An installation device for machining and positioning the lower structure of a precombustion chamber

Abstract

The present invention provides an installation device for processing and positioning the lower structure of a pre-combustion chamber, which can not only ensure the processing accuracy of the inner cavity special-shaped curved surface, but also reduce the labor intensity and production cost of workers. It includes: a positioning cone, which includes a concave cone cavity and an upper outer ring, the center of the upper outer ring is provided with a concave cone cavity, and the cone cavity is shaped like a part of the outer shape of the lower structure of the pre-combustion chamber; a flange, which includes a flange body, a concave straight groove, the concave straight groove is provided on the front end surface of the flange body, and is a diameter-length groove, and the concave straight groove is arranged along the length direction of a plurality of first locking holes; a horizontal plate, which includes a horizontal plate body, a positioning hole, and a plurality of first positioning connection holes are arranged on one end surface of the horizontal plate in the thickness direction; and a plurality of pressure plates, the pressure plates include a vertical plate and a horizontal plate, the horizontal plate is provided with at least one second positioning hole, the first bolt passes through the second positioning hole, and the large head end of the first bolt is pressed and attached to the upper surface of the horizontal plate.

Description

Technical Field

[0001] The present invention relates to the technical field of manufacturing a lower structure of a pre-combustion chamber, and in particular to an installation device used for machining and positioning the lower structure of a pre-combustion chamber. Background Art

[0002] The raw material of the pre-combustion chamber's lower structure is one of the most difficult metal materials to machine. Its matrix is ​​austenite, which is prone to work hardening during machining, making chip removal difficult, with low thermal conductivity, severe cutting vibration, and contains hard carbide abrasive particles. The inner cavity of the pre-combustion chamber's lower structure is a complex, special-shaped surface, including an axial inclined hole tangent to the inner arc surface, a radial high-precision inclined hole, a spherical surface, and a tangent arc surface. In existing machining, the outer shape of the pre-combustion chamber's lower structure is completed before the inner cavity is machined. During the inner cavity machining operation, a soft three-jaw clamp is first used to clamp the outer circle of the part, and the rotary table is rotated by an angle. Then, a customized, special non-standard tool is used to machine the special-shaped surface of the inner cavity. This clamping and machining method can easily cause pre-loosening and scrapping of the part due to the high cutting force during the milling process with large cutting depth. Secondary clamping and adjustment are also required to complete the machining of the special-shaped surface, seriously affecting production progress and increasing production costs. Summary of the Invention

[0003] In response to the above problems, the present invention provides an installation device for processing and positioning the lower structure of the pre-combustion chamber, which can not only ensure the processing accuracy of the special-shaped curved surface of the inner cavity, but also reduce the labor intensity of workers and production costs.

[0004] A mounting device for machining and positioning a pre-combustion chamber lower structure, characterized in that it comprises:

[0005] The positioning cone includes a concave conical cavity and an upper outer ring. The center of the upper outer ring is provided with a concave conical cavity, and the conical cavity is shaped like a part of the outer shape of the lower structure of the pre-combustion chamber.

[0006] A flange, comprising a flange body and an inwardly concave straight groove, wherein the inwardly concave straight groove is provided on the front end surface of the flange body and is a groove having a diameter and a length, and the inwardly concave straight groove has a plurality of first locking holes arranged along the length direction;

[0007] A horizontal plate, comprising a horizontal plate body and positioning holes, wherein a plurality of first positioning connection holes are arranged on one end surface in the thickness direction of the horizontal plate;

[0008] and a plurality of pressing plates, the pressing plates comprising a vertical plate and a horizontal plate, the horizontal plate being provided with at least one second positioning hole, the first bolt passing through the second positioning hole, and the large end of the first bolt being pressed against the upper surface of the horizontal plate;

[0009] The upper outer ring is provided with a plurality of second locking holes extending therethrough, the positioning cone is positioned in the positioning holes, the lower surface of the upper outer ring is supported on the upper surface of the horizontal plate body, the horizontal plate body is provided with aligned threaded holes at positions corresponding to the second locking holes, and the second bolts are respectively fixedly connected through the locking holes and the aligned threaded holes;

[0010] One end of the horizontal plate is inserted into the concave straight groove and connected to the first locking hole and the first positioning connection hole through a fastening structure;

[0011] A plurality of flange positioning holes are arranged around the flange body, and the flange positioning holes are used for fixing the docking flange on the rotary workbench.

[0012] It is further characterized by:

[0013] The width of the inwardly concave straight groove is equal to the thickness of the transverse plate, and one end of the transverse plate is inserted into the inwardly concave straight groove to ensure the plane arrangement of the transverse plate;

[0014] The conical cavity is arranged in the shape of the lower convex conical surface of the pre-combustion chamber lower structure, ensuring that the outer shape positioning of the pre-combustion chamber lower structure is accurate and reliable;

[0015] The inner end of the horizontal plate is provided with a downward pressing end, the inner wall of the horizontal plate is an arc-shaped structure, and its direction is arranged toward the outer wall of the upper convex stop ring of the lower structure of the pre-combustion chamber, and the downward pressing end presses the upper stop ring surface of the lower structure of the pre-combustion chamber in a pressing state;

[0016] The upper outer ring is provided with second locking threaded holes at positions corresponding to the second positioning holes, and the bottom column end of the first bolt is threadedly inserted into the second locking threaded holes to ensure reliable pressing of the pressure plate to the lower structure of the pre-combustion chamber.

[0017] After adopting the present invention, the positioning cone, flange, cross plate, pressure plate and bolts are assembled, and then the flange is fixed on the flange of the rotary table of the machining center. Before processing, the large end face and the inner cone face of the positioning cone are adjusted to ensure that the runout is ≤0.02; then the entire structure together with the lower structure of the pre-combustion chamber whose outer shape is processed is pre-installed on the mounting device, and the inner cone face and the large end face are adjusted for the second time to ensure that the runout is ≤0.02; by utilizing the rotation angle of the rotary table, the complex inner cavity special-shaped surface processing of the lower structure of the pre-combustion chamber is completed at one time by customizing special non-standard tools; this processing method can not only well ensure the dimensional accuracy (including size, roughness, form and position tolerance) of the inner cavity special-shaped surface of the lower part of the pre-combustion chamber, but also reduce the labor intensity of workers and production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional diagram of the lower structure of the pre-combustion chamber;

[0019] Figure 2 It is a partial cutaway perspective view of the lower structure of the pre-combustion chamber;

[0020] Figure 3 A perspective view of the pre-combustion chamber lower structure installed in the present invention;

[0021] Figure 4 for Figure 3 A schematic diagram of a top view structure of FIG.

[0022] Figure 5 for Figure 4 AA cross-sectional structure diagram;

[0023] Figure 6 It is a front view of the flange of the present invention;

[0024] Figure 7 for Figure 6 Schematic diagram of the BB cross-sectional structure;

[0025] Figure 8 A top view of the horizontal plate of the present invention;

[0026] Figure 9 for Figure 8 Schematic diagram of the left view structure;

[0027] The names corresponding to the serial numbers in the figure are as follows:

[0028] Positioning cone 10, cone cavity 11, upper outer ring 12, second locking hole 121, second locking threaded hole 122, flange 20, flange body 21, flange positioning hole 211, inner concave straight groove 22, first locking hole 23, cross plate 30, cross plate body 31, alignment threaded hole 311, positioning hole 32, first positioning connection hole 33, pressure plate 40, vertical plate 41, horizontal plate 42, lower pressing end 421, arc structure 422, second positioning hole 43, pre-combustion chamber lower structure 50, lower convex conical surface 51, upper convex stop ring 52, upper stop ring surface 53, first bolt 60, second bolt 70. DETAILED DESCRIPTION

[0029] A mounting device for machining and positioning the lower structure of a pre-combustion chamber, see Figures 1-9 , which includes a positioning cone 10, a flange 20, a transverse plate 30, and a plurality of pressure plates 40;

[0030] The positioning cone 10 includes a concave conical cavity 11 and an upper outer ring 12. The center of the upper outer ring 12 is provided with a concave conical cavity 11. The conical cavity 11 is shaped like a part of the outer shape of the lower structure 50 of the pre-combustion chamber.

[0031] The flange 20 includes a flange body 21 and an inner concave straight groove 22. The inner concave straight groove 22 is provided on the front end surface of the flange body 21 and is a groove with a diameter and a length. The inner concave straight groove 22 has a plurality of first locking holes 23 arranged along the length direction.

[0032] The horizontal plate 30 includes a horizontal plate body 31 and positioning holes 32. A plurality of first positioning connection holes 33 are arranged on one end surface of the horizontal plate 30 in the thickness direction.

[0033] Each pressing plate 40 includes a vertical plate 41 and a horizontal plate 42. The horizontal plate 42 is provided with at least one second positioning hole 43. A first bolt 60 passes through the second positioning hole 43, and the large end of the first bolt 60 is pressed against the upper surface of the horizontal plate 42.

[0034] The upper outer ring 12 is provided with a plurality of second locking holes 121 extending therethrough. The positioning cone 10 is positioned in the positioning holes 32. The lower surface of the upper outer ring 12 is supported on the upper surface of the cross plate body 31. The cross plate body 31 is provided with alignment threaded holes 311 at positions corresponding to the second locking holes 121. The second bolts 70 are respectively fixedly connected through the second locking holes 121 and the alignment threaded holes 311.

[0035] One end of the horizontal plate 30 is inserted into the concave straight groove 22 and connected to the first locking hole 23 and the first positioning connection hole 33 through a fastening structure;

[0036] Four flange positioning holes 211 are evenly distributed on the flange body 21 , and the flange positioning holes 211 are used for fixing the docking flange on the rotary workbench.

[0037] The width of the concave straight groove 22 is equal to the thickness of the horizontal plate 30, and one end of the horizontal plate 30 is inserted into the concave straight groove 22 to ensure the plane arrangement of the horizontal plate;

[0038] The conical cavity 11 is arranged in the shape of the lower convex conical surface 51 of the pre-combustion chamber lower structure 50, ensuring that the outer shape positioning of the pre-combustion chamber lower structure 50 is accurate and reliable;

[0039] The inner end of the horizontal plate 42 is provided with a downward pressing end 421. The inner wall of the horizontal plate 42 is an arc-shaped structure 422, which is arranged in the direction of the outer wall of the upward convex stop ring 52 of the pre-combustion chamber lower structure 50. The downward pressing end 421 presses the upper stop ring surface 53 of the pre-combustion chamber lower structure 50 in the pressing state.

[0040] The upper outer ring 12 is provided with second locking threaded holes 122 at positions corresponding to the second positioning holes 43. The bottom column end of the first bolt 60 is threadedly inserted into the second locking threaded hole 122. The lower end of the vertical plate 41 is pressed onto the upper surface of the horizontal plate body 31 to ensure that the pressure plate 40 is reliably pressed onto the lower structure 50 of the pre-combustion chamber.

[0041] Its working principle is as follows: the positioning cone 10, flange 20, cross plate 30, pressure plate 40, and bolts are assembled, and then the flange 20 is fixed on the flange of the rotary table of the machining center. The large end face and inner cone runout of the positioning cone are adjusted before processing to ensure that the runout is ≤0.02; then the entire structure together with the pre-combustion chamber lower structure 50 whose outer shape is processed is pre-installed on the mounting device, and the inner cone and large end face runout are adjusted for a second time to ≤0.02; the rotation angle of the rotary table is utilized, and the complex inner cavity special-shaped surface processing of the pre-combustion chamber lower structure is completed at one time by customizing special non-standard tools; this processing method can not only well ensure the dimensional accuracy (including size, roughness, form and position tolerance) of the inner cavity special-shaped surface of the lower part of the pre-combustion chamber, but also reduce the labor intensity of workers and production costs.

[0042] The idea of ​​designing the installation device for processing and positioning the lower structure of the pre-combustion chamber is divided into the following key steps:

[0043] ① Design the locating cone: In the first step, the outer conical surface of the pre-large end is selected as the positioning reference. The main advantages are that the conical surface has the advantages of reliable positioning, high processing precision, easy disassembly and assembly, and the contact surface is not easily damaged. The conical surface is selected according to the national standard requirements. In the second step, the total thickness of the locating cone is determined. Since the pre-processing needs to be completed in one go, the total thickness of the locating cone must avoid the position of the pre-radial high-precision inclined hole. The final total thickness of the locating cone is determined by calculation. In the third step, the positioning outer circle, positioning surface size and behavioral tolerance requirements of the locating cone and the cross plate are determined according to the deformation amount. The position of the countersunk screw hole will be determined according to the situation later.

[0044] ② Design the cross plate: The first step is to determine the size and form and position tolerances of the positioning inner holes of the cross plate and the positioning cone, and select a transition fit. This is mainly because the transition fit has relatively small clearance and interference, high positioning accuracy, good centering and coaxiality between the hole and the axis, and a positioning connection that is easy to disassemble and assemble. The second step is to determine the total thickness of the cross plate. Since it needs to be completed in one go, the total thickness of the cross plate must avoid the position of the pre-radial high-precision inclined hole. The final total thickness of the positioning cone is determined based on calculations. Due to the high processing accuracy of the parts, the total thickness of the cross plate must strictly control the size and behavior tolerances to ensure that the subsequent installation and calibration accuracy meet the requirements. The size and position of the appearance and screw holes will be determined later based on the actual situation.

[0045] ③ Design the flange: The first step is to determine the maximum outer diameter of the flange, the outer circle size of the positioning reference, and the size and position of the four countersunk screw holes based on the outer diameter of the flange on the rotary table, the size of the positioning reference hole, and the size and position of the four connecting screw holes; the second step is to determine the position of the straight groove of the flange and the cross plate. For subsequent calibration, the cross plate calibration plane is designed to be at the position of the flange axis; the third step is to determine the size and form and position tolerance of the flange straight groove, and select the transition fit, mainly because the transition fit clearance and interference are relatively small, the positioning accuracy is high, and there is good centering and coaxiality between the hole and the axis, and it is easy to disassemble and assemble the positioning connection; the fourth step is to connect the flange and the cross plate, and use the hexagon socket screw on the flange to reversely pull and lock it, mainly because it is easy to tighten and disassemble, and can withstand greater loads and is not easy to slip. The size and position of the appearance will be determined according to the situation later;

[0046] ④ Design the pressure plate. In the first step, the dimensions of the lower part of the pre-combustion chamber and the positioning cone, cross plate, and flange are determined to be three-dimensionally assembled. The arc-shaped pressure plate is designed according to the shape and assembly height of the lower part of the pre-combustion chamber. The size is automatically adjusted according to the error to achieve the compression effect. The design of the arc-shaped pressure plate is mainly for better positioning. In the second step, according to the assembly requirements of the four key parts, the shape of the positioning cone and cross plate and the size and position of the countersunk screw holes and screw holes of each gear are determined to play the final connection and fixing role.

[0047] ⑤ The first verification of the lower part processing of the pre-combustion chamber, the first step is to assemble the installation device, pay attention to the assembly relationship and assembly requirements during assembly; the second step, fix the flange on the rotary table flange of the machining center, and adjust the large end face and inner cone runout of the positioning cone to ensure that the runout is ≤0.02; the third step is to pre-install it on the installation device, and adjust the inner cone and large end face runout for the second time to ≤0.02; the fourth step is to use the rotation angle of the rotary table to complete the processing of the complex inner cavity special-shaped curved surface at one time by customizing special non-standard tools.

[0048] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0049] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A mounting device for machining and positioning the lower structure of a pre-combustion chamber, characterized in that: It includes: The positioning cone includes a concave conical cavity and an upper outer ring. The center of the upper outer ring is provided with a concave conical cavity, and the conical cavity is shaped like a part of the outer shape of the lower structure of the pre-combustion chamber. A flange, comprising a flange body and an inwardly concave straight groove, wherein the inwardly concave straight groove is provided on the front end surface of the flange body and is a groove having a diameter and a length, and the inwardly concave straight groove has a plurality of first locking holes arranged along the length direction; A horizontal plate, comprising a horizontal plate body and positioning holes, wherein a plurality of first positioning connection holes are arranged on one end surface in the thickness direction of the horizontal plate; and a plurality of pressing plates, the pressing plates comprising a vertical plate and a horizontal plate, the horizontal plate being provided with at least one second positioning hole, the first bolt passing through the second positioning hole, and the large end of the first bolt being pressed against the upper surface of the horizontal plate; The upper outer ring is provided with a plurality of second locking holes extending therethrough, the positioning cone is positioned in the positioning holes, the lower surface of the upper outer ring is supported on the upper surface of the horizontal plate body, the horizontal plate body is provided with aligned threaded holes at positions corresponding to the second locking holes, and the second bolts are respectively fixedly connected through the locking holes and the aligned threaded holes; One end of the horizontal plate is inserted into the concave straight groove and connected to the first locking hole and the first positioning connection hole through a fastening structure; The flange body is provided with a plurality of flange positioning holes, which are used to fix the docking flange on the rotary workbench; The width of the inwardly concave straight groove is equal to the thickness of the transverse plate, and one end of the transverse plate is inserted into the inwardly concave straight groove; The conical cavity is arranged in the shape of a lower convex conical surface of the lower structure of the pre-combustion chamber.

2. The mounting device for machining and positioning the lower structure of a pre-combustion chamber according to claim 1, characterized in that: The inner end of the horizontal plate is provided with a downward pressing end, the inner wall of the horizontal plate is an arc-shaped structure, and its direction is arranged toward the outer wall of the upper convex stop ring of the lower structure of the pre-combustion chamber. The downward pressing end presses the upper stop ring surface of the lower structure of the pre-combustion chamber in a pressed state.

3. The mounting device for machining and positioning the lower structure of a pre-combustion chamber according to claim 1, characterized in that: The upper outer ring is provided with second locking threaded holes at positions corresponding to the second positioning holes, and the bottom column end of the first bolt is threadedly inserted into the second locking threaded holes.

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