Simple inner supporting clamp for machining

Abstract

The utility model discloses a simple inner support fixture for machining, which is characterized by comprising a chuck, a forging blank, a positioning fixture and a tail top, the tail end of the positioning fixture is positioned on the chuck, a positioning shaft is used for positioning the inner wall of the forging blank, and the tail top is used for abutting against the bottom of the forging blank. The positioning clamp comprises a positioning shaft and a convex shaft, the convex shaft is located at the top of the positioning shaft, the diameter of the positioning shaft is larger than that of the convex shaft, and the axis of the positioning shaft coincides with that of the convex shaft; an elastic supporting ring is arranged at the connecting position of the protruding shaft and the positioning shaft in a sleeved mode, a rigid spacer bush is further arranged on the outer side of the protruding shaft in a sleeved mode, the spacer bush is cylindrical, and a certain jacking force is exerted on the tail top to force an elastic deformation element to press a forging blank piece, so that a blank cylinder barrel is centered through an inner hole, and rotating force of a lathe is transmitted.

Description

Technical Field

[0001] The utility model relates to the technical field of machining fixtures, in particular to a simple inner support fixture used for machining. Background Art

[0002] During the reproduction process of cylinder parts formed by one-piece forming and reverse extrusion, it was found that the inner hole and the outer circle were not concentric, and the mouth would be skewed. The poor positioning accuracy caused by direct clamping would lead to the scrapping of the workpiece, affecting the subsequent product finishing, low efficiency, time-consuming and labor-intensive, and affecting the product qualification rate. The outer circle and cross-section needed to be trimmed to save time for finishing. At the same time, in order to meet the needs of products of different specifications, this application designed a simple and effective inner core positioning fixture. Utility Model Content

[0003] In order to solve the technical problems existing in the background technology, the utility model proposes a simple internal support fixture for machining.

[0004] The utility model proposes a simple internal support fixture for machining, which includes a chuck, a forging blank, a positioning fixture and a tail top, wherein the tail end of the positioning fixture is positioned on the chuck, the positioning shaft is used to position the inner wall of the forging blank, and the tail top is used to abut the bottom of the forging blank. The positioning fixture includes a positioning shaft and a convex shaft, the convex shaft is located at the top of the positioning shaft, the diameter of the positioning shaft is larger than the diameter of the convex shaft, and the axes of the positioning shaft and the convex shaft coincide with each other;

[0005] An elastic support ring is sleeved on the connection between the convex shaft and the positioning shaft, and a rigid spacer is sleeved on the outer side of the convex shaft. The spacer is cylindrical.

[0006] Preferably, the elastic support rings and rigid spacers are provided in several groups, all of which are sleeved on the outer wall of the top shaft and distributed at intervals.

[0007] Preferably, the top end surface of the rigid spacer farthest from one end of the positioning shaft slightly protrudes from the top end surface of the convex shaft.

[0008] Preferably, the diameter of the elastic support ring is larger than the diameter of the rigid spacer.

[0009] Preferably, the outer wall of the elastic support ring is in close contact with the inner wall of the forging blank.

[0010] Preferably, the outer side wall of the elastic support ring is provided with anti-slip grooves.

[0011] Preferably, a groove is formed on the side wall of the elastic support ring for positioning adjacent rigid spacers.

[0012] In the present invention, a simple internal support fixture for machining is proposed. By applying a certain pressing force on the tail top, the elastic deformation element is forced to press the forged blank, so that the blank cylinder is centered through the inner hole and transmits the rotational force of the lathe. By replacing the rigid spacer between the two elastic elements, the rough processing of deep products can be achieved. The fixture adopts a rubber with a certain resilience + rigid positioning sleeve. A certain pressing force is given by the tail top, forcing the elastic element to deform and squeeze the inner wall of the internal support cylindrical part, thereby positioning the forged blank. Due to the use of simple mechanisms and materials, the positioning requirements of rough processing can be met. The device is simple, economical and effective, and provides reliable protection for product processing.

[0013] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the structure of the utility model when it is tightened;

[0016] Figure 3 This is a schematic structural diagram of the positioning fixture in the present utility model;

[0017] Figure 4 This is a schematic structural diagram of the positioning shaft and the cam shaft in the present utility model;

[0018] Explanation of the numbers in the figure: 1. tail top; 2. forging blank; 3. positioning fixture; 301. positioning shaft; 302. convex shaft; 303. elastic support ring; 304. rigid spacer; 4. chuck. DETAILED DESCRIPTION

[0019] The following describes in detail embodiments of the present invention. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar symbols throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention, and should not be construed as limiting the present invention.

[0020] like Figures 1-4A simple internal support fixture for machining is shown, comprising a chuck 4, a forging blank 2, a positioning fixture 3, and a tail top 1. The tail end of the positioning fixture 3 is positioned on the chuck 4, the positioning shaft 301 is used to position the inner wall of the forging blank 2, and the tail top 1 is used to abut the bottom of the forging blank 2. The positioning fixture 3 includes a positioning shaft 301 and a protruding shaft 302. The protruding shaft 302 is located at the top of the positioning shaft 301. The diameter of the positioning shaft 301 is larger than the diameter of the protruding shaft 302. The axes of the positioning shaft 301 and the protruding shaft 302 coincide.

[0021] An elastic support ring 303 is sleeved at the connection between the protruding shaft 302 and the positioning shaft 301 , and a rigid spacer 304 is sleeved on the outer side of the protruding shaft 302 . The spacer is cylindrical.

[0022] By applying a certain amount of pressure on the tailpiece 1, the elastic deformable element is forced to press the forged blank 2, so that the blank cylinder is centered through the inner hole and transmits the rotational force of the lathe. Replacing the rigid spacer 304 between the two elastic elements can achieve rough machining of deep products.

[0023] By using this method to replace the original process of clamping the outer cylindrical surface, aligning the other end face and processing, this method does not require careful alignment. It only needs to put the workpiece on the positioning fixture 3, and then use the tail top 1 to automatically align it. This method is simple, convenient and efficient, reduces the clamping time of the machined parts, and improves production efficiency.

[0024] Preferably, the elastic support ring 303 and the rigid spacer 304 are provided in several groups, all of which are sleeved on the outer wall of the top shaft and distributed at intervals.

[0025] Preferably, the top end surface of the rigid spacer 304 farthest from the end of the positioning shaft 301 slightly protrudes from the top end surface of the protruding shaft 302 .

[0026] Preferably, the diameter of the elastic support ring 303 is larger than the diameter of the rigid spacer 304 .

[0027] Preferably, the outer wall of the elastic support ring 303 is in close contact with the inner wall of the forging blank 2 .

[0028] Preferably, the outer wall of the elastic support ring 303 is provided with anti-slip grooves to increase friction and enhance the positioning effect on the inner wall of the forging blank 2.

[0029] Preferably, a groove is formed on the side wall of the elastic support ring 303 for positioning the adjacent rigid spacer 304 .

[0030] The positioning fixture 3 is composed of a tail top 1, a forging blank 2, a positioning fixture 3, a lathe chuck 4, etc. When in use, the forging blank 2 is directly placed on the positioning fixture 3 and the tail top 1 is pushed tightly. Figure 2 As shown, the elastic support ring 303 undergoes elastic deformation, forcing the forging blank 2 to self-center and tighten the forging blank 2. The chuck 4 clamps the positioning shaft 301 to drive the blank to rotate, thereby achieving rough processing on the lathe.

[0031] The positioning fixture 3 is composed of a positioning shaft 301, a convex shaft 302, an elastic support rigid spacer 304 and other parts. During installation, according to the blank to be processed, a suitable rigid spacer 304 is selected to position the elastic support at the bottom and mouth of the forging blank 2, ensuring that the elastic support can reliably position and support the machined blank, and can reliably drive the blank to perform machining and cutting work. By reasonably selecting the length of the top spacer of the positioning fixture 3, it is ensured that the top of the positioning fixture 3 can contact the bottom of the forging blank 2 after tightening, which can ensure the consistency of the bottom thickness of the product and reduce the need to measure the bottom thickness in the subsequent processing steps. This method is simple, effective and reliable, with low production and manufacturing costs, and is suitable for the rough processing needs of large quantities of such products with multiple varieties and specifications.

[0032] Preferably, a groove is formed on the side wall of the elastic support ring 303 for positioning the adjacent rigid spacer 304 .

[0033] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0035] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0036] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0037] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A simple internal support fixture for machining, comprising: A chuck (4), a forging blank (2), a positioning fixture (3), a positioning shaft (301) and a tail top (1), wherein the tail end of the positioning fixture (3) is positioned on the chuck (4), the positioning shaft (301) is used to position the inner wall of the forging blank (2), and the tail top (1) is used to abut against the bottom of the forging blank (2), and is characterized in that: the positioning fixture (3) includes a positioning shaft (301) and a convex shaft (302), the convex shaft (302) is located at the top of the positioning shaft (301), the diameter of the positioning shaft (301) is larger than the diameter of the convex shaft (302), and the axes of the positioning shaft (301) and the convex shaft (302) coincide with each other; An elastic support ring (303) is sleeved on the connection between the convex shaft (302) and the positioning shaft (301), and a rigid spacer (304) is sleeved on the outer side of the convex shaft (302), wherein the spacer is cylindrical.

2. A simple internal support fixture for machining according to claim 1, characterized in that: The elastic support ring (303) and the rigid spacer (304) are provided in several groups, all of which are sleeved on the outer wall of the top shaft and distributed at intervals.

3. A simple internal support fixture for machining according to claim 2, characterized in that: The top end surface of the rigid spacer (304) farthest from one end of the positioning shaft (301) slightly protrudes from the top end surface of the convex shaft (302).

4. A simple internal support fixture for machining according to claim 1, characterized in that: The diameter of the elastic support ring (303) is larger than the diameter of the rigid spacer (304).

5. A simple internal support fixture for machining according to claim 1, characterized in that: The outer wall of the elastic support ring (303) is tightly fitted to the inner wall of the forging blank (2).

6. A simple internal support fixture for machining according to claim 5, characterized in that: The outer side wall of the elastic support ring (303) is provided with anti-slip grooves.

7. A simple internal support fixture for machining according to claim 5, characterized in that: The side wall of the elastic support ring (303) is provided with a groove for positioning the adjacent rigid spacer (304).

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