CN218776133U

CN218776133U - Milling fixture for special-shaped short pipe

Info

Publication number: CN218776133U
Application number: CN202223108639.0U
Authority: CN
Inventors: 付代国; 吴祖权; 高红; 王欢; 王利江; 龙飞
Original assignee: Guizhou Hangfei Precision Manufacturing Co ltd
Current assignee: Guizhou Hangfei Precision Manufacturing Co ltd
Priority date: 2022-11-22
Filing date: 2022-11-22
Publication date: 2023-03-31
Anticipated expiration: 2032-11-22

Abstract

The utility model relates to an aerospace's dysmorphism thin wall class parts machining technical field specifically discloses a dysmorphism nozzle stub milling fixture, including the base, the middle part of base is equipped with the first spacing groove that can hold blank, and the terminal surface of base is equipped with the clamp plate that can wrap up blank periphery wall, and the middle part of clamp plate is equipped with the first screw that runs through in the base, and the both sides that first spacing groove is close to the clamp plate are equipped with the cushion cap, and the middle part is equipped with the second screw behind the base. The method aims to mainly solve the problems that (1) the thickness of a pipe wall of a blank raw material after the blank raw material is processed into a pipeline is only 2-5mm, but the pipe wall of the blank raw material is slowly thinned in the process of forming the pipeline, the resultant force of a clamp is not changed, and the pressure resistance of a pipe fitting is reduced until the resultant force of the clamp cannot be supported, so that parts can be deformed; (2) The need for repeated removal, installation and tool setting for each machining operation can reduce machining efficiency and dimensional accuracy.

Description

Milling fixture for special-shaped short pipe

Technical Field

The utility model relates to an aerospace's special-shaped thin wall class parts machining technical field, in particular to special-shaped nozzle stub milling fixture.

Background

In the field of aerospace, special-shaped thin-wall pipe joint products are widely applied and mainly used at the position of shunting of an oil circuit of an aero-engine and connected to the oil circuit of the aero-engine in a welding mode, and meanwhile, in order to fully ensure the smoothness and output of the oil circuit of the aero-engine, the special-shaped thin-wall pipe joint product has high requirements on the dimensional accuracy from the outer wall of a part to be machined to the circle center and has strict requirements on the sealing property when the special-shaped thin-wall pipe joint product is machined.

The traditional processing method of the special-shaped thin-wall pipe joint is to perform milling processing by positioning and clamping a blank, a clamp is designed and pressed on a reference surface after milling processing to perform vehicle processing, although the thickness of the pipe wall of the blank raw material is only about 2-5mm after the blank raw material is processed into a hollow pipeline, the pipe wall of the blank raw material is slowly thinned in the process of forming the pipeline and the resultant force of the clamp is unchanged, the clamp continuously applies resultant force to the pipeline in the processing process, the pipe is gradually contracted inwards under the condition that the resultant force is unchanged, so that the thinning and pressure resistance of the pipe is gradually reduced until the resultant force which cannot support the clamp can cause the deformation of parts, and about 10 percent of parts are scrapped in each batch of production; in addition, the blank raw materials are milled and processed firstly in each processing of the special-shaped pipeline, then the special-shaped pipeline is disassembled and processed in a driving mode in the installation mode, the repeated disassembly and installation result in more processing steps, the processing efficiency is low, and in the process of repeated disassembly and installation, due to the fact that errors of repeated tool setting occur, deviation of the product size can occur, the size precision of the product is reduced, and the rate of finished products is influenced.

Therefore, in order to solve the above problems, it is important to design a jig that can ensure dimensional accuracy and high machining efficiency.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the utility model solves the technical problems that (1) the thickness of the tube wall of the blank raw material is only about 2-5mm after the blank raw material is processed into a hollow tube, but the tube wall of the blank raw material is slowly thinned in the process of forming the tube, the resultant force of the clamp is not changed, and the tube can be gradually shrunk inwards under the condition of the unchanged resultant force, so that the thinning and pressure-resistant capacity of the tube is gradually reduced until the resultant force of the clamp can not be supported, the part deformation can be caused, and further, about 10 percent of parts can be scrapped in each batch of production; (2) The blank raw materials are milled firstly in each processing of the special-shaped pipeline, then the blank raw materials are disassembled and then are installed for machining, and the machining efficiency and the precision of the size can be reduced by repeated disassembling, installing and tool setting.

In order to solve the above problem, the utility model discloses the technical scheme who adopts is: the utility model provides a dysmorphism nozzle stub milling fixture, includes the base, and the middle part of base is equipped with the first spacing groove that can hold blank, and the terminal surface of base is equipped with the clamp plate that can wrap up the blank periphery wall, and the middle part of clamp plate is equipped with the first screw that runs through in the base, and the both sides that first spacing groove is close to the clamp plate are equipped with the cushion cap, and the dead back middle part of base is equipped with the second screw.

The working principle of the scheme is as follows:

install whole pedestal on the vice of lathe, then to the analysis of part blank, part blank arc surface is regular relatively under the general condition, the staff can be directly place the part of treating processing in first spacing groove, make the steady stand of part of treating processing in first spacing groove through the cushion cap, then the adjustment clamp plate position, make the arc section of clamp plate with treat the part interlock of processing, the upper end of clamp plate compresses tightly the part of treating processing simultaneously, then screw first screw and make the clamp plate compress tightly the plane of blank arc section and press from both sides the part tightly, for eliminating the clearance of the rear end arc section of treating the part of processing and base, support tightly through the second screw and treat the processing part, so, treat all by the dead fixed of card completely all around of processing part, it can directly to process.

The beneficial effect that this scheme produced is:

1. after placing the location with the blank pipe fitting and accomplishing, fix the clamp plate at initial position and angle through the second screw, avoid appearing rotating and removing the phenomenon in the course of working, so even maintain same clamping-force, also can not appear because of the inside clamping-force that leads to unable resistance anchor clamps of hollowing gradually of blank pipe fitting to the problem of the deformation of contracting in. After fixing the second screw simultaneously, also prevent that the part processing atress direction from appearing the not hard up condition of part with the tight direction of clamp when milling the excircle, whole process is fixed through the mode that closely agrees with between the four sides of waiting to process the part and the clamp structure.

2. The wall thickness range of the pipe fitting is as follows: 2-5mm, the rejection rate in the existing factory processing process is 10%, the problem that the blank pipe fittings are deformed due to clamping force can be effectively avoided through the technical scheme, and the yield is increased by 10%; meanwhile, qualified products in the existing production process are not deformed, but are continuously extruded by the clamp, so that the internal crystal lattices of the products are distorted, and broken crystals are generated, and once the qualified products continue to bear the extrusion force, the extrusion force can be quickly deformed, blank pipe fittings produced by the clamp are not continuously extruded by the transition of the clamp, so that the crystal lattices are regular and have no broken crystals, the quick deformation can be avoided, and the service life of the products is prolonged.

3. Through with base direct mount back on the vice, need not dismantle the change once more, it needs man-hour to have the part, it waits to process the part directly to change in first spacing groove, then repeat above-mentioned operation and can once only process the completion, effectual solved every time all can mill the processing to the blank raw materials earlier to the processing of special-shaped pipeline, then dismantle and get off and carry out vehicle machining in the installation, demolish repeatedly, the problem of the precision of installation and tool setting can reduce machining efficiency and size has reduced the dismantlement, installation and tool setting number of times, the size precision of machining efficiency and processing part has been improved.

Further, the bottom of base is equipped with the second spacing groove, can further ensure the fixed stability of base and vice through the second spacing groove.

Furthermore, fillets with the radius of 10-20mm are formed in the two sides, close to the pressing plate, of the first limiting groove in a chamfering mode, and the fitting degree of the first limiting groove and the part to be machined is higher.

Further, the bearing platforms are symmetrically distributed along the central axis of the first limiting groove, and the plane of the bearing platform bearing the arc section of the blank on the two sides can effectively ensure that the part to be processed vertically stands in the first limiting groove.

Furthermore, fillets with the radius of 30-40mm are formed in two sides of the long edge of the pressing plate in an inverted mode, and the pressing plate is higher in fit with the part to be machined in an inverted mode.

Furthermore, the pressing plates are symmetrically distributed along the central axis of the first limiting groove, and the planes of the arc sections of the blanks are compressed by the pressing plates on the two sides, so that the stability of parts to be machined can be effectively improved.

Furthermore, clamp plate, first screw and base form revolution mechanic, and the clamp plate is 0-360 around first screw rotation angle, because the clamp plate both sides all have the fillet, make the staff can be quick compress tightly the planar coincidence that makes clamp plate and waiting to process the part that the blank circular arc section can also be quick when the clamp plate through the mode of rotatable clamp plate, improve work efficiency.

Drawings

Fig. 1 is a schematic perspective view of the milling fixture for the special-shaped short pipe of the present invention;

FIG. 2 is a front view of the milling fixture for the special-shaped short pipe of the present invention;

fig. 3 is a bottom view of the milling fixture for the special-shaped short pipe of the present invention.

Detailed Description

The following is further detailed by way of specific embodiments:

reference numerals in the drawings of the specification include:

the base 1, first spacing groove 101, cushion cap 102, second spacing groove 103, clamp plate 2, first screw 3, second screw 4.

Example 1:

as shown in the attached figures 1 and 2, the direction shown in the attached figure 2 is taken as a reference direction, the base 1 is cuboid, the whole base 1 is 130mm long, 70mm wide and 70mm high, the middle sunken part is a first limiting groove 101, the bottom edges of the left side and the right side of the first limiting groove 101 are circular arc-shaped, the circular arc radius is 10mm, the base is convenient to be matched with a part to be processed, the left side and the right side of the first limiting groove 101 are bearing platforms 102 which are symmetrical and parallel to each other and have the same height, the height of the bearing platform 102 is 1/2 of that of the first limiting groove 101, the part to be processed is convenient to keep a vertical standing state in the first limiting groove 101 through the bearing platform 102, the front surface of the base 1 is 2 pressing plates 2 which are symmetrical left and right, and the pressing plates 2 are cuboid, the both sides of clamp plate 2 are circular-arc of indent, the circular arc radius is 30mm, be convenient for improve with the degree of agreeing with of waiting to process the part, the center of clamp plate 2 is first screw 3, first screw 3 is phi 15 mm's hexagon socket head cap screw, first screw 3 runs through clamp plate 2 and base 1 threaded connection, put into in first spacing groove 101 and wait to process the part after, the position of clamp plate 2 has been adjusted, screw first screw 3 alright compress tightly it after that, base 1's dead astern mid-mounting has 1 second screw 4, second screw 4 is phi 15 mm's hexagon socket head cap screw, run through base 1 through second screw 4 and supply the clearance of waiting to process between part and the first spacing groove 101, thereby improve the stability of waiting to process the part.

Example 2:

as shown in fig. 3, two second limiting grooves 103 are designed at the bottom of the base 1, the second limiting grooves 103 are groove-shaped, the size of the second limiting grooves 103 is matched with the size of a fixing device on a lathe, and after the second limiting grooves 103 are inserted into the fixing device on the lathe, bolts are inserted into two sides of the base 1, so that the fixing device and the base are tightly anchored together, and the base 1 can be fixed as well.

The specific implementation process is as follows:

firstly, the whole base 1 is installed on a vice of a lathe, wherein the mounting mode includes two mounting modes, firstly, the base 1 is directly clamped by the vice, secondly, a fixing device on the lathe is inserted into a second limiting groove 103, the base 1 and the fixing device are firmly anchored through a bolt, secondly, a part blank is analyzed, the arc surface of the part blank is relatively regular under general conditions, a worker can directly place a part to be processed in a first limiting groove 101, the part to be processed stably stands in the first limiting groove 101 through a bearing platform 102, then the pressing plate 2 is rotated, the arc section of the pressing plate 2 is meshed with the part to be processed, meanwhile, the part to be processed is pressed by the upper end of the pressing plate 2, then the first screw 3 is screwed, the pressing plate 2 presses the plane of the arc section of the blank to clamp the part, finally, in order to eliminate the gap between the rear end arc section of the part to be processed and the base, the second screw 4 penetrates through the base 1 to supplement the gap between the part to be processed and the first limiting groove 101, at the front, the part to be processed is completely fixed in the front, the rear, the left and the right, and the part to be processed can be milled and fixed.

The above description is only an example of the present invention, and the common general knowledge of the known specific structures and characteristics of the embodiments is not described herein. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be defined by the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.

Claims

1. The utility model provides a dysmorphism nozzle stub milling fixture, includes base (1), its characterized in that: the middle part of base (1) is equipped with first spacing groove (101) that can hold blank, the terminal surface of base (1) is equipped with clamp plate (2) that can wrap up the blank periphery wall, the middle part of clamp plate (2) is equipped with first screw (3) that run through in base (1), the both sides that first spacing groove (101) are close to clamp plate (2) are equipped with cushion cap (102), the dead back middle part of base (1) is equipped with second screw (4).

2. The milling fixture for the special-shaped short pipe according to claim 1, wherein: the bottom of base (1) is equipped with second spacing groove (103).

3. The milling fixture for the special-shaped short pipe according to claim 1, characterized in that: and fillets with the radius of 10-20mm are formed on two sides of the first limiting groove (101) close to the pressing plate (2).

4. The milling fixture for the special-shaped short pipe according to claim 1, characterized in that: the bearing platforms (102) are symmetrically distributed along the central axis of the first limiting groove (101).

5. The milling fixture for the special-shaped short pipe according to claim 1, wherein: fillets with the radius of 30-40mm are formed on two sides of the long edge of the pressing plate (2).

6. The milling fixture for the special-shaped short pipe according to claim 5, wherein: the pressing plate (2) is symmetrically distributed along the central axis of the first limiting groove (101).

7. The milling fixture for the special-shaped short pipe according to claim 6, wherein: the pressing plate (2), the first screws (3) and the base (1) form a rotating structure, and the rotating angle of the pressing plate (2) around the first screws (3) is 0-360 degrees.