COMPOSITE ROD AND ITS PROCESSING METHOD

Abstract

This invention relates to a composite mandrel and its processing technology, including: processing, connection, welding, alloy overlaying, tempering after overlaying, polishing, chrome plating etc., on the whole and auxiliary body of mandrel. The composite mandrel includes a plurality of main and auxiliary bodies, the surface is overlaid with high temperature resistant, wear resistant, thermal fatigue resistant alloy, polished, and chrome plated, obtaining the characteristics of wear resistance, thermal fatigue resistance and high temperature resistance. The whole process not only increase the strength, toughness and hardness of the mandrel, improves its service quality, but also prolong the service life. With simple structure and reliable quality, composite mandrel can meet the requirements of different running condition. Whether for new-made mandrels, or for equal diameter renewal of failed mandrels, composite mandrel process can show its advantages of suitable material quantity, energy saving, consumption reduction, and production cost reduction.

Claims

1. A composite core rod, comprising: a composite core rod comprising: a core rod main body, a core rod auxiliary body, an internal thread located at the end of the core rod main body, an external thread located at the end of the core rod auxiliary body, an annular shaft groove, an alloy surfacing layer, a electroplated layer, a cone end of the core rod main body, and a tail end connector of the core rod auxiliary body.

2. The composite core rod according to claim 1, wherein: the depth and width, as well as shaft groove distribution of the annular shaft groove on the cylindrical surface of the core rod main body and auxiliary body are designed according to the damage condition of the core rod surface and thickness of the surfacing layer.

3. The composite core rod according to claim 1, wherein the alloy surfacing layer is a high temperature and abrasion-resistant hard alloy layer.

4. The composite core rod according to claim 1, wherein the composite core rod consists of 1-2 core rod main bodies and 0-2 core rod auxiliary bodies.

5. The composite core rod according to claim 1, wherein the type and thickness of the alloy surfacing layer can be selected according to the manufacturing cost of the core rod and specifications of the core rod.

6. The composite core rod according to claim 1, wherein the annealing temperature and method after the surfacing can be selected according to the base material of the core rod and type of the alloy surfacing layer.

7. The composite core rod according to claim 1, wherein the electroplated layer is a metal chromium electroplated layer or a nickel-tungsten alloy electroplated layer.

8. A method of processing the composite core rod of claim 1, comprising: processing the outer circle of the core rod main body and the annular shaft groove processing; processing of outer circle of the core rod auxiliary body and the annular shaft groove processing; processing the internal thread at the end of the core rod main body and the cone end processing; processing external thread at the end of the core rod auxiliary body and the tail end connector processing, the threaded connection and welding of the main and auxiliary bodies of the core rod, welding of the threaded connection; surfacing high-temperature and abrasion-resistant alloy on the cylindrical surface of the core rod, high temperature annealing after surfacing, grinding and polishing alloy surfacing layer, electroplating metal chromium on the whole core rod, and composite core rod inspection; wherein the core rod main body and auxiliary body are connected and welded with the external thread at the end of the core rod auxiliary body through the internal thread at the end of the core rod main body; the alloy surfacing layer is uniformly surfacing welded on the core rod main body, cylindrical surface of the core rod auxiliary body and its annular shaft groove, high temperature annealing after surfacing, after grinding and polishing the alloy surfacing layer, electroplating metal chromium on the cylindrical surface of the core rod to form a layer of electroplated metal chromium, and finally the composite core rod is inspected; after inspection, the processing and manufacturing of the composite core rod is completed. Otherwise, the composite core rod is reprocessed and manufactured according to the composite core rod processing technology.

Description

DESCRIPTION OF ATTACHED FIGURES

[0021] FIG. 1 depicts structure of the invention;

[0022] FIG. 2 depicts A-A direction enlarged cross-sectional view of the invention;

[0023] FIG. 3 depicts flow chart of the invention.

SPECIFIC EMBODIMENTS

Embodiments

[0024] The invention is further detailed below by combining attached figures and specific embodiments; following embodiments are descriptive rather than restrictive, and shall not restrict protection scope of the invention.

[0025] A composite rod and its processing method; the composite rod comprises: (1) the main body of the rod, (2) the auxiliary body of the rod, (3) the inner thread at end of the main body of the rod, (4) the outer thread at end of the auxiliary body of the rod, (5) the annular shaft slots, (6) the alloy resurfacing welding layer, (7) the electroplating layer, (8) the cone-frustum end of the main body of the rod, (9) the connector at tail of the auxiliary body of the rod; processing method of the composite rod: (10) processing of the outer circle and the annular shaft slot of the main body of the rod, (11) processing of the outer circle and the annular shaft slot of the auxiliary body of the rod, (12) processing of the inner thread at end of the main body of the rod and the cone-frustum end of the main body of rod, (13) processing of the outer thread at end of the auxiliary body of the rod and the connector at tail of the auxiliary body of the rod, (14) connection and welding of the threads of the main body and the auxiliary body of the rod, (15) welding of the thread connection, (16) resurfacing welding of high-temperature and wear-resistant alloy for the entire rod, (17) high-temperature annealing after resurfacing welding, (18) grinding and polishing of the alloy resurfacing welding layer, (19) electroplating chromium for the entire rod, (20) inspection over the composite rod; characteristics: the main body of the rod (1) and the auxiliary body of the rod (2) are connected and welded through the inner thread at end of the main body of the rod (3) and the outer thread at end of the auxiliary body of the rod (4); the alloy resurfacing welding layer (6) is evenly resurfacing welded on cylinder surfaces of the main body of the rod (1) and the auxiliary body of the rod (2) and in the annular shaft slots (5), upon high-temperature annealing after resurfacing welding (17) and grinding and polishing of the alloy resurfacing welding layer (18), electroplating chromium for the entire rod (19) is carried out, the electroplating layer (7) is formed, finally, inspection over the composite rod (20) is conducted, if such inspection is passed, processing and manufacturing of the composite rod is finished, otherwise, processing shall be repeated with the composite rod processing technology.

[0026] Practice has proved that, the composite rods manufactured in accordance with above scheme can satisfy manufacturing technology needs of seamless steel pipes under different diameters, manufacturing costs of rods are reduced, qualities of rods are improved and service lives of rods are extended. The invention is of simple structure and easy operation, it is safe and reliable, it has a wide application range and can be easily promoted and used.

Finally, it shall be clarified that, above embodiments are only for describing rather than restricting technical scheme of the invention; although the invention is described in detail by referring preferred embodiments, common technicians of the field shall understand that: within spirits and scopes of the invention and attached claims, modifying or replacing technical scheme of the invention is possible, therefore, scope of the invention is not limited to the contents disclosed in above embodiments and attached figures, and all contents within spirits and scopes of the invention and attached claims shall be covered by protection scope of the invention.