Fixture for machining short shaft hole

Abstract

The invention relates to a clamp for machining a short shaft hole. The clamp comprises a bottom plate, a pressing plate, a positioning seat connected with the bottom plate and the pressing plate, and a positioning shaft. The bottom plate and the pressing plate clamp the two ends of the short shaft. The positioning shaft penetrates through a part hole in the short shaft, and the two ends of the positioning shaft are connected with the bottom plate and the pressing plate. The pressing plate is provided with a through hole corresponding to a to-be-machined hole of the short shaft. The clamp can stably clamp the short shaft, and the precision of a machining hole in the short shaft is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical processing, and more specifically, to a clamp for processing a short shaft hole. Background Art

[0002] At present, when drilling holes on short shafts, a simple fixture is used to position and fix the short shaft, and then the processing equipment drills the process hole to be processed on the short shaft. During the drilling process, due to vibration and other reasons, the current fixture cannot ensure that the short shaft will not deviate during the processing, which ultimately affects the quality of the processed hole and the processing hole accuracy cannot meet the requirements.

[0003] Prior art CN105364557A discloses a fixture for processing holes in a reducer housing, comprising a base, a first pressure plate and a second pressure plate, wherein the first pressure plate and the second pressure plate are arranged at the upper end of the base, and the base comprises a bottom plate and positioning plates on both sides of the bottom plate, each positioning plate is provided with two positioning holes, the first pressure plate is provided with two, respectively located at opposite positions on the left and right sides of the upper end of the bottom plate, the second pressure plate is provided with two, respectively located at opposite positions on the front and back sides of the upper end of the bottom plate, and a number of through holes are evenly distributed on the bottom plate.

[0004] The technical solution disclosed in the prior art uses a first pressing plate and a second pressing plate to fix the parts to be processed in four directions, front, back, left, and right, to prevent the parts to be processed from shifting during the processing. However, it can only fix the parts to be processed in the horizontal direction, and cannot fix the parts to be processed in the vertical direction. There is also the problem that the precision of the processed holes does not meet the standards. Summary of the invention

[0005] The invention provides a fixture for machining a short-axis hole which can improve the machining hole precision.

[0006] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0007] Disclosed is a fixture for machining short-axis holes, the fixture comprising a base plate, a pressure plate, a positioning shaft, and a positioning seat connecting the base plate and the pressure plate; the short axis is placed between the base plate and the pressure plate, the positioning shaft passes through the part hole on the short axis, and both ends of the positioning shaft are connected to the base plate and the pressure plate; the pressure plate is a disc pressure plate, and the disc pressure plate is provided with through holes corresponding to the holes to be machined in the short axis.

[0008] Preferably, the base plate and the positioning seat are connected via positioning columns.

[0009] Preferably, the positioning shaft and the base plate are connected via hexagon socket bolts.

[0010] Preferably, a positioning hole which is interference fit with the positioning shaft is provided on the bottom plate.

[0011] Preferably, the positioning shaft and the pressure plate are connected via a cylindrical pin and a shouldered hexagonal nut.

[0012] Preferably, the pressing plate and the positioning seat are connected via a latch.

[0013] Preferably, a connecting hole for connecting the positioning shaft is provided on the pressing plate.

[0014] Preferably, the connecting hole is arranged at the center of the disc pressure plate, and the through hole is arranged along the circumferential direction of the disc pressure plate.

[0015] Preferably, a convex table surface is provided on the disc, and the connecting hole is provided on the convex table surface.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The short shaft is fixed in all directions through the base plate, pressure plate and connecting shaft to avoid the deviation of the short shaft during processing and improve the hole accuracy.

[0018] 2. The pressing plate is provided with a model through hole corresponding to the hole to be processed, so as to further improve the accuracy of the processed hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a fixture for machining short-axis holes of the present invention;

[0020] Figure 2 A top view of a pressing plate of a fixture for machining short-axis holes according to the present invention;

[0021] Figure 3 A side view of a pressing plate of a fixture for machining short-axis holes according to the present invention;

[0022] Figure 4 It is a schematic diagram of the connection structure between the positioning seat and the pressing plate of a fixture for machining short-axis holes of the present invention;

[0023] Figure 5 The present invention is a schematic diagram of a pin structure of a fixture for machining short-axis holes. DETAILED DESCRIPTION

[0024] In order to clearly illustrate the technical features of the present solution, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0025] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0026] In addition, in the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0027] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0028] In the present application, unless otherwise clearly specified and limited, a first feature "above" or "below" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0029] Example 1

[0030] like Figures 1 to 3As shown, a fixture for processing short shaft holes is disclosed, the fixture includes a base plate 1, a pressure plate 2, a positioning seat 3 connecting the base plate 1 and the pressure plate 2, and a positioning shaft 4; the short shaft 9 is placed between the base plate 1 and the pressure plate 2, the positioning shaft 4 passes through the part hole on the short shaft 9, and the two ends of the positioning shaft 4 are connected to the base plate 1 and the pressure plate 2; the pressure plate 2 is a disc pressure plate, and the disc pressure plate is provided with a through hole 10 corresponding to the hole to be processed in the short shaft 9.

[0031] As a component to be drilled, the short shaft 9 needs to be fixed in all directions to prevent the short shaft from being offset during the machining process and affecting the drilling accuracy of the short shaft 9. Since the short shaft 9 is a cylindrical structure, conventional clamping mechanisms such as chucks cannot clamp and fix the short shaft 9 at all.

[0032] In this embodiment, the fixing of the short shaft 9 mainly includes two fixing methods. The first fixing method is: the short shaft 9 to be processed is fixed up and down by the bottom plate 1 and the pressing plate 2. Specifically, the lower end of the short shaft 9 is connected to the upper surface of the bottom plate 1, and the upper end of the short shaft 9 is connected to the lower surface of the pressing plate 2. The short shaft 9 is limited in the vertical direction by the bottom plate 1 and the pressing plate 2. During the processing, the short shaft 9 cannot be vertically displaced under the clamping action of the bottom plate 1 and the pressing plate 2.

[0033] The second fixing method is that the short shaft 9, the bottom plate 1 and the pressure plate 2 are connected to the positioning shaft 4 together, specifically, the positioning shaft 4 passes through the part hole on the short shaft 9, and the two ends of the positioning shaft 4 are respectively fixedly connected to the bottom plate 1 and the pressure plate 2. After the two ends of the positioning shaft 4 are respectively fixed by the bottom plate 1 and the pressure plate 2, the positioning shaft 4 will not deviate left and right, and naturally, the short shaft 9 sleeved with the positioning shaft 4 will not deviate left and right.

[0034] Finally, the short shaft 9 is fixed in all directions through two fixing methods, which effectively prevents the short shaft 9 from being displaced in the left and right and vertical directions during the drilling process, thereby ensuring the accuracy of the holes processed on the short shaft 9 when other equipment performs drilling processing on the short shaft 9.

[0035] The pressure plate 2 is set to be disc-shaped. When the center of the disc is used as the positioning coordinate, the corresponding through hole, that is, the model hole, can be drilled on the disc more accurately. The aperture and relative position of the model hole are consistent with the aperture and position of the hole to be processed on the short shaft 9. With the through hole 10 as a reference, the drill bit of the drilling equipment is directly aligned with the through hole 10 for drilling, and the hole to be processed on the short shaft 9 can be directly drilled on the short shaft 9. When the drilling equipment is aligned with the through hole 10 to drill the short shaft 9, the accuracy of the processed hole on the short shaft 9 will also be higher. It is further ensured that the accuracy and quality of the processed holes meet the requirements.

[0036] The two ends of the positioning seat 2 are connected to the base 1 and the pressure plate 2. The role of the positioning seat 2 is to protect the stability of the overall structure of the fixture and prevent shaking. The positioning seat 2 can be a frame structure, and its role is to ensure the stability of the connection between the pressure plate 2 and the bottom plate 1. At the same time, it is also convenient to reduce the weight of the fixture and facilitate the removal of iron filings and cooling.

[0037] Example 2

[0038] Disclosed is a fixture for machining short-axis holes, the fixture comprising a base plate 1, a pressure plate 2, a positioning seat 3 connecting the base plate 1 and the pressure plate 2, and a positioning shaft 4; the short axis 9 is placed between the base plate 1 and the pressure plate 2, the positioning shaft 4 passes through the part hole on the short axis 9, and the two ends of the positioning shaft 4 are connected to the base plate 1 and the pressure plate 2; the pressure plate 2 is provided with a through hole 10 corresponding to the hole to be machined on the short axis 9.

[0039] The difference between this embodiment and the first embodiment is that the bottom plate 1 and the positioning seat 3 can be connected by the positioning column 5. Specifically, positioning grooves can be provided on the upper surface of the bottom plate 1 and the lower surface of the positioning seat 3, and the positioning column 5 is installed in the positioning groove. The advantage of this design is that it not only improves the stability between the positioning seat 3 and the bottom plate 1, but also has a higher connection accuracy and is more convenient for installation and disassembly.

[0040] In order to ensure the connection stability between the positioning shaft 4 and the base plate 1, a variety of connection methods can be adopted between the positioning shaft 4 and the base plate 1. Specifically, the positioning shaft 4 and the base plate 1 can be connected by a hexagon socket bolt, or a positioning hole can be set on the base plate 1, and the positioning shaft 4 and the base plate 1 are connected by interference fit through the positioning hole.

[0041] In practical applications, when the base plate 1 and the positioning shaft 4 are connected by interference fit, the clamping force of the positioning shaft 4 is better, the offset is less, and the final machining hole accuracy on the short shaft 9 is higher. Therefore, the base plate 1 and the positioning shaft 4 are preferably connected by interference fit.

[0042] The positioning seat 3 and the pressing plate 2 can be connected by a cylindrical latch 6 and a shouldered hexagonal nut 7. The pressing plate 2 and the positioning seat 3 are connected by the latch 6, which can not only reduce the connection gap between the positioning seat 3 and the pressing plate 2, and improve the hole processing accuracy of the short shaft 9, but also make the overall structure more stable and more convenient to install.

[0043] The height design of the shouldered hexagonal nut 7 is related to the depth of the tool. Assuming the height of the nut is h, and the tool overhang length on the processing equipment is x, in order to ensure that the tool does not interfere with the shouldered hexagonal nut and to ensure that the tool overhang length is minimized, the following solutions should be met:

[0044] h=x+safety distance n

[0045] Note: The safety distance n is the minimum value for the tool not to interfere with the shouldered hexagonal nut 7.

[0046] Example 3

[0047] Disclosed is a fixture for machining short-axis holes, the fixture comprising a base plate 1, a pressure plate 2, a positioning seat 3 connecting the base plate 1 and the pressure plate 2, and a positioning shaft 4; the short axis 9 is placed between the base plate 1 and the pressure plate 2, the positioning shaft 4 passes through the part hole on the short axis 9, and the two ends of the positioning shaft 4 are connected to the base plate 1 and the pressure plate 2; the pressure plate 2 is provided with a through hole 10 corresponding to the hole to be machined on the short axis 9.

[0048] The difference between this embodiment and the above embodiment is that a connection hole 11 connected to the positioning shaft 4 is provided on the pressing plate 2. Specifically, the pressing plate 2 can be set in a disc shape, and the connection hole 11 is set at the center of the disc 2. When the holes to be processed are arranged in a circle, the corresponding through holes 10 on the pressing plate 2 are set along the circumferential direction of the disc.

[0049] Specifically, a convex table 12 can be provided on the end portion where the pressing plate 2 is connected to the positioning seat 3, and the connecting hole 11 is provided on the convex table 12. Specifically, the cross section of the convex table 12 is a trapezoid. The top size of the convex table 12 is just slightly smaller than the size of other process through holes on the short shaft 9. When the fixture fixes the short shaft 9, part of the structure of the convex table 12 is located in other process through holes of the short shaft 9. The convex table 12 is provided on the disc, thereby further fastening the short shaft 9. At the same time, it can also provide preliminary positioning when installing and fixing the short shaft 9, reducing the assembly time of the short shaft 9 and the fixture, thereby improving the processing efficiency.

[0050] In order to facilitate carrying of the base plate 1 , a handle 8 may be provided on the side wall of the base plate 1 .

[0051] Example 4

[0052] The difference between this embodiment and the above-mentioned embodiment is that the installation and operation method of the clamp are disclosed.

[0053] First, fix the base 1 on the processing platform of the processing equipment, fix the base 1 by bolts or calipers, and then assemble the positioning seat 3 and the positioning shaft 4 with the base 1 in turn, and then put the short shaft 9 on the positioning shaft 4, and align the pressure plate 2 with the positioning shaft 4 and the positioning seat 3, so as to realize the assembly of the pressure plate 2. At this time, the fixture is assembled and the short shaft 9 is fixed in all directions. The processing equipment starts to drill the short shaft 9. After the processing is completed, remove the pressure plate 2, and then remove the short shaft 9.

[0054] Obviously, the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A fixture for machining short-axis holes, characterized in that: The fixture includes a base plate, a pressure plate, a positioning shaft, and a positioning seat connecting the base plate and the pressure plate; the short shaft is placed between the base plate and the pressure plate, the positioning shaft passes through the part hole on the short shaft, and the two ends of the positioning shaft are connected to the base plate and the pressure plate; the pressure plate is a disc pressure plate, and the disc pressure plate is provided with a through hole corresponding to the hole to be processed in the short shaft.

2. A jig for machining short-axis holes according to claim 1, characterized in that: The bottom plate and the positioning seat are connected via positioning columns.

3. A jig for machining short-axis holes according to claim 1, characterized in that: The positioning shaft and the base plate are connected via hexagon socket bolts.

4. A jig for machining a short-axis hole according to claim 1, characterized in that: The bottom plate is provided with a positioning hole which is interference fit with the positioning shaft.

5. The jig for machining a short-axis hole according to claim 1, characterized in that: The positioning shaft and the pressing plate are connected via a cylindrical pin and a shouldered hexagonal nut.

6. A jig for machining a short-axis hole according to claim 1, characterized in that: The pressing plate and the positioning seat are connected via a latch.

7. A jig for machining a short-axis hole according to claim 1, characterized in that: The pressing plate is provided with a connecting hole for connecting the positioning shaft.

8. A jig for machining a short-axis hole according to claim 7, characterized in that: The connecting hole is arranged at the center of the disc pressure plate, and the through hole is arranged along the circumferential direction of the disc pressure plate.

9. A jig for machining a short-axis hole according to claim 8, characterized in that: The disc is provided with a convex table surface, and the connecting hole is provided on the convex table surface.

10. A jig for machining a short-axis hole according to claim 9, characterized in that: The cross section of the convex table surface is a trapezoid.

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