阅读说明：本技术 一种涡轮增压器叶轮的免干涉定向铣削方法 (Interference-free directional milling method for turbocharger impeller ) 是由 邹含青 鲁建于 袁列军 吴�琳 赵倩 罗攀 孙浩鹏 邓欣 赵举坤 于 2020-12-18 设计创作，主要内容包括：本发明公开了一种涡轮增压器叶轮的免干涉定向铣削方法,可以防止刀具与叶片发生干涉。一种涡轮增压器叶轮的免干涉定向铣削方法,叶轮叶片上层开粗,采用直柄立铣刀,用直柄立铣刀的实际规格设置走刀程序,用定轴铣的方式对叶轮叶片上层进行开粗；叶轮叶片下层开粗,采用直柄立铣刀,建立一个带锥度的虚拟刀具,虚拟刀具的刀头直径与实际直柄立铣刀的刀头直径相等,并通过虚拟刀具的规格设置走刀程序,用定轴铣的方式对叶轮叶片下层进行开粗,直柄立铣刀实际走刀过程中,直柄立铣刀成梯度从外往内铣削,且铣削区域逐渐减小,使直柄立铣刀在向内铣削的过程中,与叶轮叶片完全无干涉。(The invention discloses an interference-free directional milling method for a turbocharger impeller, which can prevent a cutter from interfering with a blade. An interference-free directional milling method for a turbocharger impeller is characterized in that the upper layer of an impeller blade is roughened, a straight shank end mill is adopted, a feed program is set according to the actual specification of the straight shank end mill, and the upper layer of the impeller blade is roughened in a fixed-axis milling mode; the lower layer of the impeller blade is roughened, a straight shank end mill is adopted to establish a tapered virtual cutter, the diameter of a cutter head of the virtual cutter is equal to that of a cutter head of an actual straight shank end mill, a feed program is set according to the specification of the virtual cutter, the lower layer of the impeller blade is roughened in a fixed-axis milling mode, the straight shank end mill is milled from outside to inside in a gradient mode in the actual feed process of the straight shank end mill, the milling area is gradually reduced, and the straight shank end mill and the impeller blade are completely free of interference in the inward milling process.)

1. An interference-free directional milling method for a turbocharger impeller is characterized by comprising the following steps:

the upper layer of the impeller blade is rough

Adopting a straight shank end mill, setting a feed program according to the actual specification of the straight shank end mill, and roughing the upper layer of the impeller blade in a fixed-axis milling mode;

the lower layer of the impeller blade is opened roughly

The method comprises the steps of establishing a virtual cutter with taper by adopting a straight shank end mill, setting a feed program according to the specification of the virtual cutter, roughing the lower layer of an impeller blade in a fixed-axis milling mode, milling the straight shank end mill from outside to inside in a gradient manner in the actual feed process of the straight shank end mill, and gradually reducing a milling area so that the straight shank end mill has no interference with the impeller blade completely in the inward milling process.

2. The interference-free directional milling method of the turbocharger impeller according to claim 1, characterized in that: the taper of the virtual cutter is 0.5-2 degrees.

3. The interference-free directional milling method of the turbocharger impeller according to claim 2, characterized in that: the taper of the virtual cutter is 1 degree.

Technical Field

The invention relates to the technical field of turbochargers, in particular to an interference-free directional milling method for a turbocharger impeller.

Background

The impeller is used as a key part of power machinery and is widely applied to the field of aerospace. As can be seen from the geometric structure and the technological process of the impeller, the constraint conditions of the processing track planning are more when the integral impeller is processed, and the space between adjacent blades is smaller.

At present, in the industry, a widely-applied directional roughing method is adopted, an inward concave tool path is generated in the generation process of a lower tool path, the plane concave amount of the tool path is between 0 and 0.2mm, although the concave amount is small, collision interference between an upper tool bar and an upper processed blank can be caused if the concave amount is not adjusted in the physical processing, namely, part of a tool interferes with part of a workpiece due to the error of the tool path and the too narrow feeding space, and meanwhile, the interference cannot be effectively solved under the conventional function of software due to the small plane concave amount, so that a processing method for generating the interference-free tool path is needed.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides an interference-free directional milling method for a turbocharger impeller, which can prevent a cutter from interfering with a blade.

The purpose of the invention is realized as follows:

an interference-free directional milling method for a turbocharger impeller,

the upper layer of the impeller blade is rough

Adopting a straight shank end mill, setting a feed program according to the actual specification of the straight shank end mill, and roughing the upper layer of the impeller blade in a fixed-axis milling mode;

the lower layer of the impeller blade is opened roughly

The method comprises the steps of establishing a virtual cutter with taper by adopting a straight shank end mill, setting a feed program according to the specification of the virtual cutter, roughing the lower layer of an impeller blade in a fixed-axis milling mode, milling the straight shank end mill from outside to inside in a gradient manner in the actual feed process of the straight shank end mill, and gradually reducing a milling area so that the straight shank end mill has no interference with the impeller blade completely in the inward milling process.

Preferably, the taper of the virtual cutter is 0.5 to 2 degrees.

Preferably, the taper of the virtual cutter is 1 degree.

Due to the adoption of the technical scheme, the tool path track of the invention is gradually retracted inwards, so that the collision between the tool and the blade is avoided. And the straight shank end mill is used in the actual machining process, so that the problem of collision interference between the cutter and the upper-layer machined blank is solved.

Drawings

FIG. 1 is a schematic drawing of a roughing trajectory of a D25 straight shank end mill;

FIG. 2 is a schematic view of a D25 straight shank end mill;

FIG. 3 is a schematic structural view of a D25 virtual cutter (taper 1 degree);

FIG. 4 is a schematic diagram of a virtual tool rough path.

Detailed Description

Examples

The method comprises the steps of roughing the blades in a fixed shaft mode, building a virtual cutter with taper (1 degree) when the lower layer of the blades is roughened by using a straight shank end mill, calculating by software, and generating a program, wherein the generated cutter path track is gradually retracted inwards, so that the cutter and the blades are prevented from colliding. And the straight shank end mill is used in the actual machining process, so that the problem of collision interference between the cutter and the upper-layer machined blank is solved.

When the cutter is opened coarsely in a directional mode, the cutter interference problem of the end mill is avoided by increasing the taper of the cutter and establishing a virtual cutter. For example: the impeller is coarsened by a straight shank end mill (figure 2) of D25, and a cutter path track generated by software calculation is uniform and milled inwards as shown in figure 1, no gradient exists, and a cutter collides with a blade. Establishing a virtual cutter (figure 3) with 1-degree taper (single side) by using the end mill of D25, and generating a program track by using the virtual cutter, wherein the track is milled inwards in a gradient manner as shown in figure 4, the milling area is smaller the further the track is, and the cutter and the blade have no interference.

Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims.