An off-machine blank measuring device

Abstract

The application discloses a kind of off-machine blank measuring devices, including cross sliding mechanism, measuring block, digital display ruler, reference chuck, bottom plate and tray;Digital display ruler is installed on cross sliding mechanism, cross sliding mechanism includes X-axis guide rail, Y-axis guide rail, first slider, second slider and slide plate, X-axis guide rail is installed on bottom plate by guide rail seat, Y-axis guide rail is installed on the second slider of X-axis guide rail by slide plate, measuring block is fixed on the first slider of Y-axis guide rail by support;Reference chuck is installed on bottom plate.Blank is installed on reference chuck with tray, so that three measuring surfaces in the inside of measuring block sequentially contact blank, according to the number shown on digital display ruler, the position of blank relative to reference chuck is obtained, so as to determine the position of blank on machining center, and the measuring process of blank on machining center can be saved.

Description

Technical Field

[0001] This invention belongs to the field of measuring devices, specifically an external blank measuring device. Background Technology

[0002] In CNC machining, it is necessary to measure the actual position of the workpiece in the machine tool before machining begins. Currently, there are two measurement methods:

[0003] The first method is "in-machine measurement," commonly known as "tool setting." This involves mounting the blank on the machine tool and then using a cutting tool or a special probe to sequentially contact the four sides and top of the blank to determine its position on the machine. The disadvantage of this method is that it requires machine time, reducing machine utilization and increasing the workload of the machine operator.

[0004] The second method is "online measurement" on a flexible manufacturing production line. This involves using a coordinate measuring machine (CMM) on the production line to measure the position of the blank relative to the zero-point quick-change fixture. The system then calculates the blank's position on the machining center. This method eliminates the need for the blank to be positioned on the machining center, improving machine tool utilization. However, it has the disadvantages of higher production line investment costs and the use of valuable precision measuring equipment, making it less suitable for small businesses. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides an external blank measuring device that enables the position of the workpiece blank to be determined even after it has left the machining center.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] An external blank measuring device includes a cross sliding mechanism, a measuring block, a position detection component, a reference chuck, a base plate, and a tray. The cross sliding mechanism includes an X-axis guide rail, a Y-axis guide rail, a first slider, a second slider, and a sliding plate. Two X-axis guide rails are mounted on the base plate via guide rail seats. The second slider is mounted on the X-axis guide rail, and the sliding plate is mounted on the second slider. The Y-axis guide rail is mounted on the sliding plate, and the first slider is mounted on the Y-axis guide rail. The X-axis and Y-axis guide rails are perpendicular to each other in a horizontal plane. A bracket is mounted on the first slider, and the measuring block is fixed to the bracket. The measuring block has a hollow structure and contains a left... The measurement surface includes a right measurement surface and a rear measurement surface. The position detection component includes an X-axis digital movable ruler, an X-axis digital fixed ruler, a Y-axis digital fixed ruler, and a Y-axis digital movable ruler. The X-axis digital fixed ruler is mounted on one of the X-axis guide rails, and the X-axis movable ruler is fitted onto the X-axis digital fixed ruler and mounted on the second slider. The Y-axis digital fixed ruler is mounted on the Y-axis guide rail, and the Y-axis movable ruler is fitted onto the Y-axis digital fixed ruler and mounted on the first slider. The reference chuck is mounted on the base plate and located on one side of the X-direction of the cross sliding mechanism. The reference chuck is located below the measuring block, and a tray is mounted on the reference chuck for placing the blank for external measurement.

[0008] The reference chuck is provided with several limit posts of equal height and four positioning bosses. Two positioning bosses are located on the X-axis centerline of the reference chuck, and the other two positioning bosses are located on the Y-axis centerline of the reference chuck. The X-axis of the reference chuck is parallel to the X-axis guide rail. The upper surfaces of the limit posts form the XY plane of the reference chuck. The center of the two positioning bosses collinear on the X-axis and the plane perpendicular to the XY plane form the XZ plane of the reference chuck. The center of the two positioning bosses collinear on the Y-axis and the plane perpendicular to the XY plane form the YZ plane of the reference chuck. The intersection of the XY plane, the ZX plane, and the ZY plane is the reference center of the reference chuck.

[0009] The height of the positioning boss is higher than that of the limiting post. The bottom of the tray is provided with a slot that matches the positioning boss. The tray rests on the limiting post of the reference chuck, and the top of the positioning boss is locked in the slot of the tray.

[0010] The bottom of the base plate is equipped with leveling and locking bolts.

[0011] There are gaps between the left and right measuring surfaces and the rear measuring surface.

[0012] The X-axis digital display ruler is mounted on the X-axis guide rail via a connecting plate, and the Y-axis digital display ruler is mounted on the Y-axis guide rail via a connecting plate.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The external blank measuring device provided by this invention involves a measuring block that moves in both the X and Y directions in a horizontal plane during operation. The three inner measuring surfaces sequentially contact the sides of the blank. The position of the blank relative to the reference chuck can be obtained based on the readings of the X-axis and Y-axis digital display scales. This position can be used to determine the blank's location on the machining center. This external blank measuring device allows the blank measurement work to be completed outside the machining center, eliminating the need for measurement on the machining center, greatly simplifying the machine tool operator's work steps, and improving machine tool utilization. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0016] In the attached diagram:

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention (horizontal angle).

[0018] Figure 2 This is a schematic diagram of the overall structure of the present invention (vertical angle).

[0019] Figure 3 This is a schematic diagram of the present invention after the tray and blank are installed;

[0020] Figure 4 This is a schematic diagram showing the position of the top of the blank;

[0021] Figure 5 This is a schematic diagram showing the side position of the tray;

[0022] Figure 6 This is a schematic diagram showing the positions of each side of the tray;

[0023] In the diagram: 1-X-axis digital display moving scale; 2-X-axis digital display fixed scale; 3-base bolt; 4-reference chuck; 5-limiting post; 6-positioning boss; 7-rear measuring surface; 8-left measuring surface; 9-measuring block; 10-Y-axis guide rail; 11-first slider; 12-bracket; 13-Y-axis digital display fixed scale; 14-Y-axis digital display moving scale; 15-second slider; 16-X-axis guide rail; 17-guide rail seat; 18-base plate; 19-right measuring surface; 20-connecting plate; 21-slide plate; 22-tray; 23-blank. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings.

[0025] like Figure 1-4As shown, the external blank measuring device provided by this invention includes a cross sliding mechanism (including X-axis guide rail 16, Y-axis guide rail 10, first slider 11, second slider 15 and slide plate 21), measuring block 9, position detection components (including X-axis digital display moving ruler 1, X-axis digital display fixed ruler 2, Y-axis digital display fixed ruler 13 and Y-axis digital display moving ruler 14), quick positioning device (reference chuck 4), and support and connecting components (including guide rail seat 17, base plate 18, connecting plate 20, bracket 12 and base bolts 3). Using this device requires a matching tray 22, and a reference chuck 4 of the same model must also be installed on the machining center.

[0026] The cross-shaped sliding mechanism is mounted on the base plate 18. Its movement in two directions is ensured to be perpendicular to each other, forming the X-axis and Y-axis of the mechanism. The directions of the X-axis and Y-axis define the direction of the horizontal plane. The cross-shaped sliding mechanism includes an X-axis guide rail 16, a Y-axis guide rail 10, a first slider 11, a second slider 15, and a sliding plate 21. There are two X-axis guide rails 16, each mounted on the base plate 18 via guide rail seats 17, ensuring they are parallel and at the same height, forming the X-axis of the cross-shaped sliding mechanism. Each X-axis guide rail 16 has a second slider 15, and the sliding plate 21 is mounted on the second slider 15. The Y-axis guide rail 10 is mounted on the sliding plate 21, and the first slider 11 is mounted on the Y-axis guide rail 10. The Y-axis guide rail 10 is mounted on the second slider 15 of the X-axis guide rail 16 via the sliding plate 21, ensuring perpendicularity to the X-axis, thus forming the Y-axis of the mechanism. The X-axis and Y-axis together define the horizontal plane of the mechanism.

[0027] The X-axis digital display fixed ruler 2 is mounted on one of the X-axis guide rails 16 via a connecting plate 20, ensuring parallelism with the X-axis guide rail 16. The X-axis digital display movable ruler 1 is fitted onto the X-axis digital display fixed ruler 2 and mounted on the second slider 15. The Y-axis digital display fixed ruler 13 is mounted on the Y-axis guide rail 10 via a connecting plate 20, ensuring parallelism with the Y-axis guide rail 10. The Y-axis digital display movable ruler 14 is fitted onto the Y-axis digital display fixed ruler 13 and mounted on the first slider 11. These components constitute the position detection unit.

[0028] The reference chuck 4 is mounted on the base plate 18 and located on one side of the cross sliding mechanism in the X direction. The reference chuck 4 has four equal-height limiting posts 5 at its four corners, and four positioning bosses 6 on its surface. Two of these bosses 6 are located on the X-axis centerline of the reference chuck 4, and the other two are located on the Y-axis centerline. The X and Y axes of the reference chuck 4 are parallel to the X and Y axes of the mechanism, respectively. The upper surfaces of all the limiting posts 5 on the reference chuck 4 form the XY plane of the reference chuck 4; a plane passing through the center of a pair of collinear positioning bosses 6 on the X-axis and perpendicular to the XY plane forms the XZ plane of the reference chuck 4; and a plane passing through the center of another pair of collinear positioning bosses 6 on the Y-axis and perpendicular to the XY plane forms the YZ plane of the reference chuck 4. During installation, ensure that the XY plane of the reference chuck 4 is parallel to the horizontal plane of the mechanism; simultaneously ensure that the XZ plane of the reference chuck 4 is parallel to the X-axis of the mechanism, or that the YZ plane of the reference chuck 4 is parallel to the Y-axis of the mechanism. The intersection of the three planes XY, ZX, and ZY defines the reference center of the reference chuck 4.

[0029] The height of the positioning boss 6 is slightly higher than that of the limiting post 5. The bottom of the tray 22 is provided with a slot that matches the positioning boss 6. When the tray 22 is installed on the reference chuck 4, the four corners of the tray 22 are on the four limiting posts 5 of the reference chuck 4, and the top of the positioning boss 6 is locked in the slots on the four bottom edges of the tray 22, thereby limiting and positioning the tray 22.

[0030] The foot bolts 3 are installed at the bottom of the base plate 18. The height and level of the base plate 18 are adjusted and locked by the nuts on the foot bolts 3.

[0031] The measuring block 9 is connected to the cross sliding mechanism via the bracket 12, and can move horizontally with the cross sliding mechanism. The bracket 12 is fixed on the first slider 11. The measuring block 9 has a hollow structure with three measuring surfaces: left, rear, and right. The left measuring surface 8 and the right measuring surface 19 are parallel to each other and both are perpendicular to the rear measuring surface 7. There are gaps between the three measuring surfaces for easy manufacturing and cleaning. During installation, ensure that the left measuring surface 8 (or the right measuring surface 19) is perpendicular to the horizontal plane of the mechanism, and at the same time ensure that the rear measuring surface 7 is perpendicular to the horizontal plane of the mechanism. When the measuring block 9 moves in the horizontal plane, it will drive the X-axis digital display ruler 1 and the Y-axis digital display ruler 14 to move together. The digital displays on the X-axis digital display ruler 1 and the Y-axis digital display ruler 14 can display the changes in the X-axis and Y-axis positions. During operation, the tray 22 containing the blank 23 is first installed on the reference chuck 4. The operator pushes the bracket 12 to bring the measuring block 9 closer to the blank. Make the left, rear, and right measuring surfaces of the measuring block 9 contact the sides of the blank 23 in sequence, and record the reading at each contact point. By calculating the correspondence between the position of the measuring block 9 and the reading of the digital display ruler, the position of each side of the blank 23 relative to the reference chuck 4 can be determined, thereby determining the position of the blank 23 on the machining center, which can save the measurement process of the blank 23 on the machining center.

[0032] The specific measurement process of the external blank measuring device of the present invention is given below.

[0033] First, select a specific point M on the digital model as the programming origin. Record the distances (ΔXM, ΔYM, ΔZM) of this point relative to the reference center on the reference chuck 4. Then, use a special tool T0 (such as a photoelectric probe or centering rod) on the machining center to determine a machining origin N. Ensure that the distances (ΔXN, ΔYN, ΔZN) of the machining origin N relative to the reference center on the reference chuck 4 are consistent with (ΔXM, ΔYM, ΔZM) in the digital model. Once the positions of the specific point M and the machining origin N are determined, they will not be changed and will serve as the programming origin and machining origin for all subsequent cases.

[0034] During operation, first install the tray 22 containing the blank 23 onto the reference chuck 4 (see...). Figure 3 The measuring block 9 is pushed so that the left measuring surface 8, the rear measuring surface 7, and the right measuring surface 19 sequentially contact the left, rear, and right sides of the blank 23. The reading of the digital display scale is recorded when each measuring surface contacts the blank 23. Based on the correspondence between the position of the measuring surface and the reading of the digital display scale, the positions of the left, rear, and right sides of the blank 23 relative to the reference center of the reference chuck 4 are calculated.

[0035] The following are the methods for calculating the position of the left side of the blank:

[0036] X = XS - X0

[0037] In the formula, X is the distance between the left side of the blank and the YZ plane of the reference chuck; XS is the reading of the measuring ruler when the left measuring surface contacts the blank; and X0 is the reading of the measuring ruler when the left measuring surface is located on the YZ plane of the reference chuck.

[0038] Due to the distance from the side of tray 22 to the XZ plane of the reference chuck ( Figure 5 The distance s in the chuck is fixed, and the position of the front side of the blank on the reference chuck is also fixed. The top height of the blank can be measured using other measuring tools, specifically by measuring the height of the top of the blank relative to the bottom of the pallet (see...). Figure 4 (h in the middle). Thus, the positions of the left, back, right, front, and top faces of the blank are determined (see h in the middle). Figure 6 ).

[0039] Based on the above measurement results, a digital model of the blank was created in CAD software. Figure 6 And programming is performed using a specific point M in the digital model as the programming origin.

[0040] After the program is input into the machine tool, you can start machining as long as you set the length compensation (i.e., the length difference between the tool and the special tool T0) in the tool list of the machine tool.

[0041] The above is a further detailed description of the present invention in conjunction with specific embodiments, and it should not be considered that the specific implementation of the present invention is limited to this. For those skilled in the art to which the present invention pertains and related fields, any extensions, operation methods, and data substitutions made based on the technical solution concept of the present invention should fall within the protection scope of the present invention.

Claims

1. An off-machine blank measuring device characterized by: The application relates to a cross slide mechanism, a measuring block (9), a position detection component, a reference chuck (4), a bottom plate (18) and a tray (22); the cross slide mechanism comprises X-axis guide rails (16), Y-axis guide rails (10), a first sliding block (11), a second sliding block (15) and a sliding plate (21), wherein the X-axis guide rails (16) are two, the X-axis guide rails (16) are installed on the bottom plate (18) through guide rail seats (17), the second sliding block (15) is arranged on the X-axis guide rails (16), the sliding plate (21) is installed on the second sliding block (15), the Y-axis guide rails (10) are installed on the sliding plate (21), the first sliding block (11) is arranged on the Y-axis guide rails (10), and the X-axis guide rails (16) and the Y-axis guide rails (10) are perpendicular to each other in a horizontal plane; the first sliding block (11) is provided with a support (12), the measuring block (9) is fixed on the support (12), the measuring block (9) is of a hollow structure, and a left measuring surface (8), a right measuring surface (19) and a rear measuring surface (7) are arranged in the measuring block (9); the position detection component comprises X-axis digital display fixed gauges (2), X-axis digital display movable gauges (1), Y-axis digital display fixed gauges (13) and Y-axis digital display movable gauges (14), the X-axis digital display fixed gauges (2) are installed on one of the X-axis guide rails (16), the X-axis digital display movable gauges (1) are sleeved on the X-axis digital display fixed gauges (2) and are installed on the second sliding block (15), the Y-axis digital display fixed gauges (13) are installed on the Y-axis guide rails (10), and the Y-axis digital display movable gauges (14) are sleeved on the Y-axis digital display fixed gauges (13) and are installed on the first sliding block (11); the reference chuck (4) is installed on the bottom plate (18) and is located on the X-direction side of the cross slide mechanism, the reference chuck (4) is located below the measuring block (9), the reference chuck (4) is provided with the tray (22) and is used for placing a blank (23) to perform off-machine measurement; bottom feet bolts (3) with leveling and locking functions are installed at the bottom of the bottom plate (18); and gaps are arranged between the left measuring surface (8), the right measuring surface (19) and the rear measuring surface (7).

2. The off-machine blank measuring device of claim 1, wherein: A plurality of equal-height limiting columns (5) are arranged on the reference chuck (4), four positioning bosses (6) are arranged on the reference chuck (4), two of the positioning bosses (6) are located on the X-axis centerline of the reference chuck (4), the other two positioning bosses (6) are located on the Y-axis centerline of the reference chuck (4), the X-axis of the reference chuck (4) is parallel to the X-axis guide rails (16), the upper surfaces of the limiting columns (5) form the XY plane of the reference chuck (4), the center of the two positioning bosses (6) which are collinear along the X-axis and which are perpendicular to the XY plane form the XZ plane of the reference chuck (4), the center of the two positioning bosses (6) which are collinear along the Y-axis and which are perpendicular to the XY plane form the YZ plane of the reference chuck (4), and the intersection of the XY plane, the ZX plane and the ZY plane is the reference center of the reference chuck (4).

3. An off-machine blank measurement device according to claim 2, characterized in that: The height of the positioning boss (6) is higher than the limiting column (5), the bottom of the tray (22) is provided with a clamping groove matched with the positioning boss (6), the tray (22) falls on the limiting column (5) of the reference chuck (4), and the top of the positioning boss (6) is clamped in the clamping groove of the tray (22).

4. Off-machine blank measurement device according to any one of claims 1-3, characterized in that: The X-axis digital ruler (2) is installed on the X-axis guide rail (16) through the connecting plate (20), and the Y-axis digital ruler (13) is installed on the Y-axis guide rail (10) through the connecting plate (20).

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