Auxiliary positioning tool for turning flat end face of large-diameter star hole propellant grain

Abstract

The utility model discloses an auxiliary positioning tool for turning the flat end face of a large-diameter star hole propellant grain. The auxiliary positioning tool comprises a supporting rod and a star hole fixing mandrel. The supporting rod is a cylindrical supporting piece, and a connecting thread is machined on the outer wall of the rear end of the supporting rod. The front section of the star hole fixing mandrel is a supporting and positioning section of which the appearance is matched with the inner shape of a to-be-processed propellant grain star hole, and the rear section of the star hole fixing mandrel is a tip connecting section of which the diameter is smaller than the diameter of an inscribed circle of the to-be-processed propellant grain star hole; a threaded hole matched with the outer wall of the rear end of the supporting rod is formed in the center of the end face of the front end of the star hole fixing mandrel supporting and positioning section. The star hole fixing mandrel supporting and positioning section is inserted into the rear end of a to-be-machined propellant grain star hole, the supporting rod is inserted into the front end of the to-be-machined propellant grain star hole, and the rear end of the supporting rod is in threaded connection with the interior of a threaded hole in the front end of the star hole fixing mandrel supporting and positioning section.

Description

Technical Field

[0001] The utility model relates to an auxiliary positioning tool for turning a large-diameter star-hole propellant grain flat end surface, and belongs to the field of solid propellant turning. Background Art

[0002] In order to meet the requirements of the charge size, the two end faces, side faces or inner holes of the blank grain column need to be machined. The star-hole propellant carburettor process requires the use of auxiliary positioning tooling for positioning. The traditional flat end face auxiliary positioning tooling uses a cylindrical fixed mandrel to match a certain length of galvanized aluminum tube, which is placed in the star hole of the grain column after matching. The end of the grain column without a mandrel is clamped with a lathe three-claw clamp, and the tooling is pushed to make the internal galvanized aluminum tube press against the inner fixed plate of the lathe, and then the lathe tailstock top is shaken to press the cylindrical mandrel, and then the end face of the grain column is machined. After the carburettor is turned, there are different degrees of collapse and notches at the edges and corners of the inner hole of the end face of the grain column, which seriously affects the appearance quality of the product.

[0003] The currently used flat-end auxiliary tooling has poor matching between the tooling and the inner hole of the charge column during the charge loading process, which is prone to collision and friction, posing a safety risk. Utility Model Content

[0004] The purpose of the utility model is to solve the problems of obvious shaking of the grain, poor quality of the grain end surface, safety risks in the turning process, etc. when using traditional auxiliary tooling for flattening the end surface, and to provide an auxiliary positioning tooling for flattening the end surface of a large-diameter star-hole propellant grain.

[0005] The purpose of this utility model is achieved through the following technical solutions:

[0006] The utility model discloses an auxiliary positioning tool for flattening the end surface of a large-diameter star-hole propellant grain column, which comprises a support rod and a star-hole fixing core shaft.

[0007] The support rod is a cylindrical support member, the diameter of the support rod is smaller than the diameter of the inscribed circle of the propellant grain star hole to be processed, and the rear end outer wall of the support rod is processed with a connecting thread;

[0008] The front section of the star hole fixing mandrel is a supporting and positioning section whose outer shape matches the inner shape of the star hole of the propellant grain to be processed, and the rear section of the star hole fixing mandrel is a top connecting section whose diameter is smaller than the diameter of the inscribed circle of the star hole of the propellant grain to be processed; a threaded hole matching the outer wall of the rear end of the support rod is provided at the center of the front end face of the supporting and positioning section of the star hole fixing mandrel, and a top hole is provided at the center of the rear end face of the top connecting section of the star hole fixing mandrel;

[0009] The star hole fixing core shaft support positioning section is inserted into the rear end of the propellant charge star hole to be processed, the support rod is inserted into the front end of the propellant charge star hole to be processed, and the rear end of the support rod is threadedly connected to the threaded hole at the front end of the star hole fixing core shaft support positioning section.

[0010] Working process:

[0011] When turning the charge, install the propellant charge to be processed equipped with auxiliary positioning tooling on the lathe, use the lathe three-jaw clamp to clamp the left end of the support rod, and then use the lathe tailstock center to tightly press the center hole at the rear end of the star hole fixing core shaft center connecting section, and then the charge turning operation can be completed.

[0012] Beneficial effects:

[0013] The utility model discloses a star-hole propellant charge-turning auxiliary positioning device, which can better fit with the star hole of the charge column. When the charge is turned, the charge turning knife will not shake obviously when turning the edge of the end face, and the end face of the charge column will not have obvious collapse and notch, which not only ensures the quality of the end face after turning, but also improves the safety of the employees' operation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a diagram of the auxiliary positioning tooling of the utility model in use;

[0015] Figure 2 for Figure 1 AA view;

[0016] Figure 3 This is a schematic diagram of the structure of the support rod in the auxiliary positioning tooling of the utility model;

[0017] Figure 4 This is a structural schematic diagram of the star hole fixing mandrel in the auxiliary positioning tooling of the utility model;

[0018] In the figure, 1-support rod; 2-star hole fixing mandrel; 3-propellant grain to be processed. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0020] Example

[0021] like Figure 1 , 2 As shown, the utility model is a large-diameter star-hole propellant grain flattening end surface auxiliary positioning tool, which includes a support rod 1 and a star-hole fixing core shaft 2.

[0022] like Figure 3As shown, the support rod 1 is a cylindrical support member, the diameter of the support rod 1 is smaller than the diameter of the inscribed circle of the star hole of the propellant grain 3 to be processed, and the rear end outer wall of the support rod 1 is processed with a connecting thread;

[0023] like Figure 4 As shown, the front section of the star hole fixing mandrel 2 is a supporting and positioning section whose outer shape matches the inner shape of the star hole of the propellant grain 3 to be processed, and the rear section of the star hole fixing mandrel 2 is a top connecting section whose diameter is smaller than the diameter of the inscribed circle of the star hole of the propellant grain 3 to be processed; a threaded hole matching the outer wall of the rear end of the support rod 1 is provided at the center of the front end face of the supporting and positioning section of the star hole fixing mandrel 2, and a top hole is provided at the center of the rear end face of the top connecting section of the star hole fixing mandrel 2;

[0024] The support and positioning section of the star hole fixing core shaft 2 is inserted into the rear end of the star hole of the propellant charge 3 to be processed, and the support rod 1 is inserted into the front end of the star hole of the propellant charge 3 to be processed, and the rear end of the support rod 1 is threadedly connected to the threaded hole at the front end of the support and positioning section of the star hole fixing core shaft 2.

[0025] Working process:

[0026] When turning the charge, install the propellant charge 3 to be processed equipped with auxiliary positioning tooling on the lathe, use the lathe three-jaw clamp to clamp the left end of the support rod 1, and then use the lathe tailstock top to tightly press the top hole at the rear end of the top connecting section of the star hole fixing core shaft 2, and then the charge turning operation can be completed.

Claims

1. A large-diameter star-hole propellant grain flattening end surface auxiliary positioning tool, characterized by: It consists of a support rod and a star hole fixing mandrel; The support rod is a cylindrical support member, the diameter of the support rod is smaller than the diameter of the inscribed circle of the propellant grain star hole to be processed, and the rear end outer wall of the support rod is processed with a connecting thread; The front section of the star hole fixing mandrel is a supporting and positioning section whose outer shape matches the inner shape of the star hole of the propellant grain to be processed, and the rear section of the star hole fixing mandrel is a top connecting section whose diameter is smaller than the diameter of the inscribed circle of the star hole of the propellant grain to be processed; a threaded hole matching the outer wall of the rear end of the support rod is provided at the center of the front end face of the supporting and positioning section of the star hole fixing mandrel, and a top hole is provided at the center of the rear end face of the top connecting section of the star hole fixing mandrel; The star hole fixing core shaft support positioning section is inserted into the rear end of the propellant charge star hole to be processed, the support rod is inserted into the front end of the propellant charge star hole to be processed, and the rear end of the support rod is threadedly connected to the threaded hole at the front end of the star hole fixing core shaft support positioning section.

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