阅读说明：本技术 钛合金手机边框的加工工艺 (Processing technology of titanium alloy mobile phone frame ) 是由 朱卫 于 2019-11-14 设计创作，主要内容包括：本发明公开了一种钛合金手机边框的加工工艺,包括对钛合金棒材进行连续循环十二次的轧制、热处理制成条状的手机边框半成品型材；轧制工序采用至少一对轧辊轧制钛合金棒材,轧辊其用于轧制的曲面上设有环形凸起和/或环形凹陷,环形凸起及环形凹陷与其对应的轧辊同心设置,环形凸起及环形凹陷与每次轧制后的型材形状相仿形适配；热处理采用管式炉,热处理温度为600±20℃,管式炉长度为6米,钛合金棒材通过管式炉的速度为3m/min。本发明舍弃以往采用CNC机加工的方式而改用轧制,省工省料省时,省材料,料重比好,多次轧制热处理的方式解决了TC4钛合金难加工难成形的问题,轧制形成手机边框半成品型材,减少后续雕刻加工成手机边框的加工量。(The invention discloses a processing technology of a titanium alloy mobile phone frame, which comprises the steps of continuously and circularly rolling a titanium alloy bar for twelve times and carrying out heat treatment to prepare a strip-shaped mobile phone frame semi-finished section; the rolling process adopts at least one pair of rollers to roll the titanium alloy bar, the curved surface of the roller for rolling is provided with an annular bulge and/or an annular recess, the annular bulge and the annular recess are concentrically arranged with the corresponding roller, and the shape of the annular bulge and the annular recess is similar to the shape of the rolled section bar; the heat treatment adopts a tube furnace, the heat treatment temperature is 600 +/-20 ℃, the length of the tube furnace is 6 meters, and the speed of the titanium alloy bar passing through the tube furnace is 3 m/min. The method replaces the traditional CNC machining mode with rolling, saves labor, materials and time, has good material-weight ratio, solves the problem that the TC4 titanium alloy is difficult to machine and form in a multi-rolling heat treatment mode, rolls to form the semi-finished section of the mobile phone frame, and reduces the machining amount of the mobile phone frame formed by subsequent engraving.)

1. The processing technology of the titanium alloy mobile phone frame is characterized by comprising the steps of continuously circulating for twelve times, rolling and carrying out heat treatment on a titanium alloy bar to prepare a strip-shaped mobile phone frame semi-finished product section; the rolling process adopts at least one pair of rollers to roll the titanium alloy bar, the curved surface of the roller for rolling is provided with an annular bulge and/or an annular recess, the annular bulge and the annular recess are concentrically arranged with the corresponding roller, and the shape of the annular bulge and the annular recess is similar to the shape of the rolled section bar; the heat treatment adopts a tube furnace, the heat treatment temperature is 600 +/-20 ℃, the length of the tube furnace is 6 meters, and the speed of the titanium alloy bar passing through the tube furnace is 3 m/min.

2. The processing technology of the titanium alloy mobile phone frame according to claim 1, wherein the material of the titanium alloy bar is titanium alloy TC 4.

3. The processing technology of the titanium alloy mobile phone frame according to claim 2, wherein the rolling amount of each rolling process is 6-8%.

4. The processing technology of the titanium alloy mobile phone frame according to claim 1 or 3, characterized in that when rolling a titanium alloy bar, the back plate of the counter case is continuously cold-rolled on line at the same time, the rollers for continuously cold-rolling the back plate of the counter case on line are connected with the rollers for rolling the titanium alloy bar, the rollers for continuously cold-rolling the back plate of the counter case on line are provided with N pairs, N is less than 12, each pair of rollers for continuously cold-rolling the back plate of the counter case on line is composed of a first roller and a second roller in pair, the curved surface of the first roller for rolling is provided with a plurality of convex blocks, the distance is arranged between the adjacent convex blocks, and the curved surface of the second roller for rolling is provided with recesses matched; the height of the lug of the first roller in the subsequent procedure is higher than that of the lug of the first roller in the previous procedure along the feeding direction.

5. The processing technology of the titanium alloy mobile phone frame according to claim 4, wherein a roller for on-line continuous cold rolling of the back plate of the mobile phone case and a roller for rolling the titanium alloy bar are coaxially arranged.

6. The processing technology of the titanium alloy mobile phone frame according to claim 4, wherein a roller for continuously cold rolling the back plate of the mobile phone case on line is connected with a roller for rolling the titanium alloy bar through a gear set.

Technical Field

The invention relates to a processing technology of a titanium alloy mobile phone frame.

Background

The metal material that traditional cell-phone shell adopted is mostly the aluminum alloy, along with the coming of the 5G era and people's improvement to the cell-phone aesthetic measure requirement, metallic aluminum because of having factors such as interference and feel difference to the signal, can not satisfy the functional design requirement of cell-phone and consumer's psychological demand, so must seek a new alternative material to make the cell-phone shell. The titanium alloy has the characteristics of high specific strength, biological affinity, good sound permeability, good metal texture and the like, and simultaneously represents the identity characteristics of high-end atmosphere and the like, so the titanium alloy is the most main metal material selected for the mobile phone shell in the age of 5G.

The shape of the mobile phone shell is complex, the specification is small, and the size precision is high. From the manufacturing process route, the mobile phone shell can be molded by adopting a plate direct CNC (computer numerical control) machining mode, a 3D (three-dimensional) printing or casting mode or a CNC machining mode to produce a finished product, and a conventional free forging or die forging method is difficult to mold a forged blank of the mobile phone shell.

Compared with aluminum, the titanium alloy has high specific strength and poor thermal conductivity, so when CNC machining is adopted, metal is easy to stick to a cutter, the cutting speed is low, the cutter loss is serious, the production efficiency is extremely low, and the titanium alloy can not be compared with aluminum far away. When the mobile phone shell is produced by adopting a plate material to directly carry out CNC (computerized numerical control) processing method, the processing period of a single mobile phone shell is about 10-20 hours, the mobile phone market capacity is large, and although the CNC equipment of domestic mobile phone generation factories is many, the market demand can not be met far under the production efficiency; meanwhile, when the plate is directly machined, most materials need to be cut off finally, the machining yield is less than 50%, the material utilization rate is low, the price of the titanium alloy material is high, the cost of raw materials is high, and the CNC machining tool is different from a metal aluminum tool, so that the tool loss is serious, and the material consumption cost is high.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, provide a processing technology of a titanium alloy mobile phone frame, save materials, have a good material-to-weight ratio of processed products, solve the problem that TC4 titanium alloy is difficult to process and form in a multi-rolling heat treatment mode, roll and form a mobile phone frame semi-finished section bar, and reduce the processing amount of the mobile phone frame processed by subsequent engraving.

In order to achieve the purpose, the technical scheme of the invention is to design a processing technology of a titanium alloy mobile phone frame, which comprises the steps of continuously and circularly rolling and thermally processing a titanium alloy bar for twelve times to prepare a strip-shaped mobile phone frame semi-finished section; the rolling process adopts at least one pair of rollers to roll the titanium alloy bar, the curved surface of the roller for rolling is provided with an annular bulge and/or an annular recess, the annular bulge and the annular recess are concentrically arranged with the corresponding roller, and the shape of the annular bulge and the annular recess is similar to the shape of the rolled section bar; the heat treatment adopts a tube furnace, the heat treatment temperature is 600 +/-20 ℃, the length of the tube furnace is 6 meters, and the speed of the titanium alloy bar passing through the tube furnace is 3 m/min. The strip-shaped mobile phone semi-finished product section has a section shape which is similar to the mobile phone frame in a copying way; and bending the semi-finished section bar of the mobile phone frame, and welding the bent section bar with a backboard of the mobile phone shell to manufacture the mobile phone shell. The method does not adopt a CNC engraving processing mode, reduces the waste of raw materials, adopts the strip shape which is formed after multiple times of rolling and is very close to the shape of the mobile phone frame, and only needs little processing amount for subsequent reprocessing.

The further technical scheme is that the titanium alloy bar is made of titanium alloy TC 4.

The further technical scheme is that the rolling quantity of each rolling procedure is 6-8%.

The further technical scheme is that when the titanium alloy bar is rolled, the back plate of the opposite case is continuously cold-rolled on line at the same time, the rolls for continuously cold-rolling the back plate of the opposite case on line are connected with the rolls for rolling the titanium alloy bar, the rolls for continuously cold-rolling the back plate of the opposite case on line are provided with N pairs, N is less than 12, each pair of rolls for continuously cold-rolling the back plate of the opposite case on line are formed by a first roll and a second roll in pair, a plurality of convex blocks are arranged on the curved surface of the first roll for rolling, intervals are arranged between the adjacent convex blocks, and the curved surface of the second roll for rolling is provided with a recess matched; the height of the lug of the first roller in the subsequent procedure is higher than that of the lug of the first roller in the previous procedure along the feeding direction. After the titanium alloy plate is rolled into the back plate with the bumps, the back plate is cut on line, the cut semi-finished frame profile and the back plate with the bumps are transferred to the next process, the strip-shaped semi-finished frame profile is bent after being processed, then the strip-shaped semi-finished frame profile and the back plate are welded to form the mobile phone shell, the processing process of the bumps on the back surface of the back plate is placed into the rolling process of the frame of the titanium alloy mobile phone, the production efficiency is improved, and the working hours are greatly saved. And the height of the bump is gradually increased along with the backward process of the process, so that the processing rule of the titanium alloy material is met, and the processing defect easily caused by one-time large deformation is avoided.

The further technical scheme is that a roller for carrying out online continuous cold rolling on the back plate of the hand casing and a roller for rolling the titanium alloy bar are coaxially arranged.

The further technical scheme is that a roller for continuously cold rolling the back plate of the hand casing on line is connected with a roller for rolling the titanium alloy bar through a gear set. The speed of the roller for rolling the titanium alloy bar is reduced through the gear set for reducing the speed and then the roller is transmitted to the roller for continuously rolling the back plate of the mobile phone shell on line, so that the mobile phone back plate with the bulge formed by rolling is ensured to have better shape tolerance.

The invention has the advantages and beneficial effects that: the traditional mode of CNC machining is replaced by rolling, so that the labor, materials and time are saved, the materials are saved, the material-weight ratio is good, the problem that the TC4 titanium alloy is difficult to machine and form is solved by a mode of multiple rolling heat treatment, a semi-finished section of the mobile phone frame is formed by rolling, and the processing amount of the mobile phone frame formed by subsequent carving and processing is reduced; the processing process of the bumps on the back surface of the back plate is placed in the rolling process of the frame of the titanium alloy mobile phone, so that the production efficiency is improved, and the working hours are greatly saved. And the height of the bump is gradually increased along with the backward process of the process, so that the processing rule of the titanium alloy material is met, and the processing defect easily caused by one-time large deformation is avoided. The speed of the roller for rolling the titanium alloy bar is reduced through the gear set for reducing the speed and then the roller is transmitted to the roller for continuously rolling the back plate of the mobile phone shell on line, so that the mobile phone back plate with the bulge formed by rolling is ensured to have better shape tolerance.

Drawings

FIG. 1 is a schematic view of a first processing procedure of a first processing technique of a titanium alloy mobile phone frame according to an embodiment of the present invention;

FIG. 2 is a longitudinal cross-sectional view of the two pairs of rolls for rolling the titanium alloy bar furthest to the left in FIG. 1;

FIG. 3 is a schematic longitudinal cross-sectional view of a pair of rolls to the right of the leftmost tube furnace of FIG. 1;

FIG. 4 is a schematic view of rolls for another rolling process in accordance with one embodiment of the present invention;

FIG. 5 is an enlarged schematic view of a middle portion of FIG. 4;

FIG. 6 is a schematic view of a second embodiment of the present invention;

FIG. 7 is a schematic view of the rolled back plate of FIG. 6;

fig. 8 is a schematic view of the mobile phone case after the frame and the back plate are welded.

In the figure: 1. a titanium alloy bar; 2. semi-finished section bars; 3. rolling; 4. an annular projection; 5. an annular recess; 6. a tube furnace; 7. a back plate; 8. a first roller; 9. a second roller; 10. a bump; 11. a titanium alloy sheet; 12. a gear set.

Detailed Description

The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.