Adjustable internal expansion mandrel clamp for sleeve part machining and using method of adjustable internal expansion mandrel clamp

Abstract

The invention discloses an adjustable internal expansion mandrel clamp for machining sleeve parts and a using method of the adjustable internal expansion mandrel clamp, and belongs to the technical field of part clamps. The outer side of the mandrel is sleeved with a clamping spring body and a clamping spring, the rear end of the clamping spring is inserted into the clamping spring body, the clamping spring is fixedly connected with the clamping spring body in a limiting mode, the outer wall of the clamping spring body is in threaded connection with a nut in a screwed mode, and cylindrical limiting pins are inserted into the nut, the clamping spring body and the mandrel. The nut is adjusted through the wrench to drive the mandrel to move to achieve size tensioning adjustment so as to clamp parts with different diameter sizes, operation is convenient and fast, rapid clamping of sleeve type parts is achieved, the machining efficiency of the parts is improved, and the cost for customizing the sized mandrel or the sized soft claw and the pressure of tool inventory are reduced. Meanwhile, the 29-degree trapezoidal threads are adopted for adjustment, so that the core shaft is effectively prevented from loosening after the size is adjusted, and the clamping stability is ensured.

Description

Technical Field

[0001] The invention relates to an adjustable inner expansion mandrel fixture for sleeve-type parts processing and a use method thereof, belonging to the technical field of parts fixtures. Background Art

[0002] In the turning process of sleeve parts, in order to ensure machining accuracy and efficiency, fixed-size mandrels or fixed-size soft jaws are usually used for clamping. This method performs well in mass production of single-model parts and can ensure production consistency and efficiency. However, in the current aviation machining companies, the market environment has changed significantly, market competition is increasingly fierce, and the production model has gradually shifted to a state dominated by small batches and multiple models. This change in production mode has brought new challenges to the processing of sleeve parts.

[0003] Specifically, undertaking the processing tasks of various sets of parts means that the company needs to prepare a large number of special fixtures to meet the clamping needs of different parts. This not only increases the inventory pressure of special fixtures, but also leads to an increase in consumables such as turning soft jaws, thereby increasing production costs. In order to solve this problem, the company urgently needs to develop a universal mandrel fixture that can be applied to a variety of set parts to reduce tooling consumption and inventory pressure.

[0004] However, there are two major technical difficulties in the development of universal mandrel fixtures:

[0005] First of all, the universal mandrel fixture needs to meet the use requirements of different types of sleeve parts, including through-sleeve parts and non-through-sleeve parts. Due to the different structural characteristics and use requirements of these two types of parts, the universal mandrel fixture needs to have sufficient flexibility and adaptability to ensure stable and accurate clamping in various situations.

[0006] Secondly, after adjusting the diameter of the universal mandrel, the universal mandrel fixture must solve the problem of dimensional instability caused by the looseness of the adjustment mechanism. Since the adjustment of the mandrel diameter is the key to the versatility of the universal mandrel fixture, the stability and reliability of the adjustment mechanism are crucial. Once the adjustment mechanism becomes loose, it will cause the mandrel diameter to change, which will affect the processing accuracy and part quality.

[0007] Therefore, an adjustable inner expansion mandrel fixture for sleeve-type parts processing is urgently needed to solve the above-mentioned technical problems. Summary of the invention

[0008] In order to solve the problems existing in the background technology, the present invention provides an adjustable inner expansion mandrel fixture for sleeve-type parts processing and a use method thereof.

[0009] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: an adjustable internal expansion mandrel clamp for sleeve-type parts processing, comprising a clamp spring body, a cylindrical limit pin, a nut, a clamp spring and a mandrel; the outer side of the mandrel is sleeved with a clamp spring body and a clamp spring, the rear end of the clamp spring is inserted into the interior of the clamp spring body and the clamp spring is fixedly connected to the clamp spring body in a limited manner, the outer wall of the spring body is screwed to the nut thread, and a cylindrical limit pin is inserted into the nut, the clamp spring body and the mandrel.

[0010] The core shaft comprises a coaxially arranged shaft rod and a conical shaft head, and the shaft rod is radially penetrated by a plug hole 1.

[0011] The clamp spring includes a circular ring body and a plurality of elastic sheets, wherein the plurality of elastic sheets are arranged along the circumference of the circular ring body and an opening is provided between every two adjacent elastic sheets, the inner wall of each elastic sheet is a wedge-shaped surface, the circular ring body is sleeved on the outer side of the shaft rod, the plurality of elastic sheets are sleeved on the outer side of the conical shaft head and the wedge-shaped surfaces of the plurality of elastic sheets are matched with the conical surface of the conical shaft head; the outer wall of the circular ring body is provided with a positioning hole one which passes through its inner wall along its radial direction.

[0012] The middle part of the clamp spring body is provided with an installation hole axially extending through it, the middle part of the clamp spring body is provided with a second insertion hole radially extending through it, and the outer wall of the clamp spring body is provided with a second positioning hole radially extending through its inner wall; the core shaft and the clamp spring are inserted into the installation hole, and the clamp spring body and the clamp spring are fixedly connected by inserting a positioning pin into the second positioning hole and the first positioning hole.

[0013] The inner wall ring of the nut is provided with an inner ring groove in the circumferential direction, and the inner ring groove is provided with two sockets three penetrating the outer wall of the nut along the radial direction of the nut, the two sockets three are relatively concentrically arranged, and the socket three, the socket two and the socket one are correspondingly arranged, and the cylindrical limit pin is inserted in the socket three, the socket two and the socket one.

[0014] The outer wall of the nut is also provided with a blind hole, and the blind hole is used in conjunction with a wrench.

[0015] The threads for screwing together the inner wall of the nut and the outer wall of the spring body are both 29° trapezoidal threads.

[0016] The present invention discloses a method for using an adjustable inner expansion mandrel fixture for sleeve-type parts processing, the method comprising the following steps:

[0017] S1: The parts to be processed are mounted on the outside of multiple elastic sheets;

[0018] S2: Clamp the wrench into the blind hole on the outer wall of the nut, and rotate the wrench to drive the nut to move toward the tail end of the mandrel;

[0019] S3: The inner ring groove of the nut pushes the cylindrical limit pin to move;

[0020] S4: The cylindrical limit pin drives the mandrel to move;

[0021] S5: The conical shaft head of the mandrel spreads out a plurality of elastic sheets so that the plurality of elastic sheets fit with the inner diameter of the workpiece to be processed, thereby fixing the workpiece to be processed.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The invention uses a wrench to adjust the nut to drive the mandrel to move and achieve size tension adjustment to clamp parts of different diameters. The operation is convenient, and the sleeve parts are quickly clamped, which improves the processing efficiency of the parts and reduces the cost of custom-made mandrels or soft jaws and the pressure of tooling inventory. At the same time, the 29° trapezoidal thread adjustment effectively prevents the mandrel from loosening after the size is adjusted, ensuring the stability of the clamping. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the structure of the mandrel;

[0026] Figure 3 It is a schematic diagram of the structure of the clamp spring;

[0027] Figure 4 It is the front view of the clip spring;

[0028] Figure 5 It is a structural schematic diagram of the clamp spring body;

[0029] Figure 6 It is a structural diagram of a nut;

[0030] Figure 7 It is a schematic diagram of the structure of a wrench. DETAILED DESCRIPTION

[0031] The technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0032] An adjustable internal expansion mandrel clamp for sleeve-type parts processing, comprising a clamp spring body 1, a cylindrical limit pin 2, a nut 3, a clamp spring 5 and a mandrel 6; the mandrel 6 is made of T7A material, and the outer side of the mandrel 6 is sleeved with the clamp spring body 1 and the clamp spring 5, the rear end of the clamp spring 5 is inserted into the interior of the clamp spring body 1, and the clamp spring 5 and the clamp spring body 1 are fixedly connected by a positioning pin 4, the clamp spring body 1 is made of 45 steel material, the outer wall of the spring body 1 is threadedly connected with the nut 3, and a cylindrical limit pin 2 is inserted into the nut 3, the clamp spring body 1 and the mandrel 6. The cylindrical limit pin 2 is made of CrWMn material with a hardness of HRC50-55, which not only ensures the bending resistance of the cylindrical limit pin 2 but also takes into account the wear resistance.

[0033] The core shaft 6 includes an integrally formed coaxially arranged shaft rod 601 and a conical shaft head 602, and a plug hole 603 is radially provided through the shaft rod 601.

[0034] The clamp spring 5 includes an integrally formed annular body 501 and a plurality of elastic sheets 502, wherein the plurality of elastic sheets 502 are evenly distributed along the circumference of the annular body 501 and an opening 503 is provided between every two adjacent elastic sheets 502, and the inner wall of each elastic sheet 502 is a wedge-shaped surface 504, the annular body 501 is sleeved on the outer side of the shaft rod 601, the plurality of elastic sheets 502 are sleeved on the outer side of the conical shaft head 602 and the wedge-shaped surfaces 504 of the plurality of elastic sheets 502 are matched with the conical surface of the conical shaft head 602; the outer wall of the annular body 501 is provided with a positioning hole 505 penetrating its inner wall along its radial direction.

[0035] A mounting hole 101 is axially provided in the middle of the clamp spring body 1, a second insertion hole 102 is radially provided in the middle of the clamp spring body 1, and a second positioning hole 103 is radially provided on the outer wall of the clamp spring body 1 and passes through its inner wall; a core shaft 6 and a clamp spring 5 are inserted into the mounting hole 101, and the clamp spring body 1 and the clamp spring 5 are fixedly connected in a limited position by inserting the positioning pin 4 into the second positioning hole 103 and the first positioning hole 505.

[0036] The inner wall ring of the nut 3 is circumferentially provided with an inner ring groove 301, and the inner ring groove 301 is provided with two sockets three 302 penetrating the outer wall of the nut 3 along the radial direction of the nut 3, the two sockets three 302 are relatively concentrically arranged, and the socket three 302, the socket two 102 and the socket one 603 are correspondingly arranged, and the cylindrical limit pin 2 is inserted into the socket three 302, the socket two 102 and the socket one 603.

[0037] The outer wall of the nut 3 is further provided with a blind hole 303 , and the blind hole 303 is used in conjunction with the wrench 7 .

[0038] The threads of the inner wall of the nut 3 and the outer wall of the spring body 1 are both 29° trapezoidal threads, which can effectively ensure that the nut 3 and the clamp spring body 1 are loosened from each other, thereby achieving the purpose of internal expansion and clamping parts.

[0039] After the present invention is assembled, the outer diameter of the elastic sheet 502 of the clamp spring 5 is required to have a perpendicularity of 0.03 to the outer diameter of the handle of the clamp spring body 1; the tensioning end of the clamp spring body 1 is required to have a coaxiality of 0.08 to the outer diameter of the handle of the clamp spring body 1.

[0040] The present invention discloses a method for using an adjustable inner expansion mandrel fixture for sleeve-type parts processing, the method comprising the following steps:

[0041] S1: The part to be processed 8 is mounted on the outer sides of the plurality of elastic sheets 502;

[0042] S2: clamp the wrench 7 into the blind hole 303 on the outer wall of the nut 3, and rotate the wrench 7 to drive the nut 3 to move toward the tail end of the core shaft 6;

[0043] S3: The inner ring groove 301 of the nut 3 pushes the cylindrical limiting pin 2 to move;

[0044] S4: The cylindrical limit pin 2 drives the mandrel 6 to move;

[0045] S5: The conical shaft head 602 of the core shaft 6 spreads out the multiple elastic sheets 502 so that the multiple elastic sheets 502 fit with the inner diameter of the part 8 to be processed, thereby fixing the part 8 to be processed.

[0046] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and range of equivalents of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0047] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An adjustable inner expansion mandrel fixture for sleeve-type parts processing, characterized in that: The invention comprises a clamping spring body (1), a cylindrical limiting pin (2), a nut (3), a clamping spring (5) and a core shaft (6); the clamping spring body (1) and the clamping spring (5) are sleeved on the outer side of the core shaft (6); the rear end of the clamping spring (5) is inserted into the interior of the clamping spring body (1) and the clamping spring (5) is fixedly connected to the clamping spring body (1); the outer wall of the spring body (1) is screwed to the nut (3); the cylindrical limiting pin (2) is inserted into the nut (3), the clamping spring body (1) and the core shaft (6).

2. The adjustable inner expansion mandrel fixture for sleeve-type parts processing according to claim 1 is characterized in that: The core shaft (6) comprises a coaxially arranged shaft rod (601) and a conical shaft head (602), and the shaft rod (601) is radially penetrated by a socket 1 (603).

3. The adjustable inner expansion mandrel fixture for sleeve-type parts processing according to claim 2 is characterized in that: The clamp spring (5) comprises a circular ring body (501) and a plurality of elastic sheets (502), wherein the plurality of elastic sheets (502) are arranged along the circumference of the circular ring body (501) and an opening (503) is provided between every two adjacent elastic sheets (502), the inner wall of each elastic sheet (502) is a wedge-shaped surface (504), the circular ring body (501) is sleeved on the outer side of the shaft rod (601), the plurality of elastic sheets (502) are sleeved on the outer side of the conical shaft head (602) and the wedge-shaped surfaces (504) of the plurality of elastic sheets (502) are arranged in cooperation with the conical surface of the conical shaft head (602); the outer wall of the circular ring body (501) is provided with a positioning hole (505) penetrating the inner wall thereof along its radial direction.

4. The adjustable inner expansion mandrel fixture for sleeve-type parts processing according to claim 3 is characterized in that: The middle part of the clamp spring body (1) is provided with a mounting hole (101) running axially therethrough, the middle part of the clamp spring body (1) is provided with a second insertion hole (102) running radially therethrough, and the outer wall of the clamp spring body (1) is provided with a second positioning hole (103) running through its inner wall along its radial direction; a core shaft (6) and a clamp spring (5) are inserted into the mounting hole (101), and the clamp spring body (1) and the clamp spring (5) are fixedly connected in a limited manner by inserting a positioning pin (4) into the second positioning hole (103) and the first positioning hole (505).

5. The adjustable inner expansion mandrel fixture for sleeve-type parts processing according to claim 4 is characterized in that: The inner wall ring of the nut (3) is provided with an inner ring groove (301) in the circumferential direction, and the inner ring groove (301) is provided with two insertion holes (302) penetrating the outer wall of the nut (3) along the radial direction of the nut (3), the two insertion holes (302) are relatively concentrically arranged, the insertion hole (302), the second insertion hole (102) and the first insertion hole (603) are correspondingly arranged, and the cylindrical limiting pin (2) is inserted into the third insertion hole (302), the second insertion hole (102) and the first insertion hole (603).

6. The adjustable inner expansion mandrel fixture for sleeve-type parts processing according to claim 5 is characterized in that: The outer wall of the nut (3) is also provided with a blind hole (303), and the blind hole (303) is used in conjunction with a wrench (7).

7. The adjustable inner expansion mandrel fixture for sleeve-type parts processing according to claim 1 is characterized in that: The threads for screwing together the inner wall of the nut (3) and the outer wall of the spring body (1) are both 29° trapezoidal threads.

8. A method for using the adjustable inner expansion mandrel fixture for sleeve-type parts processing according to claim 1, characterized in that: The method comprises the following steps: S1: The part to be processed (8) is mounted on the outer sides of a plurality of elastic sheets (502); S2: clamp the spanner (7) into the blind hole (303) on the outer wall of the nut (3), and rotate the spanner (7) to drive the nut (3) to move toward the rear end of the core shaft (6); S3: The inner ring groove (301) of the nut (3) pushes the cylindrical stop pin (2) to move; S4: The cylindrical limiting pin (2) drives the mandrel (6) to move; S5: The conical shaft head (602) of the core shaft (6) spreads out the multiple elastic sheets (502), so that the multiple elastic sheets (502) fit with the inner diameter of the part to be processed (8), thereby achieving the fixation of the part to be processed (8).

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