CN113399947B - Pulley bracket machining clamp and machining method - Google Patents
Pulley bracket machining clamp and machining method Download PDFInfo
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- CN113399947B CN113399947B CN202110747690.7A CN202110747690A CN113399947B CN 113399947 B CN113399947 B CN 113399947B CN 202110747690 A CN202110747690 A CN 202110747690A CN 113399947 B CN113399947 B CN 113399947B
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- machining
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- pulley
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/06—Work-clamping means
Abstract
The invention discloses a pulley bracket machining clamp and a machining method. During machining, firstly, two reference surfaces are cut on line on a pulley support casting blank, then a clamp is adopted to clamp the pulley support, the left end arc surface and the right end arc surface of the support are milled on a five-axis numerical control milling machine, then the bearing mounting end surface is milled, a pin shaft hole is drilled and bored, and finally a mounting side hole is drilled. The machining clamp disclosed by the invention is simple in structure, firm in clamping, not easy to deform and easy to measure, and the machining of all machining elements can be completed by one-time clamping by adopting the machining method disclosed by the invention, so that the machining efficiency is high, and the quality is guaranteed.
Description
Technical Field
The invention belongs to the field of manufacturing of aero-engines, and particularly relates to a machining clamp of a pulley bracket product and a pulley bracket machining method adopting the clamp.
Background
The pulley bracket 5 is an important part mounted on the engine, and referring to fig. 1, the pulley bracket 5 is equipped with a ball bearing 6, a washer 7, a pin assembly 8, a nut 9 and a cotter pin 10. The blank of the pulley bracket 5 is a casting made of ZTC4, which has good castability and corrosion resistance.
As shown in FIG. 7, the pulley bracket 5 is finally assembled with the ball bearing 6, the bearing mounting endThe perpendicularity requirement of the pin bore 55 on the face 54 to the bearing-mounting end face 54 is
The precision of the pin shaft hole 55 is higher and is not more than 0.02mm, and the pin shaft hole 55, the bracket left end arc-shaped surface 51, the bracket right end arc- shaped surface 52 and 6 pin shaft holes
The mounting edge holes 56 have corresponding positional relationships.
During actual processing, because of the blank is heterotypic cavity structure, and the appearance of left and right lower extreme is the arc (corresponding support left end arcwall face 51 and support right-hand member arcwall face 52), there is a bearing installation terminal surface 54 upper end, and left and right both ends have a plurality of installation limit holes 56 to process on the surface, and relevant size is mostly spatial dimension, and is whole more complicated, and the wall is thinner, and difficult clamping and measurement lead to the processing cycle of this type of product longer, and the cost is higher, and is difficult qualified.
Disclosure of Invention
The invention aims to provide a pulley bracket machining clamp and a clamping method, explores and summarizes the aero-engine pulley bracket machining method and carries out the machining clamp design, improves the machining efficiency of the pulley bracket, realizes that all machining elements can be machined by one-time clamping, simultaneously meets the requirements of simple clamping, high precision, firm clamping, difficult deformation and easy measurement, and lays a foundation for machining of like products in the future.
The main innovation of the invention comprises two aspects of groping establishment of the movable pulley bracket processing method and design of the processing clamp.
In order to achieve the purpose, the invention adopts the following technical scheme:
a pulley bracket machining clamp comprises a bearing mounting end face, a bulge positioned on the inner side surface of the pulley bracket and mounting side holes positioned at the left end and the right end of the pulley bracket,
the surface of the base comprises an upward convex and continuous supporting surface, the supporting surface extends from the mounting edge hole at the left end of the pulley bracket to the mounting edge hole at the right end, the shape of the supporting surface meets the condition that when the supporting surface is completely attached to the surface where the mounting edge hole at the left end is located, the surface where the mounting edge hole at the right end is located and the surface where the protrusion is located, no contact exists between the supporting surface and the mounting end surface of the bearing, and the supporting surface is provided with a threaded hole;
the pressing plate is detachably connected to the base and comprises a left pressing plate and a right pressing plate, the left pressing plate is arranged on one side, in contact with the mounting edge hole in the left end of the pulley support, of the supporting surface, and the right pressing plate is arranged on one side, in contact with the mounting edge hole in the right end of the pulley support, of the supporting surface;
the screw penetrates through the threaded hole of the pressure plate and is in threaded connection with the supporting surface;
and the avoidance groove is positioned on the supporting surface and used for avoiding the protrusion.
Further, the base surface further comprises a first side surface and a second side surface which are parallel, and the first side surface and the second side surface are perpendicular to the supporting surface.
Further, the base surface further comprises a first step surface and a second step surface, the first step surface is connected with the left end of the supporting surface, and the second step surface is connected with the right end of the supporting surface.
Further, the base surface still includes the bottom surface, and the bottom surface is a plane of perpendicular to first side surface and second side surface, and the one end on first step surface of bottom surface are connected, and the other end and the one end on second step surface of bottom surface are connected.
Further, the pulley support machining clamp needs heat treatment, and the hardness of the machining clamp is ensured to meet the requirement.
A pulley support machining method comprises the steps of forming a support left end arc-shaped face, a support right end arc-shaped face, a bearing installation end face and installation side holes located at the left end and the right end of a pulley support, forming a pin shaft hole in the bearing installation end face, enabling the pin shaft hole to meet the requirement of verticality of the bearing installation end face, enabling the precision of the pin shaft hole to be not more than 0.02mm, limiting the position relation among the axis of the pin shaft hole, the support left end arc-shaped face, the support right end arc-shaped face and the installation side holes, adopting the machining clamp, and forming the pulley support through the machining clamp,
firstly, linear cutting reference surfaces, namely machining two reference surfaces on a pulley bracket by adopting a linear cutting machine, wherein the two reference surfaces are respectively positioned on the inner side surfaces of the positions of mounting side holes at the left end and the right end of the pulley bracket;
secondly, milling an arc-shaped surface at the left end of the support and an arc-shaped surface at the right end of the support, mounting the pulley support on the base, checking a fit clearance between the pulley support and the support surface when the two reference surfaces are fitted with the support surface, fastening the pulley support on the base through a pressing plate and a screw if the clearance requirement is met, and fixing the base clamped with the pulley support on a five-axis numerical control milling machine;
milling a bearing mounting end face, and milling the bearing mounting end face on a five-axis numerical control milling machine;
drilling and boring a pin shaft hole, and drilling and boring the pin shaft hole on a five-axis numerical control milling machine;
and fifthly, drilling a mounting side hole, and drilling the mounting side hole on a five-axis numerical control milling machine.
Further, in the second step, the fit clearance between the pulley bracket and the supporting surface is checked through the feeler gauge.
Further, the machining method of the pulley bracket also comprises bench work treatment for removing excess materials after the pulley bracket is machined.
The pulley bracket processing clamp and the processing method have the following characteristics:
firstly, the machining clamp is provided with a continuous supporting surface, the supporting surface is attached to two reference surfaces on the pulley support, positioning and clamping of a plurality of machining elements on the pulley support are achieved, the clamping surface is increased through surface contact under the condition that machining of the plurality of machining elements is not interfered, the clamping firmness is improved, and the machining precision is improved conveniently;
secondly, two reference surfaces are machined firstly in the machining method, and then the remaining machining elements (the bearing installation end surface, the pin shaft hole, the left end and right end arc-shaped surfaces of the bracket and the installation side hole) are machined integrally after being clamped by a clamp, so that the sequence not only ensures that the position degree and the size among the machining elements meet the requirements, but also can complete the machining of all the elements on one machine tool, and the precision and the position degree are ensured;
thirdly, the inner side surface of the pulley bracket is selected as a clamping surface in the machining method and the machining clamp, so that the pulley bracket and the machining clamp are firmly clamped together, all machining elements can be machined by one-time clamping, and the machining efficiency is improved;
fourthly, compared with the existing processing and clamping method, the reference surface and the clamping surface on the pulley bracket are reasonably selected, the number of clamping structures such as a pressing plate, a pressing block and a cushion block is reduced, the part clamping deformation is reduced, the interference position is avoided, and the clamping switching times are reduced;
fifthly, the supporting surface adopted by the processing clamp is matched with the datum plane of the pulley bracket, so that the supporting surface does not invade the internal space of the pulley bracket, and the relevant dimension can be conveniently measured.
Compared with the prior art, the pulley bracket processing clamp and the processing method can well solve the processing problem of the pulley bracket product, shorten the processing period of the product, ensure the processing quality of the product and greatly improve the processing efficiency.
The invention explores the clamp for machining the pulley bracket of the aero-engine, the machining clamp is reliable and effective, the cost is proper, the quality and the quantity of products can be guaranteed, the clamp can be machined efficiently, the cost of one set of clamp is below 1000 yuan per set, and the clamp is suitable for various manufacturers.
Drawings
FIG. 1 is a schematic view of a pulley carriage assembly;
FIG. 2 is a schematic view of a sheave bracket clamped to a machining fixture;
FIG. 3 is a schematic view of a pulley support machining fixture;
FIG. 4 is a left side view of the pulley bracket;
FIG. 5 is a top view of the pulley carriage;
FIG. 6 is a bottom view of the pulley bracket;
FIG. 7 is a schematic view of the location and dimensions of the bearing mounting end face, the pin shaft hole and the mounting edge hole in the pulley bracket;
in the figure: 1-a base; 2-pressing a plate; 3-screws; 4-avoidance groove; 5-a pulley support; 51-arc surface of left end of bracket; 52-arc-shaped surface of right end of the bracket; 53-datum level; 54-bearing mounting end face; 55-pin shaft hole; 56-mounting side holes; 57-convex; 6-ball bearings; 7-a gasket; 8-a pin assembly; 9-flower nut; 10-cotter pin.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments, but it should not be understood that the scope of the subject matter of the present invention is limited to the following embodiments, and various modifications, substitutions and alterations made based on the common technical knowledge and conventional means in the art without departing from the technical idea of the present invention are included in the scope of the present invention.
Referring to fig. 1, a pulley holder 5 is provided with a ball bearing 6, a washer 7, a pin assembly 8, a threaded nut 9 and a cotter pin 10. The blanks of the pulley bracket 5 are all castings made of ZTC4, and the castings are provided with special-shaped cavities, wherein the special-shaped cavities are internally provided with a protrusion 57, and an included angle larger than 90 degrees is formed between two inner surfaces connected with the protrusion 57. As shown in FIG. 7, the pulley holder 5 is finally assembled with the ball bearing 6, and the pin shaft hole 55 (inner diameter: ball bearing) of the bearing mounting end face 54
) The perpendicularity requirement for the bearing-mounting end face 54 is
The precision of the pin shaft hole 55 is higher and is not more than 0.02mm, and the pin shaft hole 55, the bracket left end arc-shaped surface 51, the bracket right end arc- shaped surface 52 and 6 pin shaft holes
The mounting-side holes 56 have corresponding positional relationships (the vertical distance from the mounting-side hole 56 to the bearing-mounting end surface 54 is a, and the vertical distance from the axis of the pin-shaft hole 55 is C).
The pulley bracket 5 needs to process the shapes of the left and right lower ends, the bearing mounting end surface 54, the pin shaft hole 55 and the mounting side hole 56, and the requirements on the relevant dimensions and technical conditions are accurate. In order to shorten the processing period and improve the processing efficiency and the processing quality, the five-axis machining center (five-axis numerical control milling machine) needs to be processed once to ensure the realization.
In terms of the design of the machining jig, the machining of the pulley bracket 5 cannot be carried out without initial preparation for production, and the preparation of the jig is particularly important. The set of clamps plays a decisive role in the machining of the pulley bracket 5. The processing clamp comprises a base 1, a screw 3, a nut and a pressing plate 2. As shown in fig. 2 and 3, the machining jig includes:
the surface of the base 1 comprises an upward convex and continuous supporting surface, the supporting surface extends from the mounting edge hole 56 at the left end of the pulley bracket 5 to the mounting edge hole 56 at the right end, the shape of the supporting surface is such that when the supporting surface is completely attached to the surface where the mounting edge hole 56 at the left end is located, the surface where the mounting edge hole 56 at the right end is located and the surface where the protrusion 57 is located, no contact is made between the supporting surface and the bearing mounting end surface 54, and the supporting surface is provided with a threaded hole;
the pressing plate 2 is detachably connected to the base 1, the pressing plate 2 comprises a left pressing plate and a right pressing plate, the left pressing plate is arranged on one side, in contact with the mounting edge hole 56 at the left end of the pulley support 5, of the supporting surface, and the right pressing plate is arranged on one side, in contact with the mounting edge hole 56 at the right end of the pulley support 5, of the supporting surface;
the screw 3 penetrates through the pressing plate 2 and is in threaded connection with a threaded hole of the supporting surface, and the pressing plate 2 is compressed by matching with a nut;
the avoidance groove 4 is positioned on the supporting surface and used for avoiding the protrusion 57;
the surface of the base 1 also comprises a first side surface and a second side surface which are parallel, and the first side surface and the second side surface are vertical to the supporting surface;
the surface of the base 1 also comprises a first step surface and a second step surface, the first step surface is connected with the left end of the supporting surface, and the second step surface is connected with the right end of the supporting surface;
the surface of the base 1 further comprises a bottom surface, the bottom surface is a plane perpendicular to the first side surface and the second side surface, one end of the bottom surface is connected with one end of the first step surface, and the other end of the bottom surface is connected with one end of the second step surface.
Because this adds clamping apparatus for the assembly member, at first decompose the anchor clamps into: the clamp base 1, the screw 3, the pressing plate 2 and the nut are four single pieces, then the four single pieces are processed respectively, the inner cavity of a product is a plane with a corresponding angle (namely, two inner surfaces with angles, which are connected by the bulge 57), so that the matching processing between the upper molded surface (namely, the supporting surface) of the clamp base 1 and the matching surface of the inner cavity of the product is processed (namely, the shape of the supporting surface needs to be processed according to the inner surface of the pulley bracket 5, particularly the inner surface parameters of the two reference surfaces 53 and the two included angles at the bulge 57, the characteristic surface of the pulley bracket 5 is mapped firstly, the supporting surface is processed after specific size data is obtained), the accurate positioning gapless of the clamp is ensured, then a special-shaped groove structure is processed on the molded surface of the clamp base 1 to serve as an avoiding groove 4, and the processing clamp is ensured not to interfere with the product (can contain the bulge 57). Moreover, threaded holes at 4 positions need to be processed on the surfaces of two sides of the supporting surface of the base 1, so that the pressing plate 2 and the screws 3 can be conveniently installed. Before machining, a product is positioned and clamped on a machining clamp (namely, a reference surface 53 is attached to a supporting surface), a clearance between the product and the supporting surface of the machining clamp is checked to be not more than 0.05mm by using a feeler gauge, then a pressing plate 2 is arranged on a screw 3 and is compressed by a nut, and finally the clamp and the product are fixed on a five-axis machining center (a five-axis numerical control milling machine) for one-time clamping and machining.
The basic flow of the machining method is to perform line cutting on two reference surfaces 53 → milling the left end arc surface 51 of the bracket, the right end arc surface 52 of the bracket → milling the bearing mounting end surface 54 → drilling and boring the pin shaft hole 55 → drilling the mounting side hole 56 → product inspection aiming at the cast blank of the pulley bracket 5. The processing method specifically comprises the following steps:
firstly, linear cutting a reference surface 53, wherein a linear cutting machine is adopted to machine two reference surfaces 53 on a pulley bracket 5, and the two reference surfaces 53 are respectively positioned on the inner side surfaces of the positions of mounting side holes 56 at the left end and the right end of the pulley bracket 5;
secondly, milling an arc-shaped surface 51 at the left end of the support and an arc-shaped surface 52 at the right end of the support, installing the pulley support 5 on the base 1, checking a fit clearance between the pulley support 5 and the support surface by using a feeler gauge when two reference surfaces 53 are fitted with the support surface, fastening the pulley support 5 on the base 1 through a pressing plate 2 and a screw 3 if the clearance requirement is met, and fixing the base 1 with the pulley support 5 on a five-axis numerical control milling machine;
milling the bearing mounting end surface 54, and milling the bearing mounting end surface 54 on a five-axis numerical control milling machine;
drilling and boring a pin shaft hole 55, and drilling and boring the pin shaft hole 55 on a five-axis numerical control milling machine;
step five, drilling a mounting side hole 56, and drilling the mounting side hole 56 on a five-axis numerical control milling machine;
and step six, performing bench work, removing excess materials, such as burrs, after the pulley bracket 5 is machined, and finishing the pulley bracket 5.
The machining equipment comprises a wire cutting machine, a numerical control lathe, a numerical control milling machine, a heat treatment machine and a bench work table, wherein the wire cutting machine is responsible for machining two reference surfaces 53 of a product, the numerical control lathe is responsible for machining a nut, a screw 3 and a pressing plate 2 in a clamp, the numerical control milling machine (a five-axis machining center, in particular to the five-axis numerical control milling machine) is responsible for machining a bearing installation end surface 54, a pin shaft hole 55 and a clamp base 1 of the product, the heat treatment machine is responsible for ensuring the hardness requirement of a clamp material, and the bench work table is responsible for machining products and excessive materials such as burrs and the like after the clamp is machined.
By adopting the machining fixture and the machining method to machine the pulley support 5, the pulley support can be machined on a five-axis machining center (a five-axis numerical control milling machine) at one time, the efficiency is improved by 2-4 times compared with the prior art, and the product quality is qualified by 100%.
Claims (6)
1. The utility model provides a pulley support's processing method, pulley support (5) include support left end arcwall face (51), support right-hand member arcwall face (52), bearing installation terminal surface (54), be located pulley support (5) inboard surface protruding (57) and be located pulley support (5) left and right both ends installation limit hole (56), it has round pin shaft hole (55) to open on bearing installation terminal surface (54), and round pin shaft hole (55) have the straightness requirement that hangs down to bearing installation terminal surface (54), the precision in round pin shaft hole (55) is not more than 0.02mm, there is the position relation restriction between the axis in round pin shaft hole (55) and support left end arcwall face (51), support right-hand member arcwall face (52), installation limit hole (56), its characterized in that:
the adopted processing clamp comprises a plurality of processing clamps,
the pulley support comprises a base (1), wherein the surface of the base (1) comprises an upward-protruding and continuous supporting surface, the supporting surface extends from a mounting edge hole (56) at the left end of a pulley support (5) to a mounting edge hole (56) at the right end, the supporting surface is in a shape which is free of contact with a bearing mounting end surface (54) when the supporting surface is completely attached to the surface where the mounting edge hole (56) at the left end is located, the surface where the mounting edge hole (56) at the right end is located and the surface where a protrusion (57) is located, and threaded holes are formed in the supporting surface;
the pressing plate (2) is detachably connected to the base (1), the pressing plate (2) comprises a left pressing plate and a right pressing plate, the left pressing plate is arranged on one side, in contact with the mounting edge hole (56) at the left end of the pulley support (5), of the supporting surface, and the right pressing plate is arranged on one side, in contact with the mounting edge hole (56) at the right end of the pulley support (5), of the supporting surface;
the screw (3) penetrates through the pressure plate (2) and is in threaded connection with a threaded hole of the supporting surface;
an avoidance groove (4), the avoidance groove (4) is positioned on the supporting surface and is used for avoiding the protrusion (57),
the processing method comprises the following steps of,
firstly, cutting reference surfaces (53) by a wire cutting machine, wherein two reference surfaces (53) on a pulley bracket (5) are machined by the wire cutting machine, and the two reference surfaces (53) are respectively positioned on the inner side surfaces of the positions of mounting side holes (56) at the left end and the right end of the pulley bracket (5);
secondly, milling an arc-shaped surface (51) at the left end of the support and an arc-shaped surface (52) at the right end of the support, installing the pulley support (5) on the base (1), checking a fit clearance between the pulley support (5) and the support surface when the two reference surfaces (53) are fitted with the support surface, fastening the pulley support (5) on the base (1) through the pressing plate (2) and the screw (3) if the requirement on the clearance is met, and fixing the base (1) clamped with the pulley support (5) on a five-axis numerical control milling machine;
milling a bearing mounting end face (54), and milling the bearing mounting end face (54) on a five-axis numerical control milling machine;
fourthly, drilling and boring a pin shaft hole (55), and drilling and boring the pin shaft hole (55) on a five-axis numerical control milling machine;
and step five, drilling a mounting side hole (56), and drilling the mounting side hole (56) on a five-axis numerical control milling machine.
2. The method for machining the pulley bracket according to claim 1, wherein: in the second step, the fit clearance between the pulley bracket (5) and the supporting surface is checked through the feeler gauge.
3. The method for machining the pulley bracket according to claim 1, wherein: and the method also comprises bench work treatment for removing the excess after the pulley bracket (5) is processed.
4. The method for machining the pulley bracket according to claim 1, wherein: the surface of the base (1) also comprises a first side surface and a second side surface which are parallel, and the first side surface and the second side surface are vertical to the supporting surface.
5. The method for machining the pulley bracket according to claim 1, wherein: the surface of the base (1) further comprises a first step surface and a second step surface, the first step surface is connected with the left end of the supporting surface, and the second step surface is connected with the right end of the supporting surface.
6. The method for machining the pulley bracket according to claim 1, wherein: the surface of the base (1) further comprises a bottom surface, the bottom surface is a plane perpendicular to the first side surface and the second side surface, one end of the bottom surface is connected with one end of the first step surface, and the other end of the bottom surface is connected with one end of the second step surface.
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| CN202110747690.7A CN113399947B (en) | 2021-07-01 | 2021-07-01 | Pulley bracket machining clamp and machining method |
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| CN113399947B true CN113399947B (en) | 2022-03-22 |
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| KR20100099924A (en) * | 2009-03-04 | 2010-09-15 | 성진기업(주) | Clamping jig of work piece |
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