CN201020484Y

CN201020484Y - Precision forming die for deep hole inner spline

Info

Publication number: CN201020484Y
Application number: CNU2007200899361U
Authority: CN
Inventors: 孟令先; 宋学进; 张元国
Original assignee: Zhengzhou Research Institute of Mechanical Engineering Co Ltd
Current assignee: Zhengzhou Research Institute of Mechanical Engineering Co Ltd
Priority date: 2007-04-09
Filing date: 2007-04-09
Publication date: 2008-02-13
Anticipated expiration: 2017-04-09

Abstract

A deep hole inner spline precise molding mould, an up assembled protruding mould of the mould comprises a protruding mould fixed cover which is fixed on the underside of the template, a protruding mold cover which is equipped in the protruding mould fixed cover through a protruding mould fixed lap, a protruding mould whose top end is combined with the protruding mould fixed cover through surplus way, a spline core rod is equipped under the protruding mould through the contacting copulate way; a lower combined concave mould of the mould and a work piece goring device are fixed installed on the top of a central hole of the underside template through concave mould cylinder, and work piece goring device includes a mat block which is equipped with a long goring rod is located in the central hole of the underside template, a mat block which is equipped with a goring rod is ordinal located in the central axis hole of concave mould cylinder from the top to the bottom and a mat board whose central axis hole is equipped with a goring ring; the lower combined concave mould includes a concave mould which is covering equipped together by a conical structure, a middle concave mould and a jacket of concave mould, and the lower combined concave mould is fixed equipped in the concave mould cylinder which is located on the mat board through concave mould fastening lap.

Description

The deep hole internal spline precise forming mold

Technical field

The utility model relates to the forging and pressing processing mold, is specially adapted to the deep hole internal spline precise forming mold of the big deep hole workpiece of deep hole processing internal spline and ratio of height to diameter.

Technical background

At present, such deep hole internal spline part is formed in the bottleneck that forges and presses manufacture field usually because of ratio of height to diameter (H/D) 〉=2.5.Hole ratio of height to diameter (height/diameter) is big, grows with regard to meaning that the punch moulding section is thin, so just makes the flexible distortion of punch or fracture.So the plastic deformation field is defined as the limit that punch lost efficacy with H/D 〉=2.5, i.e. H/D 〉=2.5, die life is extremely low, then can not process this type of deep hole with the plastic forming method of routine.Yet this deep hole internal spline class part if adopt the method processing of machining, still exist cutter intensity difference, the life-span is low, cost is high problem, and the size homogeneity of product is bad, and production efficiency is low, the waste raw material.Therefore, we pioneer and invent, try every possible means to break the normal procedure---punch structure yielding or fracture is designed to two parts of split: top can be identical with conventional punch, the bottom then is the external splines core bar, thereby make that deep hole internal spline can extrusion modling, in the service life of having improved punch effectively, be convenient to the processing and the replacing of punch simultaneously again, saved high mold materials widely, the economic benefit highly significant.

Summary of the invention

The purpose of this utility model provides a kind of deep hole internal spline precise forming mold that is used for the extrusion deep hole internal spline at existing weak point in the above-mentioned prior art just.

The purpose of this utility model can be achieved through the following technical solutions:

Deep hole internal spline precise forming mold of the present utility model comprise at least one put combined heave die and with at least one cover that it matches under combined die and the workpiece ejecting mechanism that equates with following combined die quantity, the described combined heave die of going up comprises the punch fixed cover that is fixed on the cope match-plate pattern bottom surface, is installed in the punch that punch case in the punch fixed cover, its upper end mode by interference fit combines with punch case by the punch retainer plate, and the mode that cooperates with contact is arranged on the spline core bar below the punch; Described down combined die and workpiece ejecting mechanism are fixedly mounted on the centre bore top of lower bolster by the die tube, and wherein the workpiece ejecting mechanism comprises and the cushion block of long push rod is installed in its central shaft hole in the centre bore that is placed on lower bolster, is placed in the backing plate that is provided with ejection ring in cushion block that push rod is installed in the interior central shaft hole of die tube and the central shaft hole successively from the bottom to top; Following combined die comprises by the pyramidal structure that cooperatively interacts and is sleeved on die together, middle die, die overcoat that following combined die is packed in by the die tight loop and is positioned at backing plate top die tube.

The utility model is provided with upper padding plate between punch upper surface and cope match-plate pattern bottom surface; The central shaft hole that processes on the described cushion block be shaped as the hole shape that matches with the long push rod of T font structure; The described combined heave die of going up is to be made of last combined heave die and following combined die that the quadruplet that is distributed on cope match-plate pattern, the lower bolster cooperatively interacts with following combined die, once can squeeze out four deep hole internal spline workpiece simultaneously.

Punch described in the utility model and spline core bar are splits, and the spline core bar is pressed in the blanking inner hole for preparing in advance.

Operation sequence: earlier with certain pressing piezometric altogether, pack in 20 19 then, with 21 punch is fixed on the cope match-plate pattern 16 at last with punch 18 and punch case 17; After being pressed in 1 with 2 again with 12 interference fits, constitute combined die, respectively 9,6 cushion blocks are put into lower bolster 8 and mould tube 10 then, ejection ring 11 is put into 7 endoporus, combined die is put into mould tube 10, with 13 whole die is fixed on the mould tube 10 at last, mould tube 10 is fixed on the lower bolster 8.

Core bar 14 is pressed in the blanking inner hole for preparing, then blank is put into die, punch 18 is along with the descending contact blank of guide pillar guide pin bushing 15, force metal flow to produce distortion, when extrusion 3 meets the requirements, press stops descending and backhaul, and following liftout attachment action ejects extrusion 3 by long push rod 5, push rod 4.So move in circles and promptly can produce deep hole internal spline class part in enormous quantities.

The utility model has following advantage: this mould is suitable for the precise cold extrusion modling of deep hole (H/D 〉=2.5) internal spline.Because such internal spline hole depth and big footpath are little, if adopt traditional punch structure, then the ratio of height to diameter of punch is just bigger even exceed the deformation limit of punch, makes the flexible distortion of punch or fracture, and the punch life-span, extremely low plan maybe can not be used the method moulding internal spline that pushes.Yet such deep hole internal spline promptly uses mach method also to be difficult to moulding, because exist cutter intensity difference, low problem of life-span equally.We then are designed to punch structure two parts separately: top can be identical with conventional punch, the bottom then is the external splines core bar, it is free moving type, so just make the processing of punch manufacture very facility, and the bottom spline can be with line cutting or hobbing method processing, can guarantee that machining accuracy can save the punch material again greatly.In addition, in the action of the one stroke of press, can also utilize the long-pending punch in a heavy in section and realize the precise forming of a plurality of internal spline parts of a plurality of core bars, production efficiency is high especially.If problems such as wearing and tearing, distortion appear in the spline core bar, only need to change the spline core bar and get final product, can not influence the use of top punch, very convenient, practical.This mould structure can also promote the use of on the precise forming of deep-hole type parts.

Description of drawings

Fig. 1 is that structure of the present utility model is shown.

Fig. 2 is that second kind of the utility model is the structural representation (being the A-A cutaway view of Fig. 3) of scheme.

Fig. 3 is the upward view of Fig. 2.

Fig. 4 is that of the present utility model the third is the structural representation (being the B-B cutaway view of Fig. 5) of scheme.

Fig. 5 is the upward view of Fig. 4.

Sequence number 1 is middle die among the figure, the 2nd, and die, the 3rd, extrusion, the 4th, push rod, the 5th, long push rod, the 6th, cushion block, the 7th, backing plate, the 8th, lower bolster, the 9th, cushion block, the 10th, die tube, the 11st, ejection ring, the 12nd, die overcoat, the 13rd, die tight loop, the 14th, spline core bar, the 15th, guide pillar guide pin bushing, the 16th, cope match-plate pattern, the 17th, punch case, the 18th, punch, the 19th, upper padding plate, the 20th, punch fixed cover, the 21st, punch tight loop.

The specific embodiment

This practicality newly is further described below with reference to embodiment (accompanying drawing):

Embodiment 1

As shown in Figure 1, deep hole internal spline precise forming mold of the present utility model comprises that one puts combined heave die and a cover and its following combined die of a cover that matches and the workpiece ejecting mechanism that equates with following combined die quantity, the described combined heave die of going up comprises the punch fixed cover 20 that is fixed on cope match-plate pattern 16 bottom surfaces, is installed in the punch 18 that punch case 17 in the punch fixed cover 20, its upper end mode by interference fit combines with punch case 17 by punch retainer plate 21, is arranged on the spline core bar 14 of punch 18 belows in the mode of contact cooperation; Described combined die down and workpiece ejecting mechanism are fixedly mounted on the centre bore top of lower bolster 8 by die tube 10, wherein the workpiece ejecting mechanism comprises cushion block 9 in the centre bore that is placed on lower bolster 8, is placed in cushion block 6 and backing plate 7 in the die tube 10 successively from the bottom to top, in the central shaft hole of cushion block 9, be provided with long push rod 5, in the central shaft hole of cushion block 6, be provided with push rod 4, in backing plate 7 central shaft holes, be provided with ejection ring 11; Following combined die comprises by the pyramidal structure that cooperatively interacts and is sleeved on together die 2, middle die 1, die overcoat 12 that following combined die is packed in by die tight loop 13 and is positioned at backing plate 7 top die tubes 10.Between punch 18 upper surfaces and cope match-plate pattern 16 bottom surfaces, be provided with upper padding plate 19.The central shaft hole that processes on the cushion block 9 be shaped as the hole shape that matches with the long push rod 5 of T font structure.

Embodiment 2

As Fig. 2, shown in Figure 3,1 difference of present embodiment and embodiment is: the described combined heave die of going up is to be made of last combined heave die and following combined die that the quadruplet that is distributed on cope match-plate pattern 16, the lower bolster 8 cooperatively interacts with following combined die; And its aligning method adopts the uniform mode of four point symmetries.

Embodiment 3

As Fig. 4, shown in Figure 5,1 difference of present embodiment and embodiment is: the described combined heave die of going up is to be made of last combined heave die and following combined die that the quadruplet that is distributed on cope match-plate pattern 16, the lower bolster 8 cooperatively interacts with following combined die; And its aligning method adopts single uniform mode.

Its concrete assembling mode is as follows: earlier with punch 18 and punch case 17 with certain pressing piezometric altogether, pack in 20 19 then, with 21 punch is fixed on the cope match-plate pattern 16 at last; After being pressed in 1 with 2 again with 12 interference fits, constitute combined die, respectively 9,6 cushion blocks are put into lower bolster 8 and mould tube 10 then, ejection ring 11 is put into 7 endoporus, combined die is put into mould tube 10, with 13 whole die is fixed on the mould tube 10 at last, mould tube 10 is fixed on the lower bolster 8.

Core bar 14 is pressed in the blanking inner hole for preparing, then blank is put into die, punch 18 is along with the descending contact blank of guide pillar guide pin bushing 15, force metal flow to produce distortion, when extrusion 3 meets the requirements, press stops descending and backhaul, and following liftout attachment action ejects extrusion 3 by long knock-pin 5, push rod 4.So move in circles and promptly can produce deep hole internal spline class part in enormous quantities.

In addition, in the action of the one stroke of press, can also utilize the long-pending punch in a heavy in section and realize the precise forming of a plurality of internal spline parts of a plurality of core bars, production efficiency is high especially.If problems such as wearing and tearing, distortion appear in the spline core bar, only need to change the spline core bar and get final product, can not influence the top punch, very convenient, practical.This mould structure can also promote the use of on the precise forming of deep-hole type parts.

Claims

1. deep hole internal spline precise forming mold, it comprises combined die under at least one at least one cover that puts combined heave die and match with it, and the workpiece ejecting mechanism that equates with following combined die quantity, it is characterized in that: the described combined heave die of going up comprises the punch fixed cover (20) that is fixed on cope match-plate pattern (16) bottom surface, be installed in the interior punch case (17) of punch fixed cover (20) by punch retainer plate (21), the punch (18) that its upper end mode by interference fit combines with punch case (17) is arranged on spline core bar (14) below the punch (18) in the mode of contact cooperation; Described combined die down and workpiece ejecting mechanism are fixedly mounted on the centre bore top of lower bolster (8) by die tube (10), wherein the workpiece ejecting mechanism comprises cushion block (9) in the centre bore that is placed on lower bolster (8), is placed in cushion block (6) and backing plate (7) in the die tube (10) successively from the bottom to top, in the central shaft hole of cushion block (9), be provided with long push rod (5), in the central shaft hole of cushion block (6), be provided with push rod (4), in backing plate (7) central shaft hole, be provided with ejection ring (11); Following combined die comprises by the pyramidal structure that cooperatively interacts and is sleeved on die (2) together, middle die (1), die overcoat (12) that following combined die is packed in by die tight loop (13) and is positioned at backing plate (7) top die tube (10).

2. deep hole internal spline precise forming mold according to claim 1 is characterized in that: be provided with upper padding plate (19) between punch (18) upper surface and cope match-plate pattern (16) bottom surface.

3. deep hole internal spline precise forming mold according to claim 1 is characterized in that: the central shaft hole that processes on the cushion block (9) be shaped as the hole shape that matches with the long push rod (5) of T font structure.

4. deep hole internal spline precise forming mold according to claim 1 is characterized in that: the described combined heave die of going up is to be made of last combined heave die and following combined die that the quadruplet that is distributed on cope match-plate pattern (16), the lower bolster (8) cooperatively interacts with following combined die.