End face milling clamp for engine box body

Abstract

The utility model discloses an engine box body milling end face clamp, the engine box body comprises a left box body and a right box body, the clamp comprises a base, the base is provided with a left plate and a right plate, the left plate is provided with a left front positioning and pressing mechanism and a left rear positioning and pressing mechanism, and the right plate is provided with a left rear positioning and pressing mechanism. The left plate is provided with a left front positioning and pressing mechanism and a right front positioning and pressing mechanism, the left front positioning and pressing mechanism is used for positioning and pressing the left box body, the left rear positioning and pressing mechanism is used for positioning and pressing the other inverted left box body, the right plate is provided with a right front positioning and pressing mechanism and a right rear positioning and pressing mechanism, the right front positioning and pressing mechanism is used for positioning and pressing the right box body, and the right rear positioning and pressing mechanism is used for positioning and pressing the right box body. And the right rear positioning and pressing mechanism is used for positioning and pressing the other inverted right box body. According to the end face milling clamp for the engine box body, the machining efficiency can be improved.

Description

Technical Field

[0001] The utility model relates to a machining fixture, in particular to an engine case end face milling fixture. Background Art

[0002] A motorcycle engine has a housing, which is divided into a left housing and a right housing. The left housing and the right housing cooperate to form a cavity for accommodating a crankshaft and a connecting rod.

[0003] At the same time, the left box and the right box are both cast from aluminum alloy, which can reduce the workload of machining.

[0004] If necessary, the two surfaces of the left box body and the right box body that are in contact with each other and the two surfaces that are separated from each other are milled so that the two surfaces of the left box body and the right box body that are in contact with each other and the two surfaces that are separated from each other remain flat, so as to set the sealing gasket, thereby maintaining the sealing of the engine and avoiding leakage.

[0005] Typically, for a left box or a right box, a fixture is provided so that the side of the box faces upward, and then a milling cutter is lowered from above the fixture to complete the processing of one side of the box.

[0006] However, existing processing methods are inefficient. Utility Model Content

[0007] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides an engine case end face milling fixture, which can improve processing efficiency.

[0008] According to an embodiment of the utility model, an engine case milling end face clamp is provided, wherein the engine case includes a left case and a right case, and the clamp includes a base, wherein the base is provided with a left plate and a right plate, wherein the left plate is provided with a left front positioning and clamping mechanism and a left rear positioning and clamping mechanism, wherein the left front positioning and clamping mechanism is used to position and clamp the left case, and the left rear positioning and clamping mechanism is used to position and clamp the other inverted left case, and the right plate is provided with a right front positioning and clamping mechanism and a right rear positioning and clamping mechanism, wherein the right front positioning and clamping mechanism is used to position and clamp the right case, and the right rear positioning and clamping mechanism is used to position and clamp the other inverted right case.

[0009] An engine case end face milling fixture according to an embodiment of the utility model has at least the following beneficial effects:

[0010] 1. The utility model provides a left plate and a right plate, so as to conveniently divide the working table of the machine into two areas, one for processing the left box body and the other for processing the right box body. Thus, a left box body and a right box body can be processed to meet the needs of assembling an engine.

[0011] 2. The utility model can meet the need of processing the left box body and the right box body at the same time by setting the left plate and the right plate, and can also be disassembled and used to adapt to different machine tools or processing needs.

[0012] 3. The utility model provides a left front positioning and clamping mechanism and a left rear positioning and clamping mechanism, which facilitates firstly making one surface of the left box body face up and fix, and at the same time making the other surface of the other left box body face up and fix. Thus, the side surfaces of the two left boxes in different directions can be processed in one processing, and further, one left box body can be produced in one processing, and the processing efficiency is high.

[0013] 4. The utility model sets a left front positioning and clamping mechanism and a left rear positioning and clamping mechanism, so that when processing the left box body, the blank is first placed on the left front positioning and clamping mechanism to process one plane of the left box body, and then the left box body is turned over and placed in the left rear positioning and clamping mechanism to process the other surface of the left box body. At the same time, a new blank is placed in the left front positioning and clamping mechanism for further processing, which not only meets the need to produce one product at a time, but also enables the left box body to be transferred backwards in sequence, with a short moving distance and not easy to be installed incorrectly.

[0014] 5. The utility model provides a right front positioning and clamping mechanism and a right rear positioning and clamping mechanism, which facilitates firstly making one surface of the right box body face upward and fixed, and at the same time making the other surface of the other right box body face upward and fixed. Thus, the side surfaces of the two right boxes in different directions can be processed in one processing, and further, one right box body can be produced in one processing, and the processing efficiency is high.

[0015] 6. The utility model sets a right front positioning and clamping mechanism and a right rear positioning and clamping mechanism, so that when processing the right box body, the blank is first placed on the right front positioning and clamping mechanism to process one plane of the right box body, and then the right box body is turned over and placed in the right rear positioning and clamping mechanism to process the other surface of the right box body. At the same time, a new blank is placed in the right front positioning and clamping mechanism for further processing, which not only meets the need to produce one product at a time, but also enables the right box body to be transferred backwards in sequence, with a short moving distance and not easy to be installed incorrectly.

[0016] 7. The utility model can reduce the occupancy of the machine platform by clamping by processing two left boxes and two right boxes at the same time, such as reducing the number of times the door is opened and closed, and reducing the number of times the machine tool starts and ends processing, which is beneficial to improving production efficiency. At the same time, since the left box and the right box are clamped at the same time, the operator's familiarity with the left box and the right box can be enhanced, reducing the risk of incorrect installation and improving the operator's quality.

[0017] According to an engine case milling end face clamp of an embodiment of the utility model, at least one of the left front positioning and clamping mechanism, the left rear positioning and clamping mechanism, the right front positioning and clamping mechanism and the right rear positioning and clamping mechanism includes a positioning assembly and a clamping assembly, the positioning assembly includes two positioning cone pins arranged left and right, the positioning assembly also includes a plurality of support columns located at the front and rear sides of the two positioning cone pins, the clamping assembly includes a pressure block, a swing arm pressure rod on which the pressure block is installed, a hinged rod connecting the swing arm pressure rod, a cylinder push rod hinged to the swing arm pressure rod, and a cylinder body connected to the hinged rod, and the cylinder body is buried in the corresponding left plate or right plate.

[0018] According to an engine case end face milling fixture of an embodiment of the utility model, the positioning assembly also includes a first anti-error column arranged between the two positioning cone pins, and a plastic cap is arranged on the top of the first anti-error column.

[0019] According to an engine case end face milling fixture of an embodiment of the utility model, the plastic cap is rectangular.

[0020] According to an engine case milling end face fixture of an embodiment of the utility model, the positioning assembly also includes a first limiting column arranged on the front side and / or rear side of the two positioning cone pins, and a first limiting block arranged on the side of the first limiting column away from the two positioning cone pins, and a limiting gap is formed between the first limiting column and the first limiting block.

[0021] According to an engine case end face milling fixture of an embodiment of the utility model, a limiting recess is provided on a side of the first limiting block close to the first limiting column.

[0022] According to an engine case end face milling fixture of an embodiment of the utility model, the first limiting column of the rear positioning and clamping mechanism is higher than the first limiting column of the front positioning and clamping mechanism, and the first limiting block of the rear positioning and clamping mechanism is higher than the first limiting block of the front positioning and clamping mechanism.

[0023] According to an engine case milling end face clamp of an embodiment of the utility model, the swing arm pressure rod of at least one of the left rear positioning and clamping mechanism and the right rear positioning and clamping mechanism is in a Z shape, the pressure block and the hinge rod are respectively arranged at both ends of the swing arm pressure rod, the cylinder push rod is hinged on the Z shape near the turning point of the hinge rod, and the swing arm pressure rod is arranged between the two positioning cone pins.

[0024] According to an engine case milling end face clamp of an embodiment of the utility model, at least one of the left rear positioning and clamping mechanism and the right rear positioning and clamping mechanism is provided with a left limit block and a right limit block, and the left limit block and the right limit block are located on the side opposite to the two positioning cone pins.

[0025] According to an engine case end face milling fixture of an embodiment of the utility model, a right limiting notch is provided on the side of the left limiting block close to the positioning cone pin, and a left limiting notch is provided on the side of the right limiting block close to the positioning cone pin. The left limiting notch and the right limiting notch are used to fit the hole position of the case onto the positioning cone pin.

[0026] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0028] Figure 1 This is a schematic structural diagram of an engine case end face milling fixture according to an embodiment of the utility model;

[0029] Figure 2 for Figure 1 A schematic structural diagram of an engine case end face milling fixture is shown.

[0030] Figure numerals: 1-base, 2-left plate, 3-right plate, 4-left front positioning and clamping mechanism, 5-left rear positioning and clamping mechanism, 6-right front positioning and clamping mechanism, 7-right rear positioning and clamping mechanism, 8-positioning cone pin, 9-support column, 10-pressure block, 11-swing arm pressure rod, 12-hinge rod, 13-cylinder push rod, 14-anti-error column, 15-plastic cap, 16-first limiting column, 17-first limiting block, 18-left limiting block, 19-right limiting block. DETAILED DESCRIPTION

[0031] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0032] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of first and second, this is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation, connection and connection" 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 or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] An engine case end face milling fixture according to an embodiment of the utility model is described below in conjunction with the accompanying drawings.

[0036] Reference Figure 1 The utility model aims to provide an embodiment of an engine case milling end face fixture, which can complete the simultaneous processing of the engine case, improve the processing efficiency, and reduce the confusion in production management.

[0037] In the embodiment, the fixture is installed on a vertical milling machine. The tool of the milling machine can be raised and lowered, translated and rotated, thereby meeting the needs of starting and ending processing. At the same time, it can move horizontally and rotate, which is also convenient for processing a horizontal plane, and then, the end face of the box can be processed flat.

[0038] In this embodiment, the fixture is suitable for processing a motorcycle engine case, and the engine case includes a left case and a right case.

[0039] In this embodiment, the clamp may include a base 1 , and the base 1 is provided with a left plate 2 and a right plate 3 .

[0040] In some specific embodiments of the present invention, the left plate 2 and the right plate 3 can be directly mounted on the base 1, or the left plate 2 and the right plate 3 can be directly integrally formed on the base 1, but the material difference between the left plate 2 and the right plate 3 and the base 1 needs to be considered.

[0041] In some specific embodiments of the present invention, the base 1 can be made of iron castings to reduce costs while having a good shock-absorbing effect.

[0042] In some specific embodiments of the present invention, the left plate 2 and the right plate 3 can be made of steel plates, which are easy to purchase and low in cost. Moreover, they are easy to process into flat surfaces, which helps to improve the positioning and installation accuracy of the fixture.

[0043] Specifically, the left plate 2 is provided with a left front positioning and clamping mechanism 4 and a left rear positioning and clamping mechanism 5. The left front positioning and clamping mechanism 4 is used to position and clamp the left box body, and the left rear positioning and clamping mechanism 5 is used to position and clamp the other inverted left box body. The right plate 3 is provided with a right front positioning and clamping mechanism 6 and a right rear positioning and clamping mechanism 7. The right front positioning and clamping mechanism 6 is used to position and clamp the right box body, and the right rear positioning and clamping mechanism 7 is used to position and clamp the other inverted right box body.

[0044] In summary, this embodiment conveniently divides the workbench of the machine into two areas by setting the left plate 2 and the right plate 3, one for processing the left box body and the other for processing the right box body. Therefore, a left box body and a right box body can be processed to meet the needs of assembling an engine.

[0045] This embodiment provides a left plate 2 and a right plate 3, which can meet the need of processing the left box body and the right box body at the same time, and can also be disassembled and used to adapt to different machine tools or processing needs.

[0046] By setting the left front positioning and clamping mechanism 4 and the left rear positioning and clamping mechanism 5, this embodiment also facilitates first making one surface of the left box body face up and fix, and at the same time making the other surface of the other left box body face up and fix. Therefore, the side surfaces of the two left boxes in different directions can be processed in one processing, and further, one left box body can be produced in one processing, and the processing efficiency is high.

[0047] By setting the left front positioning and clamping mechanism 4 and the left rear positioning and clamping mechanism 5, this embodiment allows the blank to be placed on the left front positioning and clamping mechanism 4 first during the processing of the left box body, so that one plane of the left box body can be processed, and then the left box body is turned over and placed in the left rear positioning and clamping mechanism 5, so that the other surface of the left box body can be processed. At the same time, a new blank is placed in the left front positioning and clamping mechanism 4 for further processing, which not only meets the need of producing one product at a time, but also enables the left box body to be transferred backwards in sequence, with a short moving distance, and is not easy to be installed incorrectly.

[0048] By setting the right front positioning and clamping mechanism 6 and the right rear positioning and clamping mechanism 7, this embodiment also facilitates first making one surface of the right box body face up and fix, and at the same time making the other surface of the other right box body face up and fix. Therefore, the side surfaces of the two right boxes in different directions can be processed in one processing, and further, one right box body can be produced in one processing, and the processing efficiency is high.

[0049] By setting the right front positioning and clamping mechanism 6 and the right rear positioning and clamping mechanism 7, this embodiment allows the blank to be placed on the right front positioning and clamping mechanism 6 first during the processing of the right box body, so that one plane of the right box body can be processed, and then the right box body is turned over and placed in the right rear positioning and clamping mechanism 7, so that the other surface of the right box body can be processed. At the same time, a new blank is placed in the right front positioning and clamping mechanism 6 for further processing, which not only meets the need to produce one product at a time, but also enables the right box body to be transferred backwards in sequence, with a short moving distance, and is not easy to be installed incorrectly.

[0050] This embodiment can reduce the occupancy of the machine platform by clamping by processing two left boxes and two right boxes at the same time, such as reducing the number of times the door is opened and closed, and reducing the number of times the machine tool starts and ends processing, which is beneficial to improving production efficiency. At the same time, since the left box and the right box are clamped at the same time, the operator's familiarity with the left box and the right box can be enhanced, reducing the risk of incorrect installation and improving the operator's quality.

[0051] In some specific embodiments of the present invention, at least one of the left front positioning and clamping mechanism 4, the left rear positioning and clamping mechanism 5, the right front positioning and clamping mechanism 6 and the right rear positioning and clamping mechanism 7 can include a positioning assembly and a clamping assembly, the positioning assembly includes two positioning cone pins 8 arranged left and right, the positioning assembly also includes a plurality of support columns 9 located at the front and rear sides of the two positioning cone pins 8, the clamping assembly includes a pressure block 10, a swing arm pressure rod 11 for installing the pressure block 10, a hinged rod 12 connecting the swing arm pressure rod 11, a cylinder push rod 13 hinged to the swing arm pressure rod 11, and a cylinder body connected to the hinged rod 12, and the cylinder body is buried in the corresponding left plate 2 or right plate 3.

[0052] It should be noted that at least one of the left front positioning and clamping mechanism 4, the left rear positioning and clamping mechanism 5, the right front positioning and clamping mechanism 6 and the right rear positioning and clamping mechanism 7 includes a positioning component and a clamping component, which means that any one or more of the left rear positioning and clamping mechanism 5, the right front positioning and clamping mechanism 6 and the right rear positioning and clamping mechanism 7 can be set up as a reference, and some of them can also be different.

[0053] It is easy to understand that in this embodiment, by setting a positioning component, the positioning component includes two positioning cone pins 8, and it is also convenient to use the holes cast on the box body for positioning, so as to accurately determine the position of the box body, which helps to reduce the ineffective path of the tool, reduce the ineffective operation time, reduce the time cost and energy consumption cost, and improve efficiency.

[0054] At the same time, the two positioning cone pins 8 are conical, which can also help to adapt to the situation where the size and shape of the casting hole are greatly different.

[0055] In some specific embodiments of the present invention, the positioning cone pin 8 can be elastically raised and lowered under the support of the spring, thereby reducing the hard contact between the positioning cone pin 8 and the box body and avoiding damage to both.

[0056] In some specific embodiments of the present invention, the positioning assembly may further include a first anti-error column 14 disposed between the two positioning cone pins 8 , and a plastic cap 15 is disposed on the top of the first anti-error column 14 .

[0057] It is easy to understand that the present embodiment also prevents the box from being installed in the opposite directions of the left and right by providing the first error-proofing column 14. The plastic cap 15 can, on the one hand, make the first error-proofing column 14 protrude, which is easy to identify, and match it with the corresponding hole position on the box, which is not easy to match incorrectly. On the other hand, the plastic cap 15 contacts the box, which will not cause damage to the box, thus protecting the product.

[0058] In some specific embodiments of the present invention, the plastic cap 15 may be rectangular.

[0059] It is easy to understand that in this embodiment, by making the plastic cap 15 rectangular, on the one hand, it is convenient for processing and molding and reduces costs. On the other hand, it makes the four corners of the plastic cap 15 correspond to the holes of the box body, which not only meets the positioning requirements but also reduces the matching position, making it convenient to put the holes of the box body on the plastic cap 15, reducing friction and facilitating clamping and material removal.

[0060] In some specific embodiments of the present invention, the positioning assembly may also include a first limiting column 16 arranged on the front side and / or rear side of the two positioning cone pins 8, and a first limiting block 17 arranged on the side of the first limiting column 16 away from the two positioning cone pins 8, and a limiting gap is formed between the first limiting column 16 and the first limiting block 17.

[0061] It is easy to understand that the present embodiment uses the first limiting column 16, and it is also convenient to use the first limiting column 16 and the first limiting block 17. On the one hand, it ensures that the corresponding box is installed to avoid installing the wrong box.

[0062] At the same time, the setting of the limiting gap also facilitates the operator to correct the installation direction of the box as a whole, and facilitates the insertion of the hole position of the box and the positioning cone pin 8, so as to avoid the box being deflected at a small angle and not being installed in place.

[0063] In some specific embodiments of the present invention, a limiting recess may be provided on one side of the first limiting block 17 close to the first limiting column 16 .

[0064] It is easy to understand that, by providing the limiting recess, this embodiment also facilitates setting the limiting gap around the solid shape of the box body, thereby improving the reliability and accuracy of the limiting.

[0065] In some specific embodiments of the present invention, first limiting columns 16 may be provided on the front and rear sides of the two positioning cone pins 8 to further enhance the limiting effect.

[0066] In some specific embodiments of the present invention, the first limiting column 16 of the rear positioning and clamping mechanism can be higher than the first limiting column 16 of the front positioning and clamping mechanism, and the first limiting block 17 of the rear positioning and clamping mechanism can be higher than the first limiting block 17 of the front positioning and clamping mechanism.

[0067] It is easy to understand that this embodiment, by setting the first limit block 17 with a height difference, can, on the one hand, adapt to the situation where the height difference of the corresponding limit after the box is flipped over, and on the other hand, it can also make the gap between the box and the first limit block 17 smaller or flush, thereby reducing the foreign body sensation. Therefore, when the box is installed incorrectly, there is a large height difference between the box and the first limit block 17, which has a strong foreign body sensation and is easy to identify, thereby avoiding processing in the wrong installation state and reducing the risk of tool installation.

[0068] In some specific embodiments of the present invention, the clamping assembly may include four clamping points, so that the four corners of the box body are clamped and fixed, local warping is reduced, and processing quality is improved.

[0069] Reference Figure 2 In some specific embodiments of the utility model, the swing arm pressure rod 11 of at least one of the left rear positioning and clamping mechanism 5 and the right rear positioning and clamping mechanism 7 can be made into a Z shape, and a pressure block 10 and a hinge rod 12 are respectively arranged at both ends of the swing arm pressure rod 11, and the cylinder push rod 13 is hinged on the Z shape near the turning point of the hinge rod 12, and the swing arm pressure rod 11 is arranged between the two positioning cone pins 8.

[0070] It is easy to understand that this embodiment changes the shape of the swing arm pressure rod 11 to facilitate extending it from the hole of the box body and to achieve clamping from the inside of the box body, thereby overcoming the problem that there are no clamping points around the box body after the box body is inverted or that most of the clamping points coincide with the surface to be processed.

[0071] In some specific embodiments of the present invention, at least one of the left rear positioning and clamping mechanism 5 and the right rear positioning and clamping mechanism 7 can be provided with a left limit block 18 and a right limit block 19, and the left limit block 18 and the right limit block 19 are located on the side opposite to the two positioning cone pins 8.

[0072] It is easy to understand that the present embodiment also adapts to the changes in human posture during loading by providing the left limit block 18 and the right limit block 19. Since the person leans forward when loading the left rear positioning and clamping mechanism 5 and the right rear positioning and clamping mechanism 7, more strength is required to pick up the box, which causes instability and makes it difficult to accurately locate the positioning cone pin 8. The positioning cone pin 8 is prone to hard contact with the box. The provision of the left limit block 18 and the right limit block 19 also facilitates the preliminary limiting of the box and guides the box to the positioning cone pin 8, which helps to smoothly complete the clamping and helps to reduce the workload of clamping and adjustment.

[0073] In some specific embodiments of the present invention, a right limiting notch can be provided on the side of the left limiting block 18 close to the positioning cone pin 8, and a left limiting notch can be provided on the side of the right limiting block 19 close to the positioning cone pin 8. The left limiting notch and the right limiting notch are used to fit the hole position of the box body onto the positioning cone pin 8.

[0074] It is easy to understand that, in this embodiment, by providing the left limiting notch and the right limiting notch, it is helpful to limit the outer contour of the box body and improve the accuracy of the limiting guide.

[0075] In the description of this specification, the description with reference to the terms "one embodiment, some embodiments, illustrative embodiments, examples, specific examples or some examples" etc. 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 utility model. 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 any one or more embodiments or examples in a suitable manner.

[0076] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. An engine case milling end face fixture, the engine case comprising a left case and a right case, characterized in that: The clamp comprises a base (1), the base (1) is provided with a left plate (2) and a right plate (3), the left plate (2) is provided with a left front positioning and clamping mechanism (4) and a left rear positioning and clamping mechanism (5), the left front positioning and clamping mechanism (4) is used to position and clamp the left box body, the left rear positioning and clamping mechanism (5) is used to position and clamp the other inverted left box body, the right plate (3) is provided with a right front positioning and clamping mechanism (6) and a right rear positioning and clamping mechanism (7), the right front positioning and clamping mechanism (6) is used to position and clamp the right box body, and the right rear positioning and clamping mechanism (7) is used to position and clamp the other inverted right box body.

2. The engine case end face milling fixture according to claim 1, characterized in that: At least one of the left front positioning and clamping mechanism (4), the left rear positioning and clamping mechanism (5), the right front positioning and clamping mechanism (6) and the right rear positioning and clamping mechanism (7) comprises a positioning assembly and a clamping assembly, wherein the positioning assembly comprises two positioning cone pins (8) arranged on the left and right sides, and the positioning assembly further comprises a plurality of support columns (9) located at the front and rear sides of the two positioning cone pins (8); the clamping assembly comprises a pressure block (10), a swing arm pressure rod (11) on which the pressure block (10) is mounted, a hinged rod (12) connected to the swing arm pressure rod (11), a cylinder push rod (13) hinged to the swing arm pressure rod (11), and a cylinder body connected to the hinged rod (12), wherein the cylinder body is buried in the corresponding left plate (2) or right plate (3).

3. The engine case end face milling fixture according to claim 2, characterized in that: The positioning assembly further comprises a first anti-error column (14) arranged between the two positioning cone pins (8), and a plastic cap (15) is arranged on the top of the first anti-error column (14).

4. The engine case end face milling fixture according to claim 3, characterized in that: The plastic cap (15) is rectangular.

5. The engine case end face milling fixture according to claim 2, characterized in that: The positioning assembly further comprises a first limiting column (16) arranged on the front side and / or the rear side of the two positioning cone pins (8), and a first limiting block (17) arranged on the side of the first limiting column (16) away from the two positioning cone pins (8), wherein a limiting gap is formed between the first limiting column (16) and the first limiting block (17).

6. The engine case end face milling fixture according to claim 5, characterized in that: A limiting recess is provided on one side of the first limiting block (17) close to the first limiting column (16).

7. The engine case end face milling fixture according to claim 5, characterized in that: The first limiting column (16) of the rear positioning and clamping mechanism is higher than the first limiting column (16) of the front positioning and clamping mechanism, and the first limiting block (17) of the rear positioning and clamping mechanism is higher than the first limiting block (17) of the front positioning and clamping mechanism.

8. The engine case end face milling fixture according to claim 2, characterized in that: The swing arm pressure rod (11) of at least one of the left rear positioning and clamping mechanism (5) and the right rear positioning and clamping mechanism (7) is in a Z shape, the pressure block (10) and the hinge rod (12) are respectively arranged at both ends of the swing arm pressure rod (11), the cylinder push rod (13) is hinged on the Z shape near the turning point of the hinge rod (12), and the swing arm pressure rod (11) is arranged between the two positioning cone pins (8).

9. The engine case end face milling fixture according to claim 2, characterized in that: At least one of the left rear positioning and clamping mechanism (5) and the right rear positioning and clamping mechanism (7) is provided with a left limit block (18) and a right limit block (19), and the left limit block (18) and the right limit block (19) are located on the side opposite to the two positioning cone pins (8).

10. The engine case end face milling fixture according to claim 9, characterized in that: A right limiting notch is provided on the side of the left limiting block (18) close to the positioning cone pin (8), and a left limiting notch is provided on the side of the right limiting block (19) close to the positioning cone pin (8). The left limiting notch and the right limiting notch are used to fit the hole of the box body onto the positioning cone pin (8).

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