Flexible auxiliary guaranteeing device and guaranteeing method for perpendicularity of curved surface manual drilling

Abstract

The invention discloses a curved surface manual drilling verticality flexible auxiliary guarantee device and guarantee method, and the method comprises the steps: solving an allowable displacement difference value based on a drilling verticality allowable error and a trigonometric function position relation among three groups of rod-shaped linear displacement sensors; the actual displacement difference value between every two of the three rod-shaped linear displacement sensors is compared with the allowable displacement difference value so as to judge whether the drilling perpendicularity reaches the standard or not; the angle deviation between the center line of the drill bit and the normal of the drilling point in the drilling process can be guaranteed to be within the allowable range, then the perpendicularity of manual drilling at various angles is guaranteed, and the problem that the installation stress of a connecting piece is concentrated due to hole position inclination is solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of manual curved surface drilling, and particularly relates to a flexible auxiliary guarantee device and guarantee method for the perpendicularity of manual curved surface drilling. BACKGROUND

[0002] The perpendicularity of manual drilling is highly dependent on the experience of an operator, and the drilling process lacks quantitative and visual monitoring means, so the quality of the drilling perpendicularity is highly dependent on the experience of the operator, and the deviation of the perpendicularity leads to a gap problem after the installation of a connecting piece.

[0003] Generally, the drilling alignment module of a numerical control machine tool has a cross-shaped distribution structure formed by four sensors, and on the one hand, the pressing head on the numerical control machine tool can be used as a mounting support point of the laser sensor. However, the sensor needs to avoid the tool part on the air drill, and if the sensor is attached to the structure by means of an extension rod, the rigidity of the support part is difficult to guarantee, and the vibration caused by the drilling process will cause the cantilever to shake, resulting in a large measurement error. Therefore, the sensor can only be fixed by the non-rotating part of the air drill, which increases the measurement distance of the sensor, and if the installation parameters of the sensor are not appropriate, the laser signal may not be received, or the curved surface determined by the three points where the laser measurement points are located is too large, and cannot be approximated as a plane, resulting in a large perpendicularity calculation error.

[0004] Therefore, in view of the defects and inadaptability of the drilling alignment module of the numerical control machine tool in the manual drilling of a curved surface, the application discloses a flexible auxiliary guarantee device and guarantee method for the perpendicularity of manual curved surface drilling. SUMMARY

[0005] The application discloses a flexible auxiliary guarantee device and guarantee method for the perpendicularity of manual curved surface drilling, which can guarantee that the angle deviation between the center line of the drill and the normal line at the drilling point is within the allowable range during the drilling process, thereby ensuring the perpendicularity of the manual drilling at various angles and preventing the stress concentration problem of the connecting piece caused by the inclination of the hole position.

[0006] The application is implemented by the following technical scheme:

[0007] The flexible auxiliary guarantee device for the perpendicularity of manual curved surface drilling comprises a fixed support, three groups of non-coplanar limiting cylinders are uniformly arranged around the fixed support, equal-length linear displacement assemblies are slidingly inserted into the interiors of the three groups of limiting cylinders, and a return spring is arranged between the inner wall of the limiting cylinder and the linear displacement assembly.

[0008] In order to better implement the application, further, the linear displacement assembly comprises a rod-shaped linear displacement sensor, and the rod-shaped linear displacement sensor is slidingly inserted into the interior of the limiting cylinder.

[0009] Further, a fixed bolt is threadedly installed on the cylinder wall of the limiting cylinder, and one end of the fixed bolt abuts against the side surface of the rod-shaped linear displacement sensor.

[0010] The curved surface manual hole drilling perpendicularity flexible auxiliary guarantee method compares the actual displacement difference between the three rod-shaped linear displacement sensors with the allowed displacement difference to determine whether the hole drilling perpendicularity meets the standard.

[0011] Further, the method specifically comprises the following steps:

[0012] Step 1, installing the hole drilling tool on the fixed support, and abutting the end of the hole drilling tool against the hole drilling center;

[0013] Step 2, calculating the length of any two rod-shaped linear displacement sensors;

[0014] Step 3, calculating the allowed length difference between the two rod-shaped linear displacement sensors based on the hole drilling perpendicularity error;

[0015] Step 4, reading the displacement readings of the three rod-shaped linear displacement sensors, and determining that the hole drilling perpendicularity meets the standard when the reading difference of the three rod-shaped linear displacement sensors after being combined in pairs is less than the allowed length difference.

[0016] Further, the length of the first rod-shaped linear displacement sensor is calculated in step 2 as follows:

[0017]

[0018] wherein L1 represents the length of the first rod-shaped linear displacement sensor, AC represents the distance from the end of the first rod-shaped linear displacement sensor away from the hole drilling surface to the hole drilling center, ∠ACD represents the included angle between the line connecting the end of the first rod-shaped linear displacement sensor away from the hole drilling surface and the hole drilling center and the line connecting the end of the first rod-shaped linear displacement sensor abutting against the hole drilling surface and the hole drilling center, L represents the length of the hole drilling tool after removing the clamping end, d represents the perpendicular line length between the end of the first rod-shaped linear displacement sensor away from the hole drilling surface and the hole drilling tool axis, α represents the included angle between the hole drilling axis and the hole drilling tool axis, γ1 represents the included angle between the axis of the first rod-shaped linear displacement sensor and the hole drilling tool axis, and ε represents the included angle between the axis of the first rod-shaped linear displacement sensor and the hole drilling axis.

[0019] Further, the length of the second rod-shaped linear displacement sensor is calculated in step 2 as follows:

[0020] wherein L2 represents the length of the second rod-shaped linear displacement sensor, AC represents the distance from the end of the second rod-shaped linear displacement sensor away from the hole drilling surface to the hole drilling center, ∠ACD represents the included angle between the line connecting the end of the second rod-shaped linear displacement sensor away from the hole drilling surface and the hole drilling center and the line connecting the end of the second rod-shaped linear displacement sensor abutting against the hole drilling surface and the hole drilling center, L represents the length of the hole drilling tool after removing the clamping end, d represents the perpendicular line length between the end of the second rod-shaped linear displacement sensor away from the hole drilling surface and the hole drilling tool axis, α represents the included angle between the hole drilling axis and the hole drilling tool axis, γ2 represents the included angle between the axis of the second rod-shaped linear displacement sensor and the hole drilling tool axis, and ε represents the included angle between the axis of the second rod-shaped linear displacement sensor and the hole drilling axis.

[0021] Wherein: L2 represents the length of the second rod linear displacement sensor; CE represents the distance from the end of the second rod linear displacement sensor away from the drilling surface to the drilling center; ∠ECF represents the included angle between the line connecting the end of the second rod linear displacement sensor away from the drilling surface and the drilling center and the line connecting the end of the second rod linear displacement sensor abutting the drilling surface and the drilling center; L represents the length of the drilling tool after removing the clamping end; d represents the perpendicular length between the end of the second rod linear displacement sensor away from the drilling surface and the drilling tool axis; α' represents the included angle between the drilling axis and the drilling tool axis; γ2 represents the included angle between the axis of the second rod linear displacement sensor and the drilling tool axis; γ2 represents the included angle between the axis of the second rod linear displacement sensor and the drilling tool axis.

[0022] In order to better realize the present application, further, in the step 3, the calculation formula of the allowable length difference is as follows:

[0023] ΔL = |L1-L2|; Wherein: ΔL represents the allowable length difference.

[0024] ΔL = |L1-L2|; Wherein: ΔL represents the allowable length difference.

[0025] Compared with the prior art, the present application has the following advantages and beneficial effects:

[0026] The present application fills the blank of the verticality of manual drilling under various angle conditions, and uses objective and data processing based accurate measurement and calculation to replace subjective and visual and hand feeling based experience determination, which is helpful to avoid the hole position inclination problem of manual drilling, improve the verticality qualification rate of manual drilling, and improve the drilling quality. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a structural schematic view of the auxiliary protection device;

[0028] Figure 2 It is a top view of the auxiliary protection device;

[0029] Figure 3 It is Figure 2 A-A sectional view of the auxiliary protection device;

[0030] Figure 4 It is a schematic view of the included angle between the axes of the two rod linear displacement sensors;

[0031] Figure 5 It is a schematic view of the trigonometric function relationship of the auxiliary protection device;

[0032] Figure 6A schematic diagram of the trigonometric function relationship between the first rod-shaped linear displacement sensor and the hole-making tool;

[0033] Figure 7 This is a schematic diagram illustrating the trigonometric function relationship between the second rod-shaped linear displacement sensor and the hole-making tool.

[0034] Wherein: 1-fixed bracket; 2-rod-shaped linear displacement sensor; 3-limiting cylinder; 4-fixed pin; 5-reset spring. Detailed Implementation

[0035] Example 1:

[0036] The flexible auxiliary device for ensuring the verticality of manual hole making on curved surfaces in this embodiment, such as... Figures 1-4 As shown, the device includes a fixed bracket 1, around which three sets of non-coplanar limiting cylinders 3 are evenly distributed. Each of the three limiting cylinders 3 has a linear displacement component of equal length slidably inserted inside. A return spring 5 is provided between the inner wall of the limiting cylinder 3 and the linear displacement component. The linear displacement component includes a rod-shaped linear displacement sensor 2, which is slidably inserted inside the limiting cylinder 3. A fixing pin 4 is threaded onto the wall of the limiting cylinder 3, with one end of the fixing pin 4 abutting against the side of the rod-shaped linear displacement sensor 2.

[0037] The fixed bracket 1 is used to connect the drilling tool. Three sets of limiting cylinders 3 are located around the drilling tool, and the three sets of limiting cylinders 3 are not coplanar, that is, the three sets of rod-shaped linear displacement sensors 2 are not coplanar. During drilling, the end of the drilling tool abuts against the center of the hole. In the actual drilling environment, there will be an angle between the axis of the drilling tool and the axis of the hole, and this angle is the perpendicularity error of the hole. When the end of the drilling tool abuts against the center of the hole, the ends of the three sets of rod-shaped linear displacement sensors 2 will also abut against the curved surface of the hole, thus causing the three sets of rod-shaped linear displacement sensors 2 to produce different displacements. The state of the three sets of rod-shaped linear displacement sensors 2 can be locked by the fixing pin 4 to avoid subsequent movement of the rod-shaped linear displacement sensors 2 causing reading errors. After the rod-shaped linear displacement sensors 2 are separated from the curved surface of the hole, the ends of the rod-shaped linear displacement sensors 2 are no longer under pressure. At this time, under the action of the return spring 5, the three sets of rod-shaped linear displacement sensors 2 are driven back to the initial zero position.

[0038] A flexible auxiliary method for ensuring the perpendicularity of manual hole making on curved surfaces is proposed. Based on the allowable error of hole perpendicularity and the trigonometric function positional relationship between three sets of rod-shaped linear displacement sensors 2, the allowable displacement difference is calculated. The actual displacement difference between each pair of the three rod-shaped linear displacement sensors 2 is compared with the allowable displacement difference to determine whether the hole perpendicularity meets the standard.

[0039] The rest of this embodiment is the same as that of Embodiment 1, so it will not be described again.

[0040] Embodiment 2

[0041] The curved surface manual hole drilling verticality flexible auxiliary protection method specifically comprises the following steps:

[0042] Step 1, install the hole drilling tool on the fixed support 1, and abut the end of the hole drilling tool against the hole center;

[0043] Step 2, calculate the length of any two rod-shaped linear displacement sensors 2;

[0044] Step 3, calculate the allowable length difference between the two rod-shaped linear displacement sensors 2 based on the hole drilling verticality error;

[0045] Step 4, read the displacement readings of the three rod-shaped linear displacement sensors 2, and the reading difference after the three rod-shaped linear displacement sensors 2 are combined in pairs is less than the allowable length difference, then it is judged that the hole drilling verticality meets the standard.

[0046] As shown in Figure 5 , Figure 6 , a trigonometric function relationship diagram between the first rod-shaped linear displacement sensor and the rod-shaped linear displacement sensor as the reference is established, that is:

[0047] OC=OA×cosα;

[0048] AC=OC×tanα;

[0049] BC=AC×cos(180°-θ);

[0050] AB=AC×sin(180°-θ);

[0051]

[0052] The parameters α, L, and X in the figure are known data, in order to facilitate calculation, here γ1=γ2=γ, and accordingly the length L1 of the first rod-shaped linear displacement sensor 2 is solved, which is as follows:

[0053] ε=γ-α;

[0054] d=L×tanγ+X; X represents the horizontal distance between the end of the rod-shaped linear displacement sensor close to the hole drilling surface and the hole center;

[0055]

[0056]

[0057] ∠CAD=360°-∠ABC-∠BCD-∠CDA-∠BAC

[0058] = 360° - 90° - (90° + a) - (90° + e) - ∠BAC = 90° - γ - ∠BAC;

[0059] ∠ACD = 180° - ∠CAD - ∠CDA = 180° - (90° - γ - ∠BAC) - (90° + e) = a + ∠BAC;

[0060] According to the sine theorem, we have:

[0061]

[0062] That is:

[0063]

[0064] As shown in Figure 5 , Figure 7 , a trigonometric function relationship diagram between the second rod linear displacement sensor and the rod linear displacement sensor as a reference is established, that is:

[0065] φ = γ + a';

[0066] d = L x tan γ + X; X represents the horizontal distance between the end of the rod linear displacement sensor close to the hole making surface and the hole making center;

[0067]

[0068] ∠CEF = 360° - ∠EBC - ∠BCF - ∠CFE - ∠BEC

[0069] = 360° - 90° - (90° - a') - (90° + φ) - ∠BEC = 90° - γ - ∠BEC;

[0070] ∠ECF = 180° - ∠CEF - ∠EFC = 180° - (90° - γ - ∠BEC) - (90° + φ) = ∠BEC - a';

[0071] According to the sine theorem, we have:

[0072]

[0073] That is:

[0074]

[0075] Then the allowable length difference is:

[0076]

[0077] The above is the preferred embodiment of the present application, and does not limit the present application in any form, and any simple modification or equivalent change of the above embodiment according to the technical essence of the present application falls within the protection scope of the present application.

Claims

1. A flexible auxiliary device for ensuring the verticality of manually drilled holes on curved surfaces, comprising a fixed bracket (1), characterized in that, Three sets of non-coplanar limiting cylinders (3) are evenly distributed around the fixed bracket (1). Each of the three sets of limiting cylinders (3) has a linear displacement component of equal length slidably inserted inside. A return spring (5) is provided between the inner wall of the limiting cylinder (3) and the linear displacement component.

2. The flexible auxiliary device for ensuring the perpendicularity of manual hole making on curved surfaces according to claim 1, characterized in that, The linear displacement assembly includes a rod-shaped linear displacement sensor (2), which is slidably inserted inside the limiting cylinder (3).

3. The flexible auxiliary device for ensuring the perpendicularity of manual hole making on curved surfaces according to claim 2, characterized in that, A fixing pin (4) is threaded onto the wall of the limiting cylinder (3), and one end of the fixing pin (4) abuts against the side of the rod-shaped linear displacement sensor (2).

4. A flexible auxiliary method for ensuring the perpendicularity of manually drilled holes on curved surfaces, implemented based on the device described in any one of claims 1-3, characterized in that, Based on the allowable error of hole verticality and the trigonometric function positional relationship between the three sets of rod-shaped linear displacement sensors (2), the allowable displacement difference is calculated. The actual displacement difference between each pair of the three rod-shaped linear displacement sensors (2) is compared with the allowable displacement difference to determine whether the hole verticality meets the standard.

5. The method for flexibly assisting in ensuring the perpendicularity of manually drilled holes on curved surfaces according to claim 4, characterized in that, Specifically, the following steps are included: Step 1: Install the hole-making tool on the fixed bracket (1) and abut the end of the hole-making tool (1) against the hole-making center; Step 2: Calculate the lengths of any two rod-shaped linear displacement sensors (2); Step 3: Calculate the allowable length difference between the two rod-shaped linear displacement sensors (2) based on the hole perpendicularity error; Step 4: Read the displacement readings of the three rod-shaped linear displacement sensors (2). If the difference between the readings of the three rod-shaped linear displacement sensors (2) after being combined in pairs is less than the allowable length difference, then the hole perpendicularity is judged to meet the standard.

6. The method for flexibly assisting in ensuring the perpendicularity of manually drilled holes on curved surfaces according to claim 5, characterized in that, The calculation of the length of the first rod-shaped linear displacement sensor (2) in step 2 is as follows: Where: L1 represents the length of the first rod-shaped linear displacement sensor; AC represents the distance from the end of the first rod-shaped linear displacement sensor away from the hole-making surface to the center of the hole; ∠ACD represents the angle between the line connecting the end of the first rod-shaped linear displacement sensor away from the hole-making surface to the center of the hole and the line connecting the end of the first rod-shaped linear displacement sensor in contact with the hole-making surface to the center of the hole; L represents the length of the hole-making tool after removing the clamping end; d represents the length of the perpendicular line between the end of the first rod-shaped linear displacement sensor away from the hole-making surface and the axis of the hole-making tool; α represents the angle between the hole-making axis and the axis of the hole-making tool; γ1 represents the angle between the axis of the first rod-shaped linear displacement sensor and the axis of the hole-making tool; ε represents the angle between the axis of the first rod-shaped linear displacement sensor and the hole-making axis.

7. The method for flexibly assisting in ensuring the perpendicularity of manually drilled holes on curved surfaces according to claim 6, characterized in that, The calculation of the length of the second rod-shaped linear displacement sensor (2) in step 2 is as follows: Where: L2 represents the length of the second rod-shaped linear displacement sensor; CE represents the distance from the end of the second rod-shaped linear displacement sensor away from the hole-making surface to the center of the hole; ∠ECF represents the angle between the line connecting the end of the second rod-shaped linear displacement sensor away from the hole-making surface to the center of the hole and the line connecting the end of the second rod-shaped linear displacement sensor in contact with the hole-making surface to the center of the hole; L represents the length of the hole-making tool after removing the clamping end; d represents the length of the perpendicular line between the end of the second rod-shaped linear displacement sensor away from the hole-making surface and the axis of the hole-making tool; α' represents the angle between the hole-making axis and the hole-making tool axis; γ2 represents the angle between the axis of the second rod-shaped linear displacement sensor and the axis of the hole-making tool. This indicates the angle between the axis of the second rod-shaped linear displacement sensor and the axis of the hole.

8. The method for flexibly assisting in ensuring the perpendicularity of manually drilled holes on curved surfaces according to claim 7, characterized in that, In step 3, the formula for calculating the allowable length difference is as follows: ΔL = |L1 - L2|; Where: ΔL represents the allowable length difference.

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