End face clamping device and method for a machine tool

Abstract

The present application provides an end face clamping device of a machine tool, comprising a center, a spindle head mounting disc, a traction disc, a traction pin, a thrust bearing, a spring, a traction positioning column and a traction pin seat, the spindle head mounting disc is fixedly connected with the traction disc, the traction disc is fixedly connected with the traction positioning column, the traction positioning column is provided with a first through hole, a traction pin seat limiting hole and a second through hole matched with the center, the axis of the traction pin seat limiting hole and the second through hole coincides with the axis of the traction positioning column, and the first through hole is an eccentric hole. The present application also provides an end face clamping method of a machine tool. The beneficial effect of the present application is that the eccentric hole driving mode solves the problem of multiple clamping of traditional workpieces, and can be used for workpieces with relatively short length, only the end face of the workpiece is clamped and driven, and the axial space of the workpiece is not occupied.

Description

TECHNICAL FIELD

[0001] The present application relates to a grinding machine, in particular to an end face clamping device and method of a machine tool. BACKGROUND

[0002] When grinding the size of both ends of a product, the traditional clamping method needs to clamp one end of the product and grind the other end, so at least two clamping operations are needed for one product. Multiple clamping operations for the same product can easily lead to a decrease in product accuracy, especially the concentricity of both ends of the product. At the same time, multiple clamping operations are time-consuming and laborious, and the production efficiency is low. In some products, there is no enough space in the center axis direction to install the clamping device (i.e. the length of the product is not enough), so one-time clamping of the product to complete the machining of the workpiece becomes a problem. SUMMARY

[0003] In order to solve the problems in the prior art, the present application provides an end face clamping device and method of a machine tool.

[0004] The present application provides an end face clamping device of a machine tool, comprising a center, a spindle head mounting disc, a traction disc, a traction pin, a thrust bearing, a spring, a traction positioning column and a traction pin seat, the spindle head mounting disc is fixedly connected with the traction disc, the traction disc is fixedly connected with the traction positioning column, the traction positioning column is provided with a first through hole, a traction pin seat limiting hole for limiting the axial position of the traction pin seat and a second through hole matched with the center, the axial lines of the traction pin seat limiting hole and the second through hole coincide with the axial line of the traction positioning column, the first through hole is an eccentric hole, the traction pin seat is arranged in the traction pin seat limiting hole, the traction pin is divided into three parts along its axial direction, which are a head end inserted into the eccentric hole of the end face of the workpiece, a middle part and a tail end, the middle part of the traction pin is arranged in the first through hole, the tail end of the traction pin is fixedly connected with the traction pin seat, the thrust bearing is axially positioned and installed on the center, the spring is clamped between the thrust bearing and the traction pin seat, and the center sequentially penetrates through the spindle head mounting disc, the traction disc and the traction positioning column.

[0005] As a further improvement of the present application, the first through hole and the second through hole intersect to form an opening structure in which the traction pin can be offset to the center, and the axial projection of the first through hole is located in the traction pin seat limiting hole.

[0006] As a further improvement of the present application, the diameter of the middle part of the traction pin is greater than that of the head end and the tail end, and the diameter of the middle part of the traction pin is smaller than the hole diameter of the first through hole.

[0007] As a further improvement of the present application, the diameter of the middle part of the traction pin is at least 0.5mm smaller than the hole diameter of the first through hole.

[0008] As a further improvement of the present application, the tail end of the pulling pin is threadedly connected with the pulling pin seat, the pulling pin seat is provided with an annular groove for accommodating the spring, the head end of the pulling pin has a diameter of at least 0.2 mm smaller than the hole diameter of the eccentric hole of the workpiece end face, and the head end of the pulling pin is provided with a chamfer.

[0009] As a further improvement of the present application, the pulling pin has two and is symmetrically arranged, the center point, the spindle head mounting disc, the pulling disc, the thrust bearing, the spring, the pulling positioning column and the pulling pin seat are coaxially arranged, and the pulling pin is eccentrically arranged.

[0010] As a further improvement of the present application, the middle part of the center point is provided with a step, the step divides the side surface of the center point into a high step surface and a low step surface, the spindle head mounting disc is arranged on the high step surface of the center point, the thrust bearing is tightly arranged on the step of the center point, the spring is sleeved on the low step surface of the center point, and the pulling pin seat is arranged on the low step surface of the center point.

[0011] As a further improvement of the present application, the spindle head mounting disc is fixedly arranged on the main shaft of the machine tool, one end of the high step surface of the center point is connected with the machine tool, and one end of the low step surface of the center point is arranged on the center hole of the end face of the workpiece.

[0012] As a further improvement of the present application, the pulling pin seat is in a circular ring shape, the pulling positioning column is in a sleeve shape, and the pulling disc is sleeved outside the thrust bearing.

[0013] As a further improvement of the present application, the outer diameter of the pulling pin seat is at least 0.5 mm smaller than the hole diameter of the pulling pin seat limiting hole of the pulling positioning column.

[0014] The present application also provides an end face clamping method of a machine tool, and the end face clamping device of the machine tool is used to clamp as follows:

[0015] One end of the workpiece is clamped by the end face clamping device of the machine tool, wherein the head end of the pulling pin is inserted into the eccentric hole of the workpiece end face, the center point is arranged on the center hole of the workpiece, and the other end of the workpiece is clamped by the center point.

[0016] The present application has the beneficial effect that the above-mentioned scheme solves the problem of multiple clamping of the traditional workpiece by using the eccentric hole driving mode, and can be used for the workpiece with a relatively short length, and only the end face of the workpiece is clamped and driven, without occupying the axial space of the workpiece. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments description will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other solutions can be obtained based on these drawings without creative effort.

[0018] Figure 1 is a cross-sectional view of an end face clamping device of a machine tool.

[0019] Figure 2 is a partial enlarged view of a pulling and rotating pin seat of the end face clamping device of the machine tool.

[0020] Figure 3 is an assembly view of the end face clamping device of the machine tool.

[0021] Figure 4 is an exploded view of the end face clamping device of the machine tool.

[0022] Figure 5 is a front view of a pulling and rotating pin of the end face clamping device of the machine tool.

[0023] Figure 6 is a perspective view of the pulling and rotating pin of the end face clamping device of the machine tool.

[0024] Figure 7 is a front view of a pulling and rotating pin seat of the end face clamping device of the machine tool.

[0025] Figure 8 is a cross-sectional view A-A of Figure 7 .

[0026] Figure 9 is a front view of a pulling and rotating positioning column of the end face clamping device of the machine tool.

[0027] Figure 10 is a cross-sectional view B-B of the longer 9. DETAILED DESCRIPTION

[0028] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0029] In the description of the present application, it needs to be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the scope of protection of the present application. In addition, the terms "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" and the like can be explicitly or implicitly included one or more. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0030] In the description of the present application, it needs to be understood that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood through specific circumstances.

[0031] The present application will be further described below in conjunction with the description and specific embodiments of the drawings.

[0032] As Figures 1 to 9 shown, an end face clamping device of a machine tool, comprising a center 2, a spindle head mounting disc 1, a traction disc 3, a traction pin 4, a thrust bearing 5, a spring 6, a traction positioning column 7 and a traction pin seat 9.

[0033] The spindle head mounting disc 1 and the traction disc 3 are fixedly connected by bolts.

[0034] The traction disc 3 and the traction positioning column 7 are fixedly connected by bolts.

[0035] The traction positioning column 7 is provided with a first through hole 71, a traction pin seat limiting hole 72 and a second through hole 73 matched with the center 2, the axes of the traction pin seat limiting hole 72 and the second through hole 73 coincide with the axis of the traction positioning column 7, the first through hole 71 is an eccentric hole, the traction pin seat 9 is arranged in the traction pin seat limiting hole 72, and the traction pin seat limiting hole 72 limits the axial position of the traction pin seat 9.

[0036] The pulling pin 4 is divided into three parts along its axial direction, namely a head end 43 inserted into the eccentric hole of the workpiece end face, a middle part 42 and a tail end 41, the middle part 42 of the pulling pin 4 is arranged in the first through hole 71, and the tail end 41 of the pulling pin 4 is fixedly connected with the pulling pin seat 9.

[0037] The spring 6 is arranged between the pulling pin seat 9 and the thrust bearing 5, which can provide a retreat space for the pulling pin 4, is convenient to install and disassemble, can provide elastic force for the pulling pin 4, so that the pulling pin 4 can be inserted into the eccentric hole of the workpiece end face of the workpiece 8 and kept in a pressed state, and in addition, the spring 6 can also make the workpiece have an automatic alignment function.

[0038] The tail end 41 of the pulling pin 4 is fixedly connected with the pulling pin seat 9.

[0039] The first through hole 71 and the second through hole 73 intersect to form an opening structure for providing a space for the pulling pin 4 to move, so that the pulling pin 4 arranged in the first through hole 71 has a movable space to offset to the center, and the pulling pin 4 can offset to the center at the beginning of work, which is beneficial to improve the coaxiality and can ensure that the center of the workpiece is concentric with the main shaft of the machine tool.

[0040] The axial projection of the first through hole 71 is located in the pulling pin seat limiting hole 72.

[0041] The diameter of the middle part 42 of the pulling pin 4 is greater than that of the head end 43 and the tail end 41, and the diameter of the middle part 42 of the pulling pin 4 is less than the hole diameter of the first through hole 71.

[0042] The diameter of the middle part 42 of the pulling pin 4 is less than the hole diameter of the first through hole 71 by at least 0.5 mm.

[0043] The tail end 41 of the pulling pin 4 is threadedly connected with the pulling pin seat 9, the pulling pin seat 9 is provided with an annular groove 93 for accommodating the spring 6, the diameter of the head end 73 of the pulling pin 4 is less than the hole diameter of the eccentric hole of the workpiece end face of the workpiece 8 by at least 0.2 mm, and the head end 43 of the pulling pin 4 is provided with a chamfer.

[0044] The tail end 41 of the pulling pin 4 is threadedly connected with the pulling pin seat 9, the pulling pin seat 9 is provided with an annular groove 93 for accommodating the spring 6, the diameter of the head end 73 of the pulling pin 4 is less than the hole diameter of the eccentric hole of the workpiece end face of the workpiece 8 by at least 0.2 mm, and the head end 43 of the pulling pin 4 is provided with a chamfer.

[0045] The middle part of the center 2 is provided with a step 23, the step 23 divides the side surface of the center 2 into a high step surface 21 and a low step surface 22, the spindle head mounting disc 1 is installed on the high step surface 21 of the center 2, the thrust bearing 5 is tightly attached on the step 23 of the center 2, the spring 6 is sleeved on the low step surface 22 of the center 2, and the pulling pin seat 9 is installed on the low step surface 22 of the center 2.

[0046] The spindle head mounting disc 1 is fixedly installed on the main shaft of the machine tool, one end of the high step surface 21 of the center 2 is connected with the machine tool, and one end of the low step surface 22 of the center 2 is abutted on the center hole of the end surface of the workpiece 8.

[0047] The pulling pin seat 9 is in a circular ring shape, the pulling positioning column 7 is in a sleeve shape, and the pulling disc 3 is sleeved outside the thrust bearing 5.

[0048] The pulling pin 4 is symmetrically provided with two.

[0049] The tail end 41 of the pulling pin 4 is provided with external threads, which can be connected with the threaded holes 91 of the pulling pin seat 9,

[0050] The middle part 42 of the pulling pin 4 is an external circle and is sleeved into the first through hole 71 with a notch of the pulling positioning column 9.

[0051] The head part 43 of the pulling pin 4 is an external circle connected with the eccentric hole of the end surface of the workpiece, the external diameter of the external circle is smaller than the inner hole size of the eccentric hole of the workpiece by at least 0.2 mm, the workpiece can be conveniently disassembled and assembled, and the combination of the end round corner and the chamfer can protect the workpiece from being damaged and facilitate disassembly and assembly of the workpiece.

[0052] The spindle head mounting disc is provided with a center through hole for the center 2 to pass through.

[0053] The pulling disc 3 is provided with a center through hole for installing the thrust bearing 5.

[0054] The application also provides an end face clamping method of a machine tool, and the end face clamping device of the machine tool is used to clamp as follows:

[0055] One end of the workpiece 8 is clamped by the end face clamping device of the machine tool, wherein the head end 43 of the pulling pin 4 is inserted into the eccentric hole of the end surface of the workpiece 8, the center 2 is abutted on the center hole of the workpiece 8, and the other end of the workpiece is clamped by a traditional center.

[0056] The pulling pin seat 9 is designed with a threaded hole 91 connected with the pulling pin 4, an annular groove 93 for fixing the spring 6, and a central through hole 92 for the center pin 2 to pass through, the small end of the center pin 2 passes through the central through hole 92 of the pulling pin seat 9 and is connected with the workpiece, and the outer diameter of the pulling pin seat 9 is at least 0.5 mm smaller than the size of the pulling pin seat limiting hole 72 of the pulling positioning column 7. The contact between the pulling pin seat 9 and the pulling positioning column 7 is prevented during work, and the service life of the product is improved.

[0057] The thrust bearing 5 is arranged between the spring 6 and the center pin 2, which can prevent the friction between the spring 6 and the center pin 2, improve the service life of the product, and provide a force for the spring 6 to move towards the workpiece, which is beneficial to the clamping of the workpiece. When the machine stops moving, the elastic force of the spring 6 towards the thrust bearing 5 is beneficial to the disassembly of the workpiece.

[0058] The end face clamping device of the machine tool provided by the application has the following advantages:

[0059] The spindle head mounting disc 1 is installed on the machine tool spindle, one end of the high step surface 21 of the center pin 2 passes through the central through hole of the spindle head mounting disc 1 and is installed in the corresponding position of the machine tool, the thrust bearing 5 is installed on the step 23 of the center pin 2, and the spring 6 is installed on the low step surface 22 of the center pin 2. The tail end 41 of the two pulling pins 4 is installed in the threaded hole 91 of the pulling pin seat 9, the pulling pin seat 9 with the pulling pin 4 is installed in the pulling pin seat limiting hole 72 of the pulling positioning column 7, the pulling positioning column 7 is connected with the pulling disc 3, the pulling disc 3 passes through the low step surface 22 of the center pin 2 and is connected with the spindle head mounting disc 1, the spring 6 is installed in the annular groove 93 of the pulling pin seat 9, and the pulling disc 3 is locked and fixed by bolts. When the workpiece is machined, the head end 43 of the pulling pin 4 penetrates into the eccentric hole of the end face of the workpiece, and the workpiece can be directly replaced during disassembly, which is convenient to operate.

[0060] The end face clamping device of the machine tool provided by the application has the following advantages:

[0061] The end face clamping device of the machine tool provided by the application has the following advantages:

[0062] 1. The end face eccentric hole driving device realizes one-time clamping of both ends of the product, reduces the clamping error of the product, improves the machining precision of the product, especially the concentricity of both ends of the product, reduces the clamping time of the product, and improves the production efficiency of the product, especially when mass production is particularly significant.

[0063] 2. The end face eccentric hole driving device has the advantages of simple structure, convenient manufacturing, low cost, safety and reliability.

[0064] 3. The end face eccentric hole driving device has the advantages of convenient clamping and positioning, safe operation, stable work, high production efficiency, and convenient disassembly.

[0065] 4. The end face eccentric hole driving device has an automatic alignment function, utilizes the spring force to push the pulling pin seat forward to realize automatic clamping and positioning of the workpiece.

[0066] 5. The end face eccentric hole driving device is provided with a thrust bearing 5 between the spring and the center, which can prevent friction between the spring and the center, improve the service life of the product, and provide a force for the spring to move towards the workpiece, which is beneficial to the clamping of the workpiece. When the machine stops moving, the spring force in the direction of the thrust bearing is beneficial to the disassembly of the workpiece.

[0067] 6. The end face eccentric hole driving device solves the problem of not being able to center the end face eccentric hole and complete the machining by one-time clamping in the prior art.

[0068] The end face clamping device of the machine tool provided by the present application is widely used in the field of mechanical product machining and manufacturing, and can be used for precise grinding of the outer circle of a grinding machine.

[0069] The above content is a further detailed description of the present application in combination with specific preferred embodiments, and cannot be considered as limiting the specific implementation of the present application to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, some simple deductions or substitutions can be made without departing from the concept of the present application, and all of them should be considered as falling within the protection scope of the present application.

Claims

1. An end face clamping device for a machine tool, characterised in that: The device comprises a center, a main shaft head mounting disc, a traction disc, a traction pin, a thrust bearing, a spring, a traction positioning column and a traction pin seat, the main shaft head mounting disc is fixedly connected with the traction disc, the traction disc is fixedly connected with the traction positioning column, the traction positioning column is provided with a first through hole, a traction pin seat limiting hole for limiting the axial position of the traction pin seat and a second through hole matched with the center, the axial lines of the traction pin seat limiting hole and the second through hole coincide with the axial line of the traction positioning column, the first through hole is an eccentric hole, the traction pin seat is arranged in the traction pin seat limiting hole, the traction pin is divided into a head end, a middle part and a tail end along the axial direction of the traction pin, the head end is inserted into the eccentric hole of the workpiece end face, the middle part is arranged in the first through hole, the tail end is fixedly connected with the traction pin seat, the thrust bearing is axially positioned and mounted on the center, the spring is clamped between the thrust bearing and the traction pin seat, the center passes through the main shaft head mounting disc, the traction disc and the traction positioning column in sequence, the first through hole intersects with the second through hole to form an opening structure in which the traction pin can be offset to the center, the axial projection of the first through hole is located in the traction pin seat limiting hole, the diameter of the middle part of the traction pin is larger than that of the head end and the tail end, and the diameter of the middle part of the traction pin is smaller than the hole diameter of the first through hole.

2. The end facing chucking device of claim 1, wherein: The diameter of the middle part of the traction pin is smaller than the hole diameter of the first through hole by at least 0.5 mm.

3. The end facing clamp apparatus of claim 1 wherein: The tail end of the traction pin is threadedly connected with the traction pin seat, the traction pin seat is provided with an annular groove for accommodating the spring, the diameter of the head end of the traction pin is smaller than the hole diameter of the eccentric hole of the workpiece end face by at least 0.2 mm, and the head end of the traction pin is provided with a chamfer.

4. The end facing clamp apparatus of claim 1 wherein: The traction pin has two and is symmetrically arranged, the center, the main shaft head mounting disc, the traction disc, the thrust bearing, the spring, the traction positioning column and the traction pin seat are coaxially mounted, and the traction pin is eccentrically mounted.

5. The end facing clamp apparatus of claim 1 wherein: The middle part of the center is provided with a step, the step divides the side surface of the center into a high step surface and a low step surface, the main shaft head mounting disc is mounted on the high step surface of the center, the thrust bearing is tightly arranged on the step of the center, the spring is sleeved on the low step surface of the center, and the traction pin seat is mounted on the low step surface of the center.

6. An end facing clamp device for a machine tool as claimed in claim 5, wherein: The main shaft head mounting disc is fixedly mounted on a machine tool spindle, one end of the high step surface of the center is connected with the machine tool, and one end of the low step surface of the center is abutted on the center hole of the end face of a workpiece.

7. The end facing clamping device of claim 1 wherein: The traction pin seat is in a circular ring shape, the traction positioning column is in a sleeve shape, the traction disc is sleeved outside the thrust bearing, and the outer diameter of the traction pin seat is smaller than the hole diameter of the traction pin seat limiting hole of the traction positioning column by at least 0.5 mm.

8. An end face clamping method of a machine tool, characterized by: The end face clamping device of the machine tool is used to clamp as follows: One end of a workpiece is clamped by the end face clamping device of the machine tool, wherein the head end of the traction pin is inserted into the eccentric hole of the workpiece end face, and the center is abutted on the center hole of the workpiece, and the other end of the workpiece is clamped by the center.

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