A milling machine clamping and fixing device and a keyway processing system

Abstract

The utility model relates to a kind of milling machine clamping fixing device and keyway processing system, milling machine clamping fixing device includes base unit, positioning unit, clamping unit, locking unit and eccentric clamping unit. Its advantage is, the surface hole of workpiece is matched using locking unit, prevent workpiece rotation and along axial displacement;Using the clamping unit of V type and eccentric compression unit cooperation, clamping is carried out to workpiece, using eccentric wheel principle makes that compression degree is moderate, not in the surface of workpiece forms indentation;Workpiece is flexibly and conveniently disassembled, saves operation time cost;It is convenient to mill processing to batch workpiece, improve production efficiency;High yield, low scrap rate, greatly reduce production cost;Simple structure, greatly reduce manufacturing cost.

Description

Technical Field

[0001] This utility model relates to the field of parts processing equipment technology, and in particular to a milling machine clamping and fixing device and a keyway processing system. Background Technology

[0002] In the field of mechanical manufacturing, shafts are core components in various transmission mechanisms and rotating equipment. Their surfaces often require keyways to achieve circumferential fixation with parts such as gears and pulleys, ensuring the stability and accuracy of power transmission. The machining quality of the keyways directly affects the assembly accuracy of the shaft system and the operating performance of the equipment; therefore, strict requirements are placed on the dimensional accuracy, positional accuracy, and surface quality of the keyways.

[0003] Currently, the industry commonly uses milling machines to machine keyways on the surface of shaft workpieces. The conventional operating procedure is as follows: the operator places the shaft workpiece on the milling machine table, clamps it in a bench vise, adjusts the milling cutter position and machining parameters, and then starts the milling machine to complete the keyway milling. However, this traditional machining method, which relies on a bench vise to clamp the workpiece, has several significant drawbacks:

[0004] First, bench vises leave noticeable clamping marks on the workpiece surface, damaging it. Bench vises clamp workpieces using the mechanical force of their jaws. To prevent loosening during machining, operators often need to apply significant clamping force. Since shaft workpieces typically undergo precision machining (such as turning and grinding) and have high surface roughness requirements, while bench vises' jaws are mostly made of metal with relatively rough surfaces, the contact area between the jaws and the workpiece surface under strong clamping force will experience extrusion deformation, forming clamping marks of varying depths. These marks not only damage the integrity and aesthetics of the workpiece surface but can also become stress concentration points, leading to fatigue cracks during subsequent use and reducing the workpiece's mechanical properties and service life. For high-precision shaft parts, this type of damage often results in the workpiece being scrapped, significantly increasing production costs.

[0005] Secondly, during the milling process, the inability to accurately position the keyway leads to a lack of symmetry between the keyway and the workpiece's axis centerline. The symmetry between the keyway and the axis centerline is a key indicator for ensuring the assembly accuracy of the shaft system. Typically, the deviation of the two sides of the keyway relative to the axis centerline must be controlled within a very small range (e.g., within 0.05mm). When using a bench vise, workpiece positioning relies primarily on the operator's visual observation and experience, manually prying or tapping the workpiece to make the axis centerline approximately parallel or perpendicular to the milling machine's worktable. This positioning method lacks a quantifiable benchmark and a precise adjustment mechanism, making it difficult to achieve accurate calibration of the axis centerline. During milling, the keyway's machining position uses the bench vise or worktable as an indirect benchmark. Factors such as workpiece placement angle deviations and bench vise installation errors can easily cause the keyway centerline to shift from the workpiece's own axis centerline, failing to meet symmetry requirements. Such deviations result in uneven clearance between the key and keyway during assembly, leading to abnormal noises and increased vibration in the shaft system, severely affecting the equipment's transmission accuracy.

[0006] Secondly, during the milling process, the workpiece is prone to axial displacement and rotation. When milling keyways, the contact between the milling cutter and the workpiece surface generates a continuous cutting force, which acts on the workpiece axially and radially. Since the bench vise clamps the workpiece mainly through radial constraint, its axial limiting ability is weak, and there is a certain distance between the clamping point and the cutting point, creating a lever arm effect. When the cutting force exceeds the friction of the bench vise, the workpiece will experience a slight axial slippage (axial displacement). At the same time, if there is a roundness error on the outer surface of the workpiece or uneven clamping force on both sides of the bench vise, the radial component of the cutting force will cause the workpiece to have a tendency to rotate around its own axis, resulting in deflection (rotation) of the workpiece during machining. The axial displacement and rotation of the workpiece will directly cause keyway dimensional deviations (such as inconsistent length and depth), shape deformation (such as keyway misalignment), and may even lead to abnormal contact between the milling cutter and the workpiece, causing safety accidents such as tool damage or workpiece scrap.

[0007] In summary, the traditional method of using a bench vise to clamp shaft workpieces for keyway milling is no longer sufficient to meet the requirements of modern mechanical manufacturing for keyway machining accuracy, workpiece surface quality, and production safety. Therefore, there is an urgent need for a positioning and clamping device for shaft workpiece keyway machining that can overcome the above-mentioned defects, so as to improve machining quality and production efficiency and meet the development needs of precision manufacturing.

[0008] Currently, no effective solutions have been proposed for the problems existing in related technologies, such as clamping marks on the workpiece surface, easy rotation of the workpiece under force and axial displacement, and low positioning accuracy leading to the asymmetry between the keyway and the shaft centerline. Utility Model Content

[0009] The purpose of this utility model is to address the shortcomings of the existing technology by providing a milling machine clamping and fixing device and a keyway machining system, so as to solve the problems in the related technology, such as clamping marks on the workpiece surface caused by existing clamping tools, easy rotation of the workpiece under force and axial displacement, and low positioning accuracy causing the keyway and shaft centerline to be asymmetrical.

[0010] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0011] In a first aspect, a milling machine clamping and fixing device is provided for clamping and fixing a workpiece to be milled with a keyway, comprising:

[0012] A base unit for mounting on a milling machine;

[0013] A positioning unit is disposed on the upper end face of the base unit and is used to position the end of the workpiece;

[0014] A clamping unit is disposed on the upper end face of the base unit and located on the side of the positioning unit, for clamping the bottom surface of the workpiece;

[0015] A locking unit is disposed on the upper end face of the base unit and located on the side of the clamping unit, for locking the side end face of the workpiece;

[0016] An eccentric clamping unit is disposed on the upper end face of the base unit and located between the clamping unit and the locking unit, and is used to clamp the workpiece.

[0017] In some embodiments, the base unit includes:

[0018] Base element for mounting on a milling machine;

[0019] A first mounting element is disposed on the upper end surface of the base element and is detachably connected to the positioning unit.

[0020] The second mounting element is disposed on the upper end surface of the base element and located on the side of the first mounting element, and is detachably connected to the clamping unit.

[0021] The third mounting element is disposed on the upper end surface of the base element and located on the side of the second mounting element, and is detachably connected to the locking unit;

[0022] A fourth mounting element is disposed on the upper end face of the base element and located between the second mounting element and the third mounting element, and is detachably connected to the eccentric clamping unit.

[0023] In some embodiments, the positioning unit includes:

[0024] The fifth mounting element is disposed on the upper end face of the base unit and located on the side of the clamping unit, and is detachably connected to the base unit.

[0025] The first positioning element is disposed on the upper end face of the fifth mounting element and is used to position the end of the workpiece.

[0026] In some embodiments, the positioning unit further includes:

[0027] The second positioning element is disposed on the side end face of the first positioning element;

[0028] The third positioning element has a first end that is detachably connected to the second positioning element, and a second end that protrudes from the side end face of the first positioning element for positioning the end of the workpiece.

[0029] In some embodiments, the clamping unit includes:

[0030] The sixth mounting element is disposed on the upper end face of the base unit and located between the positioning unit, the locking unit and the eccentric clamping unit, and is detachably connected to the base unit.

[0031] A first clamping element is disposed on the upper end face of the sixth mounting element and is used to abut against one side of the bottom surface of the workpiece.

[0032] The second clamping element is disposed on the upper end face of the sixth mounting element and is symmetrically arranged with the first clamping element. It is used to abut against the other side of the workpiece to cooperate with the first clamping element to abut against the bottom end face of the workpiece.

[0033] In some embodiments, the locking unit includes:

[0034] A seventh mounting element is disposed on the upper end face of the base unit and located between the locking unit and the eccentric clamping unit, and is detachably connected to the base unit.

[0035] A first guide element is disposed on the upper end face of the seventh mounting element;

[0036] A first locking element is movably disposed on the first guide element for locking the side end face of the workpiece.

[0037] In some embodiments, the locking unit further includes:

[0038] A second locking element is disposed at the end of the first guide element;

[0039] A third locking element is disposed at the end of the first locking element;

[0040] A fourth locking element is removably locked to the second locking element and the third locking element, respectively, for locking the relative position of the first locking element and the first guide element.

[0041] In some embodiments, the eccentric clamping unit includes:

[0042] The eighth mounting element is disposed on the upper end face of the base unit and located between the clamping unit and the locking unit, and is detachably connected to the base unit;

[0043] A first rotating element is disposed on the upper end face of the eighth mounting element;

[0044] An eccentric element, which is rotatably disposed on the first rotating element;

[0045] The second rotating element is eccentrically disposed from the eccentric element and rotatably connected to the eccentric element;

[0046] A clamping element, which is connected to the second rotating element, is used to be in a clamping position to clamp the side end face of the workpiece or in a release position to release the workpiece under the action of the second rotating element.

[0047] The second guide element is disposed on the upper end surface of the base unit and is detachably connected to the base unit;

[0048] The third guide element is connected to the clamping element and is movably connected to the second guide element, and is used to reciprocate along the second guide element under the action of the clamping element.

[0049] In some embodiments, the eccentric clamping unit further includes:

[0050] An elastic element is disposed between the second guide element and the third guide element to provide elastic force.

[0051] In some embodiments, the eccentric clamping unit further includes:

[0052] A handle element, which is connected to the eccentric element, is used to drive the eccentric element to rotate.

[0053] Secondly, a keyway machining system is provided, comprising:

[0054] The milling machine clamping and fixing device as described in the first aspect;

[0055] A milling machine, wherein the milling machine is provided with a milling machine clamping and fixing device.

[0056] The present invention adopts the above technical solution and has the following technical effects compared with the prior art:

[0057] This utility model discloses a milling machine clamping and fixing device and a keyway machining system. It utilizes a locking unit that engages with the surface hole of the workpiece to prevent workpiece rotation and axial displacement. A V-shaped clamping unit, in conjunction with an eccentric clamping unit, clamps the workpiece. The eccentric wheel principle ensures appropriate clamping force, preventing indentations on the workpiece surface. Workpiece assembly and disassembly are flexible and convenient, saving operation time and costs. It facilitates milling batches of workpieces, improving production efficiency. It boasts a high yield rate and low scrap rate, significantly reducing production costs. Its simple structure greatly reduces manufacturing costs. Attached Figure Description

[0058] Figure 1 This is a schematic diagram of a milling machine clamping and fixing device according to an embodiment of the present utility model;

[0059] Figure 2 This is a schematic diagram of the base unit according to an embodiment of the present utility model;

[0060] Figure 3 This is a schematic diagram (a) of the positioning unit according to an embodiment of the present utility model;

[0061] Figure 4 This is a schematic diagram (II) of the positioning unit according to an embodiment of the present utility model;

[0062] Figure 5 This is a schematic diagram of the clamping unit according to an embodiment of the present utility model;

[0063] Figure 6 This is a schematic diagram (a) of the locking unit according to an embodiment of the present utility model;

[0064] Figure 7 This is a schematic diagram (II) of the locking unit according to an embodiment of the present utility model;

[0065] Figure 8 This is a schematic diagram (a) of the eccentric clamping unit according to an embodiment of the present utility model;

[0066] Figure 9This is a schematic diagram (II) of the eccentric clamping unit according to an embodiment of the present utility model;

[0067] Figure 10 This is a schematic diagram of the milling machine clamping and fixing device in use according to an embodiment of the present utility model;

[0068] Figure 11 This is a schematic diagram of a keyway machining system according to an embodiment of the present utility model.

[0069] The attached figures are labeled as follows: 100, milling machine clamping and fixing device;

[0070] 110. Base unit; 111. Base element; 112. First mounting element; 113. Second mounting element; 114. Third mounting element; 115. Fourth mounting element;

[0071] 120. Positioning unit; 121. Fifth mounting element; 122. First positioning element; 123. Second positioning element; 124. Third positioning element;

[0072] 130. Clamping unit; 131. Sixth mounting element; 132. First clamping element; 133. Second clamping element;

[0073] 140. Locking unit; 141. Seventh mounting element; 142. First guide element; 143. First locking element; 144. Second locking element; 145. Third locking element;

[0074] 150. Eccentric clamping unit; 151. Eighth mounting element; 152. First rotating element; 153. Eccentric element; 154. Second rotating element; 155. Clamping element; 156. Second guide element; 157. Third guide element; 158. Elastic element; 159. Handle element;

[0075] 200. Milling machine. Detailed Implementation

[0076] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0077] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0078] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0079] Example 1

[0080] This embodiment relates to a milling machine clamping and fixing device of the present invention.

[0081] An illustrative embodiment of this utility model, such as Figure 1 As shown, a milling machine clamping and fixing device 100 is used to clamp and fix a workpiece to be milled for a keyway. It includes a base unit 110, a positioning unit 120, a clamping unit 130, a locking unit 140, and an eccentric clamping unit 150. The base unit 110 is mounted on the milling machine; the positioning unit 120 is located on the upper surface of the base unit 110 and is used to position the end of the workpiece; the clamping unit 130 is located on the upper surface of the base unit 110 and is situated to the side of the positioning unit 120, used to clamp the bottom surface of the workpiece; the locking unit 140 is located on the upper surface of the base unit 110 and is situated to the side of the clamping unit 130, used to lock the side end face of the workpiece; and the eccentric clamping unit 150 is located on the upper surface of the base unit 110 and is situated between the clamping unit 130 and the locking unit 140, used to clamp the workpiece.

[0082] In this invention, the workpiece includes, but is not limited to, a short-shaft workpiece.

[0083] The method of using this utility model is as follows:

[0084] Place the workpiece in the clamping unit 130, so that the first end of the workpiece abuts against the positioning unit 120;

[0085] Operate the locking unit 140 to connect the locking unit 140 with the surface hole at the second end of the workpiece, thereby limiting the second end of the workpiece and preventing the workpiece from moving or rotating axially.

[0086] Operate the eccentric clamping unit 150 to make the eccentric clamping unit 150 abut against the side end face of the workpiece;

[0087] Perform keyway milling on the workpiece;

[0088] After completing the keyway milling process, reverse the operation to remove the workpiece.

[0089] like Figure 2As shown, the base unit 110 includes a base element 111, a first mounting element 112, a second mounting element 113, a third mounting element 114, and a fourth mounting element 115. The base element 111 is mounted on a milling machine; the first mounting element 112 is disposed on the upper end face of the base element 111 and is detachably connected to the positioning unit 120; the second mounting element 113 is disposed on the upper end face of the base element 111 and located to the side of the first mounting element 112, and is detachably connected to the clamping unit 130; the third mounting element 114 is disposed on the upper end face of the base element 111 and located to the side of the second mounting element 113, and is detachably connected to the locking unit 140; the fourth mounting element 115 is disposed on the upper end face of the base element 111 and located between the second mounting element 113 and the third mounting element 114, and is detachably connected to the eccentric clamping unit 150.

[0090] The base element 111 is detachably mounted on the milling machine. Specifically, the base element 111 can be mounted on the milling machine using fasteners. These fasteners include, but are not limited to, bolts. For example, connecting holes (which can be smooth holes or threaded holes) or connecting grooves are provided on both symmetrical sides of the base element 111. The fasteners are sequentially connected to the connecting holes and then to the milling machine, thereby fixing the base element 111 to the milling machine. Alternatively, the fasteners pass through the connecting grooves, connect to the milling machine, and abut against the base element 111, thereby fixing the base element 111 to the milling machine.

[0091] In some of these embodiments, the base element 111 includes, but is not limited to, a base.

[0092] The first mounting element 112 is formed on the upper end surface of the base element 111. Generally, the first mounting element 112 and the base element 111 are integrally formed.

[0093] Furthermore, the first mounting element 112 and the positioning unit 120 can be connected by fasteners. For example, the first mounting element 112 is provided with multiple connection holes. Fasteners are sequentially connected to the positioning unit 120 and the connection holes, thereby fixing the positioning unit 120 to the base element 111.

[0094] In some of these embodiments, the first mounting element 112 includes, but is not limited to, a mounting base, a mounting groove, etc.

[0095] The second mounting element 113 is formed on the upper end surface of the base element 111. Generally, the second mounting element 113 is integrally formed with the base element 111.

[0096] Furthermore, the second mounting element 113 and the clamping unit 130 can be connected by fasteners. For example, the second mounting element 113 is provided with multiple connection holes. Fasteners are connected to the connection holes and the clamping unit 130 in sequence, thereby fixing the clamping unit 130 to the base element 111.

[0097] In some of these embodiments, the second mounting element 113 includes, but is not limited to, a mounting base, a mounting groove, etc.

[0098] The third mounting element 114 is formed on the upper end surface of the base element 111. Generally, the third mounting element 114 is integrally formed with the base element 111.

[0099] Furthermore, the third mounting element 114 and the locking unit 140 can be connected by fasteners. For example, the third mounting element 114 is provided with multiple connection holes. Fasteners are connected to the locking unit 140 and the connection holes in sequence, thereby fixing the locking unit 140 to the base element 111.

[0100] In some of these embodiments, the third mounting element 114 includes, but is not limited to, a mounting base, a mounting groove, etc.

[0101] The fourth mounting element 115 is formed on the upper end surface of the base element 111. Generally, the fourth mounting element 115 is integrally formed with the base element 111.

[0102] Furthermore, the fourth mounting element 115 and the eccentric clamping unit 150 can be connected by fasteners. For example, the fourth mounting element 115 is provided with multiple connection holes. Fasteners are sequentially connected to the eccentric clamping unit 150 and the connection holes, thereby fixing the eccentric clamping unit 150 to the base element 111.

[0103] In some of these embodiments, the fourth mounting element 115 includes, but is not limited to, a mounting base, a mounting groove, etc.

[0104] like Figures 3-4 As shown, the positioning unit 120 includes a fifth mounting element 121 and a first positioning element 122. The fifth mounting element 121 is disposed on the upper end face of the base unit 110 and located on the side of the clamping unit 130, and is detachably connected to the base unit 110; the first positioning element 122 is disposed on the upper end face of the fifth mounting element 121 and is used to position the end of the workpiece.

[0105] Specifically, the fifth mounting element 121 is removably disposed on the first mounting element 112.

[0106] The fifth mounting element 121 and the first mounting element 112 are generally connected by fasteners. For example, the fifth mounting element 121 is provided with multiple connection holes. Fasteners are sequentially connected to the connection holes of the fifth mounting element 121 and the connection holes of the first mounting element 112, thereby mounting the fifth mounting element 121 onto the first mounting element 112.

[0107] In some of these embodiments, the fifth mounting element 121 includes, but is not limited to, a mounting base, a mounting plate, etc.

[0108] The first positioning element 122 is formed on the upper end surface of the fifth mounting element 121. Generally, the first positioning element 122 and the fifth mounting element 121 are integrally formed.

[0109] Generally, the first positioning element 122 is disposed perpendicular to the fifth mounting element 121. That is, the first positioning element 122 and the fifth mounting element 121 form a convex structure or an L-shaped structure.

[0110] In some of these embodiments, the first positioning element 122 includes, but is not limited to, a positioning baffle.

[0111] Furthermore, the positioning unit 120 also includes a second positioning element 123 and a third positioning element 124. The second positioning element 123 is disposed on the side end face of the first positioning element 122; the first end of the third positioning element 124 is detachably connected to the second positioning element 123, and the second end of the third positioning element 124 protrudes from the side end face of the first positioning element 122 for positioning the end of the workpiece.

[0112] The second positioning element 123 is formed on the side end face of the first positioning element 122. Generally, the second positioning element 123 and the first positioning element 122 are integrally formed.

[0113] Generally, the axial direction of the second positioning element 123 is parallel to that of the fifth mounting element 121.

[0114] In some embodiments, there are multiple second positioning elements 123. These multiple second positioning elements 123 are spaced apart along the height direction of the first positioning element 122, thereby meeting the requirements of workpieces of different specifications.

[0115] In some of these embodiments, the second positioning element 123 includes, but is not limited to, a positioning groove.

[0116] The third positioning element 124 is detachably connected to the second positioning element 123, for example, by a threaded connection. For example, the third positioning element 124 can be screwed into the second positioning element 123 and tightened to fix the third positioning element 124 to the second positioning element 123.

[0117] In some embodiments, the third positioning element 124 is T-shaped. Specifically, the radial dimension (e.g., diameter) of the second end of the third positioning element 124 is larger than the radial dimension (e.g., diameter) of the first end of the third positioning element 124, and the axial dimension (e.g., thickness) of the second end of the third positioning element 124 is smaller than the axial dimension (e.g., length) of the first end of the third positioning element 124. This shape design allows for a larger contact area between the second end of the third positioning element 124 and the end of the workpiece.

[0118] In some of these embodiments, the third positioning element 124 includes, but is not limited to, a support rod, a support pin, etc.

[0119] like Figure 5 As shown, the clamping unit 130 includes a sixth mounting element 131, a first clamping element 132, and a second clamping element 133. The sixth mounting element 131 is disposed on the upper end face of the base unit 110, located between the positioning unit 120, the locking unit 140, and the eccentric clamping unit 150, and is detachably connected to the base unit 110. The first clamping element 132 is disposed on the upper end face of the sixth mounting element 131 and is used to abut one side of the bottom surface of the workpiece. The second clamping element 133 is disposed on the upper end face of the sixth mounting element 131 and is symmetrically arranged with the first clamping element 132, used to abut the other side of the workpiece to cooperate with the first clamping element 132 in abutting the bottom end face of the workpiece.

[0120] Specifically, the sixth mounting element 131 is removably disposed on the second mounting element 113.

[0121] The sixth mounting element 131 and the second mounting element 113 are generally connected by fasteners. For example, the sixth mounting element 131 is provided with multiple connection holes. Fasteners are connected sequentially to the connection holes of the second mounting element 113 and the connection holes of the sixth mounting element 131, thereby mounting the sixth mounting element 131 onto the second mounting element 113.

[0122] Furthermore, when the second mounting element 113 is a mounting slot, the sixth mounting element 131 is first inserted into the second mounting element 113, and then fastened by fasteners.

[0123] In some embodiments, the sixth mounting element 131 includes, but is not limited to, a mounting base, a mounting plate, etc.

[0124] The first clamping element 132 is formed at the first end of the upper end face of the sixth mounting element 131. Generally, the first clamping element 132 and the sixth mounting element 131 are integrally formed.

[0125] Generally, the cross-section of the first clamping element 132 is triangular or trapezoidal. For example, the first clamping element 132 includes a first plane, a first vertical plane, a first inclined plane, and a second vertical plane. The first plane is formed at the top of the first clamping element 132 and is parallel to the upper end face of the sixth mounting element 131; the first vertical plane is formed at the end of the first clamping element 132 away from the second clamping element 133 and is coplanar with the side end face of the first clamping element 132; the first inclined plane is formed at the end of the first clamping element 132 near the second clamping element 133; the second vertical plane is formed at the end of the first clamping element 132 near the second clamping element 133, and is located below the first inclined plane and is perpendicular to the upper end face of the first clamping element 132.

[0126] Generally, the distance between the top of the first vertical plane and the top of the first inclined plane is less than the distance between the bottom of the first vertical plane and the bottom of the second vertical plane.

[0127] In some of these embodiments, the first clamping element 132 includes, but is not limited to, a clamping base, a clamping baffle, etc.

[0128] The second clamping element 133 is formed at the second end of the upper end face of the sixth mounting element 131. Generally, the second clamping element 133 and the sixth mounting element 131 are integrally formed.

[0129] Generally, the cross-section of the second clamping element 133 is triangular or trapezoidal. For example, the second clamping element 133 includes a second plane, a third vertical plane, a second inclined plane, and a fourth vertical plane. The second plane is formed at the top of the second clamping element 133 and is parallel to the upper end face of the sixth mounting element 131; the third vertical plane is formed at the end of the second clamping element 133 away from the first clamping element 132 and is coplanar with the side end face of the second clamping element 133; the second inclined plane is formed at the end of the second clamping element 133 near the first clamping element 132; and the fourth vertical plane is formed at the end of the second clamping element 133 near the first clamping element 132, located below the second inclined plane, and is perpendicular to the upper end face of the second clamping element 133.

[0130] Generally, the distance between the top of the third vertical plane and the top of the second inclined plane is less than the distance between the bottom of the third vertical plane and the bottom of the fourth vertical plane.

[0131] Generally, the inclination of the second inclined plane is the same as that of the first inclined plane.

[0132] Generally, the first inclined plane, the second vertical plane, the second inclined plane, and the fourth vertical plane form a funnel-shaped structure. This funnel-shaped structure can accommodate workpieces of different diameters and allows the bottom of the workpiece to be suspended in the air (i.e., the bottom of the workpiece does not contact the upper surface of the sixth mounting element 131).

[0133] In some embodiments, the second clamping element 133 includes, but is not limited to, a clamping base, a clamping baffle, etc.

[0134] Furthermore, the clamping unit 130 also includes a first buffer element. The first buffer element covers at least the first clamping element 132 and the second clamping element 133.

[0135] In some of these embodiments, the first buffer element is bonded to the first clamping element 132 and the second clamping element 133.

[0136] In some of these embodiments, the first buffer element is fitted with the first clamping element 132 and the second clamping element 133.

[0137] In some of these embodiments, the first cushioning element includes, but is not limited to, a cushioning pad or a cushioning sleeve.

[0138] In some of these embodiments, the surface of the first buffer element is an uneven surface to increase friction.

[0139] like Figures 6-7 As shown, the locking unit 140 includes a seventh mounting element 141, a first guide element 142, and a first locking element 143. The seventh mounting element 141 is disposed on the upper end face of the base unit 110 and located between the locking unit 140 and the eccentric clamping unit 150, and is detachably connected to the base unit 110. The first guide element 142 is disposed on the upper end face of the seventh mounting element 141. The first locking element 143 is movably disposed on the first guide element 142 and is used to lock the side end face of the workpiece.

[0140] Specifically, the seventh mounting element 141 is removably disposed on the third mounting element 114.

[0141] The seventh mounting element 141 and the third mounting element 114 are generally connected by fasteners. For example, the seventh mounting element 141 is provided with multiple connection holes. Fasteners are connected to the connection holes of the seventh mounting element 141 and the connection holes of the third mounting element 114 in sequence, thereby mounting the seventh mounting element 141 onto the third mounting element 114.

[0142] In some of these embodiments, the seventh mounting element 141 includes, but is not limited to, a mounting base, a mounting pedestal, etc.

[0143] The first guide element 142 is formed on the upper end face of the seventh mounting element 141.

[0144] The first guide element 142 can be arranged parallel to the horizontal plane or at an angle. For example, the position of the end of the first guide element 142 away from the workpiece is higher than the position of the end of the first guide element 142 closer to the workpiece.

[0145] In some embodiments, the first guide element 142 includes, but is not limited to, a guide cylinder, a guide groove, etc. Furthermore, the inner edge surface of the first guide element 142 can be a smooth surface or it can be threaded.

[0146] In some of these embodiments, the first guide element 142 and the seventh mounting element 141 form a pin holder.

[0147] The movable connection between the first locking element 143 and the first guide element 142 includes, but is not limited to, sliding connection, threaded connection, etc., so that the first locking element 143 can move forward or backward along the axial direction of the first guide element 142.

[0148] In some embodiments, the first locking element 143 includes a rod, a locking part, and an operating part. The rod is movably connected to the first guide element 142; the locking part is located at the proximal end of the rod (closer to the workpiece) and is used to follow the axial movement of the rod along the first guide element 142 to connect with or separate from a surface hole in the workpiece; the operating part is located at the distal end of the rod (away from the workpiece) and is used to drive the rod to move axially along the first guide element 142 under the action of a user.

[0149] In some embodiments, the outer edge of the rod may be a smooth surface or it may be threaded (i.e. threaded to the first guide element 142 which is threaded).

[0150] Generally, the radial dimension (e.g., diameter) of the locking part is smaller than the radial dimension (e.g., diameter) of the rod part, and the axial dimension (e.g., length) of the locking part is smaller than the axial dimension (e.g., length) of the rod part.

[0151] In some embodiments, the locking portion has a convex cross-section. That is, the radial dimension (e.g., diameter) of the proximal end of the locking portion is smaller than the radial dimension (e.g., diameter) of the distal end of the locking portion, thereby accommodating surface holes of different shapes and sizes.

[0152] Generally, the radial dimension (e.g., diameter) of the operating part is larger than the radial dimension (e.g., diameter) of the lever part, and the axial dimension (e.g., length) of the locking part is smaller than the axial dimension (e.g., length) of the lever part. This design is adopted to facilitate the operation of the lever part and for limiting movement.

[0153] In some embodiments, the cross-section of the operating part is convex. That is, the radial dimension (e.g., diameter) of the proximal end of the operating part is smaller than the radial dimension (e.g., diameter) of the distal end of the operating part.

[0154] In some of these embodiments, the first locking element 143 includes, but is not limited to, a latch.

[0155] Furthermore, the locking unit 140 also includes a second locking element 144, a third locking element 145, and a fourth locking element 146. The second locking element 144 is disposed at the end of the first guide element 142; the third locking element 145 is disposed at the end of the first locking element 143; and the fourth locking element 146 is removably locked to the second locking element 144 and the third locking element 145, respectively, for locking the relative position of the first locking element 143 and the first guide element 142.

[0156] The second locking element 144 is formed at the distal end of the first guide element 142. Generally, the second locking element 144 and the first guide element 142 are integrally formed.

[0157] The second locking element 144 is disposed through the inner wall and the outer wall of the first guide element 142, thereby enabling the interior of the first guide element 142 to communicate with the outside through the second locking element 144.

[0158] In addition, the second locking element 144 may also be disposed through the end of the first guide element 142.

[0159] In some of these embodiments, the second locking element 144 includes, but is not limited to, a locking groove.

[0160] The third locking element 145 is formed at the distal end of the first locking element 143. Generally, the third locking element 145 is integrally formed with the first locking element 143.

[0161] In some of these embodiments, a third locking element 145 is formed near the operating portion of the first locking element 143.

[0162] In some of these embodiments, the third locking element 145 includes, but is not limited to, a locking groove.

[0163] The fourth locking element 146 is connected to the second locking element 144 and the third locking element 145 respectively.

[0164] In some embodiments, the fourth locking element 146 includes a first insertion portion and a second insertion portion. The first insertion portion is inserted into the second locking element 144; the second insertion portion is formed at the lower end of the first insertion portion and is inserted into the third locking element 145.

[0165] Generally, the second connector and the first connector form an L-shaped structure. That is, the length of the second connector is less than the length of the first connector.

[0166] In some of these embodiments, the fourth locking element 146 includes, but is not limited to, a clamping block.

[0167] like Figures 8-9 As shown, the eccentric clamping unit 150 includes an eighth mounting element 151, a first rotating element 152, an eccentric element 153, a second rotating element 154, a clamping element 155, a second guiding element 156, and a third guiding element 157. The eighth mounting element 151 is disposed on the upper end face of the base unit 110 and located between the clamping unit 130 and the locking unit 140, and is detachably connected to the base unit 110; the first rotating element 152 is disposed on the upper end face of the eighth mounting element 151; the eccentric element 153 is rotatably disposed on the first rotating element 152; the second rotating element 154 is eccentrically disposed on the eccentric element 153 and is rotatably connected to the eccentric element 153; the clamping element 155 is connected to the second rotating element 154 and is used to be in a clamping position to clamp the side end face of the workpiece or in a release position to release the workpiece under the action of the second rotating element 154; the second guiding element 156 is disposed on the upper end face of the base unit 110 and is detachably connected to the base unit 110; the third guiding element 157 is connected to the clamping element 155 and is movably connected to the second guiding element 156, and is used to reciprocate along the second guiding element 156 under the action of the clamping element 155.

[0168] Specifically, the eighth mounting element 151 is removably disposed on the fourth mounting element 115; the second guide element 156 is detachably connected to the base element 111.

[0169] The eighth mounting element 151 and the fourth mounting element 115 are generally connected by fasteners. For example, the eighth mounting element 151 is provided with multiple connection holes. Fasteners are connected sequentially to the connection holes of the eighth mounting element 151 and the connection holes of the fourth mounting element 115, thereby mounting the eighth mounting element 151 onto the fourth mounting element 115.

[0170] In some embodiments, the eighth mounting element 151 includes, but is not limited to, a mounting base, a mounting pedestal, etc.

[0171] The first rotating element 152 is formed on the upper end face of the eighth mounting element 151. For example, the first rotating element 152 is integrally formed with the eighth mounting element 151, or the first rotating element 152 is inserted into the eighth mounting element 151.

[0172] In some embodiments, the first rotating element 152 includes a rotating base and a rotating groove. The rotating base is disposed on the upper end face of the eighth mounting element 151; the rotating groove is formed on the upper end face of the rotating base and is rotatably connected to the eccentric element 153 for allowing the eccentric element 153 to rotate.

[0173] Generally, the rotating groove is formed in the middle of the rotating base.

[0174] Generally, the rotating groove is an arc-shaped groove. Preferably, the central angle of the rotating groove is less than 180°.

[0175] In some embodiments, the eccentric element 153 includes an eccentric rotating wheel and a rotating hole. The eccentric rotating wheel is rotatably disposed in the rotating groove of the first rotating element 152; the rotating hole is disposed through the left and right end faces of the eccentric rotating wheel, is not coaxial with the eccentric rotating wheel, and is movably connected to the second rotating element 154.

[0176] The two ends of the second rotating element 154 protrude from the left and right end faces of the eccentric rotating wheel of the eccentric element 153.

[0177] Generally, the radial dimension (e.g., diameter) of the second rotating element 154 is not greater than the radial dimension (e.g., diameter) of the rotating hole of the eccentric element 153. For example, the diameter of the second rotating element 154 is smaller than the diameter of the rotating hole.

[0178] In some of these embodiments, the second rotating element 154 includes, but is not limited to, a rotating rod, a rotating shaft, etc.

[0179] In some embodiments, the clamping element 155 includes a first extension, a second extension, and a pressing portion. The distal end of the first extension is connected to the first end of the second rotating element 154, and the middle portion of the first extension abuts against the third guide element 157. The distal end of the second extension is connected to the second end of the second rotating element 154, and the middle portion of the second extension abuts against the third guide element 157. The two ends of the pressing portion are respectively connected to the proximal ends of the first and second extensions, and the bottom end of the pressing portion protrudes beyond the bottom ends of the first and second extensions.

[0180] Generally, the first extension, the second extension, and the clamping part form a U-shaped structure.

[0181] In some embodiments, the clamping element 155, the second rotating element 154, and the eccentric element 153 may be installed as follows: the eccentric element 153 is sleeved on the distal end of the clamping element 155 (i.e., the distal end of the first extension is located on one side of the eccentric rotating wheel, and the distal end of the second extension is located on the other side of the eccentric rotating wheel), the first end of the second rotating element 154 passes through the first extension, the rotating hole, and the second extension in sequence and is connected to the second extension (e.g., by fastening with a nut, or by threading the first end of the second rotating element 154 to the second extension), and the second end of the second rotating element 154 is connected to the first extension (e.g., by fastening with a nut, or by threading the second end of the second rotating element 154 to the first extension).

[0182] In some of these embodiments, the clamping element 155 includes, but is not limited to, a pressure plate.

[0183] The second guide element 156 is typically threaded to the base element 111. For example, the bottom end of the second guide element 156 is threaded to the base element 111.

[0184] In some of these embodiments, the second guide element 156 includes, but is not limited to, a bolt.

[0185] In addition, the second guide element 156 can be reinforced by a nut provided on the base element 111.

[0186] In some embodiments, the third guide element 157 includes a limiting frame and two guide holes. The limiting frame is fitted with a clamping element 155 (i.e., one inner wall, upper inner wall, and lower inner wall of the limiting frame abut against the first extension, and the other inner wall, upper inner wall, and lower inner wall of the limiting frame abut against the second extension). One guide hole penetrates the upper end of the limiting frame and is slidably connected to the second guide element 156, and the other guide hole penetrates the lower end of the limiting frame and is slidably connected to the second guide element 156.

[0187] In some of these embodiments, the third guide element 157 includes, but is not limited to, a guide sleeve.

[0188] Furthermore, the eccentric clamping unit 150 also includes an elastic element 158. The elastic element 158 ​​is disposed between the second guide element 156 and the third guide element 157 to provide elastic force.

[0189] Generally, the elastic element 158 ​​is fitted with the second guide element 156.

[0190] In some embodiments, the bottom end of the elastic element 158 ​​abuts against the base element 111 (or against a nut located on the upper end of the base element 111), and the top end of the elastic element 158 ​​abuts against the bottom end of the third guide element 157 (the bottom end of the limiting frame).

[0191] In some embodiments, the top end of the elastic element 158 ​​is fixedly connected to the third guide element 157, for example, by welding.

[0192] In some of these embodiments, the elastic element 158 ​​includes, but is not limited to, a compression spring.

[0193] Furthermore, the eccentric clamping unit 150 also includes a handle element 159. The handle element 159 is connected to the eccentric element 153 and is used to drive the eccentric element 153 to rotate.

[0194] The handle element 159 is located on the side of the eccentric element 153 away from the second guide element 156. For example, the handle element 159 is integrally formed with the eccentric element 153, or the handle element 159 is plugged into the eccentric element 153 and then fastened by fasteners.

[0195] In some of these embodiments, the handle element 159 includes, but is not limited to, a handle.

[0196] Furthermore, the eccentric clamping unit 150 also includes a second buffer element. The second buffer element covers the clamping element 155.

[0197] Specifically, the second buffer element covers the clamping part.

[0198] In some of these embodiments, the second buffer element is bonded to the clamping element 155.

[0199] In some of these embodiments, the second buffer element is fitted with the clamping element 155.

[0200] In some of these embodiments, the second cushioning element includes, but is not limited to, a cushioning pad or a cushioning sleeve.

[0201] In some embodiments, the surface of the second buffer element is an uneven surface to increase friction.

[0202] like Figure 10 As shown, the method of using this utility model is as follows:

[0203] The workpiece to be milled is gently placed on the first clamping element 132 and the second clamping element 133, so that the two sides of the bottom end of the workpiece abut against the first clamping element 132 and the second clamping element 133 respectively.

[0204] One end of the workpiece abuts against the third positioning element 124 (or, if the third positioning element 124 is not provided, abuts against the first positioning element 122);

[0205] Rotate the first locking element 143 so that the first locking element 143 moves forward and downward along the first guide element 142;

[0206] At the same time, rotate the workpiece so that the surface hole of the workpiece corresponds to the first locking element 143, and continue to rotate the first locking element 143 so that the first locking element 143 is in contact with the surface hole;

[0207] Press down the handle element 159 so that it passes through the eccentric element 153, the second rotating element 154, and the third guide element 157 and the second guide element 156 to drive the clamping element 155 to clamp the workpiece. The elastic element 158 ​​is used to make the clamping element 155 abut against the workpiece.

[0208] The workpiece is milled to create a keyway (such as a semi-circular keyway);

[0209] After the milling process is completed, the reverse operation is performed to remove the machined workpiece;

[0210] Repeat the above steps until the milling of all workpieces is completed.

[0211] The technical effects of this utility model are as follows:

[0212] 1) The locking unit engages with the surface hole of the workpiece to prevent the workpiece from rotating and displacing along the axial direction;

[0213] 2) The V-shaped clamping unit and the eccentric clamping unit are used to clamp the workpiece. The eccentric wheel principle is used to make the clamping force moderate and not to form indentations on the surface of the workpiece.

[0214] 3) The assembly and disassembly of workpieces are flexible and convenient, saving operation time and costs;

[0215] 4) Facilitates milling of batches of workpieces, improving production efficiency;

[0216] 5) High yield and low scrap rate, greatly reducing production costs;

[0217] 6) The structure is simple, which greatly reduces manufacturing costs.

[0218] Example 2

[0219] This embodiment relates to the keyway machining system of this utility model.

[0220] An illustrative embodiment of this utility model, such as Figure 11 As shown, a keyway machining system includes a milling machine clamping and fixing device 100 and a milling machine 200 as described in Embodiment 1. The milling machine 200 is equipped with the milling machine clamping and fixing device 100.

[0221] The usage method of this embodiment is basically the same as that of Embodiment 1, and will not be repeated here.

[0222] The technical effects of this embodiment are basically the same as those of Embodiment 1, and will not be repeated here.

[0223] The above description is only a preferred embodiment of the present utility model and does not limit the implementation method and protection scope of the present utility model. Those skilled in the art should realize that all solutions obtained by equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A milling machine clamping and fixing device for clamping and fixing a workpiece to be milled with a keyway, characterized in that, include: A base unit for mounting on a milling machine; A positioning unit is disposed on the upper end face of the base unit and is used to position the end of the workpiece; A clamping unit is disposed on the upper end face of the base unit and located on the side of the positioning unit, for clamping the bottom surface of the workpiece; A locking unit is disposed on the upper end face of the base unit and located on the side of the clamping unit, for locking the side end face of the workpiece; An eccentric clamping unit is disposed on the upper end face of the base unit and located between the clamping unit and the locking unit, for clamping the workpiece; The locking unit includes: A seventh mounting element is disposed on the upper end face of the base unit and located between the locking unit and the eccentric clamping unit, and is detachably connected to the base unit. A first guide element is disposed on the upper end face of the seventh mounting element; A first locking element is movably disposed on the first guide element for locking the side end face of the workpiece; A second locking element is disposed at the end of the first guide element; A third locking element is disposed at the end of the first locking element; A fourth locking element is removably locked to the second locking element and the third locking element, respectively, for locking the relative position of the first locking element and the first guide element.

2. The milling machine clamping and fixing device according to claim 1, characterized in that, The base unit includes: Base element for mounting on a milling machine; A first mounting element is disposed on the upper end surface of the base element and is detachably connected to the positioning unit. The second mounting element is disposed on the upper end surface of the base element and located on the side of the first mounting element, and is detachably connected to the clamping unit. The third mounting element is disposed on the upper end surface of the base element and located on the side of the second mounting element, and is detachably connected to the locking unit; A fourth mounting element is disposed on the upper end face of the base element and located between the second mounting element and the third mounting element, and is detachably connected to the eccentric clamping unit.

3. The milling machine clamping and fixing device according to claim 1, characterized in that, The positioning unit includes: The fifth mounting element is disposed on the upper end face of the base unit and located on the side of the clamping unit, and is detachably connected to the base unit. The first positioning element is disposed on the upper end face of the fifth mounting element and is used to position the end of the workpiece.

4. The milling machine clamping and fixing device according to claim 3, characterized in that, The positioning unit further includes: The second positioning element is disposed on the side end face of the first positioning element; The third positioning element has a first end that is detachably connected to the second positioning element, and a second end that protrudes from the side end face of the first positioning element for positioning the end of the workpiece.

5. The milling machine clamping and fixing device according to claim 1, characterized in that, The clamping unit includes: The sixth mounting element is disposed on the upper end face of the base unit and located between the positioning unit, the locking unit and the eccentric clamping unit, and is detachably connected to the base unit. A first clamping element is disposed on the upper end face of the sixth mounting element and is used to abut against one side of the bottom surface of the workpiece. The second clamping element is disposed on the upper end face of the sixth mounting element and is symmetrically arranged with the first clamping element. It is used to abut against the other side of the workpiece to cooperate with the first clamping element to abut against the bottom end face of the workpiece.

6. The milling machine clamping and fixing device according to claim 1, characterized in that, The eccentric clamping unit includes: The eighth mounting element is disposed on the upper end face of the base unit and located between the clamping unit and the locking unit, and is detachably connected to the base unit; A first rotating element is disposed on the upper end face of the eighth mounting element; An eccentric element, which is rotatably disposed on the first rotating element; The second rotating element is eccentrically disposed from the eccentric element and rotatably connected to the eccentric element; A clamping element, which is connected to the second rotating element, is used to be in a clamping position to clamp the side end face of the workpiece or in a release position to release the workpiece under the action of the second rotating element. The second guide element is disposed on the upper end surface of the base unit and is detachably connected to the base unit; The third guide element is connected to the clamping element and is movably connected to the second guide element, and is used to reciprocate along the second guide element under the action of the clamping element.

7. The milling machine clamping and fixing device according to claim 6, characterized in that, The eccentric clamping unit further includes: An elastic element, disposed between the second guide element and the third guide element, is used to provide an elastic force; and / or A handle element, which is connected to the eccentric element, is used to drive the eccentric element to rotate.

8. A keyway machining system, characterized in that, include: The milling machine clamping and fixing device as described in any one of claims 1 to 7; A milling machine, wherein the milling machine is provided with a milling machine clamping and fixing device.

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