Positioning tool for three-coordinate detection of engine cylinder body

Abstract

The utility model provides a positioning tool for three-coordinate detection of an engine cylinder, the positioning tool comprises a reference bottom plate and a tool plate, the reference bottom plate is a double-sided high-parallelism flatness type rectangular plate, and the tool plate is fixedly arranged on the upper surface of the reference bottom plate through bolts. The outer edge of the tool plate is in positioning connection with the positioning pin on the upper surface of the reference bottom plate in a clamping mode, the positioning supporting column is arranged on the upper surface of the tool plate in a regular triangle mode, the shape of the positioning supporting column is a conical head type cylinder, and a conical head at the top end of the positioning supporting column is connected with a connecting hole in the end of the cylinder body in an inserted mode. The reference bottom plate can be arranged on the detection table of the three-coordinate measuring equipment in advance, then the tool plate is installed, the probability of manual operation errors is reduced, and the loss rate of the probe is also reduced. The measuring efficiency and the measuring precision are greatly improved, the labor intensity is reduced, the loss rate of the control box and the measuring pin is also reduced, and the operation and maintenance cost of the measuring machine is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of engine cylinder block detection tooling, and specifically relates to a positioning tooling for three-coordinate detection of an engine cylinder block. Background Art

[0002] Automobile cylinder block is an important key part of automobile, with high requirements on geometric dimensional accuracy and many evaluation parameters. The dimensional quality affects various parameters of the engine. How to comprehensively evaluate its dimensional parameters and strictly ensure the quality of the external dimensions?

[0003] As a common precision component in auto parts, the engine cylinder block usually needs to be inspected at multiple positions during processing and production. The existing inspection process operation mode is to manually place the cylinder block on the inspection table of the three-coordinate measuring equipment. The inspection table is designed with a fixture for positioning the cylinder block. After the cylinder block is positioned, the three-coordinate inspection software is manually operated to manually search for programs, import files, manually measure, manually pick points, edit after measurement, save reports, etc., edit drawings, pick points, inspect, edit measurement results, and output reports online. The entire inspection process is complicated, the equipment utilization rate is low, and the work intensity is high. In the actual production inspection, due to the different sizes, shapes, and structures of the workpieces, it is usually necessary to make corresponding fixtures and fix the measured parts on the three-coordinate work platform, and manually find the measurement points or set the measurement origin. This will reduce the efficiency of product inspection, cause repeated loading and unloading of fixtures and fixtures, increase the labor intensity of operators, increase the auxiliary time of inspection, fail to achieve full-automatic inspection, and reduce the measurement accuracy. Utility Model Content

[0004] In order to solve the above problems, this paper proposes a positioning tool for three-coordinate detection of an engine cylinder block, a cylinder block is arranged above the positioning tool, the positioning tool comprises a reference base plate and a tooling plate, the reference base plate is a rectangular plate with high parallelism and flatness on both sides, the upper surface of the reference base plate is provided with a tooling plate fixed by bolts, the tooling plate is in the shape of a rectangular plate, the outer edge of the tooling plate is connected to the positioning pin on the upper surface of the reference base plate by a snap-fitting manner, the upper surface of the tooling plate is provided with positioning pillars in the form of an equilateral triangle, the inverted triangle between the positioning pillars is provided with bolt through holes, and the front sides of the positioning pillars are provided with The auxiliary support and positioning support are shaped like cone-headed cylinders. The top cone of the positioning support is plugged into the connection hole at the end of the cylinder body. The top support of the auxiliary support is connected to the end face of the cylinder body. Through the double-layer positioning plate design, the reference base plate can be pre-set on the inspection table of the three-coordinate measuring equipment before installing the tooling plate, thereby realizing quick replacement and adjustment. Different tooling plates can also be replaced according to cylinders of different sizes, thereby realizing accurate positioning of the three-coordinate measuring equipment without manual point sampling, reducing the probability of manual operation errors, and reducing the loss rate of the measuring needle. Not only does it greatly improve the measurement efficiency and measurement accuracy, and reduce labor intensity, but it also reduces the loss rate of the control box and the measuring needle, reducing the operating and maintenance costs of the measuring machine.

[0005] The upper surface of the reference base plate is provided with positioning pins and bolt holes. The center spacing of the outer sides of the positioning pins is the same as the spacing between the midpoints of the outer edges of the tooling plate. The inner sides of the bolt holes are provided with threads. The bolt holes are connected to the tooling plate through fixing bolts and bolt through holes of the revolution plate. The bottom surface of the reference base plate is fixedly connected to the three-coordinate measuring device. Through the reference base plate, a reference positioning plate can be set on the detection table of the three-coordinate measuring device, which not only facilitates the rapid positioning of the two plates, but also has the effect of bolt fixing, thereby ensuring the stability of the connection.

[0006] The tooling plate is a rectangular plate with an outer contour smaller than the reference base plate. Positioning grooves are provided at the midpoints of the three edges of the tooling plate. The positioning grooves are semicircular in shape, and the diameter of the positioning grooves is the same as the diameter of the positioning pins. The tooling plate is connected to the positioning pins through the positioning grooves. The positioning grooves on the outside of the tooling plate can be used to quickly and accurately position the tooling plate, which can assist in the positioning of the locking bolts, limit the displacement of the bolt connection, and ensure the accurate positioning of the tooling plate.

[0007] The positioning pillar is in the shape of a vertical cylinder, and an equilateral parallel cone head is provided at the top of the positioning pillar. The top diameter of the cone head is smaller than the diameter of the connecting hole at the end of the cylinder body. The lower end of the positioning pillar is connected to the assembly plate, and the assembly plate is fixedly connected to the tooling plate. Through the cone-head positioning pillar, the cylinder body can be positioned conveniently and quickly, and it can also achieve an efficient fixing effect. Because the three-coordinate measuring equipment does not require excessive external force to exert force on the cylinder body, there is no need for high-strength fixture-type tooling, and a stable and efficient positioning and fixing effect can be achieved.

[0008] The auxiliary support is in the shape of a vertical elliptical column. The auxiliary support is symmetrically arranged below the inner edge of the cylinder body with respect to the longitudinal center line of the cylinder body. The lower end of the auxiliary support is connected to the assembly plate, and the assembly plate is fixedly connected to the tooling plate. The auxiliary support is used to provide auxiliary support to the cylinder body from the inside of the cylinder body, and the elliptical design can maximize the support while avoiding the positioning support to prevent interference.

[0009] The cylinder body is a combined engine valve body, the bottom end of the cylinder body is provided with a mounting flange edge, the middle part of the mounting flange edge is equidistantly provided with connecting holes, the inner side of the cylinder body is equidistantly provided with inner edges between the piston cylinders, and the inner edge of the bottom end is flush with the bottom end of the cylinder body.

[0010] Beneficial effects:

[0011] Through the double-layer positioning plate design, the reference base plate can be pre-set on the inspection table of the three-dimensional coordinate measuring equipment before installing the tooling plate, so as to achieve quick replacement and adjustment, and different tooling plates can be replaced according to cylinders of different sizes, so that the three-dimensional coordinate measuring equipment can be accurately positioned without manual point sampling, the probability of manual operation errors is reduced, and the loss rate of the measuring needle is also reduced. Not only does it greatly improve the measurement efficiency and measurement accuracy, and reduce labor intensity, but it also reduces the loss rate of the control box and the measuring needle, reducing the operation and maintenance costs of the measuring machine.

[0012] The reference base plate can be used to set a reference positioning plate on the inspection table of the three-coordinate measuring equipment, which can not only facilitate the rapid positioning of two plates, but also play the role of bolt fixing, ensuring the stability of the connection.

[0013] The positioning grooves on the outside of the tooling plate can be used for quick and accurate positioning, which can assist in the positioning of the locking bolts, limit the displacement of the bolt connection, and ensure the accurate positioning of the tooling plate.

[0014] The cone-head positioning support makes it possible to position the cylinder body quickly and easily, and can also achieve an efficient fixing effect. Since the three-coordinate measuring equipment does not require excessive external force to apply force to the cylinder body, there is no need for high-strength fixture-type tooling to achieve a stable and efficient positioning and fixing effect.

[0015] Auxiliary pillars are used to assist in supporting the cylinder from the inside of the cylinder, and the elliptical design can maximize the support while avoiding the positioning pillars to prevent interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the front assembly of a positioning tool for three-coordinate inspection of an engine cylinder block;

[0017] Figure 2 It is a schematic diagram of the back side of the assembly of a positioning tool for three-coordinate inspection of an engine cylinder block;

[0018] Figure 3 It is a schematic diagram of a positioning fixture for three-coordinate detection of an engine cylinder block;

[0019] Figure 4 It is a schematic diagram of a reference base plate of a positioning fixture used for three-coordinate detection of an engine cylinder block;

[0020] In the figure; 1, reference base plate, 2, tooling plate, 3, positioning support, 4, auxiliary support, 5, cylinder body, 6, locking bolt, 7, positioning pin. DETAILED DESCRIPTION

[0021] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0022] Reference base plate 1, tooling plate 2, positioning support 3, auxiliary support 4, cylinder body 5, locking bolt 6, positioning pin 7.

[0023] like Figure 1 , 2 , 3, 4 as shown;

[0024] This article proposes a positioning fixture for three-coordinate detection of an engine cylinder block 5, a cylinder block 5 is arranged above the positioning fixture, the positioning fixture comprises a reference base plate 1 and a fixture plate 2, the reference base plate 1 is a rectangular plate with high parallelism and flatness on both sides, the upper surface of the reference base plate 1 is provided with a fixture plate 2 by bolt fixing, the shape of the fixture plate 2 is a rectangular plate, the outer edge of the fixture plate 2 is snap-fitted and connected to the positioning pin 7 on the upper surface of the reference base plate 1, the upper surface of the fixture plate 2 is provided with a positioning pillar 3 in the form of an equilateral triangle, and the inverted space between the positioning pillars 3 is The triangle is provided with a bolt through hole, and an auxiliary support 4 is provided horizontally between the front sides of the positioning support 3. The positioning support 3 is in the shape of a cone-headed cylinder. The top cone of the positioning support 3 is plugged and connected with the connecting hole at the end of the cylinder body 5. The top support type of the auxiliary support is connected with the end face of the cylinder body 5. The upper surface of the reference base plate 1 is provided with a positioning pin 7 and a bolt hole. The center spacing of the outer side of the positioning pin 7 is the same as the spacing between the midpoints of the outer edges of the tooling plate 2. The inner side of the bolt hole is provided with a thread, and the bolt hole is connected to the tooling plate 2 through the fixing bolt and the bolt through hole of the revolution plate. The bottom surface of the reference base plate 1 is fixedly connected to the three-coordinate measuring device. The tooling plate 2 is a rectangular plate with an outer contour smaller than that of the reference base plate 1. The midpoints of the three edges of the tooling plate 2 are provided with positioning grooves. The shape of the positioning groove is semicircular. The diameter of the positioning groove is the same as the diameter of the positioning pin 7. The tooling plate 2 is connected to the positioning pin 7 by the positioning groove. The shape of the positioning pillar 3 is a vertical cylinder. The top of the positioning pillar 3 is provided with an equilateral parallel cone head. The top diameter of the cone head is smaller than the diameter of the connecting hole at the end of the cylinder body 5. The positioning The lower end of the support 3 is connected to the assembly plate, and the assembly plate is fixedly connected to the tooling plate 2. The auxiliary support 4 is in the shape of a vertical elliptical column. The auxiliary support 4 is symmetrically arranged below the inner edge of the cylinder body 5 with respect to the longitudinal center line of the cylinder body 5. The lower end of the auxiliary support 4 is connected to the assembly plate, and the assembly plate is fixedly connected to the tooling plate 2. The cylinder body 5 is a combined engine valve body. The bottom end of the cylinder body 5 is provided with an assembly flange edge, and the middle part of the assembly flange edge is equidistantly provided with connecting holes. The inner edges are equidistantly provided between the inner piston cylinders of the cylinder body 5, and the inner edge of the bottom end is flush with the bottom end of the cylinder body 5.

[0025] Implementation examples;

[0026] When in use, first fix the reference base plate 1 on the three-coordinate platform, tighten it with screws from the bottom, then match the positioning groove of the tooling plate 2 with the positioning pin 7 of the reference base plate 1, and finally use the locking bolt 6 to fix the connection to complete the installation of the tooling on the three-coordinate platform. Then, just place the end of the cylinder body 5 directly on the positioning pillar 3 and the auxiliary pillar 4 above the tooling plate 2 for positioning and fixing.

[0027] The measuring fixture is used to clamp and position the test cylinder 5 so that the measurement origin of each measured part is the same. Therefore, only the measurement program needs to be set, and the three-coordinate platform can complete the inspection of the parts according to the automatic program. After manually activating the automatic inspection program, the three-coordinate measuring device inspects the measured part according to the measurement instruction, and automatically arranges the measurement data on the file, and then extracts the measurement data for analysis and production of the inspection report. The entire inspection process is automatically completed, the inspection efficiency is high, and repetitive manual operations are avoided.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A positioning fixture for three-coordinate detection of an engine cylinder block, wherein a cylinder block is disposed above the positioning fixture, and wherein: The positioning tooling includes a reference base plate and a tooling plate. The reference base plate is a double-sided rectangular plate with high parallelism and flatness. The upper surface of the reference base plate is provided with a tooling plate by bolt fixing. The tooling plate is in the shape of a rectangular plate. The outer edge of the tooling plate is snap-fitted and connected to the positioning pins on the upper surface of the reference base plate. The upper surface of the tooling plate is provided with positioning pillars in the form of an equilateral triangle. Bolt through holes are provided in the form of an inverted triangle between the positioning pillars. Auxiliary pillars are horizontally provided between the front sides of the positioning pillars. The positioning pillars are in the shape of a conical cylinder. The top conical head of the positioning pillar is plug-connected to the connecting hole at the end of the cylinder body, and the top support of the auxiliary pillar is fitted and connected to the end face of the cylinder body.

2. The positioning fixture for three-coordinate detection of an engine cylinder block according to claim 1, characterized in that: The upper surface of the reference base plate is provided with positioning pins and bolt holes. The center spacing of the outer sides of the positioning pins is the same as the spacing between the midpoints of the outer edges of the tooling plate. The inner sides of the bolt holes are provided with threads. The bolt holes are connected to the tooling plate through fixing bolts and bolt through holes of the revolution plate. The bottom surface of the reference base plate is fixedly connected to the three-coordinate measuring device.

3. A positioning tool for three-coordinate detection of an engine cylinder according to claim 2, characterized in that: The tooling plate is a rectangular plate with an outer contour smaller than the reference base plate. Positioning grooves are provided at the midpoints of the three edges of the tooling plate. The shape of the positioning grooves is semicircular, and the diameter of the positioning grooves is the same as the diameter of the positioning pin. The tooling plate is connected to the positioning pin through the positioning grooves.

4. The positioning tool for three-coordinate detection of an engine cylinder block according to claim 1, characterized in that: The positioning pillar is in the shape of a vertical cylinder, and an equilateral parallel cone head is provided at the top of the positioning pillar. The top diameter of the cone head is smaller than the diameter of the connecting hole at the end of the cylinder body. The lower end of the positioning pillar is connected to the assembly plate, and the assembly plate is fixedly connected to the tooling plate.

5. The positioning fixture for three-coordinate detection of an engine cylinder block according to claim 1, characterized in that: The auxiliary support is in the shape of a vertical elliptical column, and is symmetrically arranged below the inner edge of the cylinder body with respect to the longitudinal midline of the cylinder body. The lower end of the auxiliary support is connected to the assembly plate, and the assembly plate is fixedly connected to the tooling plate.

6. The positioning tool for three-coordinate detection of an engine cylinder block according to claim 1, characterized in that: The cylinder body is a combined engine valve body, the bottom end of the cylinder body is provided with a mounting flange edge, the middle part of the mounting flange edge is equidistantly provided with connecting holes, the inner side of the cylinder body is equidistantly provided with inner edges between the piston cylinders, and the inner edge of the bottom end is flush with the bottom end of the cylinder body.

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