A CNC milling fixture for machining the outer shapes of multiple wavy gaskets in a single clamping

Abstract

The present invention provides a CNC milling fixture for machining the outer shapes of multiple wavy gaskets in a single clamping, belonging to the technical field of machining. The fixture includes a pressing plate, a base, bolts, positioning pins, positioning bars and springs. The present invention adopts the CNC milling machining method, and two long wavy sheets can be clamped at one time to machine the outer shapes and holes of multiple wavy gaskets. During the machining process, situations that affect the machining efficiency such as re-threading are not involved, and the machining efficiency is greatly improved; moreover, the fixture uses upper and lower pressing for clamping, the clamping is firm, and the qualified rate is greatly improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of machining, and relates to a fixture for machining the outer shapes of multiple corrugated gaskets in a single clamping during the numerical control milling of the outer shape and internal holes of a corrugated gasket. Background Art

[0002] The corrugated gasket is first processed from a long strip into a long corrugated sheet by means such as rolling, as Figure 2 shown; then the long corrugated sheet is processed into multiple finished products by wire cutting, as Figure 1 shown.

[0003] There are two drawbacks in processing the long corrugated sheet into corrugated gaskets by wire cutting. One is that two lead holes smaller than the hole size need to be processed at the corresponding positions on the long corrugated sheet for each corrugated gasket finished product. During wire cutting, the wire needs to be threaded three times (twice for processing two holes and once for the outer shape), the processing is cumbersome and the efficiency is low; the other is that wire cutting is not easy to position, and the long corrugated sheet is prone to displacement during the processing, resulting in a low product qualification rate. Summary of the Invention

[0004] In order to solve the above problems in the prior art, the present invention changes the processing method of the corrugated gasket to numerical control milling, and proposes a numerical control milling fixture for machining the outer shapes of multiple corrugated gaskets in a single clamping. Two long corrugated sheets can be clamped at one time, and the outer shapes and holes of multiple corrugated gaskets can be processed. During the processing, situations that affect the processing efficiency such as re-threading the wire are not involved, and the processing efficiency is greatly improved; and the fixture uses upper and lower pressing for clamping, the clamping is firm, and the qualification rate is greatly improved.

[0005] The technical solution of the present invention is as follows:

[0006] A numerical control milling fixture for machining the outer shapes of multiple corrugated gaskets in a single clamping, including a pressing plate 1, a base 2, bolts 3, positioning pins 4, a positioning strip 6 and a spring.

[0007] The pressing plate 1 is strip-shaped, and its bottom is corrugated to match the outer shape of the clamped long corrugated sheet. There are 8 threaded countersunk holes evenly distributed along the length direction in the middle part of the pressing plate 1, and 2 positioning pin holes are provided.

[0008] On both sides of the pressing plate 1, a plurality of T-shaped grooves 8 are evenly opened along the length direction, which are used for the tool to have a moving space when numerically controlling the milling of the outer shape of the corrugated gasket. A T-shaped protruding structure 9 is formed between two adjacent T-shaped grooves 8. Two countersunk holes are provided at the end of the T-shaped protruding structure 9, and the small section size of the countersunk holes is slightly larger than the size of the holes to be processed of the corrugated gasket, which is used for processing the holes of the corrugated gasket.

[0009] The base 2 is a cuboid structure, and its upper surface is wavy to match the shape of the clamped long wavy sheet; the wavy shape on the upper surface of the base 2 is removed except for the clamping positions on both sides that cooperate with the pressing plate 1 and the middle position, which is used for the tool to feed during CNC milling.

[0010] At the clamping positions where the base 2 cooperates with the pressing plate 1, positioning parts 12 are formed, and two holes slightly larger than the processing hole size of the wavy gasket are opened on each positioning part 12; the length and width of the positioning part 12 are equal to the length and width of the wavy gasket.

[0011] The positioning bar 6 is a small rectangular bar, which is embedded between the wavy shape at the middle position of the base 2 and the positioning part 12 to position the long wavy sheet.

[0012] At the positions corresponding to the countersunk threaded holes of the pressing plate 1 on the base 2, corresponding threaded counterbores 10 are provided, and at the positions corresponding to the positioning pin holes of the pressing plate 1, positioning pin holes 11 are provided.

[0013] The pressing plate 1 is positioned with the base 2 through the positioning pin 4 to ensure that the positions of the pressing plate 1 and the base 2 match the wave crests and wave troughs of the long wavy sheet and are clamped tightly; the bolt 3 is screwed into the threaded counterbores of the pressing plate 1 and the base 2 to clamp the long wavy sheet. The spring is installed in the larger section of the threaded counterbore 10 on the base 2, and when the bolt 3 is loosened, the spring jacks up the pressing plate 1.

[0014] Furthermore, grooves are machined on both end faces of the base 2 for clamping and fixing on the working table of the CNC milling machine.

[0015] Furthermore, the pressing plate 1 and the base 2 are machined from a single raw material by wire cutting. The waveforms and thicknesses of the removed parts in the middle are the same as those of the wavy gasket. The waveform between the pressing plate 1 and the base 2 can just fasten the long wavy sheet without causing deformation.

[0016] Furthermore, the positioning pin holes of the pressing plate 1 and the base 2 are on the same axis, ensuring that after the positioning pin 4 is inserted, the corresponding side faces of the pressing plate 1 and the base 2 are on the same plane, and the upper surface of the pressing plate 1 is parallel to the bottom surface of the base 2.

[0017] The beneficial effects of the present invention: The present invention adopts the CNC milling processing method to propose a CNC milling fixture for processing the outer shapes of multiple wavy gaskets in a single clamping. Two long wavy sheets can be clamped at one time, and the outer shapes and holes of multiple wavy gaskets can be processed. During the processing process, there is no situation that affects the processing efficiency such as re-threading, and the processing efficiency is greatly improved; and the fixture uses upper and lower pressing clamping, and the clamping is firm, and the qualified rate is greatly improved. Description of the Drawings

[0018] Figure 1It is a wavy gasket pattern, where (a) is the front view and (b) is the top view.

[0019] Figure 2 It is a schematic diagram of a long wavy sheet.

[0020] Figure 3 It is a schematic diagram of the overall structure of the fixture.

[0021] Figure 4 It is a schematic diagram of the structure of the pressure plate.

[0022] Figure 5 It is a schematic diagram of the structure of the base.

[0023] In the figure: 1 pressure plate; 2 base; 3 bolt; 4 positioning pin; 5 long wavy sheet; 6 positioning strip; 8 T-shaped groove; 9 T-shaped protruding structure; 10 threaded counterbore; 11 positioning pin hole; 12 positioning part. Specific implementation mode

[0024] The following further explains the specific implementation mode of the present invention in conjunction with embodiments and drawings, but is not used to limit the present invention.

[0025] Such as Figure 3 A CNC milling fixture for machining the outer shapes of multiple wavy gaskets in a single clamping, including a pressure plate 1, a base 2, a bolt 3, a positioning pin 4, a positioning strip 6 and a spring.

[0026] The pressure plate 1 is strip-shaped, and its bottom is wavy to match the outer shape of the clamped long wavy sheet. There are 8 threaded countersunk holes evenly distributed along the length direction in the middle part of the pressure plate 1, and 2 positioning pin holes are provided.

[0027] Multiple T-shaped grooves 8 are evenly opened along the length direction on both sides of the pressure plate 1 for the tool to have room to move when machining the outer shapes of the four sides of the wavy gasket by CNC milling. A T-shaped protruding structure 9 is formed between two adjacent T-shaped grooves 8, and there are two countersunk holes at the end of the T-shaped protruding structure 9. The small section size of the countersunk hole is slightly larger than the size of the hole required for machining the wavy gasket, and is used for machining the hole of the wavy gasket.

[0028] The base 2 is a cuboid structure, and its upper surface is wavy to match the outer shape of the clamped long wavy sheet; the wavy shape on the upper surface of the base 2 except for the clamping positions on both sides that cooperate with the pressure plate 1 and the middle position is removed for the tool to feed during CNC milling.

[0029] A positioning part 12 is formed at the clamping position where the base 2 cooperates with the pressure plate 1, and two holes slightly larger than the size of the hole required for machining the wavy gasket are opened at each positioning part 12; the length and width of the positioning part 12 are equal to the length and width of the wavy gasket.

[0030] The positioning strip 6 is a small rectangular strip, which is embedded between the wave-shaped and positioning parts 12 in the middle of the base 2 to position the long wave sheet.

[0031] The base 2 is provided with a corresponding threaded countersunk hole 10 at a position corresponding to the threaded countersunk hole of the pressing plate 1 , and a positioning pin hole 11 is provided at a position corresponding to the positioning pin hole of the pressing plate 1 .

[0032] The pressing plate 1 is positioned with the base 2 through the positioning pin 4 to ensure that the positions of the pressing plate 1 and the base 2 are matched with the crests and troughs of the long wave sheet and pressed tightly; the bolts 3 are screwed into the threaded countersunk holes of the pressing plate 1 and the base 2 to clamp the long wave sheet. The spring is installed in the larger section of the threaded countersunk hole 10 on the base 2, and the spring lifts the pressing plate 1 when the bolts 3 are loosened.

[0033] The long corrugated sheet processed by rolling should not have snake bends, and the width should be slightly larger than the width of the corrugated gasket, and the length should be longer than the total length of the fixture. The method of processing the long corrugated sheet using a CNC milling fixture is as follows:

[0034] (1) After the CNC milling fixture is assembled, it is fixed on the CNC milling machine bed through the grooves at both ends of the base 2 using the tools provided by the CNC milling machine;

[0035] (2) Loosen bolt 3, and the spring will lift up the pressure plate 1;

[0036] (3) Insert the long corrugated sheet 5 into the gaps on both sides of the pressing plate 1 and the base 2, and place it close to the positioning strip 6, and position it by the positioning strip 6;

[0037] (4) Tighten the bolt 3 to compress the long wave sheet 5;

[0038] (5) CNC milling of multiple wave-shaped gasket shapes and holes;

[0039] (6) Loosen bolt 3 and remove the processed wave-shaped gaskets one by one. The processing is completed.

Claims

1. A numerical control milling fixture for machining the outer shapes of multiple wavy gaskets in a single clamping, Characterized in that, The fixture includes a pressure plate (1), a base (2), bolts (3), positioning pins (4), positioning bars (6) and springs; The pressure plate (1) is strip-shaped, and its bottom is wavy to match the outer shape of the long wavy sheet to be clamped; there are 8 countersunk threaded holes evenly distributed along the length direction in the middle part of the pressure plate (1), and 2 positioning pin holes are provided; On both sides of the pressure plate (1), multiple T-shaped grooves (8) are evenly opened along the length direction; a T-shaped protruding structure (9) is formed between two adjacent T-shaped grooves (8), and there are two countersunk holes at the end of the T-shaped protruding structure (9) for machining the holes of the wavy gasket; The base (2) is a cuboid structure, and its upper surface is wavy to match the outer shape of the long wavy sheet to be clamped; the wavy shapes except for the clamping positions on both sides and the middle position that cooperate with the pressure plate (1) on the upper surface of the base (2) are removed for the cutter to feed during numerical control milling; Positioning parts (12) are formed at the clamping positions where the base (2) cooperates with the pressure plate (1), and two holes are opened at each positioning part (12); the length and width of the positioning part (12) are equal to the length and width of the wavy gasket; The positioning bar (6) is a small rectangular bar, which is embedded between the wavy shape in the middle position of the base (2) and the positioning part (12) to position the long wavy sheet; At the positions corresponding to the countersunk threaded holes of the pressure plate (1) on the base (2), corresponding threaded counterbores are provided, and at the positions corresponding to the positioning pin holes of the pressure plate (1), positioning pin holes are provided; The pressure plate (1) is positioned with the base (2) through the positioning pin (4) to ensure that the positions of the pressure plate (1) and the base (2) match the wave crests and wave troughs of the long wavy sheet and are clamped tightly; the bolts (3) are screwed into the threaded counterbores of the pressure plate (1) and the base (2) to clamp the long wavy sheet; the springs are installed in the threaded counterbores on the base (2), and the springs will jack up the pressure plate (1) when the bolts (3) are loosened.

2. The numerical control milling fixture according to claim 1, Characterized in that, The pressure plate (1) and the base (2) are processed from a piece of raw material by wire cutting, and the waveforms and thicknesses of the removed parts in the middle are the same as those of the wavy gasket.

3. The numerical control milling fixture according to claim 1 or 2, Characterized in that, The positioning pin holes of the pressure plate (1) and the base (2) are on the same axis.

4. The numerical control milling fixture according to claim 1 or 2, Characterized in that, Grooves are machined on both end faces of the base (2) for clamping and fixing on the workbench of the numerical control milling machine.

5. The numerical control milling fixture according to claim 3, Characterized in that, Grooves are machined on both end faces of the base (2) for clamping and fixing on the workbench of the numerical control milling machine.

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