JPS61132230A - Manufacturing device of heat transfer tube with internal groove - Google Patents

Abstract

PURPOSE:To reduce manufacturing costs by setting a groove forming disk on a hydraulic chuck of a lathe and pressing both a backup roll and the disk against the outside of the tube. CONSTITUTION:The groove forming disk 2 is set on the claw of the hydraulic chuck of the lathe and the backup roll 3 supporting the heat transfer tube 1 is also installed. The tube 1 is pulled in its axial direction, while both the disk 2 and the roll 3 are pressed and revolved simultaneously against and on the outside of the tube 1, respectively. This method forms a groove on the inside surface of the tube 1 and a groove lead angle 4 can easily be varied within 0-90 deg. by changing a holder of the disk 2. Manufacturing costs are reduced because the load angle 4 is variable in a wide range and its variation is performed by a simple device.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to an apparatus for forming grooves on the inner surface of a heat transfer tube, and in particular to a manufacturing apparatus that is easy to process and inexpensive.

[Prior Art 1] Conventionally, as a processing device for forming grooves on the inner surface of a heat transfer tube, there has been a drawing device that uses a die, a plug, or a steel ball.

[Problems to be solved by the invention] These devices use a die to obtain a predetermined inner groove shape;
The setting of the plug is complicated, the groove lead angle is limited to a maximum of 830° with respect to the tube axis, and the volume of the groove portion increases, resulting in an increase in product cost.

An object of the present invention is to solve the problems of the conventional techniques described above, and to make the product easy to process and inexpensive. An object of the present invention is to provide an apparatus for manufacturing a heat transfer tube with internal grooves.

[Means for Solving the Problems 1] The manufacturing apparatus according to the present invention is such that a grooving disk is attached to a hydraulic chuck for a lathe, and a heat transfer tube whose inner surface is to be grooved is supported by backup rolls.

[Function] In the present invention, the groove processing disk and the backup roll are simultaneously pressed from the outside of the heat transfer tube, and the heat transfer tube is moved in the axial direction of the heat transfer tube while revolving around the outside of the heat transfer tube. grooves on the inner surface of the heat transfer tube.

[Embodiment] FIGS. 1 and 2 are a side view and a plan view showing an embodiment of a manufacturing apparatus according to the present invention. In the figure, 1 is a heat transfer tube with grooves on its inner surface, such as a smooth metal tube, 2 is a grooving disk attached to the pawl (not shown) of a hydraulic chuck for a lathe that can be opened and closed, and 3 is a pawl of the same hydraulic chuck. (not shown), which supports the heat transfer tube 1, is the lead angle formed with the tube axis of the heat transfer tube 1.

In the manufacturing apparatus configured as described above, the grooving disk 2 and the backup roll 3 are simultaneously pushed in from the outside of the heat transfer tube 1, and while rotating the outside of the heat transfer tube 1, the heat transfer tube 1 is moved in the direction of the arrow. A groove is formed on the inner surface of the heat transfer tube by pulling it out in the direction of , that is, in the direction of the tube axis. The lead angle 4 can be easily changed from 0° to 90° by replacing the disc boulder of the grooving disc 2.

[Effects of the Invention] According to the present invention, (1) grooves can be easily formed on the inner surface of the heat transfer tube because no dies or plugs are used, and (2) the lead angle of the inner groove is between 0° and 90°. In addition, (3) since the internal grooves are provided without increasing the volume, an inexpensive heat transfer tube with internal grooves can be produced.

[Brief explanation of drawings]

FIG. 1 is a side view showing an embodiment of the present invention, and FIG. 2 is a plan view of the embodiment shown in FIG. 1 is a heat transfer tube, 2 is a groove processing disk, 2A is a disk holder, 3 is a backup roll, and 4 is a lead angle.

Claims (1)

[Claims] (1) A grooving disk attached to a hydraulic chuck for a lathe that can be opened and closed, and a backup roll that supports a heat transfer tube whose inner surface is to be grooved, the disk and the backup roll being accessed from the outside of the heat transfer tube. The inner grooved heat transfer is characterized in that grooves are formed on the inner surface of the heat transfer tube by simultaneously pressing and moving the heat transfer tube in the tube axis direction while rotating the outside of the heat transfer tube. Pipe manufacturing equipment.