CN110860926A - CNC machining thin-walled workpiece combined clamp and clamping method - Google Patents

Abstract

A combined fixture for CNC machining thin-walled parts, the combined fixture includes a fixture A and a fixture B, wherein the fixture A is provided with a fixture main board, and the left and right sides of the upper surface of the fixture main board are recessed downward to form a pressure groove, and two pressure grooves are formed. The positioning surfaces are formed between the grooves and the upper surface of the main board of the fixture. Each pressure groove is provided with two fixing units, front and rear. The fixing units include a fixing block. The fixing block is fixed in the pressure groove by M8 fixing screws. At the same time, an M10 locking screw is penetrated from the outside to the inside. The middle position of the main board of the fixture B is horizontal and the front and rear sides are inclined upward to form a slope. The middle position of the main board of the fixture is evenly distributed with positioning circles. The lower concave is formed, the positioning circle is penetrated from bottom to top by M8 fixing screws, and the positioning circle is strictly positioned by multiple uniform force clamping. The thin-walled cavity is processed according to the reference hole, which controls the deformation of the workpiece and the processing size is stable. Improved production efficiency.

Description

A combination fixture and clamping method for CNC machining thin-walled parts

technical field

The invention relates to the field of mechanical manufacturing, in particular to a combined fixture for CNC machining thin-walled parts and a clamping method.

Background technique

The earlier fixture type is mainly composed of movable jaws and fixed jaws. The type is relatively simple. The defects of this type are: difficult to locate, difficult to clamp, easy to cause serious deformation of the workpiece, large deviation of processing size, flatness , The parallelism dimension is very unstable, which affects the machining accuracy.

SUMMARY OF THE INVENTION

The invention aims to provide a CNC machining thin-walled component combined fixture and a clamping method which can ensure the verticality, coaxiality and cylindricity of the product.

In order to achieve the above-mentioned technical purpose, the present invention adopts the following technical solutions, a combination fixture for CNC machining thin-walled parts, the combination fixture comprises a fixture A and a fixture B, wherein the fixture A is provided with a fixture main board, and the fixture main board is a cuboid as a whole, so The left and right sides of the upper surface of the main plate of the fixture are recessed downward to form a pressure groove, and a positioning surface is formed between the two pressure grooves and the upper surface of the main plate of the fixture. There are two fixing units, front and rear. The fixing unit specifically includes a fixing block. The fixing block is fixed in the pressure groove by M8 fixing screws up and down. The fixing block is also penetrated from the outside to the inside by an M10 locking screw. penetrate through to be installed on the machine tool;

Fixture B is provided with a fixture mainboard. The middle position of the fixture mainboard is horizontal and the front and rear sides are inclined upward to form a slope. The front and rear slopes are consistent with the angle between the middle horizontal position of the fixture mainboard. The middle position of the fixture mainboard and the front and rear slopes form a positioning surface. The middle of the front side of the main board of the fixture is recessed downward to form a groove suitable for the shape of the workpiece. The front and rear sides of the main board of the fixture are penetrated up and down by M12 fixing screws to install the fixture B on the machine tool. The middle position of the main board of the fixture is evenly distributed. There is a positioning circle, the positioning circle is formed by the downward depression of the surface of the main board of the fixture, the positioning circle is penetrated from bottom to top by M8 fixing screws, and the M8 fixing screws are specifically penetrated from the bottom to the top of the fixture main board and the positioning circle.

Preferably, the fixing block of the fixture A is penetrated from top to bottom by two M8 fixing screws.

Preferably, the clamp A is provided with four M16 fixing screws, two of which pass through the positioning surface, and the other two are respectively set between the front and rear fixing blocks and pass through the pressure groove.

Preferably, there are three positioning circles evenly distributed in the middle of the main board of the fixture.

A clamping method for a combination fixture for CNC machining thin-walled parts, comprising the following steps:

1) Install the fixture A on the machine tool through the M16 fixing screws through the fixture bottom plate;

2) Preliminary processing, first loosen the M8 fixing screws of the pressing and fixing block, adjust the position of the fixing block in the pressure groove, control the position of the fixing block according to the hole position of the workpiece to be processed, and then tighten the M8 fixing screws to fix it. After that, the M10 locking screw that penetrates the fixing block from the outside to the inside is locked inward so that the end of the M10 locking screw penetrates into the hole of the workpiece, and the hole of the workpiece is set on the side of the workpiece. After the preliminary processing is completed, cut off the workpiece with holes The shape of the end of the locking screw matches the hole position, and the machine tool can drive the fixture to turn up and down and rotate left and right to perform preliminary processing on the workpiece;

3) Finishing the workpiece, after completing step 2), put the workpiece into the fixture B. The middle position of the fixture main board is horizontal and the front and rear sides are inclined upward to form an inclined plane. The middle position of the main board and the front and rear slopes form a positioning surface, the middle of the front side of the main board of the fixture is recessed downward to form a groove suitable for the shape of the workpiece, and there are positioning circles evenly distributed on the middle position of the main board of the fixture, and the positioning circle is formed by the main board of the fixture. The surface is recessed downward, and the positioning circle is penetrated from bottom to top by M8 fixing screws. The M8 fixing screws penetrate the main board of the fixture and the positioning circle from bottom to top. Put the preliminarily processed workpiece into the middle position of the main board of the fixture, and the bottom positioning holes Accurate positioning circle, the M8 fixing screw is pushed into the positioning hole from bottom to top to complete the fixation of the workpiece, and then the workpiece is finished.

In order to solve the problem that the earlier clamps are easy to cause difficult clamping, difficult positioning and clamping, which leads to waste of time, easy deformation and unstable machining accuracy, the present invention adjusts the clamping method and positioning reference, and adopts multiple uniform force clamping and fixing. And the positioning circle is strictly positioned, and the thin-walled cavity is processed according to the reference hole, which controls the deformation of the workpiece and the processing size is stable, and improves the production efficiency.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of embodiments taken in conjunction with the accompanying drawings, wherein:

Fig. 1 is the structural representation of fixture A;

FIG. 2 is a schematic diagram of the structure of the fixture B. FIG.

In the picture: 1. Fixture main board; 2. Pressure groove; 3. Positioning surface; 4. Fixing block; 5. M8 fixing screw; 6. M10 locking screw; 7. M16 fixing screw; 8. Fixture main board; 9. M12 fixing Screw; 10. Positioning circle; 11. M8 fixing screw; 12. Positioning surface.

Detailed ways

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, only used to explain the present invention, and should not be construed as a limitation of the present invention.

In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a mechanical connection or an electrical connection, or two The internal connection of each element can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific situations.

The following describes a combination fixture for CNC machining thin-walled parts according to an embodiment of the present invention with reference to FIGS. 1 to 2. The combination fixture includes a fixture A and a fixture B, wherein the fixture A is provided with a fixture main board 1, and the fixture main board 1 is a whole A rectangular parallelepiped, the left and right sides of the upper surface of the fixture mainboard 1 are recessed downward to form a pressure groove 2 respectively, and a positioning surface 3 is formed between the two pressure grooves 2 and the upper surface of the fixture mainboard 1, and the pressure groove 2 is provided with a fixed Each pressure groove 2 is provided with two fixed units, front and rear. The fixed unit specifically includes a fixed block 4. The fixed block 4 is fixed in the pressure groove 2 by M8 fixing screws 5 up and down, and the fixed block 4 is locked by an M10 at the same time. The screw 6 penetrates from the inside to the outside, and the fixture main board 1 is penetrated up and down by the M16 fixing screw 7 so as to be installed on the machine tool;

The fixture B is provided with a fixture main board 8, the middle position of the fixture main board 8 is horizontal and the front and rear sides are inclined upward to form inclined planes, and the front and rear sides of the inclined planes are consistent with the included angle of the middle horizontal position of the fixture main board 8. The middle position of the fixture main board 8 and the front and rear inclined planes The positioning surface 12 is formed, and the middle part of the front side of the main plate of the fixture 8 is recessed downward to form a groove suitable for the shape of the workpiece, and the front and rear sides of the main plate of the fixture 8 are penetrated up and down by M12 fixing screws 9 to install the fixture B on the machine tool, There are positioning circles 10 evenly distributed in the middle position of the main board 8 of the fixture. The positioning circle 10 is formed by the downward depression of the surface of the main board 8 of the fixture. The positioning circle 10 is penetrated from bottom to top by M8 fixing screws 11. It penetrates the clamp main board 8 and the positioning circle 10 upwards.

Preferably, the fixing block 4 of the fixture A is penetrated by two M8 fixing screws 5 from top to bottom.

Preferably, the clamp A is provided with four M16 fixing screws 7 , two of which penetrate the positioning surface 3 , and the other two are respectively arranged between the front and rear fixing blocks 4 and penetrate the pressing groove 2 .

Preferably, there are three positioning circles 10 evenly distributed in the middle of the main plate 8 of the clamp.

A clamping method for a combination fixture for CNC machining thin-walled parts, comprising the following steps:

1) Install the fixture A on the machine tool through the M16 fixing screws through the fixture bottom plate;

2) Preliminary processing, first loosen the M8 fixing screws of the pressing and fixing block, adjust the position of the fixing block in the pressure groove, control the position of the fixing block according to the hole position of the workpiece to be processed, and then tighten the M8 fixing screws to fix it. After that, the M10 locking screw that penetrates the fixing block from the outside to the inside is locked inward so that the end of the M10 locking screw penetrates into the hole of the workpiece, and the hole of the workpiece is set on the side of the workpiece. After the preliminary processing is completed, cut off the workpiece with holes The shape of the end of the locking screw matches the hole position, and the machine tool can drive the fixture to turn up and down and rotate left and right to perform preliminary processing on the workpiece;

3) Finishing the workpiece, after completing step 2), put the workpiece into the fixture B. The middle position of the fixture main board is horizontal and the front and rear sides are inclined upward to form an inclined plane. The middle position of the main board and the front and rear slopes form a positioning surface, the middle of the front side of the main board of the fixture is recessed downward to form a groove suitable for the shape of the workpiece, and there are positioning circles evenly distributed on the middle position of the main board of the fixture, and the positioning circle is formed by the main board of the fixture. The surface is recessed downward, and the positioning circle is penetrated from bottom to top by M8 fixing screws. The M8 fixing screws penetrate the main board of the fixture and the positioning circle from bottom to top. Put the preliminarily processed workpiece into the middle position of the main board of the fixture, and the bottom positioning holes Accurate positioning circle, the M8 fixing screw is pushed into the positioning hole from bottom to top to complete the fixation of the workpiece, and then the workpiece is finished.

In order to solve the problem that the earlier clamps are easy to cause difficult clamping, difficult positioning and clamping, which leads to waste of time, easy deformation and unstable machining accuracy, the present invention adjusts the clamping method and positioning reference, and adopts multiple uniform force clamping and fixing. And the positioning circle is strictly positioned, and the thin-walled cavity is processed according to the reference hole, which controls the deformation of the workpiece and the processing size is stable, and improves the production efficiency.

In the description of this specification, reference to a description of the terms "one embodiment," "example," or "some examples," etc. means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in the present invention. in at least one embodiment or example. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, The scope of the invention is defined by the claims and their equivalents.

Claims (5)

1. a CNC machining thin-walled part combination fixture, it is characterized in that, described combination fixture comprises fixture A and fixture B, wherein fixture A is provided with fixture mainboard, fixture mainboard is a cuboid as a whole, and two left and right sides of the upper surface of described fixture mainboard are provided. A pressure groove is formed in each of the side downward depressions, and a positioning surface is formed between the two pressure grooves and the upper surface of the main board of the fixture. The pressure groove is provided with a fixing unit, and each pressure groove is respectively provided with two front and rear fixing units. The fixing unit specifically includes a fixing block, the fixing block is penetrated up and down by M8 fixing screws and fixed in the pressure groove, the fixing block is penetrated from the outside to the inside by an M10 locking screw at the same time, and the fixture main board is penetrated up and down by M16 fixing screws to be installed on the machine tool; Fixture B is provided with a fixture mainboard. The middle position of the fixture mainboard is horizontal and the front and rear sides are inclined upward to form a slope. The front and rear slopes are consistent with the angle between the middle horizontal position of the fixture mainboard. The middle position of the fixture mainboard and the front and rear slopes form a positioning surface. The middle of the front side of the main board of the fixture is recessed downward to form a groove suitable for the shape of the workpiece. The front and rear sides of the main board of the fixture are penetrated up and down by M12 fixing screws to install the fixture B on the machine tool. The middle position of the main board of the fixture is evenly distributed. There is a positioning circle, the positioning circle is formed by the downward depression of the surface of the main board of the fixture, the positioning circle is penetrated from bottom to top by M8 fixing screws, and the M8 fixing screws are specifically penetrated from the bottom to the top of the fixture main board and the positioning circle. 2 . The combined fixture according to claim 1 , wherein the fixing block of the fixture A is penetrated from top to bottom by two M8 fixing screws. 3 . 3. The combination fixture according to claim 1, wherein the fixture A is provided with four M16 fixing screws, two of which penetrate the positioning surface, and the other two are respectively arranged between the front and rear two fixing blocks and penetrate the pressure groove . 4 . The combined fixture according to claim 1 , wherein three positioning circles are evenly distributed in the middle position of the main board of the fixture. 5 . 5. use the clamping method of a kind of CNC machining thin-walled part combination fixture of claim 1, is characterized in that, comprises the following steps: Fix fixture A to the machine tool through M16 fixing screws through the fixture base plate; For preliminary processing, first loosen the M8 fixing screws of the pressing and fixing block, adjust the position of the fixing block in the pressure groove, control the position of the fixing block according to the hole position of the workpiece to be processed, and then tighten the M8 fixing screws to fix the fixing block, Then, tighten the M10 locking screw that penetrates the fixing block from the outside to the inside, so that the end of the M10 locking screw penetrates into the hole of the workpiece, and the hole of the workpiece is set on the side of the workpiece. For the redundant part, the shape of the end of the locking screw matches the hole position, and the machine tool can drive the fixture to turn up and down and rotate left and right to perform preliminary processing on the workpiece; 3) Finishing the workpiece, after completing step 2), put the workpiece into the fixture B. The middle position of the fixture main board is horizontal and the front and rear sides are inclined upward to form an inclined plane. The middle position of the main board and the front and rear slopes form a positioning surface, the middle of the front side of the main board of the fixture is recessed downward to form a groove suitable for the shape of the workpiece, and there are positioning circles evenly distributed on the middle position of the main board of the fixture, and the positioning circle is formed by the main board of the fixture. The surface is recessed downward, and the positioning circle is penetrated from bottom to top by M8 fixing screws. The M8 fixing screws penetrate the main board of the fixture and the positioning circle from bottom to top. Put the preliminarily processed workpiece into the middle position of the main board of the fixture, and the bottom positioning holes Accurate positioning circle, the M8 fixing screw is pushed into the positioning hole from bottom to top to complete the fixation of the workpiece, and then the workpiece is finished.

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