管夹典型零件连续模具设计

根据管夹典型零件的结构特点,围绕保证产品质量、提高生产效率、降低生产劳动强度,设计了一副使压字、冲裁、压弯、压筋、胀形于一体的连续模具.首先由压弯凸模与顶料板配合将条料压紧拖入压弯凹模型腔内,带动后面的条料前移,然后再将条料切断分离,保证了自动送料的顺畅.利用楔块装置把成形后的零件从模具侧面推出,使管夹零件实现了全自动...     

解决级进模送料中尾端下垂问题的机构设计

介绍了级进模运行过程中板料在落料或脱离模具过程中端部下垂而导致整个生产过程出现送料不顺或卡料的问题,设计了斜楔滑块结构装置,确保成形零件在送料过程中的平稳,保证了料片切断后流出的顺畅性和冲裁的精确性,提高了模具连续生产的效率。     

一种新型自动接料装置在全机能数控车床上的设计与应用

针对用户使用全机能数控车床在进行多品种、多批次加工小轴零件时存在的问题,设计了一种新型自动接料装置,构建了该装置的整体结构,实现了接料装置、收集装置的设计,并分析了设计过程中注意的问题。经用户使用,该新型装置在提高劳动生产率、提高产品质量、降低劳动强度等方面具有积极意义。     

冲压自动送料装置

为了改善冲压产品质量、降低成本、提高劳动生产率,制造了通用式自动送料装置(图1),使落料冲模全自动化。如我厂生产的一种弹簧片,采用此自动送料装置后,由原来三道工序改为一道完成,提高生产效率三倍。     

钢管加厚机送料装置的改进

将钢管加厚机原送料装置改为拉杆式送料装置,使其结构简单,辅助动作少,生产效率高,设备运行可靠,提高了钢管的加工精度。     

钢管气密试验台及自动上下料机构

在生产过程中对焊管进行气密检测是保证产品质量的重要手段。论述了钢管气密试验台及自动上下料装置的主要组成、功能等。该检测系统性能稳定,操作简便,能有效提高检测的自动化水平,降低操作工人的劳动强度。现场实际检测证明,该系统设计合理且性能可靠。     

夹料翻边对前门外板窗框回弹控制的探讨

以某车型前门外板为例,说明夹料翻边在前门外板窗框区域的应用,翻边模增加夹料翻边结构后,通过控制翻边过程中的翻边力大小控制窗框区域的回弹,以提高零件成形质量及包边总成质量。     

浅谈锥台空心件的成形

<正> 我院生产的长江750摩托车排气管原采用振动剪下料,手工敲打圆锥台空心件。这种方法效率低,劳动强度大,产品质量难以保证。图1所示为摩托车排气管的锥台空心件,材料为10~*钢板,厚1毫米。为了提高产品质量,我们设计了一副落料模和一副弯曲成形模,使生产效率由原来的日产20件骤升到2000件。     

40Cr钢套管料生产工艺改进

穿孔-减径法生产40Cr钢钎具套管料生产工艺与原穿孔直接生产套管料工艺相比。穿孔-减径法生产成本低,产品质量好,成材率高。     

超硬材料烧结体混料装置设计与应用

制造超硬材料烧结体是重要的一个环节性就是混料,本文详细的阐述了混料装置的设计及其在生产过程中的应用,其优越性在于稳定产品质量,降低生产成本,提高劳动生产率。     

A practical method of modelling and simulation for drill fluting

A grinding wheel profile for drill fluting is usually designed by the indirect method, defining the wheel profile by the desired drill flute. This paper presents an adaptive and intuitive direct method for drill flute modelling. It is summarized as follows: the grinding wheel, with analytically defined profile, is assumed to be moving helically around the stationary drill; the flute is generated by the overlapping part between the wheel locus and the workpiece. Its validity is verified by good agreement between the results computed and the data measured on the samples manufactured.     

A five axis computer controlled twist drill grinder

A new type of drill grinding machine controlled by a microprocessor has been designed. This machine has five computer controlled axes, each axis is driven by a DC servo motor. Three of the axes are rotary allowing the drill to take up any orientation in space. Two are translations allowing the grinding wheel to approach the drill point no matter where it is. Contouring software makes it possible to produce the necessary features on the drill point utilizing this positional flexability. For example, a racon point which has a round flank, a helical point which has a raised tip or web thinning and point splitting can be produced. Drills in the range of 0.375 in. (9.5 mm) to 1.5 in. (38.1 mm) dia. and in the length range of 7 to 15 in. (180 to 375 mm) can be ground. A sensor finds the location of the drill flute so the microcomputer can automatically orient the flute and cutting edge.     

Computer analysis of drill point geometry

The difficulties in drill point geometry analysis are aggravated by the process of drill point design which now includes the hyperboloidal drill and ellipsoidal drill. This paper provides a tool based upon mathematical models for drill point and drill flute geometries which enables drill point geometry to be analyzed accurately and conveniently by computer. The explicit equations for the drill flank contour and the drill angles are derived and shown to be directly calculated from the grinding parameters. This methodology also enables one to calculate the shapes of cutting edges and chisel edges and their relationships with the grinding parameters. A flute contour is designed for the ellipsoidal drill to improve the excessive inclination angles of cutting edges near outside corners. The chisel edge shape is defined so that it can be measured quantitatively as well as qualitatively.     

Mathematical model for helical drill point

Helical drill points provide a superior cutting performance in drilling operations, particularly in micro-hole drilling. This paper presents a comprehensive and straightforward method for the design of helical drill points. The proposed method has three particular features. Firstly, a mathematical model of the helicoid grinding surface is developed. This model allows the normal and tangential vectors of the abrasive wheel to be obtained explicitly. Secondly, the mathematical models of the flute and flank surfaces are integrated and therefore the cutting and chisel edges can be obtained by numerical calculation. Finally, the derivation of the model is straightforward and expresses the drill's characteristics (e.g. the semi-point angle, chisel edge, lip clearance angle, heel clearance, angle tool cutting edge inclination, normal rake angle and normal clearance angle) in accordance with all current international standards. The proposed model is capable of describing a wide range of helical drills. The methodology presented in this study facilitates the production of helical drills on a 6-axis CNC grinding machine.     

Development of freeform grinding methods for complex drill flank surfaces and cutting edge contours

This paper details the development of an innovative freeform grinding method that enables the generation of complex drill flank surfaces and cutting edge contours that are non-quadratic model based. This method allows a direct and independent design of drill cutting angle distributions—normal rake angle (γ_n) and relief angle (α_f). Mathematical formulations were first developed for γ_n and α_f in terms of drill geometric parameters such as helix angle, flute contour, and cutting edge contour. The developed freeform grinding methods enhance the flexibility of the grinding process by enabling the production of drills with convex and concave flank surfaces and complex cutting edge contours with standard wheel sets, eliminating the need to manufacture specially designed form grinding wheels.     

Automatic search for wheel position in flute grinding of cutting tools

The profile of helical flutes has a great influence on properties of cutting tools. This paper presents an automatic method of searching for a wheel position in flute grinding for a given shape of the helical flute and grinding wheel profile. The algorithm is based on the main loop and two subroutines. The first algorithm is dedicated to the simulation of the flute profile by splitting the grinding wheel into many thin disks. The second algorithm represents the numerical evaluation of the reached profile that results from previous grinding simulation. Finally, the experimental evaluation using particle swarm optimization is presented and obtained results discussed.     

Drill flank measurement and flank/flute intersection determination

Twist drill is a cutting tool of large-batch and diversified varieties. Geometric measurement is indispensable to drill design, manufacture, and regrinding. To meet the demand of advance in manufacturing technology, a three-dimensional (3-D) drill measurement instrument was developed. Method of drill flank and flute measurement by using this device is presented in this work. Cutting angles evaluation is essential to cutting performance appraisal. But, there is no suitable instrument yet to inspect them directly. If the flank/flute intersection is determined, cutting angles calculation would be a routine work of numerical computation. Considering the peculiarity of the drill point configuration, a straightforward method for flank/flute intersection is derived. Procedure of cutting angles calculation is also detailed. The procedure is illustrated by an example of flank and flute inspection, flank/flute intersection, and cutting angles calculation for a standard twist drill. The measurement precision is appraised by using a tool-room microscopy. The maximum error is in the third decimal place. It verifies the validity of the developed 3-D drill meter and the proposed measurement methods.     

应用标准砂轮加工刀具螺旋槽的特征线研究

标准砂轮在刀具磨削的应用广泛。论文提出了由砂轮特征线求取刀具螺旋槽的方法。通过求取砂轮的各个曲面的特征线，根据砂轮的运动建立投影方程，进而求取各特征线在刀具端截面上的投影得到刀具的端截型。并建立螺旋槽端截型的描述方式，在此基础上通过仿真及在6UPS并联刀具磨床进行实验．对由特征线法得到的螺旋槽参数加以验证。     

Some aspects of twist drill design

A mathematical approach to the flute disposal capacity based on the diameter of the circle which could be inscribed in the flute space is presented. It is important to know what order of drill rigidity is required for good performance when drilling various work materials. The main features of the cross-section profile which could affect the stiffness of a twist drill are the cross-sectional area and the second moment of area. The relationship between the various drill parameters and these features is one aspect to be investigated in this paper. Empirical equations based on the results obtained from this investigation are presented.     

Mathematical model of multiflute drill point

Multiflute drilling is an efficient means of making high accuracy holes without reaming. Because of the current lack of a comprehensive mathematical model for this kind of drilling, this paper presents a complete and simple method for designing multiflute drills. There are three special features of the proposed model. The first is that rotational axial-type cutting tools and disk-type abrasive wheels are modeled by revolution geometry, so that the normals and tangent vectors of flute and flank surfaces can be obtained explicitly. Consequently, rake and clearance angles of cutting and chisel edges can be investigated according to recommended ISO standards. The second feature is that the mathematical models of flute and flank surfaces are integrated, so that cutting and chisel edges and their various characteristic angles can be obtained by numerical calculation. Finally, a simple way to determine the rake angles and wedge angles and clearance angles is presented by using the unit normals of the ISO-recommended reference planes. To verify the validity of this methodology, a designed three-fluted drill was machined on a 6-axis tool-grinding machine. This model is comprehensive, simple, easy to use, and capable of describing a wide range of drill design features.