High positioning precision implementation process for pipe bulging parts

Abstract

The invention relates to the technical field of pipe bulging part positioning, and discloses a high positioning precision implementation process for a pipe bulging part, which mainly comprises the following steps: step 1, pipe manufacturing, step 2, pipe bending, step 3, preforming: performing preforming treatment on a metal pipe blank after pipe bending to ensure that the metal pipe blank meets the size and shape requirements before thermal expansion; 4, heating is conducted, specifically, the preformed pipe blank is heated to the high temperature of 900 DEG C or above; 5, thermal expansion is conducted, specifically, by means of air pressure or mechanical bulging, a punch is driven by an oil cylinder at the end of the part, local holes are punctured, bulging machining is conducted on the heated pipe blank, and the final shape of the pipe beam type part is obtained; and 6, cutting is conducted, specifically, the pipe beam subjected to thermal expansion is cut, waste materials at the holes and the ends are removed, a finished product meeting the requirement is obtained, during cutting, the puncturing holes in the step 5 serve as the positioning reference of the cutting brace, the part positioning precision is high, and the size precision of the cut part can be remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of positioning of tube-shaped bulging parts, and particularly to a process for achieving high positioning accuracy for tube-shaped bulging parts. Background Art

[0002] Tube-shaped pneumatic bulging parts generally require a laser cutting process to cut out the part boundary and various shaped holes. The positioning of the tube on the laser cutting jig generally uses local surface positioning. The disadvantage of surface positioning is low positioning accuracy, and it is easy to generate fluctuations in the repeated positioning of parts, which directly affects the dimensional accuracy and dimensional consistency of the product.

[0003] To solve this problem, the present invention has studied a process method of punching process notches in the process supplementary areas at both ends of the tube, and using the process notches to achieve precise positioning of the parts on the laser cutting jig.

[0004] Therefore, we propose a process for achieving high positioning accuracy for tube-shaped bulging parts. Summary of the Invention

[0005] The present invention mainly solves the technical problems existing in the above-mentioned prior art, and provides a process for achieving high positioning accuracy for tube-shaped bulging parts.

[0006] To achieve the above object, the present invention adopts the following technical solutions. A process for achieving high positioning accuracy for tube-shaped bulging parts mainly includes the following steps: Step 1: Tube manufacturing: Process the metal material into the required straight tube blank. Step 2: Tube bending: Bend the straight tube blank to make it reach the predetermined shape. Step 3: Pre-forming: Perform pre-forming treatment on the bent metal tube blank to ensure that it meets the dimensional and shape requirements before thermal expansion. Step 4: Heating: Heat the pre-formed tube blank to a high temperature above 900 degrees Celsius. Step 5: Thermal expansion: By means of pneumatic or mechanical bulging, drive the punch through the oil cylinder at the end of the part to pierce out local holes, and perform bulging processing on the heated tube blank to obtain the final shape of the tube beam part. A punch for punching process notches is installed on the upper die of the pneumatic bulging die. The punch can move up and down relative to the upper die insert under the action of the high-pressure oil cylinder. The sealing push head structure is divided into two parts, the front end is designed with a concave die edge for punching process notches, and the back is designed with a sealing inclined surface. The sealing push head has both functions of punching process notches and sealing. The sealing push head is installed on the mounting plate to form a sealing push head assembly. The sealing push head assembly is driven by a high-pressure oil cylinder. The sealing push head assembly has three working positions: 1) retracted position, 2) sealing position, 3) punching process notch position. Step 6: Cutting: Cut the tube beam after thermal expansion, remove the waste at the holes and ends to obtain finished products that meet the requirements. When cutting, use the puncture holes in Step 5 as the positioning reference for the cutting fixture. The positioning accuracy of the parts is relatively high, which can significantly improve the dimensional accuracy of the parts after cutting.

[0007] Preferably, the material of the metal straight tube blank is alloy steel.

[0008] Preferably, the heating step is carried out by induction heating or in-furnace heating.

[0009] Preferably, the thermal expansion step is completed by an internal pneumatic bulging device or an external mechanical bulging device.

[0010] Preferably, the cutting step is completed using a laser cutting or plasma cutting device.

[0011] Beneficial effects The present invention provides a process for achieving high positioning accuracy for tube bulging parts, which has the following beneficial effects: For the process for achieving high positioning accuracy for tube bulging parts, during thermal expansion, the punch is driven by an oil cylinder to puncture local holes at the end, and such holes are used for positioning. The accuracy is relatively high, which can significantly improve the dimensional accuracy of the parts after cutting. Description of the drawings

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary. For those of ordinary skill in the art, without creative efforts, other implementation drawings can also be obtained based on the provided drawings.

[0013] The structures, ratios, sizes, etc. shown in this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they do not have substantial technical significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present invention.

[0014] Figure 1 It is the overall process flow view of the present invention; Figure 2 It is the schematic diagram of State 1 of the present invention; Figure 3 It is the schematic diagram of State 2 of the present invention; Figure 4 It is the schematic diagram of State 3 of the present invention. Detailed implementation mode

[0015] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0016] Embodiment: A process for achieving high positioning accuracy for tube expansion parts, the main steps are as follows: Step 1: Tube manufacturing: Process metal materials into the required straight tube blanks; Step 2: Tube bending: Bend the straight tube blanks to make them reach the predetermined shape; Step 3: Preforming: Perform preforming treatment on the bent metal tube blanks to ensure that they meet the dimensional and shape requirements before thermal expansion; Step 4: Heating: Heat the preformed tube blanks to a high temperature above 900 degrees Celsius; Step 5: Thermal expansion: Through pneumatic or mechanical expansion means, drive the punch at the end of the part through an oil cylinder to pierce local holes, and perform expansion processing on the heated tube blanks to obtain the final shape of the tube beam parts. There is a punch for punching process notches installed on the upper die of the gas expansion forming die. This punch can move up and down relative to the upper die insert under the action of a high-pressure oil cylinder. The sealing push head structure is divided into front and rear parts. The front end is designed with a die edge for punching process notches, and the rear is designed with a sealing slope. The sealing push head has both the functions of punching process notches and sealing. The sealing push head is installed on the mounting plate to form a sealing push head assembly. The sealing push head assembly is driven by a high-pressure oil cylinder. The sealing push head assembly has three working positions: 1) Retracted position, 2) Sealing position, 3) Punching process notch position; The working process is as follows: 1) The heated tube beam is placed in the lower die cavity of the gas expansion forming die. The upper die assembly moves downward driven by the press slider, and the upper and lower dies are closed. At this time, the sealing push head assembly is in the retracted position, and the punch for punching process notches is in the retracted position, as shown in state 1 Figure 2 as shown.

[0017] 2) The sealing push head assembly moves leftward under the action of the high-pressure oil cylinder and presses into the inner cavity of the tube beam. Plastic deformation occurs at the end of the tube beam under the action of the sealing push head and the upper and lower die inserts, realizing the sealing of the tube cavity. At this time, the punch for punching process notches is still in the retracted position, as shown in state 2 Figure 3 as shown.

[0018] 3) There is a high-pressure air nozzle on the sealing push head, and high-pressure gas is filled into the tube cavity to complete gas expansion forming.

[0019] 4) After hydroforming is completed, the sealing push head moves to the right by one stroke under the action of the oil cylinder. The limit and precise positioning devices installed on the sealing push head assembly and the lower die base ensure that the sealing push head is in the punching position. The punch edge moves downward, and punching is completed under the action of the upper and lower die edges, as shown in State 3. Figure 4 as shown.

[0020] 5) After the process notch punching is completed, the punch moves upward and retracts to the initial position. At this time, the mold is still in the closed state.

[0021] 6) During the above working process, the cooling water channels in the mold inserts continuously cool the part, and in-mold quenching of the part is completed.

[0022] 7) The slider returns, the upper die assembly moves upward, the mold opens, and the part is taken out. Step Six: Cutting: Cut the tube beam after thermal expansion, remove the waste at the holes and ends to obtain a finished product that meets the requirements. During cutting, use the piercing hole in Step Five as the positioning reference for the cutting fixture. The positioning accuracy of the part is relatively high, which can significantly improve the dimensional accuracy of the part after cutting.

[0023] Further, the material of the metal straight tube blank is alloy steel.

[0024] Further, the heating step is carried out by induction heating or in-furnace heating.

[0025] Further, the thermal expansion step is completed by an internal pneumatic expansion device or an external mechanical expansion device.

[0026] Further, the cutting step is completed using a laser cutting or plasma cutting device.

[0027] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A process for achieving high positioning accuracy for tube bulging parts, characterized in that, The main steps are as follows: Step 1: Pipe manufacturing: Processing the metal material into the required straight pipe blank; Step 2: Pipe bending: Bending the straight pipe blank to make it reach the predetermined shape; Step 3: Preforming: Conducting preforming treatment on the bent metal pipe blank to ensure it meets the dimensional and shape requirements before thermal expansion; Step 4: Heating: Heating the preformed pipe blank to a high temperature above 900 degrees Celsius; Step 5: Thermal expansion: By means of pneumatic or mechanical bulging, driving the punch through the oil cylinder at the end of the part to pierce local holes, and conducting bulging processing on the heated pipe blank to obtain the final shape of the pipe beam part. A punch for punching the process notch is installed on the upper die of the pneumatic bulging die. The punch can move up and down relative to the upper die insert under the action of the high-pressure oil cylinder. The sealing push head structure is divided into two parts, the front end is designed with a concave die edge for punching the process notch, and the back is designed with a sealing inclined surface. The sealing push head has both functions of punching the process notch and sealing. The sealing push head is installed on the mounting plate to form a sealing push head assembly. The sealing push head assembly is driven by a high-pressure oil cylinder. The sealing push head assembly has three working positions: 1) Retracted position, 2) Sealing position, 3) Punching process notch position; Step 6: Cutting: Cutting the pipe beam after thermal expansion, removing the holes and the waste at the ends to obtain the finished product that meets the requirements. During cutting, using the pierced hole in Step 5 as the positioning reference for the cutting fixture, the positioning accuracy of the part is relatively high, which can significantly improve the dimensional accuracy of the part after cutting.

2. A process for achieving high positioning accuracy for tube bulging parts according to claim 1, characterized in that, The material of the metal straight pipe blank is alloy steel.

3. A process for achieving high positioning accuracy for tube-shaped bulging parts according to claim 1, characterized in that The heating step is carried out by induction heating or in-furnace heating.

4. A process for achieving high positioning accuracy for tube-shaped bulging parts according to claim 1, characterized in that The thermal expansion step is completed by an internal pneumatic bulging device or an external mechanical bulging device.

5. A process for achieving high positioning accuracy for tube-shaped bulging parts according to claim 1, characterized in that, The cutting step is completed using a laser cutting or plasma cutting device.

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