Reference surface machining tool and anti-deformation machining method for E-shaped connector

Abstract

The invention provides an E-shaped connector datum plane machining tool and an anti-deformation machining method.The E-shaped connector datum plane machining tool comprises a datum plane machining tool body and a finish machining tool body, and the E-shaped connector datum plane machining tool body comprises a datum plane machining tool body base 2, a bolt 3, a positioning pin 4, a notch pressing ring 5 and a pressing plate 6; the bolt 3, the positioning pin 4, the notch pressing ring 5 and the pressing plate 6 are installed on the datum plane machining tool base 2. The upper end face of the datum plane machining tool base 2 is a horizontal positioning face and used for horizontally positioning a workpiece. The side face of the datum plane machining tool base 2 is a vertical positioning face and used for vertically positioning a workpiece. The datum plane machining tool positioning pin 4 is an installation auxiliary positioning device and is used for auxiliary installation and supporting of a workpiece. And the E-shaped joint is positioned by using a horizontal positioning surface and a vertical positioning surface and is arranged on the reference surface processing tool base 2 through the bolt 3, the notch pressing ring 5 and the pressing plate 6.

Description

Technical Field

[0001] The invention belongs to a mechanical processing method, and in particular relates to a reference surface processing tool and an anti-deformation processing method for a chevron-shaped joint. Background Art

[0002] like Figure 1 As shown, the chevron joint products are widely used in load-bearing parts of aviation and aerospace, and most of them are critical parts, which directly affect flight safety. This type of product has the characteristics of long cantilever, thin wall thickness, and high processing precision. In order to ensure the performance of the chevron joint products, most of them are made of high-strength steel and titanium alloy materials, which puts high demands on the processing of the products. With the further requirements of aviation and aerospace products for structural weight reduction, the wall thickness requirements of the chevron joint are getting thinner and thinner, resulting in worse and worse rigidity of parts processing. At present, the processing of chevron joint products has the following problems:

[0003] 1. In order to minimize the deformation of the chevron joint caused by clamping during the finishing stage, it is necessary to ensure that the flatness of the finishing reference surface is no more than 0.02mm. Since titanium alloy materials are not suitable for grinding, the reference surface can only be processed by milling. The commonly used pressure plates and vise clamping methods will cause large clamping deformation, making it difficult to ensure the flatness requirements of the finishing reference surface;

[0004] 2. The two ears on the outside of the mountain-shaped joint are only about 5mm thick and about 60mm high. The structure is similar to a large tuning fork. The tool is very likely to let go and resonate during the cutting process. The let-down phenomenon causes the ear size tolerance to fail to meet the design requirements; the resonance phenomenon causes serious damage to the tool, resulting in poor surface roughness of the ear and even forcing the machine tool to stop processing. Summary of the invention

[0005] The present application provides a reference surface processing tool and an anti-deformation processing method for a U-shaped joint, which can solve the problem of tool chattering and poor surface finish during the cutting process caused by the poor rigidity of the U-shaped joint; and solve the problem that the shape and position tolerances of parts are difficult to meet assembly requirements due to the easy deformation of the fine machining reference preparation and clamping.

[0006] In the first aspect, the present application provides a chevron-shaped joint reference surface processing tool, including: a reference surface processing tool and a finishing tool, including a reference surface processing tool base 2, a bolt 3, a positioning pin 4, a notched pressure ring 5, and a pressure plate 6, wherein:

[0007] The datum surface processing tooling base 2 is an inverted T-shaped structure, and the bolts 3, positioning pins 4, notched pressure rings 5, and pressure plates 6 are installed on the datum surface processing tooling base 2. The upper end surface of the datum surface processing tooling base 2 is a horizontal positioning surface, which is used to horizontally position the workpiece; the side surface of the datum surface processing tooling base 2 is a vertical positioning surface, which is used to vertically position the workpiece; the datum surface processing tooling positioning pins 4 are installation auxiliary positioning devices, which are used to assist in the installation support of the workpiece. The mountain-shaped joint is positioned using the horizontal positioning surface and the vertical positioning surface and is installed on the datum surface processing tooling base 2 through bolts 3, notched pressure rings 5, and pressure plates 6.

[0008] The finishing tool comprises a finishing tool base 7 and bolts 8. The upper end surface of the finishing tool base 7 is a horizontal positioning surface for matching with the finishing reference surface, and the finishing tool bolts 8 are used to fix and press the chevron-shaped joint on the finishing tool base 7.

[0009] Specifically, the reference surface processing tooling base 2 is an inverted T-shaped structure, the upper end surface is a horizontal positioning surface, and the parallelism with the bottom plane is required to be within 0.02mm, and the side surface is a vertical positioning surface, and the perpendicularity with the bottom plane is required to be within 0.02mm.

[0010] Specifically, the reference surface processing tool bolts 3 are M12 hexagon socket bolts, 3 in total, which are used to fasten the chevron-shaped joint on the reference surface processing tool base 2 .

[0011] Specifically, the outer diameter of the reference surface processing tooling locating pin 4 is 0.1-0.2 mm smaller than the hole diameter of the middle ear piece of the mountain-shaped joint, the height is 8 mm, there is a 1×45 chamfer, the center is an M12 internal thread, and it is an auxiliary positioning device for installation, used to assist in the installation and support of the workpiece.

[0012] Specifically, the outer diameter of the reference surface processing tooling notch pressing ring 5 is 20 mm larger than the hole diameter of the chevron-shaped joint, and a 12 mm notch is opened to apply a pressing force to the chevron-shaped joint.

[0013] Specifically, the reference surface processing tooling pressing plate 6 is L-shaped, and its height is slightly higher than the thickness of the middle ear piece of the mountain-shaped joint.

[0014] Specifically, the bottom plate of the finishing tooling base 7 has 6 Φ12 through holes evenly distributed on it, which are used to connect to the workbench of the CNC machine tool. The upper end face is a horizontal positioning surface, and the parallelism with the bottom plane is required to be within 0.02mm. The length and width are consistent with the size of the bottom plate of the mountain-shaped joint, and there are 4 M12 threaded holes distributed at the four corners.

[0015] Specifically, the finishing tool bolts 8 are M12 bolts, 4 in total, which are used to deposit the chevron-shaped joint on the finishing tool base 7 .

[0016] In a second aspect, the present application provides a method for anti-deformation processing of a chevron-shaped joint, comprising:

[0017] Step 1: Use a universal vise to clamp the hexagonal blank of the chevron-shaped joint, perform rough machining on a CNC machining center, and reserve a total of 4 reinforcing ribs 1 on the sides of the two outer ears of the chevron-shaped joint;

[0018] Step 2: Heat treat the rough machined parts according to the design requirements;

[0019] Step 3, install the parts on the reference surface processing tooling base 2, use the positioning pin 4 to assist in positioning, use the bolt 3 and the notch pressure ring 5 to tighten the middle ear of the mountain-shaped joint, and process the reference surface on the CNC machining center to ensure that the flatness of the machined reference surface is within 0.02mm;

[0020] Step 4, install the chevron joint on the finishing tooling base 7, use a 0.02mm feeler gauge to check the fit between the finishing reference surface and the plane on the finishing tooling base to ensure complete fit, tighten the parts with bolts 8, and complete the finishing of the chevron joint on the CNC machining center;

[0021] Step 5: After processing, inspect as required.

[0022] Specifically, the reinforcing rib 1 on the two outer ears of the U-shaped joint is reserved using the blank margin of the outer ears of the U-shaped joint. The length is determined according to the height of the part, the width is 2 mm, and the height is determined according to the blank margin, which is used to strengthen the rigidity of the outer ears of the U-shaped joint.

[0023] In summary, the present invention provides a reference surface processing tooling and anti-deformation processing method for a mountain-shaped joint. The fine machining reference surface processing tooling has a simple structure, low manufacturing cost, simple and reliable operation, and can achieve stress-free clamping in the reference surface processing process; the method has strong applicability, and is particularly suitable for the processing of mountain-shaped and tuning fork-like structural parts. It can effectively enhance the rigidity of this type of parts, avoid deformation of the ears, and ensure the stability of the processing quality of the parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of a mountain-shaped joint;

[0025] Figure 2 A reinforcing rib for enhancing the rigidity of the outer ear piece of the chevron-shaped joint provided by the present invention;

[0026] Figure 3 A schematic diagram of a reference surface processing tool for a chevron-shaped joint provided by the present invention;

[0027] Figure 4 A schematic diagram of the reference surface machining and clamping provided for the invention;

[0028] Figure 5 A schematic diagram of a finishing tool for a chevron-shaped joint provided by the present invention;

[0029] Figure 6 A schematic diagram of the finishing clamping method provided for the invention;

[0030] Among them: 1-reinforcement rib, 2-reference surface processing tooling base, 3-bolt, 4-locating pin, 5-notch pressure ring, 6-pressure plate, 7-finishing tooling base, 8-bolt. DETAILED DESCRIPTION

[0031] The principle of this application is to utilize the machining allowance of the blank of the chevron joint. In the rough machining stage, a total of 4 reinforcing ribs with a width of 2mm are reserved for the two outer ears of the chevron joint to enhance the rigidity of the two outer ears of the chevron joint and reduce the vibration phenomenon of the entire machining process. In the reference surface machining stage before fine machining, a set of reference surface machining tooling is designed. Through the reference surface machining tooling, the clamping force is only applied to the middle ear of the chevron joint, ensuring that the two outer ears are in a suspended state, avoiding deformation of parts caused by clamping stress, and ensuring that the flatness of the fine machining reference surface is controlled within 0.02mm. During the finishing stage, a set of reference surface processing tooling is designed, and the U-shaped joint is installed on the finishing tooling to ensure that the finishing reference surface and the upper end surface of the finishing tooling are tightly fitted under a stress-free state. While retaining the four reinforcing ribs, the remaining characteristic surfaces of the U-shaped joint are processed. Finally, the reinforcing ribs are removed to ensure that the rigidity of the parts is in a reinforced state throughout the finishing process, while avoiding deformation of the parts caused by clamping stress and solving the problem of "opening" or "shrinking" of the two outer ears of the U-shaped joint.

[0032] A hexagonal blank of the chevron joint is clamped with a universal vise, and rough machining is performed on a CNC machining center, and a total of four reinforcing ribs 1 are reserved on the sides of the two outer ears of the chevron joint; then the rough-machined parts are heat treated according to the design requirements; after the heat treatment, the parts are installed on a reference surface machining tooling base 2, assisted in positioning by a locating pin 4, and the middle ear of the chevron joint is pressed with a bolt 3 and a notch pressure ring 5, and the reference surface is machined on the CNC machining center to ensure that the flatness of the machined reference surface is within 0.02 mm; the chevron joint is installed on a fine machining tooling base 7, and a 0.02 mm feeler gauge is used to check the fit between the fine machining reference surface and the plane on the fine machining tooling base to ensure complete fit, and the parts are pressed with a bolt 8 to complete the fine machining of the chevron joint on the CNC machining center.

[0033] Embodiment 1

[0034] like Figure 3 , Figure 5As shown, the present application provides a datum surface processing tool for a chevron-shaped joint, including: a datum surface processing tool and a finishing tool, wherein:

[0035] The datum surface processing tooling includes a datum surface processing tooling base 2, bolts 3, positioning pins 4, notched pressure rings 5, and pressure plates 6. The datum surface processing tooling base 2 is an inverted T-shaped structure, and the bolts 3, positioning pins 4, notched pressure rings 5, and pressure plates 6 are installed on the datum surface processing tooling base 2. The upper end surface of the datum surface processing tooling base 2 is a horizontal positioning surface, which is used to horizontally position the workpiece; the side surface of the datum surface processing tooling base 2 is a vertical positioning surface, which is used to vertically position the workpiece; the datum surface processing tooling positioning pin 4 is an auxiliary positioning device for installation, which is used to assist in the installation support of the workpiece. The mountain-shaped joint is positioned using the horizontal positioning surface and the vertical positioning surface and is installed on the datum surface processing tooling base 2 through bolts 3, notched pressure rings 5, and pressure plates 6.

[0036] The finishing tool comprises a finishing tool base 7 and bolts 8. The upper end surface of the finishing tool base 7 is a horizontal positioning surface for matching with the finishing reference surface, and the finishing tool bolts 8 are used to fix and press the chevron-shaped joint on the finishing tool base 7.

[0037] like Figure 1 As shown, the present application is applied to a herringbone joint.

[0038] Specifically, the reference surface processing tooling base 2 is an inverted T-shaped structure, the upper end surface is a horizontal positioning surface, and the parallelism with the bottom plane is required to be within 0.02mm, and the side surface is a vertical positioning surface, and the perpendicularity with the bottom plane is required to be within 0.02mm.

[0039] Specifically, the reference surface processing tool bolts 3 are M12 hexagon socket bolts, 3 in total, which are used to fasten the chevron-shaped joint on the reference surface processing tool base 2 .

[0040] Specifically, the outer diameter of the reference surface processing tooling locating pin 4 is 0.1-0.2 mm smaller than the hole diameter of the middle ear piece of the mountain-shaped joint, the height is 8 mm, there is a 1×45 chamfer, the center is an M12 internal thread, and it is an auxiliary positioning device for installation, used to assist in the installation and support of the workpiece.

[0041] Specifically, the outer diameter of the reference surface processing tooling notch pressing ring 5 is 20 mm larger than the hole diameter of the chevron-shaped joint, and a 12 mm notch is opened to apply a pressing force to the chevron-shaped joint.

[0042] Specifically, the reference surface processing tooling pressing plate 6 is L-shaped, and its height is slightly higher than the thickness of the middle ear piece of the mountain-shaped joint.

[0043] Specifically, the bottom plate of the finishing tooling base 7 has 6 Φ12 through holes evenly distributed on it, which are used to connect to the workbench of the CNC machine tool. The upper end face is a horizontal positioning surface, and the parallelism with the bottom plane is required to be within 0.02mm. The length and width are consistent with the size of the bottom plate of the mountain-shaped joint, and there are 4 M12 threaded holes distributed at the four corners.

[0044] Specifically, the finishing tool bolts 8 are M12 bolts, 4 in total, which are used to deposit the chevron-shaped joint on the finishing tool base 7 .

[0045] Embodiment 2

[0046] like Figure 2 , Figure 4 , Figure 6 As shown, the present application provides a method for anti-deformation processing of a mountain-shaped joint, comprising:

[0047] Step 1: Use a universal vise to clamp the hexagonal blank of the chevron-shaped joint, perform rough machining on a CNC machining center, and reserve a total of 4 reinforcing ribs 1 on the sides of the two outer ears of the chevron-shaped joint;

[0048] Step 2: Heat treat the rough machined parts according to the design requirements;

[0049] Step 3, install the parts on the reference surface processing tooling base 2, use the positioning pin 4 to assist in positioning, use the bolt 3 and the notch pressure ring 5 to tighten the middle ear of the mountain-shaped joint, and process the reference surface on the CNC machining center to ensure that the flatness of the machined reference surface is within 0.02mm;

[0050] Step 4, install the chevron joint on the finishing tooling base 7, use a 0.02mm feeler gauge to check the fit between the finishing reference surface and the plane on the finishing tooling base to ensure complete fit, tighten the parts with bolts 8, and complete the finishing of the chevron joint on the CNC machining center;

[0051] Step 5: After processing, inspect as required.

[0052] Specifically, the reinforcing rib 1 on the two outer ears of the U-shaped joint is reserved using the blank margin of the outer ears of the U-shaped joint. The length is determined according to the height of the part, the width is 2 mm, and the height is determined according to the blank margin, which is used to strengthen the rigidity of the outer ears of the U-shaped joint.

[0053] In summary, the present invention provides a reference surface processing tooling and anti-deformation processing method for a mountain-shaped joint. The fine machining reference surface processing tooling has a simple structure, low manufacturing cost, simple and reliable operation, and can achieve stress-free clamping in the reference surface processing process; the method has strong applicability, and is particularly suitable for the processing of mountain-shaped and tuning fork-like structural parts. It can effectively enhance the rigidity of this type of parts, avoid deformation of the ears, and ensure the stability of the processing quality of the parts.

Claims

1. A reference surface processing tool for a mountain-shaped joint, characterized in that: include: Datum surface machining tooling and finishing tooling, including: The datum surface processing tool comprises a datum surface processing tool base (2), a bolt (3), a positioning pin (4), a notch pressure ring (5), and a pressure plate (6), wherein: the datum surface processing tool base (2) is an inverted T-shaped structure, and the bolt (3), the positioning pin (4), the notch pressure ring (5), and the pressure plate (6) are installed on the datum surface processing tool base (2); the upper end surface of the datum surface processing tool base (2) is a horizontal positioning surface for horizontally positioning the workpiece; the side surface of the datum surface processing tool base (2) is a vertical positioning surface for vertically positioning the workpiece; the datum surface processing tool positioning pin (4) is an auxiliary positioning device for installing and supporting the workpiece; the chevron-shaped joint is positioned using the horizontal positioning surface and the vertical positioning surface and is installed on the datum surface processing tool base (2) through the bolt (3), the notch pressure ring (5), and the pressure plate (6); The finishing tool comprises a finishing tool base (7) and a bolt (8); the upper end surface of the finishing tool base (7) is a horizontal positioning surface for matching with the finishing reference surface, and the finishing tool bolt (8) is used to fix and press the chevron-shaped joint onto the finishing tool base (7).

2. The reference surface processing tool according to claim 1, characterized in that: The reference surface processing tooling base (2) is an inverted T-shaped structure, the upper end surface is a horizontal positioning surface, and the parallelism with the bottom plane is required to be within 0.02mm, and the side surface is a vertical positioning surface, and the perpendicularity with the bottom plane is required to be within 0.02mm.

3. The reference surface processing tool according to claim 1, characterized in that: The bolt (3) is an M12 hexagon socket bolt.

4. The reference surface processing tool according to claim 1, characterized in that: The outer diameter of the positioning pin (4) is 0.1-0.2 mm smaller than the hole diameter of the middle ear piece of the chevron-shaped joint, the height is 8 mm, there is a 1×45 chamfer, and the center is an M12 internal thread.

5. The reference surface processing tool according to claim 1, characterized in that: The outer diameter of the notch press ring (5) is 20 mm larger than the hole diameter of the mountain-shaped joint and is provided with a notch of 12 mm.

6. The reference surface processing tool according to claim 1, characterized in that: The pressing plate (6) is L-shaped, and its height is higher than the thickness of the middle ear piece of the mountain-shaped joint.

7. The reference surface processing tool according to claim 1, characterized in that: The bottom plate of the finishing tooling base (7) is evenly distributed with N Φ12 through holes for connection with the CNC machine tool workbench. The upper end surface is a horizontal positioning surface and the parallelism with the bottom plane is required to be within 0.02mm. The length and width dimensions are consistent with the dimensions of the bottom plate of the mountain-shaped joint, and 4 M12 threaded holes are distributed at the four corners.

8. The reference surface processing tool according to claim 1, characterized in that: The finishing tooling bolts 8 are M12 bolts, 4 in total.

9. A method for anti-deformation processing of a chevron-shaped joint, characterized in that: include: Step 1: Use a universal vise to clamp the hexagonal blank of the chevron-shaped joint, perform rough machining on a CNC machining center, and reserve a total of (4) reinforcing ribs (1) on the side surfaces of the two outer ears of the chevron-shaped joint; Step 2, heat treatment is performed on the rough-machined chevron joint; Step 3, install the chevron joint on the reference surface processing tooling base (2), use the positioning pin (4) to assist in positioning, use the bolt (3) and the notch pressure ring (5) to tighten the middle ear piece of the chevron joint, and process the reference surface on the CNC machining center to ensure that the flatness of the machined reference surface is within 0.02 mm; Step 4: Install the chevron joint on the finishing tooling base (7), use a 0.02mm feeler gauge to check the fit between the finishing reference surface and the plane on the finishing tooling base to ensure that they are completely fitted, tighten the parts with bolts (8), and complete the finishing of the chevron joint on a CNC machining center; Step 5: Inspect the U-shaped joint after processing.

10. The method according to claim 9, characterized in that: The reinforcing rib (1) is left on the margin of the outer ear piece of the U-shaped joint, the length is determined according to the height of the part, the width is 2mm, and the height is determined according to the margin of the blank, and is used to strengthen the rigidity of the outer ear piece of the U-shaped joint.

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