Expansion device for machining thin-wall cylindrical part
By combining the design expansion shaft and the wedge-shaped block, uniform expansion and deformation of thin-walled cylindrical parts is achieved, solving the problem of insufficient support of existing expansion and tightening devices, and improving processing efficiency and accuracy.
Patent Information
- Application Number
- CN202420954708.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-30
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-04-30
AI Technical Summary
The existing expansion and tightening devices lack effective support when processing thin-walled cylindrical parts, resulting in a long expansion and tightening time and can only handle parts of a certain length.
A tightening device including an expansion shaft, a wedge block, an expansion shaft seat and a top pressure member is designed. Through the cooperation of the central diameter hole of the expansion shaft and the wedge block, the thin-walled cylindrical parts are uniformly expanded by the wedge expansion principle. , achieve better support and deformation.
The device can effectively support thin-walled cylindrical parts, ensure uniform expansion and deformation, facilitate machining and detection, and solve the problems of long expansion and insufficient support.
Smart Images
Figure CN222268722U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of turning fixtures, in particular to an expansion device for processing thin-walled cylindrical parts. Background Art
[0002] Thin-walled parts are currently generally processed by CNC turning. For this purpose, tests must be conducted on the workpiece clamping, tool geometry parameters, program compilation, etc., thereby effectively overcoming the deformation that occurs during the processing of thin-walled parts and ensuring processing accuracy.
[0003] A dish-shaped expansion mechanism for processing thin-walled cylindrical parts with publication number CN201529781U comprises a mandrel, an expansion plate, a disc and a nut, two pin holes are arranged at one end of the mandrel, two discs are installed at both ends of the shaft section with the largest diameter in the middle of the mandrel, expansion plates are respectively installed on the mandrel outside the two discs, the expansion plate is a dish-shaped metal plate with a circular boss in the middle, a through hole is provided in the middle of the circular boss, a plurality of notches are evenly opened on the expansion plate, the edge portion of the expansion plate is thicker than the wall of the expansion plate, the side surface of the edge of the expansion plate is the supporting surface of the expansion part, nuts are installed on the mandrel outside the two expansion plates, a shaft hoop with a pin hole is arranged at one end of the mandrel with a pin hole, the pin hole of the shaft hoop is aligned with the pin hole of the mandrel, and the shaft hoop is fixed to the mandrel by a cylindrical pin.
[0004] However, due to the structure and material of the thin-walled cylindrical parts themselves, the parts have poor rigidity, and a good clamping method can ensure that qualified products are processed; the disclosed expansion mechanism uses an expansion disk to expand the parts, but in actual operation, the expansion time is relatively long, and since it is used in conjunction with a core shaft, it can only clamp parts of a certain length. Utility Model Content
[0005] The main purpose of the utility model is to provide a tensioning device for processing thin-walled cylindrical parts, aiming to solve the technical problem that the existing tensioning device lacks support during tensioning when processing and testing the parts.
[0006] In order to achieve the above-mentioned purpose, the utility model proposes a tightening device for processing thin-walled cylindrical parts, comprising:
[0007] The expansion shaft is inserted into the inner hole of the thin-walled cylindrical part, and a central diameter-reducing hole is vertically penetrated in the center of the expansion shaft, and the central diameter-reducing hole is composed of a first bell mouth, a middle hole and a second bell mouth which are connected in sequence from bottom to top;
[0008] An expansion shaft seat is vertically fixedly connected to the ground, and the expansion shaft seat comprises a coaxially connected diameter section and a conical section, wherein the diameter section is located at the top of the conical section;
[0009] The diameter section of the expansion shaft seat is suitable for being inserted into the central diameter-reducing hole at the bottom of the expansion shaft, so that the diameter section is adapted to be connected with the middle hole, and the tapered section is adapted to be connected with the first bell mouth;
[0010] A wedge-shaped block, adapted to be inserted in an inverted manner into the second bell mouth of the expansion shaft;
[0011] The pressing piece applies pressure to the top surface of the wedge block so that the expansion shaft can expand and tighten the thin-walled cylindrical part.
[0012] Optionally, a plurality of evenly distributed and vertically non-penetrating open long grooves are provided on the outer wall of the expansion shaft, and the open long grooves include an upper open groove extending vertically downward from the second bell mouth and a lower open groove extending vertically upward from the first bell mouth, and the upper open grooves and the lower open grooves are equidistantly spaced.
[0013] Optionally, the pressing piece is a hexagon socket screw, and a first center screw hole vertically passing through the center of the wedge block is opened, and a second center screw hole opposite to the first center screw hole is opened in the center of the diameter section and the conical section, and the hexagon socket screw is suitable for being threadedly connected in the first center screw hole and the second center screw hole.
[0014] Optionally, the wedge block includes a coaxially connected flange and a conical block, an inner stop coaxially connected to the second bell mouth is provided on the upper end surface of the expansion shaft, and the conical block is suitable for being adapted to be connected to the second bell mouth, the flange is suitable for being connected to the inner stop, and the height of the flange is equal to the height of the inner stop.
[0015] Optionally, the inclination angle between the wedge block and the second bell mouth is 25-35 degrees, and the inclination angle of the first bell mouth is 65-75 degrees.
[0016] Optionally, a countersunk hole is provided at the center of the flange, and the countersunk hole is suitable for accommodating a nut of the hexagon socket screw.
[0017] Optionally, the expansion shaft seat further comprises a base section coaxially connected to the bottom of the conical section, and an upper surface of the base section is suitable for supporting the lower end surface of the expansion shaft.
[0018] Optionally, the base segment includes a first flange segment, a first shaft segment and a second shaft segment which are coaxially connected in sequence, and a first circular hole communicating with the second center screw hole is opened in the center of the first shaft segment and the second shaft segment.
[0019] Optionally, the diameters of the first flange segment, the first shaft segment, and the second shaft segment decrease sequentially.
[0020] Optionally, a plurality of evenly distributed mounting screw holes are formed on the lower end surface of the second shaft segment.
[0021] Compared with the prior art, the beneficial effects of the utility model are:
[0022] In the technical scheme of the utility model, the expansion device for processing thin-walled cylindrical parts consists of an expansion shaft, a wedge block, an expansion shaft seat and a top pressure piece. The expansion shaft seat is vertically installed on the ground. The top of the expansion shaft seat is provided with a coaxially connected diameter section and a tapered section, and the expansion shaft is vertically placed on the diameter section and the tapered section. Since the bottom center of the expansion shaft is provided with an intermediate hole and a first bell mouth respectively adapted to the diameter section and the tapered section, the lower end of the expansion shaft is just installed on the expansion shaft seat, and a thin-walled cylindrical part is sleeved on the outer circumference of the expansion shaft, and the inner diameter of the thin-walled cylindrical part is equivalent to the outer diameter of the expansion shaft; a second bell mouth is also opened in the center of the upper half of the expansion shaft, and a wedge block is filled in the second bell mouth. By applying a force to the top of the wedge block, the wedge block moves downward and squeezes the second bell mouth of the expansion shaft. By utilizing the wedge expansion principle, the thin-walled cylindrical part can be evenly expanded, the thin-walled part is propped up, and the thin-walled part also expands and deforms accordingly, so that the thin-walled cylindrical part can be used for machining or detection. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.
[0024] Figure 1 A schematic diagram of the front view of the expansion device for processing thin-walled cylindrical parts provided by an embodiment of the utility model;
[0025] Figure 2 This is a schematic diagram of the internal structure of the expansion shaft in the embodiment of the utility model;
[0026] Figure 3 It is a schematic diagram of the three-dimensional structure of the expansion shaft in the embodiment of the utility model.
[0027] Description of Figure Numbers:
[0028] 1- expansion shaft; 11- center diameter reducing hole; 111- first bell mouth; 112- middle hole; 113- second bell mouth; 114- inner stop; 12- open long slot; 121- upper open slot; 122- lower open slot;
[0029] 2-wedge block; 21-flange; 211-counter hole; 22-conical block; 221-first center screw hole;
[0030] 3- Hexagon socket screw;
[0031] 4- expansion shaft seat; 41- diameter section; 42- conical section; 43- base section; 431- first flange section; 432- first shaft section; 433- second shaft section; 44- second center screw hole; 45- first round hole; 46- mounting screw hole;
[0032] 5-Thin-walled cylindrical parts. DETAILED DESCRIPTION
[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0034] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0035] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.
[0036] See also Figure 1-3 As shown, the utility model provides an expansion device for processing thin-walled cylindrical parts, the expansion device comprises an expansion shaft 1, a wedge block 2, an expansion shaft seat 4 and a top pressure piece, wherein:
[0037] The expansion shaft 1 is inserted into the inner hole of the thin-walled cylindrical part 5, and a central reducing hole 11 is vertically penetrated in the center of the expansion shaft 1, and the central reducing hole 11 is composed of a first bell mouth 111, an intermediate hole 112 and a second bell mouth 113 connected in sequence; the expansion shaft seat 4 is vertically fixedly connected to the ground, and the expansion shaft seat 4 includes a coaxially connected diameter section 41 and a tapered section 42, and the diameter section 41 is located at the top of the tapered section 42; the diameter section 41 of the expansion shaft seat 4 is suitable for being inserted into the central reducing hole 11 at the bottom of the expansion shaft 1, so that the diameter section 41 and the intermediate hole 112 are adapted to be connected, and the tapered section 42 and the first bell mouth 111 are adapted to be connected; the wedge block 2 is suitable for being inverted and inserted in the second bell mouth 113 of the expansion shaft 1; the top pressure piece can apply pressure to the top surface of the wedge block 2, so that the expansion shaft 1 can expand and tighten the thin-walled cylindrical part 5.
[0038] In the technical solution of the utility model, the expansion shaft seat 4 is vertically installed on the ground, and the top of the expansion shaft seat 4 is provided with a coaxially connected diameter section 41 and a tapered section 42, and the expansion shaft 1 is vertically placed on the diameter section 41 and the tapered section 42. Since the bottom center of the expansion shaft 1 is provided with an intermediate hole 112 and a first bell mouth 111 respectively adapted to the diameter section 41 and the tapered section 42, the lower end of the expansion shaft 1 is just mounted on the expansion shaft seat 4, and a thin-walled cylindrical part 5 is sleeved on the outer circumference of the expansion shaft 1. The inner diameter of the thin-walled cylindrical part 5 is equivalent to the outer diameter of the expansion shaft 1; a second bell mouth 113 is also opened in the center of the upper half of the expansion shaft 1, and a wedge block 2 is filled in the second bell mouth 113. By applying a force to the top of the wedge block 2, the wedge block 2 moves downward and squeezes the second bell mouth 113 of the expansion shaft 1. By utilizing the wedge expansion principle, the thin-walled cylindrical part 5 can be expanded evenly, propping up the thin-walled part, and the thin-walled part also expands and deforms accordingly, so that the thin-walled cylindrical part 5 can be used for machining or testing.
[0039] Furthermore, a plurality of evenly distributed and vertically non-penetrating open long grooves 12 are provided on the outer wall of the expansion shaft 1, and the open long grooves 12 include an upper open groove 121 extending vertically downward from the second bell mouth 113 and a lower open groove 122 extending vertically upward from the first bell mouth 111, and the upper open grooves 121 and the lower open grooves 122 are equidistantly spaced.
[0040] Therefore, please refer to Figure 3 As shown, in a specific embodiment of the utility model, the open long groove 12 is composed of an upper open groove 121 and a lower open groove 122, wherein the upper open groove 121 and the lower open groove 122 are evenly spaced from each other, and the upper open groove 121 and the lower open groove 122 are not completely penetrated, so that the expansion deformation of the thin-walled tubular part 5 can be more uniform.
[0041] Furthermore, the pressing part is a hexagon socket screw 3, and a first center screw hole 221 vertically passing through the center of the wedge block 2 is opened, and a second center screw hole 44 opposite to the first center screw hole 221 is opened in the center of the diameter section 41 and the conical section 42, and the hexagon socket screw is suitable for being threadedly connected in the first center screw hole 221 and the second center screw hole 44.
[0042] See also Figure 1 , 2 As shown, in the specific embodiment of the utility model, the top pressure piece is preferably set to a hexagon socket screw 3, which is screwed into the first center screw hole 221 and the second center screw hole 44, so as to not only realize the connection between the wedge block 2 and the expansion shaft seat 4, but also when the hexagon socket screw 3 is screwed downward, the expansion shaft 1 will be subjected to internal radial compression, thereby causing expansion deformation, so that the inner wall of the thin-walled cylindrical part 5 is tightly attached to the expansion shaft 1, and then expansion deformation occurs.
[0043] Specifically, the wedge block 2 includes a coaxially connected flange 21 and a conical block 22. An inner stop 114 coaxially connected to the second bell mouth 113 is provided on the upper end surface of the expansion shaft 1, and the conical block 22 is suitable for being adaptively connected to the second bell mouth 113. The flange 21 is suitable for being connected to the inner stop 114, and the height of the flange 21 is equal to the height of the inner stop 114.
[0044] See also Figure 1 As shown, in a specific embodiment of the utility model, the wedge block 2 is composed of a flange 21 and a conical block 22, and the conical block 22 is adapted to the shape of the second bell mouth 113. When the conical block 22 of the wedge block 2 is inserted downward into the second bell mouth 113 of the expansion shaft 1, the flange 21 abuts against the inner stop 114, and the height of the flange 21 is the same as the depth of the inner stop 114.
[0045] Therefore, the pressure of the wedge block 2 on the expansion shaft 1 will have a radial component force, which will cause the expansion shaft 1 to expand and deform, thereby pressing against the thin-walled cylindrical part 5 and causing the thin-walled cylindrical part 5 to deform and expand.
[0046] Furthermore, the inclination angle between the wedge block 2 and the second bell mouth 113 is 25-35 degrees, and the inclination angle of the first bell mouth 111 is 65-75 degrees.
[0047] For more details, see Figure 2 As shown, in the specific embodiment of the present utility model, as the best preferred mode, the inclination angle between the wedge block 2 and the second bell mouth 113 is selected to be 30 degrees, with a tolerance of 0.01 degrees; in addition, the inclination angle of the first bell mouth 111 is preferably 70 degrees.
[0048] Furthermore, a countersunk hole 211 is provided at the center of the flange 21 , and the countersunk hole 211 is suitable for accommodating the nut of the hexagon socket screw 3 .
[0049] See also Figure 1 As shown, in the specific embodiment of the utility model, considering that the pressing member is selected as a hexagon socket screw 3, since it is necessary to apply downward pressing pressure through the hexagon socket screw 3, the hexagon socket screw 3 has a nut, and for this purpose a countersunk hole 211 is opened on the flange 21, and the nut of the hexagon socket screw 3 is screwed into the bottom of the countersunk hole 211, and the pressing is in place.
[0050] For details, please refer to Figure 1 As shown, in a specific embodiment of the present utility model, the expansion shaft seat 4 also includes a base section 43 coaxially connected to the bottom of the conical section 42, and the upper surface of the base section 43 is suitable for supporting the lower end surface of the expansion shaft 1. Since the base section 43 is a cylindrical structure, and the diameter of the upper end surface of the base section 43 is greater than the outer diameter of the expansion shaft 1, the lower end surface of the expansion shaft 1 can be completely supported on the upper surface of the base section 43.
[0051] Furthermore, the base section 43 includes a first flange section 431 , a first shaft section 432 and a second shaft section 433 which are coaxially connected in sequence, and a first circular hole 45 communicating with the second central screw hole 44 is formed in the centers of the first shaft section 432 and the second shaft section 433 .
[0052] See also Figure 1 As shown, in a specific embodiment of the utility model, the base section 43 is composed of a first flange section 431, a first shaft section 432 and a second shaft section 433, wherein the centers of the first shaft section 432 and the second shaft section 433 have a hollow structure, which not only reduces the weight of the material but also facilitates transportation.
[0053] Furthermore, the diameters of the first flange segment 431 , the first shaft segment 432 , and the second shaft segment 433 decrease sequentially.
[0054] See also Figure 1 As shown, further, a plurality of evenly distributed mounting screw holes 46 are provided on the lower end surface of the second shaft section 433. In this way, the fixed connection through the anchor bolts not only facilitates the fixing of the expansion shaft seat 4, but also fixes it firmly.
[0055] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.
Claims
1. A tightening device for processing thin-walled cylindrical parts, characterized in that: include: An expansion shaft (1) is inserted into the inner hole of a thin-walled cylindrical part (5), and a central diameter-reducing hole (11) is vertically penetrated at the center of the expansion shaft (1), and the central diameter-reducing hole (11) is composed of a first bell mouth (111), a middle hole (112) and a second bell mouth (113) which are connected in sequence from bottom to top; An expansion shaft seat (4) is vertically fixedly connected to the ground, and the expansion shaft seat (4) comprises a coaxially connected diameter section (41) and a conical section (42), wherein the diameter section (41) is located at the top of the conical section (42); The diameter section (41) of the expansion shaft seat (4) is suitable for being inserted into the central diameter-reducing hole (11) at the bottom of the expansion shaft (1), so that the diameter section (41) is adapted to be connected with the middle hole (112), and the tapered section (42) is adapted to be connected with the first bell mouth (111); A wedge-shaped block (2) adapted to be inserted in an inverted manner into the second bell mouth (113) of the expansion shaft (1); A pressing piece applies pressure to the top surface of the wedge block (2) so that the expansion shaft (1) can expand and tighten the thin-walled cylindrical part (5).
2. The expansion device for processing thin-walled cylindrical parts according to claim 1, characterized in that: The outer wall of the expansion shaft (1) is provided with a plurality of evenly distributed and vertically non-penetrating open long grooves (12), the open long grooves (12) comprising an upper open groove (121) extending vertically downward from the second bell mouth (113) and a lower open groove (122) extending vertically upward from the first bell mouth (111), and the upper open grooves (121) and the lower open grooves (122) are distributed at equal intervals.
3. The expansion device for processing thin-walled cylindrical parts according to claim 1, characterized in that: The pressing member is a hexagon socket screw (3), and a first central screw hole (221) vertically passing through the center of the wedge block (2), and a second central screw hole (44) arranged opposite to the first central screw hole (221) is formed in the center of the diameter section (41) and the conical section (42), and the hexagon socket screw (3) is suitable for being threadedly connected in the first central screw hole (221) and the second central screw hole (44).
4. The expansion device for processing thin-walled cylindrical parts according to claim 3, characterized in that: The wedge block (2) comprises a coaxially connected flange (21) and a conical block (22); an inner stop (114) coaxially connected to the second bell mouth (113) is provided on the upper end surface of the expansion shaft (1); the conical block (22) is suitable for being matched and connected to the second bell mouth (113); the flange (21) is suitable for being connected to the inner stop (114); and the height of the flange (21) is equal to the height of the inner stop (114).
5. The expansion device for processing thin-walled tubular parts according to any one of claims 1 to 4, characterized in that: The inclination angle between the wedge block (2) and the second bell mouth (113) is 25-35 degrees, and the inclination angle of the first bell mouth (111) is 65-75 degrees.
6. The expansion device for processing thin-walled tubular parts according to claim 4, characterized in that: A countersunk hole (211) is provided at the center of the flange (21), and the countersunk hole (211) is suitable for accommodating the nut of the hexagon socket screw (3).
7. The expansion device for processing thin-walled tubular parts according to claim 3, characterized in that: The expansion shaft seat (4) also includes a base section (43) coaxially connected to the bottom of the conical section (42), and the upper surface of the base section (43) is suitable for supporting the lower end surface of the expansion shaft (1).
8. The expansion device for processing thin-walled tubular parts according to claim 7, characterized in that: The base section (43) comprises a first flange section (431), a first shaft section (432) and a second shaft section (433) which are coaxially connected in sequence, and a first circular hole (45) which is connected to the second center screw hole (44) is opened in the center of the first shaft section (432) and the second shaft section (433).
9. The expansion device for processing thin-walled tubular parts according to claim 8, characterized in that: The diameters of the first flange section (431), the first shaft section (432), and the second shaft section (433) decrease sequentially.
10. The expansion device for processing thin-walled tubular parts according to claim 8, characterized in that: The lower end surface of the second shaft section (433) is provided with a plurality of evenly distributed mounting screw holes (46).