CN212042785U

CN212042785U - Adjustable fine metering hole of accurate inclination adds clamping apparatus

Info

Publication number: CN212042785U
Application number: CN201922442577.9U
Authority: CN
Inventors: 吴建华; 张宝荣; 孙晓飞; 蒋立坤; 罗锦伟
Original assignee: STATE-RUN NO 616 FACTORY
Current assignee: STATE-RUN NO 616 FACTORY
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2020-12-01
Anticipated expiration: 2029-12-30

Abstract

The utility model discloses an adjustable fine metering hole machining fixture of accurate inclination, include: the base plate, the seat plate, the inner hexagonal cylindrical screw, the stop block, the slide valve embedded block, the positioning block and the locking handle; the bottom of the chassis is positioned on the basic disc through a spherical head screw; one side of the slide valve embedded block is provided with a slide valve to be processed, the other side of the slide valve embedded block is positioned on the positioning block, and the positioning block is locked on the chassis by the locking handle; the stop block is arranged on the other side of the slide valve to be processed and used for limiting the slide valve to be processed; the screwing length of the spherical head screw and the threaded hole of the chassis is adjusted, the inclination angle of the clamp is changed, and the machining of the inclined angle hole in the slide valve to be machined is met. The utility model has strong structure manufacturability, simple installation and easy guarantee of processing precision; the multifunctional drilling machine has the advantages that holes with various inclination angles of parts can be machined, and the utilization rate is high; the manufacturing precision is high.

Description

Adjustable fine metering hole of accurate inclination adds clamping apparatus

Technical Field

The utility model belongs to the technical field of machining, a adjustable fine metering hole machining anchor clamps of accurate inclination is related to.

Background

A new generation of armored assault equipment power system represented by a four-generation tank high-power density and amphibious high-speed diesel engine is the core of future army weaponry in China, and has the typical characteristics of high power density, high global maneuverability, large flow and ultrashort oil injection duration. With the gradual improvement of the level of army equipment in China, a new generation of armored assault equipment power system is inevitably required to select a high-pressure common rail oil supply system. The important index influencing the performance of the oil injector in the system is the response time of a core key part slide valve matching part to an electromagnetic valve, the electromagnetic valve cannot directly control the opening and closing of a needle valve matching part, the opening and closing of the needle valve is controlled through the slide valve matching part, and the opening and closing rate of the needle valve is determined by the flow rate ratio of an oil inlet metering hole and an oil outlet metering hole of the slide valve matching part. Therefore, the manufacturing technology of the slide valve matching parts is key for improving the basic capability of the process.

The slide valve coupling part consists of a slide valve shown in figure 1, a slide valve sleeve and a valve block shown in figure 2 and is mainly used for driving the needle valve coupling part to complete fuel injection under the driving of the electromagnetic valve according to the instruction of the ECU. The consistency of the machining precision of two valve parts of a slide valve oil inlet/outlet hole and a valve block oil inlet/outlet hole is not high, so that the consistency of the oil inlet/outlet quantity ratio of a slide valve coupling part is a main influence factor. The machining precision consistency of the oil inlet/outlet holes of the slide valve matching parts comprises two comprehensive indexes of consistency of diameters and related sizes (sizes) of micro metering holes (micropores) of a slide valve and a valve block (valve parts for short). Although the aperture consistency of the valve part processing micropores is realized by adopting an ultrasonic vibration process, the process needs a clamp to eliminate poor high-frequency rebound vibration force (hereinafter referred to as vibration force) caused by ultrasonic vibration, and the key for realizing the ultrasonic vibration micropore processing is to use the clamp with any structure and type to ensure the size consistency and effectively eliminate the vibration force.

In actual production, the technology of the micropore precision machining technology of the high-hardness material is weak. The process technology and experience of the traditional in-line pump matching part have no reference for the high-precision micro-hole machining of novel valve parts (a slide valve material 9CrWMn tool steel with the hardness requirement of 62-65 HRC, a valve block material W6Mo5Cr4V2 alloy steel with the hardness requirement of 62-66 HRC). Therefore, the more advanced international ultrasonic vibration clamping drill bit process technology is selected for carrying out the micro-hole machining of valve parts, but the machining defects appear when the following two clamps are selected according to the conventional experience:

the first method comprises the following steps: the combined clamp is divided into a groove system combined clamp and a hole system combined clamp, and most of the combined clamps widely used in China are groove system combined clamps at present. The groove system combined clamp is divided into three series according to the size of the bearing capacity: 16mm series of slots, 12mm series of slots and 8mm/6mm series of slots. According to the structure of the valve parts, a series of 8mm/6mm grooves is selected. When the micropores of valve parts are processed, the clamp is combined according to conventional experience: the base element is a circular base plate, the positioning element is a V-shaped support, and the pressing element is a flat pressing plate. An operator installs a valve part on a combined clamp to start an ultrasonic vibration instrument, a micro drill bit (hereinafter referred to as a drill bit) cuts a workpiece, the drill bit bears the cutting force and the vibration force generated by the contact of the rigid clamping surface because the workpiece is in contact with the rigid clamping surface of the combined clamp, the vibration and breaking frequency of the drill bit is increased and the drill bit is easy to break in a micropore, and no effective means can be taken out at present

The diameter drill bit does not damage the workpiece. Therefore, the conventional combined clamp is not suitable for the ultrasonic vibration micropore machining of valve parts.

And the second method comprises the following steps: the special fixture is designed according to different structures of valve parts. Although the special clamp has the characteristics of strong pertinence, compact structure, simple and convenient operation and high production efficiency, the special clamp has the following defects: the design and manufacture period is long, and the clamp can be scrapped as long as the size and the shape of the part are changed after the product is updated. The special fixture is designed according to the structure of the valve parts, so that the size consistency can be ensured, and a large amount of manpower and material resources are consumed due to extremely high manufacturing precision and long processing period. A large number of special fixtures are designed and used, so that the clamp is not suitable for the requirements of modern enterprises on development standardization, high efficiency, precision, flexibility and modularization of the clamps, and the actual conditions of the existing production are not met.

SUMMERY OF THE UTILITY MODEL

Objects of the invention

The utility model aims at: on one hand, the precision fixture is used for ensuring the consistency of the sizes of micropores of valve parts, eliminating bad vibration force to prevent a broken drill bit from providing technical support, realizing the technical indexes of the consistency of the oil inlet/outlet hole precision of a slide valve matching part and the like, and ensuring the high precision, high speed, high sensitivity and high reliability of the performance of the slide valve matching part; on the other hand increases anchor clamps inclination adjustable function, and the operator is quick flexible adjusts anchor clamps angle, carries out effective accurate clamping location, solves some small-size parts and is difficult with the problem in ordinary drilling machine processing space angle hole as shown in fig. 3, and the final purpose is to guarantee technical index such as slide valve idol advances/draining hole precision uniformity, promotes technology basic capability, breaks through slide valve idol key technology and makes.

(II) technical scheme

In order to solve the technical problem, the utility model provides an adjustable fine metering hole machining clamp of accurate inclination, it includes: the device comprises a base plate 1, a chassis 3, an inner hexagonal cylindrical screw 4, a stop block 5, a slide valve insert block 6, a positioning block 7 and a locking handle 8; the chassis 3 is of a columnar structure, a circular groove is formed in the lower portion of the chassis 3, a semicircular straight groove is formed in the upper portion of the chassis along the radial direction, two ends of the semicircular straight groove are arc-shaped and respectively provided with a first groove, a second groove and a third groove, the length and the width of the first groove, the second groove and the third groove are sequentially reduced, the third groove is communicated with the circular groove, a plurality of threaded holes which are uniformly distributed are formed in the bottom of the side wall of the chassis 3, spherical head screws are installed in the threaded holes, positioning grooves are formed in the base plate 1, and spherical heads of the spherical head screws are embedded; the slide valve insert 6 comprises a body block, an installation plate formed on one side of the body block and a positioning plate formed on the other side of the body block, a positioning hole is formed in the lower portion of the installation plate, a slide valve to be machined is positioned and installed on one side of the installation plate through the positioning hole, and a groove is formed between the positioning plate and the installation plate; the positioning block 7 comprises an upper block and a lower block, the lower block is embedded into the second groove, the end part of the second groove is provided with a threaded hole along the radial direction, the lower block is provided with a threaded groove, the locking handle 8 penetrates through the threaded hole from the outside and is connected with the threaded groove, the upper block is provided with a positioning groove, the positioning plate is embedded into the positioning groove, the side wall of the upper block at one side of the positioning groove is embedded into a groove between the positioning plate and the mounting plate, and the side wall of the upper block is made to be tightly attached to the; the upper part block of the positioning block 7 and the slide valve embedded block 6 are arranged in a first groove, the other side of the slide valve to be processed is provided with a stop block 5, the stop block 5 is positioned in the first groove and provided with a V-shaped groove, the stop block is blocked at the other side of the slide valve to be processed, the stop block 5 is provided with a threaded hole, an inner hexagonal cylindrical screw 4 sequentially passes through a third groove, a second groove and the first groove from bottom to top and is screwed into the threaded hole of the stop block 5, and the cylindrical head of the inner hexagonal cylindrical screw 4 is clamped at the bottom end face of the third groove; the screwing length of the spherical head screw and the threaded hole of the chassis 3 is adjusted, the inclination angle of the clamp is changed, and the machining of the inclined angle hole on the slide valve to be machined is met.

(III) advantageous effects

The precision inclination angle adjustable micro metering hole machining clamp provided by the technical scheme has the advantages that the deformation of the selected material is low, and the impact load performance is high; the assembly design structure has strong manufacturability, is simple to install and is easy to ensure the processing precision; the multifunctional drilling machine has the advantages that holes with various inclination angles of parts can be machined, and the utilization rate is high; the manufacturing precision is high, the manufacturing cost of the special fixture is saved, and the method conforms to the existing actual processing technology of a factory; the utility model discloses a slide valve advances/the draining hole, the valve block advances/the accurate location in draining hole, has improved the part machining precision uniformity, has ensured product quality.

Drawings

FIG. 1-schematic view of a slide valve; wherein, the A is a front view, the B is a right view, and the C is a left view.

FIG. 2-valve block diagram; wherein, the A is a front view, the B is a right view, and the C is a left view.

FIG. 3-middle pad diagram; wherein, the A is a front view, the B is a right view, the C is a bottom view, and the D is a top view.

4-1, 4-2, 4-3-Clamp mounting configurations bottom, front, top views.

Fig. 5-basic disc diagram, wherein, a is a front view and B is a bottom view.

Figure 6-slotted ball-head short screw diagram.

Figure 7-slotted spherical head long screw diagram.

FIG. 8-Chassis schematic; wherein, the A is a front view, the B is a left view, and the C is a top view.

FIG. 9-block diagram; wherein, the A is a front view, the B is a left view, and the C is a top view.

FIG. 10-schematic view of a cemented carbide insert; wherein, the A is a front view, the B is a left view, and the C is a top view.

Fig. 10-1-spool valve insert usage schematic.

FIG. 11-block diagram; wherein, the A is a front view, the B is a left view, and the C is a top view.

Fig. 12-locking handle diagram.

Detailed Description

In order to make the objects, contents, and advantages of the present invention clearer, the following description of the embodiments of the present invention will be made in detail with reference to the accompanying drawings and examples.

Referring to fig. 4-1 to 12, the clamp of the present invention comprises: the device comprises a base plate 1, a chassis 3, an inner hexagonal cylindrical screw 4, a stop block 5, a slide valve insert block 6, a positioning block 7 and a locking handle 8; the chassis 3 is of a columnar structure, a circular groove is formed in the lower portion of the chassis 3, a semicircular straight groove is formed in the upper portion of the chassis along the radial direction, two ends of the semicircular straight groove are arc-shaped and respectively provided with a first groove, a second groove and a third groove, the length and the width of the first groove, the second groove and the third groove are sequentially reduced, the third groove is communicated with the circular groove, a plurality of threaded holes which are uniformly distributed are formed in the bottom of the side wall of the chassis 3, spherical head screws are installed in the threaded holes, positioning grooves are formed in the base plate 1, and spherical heads of the spherical head screws are embedded; the slide valve insert 6 comprises a body block, an installation plate formed on one side of the body block and a positioning plate formed on the other side of the body block, a positioning hole is formed in the lower portion of the installation plate, a slide valve to be machined is positioned and installed on one side of the installation plate through the positioning hole, and a groove is formed between the positioning plate and the installation plate; the positioning block 7 comprises an upper block and a lower block, the lower block is embedded into the second groove, the end part of the second groove is provided with a threaded hole along the radial direction, the lower block is provided with a threaded groove, the locking handle 8 penetrates through the threaded hole from the outside and is connected with the threaded groove, the upper block is provided with a positioning groove, the positioning plate is embedded into the positioning groove, the side wall of the upper block at one side of the positioning groove is embedded into a groove between the positioning plate and the mounting plate, and the side wall of the upper block is made to be tightly attached to the; the upper part block of the positioning block 7 and the slide valve embedded block 6 are arranged in a first groove, the other side of the slide valve to be processed is provided with a stop block 5, the stop block 5 is positioned in the first groove and provided with a V-shaped groove, the stop block is blocked at the other side of the slide valve to be processed, the stop block 5 is provided with a threaded hole, an inner hexagonal cylindrical screw 4 sequentially passes through a third groove, a second groove and the first groove from bottom to top and is screwed into the threaded hole of the stop block 5, and the cylindrical head of the inner hexagonal cylindrical screw 4 is clamped at the bottom end face of the third groove; the screwing length of the spherical head screw and the threaded hole of the chassis 3 is adjusted, the inclination angle of the clamp is changed, and the machining of the inclined angle hole on the slide valve to be machined is met.

Four threaded holes are formed in the bottom of the side wall of the chassis 3, the length of each of the three threaded holes is larger than that of the fourth threaded hole, a slotted spherical head long screw 9 is arranged in each long threaded hole, and a slotted spherical head short screw 2 is arranged in each short threaded hole.

An annular concave platform is arranged at the bottom of the outer peripheral surface of the chassis 3 and used for providing a yielding space for the chassis 3 when the chassis is obliquely arranged.

The slotted spherical head short screw 2, the slotted spherical head long screw 9 and the chassis 3 belong to high-precision threads M8X1.5-4H4g for matching, the length of the slotted spherical head short screw 2, the slotted spherical head long screw 9 and the chassis 3 can be adjusted in screwing, and holes with different structure part inclination angles can be processed.

The slotted spherical head short screw 2 and the slotted spherical head long screw 9 are provided with a straight groove on the spherical heads for screwing the screws by using tools.

The stop block 5 is fixed in a semicircular straight groove 22 multiplied by 66.5 of the chassis 3 by an inner hexagonal cylindrical screw 4, so that the change of the processing position of a part is prevented, and a positioning effect is realized; the slide valve insert 6 is inserted into the transverse groove of the positioning block 7 after being provided with a slide valve, and is locked by the locking handle 8 to play a role in fixing and clamping. The stop block 5, the chassis 3, the slide valve embedded block 6, the positioning block 7 and the like are of hollow structures, so that the vibration force is dispersed and eliminated, and the drill bit breaking phenomenon is avoided.

Machining precision parameters of the basic disc 1: the material Cr 15; the hardness is 28-32 HRC; the processing machine tool selects a turning center, a high-precision vertical processing center and a high-precision numerical control surface grinding machine; reference surface of upper end surface of part, lower end surface of part and

the hole bottom plane parallelism is 0.01, and the verticality is 0

The surface roughness of the upper end surface is 0.4, and the surface roughness of the lower end surface is 0.8.

The processing precision parameters of the slotted spherical head short screw 2 and the slotted spherical head long screw 9 are as follows: the material 40 Cr; the machining tool selects a turning center and a high-precision numerical control four-axis grinding machine; the precision of the thread of the part is M8X1.5-4 g.

Machining precision parameters of the chassis 3: the material Cr 15; the hardness is 58-62 HRC; the machining machine tool selects a turning center, a high-precision vertical machining center, a high-precision numerical control surface grinding machine and a high-precision outer circle grinding machine. The reference surface of the excircle A of the part has the symmetry degree of 0.03 for 22 multiplied by 66.5 of the semicircular straight groove, 6 multiplied by 46 of the semicircular straight groove and 4 multiplied by 42 of the semicircular straight groove,

selection of coaxiality

The perpendicularity of the 2-M4 threaded hole is 0.04; the reference surface B of the lower end surface of the part is selected from a semicircular straight groove 22 multiplied by 66.5, a semicircular straight groove 6 multiplied by 46 and a semicircular straight groove 4 multiplied by 42 verticality

Parallelism is 0.02, 4-M8 is multiplied by 1.5-4H verticality

The surface roughness of the lower end surface is 0.4, and the surface roughness of the semicircular straight groove is 0.8.

Processing precision parameters of the stop block 5: material 18Cr2Ni4 WA; the hardness is more than or equal to 79 HRA; the processing machine tool selects a high-precision linear cutting machine, a high-precision vertical processing center, a high-precision numerical control angle grinder and a high-precision numerical control surface grinder; the symmetry degree of a V-shaped groove of the part is 0.01, the verticality is 0.02, and the surface roughness is 0.1.

The machining precision parameters of the hard alloy sliding valve insert 6 are as follows: material low-alloy wear-resistant steel WEL-TEN AR 360C; the hardness HB is more than or equal to 235-401; the processing machine tool selects a high-precision wire cutting machine, a high-precision numerical control surface grinding machine and an electric spark perforating machine; the symmetry degree of the part is 0.02, and the verticality is 0

Processing precision parameters of the positioning block 7: material 18Cr2Ni4 WA; the hardness is more than or equal to 79 HRA; the processing machine tool selects a high-precision wire cutting machine, a high-precision vertical processing center, a high-precision numerical control tool grinding machine and a high-precision numerical control surface grinding machine; selection of part verticality

The symmetry is 0.02, the parallelism is 0.02, and the surface roughness is 0.8.

As shown in figure 4-2, when processing valve parts, firstly, 1 slotted spherical head short screw 2 is installed in an axial threaded hole at the left end of a chassis 3, slotted spherical head long screws 9 are installed in the other three threaded holes, and then the slotted spherical head short screws are placed in a basic disk 1; secondly, inserting the part into the slide valve embedded block 6, positioning the positioning pin, pressing the part into the transverse groove of the positioning block 7, screwing the locking handle 8, and propping the bottom end face of the positioning hole of the positioning block 7 by the plane of the locking handle 8; and thirdly, an operator installs a stop block 5, determines that the machining center of the workpiece micropore coincides with the center of the ultrasonic vibration drill bit, and fixes the locking stop block 5 by using an inner hexagonal socket head cap screw 4. The operator starts the ultrasonic vibration instrument and the drill bit processes the part.

The V-shaped groove structure of the stop block 5 in the clamp adopts two stages, the diameter (1-8) mm of the part is positioned by an opening size V-shaped groove (9.5 +/-0.1) mm, and the diameter of the part is more than or equal to 8mm and is positioned by an opening size V-shaped groove (14.1 mm).

In this anchor clamps, the screw-thread fit M8X1.5-4H4g of chassis 3 and fluting spherical head short screw 2, fluting spherical head long screw 9, the tolerance precision belongs to: and (4) precision. The inclination angle of the clamp is adjusted, the screwing lengths of the slotted spherical head short screw 2 and the slotted spherical head long screw 9 are different, the inclination angles of the machining holes are different, the high precision of the thread screwing determines the high precision of the angle correction value, and the preset angle can be accurately and quickly obtained.

In the clamp, a hollow basic disc 1 is in contact with a high-precision machine tool workbench, a part micropore is processed by an ultrasonic vibration instrument, components such as a chassis guide vibration force to the basic disc, and the vibration force is eliminated by the hollow basic disc.

In the clamp, the stop block 5 is fixedly connected with the chassis 3 by the inner hexagonal cylindrical screw 4, the upper end surface of the stop block 5 is pressed, and the inner hexagonal cylindrical screw 4 is arranged from the chassis 3

The hole is screwed into the M2.5 threaded hole of the stop block 5, and the cylindrical head of the socket head cap screw 4 is clamped

The hole bottom end face is accurate in positioning and simple in operation. The basic disc 1 is removed, and the bottom surfaces of the four inner hexagonal cylindrical screws 4 can be placed in positioning grooves of a working platform of a common drilling machine, so that the processing of space holes of various parts can be realized.

According to the above technical scheme, the utility model has the following characteristics of showing:

1. and the size consistency of parts is ensured. The design angle precision requirement of the two-stage V-shaped groove of the positioning element stop block in the fixture is 60 degrees +/-2 degrees, the angle height of the positioning element stop block is consistent with that of a valve part, the symmetry precision requirement is 0.01, the positions of two contact points of the part are prevented from being inconsistent, and the perpendicularity is 0.02, so that the machined surface of the part is perpendicular to a drill bit. The handle is locked after the part is compressed by the compressing element hard alloy insert block, the hard alloy insert block is made of low-alloy wear-resistant steel WEL-TEN AR360C, the alloy material is well known for high strength and toughness and small bearing deformation, and the part is ensured to be firmly positioned and locked.

2. The parts are clamped quickly, products are replaced in time, and production efficiency is improved. The clamp locking element positioning block and the locking handle are in threaded screwing connection, an operator replaces a part positioning block to slide and move backwards, the locking handle is in threaded screwing connection to tightly press the positioning block, the distance of the machining dimension of a workpiece does not need to be repeatedly measured, and the part is clamped simply and quickly.

3. The clamp has a hollow structure design, is strong in manufacturability and effectively eliminates the vibration force. The contact of the parts and the positioning reference plane of the clamp is designed to be in multi-point contact with the mother bus, so that the vibration force is effectively eliminated, and the drill bit is prevented from shaking and breaking.

4. The usability is good, the operation of adjusting the space angle is simple, and the operation is safe and labor-saving. The clamp clamps parts in the hole with the spatial inclination angle, the angle is adjusted rapidly and effectively, and four screws at the lower end of the chassis are screwed. Taking the middle pad (fig. 3) as an example: firstly, parts are arranged in a stop block, a hard alloy insert block (figure 10) and a positioning block, then a handle is locked, and then the adjustment steps of chassis screws are as follows: firstly, screwing out a long screw (hereinafter referred to as a long screw) with a slotted spherical head at the right end in the axial direction, wherein the axial angle reaches 17.5 degrees; secondly, screwing out a longitudinal long screw at the rear end, wherein the axial angle reaches 2.4 degrees; and thirdly, screwing out the longitudinal long screws at the front end until the three long screws and the short screws with the spherical heads and slotted at the left end of the shaft (hereinafter referred to as short screws) are in the same plane, and finishing the angle adjustment.

5. The economy is good, and the chip removal is convenient. The utility model belongs to a multifunctional adjustable clamp which can be used in the processing of a plurality of part holes, reduces the design of a special clamp, reduces the manufacturing labor amount and the manufacturing cost of the special clamp and obtains higher economic benefit; meanwhile, the components such as the chassis adopt a hollow structure for chip removal, and the chip removal is timely and convenient

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be considered as the protection scope of the present invention.

Claims

1. The utility model provides an adjustable fine metering hole of accurate inclination adds clamping apparatus which characterized in that includes: the device comprises a base plate (1), a chassis (3), an inner hexagonal cylindrical screw (4), a stop block (5), a sliding valve insert block (6), a positioning block (7) and a locking handle (8); the chassis (3) is of a columnar structure, a circular groove is formed in the lower portion of the chassis, a semicircular straight groove is formed in the upper portion of the chassis along the radial direction, two ends of the semicircular straight groove are arc-shaped and respectively provided with a first groove, a second groove and a third groove, the length and the width of the first groove, the second groove and the third groove are sequentially reduced, the third groove is communicated with the circular groove, a plurality of threaded holes which are uniformly distributed are formed in the bottom of the side wall of the chassis (3), spherical head screws are installed in the threaded holes, a positioning groove is formed in the base plate (1), and spherical heads of the spherical head screws are embedded into the positioning groove; the slide valve embedded block (6) comprises a body block, an installation plate formed on one side of the body block and a positioning plate formed on the other side of the body block, a positioning hole is formed in the lower portion of the installation plate, a slide valve to be machined is positioned and installed on one side of the installation plate through the positioning hole, and a groove is formed between the positioning plate and the installation plate; the positioning block (7) comprises an upper block and a lower block, the lower block is embedded into the second groove, the end part of the second groove is provided with a threaded hole along the radial direction, the lower block is provided with a threaded groove, the locking handle (8) penetrates through the threaded hole from the outside and is connected with the threaded groove, the upper block is provided with a positioning groove, the positioning plate is embedded into the positioning groove, the side wall of the upper block at one side of the positioning groove is embedded into a groove between the positioning plate and the mounting plate, and the side wall of the upper block is enabled to be tightly attached to the; the upper part block and the sliding valve embedded block (6) of the positioning block (7) are arranged in the first groove, a stop block (5) is arranged on the other side of the sliding valve to be processed, the stop block (5) is positioned in the first groove, a V-shaped groove is formed in the first groove, the stop block is arranged on the other side of the sliding valve to be processed, a threaded hole is formed in the stop block (5), an inner hexagonal cylindrical screw (4) sequentially penetrates through the third groove, the second groove and the first groove from bottom to top and is screwed into the threaded hole of the stop block (5), and a cylindrical head of the inner hexagonal cylindrical screw (4) is clamped on the bottom end face of the third; the screwing length of the spherical head screw and the threaded hole of the chassis (3) is adjusted, the inclination angle of the clamp is changed, and the machining of the inclined angle hole on the slide valve to be machined is met.

2. The fine metering hole machining fixture with the adjustable precise inclination angle as claimed in claim 1, wherein the bottom of the side wall of the chassis (3) is provided with four threaded holes, the length of three threaded holes is greater than that of the fourth threaded hole, a slotted spherical head long screw (9) is arranged in a long threaded hole, and a slotted spherical head short screw (2) is arranged in a short threaded hole.

3. The fine metering hole machining fixture with the adjustable precise inclination angle as claimed in claim 2, wherein an annular concave platform is formed at the bottom of the outer peripheral surface of the base plate (3) and used for providing a yielding space for the base plate (3) when the base plate is obliquely arranged.

4. The fine metering hole machining fixture with the adjustable precise inclination angle as claimed in claim 3, wherein the slotted spherical head short screw (2) and the slotted spherical head long screw (9) are provided with straight slots on the spherical heads for screwing the screws by using a tool.

5. The precision tilt angle adjustable micro metering hole machining fixture according to claim 4, wherein the base plate (1) is arranged on a machine tool table, and a through hole is formed in the center of the base plate, so that machining vibration force is eliminated through the through hole.

6. The fine metering hole processing clamp with the adjustable precise inclination angle as claimed in claim 5, wherein the V-shaped groove structure on the stop block (5) is provided with two stages, and when the diameter of the slide valve to be processed is 1 mm-8 mm, the slide valve is positioned by 9.5mm of the V-shaped groove with the opening size; when the diameter of the part is more than or equal to 8mm, the part is positioned by a V-shaped groove with the opening size of 14.1 mm.

7. The fine metering hole machining fixture with the adjustable precise inclination angle as claimed in claim 6, wherein the base plate (1) is made of Cr15 with hardness of 28-32 HRC; the slotted spherical head short screw (2) and the slotted spherical head long screw (9) are made of 40Cr materials.

8. The fine metering hole machining fixture with the adjustable precise inclination angle as claimed in claim 7, wherein the base plate (3) is made of Cr15 with hardness of 58-62 HRC.

9. The fine metering hole machining fixture with the adjustable precise inclination angle as claimed in claim 8, wherein the stop block (5) is made of 18Cr2Ni4WA with hardness not less than 79 HRA; the material of the positioning block (7) is 18Cr2Ni4WA, and the hardness is more than or equal to 79 HRA.

10. The fine metering hole machining fixture with the adjustable precise inclination angle as claimed in claim 9, wherein the slide valve insert (6) is made of low-alloy wear-resistant steel WEL-TEN AR360C with hardness HB being more than or equal to 235-401.