CN111266462B

CN111266462B - Shape correction die and method for complex titanium alloy machining part

Info

Publication number: CN111266462B
Application number: CN202010179596.1A
Authority: CN
Inventors: 朱丽; 王月林; 王珏
Original assignee: Shenyang Aircraft Industry Group Co Ltd
Current assignee: Shenyang Aircraft Industry Group Co Ltd
Priority date: 2020-03-16
Filing date: 2020-03-16
Publication date: 2022-02-01
Anticipated expiration: 2040-03-16
Also published as: CN111266462A

Abstract

The invention belongs to the technical field of plastic processing technology, and particularly relates to a shape correcting die and method for a complex titanium alloy machining part. The shape correcting die for the complex titanium alloy machining part comprises an upper die, a middle die, a lower die and a side pressing block, wherein the upper die and the middle die are positioned on the upper half part of the shape correcting die, and the lower die and the side pressing block are positioned on the lower half part of the shape correcting die; the upper die is tightly coupled with the lower die sliding surface of the lower die by the upper die sliding surface and slides into the lower die, and the side pressure blocks are positioned at the inner side of the lower die and used for accurately fitting and extruding the side curved surface of the part to position the part; all the plane parts of the upper die and the lower die, which are contacted with the bosses, adopt threaded connection inserts. According to the shape correction die and the method for the complex titanium alloy machined part, provided by the invention, the shape correction die is used for carrying out thermal shape correction on the machined part under a heat treatment standard system, so that the heat treatment and the shape correction of the part are completed under a one-time heating condition, and the shape precision of the complex machined part is greatly improved.

Description

Shape correction die and method for complex titanium alloy machining part

Technical Field

The invention belongs to the technical field of plastic processing technology, and particularly relates to a shape correcting die and method for a complex titanium alloy machining part.

Background

The titanium alloy numerical control machining part (see figure 1) is formed by milling a forging blank, the inner stress of the forging is released in the machining process, so that the precision of a plurality of lug plates after the part is machined is insufficient, and a web plate and a stud are distorted and deformed, while the traditional heat treatment mode after the part is machined only plays a role in eliminating the inner stress, the existing shape is not compensated, the subsequent welding forming with other parts is adversely affected, the precision of a welding assembly is difficult to meet the technical requirement, the qualification rate and the cost are wasted, and the manufacturing period is prolonged. Thus, the sizing after part machining has an extremely important effect on the subsequent welding process and the overall quality of the assembly.

Disclosure of Invention

The invention aims to provide a shape correction die and a shape correction method for a complex titanium alloy machining part, which aim to solve the problems in the prior art.

The technical scheme of the invention is as follows:

a correction die for complex titanium alloy machine-added parts comprises an upper die 1-1 and a middle die 1-2 which are positioned on the upper half part of the correction die, a lower die 1-3 and a side pressing block 1-4 which are positioned on the lower half part of the correction die; the upper die 1-1 is tightly coupled and slid into the lower die 1-3 by virtue of the upper die sliding fit surface 4 and the lower die sliding fit surface 5 of the lower die 1-3, and is used for simultaneously extruding the correction stud 103 and the lug boss 2 on the side surface of the lug 101 with the middle die 1-2 limited by the lower die 1-3 under the support of lateral force provided by the lower die sliding fit surface 5 of the lower die 1-3, and the upper die 1-1 and the middle die 1-2 are jointly pressed on the flat boss 3 of the part web plate 102 to play a correction role; the upper die 1-1 also comprises a temperature measuring hole 6 for monitoring the temperature of the upper die 1-1 when the temperature is increased or decreased; and guide plates 7 arranged at two ends of the upper die 1-1 are used for controlling the accuracy of die assembly positioning with the lower die 1-3.

The lower die 1-3 comprises a temperature measuring hole 6 for monitoring the temperature of the lower die 1-3 when the temperature is increased or decreased; the side pressing blocks 1-4 are positioned on the inner side of the lower die 1-3 and used for accurately fitting and extruding the side curved surfaces of the parts to position the parts; all the plane parts of the upper die 1-1 and the lower die 1-3, which are contacted with the bosses, adopt the threaded inserts 8, so that the profile precision of the parts of the die, which play a role in shape correction, is ensured, and the errors generated by the processing of the whole die are reduced.

The invention also provides a method for correcting the shape of the complex titanium alloy machining part, which comprises the following steps:

step 1, adding a plane machining process boss 1 at each of two ends of a theoretical digital model of a part for determining a reference of part machining; the side wall of the lug 101 of the part is provided with a lug boss 2 for increasing the plane, ribs on two sides of a web plate 102 are provided with flat bosses 3, and the flat bosses 3 are used for correcting the deformed part to the theoretical position under the action of pressure when the part is clamped in a shape correcting die; the thickness of each boss is as small as possible, so that the shape of the part is not influenced when the boss is removed after shape correction. And processing the part according to the designed process model.

Step 2, in an isothermal thermoforming press, a lower die 1-3 is placed on a lower platform of the equipment, a part is placed on the lower die 1-3, a side pressing block 1-4 is placed in a gap between the lower die 1-3 and the part, a middle die 1-2 is placed on the part, an upper die 1-1 and the lower die 1-3 are closely attached in a sliding manner, and an upper platform moves downwards and is closely attached to the upper surface of the upper die 1-1; and (3) raising the temperature of the isothermal thermoforming machine to the annealing heat treatment temperature of the part material, pressurizing by using a press, preserving heat and pressure, fully creeping the material of the part under the pressure, releasing internal stress, converting elastic deformation into plastic deformation, and correcting the shapes of the lug 101, the web 102 and the stud 103 of the part to make the shapes conform to the designed theoretical digifax.

And 3, after finishing the shape correction, milling and removing each boss to obtain the accurate part of the process.

The invention has the advantages that:

according to the shape correcting die and the method for the complex titanium alloy machined part, provided by the invention, the shape correcting die is used for carrying out thermal shape correction on the machined part under a heat treatment standard system, so that the heat treatment and the shape correction of the part are completed under a one-time heating condition, the shape precision of the complex machined part is greatly improved, a high-quality part is provided for the subsequent welding process with other parts, the quality of a final welding assembly is ensured, the integral qualification rate of the part is improved, and expensive raw materials and manufacturing cost are saved.

Drawings

FIG. 1 is a schematic view of a titanium alloy numerical control machining part.

Fig. 2 and 3 are schematic views of the titanium alloy numerical control machined part with a process boss added.

Fig. 4 is a schematic structural diagram of an upper half portion of a sizing die in a sizing die for a complex titanium alloy machined part provided in an embodiment of the present invention.

FIG. 5 is a schematic diagram of a lower half structure of a sizing die in a sizing die for a complex titanium alloy machined part according to an embodiment of the present invention.

FIG. 6 is a schematic diagram of a calibration mold for a complex titanium alloy machined part according to an embodiment of the present invention.

In the figure: 101 a tab; 102 a web; 103 standing ribs; 1-1, molding on a die; 1-2 middle mould; 1-3 lower dies; 1-4 lateral pressing blocks; 1, processing a technical boss by a plane machine; 2 lug boss; 3, flattening the boss; 4, sliding and jointing the upper die; 5, sliding and jointing the lower die; 6 temperature measuring holes; 7 a guide plate; 8, screwing the insert.

Detailed Description

The following further describes a specific embodiment of the present invention with reference to the drawings and technical solutions.

It is to be understood that the appended drawings are not to scale, but are merely drawn with appropriate simplifications to illustrate various features of the basic principles of the invention. Specific design features of the invention disclosed herein, including, for example, specific dimensions, orientations, locations, and configurations, will be determined in part by the particular intended application and use environment.

In the several figures of the drawings, identical or equivalent components (elements) are referenced with the same reference numerals.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Referring to fig. 1 to 6, in the present embodiment, the sizing die for the complex titanium alloy machine-added part includes an upper die 1-1 and a middle die 1-2 located on an upper half portion of the sizing die, a lower die 1-3 and a side pressing block 1-4 located on a lower half portion of the sizing die; the upper die 1-1 is tightly coupled and slid into the lower die 1-3 by virtue of the upper die sliding fit surface 4 and the lower die sliding fit surface 5 of the lower die 1-3, and is used for simultaneously extruding the correction stud 103 and the lug boss 2 on the side surface of the lug 101 with the middle die 1-2 limited by the lower die 1-3 under the support of lateral force provided by the lower die sliding fit surface 5 of the lower die 1-3, and the upper die 1-1 and the middle die 1-2 are jointly pressed on the flat boss 3 of the part web plate 102 to play a correction role; the upper die 1-1 also comprises a temperature measuring hole 6 for monitoring the temperature of the upper die 1-1 when the temperature is increased or decreased; and guide plates 7 arranged at two ends of the upper die 1-1 are used for controlling the accuracy of die assembly positioning with the lower die 1-3.

The shape correcting method of the complex titanium alloy machining part comprises the following steps:

step 1, designing and adding a plane machining process boss 1 at each of two ends of a theoretical digital model of a part for determining a reference of part machining; the lug boss 2 of an additional plane and the flat boss 3 on ribs at two sides of the web plate 102 are designed on the lug 101 of the part, and the flat boss 3 is used for correcting the deformed part to the theoretical position under the action of pressure when the part is clamped in a shape correcting die; the thickness of each boss is as small as possible, so that the shape of the part is not influenced when the boss is removed after shape correction. And processing the part according to the designed process model.

Step 2, as shown in a schematic diagram of a combined die of FIG. 5, in an isothermal thermoforming press, a lower die 1-3 is placed on a lower platform of equipment, a part is placed on the lower die 1-3, a side pressing block 1-4 is placed in a gap between the lower die 1-3 and the part, a middle die 1-2 is placed on the part, an upper die 1-1 and the lower die 1-3 are closely attached in a sliding manner, and an upper platform moves downwards and is closely attached to the upper surface of the upper die 1-1; and (3) raising the temperature of the isothermal thermoforming machine to the annealing heat treatment temperature of the part material, pressurizing by using a press, preserving heat and pressure, fully creeping the material of the part under the pressure, releasing internal stress, converting elastic deformation into plastic deformation, and correcting the shapes of the lug 101, the web 102 and the stud 103 of the part to make the shapes conform to the designed theoretical digifax.

The above description of exemplary embodiments has been presented only to illustrate the technical solution of the invention and is not intended to be exhaustive or to limit the invention to the precise form described. Obviously, many modifications and variations are possible in light of the above teaching to those skilled in the art. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to thereby enable others skilled in the art to understand, implement and utilize the invention in various exemplary embodiments and with various alternatives and modifications. It is intended that the scope of the invention be defined by the following claims and their equivalents.

Claims

1. The shape correction method of the complex titanium alloy machine-added part is characterized in that a shape correction die of the complex titanium alloy machine-added part is used in the shape correction method of the complex titanium alloy machine-added part;

the correction die for the complex titanium alloy machine-added part comprises an upper die (1-1) and a middle die (1-2) which are positioned on the upper half part of the correction die, and a lower die (1-3) and a side pressing block (1-4) which are positioned on the lower half part of the correction die; the upper die (1-1) is tightly coupled with the lower die sliding face (5) of the lower die (1-3) by virtue of the upper die sliding face (4) and is tightly slid into the lower die (1-3), under the support of lateral force provided by the lower die sliding face (5) of the lower die (1-3), the upper die (1-1) and the middle die (1-2) limited by the lower die (1-3) are used for simultaneously extruding the correction vertical rib (103) and the lug boss (2) on the side face of the lug (101), and the upper die (1-1) and the middle die (1-2) are jointly pressed on the flat boss (3) of the part web plate (102) to play a correcting role; the upper die (1-1) further comprises a temperature measuring hole (6) for monitoring the temperature of the upper die (1-1) during temperature rise and fall; guide plates (7) arranged at two ends of the upper die (1-1) are used for controlling the accuracy of die assembly positioning with the lower die (1-3);

the lower die (1-3) comprises a temperature measuring hole (6) for monitoring the temperature of the lower die (1-3) during temperature rise and fall; the side pressing block (1-4) is positioned on the inner side of the lower die (1-3) and used for accurately fitting and extruding the side curved surface of the part to position the part; all the plane parts of the upper die (1-1) and the lower die (1-3) which are contacted with the bosses are provided with the threaded inserts (8), so that the profile precision of the parts of the die for shape correction is ensured, and the error generated by the processing of the integral die is reduced;

step 1, adding a plane machining process boss (1) at each of two ends of a theoretical digital model of a part for determining a reference of part machining; the lug boss (2) for increasing the plane is arranged on the side wall of the lug (101) of the part, the flat bosses (3) are arranged on ribs on two side surfaces of the web plate (102), and the flat bosses (3) are used for correcting the deformed part to the theoretical position under the action of pressure when the part is clamped in a sizing die; processing parts;

step 2, in an isothermal thermoforming press, placing a lower die (1-3) on a lower platform of the equipment, placing a part on the lower die (1-3), placing a side pressing block (1-4) in a gap between the lower die (1-3) and the part, placing a middle die (1-2) on the part, enabling an upper die (1-1) and the lower die (1-3) to be in sliding fit and close contact, and enabling an upper platform to move downwards and close contact with the upper surface of the upper die (1-1); raising the temperature of an isothermal thermoforming machine to the annealing heat treatment temperature of the part material, pressurizing by a press, preserving heat and pressure, fully creeping the material of the part under the pressure, releasing internal stress, converting elastic deformation into plastic deformation, and correcting the shapes of a lug (101), a web (102) and a stud (103) of the part to make the shapes conform to a designed theoretical digifax;