Rapid measurement method for navigation casting case

Abstract

The invention belongs to the technical field of detection, and particularly relates to a rapid measurement method for a navigation casting case. Comprising the steps that 1, a main coordinate system Z is established according to a main area with the most detection elements, and the establishment principle of the main coordinate system Z is that milled faces and holes are selected, and elements formed through one-time machining are selected for establishment of the main coordinate system Z; 2, measuring measurement elements under the main coordinate system; step 3, measuring a first area detection element after the processing reference transformation: establishing an initial positioning sub-coordinate system Z1 in the first area, and then establishing a fine positioning sub-coordinate system Z2; the first area is any area except the main area; step 4, measuring a first area measurement element; and 5, returning to the main coordinate system. Automatic measurement of the navigation casting case is achieved through the modular programming method, the detection efficiency and precision are improved, the detection strength is reduced, and the universality and applicability of a detection program can be effectively improved through the modular programming method.

Description

Technical Field

[0001] The invention belongs to the field of detection technology, and in particular relates to a rapid measurement method for a navigation casting chassis. Background Art

[0002] The navigation casting chassis has a huge structure. After secondary processing, there are many inspection factors, and there are hundreds of inspection factors in a single process. The inspection work intensity is high. The navigation casting chassis often adopts multi-reference processing. In the same process, different processing contents have different processing references, and the reference changes are many. In addition, the casting body of the navigation casting chassis has low shape accuracy and large individual differences in shape dimensions, which makes alignment difficult and has low alignment accuracy, which also affects the measurement accuracy.

[0003] Conventional machining inspection program programming methods are not suitable for casting chassis, that is, the program has poor versatility and repeatedly collides during program measurement. The above reasons make it difficult to implement the universal inspection program for navigation casting chassis. The current inspection still uses manual inspection methods, that is, various pads, vises, and inspection boxes are used as auxiliary tools, and calipers and height gauges are used for manual inspection on the inspection platform. The inspection efficiency is low and the inspection accuracy is poor. Summary of the Invention

[0004] The present invention provides a rapid measurement method for a navigation casting chassis, which solves the problems of large individual differences in casting chassis, difficulty in precise positioning during the detection process, multi-reference processing, and easy collision of stylus needles caused by conventional programming ideas, as well as low versatility and applicability of the program. The invention realizes automated measurement of the navigation casting chassis through a modular programming method, improves detection efficiency and accuracy, and reduces detection intensity. The modular programming method can effectively improve the versatility and applicability of the detection program.

[0005] The technical solution of the present invention: A rapid measurement method for a navigation casting chassis, the method comprising: Step 1: First, establish the main coordinate system Z in the main area with the most detection elements. The principle of establishing the main coordinate system Z is: select the milling surface and hole, and select the elements formed by one processing; Step 2: Measure the measurement elements in the principal coordinate system; Step 3: Measure the detection elements of the first area after the machining datum transformation: establish an initial locator coordinate system Z1 in the first area, and then establish a precise locator coordinate system Z2; the first area is any area except the main area; Step 4: Measure the first area measurement elements; Step 5: Return to the main coordinate system.

[0006] Further, In step 1, the first implementation of the principal coordinate system Z is: When establishing the principal coordinate system Z using two holes, first take points within 3mm of the hole end face to complete the surface element measurement, then select two holes distributed on a straight line to perform circle element measurement, and construct the principal coordinate system Z based on the surface element and circle element.

[0007] Further, In step 1, the second implementation of the principal coordinate system Z is: When establishing the principal coordinate system Z using the three elements of point, line and surface, first pick points on the milled surface and measure the surface elements as surface one. Then select another surface perpendicular to surface one to measure the line elements. Finally, select a hole to measure the circle elements. Construct the principal coordinate system Z based on the surface elements, line elements and circle elements.

[0008] Further, Step 3 is specifically as follows: the main coordinate system Z remains unchanged, and the detection elements of the first area after the processing reference transformation are measured under the main coordinate system Z. Before measurement, an initial positioning sub-coordinate system Z1 is first established. The coordinate origin and coordinate direction of the initial positioning sub-coordinate system Z1 are consistent with the main coordinate system Z. Then, a precise positioning sub-coordinate system Z2 is established under the initial positioning sub-coordinate system Z1. The direction and coordinate origin of the precise positioning sub-coordinate system Z2 are established according to the actual measurement needs of the first area.

[0009] Further, When constructing the initial positioner coordinate system Z1, the plane, hole, and groove processed by milling in the first area are selected, and the initial positioner coordinate system Z1 is established through the above elements.

[0010] Further, The principle for selecting planes, holes and slots for milling in the first area is to select the larger size elements in the first area. The larger size elements refer to: the diameter of the hole is greater than Φ5 and the width of the slot is greater than 5.

[0011] Further, The establishment of the precise positioner coordinate system Z2 uses elements with a shape tolerance less than 0.02.

[0012] Further, The measured features of each area are evaluated in the principal coordinate system.

[0013] The technical solution of the present invention provides a method for rapid measurement of a navigation casting chassis. The effect of the present invention is embodied in a modular programming method: (1) through the establishment of three-level coordinate systems, namely the main measurement coordinate system, the initial positioning sub-coordinate system, and the precise positioning sub-coordinate system, each processing area can be measured separately without mutual interference and disorder. The main coordinate system determines the measurement space position of the navigation casting chassis and is responsible for the measurement of the main measurement area. The establishment of the guide sub-coordinate system is a reference for the initial positioning sub-coordinate system and the precise positioning sub-coordinate system. It is also the confirmation of the spatial position of each measurement area when the measurement starts and the identification of entering a new measurement task. The initial positioning sub-coordinate system is responsible for the preliminary positioning of the measurement area and the guidance of the precise positioning sub-coordinate system. The position coordinate system is established under the guidance of the main measurement coordinate system and the initial position coordinate system. It is the final coordinate system when measuring each measurement area. The purpose is to improve the positioning accuracy of each measurement area and avoid collision problems caused by low shape accuracy and large individual differences in shape dimensions when measuring other navigation casting chassis. (2) The establishment of each coordinate system is given a corresponding establishment principle. (3) After the measurement task of each measurement area is completed, it returns to the main coordinate system to ensure that the coordinate system is not disordered when measuring in multiple coordinate systems, and it is also convenient for rapid problem location during program verification. (4) The measurement results of each area are evaluated in the main measurement coordinate system to ensure the accuracy of the position evaluation of the measurement elements in different measurement areas. Through the combination of the above four aspects, the feasibility, applicability and versatility of the navigation casting chassis automatic inspection program are realized, thereby improving the detection efficiency and detection accuracy. DETAILED DESCRIPTION

[0014] The specific technical solutions of the present invention are described in detail below.

[0015] The present invention provides a method for quickly measuring a navigation casting chassis, the method comprising: Step 1: First, establish the main coordinate system Z in the main area with the most detection elements. The principle of establishing the main coordinate system Z is: select the milling surface and hole, and select the elements formed by one processing; Step 2: Measure the measurement elements in the principal coordinate system; Step 3: Measure the detection elements of the first area after the machining datum transformation: establish an initial locator coordinate system Z1 in the first area, and then establish a precise locator coordinate system Z2; the first area is any area except the main area; Step 4: Measure the first area measurement elements; Step 5: Return to the main coordinate system.

[0016] In step 1, the first implementation of the principal coordinate system Z is: When establishing the principal coordinate system Z using two holes, first take points within 3mm of the hole end face to complete the surface element measurement, then select two holes distributed on a straight line to perform circle element measurement, and construct the principal coordinate system Z based on the surface element and circle element.

[0017] In step 1, the second implementation of the principal coordinate system Z is: When establishing the principal coordinate system Z using the three elements of point, line and surface, first pick points on the milled surface and measure the surface elements as surface one. Then select another surface perpendicular to surface one to measure the line elements. Finally, select a hole to measure the circle elements. Construct the principal coordinate system Z based on the surface elements, line elements and circle elements.

[0018] Step 3 is specifically as follows: the main coordinate system Z remains unchanged, and the detection elements of the first area after the processing reference transformation are measured under the main coordinate system Z. Before measurement, an initial positioning sub-coordinate system Z1 is first established. The coordinate origin and coordinate direction of the initial positioning sub-coordinate system Z1 are consistent with the main coordinate system Z. Then, a precise positioning sub-coordinate system Z2 is established under the initial positioning sub-coordinate system Z1. The direction and coordinate origin of the precise positioning sub-coordinate system Z2 are established according to the actual measurement needs of the first area.

[0019] When constructing the initial positioner coordinate system Z1, the plane, hole, and groove processed by milling in the first area are selected, and the initial positioner coordinate system Z1 is established through the above elements.

[0020] The principle for selecting planes, holes and slots for milling in the first area is to select the larger size elements in the first area. The larger size elements refer to: the diameter of the hole is greater than Φ5 and the width of the slot is greater than 5.

[0021] The establishment of the precise positioner coordinate system Z2 uses elements with a shape tolerance less than 0.02.

[0022] The measured features of each area are evaluated in the principal coordinate system.

[0023] Specifically, an embodiment of the present invention provides a rapid measurement method for a navigation casting chassis, wherein the area with the most detection elements is used as the first measurement area, and a main measurement coordinate system Z is established. The establishment principle is as follows: (1) the milled surface and hole are selected, and one coordinate system is established by selecting elements formed by one process; (2) when two holes are used to establish a coordinate system, first, points are collected in a small range on the end face of the hole to complete the surface element measurement, and then two holes distributed on a straight line are selected and measured separately to perform circle element measurement; (3) when three elements of point, line and surface are used to establish a coordinate system, first, points are collected on a larger milled surface to perform surface element measurement, which is surface one, and then another surface perpendicular to surface one is selected to perform line element measurement, and finally, a hole is selected to perform circle element measurement.

[0024] Modular programming is adopted: the main program performs the initial positioning of the parts and the distribution of measurement tasks. Each detection area has an independent subroutine. The subroutine locates each processing area of ​​the part separately and is also responsible for the detection of processing elements in this area. All subroutines are called by the main program. When each subroutine completes the task of detecting the area it is responsible for, the coordinate system returns to the main program coordinate system. Multiple coordinate systems coexist and are responsible for positioning and detection of different areas.

[0025] First, establish the main coordinate system Z with the main area with the most detection elements. The main coordinate system is constructed by selecting elements under the same processing positioning datum, and measuring the measurement elements of the area corresponding to the main coordinate system Z. After the measurement task of the area is completed, the main coordinate system Z remains unchanged. Measure the detection elements of other areas after the processing datum is transformed under the main coordinate system Z. Before measurement, the initial locator coordinate system Z1 must be established. The coordinate origin and coordinate direction of the initial locator coordinate system Z1 are consistent with the main coordinate system Z. When constructing the initial locator coordinate system Z1, the planes, holes, and slots milled in the area are selected. The selection principle is to give priority to the larger size elements of the measurement area. The diameter of the hole is greater than Φ5, and the width of the slot is greater than 5. The initial locator coordinate system Z1 is completed through the establishment of the above elements. Then, the precise locator coordinate system Z2 is established under the initial locator coordinate system Z1. The direction and coordinate origin of the precise locator coordinate system Z2 are established according to the actual measurement needs of this area, and can be inconsistent with the coordinate systems Z and Z1. To establish the precise positioning sub-coordinate system Z2, elements with a shape tolerance less than 0.02 should be selected. Afterwards, the measurement task of the area is completed under the coordinate system Z2. Subsequently, it returns to the main coordinate system Z, which means that the measurement of the elements under a processing positioning reference is completed. The purpose of returning to the coordinate system Z is to facilitate the establishment of the initial positioning coordinate system of the remaining processing areas with consistent reference. The precise positioning sub-coordinate systems are independent of each other and do not interfere with each other (only related to the main coordinate system Z); afterwards, the measurement elements of other areas are measured with the same steps. After the measurement task is completed, return to the main measurement coordinate system to evaluate the shape, position and size of all measurement elements.

[0026] The technical solution of the present invention provides a method for rapid measurement of a navigation casting chassis. The effect of the present invention is embodied in a modular programming method: (1) through the establishment of three-level coordinate systems, namely the main measurement coordinate system, the initial positioning sub-coordinate system, and the precise positioning sub-coordinate system, each processing area can be measured separately without mutual interference and disorder. The main coordinate system determines the measurement space position of the navigation casting chassis and is responsible for the measurement of the main measurement area. The establishment of the guide sub-coordinate system is a reference for the initial positioning sub-coordinate system and the precise positioning sub-coordinate system. It is also the confirmation of the spatial position of each measurement area when the measurement starts and the identification of entering a new measurement task. The initial positioning sub-coordinate system is responsible for the preliminary positioning of the measurement area and the guidance of the precise positioning sub-coordinate system. The position coordinate system is established under the guidance of the main measurement coordinate system and the initial position coordinate system. It is the final coordinate system when measuring each measurement area. The purpose is to improve the positioning accuracy of each measurement area and avoid collision problems caused by low shape accuracy and large individual differences in shape dimensions when measuring other navigation casting chassis. (2) The establishment of each coordinate system is given a corresponding establishment principle. (3) After the measurement task of each measurement area is completed, it returns to the main coordinate system to ensure that the coordinate system is not disordered when measuring in multiple coordinate systems, and it is also convenient for rapid problem location during program verification. (4) The measurement results of each area are evaluated in the main measurement coordinate system to ensure the accuracy of the position evaluation of the measurement elements in different measurement areas. Through the combination of the above four aspects, the feasibility, applicability and versatility of the navigation casting chassis automatic inspection program are realized, thereby improving the detection efficiency and detection accuracy.

Claims

1. A rapid measurement method for a navigation casting chassis, characterized in that: The method comprises: Step 1: First, establish the main coordinate system Z in the main area with the most detection elements. The principle of establishing the main coordinate system Z is: select the milling surface and hole, and select the elements formed by one processing; Step 2: Measure the measurement elements in the principal coordinate system; Step 3: Measure the detection elements of the first area after the machining datum transformation: establish an initial locator coordinate system Z1 in the first area, and then establish a precise locator coordinate system Z2; the first area is any area except the main area; Step 4: Measure the first area measurement elements; Step 5: Return to the main coordinate system.

2. A rapid measurement method for a navigation casting chassis according to claim 1, characterized in that: In step 1, the first implementation of the principal coordinate system Z is: When establishing the principal coordinate system Z using two holes, first take points within 3mm of the hole end face to complete the surface element measurement, then select two holes distributed on a straight line to perform circle element measurement, and construct the principal coordinate system Z based on the surface element and circle element.

3. The rapid measurement method of a navigation casting chassis according to claim 1 is characterized in that: In step 1, the second implementation of the principal coordinate system Z is: When establishing the principal coordinate system Z using the three elements of point, line and surface, first pick points on the milled surface and measure the surface elements as surface one. Then select another surface perpendicular to surface one to measure the line elements. Finally, select a hole to measure the circle elements. Construct the principal coordinate system Z based on the surface elements, line elements and circle elements.

4. The rapid measurement method for a navigation casting chassis according to claim 1 is characterized in that: Step 3 is specifically as follows: the main coordinate system Z remains unchanged, and the detection elements of the first area after the processing reference transformation are measured under the main coordinate system Z. Before measurement, an initial positioning sub-coordinate system Z1 is first established. The coordinate origin and coordinate direction of the initial positioning sub-coordinate system Z1 are consistent with the main coordinate system Z. Then, a precise positioning sub-coordinate system Z2 is established under the initial positioning sub-coordinate system Z1. The direction and coordinate origin of the precise positioning sub-coordinate system Z2 are established according to the actual measurement needs of the first area.

5. A rapid measurement method for a navigation casting chassis according to claim 4, characterized in that: When constructing the initial positioner coordinate system Z1, the plane, hole, and groove processed by milling in the first area are selected, and the initial positioner coordinate system Z1 is established through the above elements.

6. A method for rapid measurement of a navigation casting chassis according to claim 4, characterized in that: The principle for selecting planes, holes and slots for milling in the first area is to select the larger size elements in the first area. The larger size elements refer to: the diameter of the hole is greater than Φ5 and the width of the slot is greater than 5.

7. A method for rapid measurement of a navigation casting chassis according to claim 4, characterized in that: The establishment of the precise positioner coordinate system Z2 uses elements with a shape tolerance less than 0.

02.

8. The rapid measurement method for a navigation casting chassis according to claim 4 is characterized in that: The measured features of each area are evaluated in the principal coordinate system.