CN111716162A

CN111716162A - Thin-wall hollow slender shaft part grinding deformation control method

Info

Publication number: CN111716162A
Application number: CN201910997022.2A
Authority: CN
Inventors: 鲁攀; 保文成; 李均
Original assignee: AECC South Industry Co Ltd
Current assignee: AECC South Industry Co Ltd
Priority date: 2019-10-20
Filing date: 2019-10-20
Publication date: 2020-09-29
Anticipated expiration: 2039-10-20
Also published as: CN111716162B

Abstract

A method for controlling the grinding deformation of a thin-wall hollow slender shaft part comprises the following steps of A, preparing a mandrel according to the inner cavity profile of the thin-wall hollow slender shaft part, wherein the mandrel comprises a first rod body part, a second rod body part and a third rod body part which are sequentially connected, and step B, first rubber strips which are used for being sleeved on the first rod body part are respectively prepared according to the size of the mandrel, a second rubber strip sleeved on the second rod body part and a third rubber strip sleeved on the third rod body part, and step C, the core rod is plugged into the thin-wall hollow slender shaft part, and the distance between the end surface of the third rod body and the end surface of the second communicating hole is larger than 15mm, then the handle is disassembled, and the thin-wall hollow slender shaft part is arranged on a grinding machine to finish the grinding processing of the outer circular surface of the boss. The method for controlling the grinding deformation of the thin-wall hollow slender shaft part greatly improves the production efficiency.

Description

Thin-wall hollow slender shaft part grinding deformation control method

Technical Field

The invention relates to the technical field of machining, in particular to a method for controlling deformation during grinding of an outer circular surface of a boss of a shaft body of a thin-wall hollow slender shaft part.

Background

Fig. 1 is a schematic diagram of a schematic structural principle of a cross-sectional view of a thin-walled hollow slender shaft part for an aircraft engine, and as shown in fig. 1, this thin-walled hollow slender shaft part 1 includes a shaft body 11 with a wall thickness of 0.5mm, five circular-ring-shaped bosses 12 are welded on the shaft body 11, a first end fitting 13 and a second end fitting 14 are welded at two ends of the shaft body 11 respectively, and are close to the first end fitting 13, the bosses 12 are provided with a sealing ring 15 bonded with the shaft body 11, the first end fitting 13 is provided with a blind hole 131 communicated with an inner hole of the shaft body 11, the second end fitting 14 is sequentially provided with a first communicating hole 141 with the same inner hole diameter of the shaft body 11 and a second communicating hole 142 with a larger diameter, and a thin-walled section 143 with a wall thickness of 0.85mm is arranged on a side wall of the second communicating hole.

The outer diameter phi 1 of the shaft body 11 is 15mm, the length L1 is larger than 900mm, the overall length L2 of the thin-wall hollow slender shaft part 1 is larger than 990mm, the depth L3 of the blind hole 131 is 10mm, the length L4 of the thin-wall section 141 is larger than 40mm, the outer circular surface of the boss 12 is an arc surface with the radius R equal to 12mm, and the thickness L5 of the boss 12 is 5 mm.

In the production process, the outer disc of boss 12 need carry out abrasive machining, and the processing back, the outer disc of boss 12 is beated and is required to be not more than 0.038, because shaft body 11 and the draw ratio of thin wall hollow slender shaft part 1 has all exceeded 60, moreover the wall thickness of shaft body 11 is only 0.5mm, consequently, in current course of working, can only process with minimum abrasive machining parameter, and the course of working still need measure at any time in order to ensure the requirement of beating to make production efficiency extremely low.

In addition, because the wall thickness of the shaft body 11 is only 0.5mm, the sealing ring 15 is easy to deform in the grinding process to fall off, when the sealing ring 15 integrally falls off, the risk is easy to control, and when the sealing ring 15 is only separated from a local connecting position, the sealing ring is difficult to detect, so that great hidden danger can be caused to an aeroengine using the part.

Disclosure of Invention

The invention aims to solve the technical problem of providing a method for controlling the grinding deformation of a thin-wall hollow slender shaft part so as to reduce or avoid the problems.

In order to solve the technical problem, the invention provides a thin-wall hollow slender shaft part grinding deformation control method, wherein the thin-wall hollow slender shaft part comprises a shaft body with the wall thickness of 0.5mm, five annular bosses are welded on the shaft body, a first end piece and a second end piece are respectively welded at two ends of the shaft body, a sealing ring which is bonded with the shaft body is arranged on the boss close to the first end piece, the first end piece is provided with a blind hole which is communicated with an inner hole of the shaft body, the second end piece is sequentially provided with a first communicating hole with the same diameter as the inner hole of the shaft body and a second communicating hole with a larger diameter, and the side wall of the second communicating hole is provided with a thin-wall section with the wall thickness of 0.85 mm. The method is used for controlling the deformation of the thin-wall hollow slender shaft part when the outer circular surface of the boss is ground, and comprises the following steps,

step A, preparing a mandrel according to the inner cavity profile of the thin-wall hollow slender shaft part, wherein the mandrel comprises a first rod body part, a second rod body part and a third rod body part which are sequentially connected, the first rod body part is used for being inserted into the blind hole, the second rod body part is used for being inserted into the inner hole of the shaft body, and the third rod body part is used for being inserted into the second communicating hole,

the diameter of the first rod body part is 1.8mm smaller than that of the blind hole, the length of the first rod body part is 1.5mm longer than that of the blind hole, the top surface and the side wall of the first rod body part are provided with first grooves which are crossed,

the diameter ratio of second barrel portion the diameter of the hole of axle body is 2mm less, and length ratio the hole of axle body detach with behind the connection position of first end head spare with first through-hole length with 1mm long, second barrel portion with the terminal surface that first barrel portion is adjacent is provided with first annular of concentric and second annular, first annular sets up first barrel portion with the crossing department of second barrel portion, first annular with be provided with between the second annular four with the first connecting groove that first recess corresponds, the outer disc of second barrel portion is provided with first spiral groove, the both ends of first spiral groove are connected with the third annular respectively.

The diameter ratio of third barrel the diameter of second intercommunicating pore is 2mm less, and length ratio the length of second intercommunicating pore is 20mm less, the outer disc of third barrel is provided with second spiral groove, the both ends of second spiral groove are connected with the fourth annular respectively. And the end surface of the third rod body is provided with a threaded connecting hole for connecting a handle.

Step B, preparing a first rubber strip for being sleeved on the first rod body part, a second rubber strip for being sleeved on the second rod body part and a third rubber strip for being sleeved on the third rod body part according to the size of the mandrel,

the first rubber strip is provided with a cross part, a first annular part, a second annular part and a first communication part which are mutually connected corresponding to the first groove, the first annular groove, the second annular groove and the first communication groove respectively, the length dimension of each part of the first rubber strip is 1-2mm smaller than that of the corresponding groove respectively,

the second rubber strip and the third rubber strip are similar in structure and different in size, and the second rubber strip and the third rubber strip both comprise two circular rubber strips connected through a connecting rubber strip.

And sleeving the first rubber strip on the first rod body part, and respectively transferring the second rubber strip and the third rubber strip to the second rod body part and the third rod body part.

And step C, assembling a handle through the threaded connecting hole, plugging the mandrel into the thin-wall hollow slender shaft part, enabling the distance between the end face of the third rod body and the end face of the second communicating hole to be larger than 15mm, then dismounting the handle, and mounting the thin-wall hollow slender shaft part on a grinding machine to finish grinding of the outer circular surface of the boss.

Preferably, in step a, the mandrel is prepared using a super hard aluminium alloy 7075-T6, the heat treated state being solution ageing.

Preferably, in step B, the first rubber strip, the second rubber strip and the third rubber strip are all rubber strips with circular cross sections, which are manufactured by injection molding.

Preferably, in step B, the first rubber strip, the second rubber strip and the third rubber strip have a cross-sectional radius of 1.5 mm.

Preferably, in step a, the first groove and the first connecting groove are both provided with an arc surface with a radius of 1.5mm, and the arc length of the arc surface is 6/7-13/14 of the arc length of a semi-circle surface with a radius of 1.5 mm.

Preferably, in step a, the first and second ring grooves are each provided with a cross section inclined to the axis of the mandrel and may have a depth greater than 2/3 of the diameter of the first and second annular portions.

Preferably, in step B, the length dimension of each part of the first rubber strip is 1-2mm smaller than the length dimension of the corresponding groove.

Preferably, in step a, each of the first spiral groove and the second spiral groove is provided with an arc surface having a radius of 1.5mm, and an arc length of the arc surface is 6/7 to 13/14 of an arc length of a semicircular surface having a radius of 1.5 mm.

Preferably, in step B, the depth of the cross section of the third ring groove is not less than twice the radius of the cross section of the second rubber strip, and the depth of the cross section of the fourth ring groove is not less than twice the radius of the cross section of the third rubber strip.

Preferably, in step a, the third ring groove and the fourth ring groove are grooves having a sectional depth of 3 mm.

According to the method for controlling the grinding deformation of the thin-wall hollow slender shaft part, the specific mandrel is prepared according to the molded surface of the inner cavity of the part, and the rubber strip is arranged on the mandrel, so that the part is effectively supported, the integral rigidity of the part is enhanced, the deformation of the thin-wall part of the part during the clamping and grinding of a grinding machine is effectively controlled, the grinding parameters can be improved, the working hours required by grinding are greatly reduced, and the production efficiency is greatly improved. In addition, the risk of separation of the connection positions of the sealing rings is effectively controlled.

Drawings

The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein the content of the first and second substances,

FIG. 1 is a schematic cross-sectional structural view of a thin-walled hollow slender shaft part for an aircraft engine;

FIG. 2 is a schematic diagram of a method for controlling grinding deformation of a thin-walled hollow elongate shaft part according to an embodiment of the invention;

FIG. 3 is a schematic structural view of the mandrel of FIG. 2;

FIG. 4 is a schematic perspective view of the first blade portion and a portion of the second blade portion of FIG. 3;

FIG. 5 is a schematic view of the half-section structure of FIG. 4;

FIG. 6 is a schematic structural diagram of the first rubber strip of FIG. 2;

FIG. 7 is a schematic structural diagram of the second rubber strip (third rubber strip) in FIG. 2;

FIG. 8 is a schematic perspective view of the handle of FIG. 2;

fig. 9 is a schematic view of a partial cross-sectional structure of the first spiral groove of fig. 3 in a cross-sectional direction of an axis of the spiral direction.

Detailed Description

In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings. Wherein like parts are given like reference numerals.

FIG. 1 is a schematic cross-sectional structural view of a thin-walled hollow slender shaft part for an aircraft engine; FIG. 2 is a schematic diagram of a method for controlling grinding deformation of a thin-walled hollow elongate shaft part according to an embodiment of the invention; FIG. 3 is a schematic structural view of the mandrel of FIG. 2; FIG. 4 is a schematic perspective view of the first blade portion and a portion of the second blade portion of FIG. 3; FIG. 5 is a schematic view of the half-section structure of FIG. 4; FIG. 6 is a schematic structural diagram of the first rubber strip of FIG. 2; FIG. 7 is a schematic structural diagram of the second rubber strip (third rubber strip) in FIG. 2; FIG. 8 is a schematic perspective view of the handle of FIG. 2; fig. 9 is a schematic view of a partial cross-sectional structure of the first spiral groove of fig. 3 in a cross-sectional direction of an axis of the spiral direction. As shown with reference to figures 1-9,

the invention provides a thin-wall hollow slender shaft part grinding deformation control method, wherein the thin-wall hollow slender shaft part 1 comprises a shaft body 11 with the wall thickness of 0.5mm, five annular bosses 12 are welded on the shaft body 11, a first end head piece 13 and a second end head piece 14 are respectively welded at two ends of the shaft body 11, a sealing ring 15 which is bonded with the shaft body 11 is arranged on the boss 12 which is close to the first end head piece 13, the first end head piece 13 is provided with a blind hole 131 which is communicated with an inner hole of the shaft body 11, the second end head piece 14 is sequentially provided with a first communicating hole 141 with the same diameter as the inner hole of the shaft body 11 and a second communicating hole 142 with a larger diameter, and the side wall of the second communicating hole 142 is provided with a thin-wall section 143 with the wall thickness of 0.85 mm. Which is used for controlling the deformation of the thin-wall hollow slender shaft part 1 when the outer circular surface of the boss 12 is ground, and comprises the following steps,

step A, preparing a mandrel 2 according to the inner cavity profile of the thin-wall hollow slender shaft part 1, wherein the mandrel 2 comprises a first rod body part 21, a second rod body part 22 and a third rod body part 23 which are connected in sequence, the first rod body part 21 is used for being inserted into the blind hole 131, the second rod body part 22 is used for being inserted into the inner hole of the shaft body 11, the third rod body part 23 is used for being inserted into the second communicating hole 142,

the diameter of the first rod part 21 is 1.8mm smaller than that of the blind hole 131, the length L8 is 1.5mm longer than the length L3 of the blind hole 131, the top surface and the side wall of the first rod part 21 are provided with first grooves 211 which are crossed,

the diameter ratio of second barrel portion 22 the diameter of the hole of axle body 11 is 2mm less, and length L9 ratio the hole of axle body 11 remove with behind the connection position of first end head piece 13 with first through-hole 141 length sum L6 is 1mm long, second barrel portion 22 with the terminal surface that first barrel portion 21 is adjacent is provided with concentric first ring groove 221 and second ring groove 222, first ring groove 221 sets up first barrel portion 21 with the crossing department of second barrel portion 22, first ring groove 221 with be provided with four between the second ring groove 222 with first connecting groove 223 that first recess 211 corresponds, the outer disc of second barrel portion 22 is provided with first spiral recess 224, the both ends of first spiral recess 224 are connected with third ring groove 225 respectively.

The diameter of the third barrel 23 is 2mm smaller than that of the second communication hole 142, the length L10 is 20mm smaller than that L7 of the second communication hole 142, a second spiral groove 231 is formed on the outer circumferential surface of the third barrel 23, and fourth grooves 232 are connected to both ends of the second spiral groove 231. The end surface of the third barrel 23 is provided with a threaded connection hole 233 for connecting the handle 6.

Step B, respectively preparing a first rubber strip 3 for being sleeved on the first rod body part 21, a second rubber strip 4 for being sleeved on the second rod body part 22 and a third rubber strip 5 for being sleeved on the third rod body part 23 according to the size of the mandrel 2,

the first rubber strip 3 is provided with a cross part 31, a first annular part 32, a second annular part 33 and a first communication part 34 which are connected with each other corresponding to the first groove 211, the first ring groove 221, the second ring groove 222 and the first communication groove 223 respectively, the length dimension of each part of the first rubber strip 3 is 1-2mm smaller than that of the corresponding groove respectively,

the second rubber strip 4 and the third rubber strip 5 are similar in structure and different in size, and each comprises two circular rubber strips 42(52) connected through a connecting rubber strip 41 (51).

The first rubber strip 3 is sleeved on the first body part 21, and the second rubber strip 4 and the third rubber strip 5 are respectively transferred on the second body part 22 and the third body part 23.

And step C, assembling a handle 6 through the threaded connecting hole 233, plugging the mandrel 2 into the thin-walled hollow slender shaft part 1, enabling the distance between the end surface of the third rod body 23 and the end surface of the second communicating hole 142 to be larger than 15mm, then dismounting the handle 6, mounting the thin-walled hollow slender shaft part 1 on a grinding machine, and finishing grinding the outer circular surface of the boss 12.

According to the invention, the rigidity of the thin-wall hollow slender shaft part 1 is improved by inserting the through core rod 2 into the thin-wall hollow slender shaft part 1, specifically, the specific core rod 2 is prepared by corresponding to the characteristics of a cavity of the thin-wall hollow slender shaft part 1, and then the first rubber strip 3, the second rubber strip 4 and the third rubber strip 5 are assembled on the core rod 2, so that the core rod 2 can form effective rigid support for the thin-wall hollow slender shaft part 1, and the deformation of the thin-wall hollow slender shaft part 1 in the grinding process of the outer circular surface of the boss 12 is effectively controlled.

The mandrel 2 can be made of ultra-hard aluminum alloy 7075-T6, the heat treatment state is solid solution aging, the surface hardness can reach HRC60 after micro-arc oxidation, the weight of the mandrel 2 can be greatly reduced by adopting the material, and high rigidity is guaranteed;

the first rubber strip 3, the second rubber strip 4 and the third rubber strip 5 are all rubber strips with circular cross sections, and the rubber strips are made in an injection molding mode. The cross-sectional radii may be set the same, for example, both set to 1.5 mm.

Referring to fig. 9, in fig. 9, a schematic cross-sectional structure of the connection rubber strip 41 corresponding to the first spiral groove 224 is further shown, the first spiral groove 224 may be provided with an arc surface having the same radius R1 as the connection rubber strip 41, and when the arc surface of the first spiral groove 224 is too small, the adhesion force between the connection rubber strip 41 and the first spiral groove 224 cannot be ensured, and when the arc surface is too large, the connection rubber strip 41 is not easy to assemble, so that the arc surface of the first spiral groove 224 may not exceed the semicircular surface of the connection rubber strip 41, and the arc length of the arc surface of the first spiral groove 224 may be set to 6/7 to 13/14 of the arc length of the semicircular surface of the connection rubber strip 41.

The section radius of the second rubber strip 4 (i.e. the radius R1 of the connecting rubber strip 41) may be set to 1.5mm, so that after the connecting rubber strip 41 is tightly attached to the first spiral groove 224, the part of the connecting rubber strip 41 higher than the edge of the first spiral groove 224 is not less than 1.5mm after assembly, and thus after the mandrel 2 is installed in the thin-walled hollow slender shaft part 1, the mandrel body 11 can be effectively supported by the elastic deformation of the connecting rubber strip 41.

Similarly, the dimension relationship between the first spiral groove 224 and the connecting rubber strip 4 of the second rubber strip 4 can be set with reference to the dimension relationship between the first spiral groove 211 and the crisscross portion 31, between the first connecting groove 223 and the first connecting portion 34, and between the second spiral groove 224 and the connecting rubber strip 51 of the third rubber strip 5. That is, the first groove 211, the first communicating groove 223 and the second spiral groove 224 may also be provided with arc surfaces (for example, the radii of the arc surfaces are all set to 1.5mm) which are the same as the radius R1 of the communicating rubber strip 51 of the corresponding crisscross portion 31, the first communicating portion 34 and the third rubber strip 5, and the arc length of the arc surfaces may be set to 6/7 to 13/14 of the arc length of the corresponding semicircular surface (i.e., the semicircular surface with the radius of 1.5 mm).

The diameter of the first shaft part 21 is 1.8mm smaller than the diameter of the blind hole 131, and after the first rubber strip 3 is assembled, the portion of the cross 31 higher than the edge of the first groove 211 is not less than 1.5mm, this means that the top surface of the first shaft part 21 has at least a 1.5mm rubber part cushioning, so as to avoid the rigid contact between the top surface of the first rod-shaped part 21 and the bottom surface of the blind hole 131, the first grooves 211 are uniformly distributed on the side wall of the first rod-shaped part 21, this means that when inserted into the blind hole 131, the circumferentially equispaced portions of the first rubber strip 3 protruding out of the first recess 211 ensure the coaxiality of the first shaft portion 21 and the blind hole 131, and when the thin-wall hollow slender shaft part 1 is clamped on the grinding machine, the stress of the first end head piece 13 can be effectively transmitted to the mandrel 2.

The length L8 of first shaft part 21 is 1.5mm longer than the length L3 of blind hole 131, so that the end face of second shaft part 22 is prevented from coming into rigid contact with the end face of blind hole 131. In addition, the rubber part of the first communicating portion 34 protruding from the first communicating groove 223 can further ensure that the end surface of the second rod-shaped portion 22 is prevented from rigidly contacting the end surface of the blind hole 131.

The blind hole 131 is arranged in the deep cavity (the depth is more than 900mm) of the thin-wall hollow slender shaft part 1, in order to avoid the first rubber strip 3 from falling off during operation, the present invention provides a first ring groove 221 and a second ring groove 222 to ensure the stable structure of the first rubber strip 3, as shown in fig. 5, both the first groove 221 and the second groove 222 may be provided with a cross section inclined to the axis of the mandrel 2, and may have a depth greater than 2/3 of the diameters of the first and second

annular portions

32 and 33, this makes it possible to form a snap connection to the first rubber strip 3, and furthermore the length dimension of each part of the first rubber strip 3 is 1-2mm smaller than the length dimension of the corresponding groove, respectively, which means that after the first rubber strip 3 has been assembled, all parts are kept in a tensioning state, so that the connection stability of the first rubber strip 3 can be effectively guaranteed.

To facilitate the evacuation of the air from the cavity during the insertion of the mandrel 2, the third ring groove 225 and the fourth ring groove 232 may be set deeper, for example, the depth of the cross section may be not less than twice the radius of the cross section of the second rubber strip 4 (in particular, the ring rubber strip 42) and the third rubber strip 5 (in particular, the ring rubber strip 52). Thereby ensuring that the ring rubber strips 42 at the two ends of the second rubber strip 4 and the ring rubber strips 52 at the two ends of the third rubber strip 5 are not in contact with the inner cavity of the thin-wall hollow slender shaft part 1. For example, when the cross-sectional radii of the second rubber strip 4 and the third rubber strip 5 are set to 1.5mm, the third ring groove 225 and the fourth ring groove 232 may be grooves set to have a cross-sectional depth of 3 mm. This effectively retains the vent passage and facilitates insertion and removal of the mandrel 2.

For the second rubber strip 4, the inner diameter of the circular rubber strip 42 at the two ends of the second rubber strip can be set to be 1-2mm smaller than the diameter of the third circular groove 225, and the length of the connecting rubber strip 41 can be set to be slightly smaller than the length of the first spiral groove 224 on the spiral axis in the spiral direction (for example, 2-4mm shorter), so that after assembly, the second rubber strip 4 can also be subjected to tensile deformation, thereby ensuring the stable fit of the second rubber strip 4. The cross-sectional parameters of the third ring groove 225 can be as described with reference to fig. 9, i.e., can be configured to be identical to the first spiral groove 224.

Similarly, for the third rubber strip 5, the inner diameter of the annular rubber strips 52 at the two ends of the third rubber strip may be set to be 1-2mm smaller than the diameter of the fourth annular groove 232, and the length of the connecting rubber strip 51 may be set to be slightly smaller than the length of the second spiral groove 231 on the spiral axis in the spiral direction (for example, 2-4mm shorter), so that after assembly, the third rubber strip 5 may also be subjected to tensile deformation, thereby ensuring stable fitting of the third rubber strip 5. The cross-sectional parameters of the fourth ring groove 232 can be as shown in fig. 9, that is, can be set to be the same as the second spiral groove 231.

The first rubber strip 3, the second rubber strip 4 and the third rubber strip 5 can be coated with adhesive during assembly, so that the assembled connection can be further ensured to be stable through adhesion.

The diameter of the second shaft portion 22 is 2mm smaller than the diameter of the inner bore of the shaft body 11, and the length L9 is 1mm longer than the sum L6 of the length of the first communication hole 141 and the length of the inner bore of the shaft body 11 excluding the connection portion with the first head piece 13, so that the end surface of the third shaft portion 23 that is connected with the second shaft portion 22 does not rigidly contact with the bottom of the second communication hole 142 after the heart rod 2 is inserted in place.

The diameter of the third barrel 23 is 2mm smaller than the diameter of the second communication hole 142, and the length L10 is 20mm smaller than the length L7 of the second communication hole 142, so as to ensure that the elastic deformation of the third rubber strip 5 can be ensured, and the part of the connecting rubber strip 51 of the third rubber strip 5, which is higher than the edge of the second spiral groove 231, is not less than 1.5mm after the assembly, so as to ensure that the third barrel 23 can effectively support the thin-walled section 143, and ensure that the clamping force transmitted from the first head piece 13 side can be effectively transmitted to the rigid clamping part of the second head piece 14 (i.e. the rigid part of the second head piece 14 with a large wall thickness for clamping) when the thin-walled hollow slender shaft part 1 is clamped on the grinding machine. Thereby effectively avoiding the influence of clamping force on the shaft body 11 and the thin-wall section 143.

After the mandrel 2 is stuffed into the thin-wall hollow slender shaft part 1, the distance between the end surface of the third rod body 23 and the end surface of the second communicating hole 142 needs to be ensured to be larger than 15mm, so that on one hand, the interference of the clamping process on an ejector pin of a grinding machine can be avoided, and on the other hand, by controlling the distance between the end surface of the third rod body 23 and the end surface of the second communicating hole 142, at least most of the first rod body part 21 can be ensured to enter the blind hole 131, and therefore the transmission of clamping force is ensured.

When the technical scheme of the invention is applied, certain processing is usually required to be performed on the ejector pins of the grinding machine, for example, the standard ejector pins are subjected to tip removing operation, so that when the ejector pins at two ends clamp the first end piece 13 and the second end piece 14, the part entering the cavity does not exceed 10 mm.

The handle portion of the handle 6 may be provided with a mesh pattern so as to increase the frictional force during operation. Facilitating insertion and removal of the mandrel 2.

If the first spiral groove 224 is arranged too densely, the difficulty of inserting the mandrel 2 is increased by the excessive second rubber strip 4, and if the first spiral groove is arranged too sparsely, the supporting effect of the mandrel 2 on the shaft body 11 cannot be well guaranteed. The inventors have found through practice that a better implementation effect can be obtained when the inclination angle α of the first spiral groove 224 is set to 30 °.

Likewise, for the second spiral groove 231, the inclination angle may also be set to 30 °.

It should be appreciated by those of skill in the art that while the present invention has been described in terms of several embodiments, not every embodiment includes only a single embodiment. The description is given for clearness of understanding only, and it is to be understood that all matters in the embodiments are to be interpreted as including technical equivalents which are related to the embodiments and which are combined with each other to illustrate the scope of the present invention.

The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent alterations, modifications and combinations can be made by those skilled in the art without departing from the spirit and principles of the invention.

Claims

1. The utility model provides a hollow slender axles part grinding deformation control method of thin wall, a serial communication port, hollow slender axles part of thin wall includes the axle body of wall thickness 0.5mm, the welding has five annular bosss on the axle body, there are first end spare and second end spare at the both ends of axle body welded connection respectively, is close to first end spare the boss be provided with one with the sealing washer that the axle body bonded, first end spare be provided with the blind hole of the hole intercommunication of axle body, second end spare be provided with in proper order with the same first intercommunicating pore of the hole diameter of axle body and the second intercommunicating pore of bigger diameter, second intercommunicating pore lateral wall is provided with the thin wall section of wall thickness 0.85 mm. The method is used for controlling the deformation of the thin-wall hollow slender shaft part when the outer circular surface of the boss is ground, and comprises the following steps,

2. The method of claim 1, wherein in step a, the mandrel is prepared using an ultra-hard aluminum alloy 7075-T6, and the heat treated state is solution aging.

3. The method according to claim 2, wherein in step B, the first rubber strip 3, the second rubber strip 4 and the third rubber strip 5 are all rubber strips with a circular cross section made by injection molding.

4. A method according to claim 3, characterized in that in step B the cross-sectional radius of the first rubber strip 3, the second rubber strip 4 and the third rubber strip 5 is set to 1.5 mm.

5. The method of claim 1, wherein in step a, the first groove and the first connecting groove are each provided with an arc surface having a radius of 1.5mm, and an arc length of the arc surface is 6/7 to 13/14 of an arc length of a semicircular surface having a radius of 1.5 mm.

6. The method according to claim 1, characterized in that in step a, said first and second annular grooves are each provided with a section inclined to the axis of the mandrel and with a depth greater than 2/3 of the diameter of said first and second annular portions.

7. The method according to claim 1, wherein in step B, the length dimension of each portion of the first rubber strip is 1-2mm smaller than the length dimension of the corresponding groove.

8. The method of claim 1, wherein in step a, the first spiral groove and the second spiral groove are each provided with a cambered surface having a radius of 1.5mm, and an arc length of the cambered surface is 6/7 to 13/14 of an arc length of a semicircular surface having a radius of 1.5 mm.

9. The method of claim 8, wherein in step B, the depth of the cross section of the third ring groove is not less than twice the radius of the cross section of the second rubber strip, and the depth of the cross section of the fourth ring groove is not less than twice the radius of the cross section of the third rubber strip.

10. The method of claim 1 wherein, in step a, the third ring groove and the fourth ring groove are grooves having a cross-sectional depth of 3 mm.