CN109857065B

CN109857065B - Large-scale mold deep cavity roughing method and application

Info

Publication number: CN109857065B
Application number: CN201910124196.8A
Authority: CN
Inventors: 李�杰; 袁建强; 邱天亮; 胡智清
Original assignee: Tianjin Silver Basis Technology Co ltd
Current assignee: Tianjin Silver Basis Technology Co ltd
Priority date: 2019-02-18
Filing date: 2019-02-18
Publication date: 2021-11-19
Anticipated expiration: 2039-02-18
Also published as: CN109857065A

Abstract

The invention discloses a large-scale mould deep cavity roughing method and application, wherein the large-scale mould deep cavity roughing method comprises the following steps of 1) establishing a blank model according to the mapping size; 2) establishing an interface at least at two ends of a cavity of a mold in the mold; 3) fixing the die blank, and then machining the outer part of the interface by using a short cutter to perform front roughing; 4) and (4) machining the inner part of the interface by adopting a lengthened cutter or a swing angle and finishing roughing. According to the invention, the boundary surface is firstly determined according to the length of the short cutter and the size of the main shaft and the enough safety distance. The interface is the area for shielding the interference of the short cutter, the shielded area is finally rotated by a proper angle and then machined by the short cutter, or the shielded area is directly machined by the long cutter, wherein the setting of the interface is that the outer part of the interface has the machining amount of at least 60 percent.

Description

Large-scale mold deep cavity roughing method and application

Technical Field

The invention belongs to the technical field of die machining, and particularly relates to a deep cavity roughing method for a large die and application thereof.

Background

Large-scale mould, like the mould of making the bumper, the mould is dark big and inner structure is complicated, when carrying out rough machining (from the blank operation of opening roughly promptly), the deep position of lateral wall adopts the angle of gyration processing, the angle of gyration processing can be processed with shorter cutter, the cutter is shorter more, the rigidity is better, machining efficiency is higher, be difficult to produce in the course of working because of the change of cutting load brings the cutter vibrations and cause quality factor such as bullet sword, overcut, but the angle of gyration processing has following several technical difficulties:

1. because the mold cavity is deep, the spindle head needs to go deep into the cavity, and the risk of collision between the spindle head and the mold exists;

2. after the angle is padded, one end of the right side mold is far away from the spindle head and the beam, the left side of the other end of the right side mold is close to the spindle head and the beam, and the risk of collision between the mold and the beam exists. After the machining is finished, the left interference area is machined by additionally arranging the angle of the left interference area after the die is disassembled and rotated by 180 degrees, so that the machining efficiency is low and the risk is high;

3. after the die rotates, the whole die becomes long, and one corner of the die has the risk of colliding with a machine tool cover.

4. The factors to be considered during programming are many, in order to prevent the die from colliding with the cross beam, the placing position of the die must be considered, the die is generally rotated by 15 degrees for processing, the factor of the Z-axis stroke is fully considered during programming, the programming difficulty is high, and accidents are easily caused by programming errors.

The other processing technology is that a mould is horizontally placed, the whole mould depth is divided into a plurality of areas according to different heights, then cutters with different lengths are used for processing, the deep cavity area at the bottom is processed by a long cutter, and the longer the cutter is, the poorer the rigidity is, the poorer the processing quality is; the longer the cutter is, the cut depth and the step pitch of each layer are reduced, the lower the processing efficiency is, one rough cutting operation can be finished only by about ten days, the efficiency is low, the risk is high, and the programming easily causes quality problems such as cutter bouncing, over-cutting and the like

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a large-scale die deep cavity roughing method which effectively improves the processing efficiency.

The invention is realized by the following technical scheme:

a method for opening a large-scale mold deep cavity comprises the following steps,

1) establishing a blank model according to the mapping size;

2) establishing an interface at least at two ends of a cavity of a mold in the mold;

3) fixing the die blank, and then machining the outer part of the interface by using a short cutter to perform front roughing;

4) and (4) machining the inner part of the interface by adopting a lengthened cutter or a swing angle and finishing roughing.

In the technical scheme, the outer part of the interface has the processing amount of at least 60 percent.

In the technical scheme, the interface is determined according to the length of the short cutter and the size of the main shaft and the enough safety distance.

In the technical scheme, the side walls of the front side and the rear side of the die cavity are provided with the interfaces.

In the technical scheme, the step 1) is to make a blank in UG according to mapping and then pour the blank into POWERMILL

And (5) making a triangular blank.

In the above technical solution, in the step 4), the residual model is generated by the program with the rough front surface, and the residual model is referenced to perform the swing angle rough opening or the long tool rough opening with a margin of 2-3MM more than the rough front surface.

In the technical scheme, the die blank is fixed on a horizontal machining center workbench.

In the above technical solution, before the step 3), a step of finishing the reference surface at an unimportant position outside the mold is further included.

An application of a deep cavity thickening method of a large-scale mold in a bumper mold.

The invention has the advantages and beneficial effects that:

according to the invention, the boundary surface is firstly determined according to the length of the short cutter and the size of the main shaft and the enough safety distance. The interface is the area for shielding the interference of the short cutter, the shielded area is finally rotated by a proper angle and then machined by the short cutter, or the shielded area is directly machined by the long cutter, wherein the setting of the interface is that the outer part of the interface has the machining amount of at least 60 percent. Preferably, the machining amount is more than 70%, half of the machining amount in the first step is realized by matching short cutters, and the whole machining efficiency is improved.

Detailed Description

In order to make the technical solution of the present invention better understood, the technical solution of the present invention is further described below with reference to specific examples.

Example one

1) establishing a blank model according to the mapping size;

2) establishing an interface at least at the two ends of the cavity of the mould in the mould, said interface being intended to shield areas of possible interference during subsequent machining of the short tool,

Of course, for interference areas on the front and rear sides of the mold cavity, it is equally possible to provide the parting plane on the side walls of said front and rear sides of the mold cavity.

Example two

Taking the rough opening of the bumper mold as an example, the processing steps include the following,

1. preparing a blank in UG according to mapping, and pouring POWERMILL to prepare a triangular blank;

2. designing a short cutter using a cutter 5 times the cutter length, and designing an interface to enable the outer part of the interface to contain 75% of machining amount; if the interface shields the region below 450mm and where there is interference with the short blade or spindle,

3. finely processing reference surfaces at non-important positions outside the die, wherein the reference surfaces are two vertical surfaces; the rear workpiece is rotated to be used as a reference for taking numbers, namely, a reference surface is determined according to a subsequent angle needing to be rotated, a mould is horizontally fixed on a worktable of the bucket mountain horizontal machining center, 75 percent of the front surface of the rough material is rough by using a short knife with the length 5 times that of the knife,

4. the part below the interface, i.e. the part contained in the inner part, is finished by adopting an elongated cutter, specifically, a residual model is generated by a program of thickening the front surface, the swinging angle thickening or the thickening of the elongated cutter is carried out by referring to the residual model, and the allowance is 2-3MM more than that of the thickening of the front surface. Because the peripheral hexahedron may be uneven when the mold is opened roughly, errors must be generated by twice mold erecting.

Of course, the die can be heightened according to the setting by utilizing the characteristic that the worktable of the machine tool can swing, and the deep-cavity bumper can be easily machined by using a shorter cutter in the area of the long cutter blocked by the auxiliary surface.

According to the embodiment, the machining advantage that the bucket-mountain horizontal machining center workbench can rotate and swing the angle is fully utilized, the steep area influencing the cutter length is blocked by the auxiliary surface, the main shaft head can extend into the cavity, the deep-cavity bumper is machined by using the short cutter, the rough machining of the bumper is determined after a square material bumper is roughly cut in 10 days originally for 5-6 days, and the efficiency is half fast enough. The most immediate minimum saving of 5 days of processing time on a single bumper die is 100 x 24 x 5 to 12000 dollars.

EXAMPLE III

The application of the method for roughing the deep cavity of the large-scale die in the bumper die can be understood that the large-scale die can be widely applied to machining of various deep cavity regions, machining conditions are used for limiting machining rhythm division, machining workload of the first step is fully considered, overall machining efficiency is effectively improved, application of long cutters is reduced, basic precision of roughing is guaranteed, and over-cutting and other conditions are avoided.

Moreover, relational terms such as "first" and "second," and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.

The invention has been described in an illustrative manner, and it is to be understood that any simple variations, modifications or other equivalent changes which can be made by one skilled in the art without departing from the spirit of the invention fall within the scope of the invention.

Claims

1. A method for roughing a deep cavity of a large-scale die is characterized by comprising the following steps: comprises the following steps of (a) carrying out,

1) establishing a blank model according to the mapping size;

2) establishing an interface at least at two ends of a die cavity of the die in the die to shield a region interfered by the short knife, wherein the outer part of the interface has a processing amount of more than 60%;

3) fixing a die blank, and then machining the outer part of the interface by using a short cutter to perform front roughing, wherein the die blank is fixed on a horizontal machining center workbench;

4) and machining the inner part of the interface by using a lengthened cutter or a swing angle and then using a short cutter to finish roughing.

2. The large-scale mold deep cavity roughing method according to claim 1, characterized in that: the interface is determined according to the length of the short cutter, the size of the main shaft and the enough safety distance.

3. The large-scale mold deep cavity roughing method according to claim 1, characterized in that: and interface surfaces are arranged on the side walls of the front side and the rear side of the die cavity.

4. The large-scale mold deep cavity roughing method according to claim 1, characterized in that: the step 1) is to make a blank in UG according to mapping and then pour POWERMILL to make a triangular blank.

5. The large-scale mold deep cavity roughing method according to claim 1, characterized in that: in the step 4), the program with the rough front surface is used for generating a residual model, and the residual model is referenced to perform angle-swinging rough opening or long cutter rough opening, and the allowance is 2-3MM larger than that of the rough front surface.

6. The large-scale mold deep cavity roughing method according to claim 1, characterized in that: the step of finishing the datum plane at the non-important position outside the mould is also included before the step 3).

7. Use of a large mould deep cavity roughening method according to claims 1-6 in a bumper mould.