CN116713779A - A clamp, clamping method and processing method for a complex profile thin-walled splash plate - Google Patents

Abstract

The invention discloses a complex-contour thin-wall splash guard clamp, a clamping method and a machining method, which belong to the field of machining and manufacturing and comprise a forward clamping tool and a reverse clamping tool; the splash guard is installed on the forward clamping tool to carry out forward clamping and positioning, and the splash guard is installed on the reverse clamping tool to carry out reverse clamping and positioning. The tool is used for solving the problems that parts are easy to deform and the dimensional tolerance of an outer circle cannot be guaranteed during mechanical processing in the prior art, designing two special tools for processing the small end face and the outer circle of the splash guard, and providing a specific mechanical processing positioning method, allowance removal times, removal amount and process route by combining the tools.

Description

A clamp, clamping method and processing method for a complex profile thin-walled splash plate

Technical field

The invention belongs to the field of mechanical processing and manufacturing, and specifically belongs to a clamp, a clamping method and a processing method for a complex profile thin-walled splash plate.

Background technique

The splash plate is a casting made of DD6 material. The inner hole axis of the part and the engine axis are at an angle of 5°46′. The part is required to have a machining outer circle dimensional tolerance within 0.07mm. According to the design structure and wool state of the part, only the large inner end surface and the inner hole surface of the wool can be positioned during machining, and placed at 5°46′. The splash plate is a thin-walled part (the wall thickness of the part surface is 2mm). Due to the complex contour of the fan-shaped conical surface at the large end, and the need to position the cast inner hole and the fan-shaped inner conical surface, the parts are easily deformed during machining, and the outer circle is subject to deformation. The influence of the contour of the sector-shaped inner cone surface changes irregularly, and it is difficult to ensure the dimensional tolerance of the outer circle during parts processing.

Contents of the invention

In order to solve the problems existing in the prior art, the present invention provides a clamp, a clamping method and a processing method for a complex profile thin-walled splash plate, which are used to solve the problem in the prior art that parts are easily deformed during machining and cannot guarantee the outer diameter. To solve the problem of tolerance, two special tooling were designed for the small end face and outer circle processing of the splash plate, and the specific machining positioning method, number and amount of excess removal, and process route were provided based on the tooling.

In order to achieve the above objects, the present invention provides the following technical solutions:

A fixture for thin-walled splash plates with complex contours, including a forward clamping tool and a reverse clamping tool;

The forward clamping tooling includes a base;

A positioning seat is provided at the center of the base, and inclined blocks are provided on both sides of the positioning seat;

The inclined block and the positioning seat have oppositely arranged inclined surfaces; a pressure plate is provided between the inclined block and the positioning seat, and inclined surfaces are provided at both ends of the pressure plate to match the inclined surfaces of the inclined block and the positioning seat; The center through hole of the pressure plate is equipped with equal-length double-headed studs. The equal-length double-headed studs pass through the pressure plate and are connected to the base. The tops of the equal-length double-headed studs are provided with star-shaped handles; equal-length double-headed studs The rotation drives the pressure plate downward to compress the splash plate axially;

A spring chuck is installed on the top of the positioning seat, and the spring chuck is used to contact the inner hole of the splash plate; a cone block is installed on the spring chuck; a mandrel is provided in the center of the positioning seat and the cone block, and the center of the mandrel is A first nut is provided on the top; the first nut, cone block, mandrel, and spring chuck are used for radial positioning of the splash plate;

Guide blocks are provided on both sides of the positioning seat, and a groove is provided in the center of the guide block. The angular block is installed inside the groove, and the angular block is slidably connected along the groove; the angular block is used to limit the splash plate. Angular and provide angular limiting pressing force;

The reverse clamping tooling includes a mounting base, a pressure plate and screws; the mounting base is in the shape of a stepped shaft; the mounting base is provided with an end face of the mounting base and a step face of the mounting base; the end face of the mounting base is reversely positioned and the splash plate is small On the end face, the step surface of the mounting seat is used to contact the inner hole of the splash shield, and the screws pass through the pressure plate to connect the mounting seat to fix the splash shield.

Preferably, the connection part between the pressure plate and the splash plate is provided with an elastic washer.

Preferably, the guide block is fixed on the base through a second hexagon socket screw, and a third cylindrical pin positions the guide block on the base.

Preferably, a cover plate is installed on the top of the guide block, and the cover plate is fixed above the groove of the guide block through slotted countersunk screws.

Preferably, a support block is installed on the outside of the guide block, and the support block is fixed on the base. A knurled round head compression screw is provided on the support block. The knurled round head compression screw passes through the support block and is connected to the angular block, and rotates The knurled round head compression screw drives the movement of the angular block.

Preferably, the positioning seat is fixed on the base through a first hexagonal cylindrical head screw, and the second cylindrical pin positions the positioning seat on the base;

The inclined block is fixed on the base through a second hexagon socket head screw, and the first cylindrical pin positions the inclined block on the base.

Preferably, the double-headed studs of equal length are connected to the base through the second nut through the pressure plate. The top of the double-headed studs of equal length is provided with a star-shaped handle. By rotating the star-shaped handle, the pressure plate is driven down to push down the splash plate. Axial compression.

Preferably, the positioning seat and the base are provided with a through hole, the bottom of the through hole is provided with a screw plug, the inside of the through hole of the positioning seat is provided with a pressure spring, the inside of the through hole of the positioning seat is provided with a pressure spring, and the top of the pressure spring Comes with support pins installed.

A forward clamping method for a complex profile thin-walled splash plate fixture, based on any one of the above described complex profile thin-walled splash plate fixtures, including the following steps:

Step 1: Place the splash plate on the positioning seat so that the conical profile of the splash plate fits the profile of the positioning seat;

Step 2: Place the spring collet in the inner hole of the splash plate, use the first nut to tighten the cone block, and rotate the nut installed on the mandrel to move the cone block downward, so that the spring collet expands and elastically positions On the surface of the inner hole of the wool material, perform radial positioning and clamping of the splash plate on the forward clamping tool;

Step 3: Push the angular blocks on both sides to fit the angular blocks on both sides with the two sides of the splash plate to perform angular positioning and angular limit compression of the parts;

Step 4: Press down the pressure plate to axially compress the splash plate and the large outer end surface of the splash plate, and the pressure plate provides axial pressing force;

Step 5: Adjust the screw plug and pressure spring to spring up the support pin and fit it into point contact with the conical surface of the splash plate to position the axial floating support.

A method for processing a complex profile thin-walled splash plate fixture, based on any of the above described complex profile thin-walled splash plate fixtures, including the following steps:

Step 1: Match the splash plate with the profile of the forward clamping tool in the complex contour thin-walled splash plate fixture.

Fit and perform forward clamping and positioning;

Step 2: Design the number and amount of machining allowance removals for the splash guard, clamp the parts in the forward direction, process the end face of the parts and process the outer circle of the parts;

Step 3: Process and control the flatness of the small end surface of the splash plate;

Step 4: Install the splash plate on the reverse clamping tool for reverse clamping and positioning;

Step 5: Position the parts according to reverse clamping, and use the precise positioning of the end face to remove the final margin of the splash plate parts.

Compared with the existing technology, the present invention has the following beneficial technical effects:

The invention provides a clamp for a thin-walled splash plate with complex contours. The clamp clamps the splash plate forwardly to ensure the axial size required by the design. At the same time, it realizes reliable clamping and positioning of thin-walled woolen parts with complex contours and ensures that the parts are The deformation of the wool material after positioning and disassembly is small. And through the datum conversion, the positioning of the wool fan-shaped conical surface is converted to the positioning of the processed small end face when turning the outer circle, ensuring that the positioning datum is flat and reliable when the parts are clamped in reverse, and the processing accuracy of the parts is ensured. The fixture reversely clamps the splash plate, positions it with a machined small end face, and presses the parts through a special profile pressure plate and a profile rubber gasket, which solves the problem of unreliable wool positioning for thin-walled parts with complex contours. Achieve part size tolerance control within 0.07mm.

In view of the structural characteristics and dimensional accuracy requirements of the splash-back plate, the present invention uses the fixture to clamp the splash-back plate in forward and reverse directions, uses the benchmark conversion method, cooperates with the reasonable number and amount of residual removals, and designs a reasonable process route, and finally Achieve machining of complex contours, wool positioning, and high-precision dimensions of thin-walled splash plates. The invention's ideas for fixture design, part clamping and positioning, positioning reference conversion, margin allocation and process route design provide examples for other complex contours, wool positioning, and thin-walled parts that need to be processed with high-precision dimensions, and have extremely high engineering practice Value.

Description of the drawings

Figure 1 is a front view of a forward clamping tool for a complex-profile thin-walled splash plate clamp according to the present invention.

Figure 2 is a schematic cross-sectional structural diagram of the front view A-A of the forward clamping tooling of a complex-profile thin-walled splash plate clamp according to the present invention.

Figure 3 is a schematic cross-sectional structural diagram of the front view B-B of the forward clamping tooling of a complex-profile thin-walled splash plate clamp according to the present invention.

Figure 4 is a schematic diagram of the forward clamping tool of a complex-profile thin-walled splash plate clamp according to the present invention for clamping the splash plate;

Figure 5 is a schematic diagram of the forward clamping tooling of a complex-profile thin-walled splash-back plate fixture of the present invention during installation of the splash-back plate;

Figure 6 is a schematic diagram of the completion of the installation of the splash plate by the forward clamping tool of a complex contour thin-walled splash plate clamp according to the present invention;

Figure 7 is a schematic structural diagram of the front view of a reverse clamping tool for a complex-profile thin-walled splash plate clamp according to the present invention.

Figure 8 is a schematic diagram of the forward clamping and positioning processing of the splash plate according to the forward clamping tool.

Figure 9 is a schematic diagram of the reverse clamping and positioning processing of the splash plate according to the reverse clamping tool.

Figure 10 is a schematic structural diagram of the splash plate axis view.

In the drawings: 1 is the base; 2 is the positioning seat; 3 is the positioning pin; 4 is the guide block; 5 is the angle block; 6 is the support block; 7 is the cover plate; 8 is the pressure plate; 9 is the pressure plate; 10 is the slope. block; 11 is a support pin; 12 is a spring collet; 13 is a cone block; 14 is the first nut; 15 is the mandrel; 16 is the first cylindrical pin; 17 is the second cylindrical pin; 18 is the third cylindrical pin; 19 is a screw plug; 20 is a star handle; 21 is a first hexagon socket head screw; 22 is a slotted countersunk head screw; 23 is a slotted cylindrical head screw; 24 is a first hexagon socket cylindrical head screw; 25 is a second socket head screw. Hexagonal cylinder head screw; 26 is the second nut; 27 is the second hexagon socket screw; 28 is the knurled round head compression screw; 29 is the equal-length double-headed stud; 30 is the pressure spring; 31 is the third hexagon socket cylinder 32 is the end surface of the mounting seat; 33 is the step surface of the mounting seat; 34 is the elastic washer; 35 is the pressure plate; 36 is the third nut; 37 is the screw.

Detailed ways

The present invention will be further described in detail below with reference to specific examples, which are explanations rather than limitations of the present invention.

Example

The present invention is a complex-contour thin-walled splash plate clamp, which includes a forward clamping tool and a reverse clamping device; the splash plate is installed on the forward clamping tool for forward clamping and positioning, and the splash plate is installed on the forward clamping tool. Perform reverse clamping and positioning on the reverse clamping tooling.

As shown in Figures 1 to 6, the forward clamping tooling includes a base 1, a positioning seat 2, a positioning pin 3, a guide block 4, and an angle block 5

Support block 6, cover plate 7, pressure plate 8, pressure plate 9, inclined block 10, support pin 11, spring collet 12, cone block 13, first nut 14, mandrel 15, first cylindrical pin 16, second cylindrical pin 17. Third cylindrical pin 18, screw plug 19, star handle 20, first hexagon socket head screw 21, slotted countersunk head screw 22, slotted cylinder head screw 23, first hexagon socket head screw 24, second socket head screw Hexagonal cylinder head screw 25, second nut 26, second hexagon socket head screw 27, knurled round head compression screw 28, equal length double-headed stud 29, pressure spring 30, third hexagon socket head screw 31.

The base 1, the inclined block 10, the positioning seat 2, the guide block 4 and the angle block 5 constitute the main base of the clamp.

A positioning seat 2 is provided at the center of the base 1, and inclined blocks 10 are provided on both sides of the positioning seat 2.

The positioning seat 2 is fixed on the base 1 through the first hexagon socket head screw 24, and the second cylindrical pin 17 positions the positioning seat 2 on the base 1.

The inclined block 10 is fixed on the base 1 through the second hexagon socket head screw 25 , and the first cylindrical pin 16 positions the inclined block 10 on the base 1 .

A spring chuck 12 is installed on the top of the positioning seat 2, and the spring chuck 12 is used to contact the inner hole of the splash plate; a cone block 13 is installed on the spring chuck 12;

The center of the positioning seat 2 and the cone block 13 is provided with a mandrel 15, and the top of the mandrel 15 is provided with a first nut 14; the first nut 14, the cone block 13, the mandrel 15, and the spring chuck 12 are used to protect the splash plate. Radial positioning.

The inclined block 10 and the positioning seat 2 have inclined surfaces arranged oppositely; the inclined surfaces of the inclined block 10 and the positioning seat 2 are provided with pressure plates 9, and the two ends of the pressure plate 9 are provided with inclined surfaces corresponding to the inclination of the inclined block 10 and the positioning seat 2 The surface is adapted; the center through hole of the pressure plate 9 is installed with an equal-length double-headed stud 29. The equal-length double-ended stud 29 passes through the pressure plate 9 and is connected to the base 1 through a second nut 26. The equal-length double-ended stud 29 A star-shaped handle 20 is provided on the top; the pressure plate 9, the star-shaped handle 20, and the double-headed studs 29 of equal length are connected with the base body and the inclined block 10 is used to provide a pressing force for the splash plate; the pressure plate is driven by rotating the star-shaped handle 20 9 Press down to tighten the splash plate axially.

The pressure plate 9, the star-shaped handle 20, and the equal-length double-headed studs 29 cooperate with the base body connection and the inclined block to provide a pressing force for the splash plate.

The other two sides of the positioning seat 2 are provided with guide blocks 4, and a groove is provided in the center of the guide block 4. The angular block 5 is installed inside the groove, and the angular block 5 is slidably connected along the groove.

The guide block 4 is fixed on the base 1 through the second hexagon socket screw 27 , and the third cylindrical pin 18 positions the guide block 4 on the base 1 .

A cover plate 7 is installed on the top of the guide block 4, and the cover plate 7 is fixed above the groove of the guide block 4 through slotted countersunk screws 22.

A support block 6 is installed on the outside of the guide block 4. The support block 6 is fixed on the base 1. The knurled round head compression screw 28 passes through the support block 6 and connects to the angle block 5. The knurled round head compression screw 28 is rotated to drive the angle block. Movement towards block 5. The angular block 5 and the knurled round head compression screw 28 can limit the angular direction of the splash plate and provide angular limiting pressing force.

A positioning pin 3 is installed on the inclined surface of the positioning seat 2; the positioning pin 3 is arranged between the two support pins 11; a through hole is provided on the positioning seat 2 and the base 1, and a screw plug 19 is provided at the bottom of the through hole. 2. A pressure spring 30 is provided inside the through hole. A pressure spring 30 is provided inside the through hole of the positioning seat 2. A support pin 11 is installed on the top of the pressure spring 30. A groove is provided on the side of the support pin 11. One end of the positioning seat 2 The support pin 11 is locked by the first hexagon socket screw 21 passing through the positioning seat 2 and abutting against the groove. The screw plug 19 and the pressure spring 30 can play a floating support role, and are then locked by the first hexagon socket screw 21 . The support pin 11 at one end of the positioning seat 2 is locked by a third hexagon socket head screw 31 passing through the positioning seat 2 and abutting against the groove.

As shown in Figure 7, the reverse clamping tooling includes a mounting base, an end surface of the mounting base 32, a step surface of the mounting base 33, an elastic washer 34, a pressure plate 35, a nut 36 and a screw 37;

The end surface 32 of the mounting seat, the step surface 33 of the mounting seat, the elastic washer 34, the pressure plate 35, the nut 36 and the screw 37 are used for reverse clamping and positioning of the splash plate.

The mounting seat is in the shape of a stepped shaft; the mounting seat is provided with a mounting seat end surface 32 and a mounting seat step surface 33.

Use the end face 32 of the mounting seat to reversely position the small end face of the splash backing plate. The step surface 33 of the mounting seat is used to contact the inner hole of the splash backing plate. The screw 37 passes through the pressure plate 35 to connect the mounting base to fix the splash backing plate; the nut 36 pairs the screw. 37 for fixation. An elastic washer 34 is provided at the connection part between the pressure plate 35 and the splash plate.

By using the elastic washer 34, the pressure plate 35 and the screw 37 to position the rear end surface of the splash plate, the axial positioning of the part is realized; the step surface 33 of the mounting seat is used to position the inner hole of the part to realize the radial positioning of the part.

The invention provides a forward clamping tool and a reverse clamping tool for the small end face and outer circle processing of the splash plate, and combines the tool with a specific machining positioning method, the number and amount of excess removal, and a process route.

As shown in Figures 8 to 10, the forward clamping method of a complex profile thin-walled splash plate clamp of the present invention includes the following steps:

Step 1. Place the splash plate on the fixture positioning seat 2, so that the conical profile of the splash plate fits the profile of the positioning seat.

Step 2: Place the spring collet in the inner hole of the splash plate, use nut 14 to manually tighten the cone block 13, and rotate the nut installed on the mandrel to move the cone block downward, so that the spring collet expands its elasticity. Position the surface of the inner hole of the wool material to realize the radial positioning and clamping of the splash plate on the tooling.

Step 3: Push the angular blocks 5 on both sides to fit the two angular blocks on both sides of the splash plate, and tighten the screws 28 to achieve angular positioning and angular limit compression of the parts.

Step 4: Control the two pressure plates by tightening the two star-shaped handles to compress the large outer end surface of the splash plate to provide axial compression force.

Step 5: Adjust the screw plug 19 and the pressure spring 30 to spring up the support pin and fit it into point contact with the conical surface of the splash plate, and tighten the hexagon socket screw to achieve axial floating support positioning.

The processing method of a complex profile thin-walled splash plate fixture of the present invention includes the following steps:

(1) The splash plate is forward clamped and positioned on the forward clamping tool:

The splash-shielding plate fits the positioning seat 2 of the forward clamping tooling. Since the axis of the positioning seat 2 and the axis of the base body have an angle of 5°46′, it can be ensured that the splash-shielding plate is in the same state when it is processed and assembled on the engine, that is, There is an angle of 5°46′ between the inner circle axis of the part and the engine axis.

Use the nut 14 to manually tighten the cone block 13, and rotate the nut installed on the mandrel to move the cone block downward, so that the spring collet expands and elastically positions the surface of the inner hole of the wool to realize the radial positioning of the splash plate on the tooling. Clamping.

Use knurled round head compression screws 28 to squeeze the angular blocks 5 on both sides for angular positioning of the parts and providing angular limiting compression force.

Use two star-shaped handles to tighten double-headed studs of equal length to control the pressure plate to compress the large outer end surface of the splash plate. This process provides axial compression force.

The axial floating support positioning can be achieved by adjusting the screw plug 19 and the pressure spring 30 and tightening the hexagon socket screws.

By rotating the nut installed on the mandrel, the cone block moves downward, so that the spring collet expands to elastically position the inner hole surface of the wool. The above process realizes the radial positioning and clamping of the splash plate on the tooling.

(2) Number of times and amount of design allowance removal:

DD6 material is a difficult-to-machine material with high hardness. The total margin after processing to the final size and accuracy is 5.6-5.7mm. The designed margin removal times are 9 times and the removal amount per single pass is 0.6mm. Through the above method, the cutting force generated during the machining process can be effectively reduced, and the deformation amount of the splash plate in the free state can be controlled. Follow step (1) to clamp the part, process the end face of the part and process the outer circle of the part, leaving a margin of 0.2-0.3mm.

(3) Control the flatness of the end face of the splash plate:

Use honing equipment to grind the small end surface of the splash plate, and control the flatness within 0.01-0.02mm.

(4) The splash plate is reversely clamped and positioned on the reverse clamping tool:

Use the end face of the mounting seat to reversely position the small end face of the splash plate, and use elastic washers, pressure plates and bolts to position the rear end face of the splash plate to achieve axial positioning of the part; use the step surface to position the inner hole of the part to achieve radial positioning of the part .

(5)Final remainder removal:

Follow step (4) to reversely clamp and position the part, and use the precise positioning of the end face to remove the final 0.2-0.3mm margin of the part. Ensure that the dimensional tolerance of parts is within 0.07mm.

(6) Splash plate processing process route:

The wool material has complex contour characteristics and is a splash plate for thin-walled parts. The dimensional accuracy of the processed end face is within 0.07mm. The processing process route used is as follows: forward clamping and positioning → car appearance → deburring → honing end face → reverse installation Clamp positioning → Car outer circle → Fluorescence detection → Inspection → Cleaning → Warehousing.

The forward clamping tooling of the present invention forwardly clamps the splash plate to ensure the axial size required by the design, while achieving reliable clamping and positioning of thin-walled woolen parts with complex contours, ensuring that the deformation of the parts after disassembly due to woolen positioning processing is small .

Through datum conversion, the invention converts the positioning of the wool fan-shaped conical surface into the positioning of the processed small end face when the car is outside the circle, ensuring that the positioning datum is flat and reliable when the parts are clamped in reverse, and the processing accuracy of the parts is ensured.

The reverse clamping tooling of the present invention uses a machined small end face to position the splash plate, and presses the parts through a special profile pressure plate and a profile rubber gasket to solve the problem of positioning the wool of thin-walled parts with complex contours. Unreliable problem, finally achieved part size tolerance control within 0.07mm.

In view of the structural characteristics and dimensional accuracy requirements of the splash-back plate, the present invention uses a forward clamping tool and a reverse clamping tool to clamp the splash-back plate forward and reverse, and uses a benchmark conversion method to coordinate the reasonable number of times and amount of residual removal. , coupled with a well-designed process route, finally achieve the machining of complex contours, wool positioning, and high-precision dimensions of thin-walled splash plates.

The invention's ideas for fixture design, part clamping and positioning, positioning reference conversion, margin allocation and process route design provide examples for other complex contours, wool positioning, and thin-walled parts that need to be processed with high-precision dimensions, and have extremely high engineering practice Value.

Claims (10)

1. The fixture for the thin-wall splash guard with the complex profile is characterized by comprising a forward clamping tool and a reverse clamping tool;

the forward clamping tool comprises a base (1);

a positioning seat (2) is arranged at the center of the base (1), and inclined blocks (10) are arranged on two sides of the positioning seat (2);

inclined surfaces which are oppositely arranged are arranged on the inclined block (10) and the positioning seat (2); a pressing plate (9) is arranged between the inclined block (10) and the positioning seat (2), and inclined surfaces are arranged at two ends of the pressing plate (9) and are matched with the inclined surfaces of the inclined block (10) and the positioning seat (2); the center through hole of the pressing plate (9) is provided with an equal-length double-end stud (29), the equal-length double-end stud (29) penetrates through the pressing plate (9) to be connected to the base (1), and the top of the equal-length double-end stud (29) is provided with a star-shaped handle (20); the equal-length double-end studs (29) rotate to drive the pressing plate (9) to press down so as to axially press the splash guard;

a spring chuck (12) is arranged at the top of the positioning seat (2), and the spring chuck (12) is used for contacting an inner hole of the splash guard; the collet chuck (12) is provided with a cone block (13); the center of the positioning seat (2) and the center of the cone block (13) are provided with a mandrel (15), and the top of the mandrel (15) is provided with a first nut (14); the first nut (14), the cone block (13), the mandrel (15) and the spring chuck (12) are used for radial positioning of the splash guard;

guide blocks (4) are arranged on two sides of the positioning seat (2), a groove is formed in the center of the guide blocks (4), the angle blocks (5) are arranged in the groove, and the angle blocks (5) are connected in a sliding mode along the groove; the angular block (5) is used for limiting the angular direction of the splash guard and providing an angular limiting pressing force;

the reverse clamping tool comprises a mounting seat, a pressing plate (35) and screws (37); the mounting seat is in a stepped shaft shape; the mounting seat is provided with a mounting seat end surface (32) and a mounting seat step surface (33); the mounting seat end face (32) reversely positions the small end face of the splash guard, the mounting seat step face (33) is used for contacting an inner hole of the splash guard, and the screw (37) penetrates through the pressing plate (35) to be connected with the mounting seat so as to fix the splash guard.

2. A complex-profile thin-walled splash guard fixture as claimed in claim 1, characterized in that the connection of the pressure plate (35) to the splash guard is provided with an elastic washer (34).

3. A complex-profile thin-walled splash guard fixture as claimed in claim 1, wherein the guide block (4) is fixed to the base (1) by means of a second socket head cap screw (27), and the third cylindrical pin (18) locates the guide block (4) on the base (1).

4. A complex-profile thin-walled splash guard fixture as claimed in claim 1, wherein a cover plate (7) is mounted on top of the guide block (4), the cover plate (7) being fixed over the guide block (4) recess by slotted countersunk screws (22).

5. The complex-profile thin-wall splash guard clamp according to claim 1, wherein a supporting block (6) is installed on the outer side of the guide block (4), the supporting block (6) is fixed on the base (1), a knurled round head pressing screw (28) is arranged on the supporting block (6), the knurled round head pressing screw (28) penetrates through the supporting block (6) to be connected with the angular block (5), and the angular block (5) is driven to move by rotating the knurled round head pressing screw (28).

6. The complex-profile thin-wall splash guard fixture as claimed in claim 1, wherein the positioning seat (2) is fixed on the base (1) through a first hexagonal socket head cap screw (24), and the second cylindrical pin (17) is used for positioning the positioning seat (2) on the base (1);

the inclined block (10) is fixed on the base (1) through a second hexagon socket head cap screw (25), and the first cylindrical pin (16) is used for positioning the inclined block (10) on the base (1).

7. A complex-profile thin-walled splash guard fixture as claimed in claim 1, wherein the equal-length studs (29) are connected to the base (1) by means of second nuts (26) penetrating through the pressure plates (9), star handles (20) are arranged at the tops of the equal-length studs (29), and the pressure plates (9) are driven to be pressed downwards by rotating the star handles (20) to axially compress the splash guard.

8. The complex-profile thin-wall splash guard clamp according to claim 1, wherein through holes are formed in the positioning seat (2) and the base (1), a screw plug (19) is arranged at the bottom of each through hole, a pressure spring (30) is arranged in each through hole of the positioning seat (2), and a supporting pin (11) is arranged at the top of each pressure spring (30).

9. A forward clamping method of a complex-profile thin-wall splash guard clamp, which is characterized in that the complex-profile thin-wall splash guard clamp based on any one of claims 1 to 8 comprises the following steps,

step 1, placing a splash guard on a positioning seat (2) to enable a conical profile of the splash guard to be attached to a profile of the positioning seat (2);

step 2, placing the collet chuck (12) in an inner hole of the splash guard, tightening the cone block (13) by using a first nut (14), and enabling the cone block (13) to move downwards by rotating the nut which is arranged in the mandrel (15), so that the collet chuck (12) expands the surface of the inner hole of the elastic positioning blank to radially position and clamp the splash guard on a forward clamping tool;

step 3, pushing the two side angle blocks (5) to enable the two side angle blocks (5) to be attached to two side surfaces of the splash guard, and carrying out part angle positioning and angle limiting compaction;

step 4, pressing down a pressing plate (9) to axially press the splash guard, pressing the large outer end face of the splash guard, and providing axial pressing force by the pressing plate (9);

and 5, adjusting the screw plug (19) and the pressure spring (30) to enable the supporting pin (11) to spring upwards, and attaching the supporting pin and the conical surface of the splash guard in a point contact mode to axially float and support and position.

10. A method for processing a complex-profile thin-wall splash guard fixture, characterized in that the complex-profile thin-wall splash guard fixture based on any one of claims 1 to 8 comprises the following steps,

step 1, attaching a splash guard to the molded surface of a forward clamping tool in a complex-contour thin-wall splash guard clamp, and performing forward clamping and positioning;

step 2, designing the machining allowance removal times and removal amounts of a splash guard, and machining the end face of the part and the excircle of the part according to forward clamping of the part;

step 3, processing and controlling the planeness of the small end face of the splash guard;

step 4, installing the splash guard on a reverse clamping tool for reverse clamping and positioning;

and 5, positioning the part according to reverse clamping, and removing the final allowance of the splash guard part by utilizing accurate positioning of the end face.