MAGNESIUM ALLOY BUTTED TUBE DRAWING MECHANISM

Abstract

A magnesium alloy thick and thin tube butting mechanism is disclosed in the utility model and includes a tube butting mold, a tube butting mandrel, and a hydraulic actuator. The tube butting mold has a mold heating component used for magnesium alloy tube to enter a tube wire drawing mold. A material is heated. The magnesium alloy thick and thin tube butting mechanism may further include a tube heating component configured to pre-heat the magnesium alloy tube before the magnesium alloy tube enters a tube mold.

Claims

1. A magnesium alloy thick and thin tube butting mechanism, comprising a tube butting mold, a tube butting mandrel, and a hydraulic actuator, wherein a mold heating component is disposed inside the tube butting mold and is configured to heat magnesium alloy tubing entering the tube butting mold.

2. The magnesium alloy thick and thin tube butting mechanism according to claim 1, wherein the mold heating component is a resistive heater.

3. The magnesium alloy thick and thin tube butting mechanism according to claim 1, further comprising a tubing heating component, the tubing heating component being configured to rapidly heat the magnesium alloy tubing before the magnesium alloy tubing enters the tube butting mold.

4. The magnesium alloy thick and thin tube butting mechanism according to claim 3, wherein the tubing heating component is an electromagnetic induction heating coil, and the electromagnetic induction heating coil is connected to a high-frequency induction heating power supply.

5. The magnesium alloy thick and thin tube butting mechanism according to claim 3, wherein the tubing heating component and the tube butting mold are coaxially arranged.

6. The magnesium alloy thick and thin tube butting mechanism according to claim 1, further comprising a baffle, the baffle being provided with a through-hole for the tube butting mandrel to exit.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0013] FIG. 1 is a schematic structural diagram of a magnesium alloy thick and thin tube;

[0014] FIG. 2 is a schematic structural diagram of a magnesium alloy thick and thin tube butting mechanism according to the utility model;

[0015] FIG. 3 is a diagram of a changing process of an end socket structure when performing head retracting on a magnesium alloy tubing in a process of forming and molding a double-butted tube;

[0016] FIG. 4 is a diagram of a tube butting process of a magnesium alloy tubing when using a first mold mandrel for tube butting in a process of forming and molding a double-butted tube; and

[0017] FIG. 5 is a diagram of a tube butting process of a magnesium alloy tubing when using a second mold mandrel for tube butting in a process of forming and molding a double-butted tube.

DETAILED DESCRIPTION

[0018] The technical solutions of the utility model are further described with reference to the accompany drawings.

[0019] As shown in FIG. 2, a magnesium alloy thick and thin tube butting mechanism according to the utility model is provided, including a base 8, a tube butting mold 1, a tube butting mandrel, and a hydraulic actuator 6.

[0020] The tube butting mold 1 fits the tube butting mandrel, and the tube butting mandrel is placed into magnesium alloy tubing 7. The magnesium alloy tubing 7 of an equal wall thickness may be formed and molded into a magnesium alloy thick and thin tube by using an outer size of the tube butting mandrel and a size of an inner bore of the tube butting mold 1. The tube butting mold 1 is fixed on the base 8, a mold heating component 2, for example, a resistive heater, is disposed inside the tube butting mold 1. The tube butting mold 1 may be heated to a certain tube butting process temperature according to process requirements. When the magnesium alloy tubing 7 enters the tube butting mold 1, tube butting may be completed in a heated state, and plasticity of the magnesium alloy may be effectively improved, so that a problem that the magnesium alloy thick and thin tube deforms and cracks during the tube butting and cannot be formed and molded may be resolved. The size and quantity of the adopted tube butting mandrel are different as structures of the magnesium alloy thick and thin tubes are different. For example, as shown in FIG. 1, for a magnesium alloy thick and thin tube 9 of which two sides are thick and a middle part is thin, the tube butting process needs two tube butting mandrels of different sizes, including a first mold mandrel 41 and a second mold mandrel 42.

[0021] The hydraulic actuator 6 is fixed on the base 8 and may be a hydraulic cylinder. The hydraulic actuator 6 is connected to a hydraulic control system, and the hydraulic control system provides power for the hydraulic actuator 6, so that the hydraulic actuator 6 is capable of pushing the tube butting mandrel to drive the magnesium alloy tubing 7 to perform a reciprocating motion, to enter or exit the tube butting mold 1.

[0022] The magnesium alloy thick and thin tube butting mechanism according to the utility model may further include a tubing heating component 3. The tubing heating component 3 is located at a front end of the tube butting mold 1, and may rapidly pre-heat the magnesium alloy tubing 7 before the magnesium alloy tubing 7 enters the tube butting mold 1, and the tube butting may be prevented from being affected because of a too-slow heat-up speed of the magnesium alloy tubing entering the tube butting mold by using rapid pre-heating. The tubing heating component 3 may be an electromagnetic induction heating coil, which is connected to a high-frequency induction heating power supply. The high-frequency induction heating power supply provides a heating current for the electromagnetic induction heating coil.

[0023] A baffle 5 is further fixed on the base 8 of the magnesium alloy thick and thin tube butting mechanism. The baffle 5 is provided with a through-hole. A bore diameter of the through-hole is slightly greater than an outer diameter of the tube butting mandrel and less than an outer diameter of the magnesium alloy thick and thin tube. When the tube butting mandrel drives the magnesium alloy tubing to return, the tube butting mandrel may exit, and the magnesium alloy tubing is baffled at the same time, so that the tube butting mandrel and the magnesium alloy tubing are separated, and the tube butting is completed.

[0024] During operation, the tube butting mold 1 is heated to a certain tube butting process temperature by using the mold heating component 2, and then, the hydraulic actuator 6 pushes the tube butting mandrel to drive the magnesium alloy tubing 7 to first be rapidly pre-heated through the tubing heating component 3 and then enter the tube butting mold, and the tube butting process is completed.

[0025] An operation process of the magnesium alloy thick and thin tube according to the utility model is described by using an example in which the magnesium alloy thick and thin tube 9 in FIG. 1 is formed and molded. In this example, the magnesium alloy thick and thin tube 9 is a double-butted tube, and tube butting needs to be completed by using two tube butting mandrels of different sizes, which are the first mold mandrel 41 and the second mold mandrel 42 respectively. At the same time, in this example, a resistive heater is adopted by the mold heating component 2, an induction heating coil is adopted by the tubing heating component 3, and a hydraulic cylinder is adopted by the hydraulic actuator 6.

[0026] The operation process of the tube butting by using a magnesium alloy thick and thin tube butting mechanism according to the utility model is as follows:

[0027] (1) head retracting: as shown in FIG. 3 (a), the magnesium alloy tubing 7 is inserted into a conoid inner bore mold 10, and the temperature of the mold is between 200° C. and 400° C., and as shown in FIG. 3 (b), an end socket of the magnesium alloy tubing 7 is shaped in a cone;

[0028] (2) tube butting:

[0029] A. A first mold: as shown in FIG. 4, the magnesium alloy tubing 7 after head retracting is inserted into the first mold mandrel 41 of which an outer size is a size of the inner bore of the thick and thin tube. The first mold mandrel 41 is pressed against the head retracting part of the magnesium alloy tubing 7, and the hydraulic cylinder is started to push the magnesium alloy tubing 7 to pass through the induction heating coil and the inner bore of the tube butting mold 1. The outer size of the first mold mandrel 41 and the size of the inner bore of the tube butting mold 1 form the magnesium alloy thick and thin tube together. During the tube butting, the tube butting mold 1 is heated by the resistive heater to maintain a temperature between 200° C. and 400° C. to ensure that cracking does not occur to the magnesium alloy butted tube. During a return process of the first mold mandrel 41, the magnesium alloy tubing 7 is baffled by the baffle 5, and in this case, the first mold mandrel 41 exits, and the first mold of the tube butting is completed;

[0030] B. A second mold: because a diameter of a middle section of the first mold mandrel 41 is greater than a size of an inner bore at a tail end of the magnesium alloy thick and thin tube, during the process in which the first mold mandrel 41 exits, a diameter of the magnesium alloy tube at the tail end is enlarged by the first mold mandrel 41. As shown in FIG. 5, secondary tube butting is performed on the magnesium alloy tubing 7 by using the second mold mandrel 42 having a size slightly less than the size of the inner bore of the magnesium alloy and a same outer mold. A raised part at the tail end is flattened to obtain a magnesium alloy thick and thin tube having a consistent outer diameter and different inner diameters.