the handle, the temperature of the graphite powder added into the graphite powder channel is lower than that of the reaming position, and the outer wall of the graphite powder channel is provided with an electric heating wire.

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