Radial precision forging forming manufacturing process of titanium alloy body tube with elastic wire and bore

Abstract

The application discloses a kind of titanium alloy body tube's elastic line bore integrated radial precision forging forming manufacturing process, first to the titanium alloy bar prepared for hot radial forging to obtain radial forging state bar material and ensure its radial cross-section shrinkage reaches 50% or more, and it is carried out blanking to obtain titanium alloy body tube with distortion state bar material;Subsequently, the titanium alloy body tube with distortion state bar material is carried out deep hole processing to obtain titanium alloy body tube with distortion state pipe material;Then, the titanium alloy body tube with distortion state pipe material is carried out core mould cooperation installation and semi-solid isothermal treatment, obtains semi-solid composite pipe material, and it is carried out semi-solid radial precision forging forming to obtain titanium alloy body tube blank with radial forging state fiber organization and semi-solid fine grain structure simultaneously;Finally titanium alloy body tube blank is carried out finishing and heat treatment to obtain titanium alloy body tube parts.The application has the characteristics of small equipment tonnage load requirement, good product mechanical property.

Description

Technical Field

[0001] The present invention belongs to the technical field of barrel manufacturing, and in particular relates to a radial precision forging manufacturing process for a titanium alloy barrel having a bullet and rifle integrated therein. Background Art

[0002] With the increasing requirements for light equipment, good maneuverability, and strong firepower, the use of titanium alloy instead of alloy steel to make the barrel can significantly reduce the weight of the barrel while meeting the equipment quality indicators, shooting stability and safety, which is the development trend of lightweight equipment.

[0003] The processing and manufacturing process of traditional titanium alloy barrels mainly includes CNC machining of tube materials and radial forging process. However, the use of CNC machining not only results in a large amount of material cutting waste, but also the fiber structure of the material will be cut off; and the traditional radial forging process requires a large amount of deformation during the radial forging of the barrel to ensure the quality of the barrel, which causes the temperature to rise during the forging process, and thus causes the forming quality to decrease. In addition, solid-state forging has high requirements on the tonnage of radial forging equipment. Summary of the Invention

[0004] The purpose of the present invention is to provide a radial precision forging manufacturing process for a titanium alloy barrel with a rifled body, which has the characteristics of low tonnage requirement for radial forging equipment and good performance of the formed parts.

[0005] The technical solution adopted in the present invention is:

[0006] The radial precision forging manufacturing process for the rifled titanium alloy barrel is specifically implemented in the following steps:

[0007] Step 1. Bar preparation: Use titanium alloy bar;

[0008] Step 2: Hot radial forging and blanking of the bar;

[0009] Step 3: Rod and tube deep hole processing and conversion;

[0010] Step 4: core mold installation and semi-solid isothermal treatment;

[0011] Step 5: Semi-solid precision forging of the titanium alloy barrel and rifle;

[0012] Step 6: Finishing and heat treatment of titanium alloy barrel.

[0013] The present invention is also characterized in that:

[0014] Step 2 is implemented as follows:

[0015] Step 2.1, heating the titanium alloy bar obtained in step 1 to 900° C. to 950° C. and keeping the temperature for 1 hour, and then radially forging the titanium alloy bar using a radial forging process to obtain a radially forged bar;

[0016] Step 2.2: Cut the radial forged bar stock obtained in step 2.1 to obtain a deformed bar stock of a certain length for a titanium alloy barrel.

[0017] The radial cross-sectional reduction rate of the radial forged bar obtained by hot radial forging deformation in step 2.1 reaches 50% or more.

[0018] Step 3 is implemented as follows:

[0019] The titanium alloy deformed bar stock for the barrel obtained in step 2.2 is deep-hole processed to obtain the deformed tube stock for the barrel.

[0020] The inside of the deformed barrel material is provided with a barrel outer circular hole which penetrates the deformed barrel material along the axial direction, and the small end diameter end of the barrel outer circular hole is provided with a countersunk bolt through hole.

[0021] Step 4 is implemented as follows:

[0022] Step 4.1, installing a barrel core mold with a high conductivity on the distorted barrel material obtained in step 3, and fixing the distorted barrel material to the barrel core mold;

[0023] Step 4.2: Apply a 220V voltage to both ends of the barrel core mold to increase the temperature so that the interior of the deformed barrel material installed therewith is heated to the semi-solid temperature range of the titanium alloy bar material and kept at this temperature for 5 to 10 minutes to obtain a semi-solid composite barrel material.

[0024] In step 4.1, the fitting relationship between the deformed tube material for the barrel and the barrel core mold is a clearance fit greater than zero.

[0025] Step 5 is implemented as follows:

[0026] The semi-solid composite tube material obtained in step 4 is subjected to semi-solid radial forging using a radial forging process. After the semi-solid radial forging, the barrel core mold is removed to obtain a titanium alloy barrel blank.

[0027] Step 6 is implemented as follows:

[0028] The outer circle of the titanium alloy barrel blank obtained in step 5 is finely processed according to the required size of the titanium alloy barrel, and is heated to 910° C. to 940° C. and kept at this temperature for 0.5 h to 2 h, followed by solution treatment and quenching to obtain the titanium alloy barrel part.

[0029] The beneficial effects of the present invention are:

[0030] (1) The manufacturing process of the present invention combines radial forging, deep hole processing, semi-solid isothermal treatment and other processes to prepare the barrel. During the radial forging process, the blank is subjected to three-dimensional compressive stress. Therefore, the present invention uses the hot radial forging process to achieve large plastic deformation of the titanium alloy bar, which can obtain high-quality, large-scale strain energy storage, and is conducive to the subsequent semi-solid isothermal treatment to obtain a small, nearly spherical structure of the barrel.

[0031] (2) The barrel parts obtained using the manufacturing process of the present invention have a radial forged fiber structure and a semi-solid fine spherulite structure. Specifically, the inner rifle has a semi-solid fine spherulite structure, and the outer barrel has a radial forged fiber structure. The semi-solid fine spherulite structure has an isotropic characteristic and has better fatigue resistance than the forged fiber structure of the conventional barrel rifle.

[0032] (3) The manufacturing process of the present invention adopts a semi-solid radial forging integral forming process for the barrel rifle, which has the characteristics of low forming force and good performance of the formed part, and has low requirements on the tonnage of the radial forging equipment, which can reduce the production investment cost;

[0033] (4) The semi-solid billet of titanium alloy obtained by the manufacturing process of the present invention has good fluidity, so the barrel rifling obtained by the manufacturing process of the present invention is very full. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the forming and manufacturing process from titanium alloy bar to titanium alloy barrel parts in the manufacturing process of the present invention;

[0035] Figure 2 It is a schematic diagram of the rod and tube deep hole processing conversion process in the manufacturing process of the present invention;

[0036] Figure 3 It is a schematic diagram of the core mold matching installation and semi-solid isothermal treatment process in the manufacturing process of the present invention;

[0037] Figure 4 Schematic diagram of the semi-solid radial precision forging process in the manufacturing process of the present invention;

[0038] Figure 5 It is a schematic structural diagram of the barrel parts in the manufacturing process of the present invention;

[0039] Figure 6 It is a process flow chart of the manufacturing process of the present invention.

[0040] In the figure, 1. Titanium alloy bar, 2. Radial forging bar, 3. Deformed bar for barrel, 4. Deformed tube for barrel, 4-1. Outer circular hole of barrel, 4-2. Through hole for countersunk bolt, 5. Semi-solid composite tube, 5-1. Barrel mandrel, 5-2. Hexagon socket screw, 6. Barrel blank, 7. Barrel parts. DETAILED DESCRIPTION

[0041] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] The invention provides a titanium alloy barrel with integrated radial precision forging process for forming a rifled barrel. Figures 1 to 6 As shown, please follow the steps below:

[0043] Step 1. Bar preparation: Use a titanium alloy bar 1 with a diameter of 80 mm;

[0044] Step 2: Hot radial forging and blanking of bar stock:

[0045] Step 2.1, after heating the titanium alloy bar 1 obtained in step 1 to 900° C. to 950° C. and holding the temperature for 1 hour, radially forging the titanium alloy bar 1 using a radial forging process to obtain a radially forged bar 2, and ensuring that the radial cross-sectional reduction rate of the radially forged bar 2 obtained by the hot radial forging deformation reaches 50% or more;

[0046] Step 2.2: Cut the radially forged bar stock 2 obtained in step 2.1 to obtain a deformed bar stock 3 for the barrel having a length of 1200 mm;

[0047] Step 3: Deep hole processing of the rod and tube: The deformed barrel rod 3 obtained in step 2.2 is deep-hole processed using a deep hole processing process to obtain a deformed barrel tube 4. The deformed barrel tube 4 has an outer barrel hole 4-1 extending through the deformed barrel tube 4 along the axial direction and countersunk bolt through holes 4-2 distributed at the small diameter end of the outer barrel hole 4-1.

[0048] Step 4: Core mold installation and semi-solid isothermal treatment:

[0049] Step 4.1: Mounting a highly conductive barrel core mold 5-1 on the distorted barrel material 4 obtained in Step 3, with the distorted barrel material 4 and the barrel core mold 5-1 having a clearance fit greater than zero. The distorted barrel material 4 and the barrel core mold 5-1 are fixed together using an insulating hexagon socket screw 5-2.

[0050] Step 4.2: Applying a 220V voltage to both ends of the barrel core mold 5-1 to increase the temperature, heating the interior of the deformed barrel material 4 mounted therewith to the semi-solid temperature range of the titanium alloy bar 1 and maintaining the temperature for 5 to 10 minutes, thereby obtaining a semi-solid composite barrel material 5 having a wall thickness of 1 mm, a solid fraction of 90% or more, and fine, nearly spherical microstructure.

[0051] Step 5, semi-solid precision forging of barrel and rifle: The semi-solid composite tube 5 obtained in step 4 is subjected to semi-solid radial forging using a radial forging process. After the semi-solid radial forging, the barrel core mold 5-1 and the insulating hexagon socket screw 5-2 are removed to obtain a barrel blank 6 having both radially forged fibrous structure and semi-solid fine spherulite structure.

[0052] Step 6, barrel finishing and heat treatment: The outer diameter of the barrel blank 6 obtained in step 5 is finish-machined according to the required barrel dimensions, and heated to 910°C to 940°C and kept at this temperature for 0.5h to 2h before solution treatment and quenching to obtain the barrel part 7.

Claims

1. A radial precision forging manufacturing process for a titanium alloy barrel with a rifled barrel, characterized in that: Please follow the steps below to implement it: Step 1, bar preparation: Use titanium alloy bar (1); Step 2: Hot radial forging and blanking of the bar; Step 3: Rod and tube deep hole processing and conversion; Step 4: core mold installation and semi-solid isothermal treatment; Step 5: Semi-solid precision forging of the titanium alloy barrel and rifle; Step 6: Finishing and heat treatment of titanium alloy barrel; Step 2 is implemented as follows: Step 2.1, heating the titanium alloy bar (1) obtained in step 1 to 900° C. to 950° C. and keeping the temperature for 1 hour, and then radially forging the titanium alloy bar (1) using a radial forging process to obtain a radially forged bar (2); Step 2.2, cutting the radial forged bar stock (2) obtained in step 2.1 to obtain a deformed bar stock (3) of a certain length for a titanium alloy barrel; Step 3 is implemented as follows: The titanium alloy barrel deformed bar stock (3) obtained in step 2.2 is deep-hole machined to obtain the barrel deformed tube stock (4); The deformed barrel material (4) is provided with a barrel outer circular hole (4-1) penetrating the deformed barrel material (4) along the axial direction, and a countersunk bolt through hole (4-2) is provided at the small diameter end of the barrel outer circular hole (4-1); Step 4 is implemented as follows: Step 4.1, installing a barrel core mold (5-1) with a high conductivity on the distorted barrel material (4) obtained in step 3, and fixing the distorted barrel material (4) and the barrel core mold (5-1); Step 4.2: Apply 220V voltage to both ends of the barrel core mold (5-1) to increase the temperature, so that the inside of the deformed barrel material (4) installed therewith is heated to the semi-solid temperature range of the titanium alloy bar material (1) and kept at this temperature for 5 minutes to 10 minutes, thereby obtaining the semi-solid composite barrel material (5); Step 5 is implemented as follows: Performing semi-solid radial forging on the semi-solid composite tube material (5) obtained in step 4 by using a radial forging process, and removing the barrel core mold (5-1) after the semi-solid radial forging to obtain a titanium alloy barrel blank (6); Step 6 is implemented as follows: The outer diameter of the titanium alloy barrel blank (6) obtained in step 5 is finely processed according to the required size of the titanium alloy barrel, and is heated to 910°C~940°C and kept at this temperature for 0.5h~2h before solution treatment and quenching to obtain the titanium alloy barrel part (7).

2. The radial precision forging manufacturing process for a titanium alloy barrel with a rifled barrel as claimed in claim 1 is characterized in that: In step 2.1, the radial cross-sectional shrinkage of the radial forged bar (2) obtained by hot radial forging deformation reaches 50% or more.

3. The radial precision forging manufacturing process for the integrated rifled titanium alloy barrel according to claim 1 is characterized in that: In step 4.1, the fitting relationship between the deformed barrel material (4) and the barrel core mold (5-1) is a clearance fit greater than zero.

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