Novel three-petal fan-shaped clamp backer

Abstract

The utility model discloses a novel three-petal fan-shaped clamp backer which comprises a backer disc, a backer unit and a clamping unit. The backer unit and the clamping unit are coaxially arranged on the backer disc. A mounting hole is formed in the center of the backing disc in a penetrating mode, the backing unit comprises a plurality of backing tables arranged around the mounting hole, the end face of each backing table abuts against the workpiece containing face, the inner side wall of each backing table is matched with the inner wall of the mounting hole, and the clamping end of the clamping unit penetrates through the mounting hole and extends out of the backing tables. The clamping ends of the clamping units can be expanded outwards or folded inwards so that the clamping ends of the clamping units can abut against the inner cavity wall of the workpiece in a matched mode, and chip removal cavities are formed between the clamping ends of the clamping units and the two adjacent backing tables. According to the novel three-petal fan-shaped clamp backer, generated scrap iron falls into the scrap discharging cavity and is smoothly discharged along with centrifugal movement during rotation of the backer disc, the requirement for the coaxiality of the backer unit and a workpiece is met, and the machining quality of the workpiece is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of machine tool fixtures, in particular to a novel three-petal fan-shaped fixture backer. Background Art

[0002] At present, the limiting and positioning device commonly used in mechanical processing is called a backing. During operation, the workpiece to be processed is pushed against and pressed against the backing, and then the workpiece is processed by the tool. For example, when processing a rotating workpiece such as a perforating shell, since the inner cavity and the outer shape of the perforating shell are both circular, the circular abutting surface of the perforating shell needs to be fitted with the positioning surface of the backing when the fixture clamps the perforating shell. After that, the fixture drives the perforating shell to rotate, and the surface of the perforating shell is cut by the tool. In this process, filamentary iron filings are easily generated, and the iron filings accumulate and remain on the positioning surface of the backing, causing the abutting surface of the workpiece to contact the iron filings, which can easily cause the iron filings to scratch the surface of the workpiece or the surface of the backing, and the uneven surface between the workpiece and the backing, resulting in the processing size of the workpiece exceeding the tolerance, making it impossible to guarantee the processing quality of the workpiece. Utility Model Content

[0003] The utility model aims to solve the deficiencies of the above-mentioned technology and is designed to provide a new three-petal fan-shaped fixture backing. The generated iron chips fall into the chip discharge chamber and are discharged smoothly with the centrifugal movement of the backing plate during rotation, thereby ensuring the coaxiality requirements of the backing unit and the workpiece and improving the processing quality of the workpiece.

[0004] In order to solve the above technical problems, the technical solution of the utility model is: a new type of three-petal fan-shaped clamp backrest, including a backrest plate, and a backrest unit and a clamping unit coaxially arranged on the backrest plate; the center of the backrest plate is penetrated by a mounting hole, and the backrest unit includes a plurality of backrest platforms arranged around the mounting hole, the end face of each of the backrest platforms is in conflict with the placement surface of the workpiece, and the inner side wall of each of the backrest platforms is matched with the inner wall of the mounting hole, the clamping end of the clamping unit passes through the mounting hole and extends out of the outer side of the backrest platform, and the clamping end of the clamping unit can expand outward or retract inward so that the clamping end of the clamping unit is adaptively pressed against the inner cavity wall of the workpiece, and a chip removal cavity is formed between the clamping end of the clamping unit and two adjacent backrest platforms.

[0005] Preferably, there are three backing platforms, which are evenly distributed in a circular array, and each backing platform is fixedly connected to the backing plate.

[0006] Preferably, the clamping unit includes a plurality of clamping parts evenly distributed in a circular array, and a driving rod, wherein the plurality of clamping parts together form a clamping end of a clamping unit in the shape of a ring, a first deformation space is provided between two adjacent clamping parts, a second deformation space is provided between an outer wall of the clamping part and an inner wall of the backrest, a driving surface inclined inwardly is formed on the inner wall of the clamping part, the driving rod is telescopically movable in the clamping end of the clamping unit, and the driving part of the driving rod is a conical structure that abuts against the driving surface.

[0007] Preferably, the clamping unit also includes a mounting plate, which is connected to the backing plate, and the connecting structure of each clamping part is fixedly connected to the mounting plate. The mounting plate is penetrated by a guide hole coaxially arranged with the mounting hole, and the driving rod is slidably connected in the guide hole.

[0008] Preferably, a limiting surface is formed on one side of the driving portion close to the guide hole, and the limiting surface is in abutment with a side wall of the mounting plate.

[0009] Preferably, a guide sleeve is formed on the side wall of the mounting plate away from the clamping portion, and the guide hole penetrates to the inner wall of the guide sleeve.

[0010] Preferably, the portion of the driving rod extending out of the guide sleeve is formed with a connecting end.

[0011] Preferably, the mounting plate is installed with a plurality of first fasteners, and the first fasteners extend out of the outer side of the mounting plate.

[0012] Preferably, the backing plate is installed with a plurality of second fasteners, the second fasteners are arranged in a staggered manner with the first fasteners, and the backing plate and the mounting plate are detachably connected via the second fasteners.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The utility model discloses a novel three-petal fan-shaped clamp backing, which abuts the placement surface of the workpiece against the end surfaces of each backing platform of the backing unit, the workpiece is sleeved on the clamping end of the clamping unit, the clamping end of the clamping unit expands outward and abuts against the inner cavity wall of the workpiece to position the workpiece on the backing plate, and the workpiece is driven to rotate by rotating the clamp backing for cutting processing. In this process, the generated iron chips fall into the chip discharge chamber and are smoothly discharged with the centrifugal movement of the backing plate during rotation, so as to avoid the residual iron chips and damage to the abutting surface of the workpiece or the end surface of the backing platform, and the processing size of the workpiece is out of tolerance, thereby ensuring the coaxiality requirements of the backing unit and the workpiece and improving the processing quality of the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1is a schematic diagram of the structure of the clamping backer and the workpiece in the embodiment;

[0016] Figure 2 is a cross-sectional view of the clamping backer and the workpiece in the embodiment;

[0017] Figure 3 is an exploded view of the clamping backer in the embodiment.

[0018] In the figure: 1, workpiece; 101, placement surface; 2, backrest plate; 201, mounting hole; 202, second fastener; 3, backrest platform; 301, end face; 4, chip removal chamber; 5, mounting plate; 501, guide hole; 502, guide sleeve; 503, first fastener; 6, clamping part; 601, first deformation space; 602, second deformation space; 603, driving surface; 604, connecting structure; 7, driving rod; 701, driving part; 702, limiting surface; 703, connecting end; 8, iron chips. DETAILED DESCRIPTION

[0019] The present invention will be further described below by way of embodiments in conjunction with the accompanying drawings.

[0020] refer to Figure 1 , Figure 2 , Figure 3 A novel three-petal fan-shaped clamp backing includes a backing plate 2, a backing unit and a clamping unit. The center of the backing plate 2 is penetrated with a mounting hole 201. The backing unit includes three backing platforms 3. The three backing platforms 3 are arranged around the mounting hole 201 and are evenly distributed in a circular array. Each backing platform 3 is fixedly connected to the backing plate 2. Preferably, the backing platform 3 is a fan-shaped structure, and the inner side walls of the backing platform 3 are matched with the inner wall of the mounting hole 201;

[0021] The clamping unit includes a mounting plate 5, three clamping parts 6 evenly distributed in a circular array, and a driving rod 7. The mounting plate 5 is installed with three first fasteners 503, and the first fasteners 503 extend out of the mounting plate 5 so as to fix the mounting plate 5 on the machine tool. The backing plate 2 is installed with three second fasteners 202, and the second fasteners 202 are arranged in a staggered manner with the first fasteners 503. The backing plate 2 and the mounting plate 5 are detachably connected through the second fasteners 202. Preferably, the first fasteners 503 and the second fasteners 202 are both bolt structures.

[0022] The connecting structure 604 of each clamping part 6 is fixedly connected to the mounting plate 5, and the gap between two adjacent clamping parts 6 is matched to have a first deformation space 601, and the gap between the outer wall of the clamping part 6 and the inner wall of the backrest 3 is matched to have a second deformation space 602. The three clamping parts 6 are surrounded to form a clamping end of a ring-shaped clamping unit, which passes through the mounting hole 201 and extends out of the outside of the backrest 3. The driving rod 7 is inserted into the clamping end, and the mounting plate 5 is penetrated by a guide hole 501 coaxially arranged with the mounting hole 201. The rod part of the driving rod 7 is slidably connected in the guide hole 501, and a guide sleeve 502 is formed on the side wall of the mounting plate 5 away from the clamping part 6. The guide hole 501 passes through the inner wall of the guide sleeve 502, and the guide sleeve 502 is used to guide the telescopic movement of the driving rod 7 relative to the clamping unit.

[0023] The inner wall of the clamping portion 6 is formed with a driving surface 603 inclined inwardly, and the driving portion 701 of the driving rod 7 is in a conical structure and contacts with the driving surface 603. Under the guidance of the driving surface 603, when the driving rod 7 slides toward the side close to the mounting plate 5, the driving portion 701 moves along the axial direction of the driving rod 7 close to the guide hole 501, and the driving portion 701 drives each clamping portion 6 to expand outward. Preferably, a limited position surface 702 is formed on the side of the driving portion 701 close to the guide hole 501, and the limited position surface 702 is in contact with the guide hole 501. The side wall of the mounting plate 5 is abutted against and cooperated to limit the movement of the driving portion 701; when the driving rod 7 slides to the side away from the mounting plate 5, the driving portion 701 moves away from the guide hole 501 along the axial direction of the driving rod 7, and the driving portion 701 drives each clamping portion 6 to retract inward; the portion of the driving rod 7 extending out of the guide sleeve 502 is formed with a connecting end 703, and preferably, the connecting end 703 is an end portion with a threaded section so as to connect the driving rod 7 to an external driving device, thereby controlling the clamping action of the clamping unit.

[0024] When the clamp is used to clamp a workpiece 1 such as a perforating shell, the placement surface 101 of the workpiece 1 is abutted against the end surface 301 of each support platform 3 of the support unit, and the workpiece 1 is sleeved on the clamping end of the clamping unit. The clamping end of the clamping unit is driven to expand outward by operating the driving rod 7 to fit tightly against the inner cavity wall of the workpiece 1, so as to position the workpiece 1 on the support plate 2. After that, the clamp is rotated to drive the workpiece 1 to rotate for cutting processing. A chip removal cavity 4 is formed between the clamping end of the clamping unit and two adjacent support platforms 3. In this process, the iron chips 8 generated fall into the chip removal cavity 4 and are smoothly discharged with the centrifugal movement of the rotation of the support plate 2, so as to avoid the iron chips 8 remaining and damaging the support surface of the workpiece 1 or the end surface 301 of the support platform 3, and the processing size of the workpiece 1 is out of tolerance, so as to ensure the coaxiality requirements of the support unit and the workpiece 1 and improve the processing quality of the workpiece 1.

[0025] Of course, the above are only typical examples of the present invention. In addition, the present invention may have many other specific implementations. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. A new type of three-petal fan-shaped clamp backing, characterized by: The invention comprises a backing plate (2), and a backing unit and a clamping unit coaxially arranged on the backing plate (2); a mounting hole (201) is passed through the center of the backing plate (2); the backing unit comprises a plurality of backing platforms (3) arranged around the mounting hole (201); the end face (301) of each backing platform (3) is in contact with the placement surface (101) of the workpiece (1), and the inner side wall of each backing platform (3) is matched with the inner wall of the mounting hole (201); the clamping end of the clamping unit passes through the mounting hole (201) and extends out of the outer side of the backing platform (3); the clamping end of the clamping unit can expand outward or retract inward so that the clamping end of the clamping unit is adaptively pressed against the inner cavity wall of the workpiece (1); and a chip removal cavity (4) is formed between the clamping end of the clamping unit and two adjacent backing platforms (3).

2. According to claim 1, the novel three-petal fan-shaped clamp backer is characterized in that: The number of the backing platforms (3) is three, and the three backing platforms (3) are evenly distributed in a circular array, and each of the backing platforms (3) is fixedly connected to the backing plate (2).

3. A novel three-petal fan-shaped clamp backer according to claim 1 or 2, characterized in that: The clamping unit comprises a plurality of clamping parts (6) uniformly distributed in a circular array, and a driving rod (7); the plurality of clamping parts (6) are combined to form a clamping end of a clamping unit in the shape of a ring; a first deformation space (601) is provided between two adjacent clamping parts (6); a second deformation space (602) is provided between the outer wall of the clamping part (6) and the inner wall of the backrest (3); a driving surface (603) inclined inwardly is formed on the inner wall of the clamping part (6); the driving rod (7) is telescopically movable in the clamping end of the clamping unit; the driving part (701) of the driving rod (7) is in a conical structure and contacts with the driving surface (603).

4. The novel three-petal fan-shaped clamp backer according to claim 3 is characterized in that: The clamping unit also includes a mounting plate (5), the mounting plate (5) being connected to the backing plate (2), the connecting structure (604) of each clamping portion (6) being fixedly connected to the mounting plate (5), the mounting plate (5) being penetrated by a guide hole (501) coaxially arranged with the mounting hole (201), and the driving rod (7) being slidably connected in the guide hole (501).

5. The novel three-petal fan-shaped clamp backer according to claim 4 is characterized in that: A limiting surface (702) is formed on one side of the driving portion (701) close to the guide hole (501), and the limiting surface (702) is in contact with the side wall of the installation plate (5).

6. The novel three-petal fan-shaped clamp backer according to claim 4 is characterized in that: A guide sleeve (502) is formed on the side wall of the mounting plate (5) away from the clamping portion (6), and the guide hole (501) penetrates to the inner wall of the guide sleeve (502).

7. The novel three-petal fan-shaped clamp backer according to claim 6 is characterized in that: The portion of the driving rod (7) extending out of the guide sleeve (502) is formed with a connecting end (703).

8. The novel three-petal fan-shaped clamp backer according to claim 4 is characterized in that: The installation plate (5) is installed with a plurality of first fasteners (503), and the first fasteners (503) extend out of the outside of the installation plate (5).

9. The novel three-petal fan-shaped clamp backer according to claim 8 is characterized in that: The backrest plate (2) is installed with a plurality of second fasteners (202), the second fasteners (202) and the first fasteners (503) are arranged in a staggered manner, and the backrest plate (2) and the mounting plate (5) are detachably connected via the second fasteners (202).

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