CN2282473Y

CN2282473Y - Numerically controlled camshaft milling machine

Info

Publication number: CN2282473Y
Application number: CN 95229615
Authority: CN
Inventors: 童尔清
Original assignee: JIANGXI MACHINE TOOLS PLANT
Current assignee: JIANGXI MACHINE TOOLS PLANT
Priority date: 1995-12-12
Filing date: 1995-12-12
Publication date: 1998-05-27
Anticipated expiration: 2005-12-12

Abstract

The utility model relates to a numerically controlled camshaft milling machine which is composed of a numerical control device, a machine body, a headstock, carriages, etc. Three stepping motors are respectively used for driving a main shaft, the carriages and a cutter frame. Cam contour shaping movement is produced by the linkage of the main shaft and the cutter frame. A milling head is fixed on a middle carriage, and the middle carriage is installed on a large carriage. A driving chain of the headstock is composed of a pair of worm gear pair with adjustable gaps. The middle part of a processed workpiece is provided with a hydraulic auxiliary supporting device of the workpiece. The utility model can complete the rough processing or the semi-finishing of the cam contour of various camshafts without the need of master forms.

Description

CNC-camshaft milling machine

The utility model relates to a kind of lathe that is exclusively used in the processing engine cam.

In the prior art, the mutual method that slightly adds of engine cam cam profile shape is roughly had two kinds: a kind of is to adopt camsahft coping lathe turning to add mutually, this device structure complexity, and efficient is low, the energy consumption height, volume is big, low precision, and need often to change pattern, and adjustment takes time-consuming mutually, and skill falls behind mutually.Another kind is to adopt numerically control grinder to carry out high-rate grinding, and this processing method requires height to the blank size precision of workpiece, and the equipment price costliness, increases production cost.

The purpose of this utility model provides a kind of dependence lathe general numerical control system and carries out numerical control control, do not need pattern, and simple in structure, volume is little, the efficient height can carry out slightly the adding mutually or the mutual CNC-camshaft milling machine of half finishing of camshaft profile of all kinds and shape.

The utility model is a basic part with the body of lathe bed on the basis of lathe, still keeps headstock, tailstock, three big parts such as planker, specifically by numerical control device, lathe bed, headstock, formation such as tailstock and planker is with three stepper motors difference drive shaft, planker and knife rests.Milling head is fixed on the middle carriage, and middle carriage is contained on the saddle.Carefully grow at the camshaft part, just shape is poor, and cutting easily produces the characteristics of flutter, and the utility model employing end mill almost is in interrupted cut work, the directly influence flutter of cutting of the gap of driving-chain, but so the utility model headstock driving-chain form by the worm gear in crack, a pair of gap.For improving the processing rigidity of camshaft, set up the hydraulic pressure auxiliary support apparatus at the medium position that is added mutual camshaft.The building motion of cam profile shape is produced by main shaft (Z axle) and knife rest (X-axis) interlock.A plurality of cams on the axle add mutually to be finished by saddle (Y-axis) lengthwise movement.

Because the cam profile shape of camshaft is an irregular curve, the cam profile shape of various dissimilar engines all has different tracks, and can't realize its track digitlization continuous control in the universal numerical control system.If develop special-purpose numerical control system, its significant limitation is arranged but: because the lid of various cam faces is other, special-purpose numerical control system is only effective to designed a certain camshaft, and a machine tool only fixedly adds mutual a kind of camshaft part, and obviously practical value is little.The interrupted straight line of the universal numerical control system that the utility model adopts is torn the control method of mending open, according to the cam lift track, be divided into the plurality of sections curve, every section curve replaces with spiral of Archimedes is approximate, these some helixes are coupled together, just form a theoretical lifting curve of approximate cam.Thereby the utility model automaticity height, do not need pattern, easy to adjust, highly versatile, with existing camsahft coping lathe relatively, it is little, in light weight to have a volume, it is low to consume energy, the efficient height, precision is good, and is simple in structure, advantages such as dependable performance.Its technical-economic index is compared as follows:

Fig. 1 is the utility model structural representation,

Fig. 2 is the A-A cutaway view of Fig. 1,

Fig. 3 is the utility model headstock worm gear structural representation,

Fig. 4 is the utility model clamping workpiece and aiding support hydraulic circuit schematic diagram.

The utility model is by numerical control device 14, lathe bed 1, and cabinet base 2, headstock 3, saddle 6, middle carriage 5 and tailstock 7 (are seen Fig. 1, formation such as Fig. 2).Milling head 4 is fixed on the middle carriage 5, is driven by a stepper motor and does laterally (X-axis) motion.Middle carriage 5 is contained on the saddle 6, and saddle 6 is driven by another stepper motor and does vertically (Y-axis) motion.Milling cutter is driven around self axis by alternating current generator and rotates.The headstock driving-chain is made of a pair of worm gear 10,11.As can be seen from Figure 3, worm screw 11 becomes one with main shaft, and eccentric support seat 12 is fixed in the headstock.Worm screw is connected by the inboard of bearing with the eccentric support seat.When worm gear 10 produces certain interval with worm screw 11 engagements, rotate the eccentric support seat, because eccentric support seat 12 relative its axial lines are eccentric, thereby can change the centre-to-centre spacing of worm gear and worm screw, to reach the purpose of eliminating the worm gear pairs gap.Main shaft is driven by the 3rd stepper motor and rotates.Saddle 6 adopts tilting structure, can improve its rigidity like this, is convenient to chip removal again, and is vertically increasing guiding length.Guide pass makes motion more become steady through laminating processing.Middle carriage is at width, and is more much bigger than general lathe on the length, helps increasing cutting stability.The milling head main shaft is directly by the V belt transmission, to reduce vibration and noise.Milling cutter directly is contained in the taper hole of milling head main shaft with No. 4 taper shanks of Mohs, and by drawing the pole anchorage.For reducing camshaft 9 in the flexural deformation that adds when mutual, be provided with the hydraulic pressure auxiliary support apparatus at the medium position that is added mutual camshaft, this device adopts two pairs or more hydraulic pressure constant force adjustable supports structure, each support cylinder piston area is identical, oil circuit communicates, each piston pressure equates, thereby the power of each strong point is impartial and adjustable.By the pressure switch in the hydraulic system, making each supporting force be transferred to cam only has till the micro-deformation after stressed.The clamping of part camshaft adopts hydraulic pressure to clamp automatically and unclamps mutually.When need clamp mutual part, the hydraulic pressure reversing solenoid valve ₁DT gets electric, main shaft chuck 13, and the top of tailstock 7 locked workpiece 9 and hold out against respectively.After hydraulic pressure raises, pressure switch YJ ₁Make ₁The DT dead electricity, ₃DT gets electric, and supplemental support 3 is moved and mutual part is propped up tightly.The big I of its supporting force is by YJ ₂Regulate.After pressure increases, pressure switch YJ ₂Make ₃The DT dead electricity, at this moment, part clamps to support and finishes mutually.When need unclamp mutual part, the hydraulic pressure reversing solenoid valve ₂DT, ₄DT simultaneously electric, main shaft chuck, tailstock center, supplemental support is unclamped simultaneously, and pressure switch YJ ₃Hydraulic pressure constantly raise, when hydraulic pressure is raised to certain value, YJ ₃Make ₂DT, ₄The DT dead electricity is unclamped mutual part, the program (see figure 4) that finishes.For avoiding the flutter district of stepper motor, machine tool transmission system has been taked the reduction of speed transmission.In the driving-chain of Z axle and X-axis, set up reducing gear.Main shaft, the gearratio of knife rest, saddle Wei Iz=1/40, Ix=2/15, Iy=3/5.

Claims

1, a kind of by numerical control device (14), lathe bed (1), headstock (3), tailstock (7), the CNC-camshaft milling machine that planker constitutes, it is characterized in that main shaft, middle carriage (5), saddle (6) drive with three stepper motors respectively, milling head (4) is fixed on the middle carriage (5), middle carriage (5) is contained on the saddle (6), and the headstock driving-chain is made up of the worm gear (10,11) of a pair of adjustable gaps, is provided with hydraulic pressure auxiliary support apparatus (8) at the medium position that is added mutual camshaft.

2. milling machine according to claim 1 is characterized in that saddle (6) adopts tilting structure, is vertically increasing guiding length, and the milling head main shaft is directly by the V belt transmission.

3. milling machine according to claim 1 and 2 is characterized in that hydraulic pressure auxiliary support apparatus (8) adopts two pairs or more hydraulic pressure constant force adjustable supports structure, and each support cylinder area equates that oil circuit communicates.

4, milling machine according to claim 3 is characterized in that the gearratio (iz) of main shaft is 1/40, and the gearratio of knife rest (ix) is 2/15, and the gearratio of saddle (iy) is 3/5.