CN214237230U - Milling machine universal fixture - Google Patents
Milling machine universal fixture Download PDFInfo
- Publication number
- CN214237230U CN214237230U CN202120167279.8U CN202120167279U CN214237230U CN 214237230 U CN214237230 U CN 214237230U CN 202120167279 U CN202120167279 U CN 202120167279U CN 214237230 U CN214237230 U CN 214237230U
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- floating
- eccentric wheel
- shaped block
- shaped
- pressing plate
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- 238000003801 milling Methods 0.000 title claims abstract description 22
- 238000007667 floating Methods 0.000 claims abstract description 52
- 238000003825 pressing Methods 0.000 claims abstract description 15
- 238000003754 machining Methods 0.000 abstract description 8
- 238000012545 processing Methods 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Abstract
The invention relates to a universal fixture of a milling machine in the technical field of lathe machining tool fixtures.A V-shaped block is arranged on a fixture body, floating pressure plates are symmetrically arranged on the left side and the right side of the V-shaped block, V-shaped ports on the left side and the right side of the V-shaped block correspond to V-shaped ports of the floating pressure plates, horizontal through holes are arranged in the V-shaped block and the floating pressure plates, and a floating screw rod penetrates through the through holes; the left end of the floating screw is connected by a nut, and the right end surface of the nut is tightly attached to the left end surface of the floating pressing plate on the left side; the right end of the floating screw is hinged with an eccentric wheel by adopting a shaft pin, the circumference of the eccentric wheel is tightly attached to the right end surface of the floating pressing plate on the right side, and a handle is arranged on the circumference of the eccentric wheel; the five-point precise positioning is realized by adopting the V-shaped block, the floating pressing plate and the bottom surface of the clamp body; the eccentric wheel is used, the clamping force of the clamp is quantized and controllable, the milling stability is improved, and the quality of a workpiece processing product is ensured; the four V-shaped openings can be used for processing four workpieces at one time, so that the production efficiency is improved, and the labor intensity is reduced.
Description
Technical Field
The invention relates to the field of lathe machining tool clamp technology and equipment, in particular to a milling machine universal clamp.
Background
The milling machine is used as a common machine tool for machining mechanical parts, is mainly applied to machining of various complex plane, curved surface and shell parts, and the commonly machined parts comprise various parts such as cams, connecting rods, boxes, sleeve grooves and the like.
The sleeve part is widely applied to various machines and mainly plays a role in supporting or guiding, when the sleeve is used for processing a slot on a milling machine, a clamp is required to clamp the sleeve, and then the milling processing slot can be carried out; the clamp in the prior art can only clamp one sleeve for processing operation once, the production efficiency is low, the clamping force of the clamp cannot be quantitatively controlled, the clamping force is high and low, the yield of the sleeve of a processed workpiece is low, the quality is difficult to guarantee, the processing cost is high, the economic benefit is low, and the competitiveness is lacked.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a universal fixture for a milling machine.
The technical scheme adopted by the invention is as follows:
a milling machine universal fixture comprises a fixture body, wherein a V-shaped block is arranged on the fixture body, floating pressure plates are symmetrically arranged on the left side and the right side of the V-shaped block, V-shaped openings on the left side and the right side of the V-shaped block correspond to V-shaped openings of the floating pressure plates, horizontal through holes are formed in the V-shaped block and the floating pressure plates, and a floating screw rod penetrates through the through holes;
the left end of the floating screw is connected by a nut, and the right end surface of the nut is tightly attached to the left end surface of the floating pressing plate on the left side; the right end of the floating screw rod is hinged with an eccentric wheel by adopting a shaft pin, the circumference of the eccentric wheel is tightly attached to the right end surface of the floating pressing plate on the right side, and a handle is arranged on the circumference of the eccentric wheel.
Further, a spring is wound on the floating screw rod between the V-shaped block and the floating pressure plate.
The universal fixture for the milling machine is connected with a workbench of the milling machine through screws, clamps clamp a sleeve of a workpiece to be machined, and performs slotting machining operation on the milling machine.
The research and development thought of the invention is as follows:
1. the clamping force is determined, an eccentric clamping mechanism is used, an eccentric wheel with a rotating center offset from a geometric center is used as a clamping piece, the clamping structure is simple, the clamping is rapid, the operation is convenient, the eccentric wheel does not directly clamp the workpiece, but compresses a floating pressure plate, and the force is applied to the workpiece through the floating pressure plate;
the clamp of the invention is characterized in that the original force is acted on the handle to make the eccentric wheel rotate around the shaft pin. The fact that the eccentric is spread out in a circular arc corresponds to a shape which is a wedge, characterized in that the lead angle corresponds to the wedge angle, which is not a constant but is dependent on the position of the clamping point. The lift angle of the eccentric wheel is variable, which is an important characteristic of the eccentric wheel clamping mechanism, and the clamping force and the self-locking condition are closely related to the lift angle;
2. the parameter design of an eccentric clamping element, namely an eccentric wheel;
1) the eccentric amount e, the size of the eccentric amount e of the eccentric wheel, and the clamping stroke of the eccentric wheel are influenced, and are calculated by the following calculation formula e = (S3+ S4)/(COSy1-COSy 2); wherein S3 is the size error compensation value of the workpiece in the clamping direction, namely the size tolerance of the workpiece, and S4 is the stroke stock amount of 0.1-0.3 mm. When the mechanism is not provided with an adjustable ring, the manufacturing error and abrasion of the eccentric wheel are considered to be large;
2) clamp force and handle length, when pressing from both sides tightly, the power of acting on the eccentric wheel has: the original force on the handle, the reaction force of the shaft pin and the workpiece, and the three should be in a balanced state, wherein W = QL/[ f (R + R) + e (siny-fcosy) ], wherein W is the clamping force, Q is the original force applied on the handle, L is the length of the force arm, f is the friction coefficient, R is the radius of the eccentric wheel, R is the radius of the shaft pin, e is the eccentricity, and y is the included angle between the geometric center of the eccentric wheel and the connecting line of the rotating center and the geometric center of the eccentric wheel and the connecting line of the clamping point. When the handle length L and the force Q on the handle are known, the required clamping force W can be calculated;
3. in the analysis of the positioning error, a position error of the machined surface with respect to the process reference due to the positioning of the workpiece is referred to as a positioning error. Therefore, the positioning error is also a positional variation of the process reference in the machining request direction at the time of positioning the workpiece. The positioning error is caused by a reference error and a reference misalignment error. The V-shaped block is used for positioning, the workpiece is convenient to assemble and disassemble, the centering positioning can be guaranteed, and when the workpiece central plane is used as a working procedure reference, the positioning error is zero.
The invention has the beneficial effects that:
1) the five-point precise positioning device adopts the three-in-one combination of the V-shaped block, the floating pressure plate and the bottom surface of the clamp body to realize the five-point precise positioning; the eccentric wheel is used, the clamping force of the clamp is quantized and controllable, the milling stability is improved, and the quality of a workpiece processing product is ensured;
2) the four V-shaped ports are formed in the V-shaped block and the floating pressing plate, so that four workpieces can be processed at one time, and the production efficiency is improved by four times; for small workpieces, more V-shaped openings can be arranged, and more workpieces can be processed at one time.
Drawings
FIG. 1 is a schematic view of a sleeve workpiece that has been grooved.
FIG. 2 is a schematic sectional view taken along line A-A in FIG. 1.
FIG. 3 is a schematic diagram of a milling machine universal fixture.
In the figure, 1-handle, 2-eccentric wheel, 3-floating screw, 4-floating pressure plate, 5-V-shaped block, 6-spring, 7-nut, 8-clamp body, 9-sleeve and 11-notch.
Detailed Description
Fig. 1 and 2 are schematic diagrams of a grooved workpiece sleeve, and fig. 3 is a schematic diagram of a universal fixture for a milling machine, which includes a fixture body 8, wherein a V-shaped block 5 is arranged on the fixture body 8, floating pressure plates 4 are symmetrically arranged on the left and right sides of the V-shaped block 5, V-shaped ports on the left and right sides of the V-shaped block 5 correspond to the V-shaped ports of the floating pressure plates 4, horizontal through holes are arranged in the V-shaped block and the floating pressure plates, and a floating screw 3 passes through the through holes;
the left end of the floating screw rod 3 is connected by a nut 7, and the right end face of the nut 7 is tightly attached to the left end face of the left floating pressing plate 4; the right end of the floating screw rod is hinged with an eccentric wheel 2 by adopting a shaft pin, the circumference of the eccentric wheel is tightly attached to the right end surface of the floating pressing plate on the right side, and a handle 1 is arranged on the circumference of the eccentric wheel.
Further, on the floating screw between the V-block and the floating press plate, a spring 6 is wound.
The universal fixture for the milling machine is connected with a workbench of the milling machine through screws, clamps clamp a sleeve of a workpiece to be machined, and performs slotting machining operation on the milling machine.
The invention relates to a milling machine universal fixture design and operation instruction, which comprises the following steps:
1) the workpiece to be machined is a sleeve workpiece, the workpiece is made of 45-grade steel, and a groove needs to be milled on the upper surface, and in the figures 1 and 2, the left notch and the right notch are respectively a notch, belonging to rough machining;
2) the positioning scheme adopts a V-shaped block, a floating pressure plate and the bottom surface of a clamp body, three-in-one combined positioning is adopted, as shown in figure 3, the V-shaped block and the floating pressure plate position the outer cylindrical surface of a workpiece, two V-shaped openings clamp a sleeve, and four uncertainties of two movements and two rotations can be eliminated, namely the positioning is carried out on an X axis and a Y axis; in addition, the end face of the excircle of the sleeve is used as a positioning reference, and the movement uncertainty in the vertical direction is eliminated through the supporting end face, namely the movement uncertainty of the workpiece on the Z axis is eliminated, so that five-point positioning is realized;
3) the clamping scheme is that the workpiece is roughly machined, and the clamping method belongs to small-batch production. The design of the clamp should be based on convenient operation, direct and rapid transmission of clamping force, and fast installation and disassembly of workpieces. Based on the consideration of processing efficiency, the clamp adopts a manual clamping device and an eccentric wheel clamping mechanism.
4) Operation of the clamp of the invention:
(1) a workpiece is placed in a V-shaped opening of the V-shaped block, the handle is rotated anticlockwise, the eccentric wheel rotates around the shaft pin, and the outer circle of the eccentric wheel gradually compresses the floating pressing plate; the larger the rotation angle of the handle is, the larger the clamping force of the clamp on the workpiece is; the handle rotates a certain angle and corresponds to a certain clamping force; the larger the workpiece is, the larger the clamping force is needed, and the larger the angle of rotation of the handle is; the smaller the workpiece is, the smaller the clamping force is, the smaller the rotation angle of the handle is, the simple operation is realized, and the operation is easy to get;
(2) after the V-shaped ports in the floating press plates on the left side and the right side are stressed, the outer circular surface of the workpiece is pressed tightly, and the workpiece is clamped tightly;
(3) the spring is compressed and tightened under stress, and energy is stored;
(4) after the workpiece is machined, the handle is rotated clockwise, the eccentric wheel rotates clockwise, the eccentric wheel is far away from the floating pressing plate, the compressed spring quickly recovers the original shape because of the disappearance of external force, the floating pressing plates on the left side and the right side quickly bounce leftwards and rightwards under the action of the spring force, and the workpiece can be taken out at the moment.
Claims (2)
1. A milling machine universal fixture is characterized in that:
the clamp comprises a clamp body, wherein a V-shaped block is arranged on the clamp body, floating pressure plates are symmetrically arranged on the left side and the right side of the V-shaped block, V-shaped openings on the left side and the right side of the V-shaped block correspond to the V-shaped openings of the floating pressure plates, horizontal through holes are formed in the V-shaped block and the floating pressure plates, and a floating screw rod penetrates through the through holes;
the left end of the floating screw is connected with the left end face of the floating pressing plate, and the right end face of the nut is tightly attached to the left end face of the left floating pressing plate; the right end of the floating screw rod is hinged with an eccentric wheel through a shaft pin, the circumference of the eccentric wheel is tightly attached to the right end face of the floating pressing plate on the right side, and a handle is arranged on the circumference of the eccentric wheel.
2. A milling machine universal fixture according to claim 1, wherein: and a spring is wound on the floating screw rod between the V-shaped block and the floating pressure plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120167279.8U CN214237230U (en) | 2021-01-21 | 2021-01-21 | Milling machine universal fixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120167279.8U CN214237230U (en) | 2021-01-21 | 2021-01-21 | Milling machine universal fixture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214237230U true CN214237230U (en) | 2021-09-21 |
Family
ID=77751455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120167279.8U Expired - Fee Related CN214237230U (en) | 2021-01-21 | 2021-01-21 | Milling machine universal fixture |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214237230U (en) |
-
2021
- 2021-01-21 CN CN202120167279.8U patent/CN214237230U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210921 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |