CURRENT AUXILLARY FRICTION ADDITIVE MANUFACTURING DEVICE AND METHOD

Abstract

The present invention provides a current auxiliary friction additive manufacturing device, which includes a friction coating device, a movable worktable and a current generation device. The device is specially used for current auxiliary friction additive manufacturing. The present invention further provides a current auxiliary friction additive manufacturing method. The present invention promotes interface reaction and interface bonding between a coating and a substrate or between the coatings in the traditional friction additive manufacturing process, and improves the bonding strength and service performance of the coating. The method is suitable for manufacturing various thermoplastic conductive consumables such as friction additives of aluminum alloy.

Claims

1. A current auxiliary friction additive manufacturing device, comprising: a friction coating device 1 with a feeding tool head 2 used to feed consumables; a movable worktable with a substrate 3 fixedly arranged thereon; a current generation device 4 with electrodes connected respectively with the tool head 2 and the substrate 3, used to supply current to an additive manufacturing process.

2. A current auxiliary friction additive manufacturing method using the device of claim 1, comprising conducting continuous solid precipitation on thermoplastic conductive materials under the action of current, and stacking the materials layer by layer to achieve additive.

3. The current auxiliary friction additive manufacturing method according to claim 2, wherein the consumables rotate continuously in a coating process; and the current acts on a contact position between the consumables and a substrate material.

4. The current auxiliary friction additive manufacturing method according to claim 2, wherein in (2) coating phase, the current frequency is 20 kHz-50 kHz, and the current density is 2 A/mm.sup.2-50 A/mm.sup.2.

5. The current auxiliary friction additive manufacturing method according to of claim 2, wherein the action position of a negative electrode of a current generation device on the surface of a substrate has a maximal distance of 50 mm to the edge of the consumable.

6. The current auxiliary friction additive manufacturing method according to claim 2, comprising the following steps: (1) a preparation phase: firstly installing consumables on a friction additive device, installing a substrate on a movable worktable, and then presetting various technological parameters of an additive preparation process; (2) an additive phase: starting the friction additive device and a current device, enabling the consumables and the current to jointly act on the substrate surface and to move relative to the substrate, smearing a first layer on the substrate surface, continuously or intermittently repeating the coating phase, and performing layer-by-layer friction coating and stacking to an n<th> layer, thereby implementing the additive manufacturing; (3) an end phase: raising the consumables, powering off the current application device, and ending the friction additive.

7. The current auxiliary friction additive manufacturing method according to claim 2, wherein during preparation of a single layer, an angle between the consumable and a perpendicular line of the substrate surface is 0°-5°; a rotation speed of the consumable is 900 rpm-8000 rpm; if initial pressing is necessary at the coating phase, an initial pressing depth is 0-5 mm, and an initial pressing speed is 3 mm/min-12 mm/min; an advancing speed at a single-layer phase is 100 mm/min-800 mm/min; and the pressing speed of the consumable in the advancing process is 0.4 mm/s-0.6 mm/s.

8. The current auxiliary friction additive manufacturing method according to claim 2, wherein the materials comprise but are not limited to metals, metal-based composite materials or thermoplastic organic materials.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0030] FIG. 1 is a diagram of a device used in a current auxiliary rotating consumable friction additive manufacturing method;

[0031] FIG. 2 shows additive manufacturing on a bottom of a concave deep groove in the present invention;

[0032] FIG. 3 is a schematic diagram of a test device for bonding performance of an additive coating; and

[0033] FIG. 4 shows a test result of anti-shear capacity of a coating specimen.

DETAILED DESCRIPTION OF THE PRESENT INVENTION

[0034] The present invention is further described below in combination with the accompanying drawings. The embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited by the present embodiment, and any other changes, modifications, substitutions, combinations and simplification made according to the spirit and principle of the present invention should be equivalent replacement modes, and shall be included in the protection scope of the present invention.

EMBODIMENT 1

[0035] As shown in FIG. 1, an aluminum alloy consumable stick 2 is fixed on a friction coating device 1. A positive electrode of a current generation device is connected to the aluminum alloy consumable stick. A negative electrode of the current device is connected to a substrate material which is a steel plate 3.

[0036] During preparation of a single layer, the friction coating device is first started, and then the current generation device 4 (power supply) is started to generate current. Specifically referring to FIG. 1, the aluminum consumable stick for friction coating is first installed on the friction coating device; then the steel plate is fixed as the substrate material; next a coating material comes into contact with the surface of the steel plate during continuous rotation, and the current generation device (power supply) is powered on at the same time; and a current field is synchronously applied. An angle between the aluminum consumable stick and a perpendicular line of a steel plate surface is 0°-3°; a rotating speed of the aluminum consumable stick is 1400 rpm-1800 rpm; the aluminum consumable stick is initially pressed for 2 mm-4 mm, and a pressing speed is 4 mm/min; an advancing speed of the aluminum consumable stick is 75 mm/min-120 mm/min; and in the advancing process, current frequency is 20 kHz-50 kHz, and current density is 2 A/mm.sup.2-50 A/mm.sup.2.

[0037] A schematic diagram of a coating preparation position and an actual coating result are shown in FIG. 2. A prepared coating is located on the bottom of a groove defined by clamps. The friction additive of aluminum alloy is performed on a material on the bottom of the groove defined by the clamps on both sides through the current auxiliary friction additive method.

[0038] A test method for bonding performance of the additive coating includes: a shear specimen of 10 mm*10 mm is prepared on a coating through milling, as shown in FIG. 3.

[0039] The anti-shear capacity of the coating specimen is tested by a 30 KN universal testing machine. A test result of the bonding performance of the additive coating is shown in FIG. 4.

[0040] The anti-shear strength of a conventional friction additive coating is 1298N, and the anti-shear strength of the current auxiliary friction additive coating is 2134N. Compared with the conventional coating, the coating obtained by the current auxiliary way has higher anti-shear strength.