CN105268756A - Die for pre-forming inner holes of deep-hole shaft parts, method for forming inner holes and forming process of deep-hole shaft parts - Google Patents

Die for pre-forming inner holes of deep-hole shaft parts, method for forming inner holes and forming process of deep-hole shaft parts Download PDF

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Publication number
CN105268756A
CN105268756A CN201510608455.6A CN201510608455A CN105268756A CN 105268756 A CN105268756 A CN 105268756A CN 201510608455 A CN201510608455 A CN 201510608455A CN 105268756 A CN105268756 A CN 105268756A
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China
Prior art keywords
punch
endoporus
hole shaft
mould
drip molding
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CN201510608455.6A
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Chinese (zh)
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CN105268756B (en
Inventor
邱德花
钟志平
边翊
翟月雯
马晓晖
陈小辉
叶丽燕
田钰清
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Beijing Research Institute of Mechanical and Electrical Technology
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Priority to CN201510608455.6A priority Critical patent/CN105268756B/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C25/00Profiling tools for metal extruding
    • B21C25/02Dies
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00Extruding metal; Impact extrusion
    • B21C23/02Making uncoated products
    • B21C23/20Making uncoated products by backward extrusion

Abstract

The invention provides a die for pre-forming inner holes of deep-hole shaft parts, a method for forming inner holes and a forming process of the deep-hole shaft parts. The die comprises a male die body, a female die body and a male die sleeve arranged outside the male die body in a matched manner. A mold cavity is formed in the female die body. A step part connected with the bottom of an upset head of a forming piece of the deep-hole shaft parts in an abutting manner is formed in the part, located in the mold cavity, on the female die body. When the step that the inner holes are pre-formed through the die is finished, the end face of the bottom end of the male die body should be aligned with the plane part of the step part, and therefore it can be avoided that folding defects happen to the bottoms of flanges when the step that the flanges are formed is conducted, the folding phenomenon happening to the bottoms of the flanges of the deep-hole shaft parts can be avoided, and the forming effect of the deep-hole shaft parts can be ensured.

Description

The mould of preform deep hole shaft forgings endoporus, form the method for endoporus and the forming technology of deep hole shaft forgings
Technical field
The present invention relates to a kind of mould of preform deep hole shaft forgings endoporus, form the method for endoporus and the forming technology of deep hole shaft forgings.
Background technology
Gear-box axle like members is the core component of car transmissions, and China's car industry enters high-speed development period after the nineties in 20th century, and conventional production methods cannot meet market demands.Conduct a research for gearbox deep hole shaft forgings forming technology herein.As shown in Figure 1, the characteristic feature of such part is that bar portion is elongated, head has flange and inside has blind hole.The main method of current such part of domestic production is cold-extruded depression bar portion-upsetting squeeze flange-machined blind hole.But machined blind hole can cut off metal streamline, reduce properties of product and stock utilization.If blind hole is once-forming by backward extrusion, then forming technology is: cold-extruded depression bar portion-heading-backward extrusion endoporus-upsetting flange closes up.In this kind of technique, during backward extrusion endoporus, a Rouno Cormer Pregrinding Wheel can be formed bottom head, in upsetting flange closing in work step, form metal folding.
Summary of the invention
Main purpose of the present invention is to provide a kind of mould of preform deep hole shaft forgings endoporus, form the method for endoporus and the forming technology of deep hole shaft forgings, the flange base of deep hole shaft forgings can be avoided to occur Fold, and then guarantee the forming effect of deep hole shaft forgings.
The present invention proposes a kind of mould of preform deep hole shaft forgings endoporus, comprise punch, die and the supporting punch case be arranged on outside described punch, described die is provided with die cavity, the stage portion that described die abuts against bottom the heading of formation one for the drip molding with described deep hole shaft forgings in described die cavity, at the end of utilizing described mould preform endoporus work step, described punch bottom end face should be concordant with the planar portions of described stage portion.
Adopt said structure, at the end of utilizing described mould preform endoporus work step, described punch bottom end face should be concordant with the planar portions of described stage portion, namely when described punch lower surface flushes with the planar portions of described stage portion, described punch stops moving down, make preform bore depth equal with drip molding heading height, thus when avoiding shaping flange work step, there is fold defect in flange base, and then the flange base of deep hole shaft forgings can be avoided to occur Fold, to guarantee the forming effect of deep hole shaft forgings.
Preferably, described punch case has first step, second step, the 3rd step that diameter from top to bottom successively decreases successively, punch case planar portions of the present invention is formed by the 3rd step plane portion of the 3rd step, at the end of utilizing described mould preform endoporus work step, described punch bottom end face should be equal with the distance between the planar portions of described stage portion and described punch case planar portions relative to the extension elongation of described punch case planar portions.
Preferably, described mould also comprises the convex mould pad, punch retainer and the pressure ring that are connected in turn from top to bottom, and described pressure ring moves along described punch case on matched moulds/die sinking direction.
Preferably, the spring of back pressure required when being furnished with between described punch case and described punch retainer to provide preform endoporus.
The invention allows for a kind of method forming endoporus on the drip molding of deep hole shaft forgings, comprise aforementioned in arbitrary described mould, at the end of utilizing described mould preform endoporus work step, described punch bottom end face should be concordant with the planar portions of described stage portion.
Adopt said method, at the end of utilizing described mould preform endoporus work step, described punch bottom end face should be concordant with the planar portions of described stage portion, namely when described punch lower surface flushes with the planar portions of described stage portion, described punch stops moving down, make preform bore depth equal with drip molding heading height, thus when avoiding shaping flange work step, there is fold defect in flange base, and then the flange base of deep hole shaft forgings can be avoided to occur Fold, to guarantee the forming effect of deep hole shaft forgings.
The invention allows for a kind of forming technology of deep hole shaft forgings, comprising:
Step 1, carries out a diameter reducing extrusion process to the shaped bar parts of deep hole shaft forgings;
Step 2, carries out the process of secondary diameter reducing extrusion to the drip molding that step 1 is formed;
Step 3, carries out upsetting squeeze to form heading at the top of this drip molding to the drip molding that step 2 is formed;
Step 4, the drip molding formed step 3 is once counter squeezes endoporus process;
Step 5, the drip molding formed step 4 carries out secondary counter and squeezes endoporus process;
Step 6, carries out upsetting squeeze flange reducing process to the drip molding that step 5 is formed;
Wherein, at the end of step 4 backward extrusion preform endoporus work step, described punch bottom end face should be concordant with the planar portions of described stage portion.
Adopt above-mentioned technique, can avoid forming metal folding phenomenon on the middle drip molding or finished parts of deep hole shaft forgings, smooth bottom the heading guaranteeing deep hole shaft forgings.Meanwhile, continuous print metal streamline can also be obtained, to guarantee the forming effect of deep hole shaft forgings, and increase substantially stock utilization.
Accompanying drawing explanation
Fig. 1 is the structural representation of deep hole shaft forgings;
Fig. 2 is the forming technology general flow chart of the shaft forgings of deep hole shown in Fig. 1;
Fig. 3 is the structural representation of the mould of preform deep hole shaft forgings endoporus, and wherein, mould is in matched moulds state;
Fig. 4 is the structural representation of the mould of preform deep hole shaft forgings endoporus, and wherein, mould is in compact making hole state;
Fig. 5 is the punch case of mould and the structural representation of die;
Fig. 6 is for punch bottom face is higher than the material flow schematic diagram corresponding to stage portion planar portions;
Fig. 7 is for punch bottom face is higher than the metal folding phenomenon caused during stage portion planar portions;
Fig. 8 is for punch bottom face is lower than the material flow schematic diagram corresponding to stage portion planar portions;
Fig. 9 is for punch bottom face is lower than the metal streamline schematic diagram corresponding to stage portion planar portions;
Figure 10 is that punch bottom face flushes corresponding metal streamline schematic diagram with stage portion planar portions.
Detailed description of the invention
Referring to Fig. 1 ~ Figure 10 to the mould of preform deep hole shaft forgings endoporus of the present invention, form the method for endoporus and the forming technology of deep hole shaft forgings is described in detail.
As shown in Figure 1, deep hole shaft forgings 1 has elongated bar portion 11 usually, has flange 12 at the head in this bar portion 11, has blind hole 13 in the head inside in bar portion 11, and the top of this blind hole 13 is closing in shape.In the present invention, deep hole shaft forgings 1 mainly adopts technological process shown in Fig. 2 to be shaped, and with reference to shown in Fig. 2, the forming technology of deep hole shaft forgings mainly comprises the steps:
Step 1, carries out a diameter reducing extrusion process to the shaped bar parts of deep hole shaft forgings, forms the drip molding shown in Fig. 2 (a);
Step 2, carries out the process of secondary diameter reducing extrusion to the drip molding shown in Fig. 2 (a), forms the drip molding shown in Fig. 2 (b);
Step 3, carries out upsetting squeeze to form heading on the top of drip molding to the drip molding shown in Fig. 2 (b), finally forms the drip molding shown in Fig. 2 (c);
Step 4, squeezes endoporus process to the drip molding shown in Fig. 2 (c) is once counter, forms the drip molding shown in Fig. 2 (d);
Step 5, carries out secondary counter to the drip molding shown in Fig. 2 (d) and squeezes endoporus process, forms the drip molding shown in Fig. 2 (e);
Step 6, carries out upsetting squeeze flange reducing process to the drip molding shown in Fig. 2 (e), forms the drip molding shown in Fig. 2 (f), that is the finished parts of deep hole shaft forgings.
Main improvements of the present invention are, mould shown in employing Fig. 3 ~ Fig. 5 realizes the once anti-crowded endoporus treatment process in step 4.As shown in Fig. 3 ~ Fig. 5, the punch assemblies of shown mould comprises the convex mould pad 21, punch retainer 22 and the pressure ring 23 that are connected in turn from top to bottom, pressure ring 23 overall U-shaped, its top is fixed on by securing members such as screws on the lower surface of punch retainer 22, is provided with a stepped hole 231 in the bottom of pressure ring 23.The lower surface of punch retainer 22 is provided with a punch case 24 inside pressure ring 23, between the top of this punch case 24 and punch retainer 22, is provided with spring 25, back pressure required when this spring 25 is in order to provide preform endoporus.The lower surface of convex mould pad 21 is provided with punch 26 inside pressure ring 23, and this punch 26 is overall T-shaped Step Shaft, and it is fixed on convex mould pad 21 by punch retainer 22.
As shown in Fig. 3 ~ Fig. 5, punch case 24 has three grades of steps, largest diameter be first step 241, what diameter was less is second step 242, what diameter was minimum is the 3rd step 243, second step 242 has second step facade portion 242a and second step planar portions 242b, and the 3rd step 243 has the 3rd step facade portion 243a and the 3rd step plane portion 243b, forms punch case planar portions of the present invention by the 3rd step plane portion 243b.The top of punch 26 and the lower surface of convex mould pad 21 abut against, and its vertical portion axially runs through punch retainer 22, spring 25, punch case 24 from top to bottom successively, and the bottom of punch 26 can be stretched out from the bottom of punch case 24.Punch assemblies is arranged on to provide on the press ram of plastic force usually, and during mould matched moulds/die sinking, convex mould pad 21, punch retainer 22, pressure ring 23 and punch 26 keep synchronizing moving, and pressure ring 23 moves along punch case 24.In the present invention, punch 26 is in order to extrude drip molding Fig. 2 (c) Suo Shi to form the endoporus on drip molding shown in Fig. 2 (d), therefore the bottom end face of punch 26 is plane.
Die assembly is generally fixed on the work top of forcing press, as shown in Fig. 3 ~ Fig. 5, and the die circle stress 32 that die assembly comprises the die 31 opposite with punch 26 and punch case 24 and is arranged on outside this die 31.Die 31 is provided with the die cavity 311 corresponding with the shape of drip molding Fig. 2 (d) Suo Shi, utilize mould shown in Fig. 3 and Fig. 4 once anti-when squeezing endoporus treatment process, the lower end of punch 26 enters die cavity top and extrudes the drip molding shown in Fig. 2 (c), to form the drip molding shown in Fig. 2 (d).Die 31 forms a stage portion 312 near top in die cavity 311, corresponding bottom the heading of drip molding shown in planar portions 312a and Fig. 2 (d) of this stage portion 312, and this planar portions 312a is equal with the width of the heading of drip molding Fig. 2 (d) Suo Shi perpendicular to the length on die cavity axial direction.
Below to utilize mould shown in Fig. 3 ~ Fig. 5 once counter squeeze endoporus treatment process time, the operation principle of this mould describes simply.
Shown in Fig. 2 (c), drip molding is placed in the die cavity 311 of mould shown in Fig. 3, punch assemblies descending under press ram effect (namely moving to matched moulds direction), until the end face of drip molding shown in the end face of drip molding, the lower surface of punch 26 and Fig. 2 (c) abuts against respectively shown in the upper surface of the second step planar portions 242b of punch case 24 and die 31, the 3rd step plane portion 243b and Fig. 2 (c), then punch case 24 arrives die-closed position;
Punch assemblies continues descending under press ram drives, in this moving process, punch retainer 22 Compress Spring 25 makes punch case 24 be connected on die 31 further, convex mould pad 21, punch retainer 22, pressure ring 23 and punch 26 continue descending, drip molding shown in punch 26 couples of Fig. 2 (c) is then driven to extrude to form endoporus, when punch bottom end face flushes with the planar portions 312a of die stage portion, backward extrusion preform endoporus completes.
After backward extrusion preform endoporus completes, forcing press drives the assemblies up (namely moving along stripping direction) such as convex mould pad 21, punch retainer 22, pressure ring 23 and punch 26, punch 26 is departed from from the endoporus of profiled member Fig. 2 (d) Suo Shi, realize the process of loosing core of mould thus, loose core in process aforementioned, due under the effect of spring 25, punch case is temporarily motionless.
Forcing press continues to drive whole punch assemblies up (namely moving towards stripping direction), after pressure ring 23 contacts with the flange (being made up of first step 241) of punch case 24, punch case 24 moves with punch assemblies, arrive press ram top dead-centre, complete whole backward extrusion preform endoporus process thus.
In the present invention, because the structure of mould meets following condition: when utilizing mould, Fig. 2 (c) Suo Shi, drip molding forms endoporus, punch bottom end face should be concordant in the planar portions at die stage portion place, ensure that preform bore depth is equal with the height in drip molding heading portion thus, thus when avoiding shaping flange work step there is fold defect in flange base, is conducive to the forming effect guaranteeing deep hole shaft forgings.In addition, compared with cold extrusion, adopt the diameter reducing extrusion technological process shown in Fig. 2, can deflection be reduced, reduce plastic force, simplify mould structure.
If punch bottom end face is higher than stage portion planar portions 312a, in backward extrusion endoporus work step, as shown in Figure 6, under mould action, the speed that outside drip molding heading, metal upwards flows is greater than the flow velocity of its inner metal, the fillet that easily formation one is large bottom the heading of drip molding, causes the out-of-flatness of heading bottom shape.After backward extrusion endoporus work step terminates, the drip molding of deep hole shaft forgings moves to upsetting squeeze flange reducing work step when processing, due to the existence of Rouno Cormer Pregrinding Wheel bottom the heading shown in Fig. 6, under mould action, the part metals at heading circular arc place outwardly, part metals flows downward, and causes the metal folding phenomenon formed bottom heading shown in Fig. 7.
If punch bottom end face is lower than stage portion planar portions 312a, in backward extrusion endoporus work step, under mould action, metal flow as shown in Figure 8, then male bottom metal upwards flows downwards, finally outwardly fill die, make material flow difficulties, when causing compact making hole, required plastic force is larger, simultaneously, bottom heading, easily form metal folding as shown in Figure 9, and male bottom is more lower than stage portion planar portions 312a, easier formation bottom heading folds.
Metal streamline schematic diagram corresponding when Figure 10 shows that punch bottom end face flushes with stage portion planar portions 312a, can obviously draw from Figure 10, in backward extrusion endoporus work step, under mould action, compares shown in Fig. 7 and Fig. 9 obviously smooth bottom heading.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (6)

1. the mould of a preform deep hole shaft forgings endoporus, comprise punch, die and the supporting punch case be arranged on outside described punch, described die is provided with die cavity, the stage portion that described die abuts against bottom the heading of formation one for the drip molding with described deep hole shaft forgings in described die cavity, it is characterized in that, at the end of utilizing described mould preform endoporus work step, described punch bottom end face should be concordant with the planar portions of described stage portion.
2. mould according to claim 1, is characterized in that, described punch case has first step, second step, the 3rd step that diameter from top to bottom successively decreases successively, forms punch case planar portions of the present invention by the 3rd step plane portion of the 3rd step,
At the end of utilizing described mould preform endoporus work step, described punch bottom end face should be equal with the distance between the planar portions of described stage portion and described punch case planar portions relative to the extension elongation of described punch case planar portions.
3. mould according to claim 1, is characterized in that, described mould also comprises the convex mould pad, punch retainer and the pressure ring that are connected in turn from top to bottom, and described pressure ring moves along described punch case on matched moulds/die sinking direction.
4. mould according to claim 3, is characterized in that, the spring of back pressure required when being furnished with between described punch case and fixed head to provide preform endoporus.
5. on the drip molding of deep hole shaft forgings, form a method for endoporus, it is characterized in that, comprise arbitrary described mould in Claims 1 to 4,
At the end of utilizing described mould preform endoporus work step, described punch bottom end face should be concordant with the planar portions of described stage portion.
6. a forming technology for deep hole shaft forgings, is characterized in that, comprising:
Step 1, carries out a diameter reducing extrusion process to the shaped bar parts of deep hole shaft forgings;
Step 2, carries out the process of secondary diameter reducing extrusion to the drip molding that step 1 is formed;
Step 3, carries out jumping-up to form heading at the top of this drip molding to the drip molding that step 2 is formed;
Step 4, the drip molding formed step 3 is once counter squeezes endoporus process;
Step 5, the drip molding formed step 4 carries out secondary counter and squeezes endoporus process;
Step 6, carries out upsetting squeeze flange reducing process to the drip molding that step 5 is formed;
Wherein, at the end of step 4 backward extrusion preform endoporus work step, described punch bottom end face should be concordant with the planar portions of described stage portion.
CN201510608455.6A 2015-09-22 2015-09-22 Die for pre-forming inner holes of deep-hole shaft parts, method for forming inner holes and forming process of deep-hole shaft parts Expired - Fee Related CN105268756B (en)

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CN106238486A (en) * 2016-08-17 2016-12-21 中国兵器工业第五九研究所 A kind of slender member revolving die backward extrusion carefully brilliant shaping dies and manufacturing process
CN106862290A (en) * 2017-02-24 2017-06-20 中北大学 A kind of cup shell backward extrusion forming device and manufacturing process
CN107336463A (en) * 2017-08-28 2017-11-10 陈志妹 A kind of new crowded mouth mold tool
CN108838226A (en) * 2018-07-13 2018-11-20 中国航发北京航空材料研究院 One kind being used for the hot backward extrusion method of titanium alloy cup shell
CN108941232A (en) * 2018-07-09 2018-12-07 中国兵器工业第五九研究所 A kind of casted die mould
CN111014455A (en) * 2019-11-29 2020-04-17 浙江海亮股份有限公司 Cold punching and drawing die
CN111069414A (en) * 2019-12-26 2020-04-28 顺科新能源技术股份有限公司 Part punching device and method
CN113020512A (en) * 2021-03-19 2021-06-25 盐城中德精锻股份有限公司 Composite forming process and device for thin-wall deep-hole barrel precision forging

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Publication number Priority date Publication date Assignee Title
CN106238486A (en) * 2016-08-17 2016-12-21 中国兵器工业第五九研究所 A kind of slender member revolving die backward extrusion carefully brilliant shaping dies and manufacturing process
CN106862290A (en) * 2017-02-24 2017-06-20 中北大学 A kind of cup shell backward extrusion forming device and manufacturing process
CN107336463A (en) * 2017-08-28 2017-11-10 陈志妹 A kind of new crowded mouth mold tool
CN108941232A (en) * 2018-07-09 2018-12-07 中国兵器工业第五九研究所 A kind of casted die mould
CN108941232B (en) * 2018-07-09 2019-11-19 中国兵器工业第五九研究所 A kind of casted die mould
CN108838226A (en) * 2018-07-13 2018-11-20 中国航发北京航空材料研究院 One kind being used for the hot backward extrusion method of titanium alloy cup shell
CN111014455A (en) * 2019-11-29 2020-04-17 浙江海亮股份有限公司 Cold punching and drawing die
CN111014455B (en) * 2019-11-29 2022-01-25 浙江海亮股份有限公司 Cold punching and drawing die
CN111069414A (en) * 2019-12-26 2020-04-28 顺科新能源技术股份有限公司 Part punching device and method
CN113020512A (en) * 2021-03-19 2021-06-25 盐城中德精锻股份有限公司 Composite forming process and device for thin-wall deep-hole barrel precision forging
CN113020512B (en) * 2021-03-19 2021-11-19 盐城中德精锻股份有限公司 Composite forming process and device for thin-wall deep-hole barrel precision forging

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